Current Status and Progress of Gold Mineral Processing Technology

As is well known, gold deposits are usually divided into sand gold and pulse gold . The gold deposit contains 2~0.3 g/m3 gold, and the gold deposit contains 5 g/t. Due to the high value of gold, both have mining value. Gold is often recycled by re-election. Pulse more types of gold, in our currently divided into four categories: quartz vein gold, pyrite gold, gold Ore-containing mineral special gold (such as gold, uranium, tungsten, gold and antimony belonging to This class). In recent years, with the development and utilization of mineral resources, limited mineral resources are depleted, easy dressing stone fewer and fewer people have to exploit low-grade, finely divided, refractory ore. Conventional processes and pharmaceuticals have not been able to obtain better screening indicators. In order to solve this problem, the majority of mineral processing workers have invested a lot of efforts in researching new technologies, new chemicals and equipment for gold mining, and have made great progress. Further exploration of them has become one of the main research directions of mineral processing workers.

1 new progress in gold re-election equipment

Gravity beneficiation is very common in gold beneficiation. The re-election is based on the density difference of the minerals. According to reports, the current gold production by re-election method accounts for between 12% and 15% of global production. Not only sand gold beneficiation continues to be dominated by re-election, but also about 30% of the total gold production in the capital mines is obtained by gravity beneficiation.

In recent years, the re-election of new equipment has developed rapidly, such as online pressure jigs, Nichols jigs, automatic shakers, Falcon concentrators and Nielsen concentrators. The most representative of these is the Knelson concentrator, which was developed by Lee Mar Industries of Canada and has been adopted by many foreign gold selection plants. The Nielsen concentrator mainly utilizes the principle of interference settlement in a centrifugal force field, consisting of a high-speed rib cone and a transmission. The EI Bajo Cauca and EI Bagre mines in Fatico, Colombia, use the Nielsen concentrator to treat alluvial sands to recover fine gold. The results show that the Nielsen concentrator is an effective device and is especially suitable for recovering fine-grained gold that is lost during operation with other re-election equipment .

The ore processing capacity of the Campbell Gold Mine Concentrator is 1360 t / d. The ore grade of the ore dressing plant is relatively high. Prior to 1994, re-election was carried out using a circuit consisting of an ordinary jig and a shaker, and the jigging concentrate was selected on a shaker to produce a concentrate that could be refined into gold ingots. In May 1994, two <76 cm centrally mined Nielsen concentrators were purchased to replace the existing jigs, resulting in a 16% increase in gold re-election recovery. The recovery rate of reselection with a jig is between 30% and 35% on average. Due to the installation of the Nielsen concentrator, not only does the re-election rate increase to around 50%, but it also saves labor and reduces costs. After the Nielsen gravity concentrator was used in Australia's StIves gold mine, it also achieved good indicators.

The Lenin Nogorsk concentrator in Russia introduced a type 30 Nielsen centrifugal sorter to sort gold from low-sulphide ore flotation concentrates. The results show that the machine can recover the associated gold and fine-grained grade 8~44μm free gold from the flotation product to obtain the crude concentrate with gold content of 100~200g/t.

The Daliuhang Gold Mine Concentrator uses a re-election-flotation process with a total gold recovery of 91%. However, due to the influence of grinding fineness and flotation time, the gold grade of tailings is high, with an average of 0.34 g / t, which has certain recovery value. Su Huimin, Jiang Renshe, etc. in the process of testing the process of recovering gold, silver and sulfur from gold mine tailings, adopting new patented equipment))) Continuously arranging centrifugal concentrator as a roughing equipment in combination with a shaker, which can effectively recover fine Granular minerals, and can simplify the process, achieve full-grain selection, large processing capacity, high recovery rate, and significant economic benefits.

The Duwensk Natural Resources Comprehensive Utilization Institute of the Siberian Branch of the Russian Academy of Sciences has developed a new re-election process for the treatment of gold-bearing ores and tailings. The process consists of a washing tank, a hydraulic screen, a mechanical trough, and a hydrocyclone. The system recovers gold from old tailings. The recovery rate of the new process equipment gold is 15% to 20% higher than that of the conventional process, and the processing capacity of the system is 10 t/h.

The original “full mud cyanidation” process was changed to the “re-election + full mud cyanidation” process in the selection of the leaping and smelting technology of the Longtoushan Gold Mine. In the increased re-election operation, the water jacket centrifugal concentrator was used for industrial testing. Liu Yulei, Xie Qinghua, etc. have made a series of improvements in the continuous production of water jacketing machine, making it a wear-resistant fully enclosed re-election equipment, and used in industrial production, significantly improving the effect of recovering monomer gold, recovery rate Increase by 5.07%. The successful application of this process has certain promotion value.

The centrifugal spiral chute is a new equipment developed by Zhang Guifang and so on. It differs from the general spiral chute mainly in the tank coating material. The centrifugal spiral chute is not only affected by gravity and centrifugal force when it is sorted, but also subjected to various forces such as magnetic force, electric power, and intermolecular surface adsorption force. It is a multi-purpose force field action beneficiation equipment. The equipment used to carry out the rough selection and tailing test of a gold ore tailings, and achieved better test results than the general grooving equipment, the shrink chute, the spiral concentrator, and the like.

The sawtooth jig is a new type of jigging equipment based on the traditional jig, which can be used to recover coarse gold in the grinding and grading circuit. Liu Yaoqing and Zhong Yafei used 5/3% of the coarse gold in the Yuanyang gold mine to recover the gold recovery rate in the grinding-grading circuit. The recovery rate of gold was over 80%. The test also examined the effects of artificial bed thickness, stroke, punching, and additional water under the sieve on the beneficiation index. The results showed that the bed size, stroke, and stroke were adjusted according to the ore properties. A good sorting index can be obtained by adding parameters such as the amount of water.

2 New progress in gold sorting process

In order to comprehensively recover valuable elements such as gold and copper from polymetallic complex refractory gold ore, Luo Huihua and Luo Lianming used oxidation enhanced flotation process. In the case of raw ore Cu grade of 1.09% and Au grade of 3.92 g/t, aerated oxidation for 10 min can achieve better separation of copper and sulfur, obtain copper grade 15.11%, recovery rate 77.48% ~ 77.72%, gold 36.35 ~ 38.42 g / t, recovery of 59.00% ~ 62.35% of qualified copper concentrate.

Henan a sulfur-containing arsenic gold deposit, gold ore disseminated micro-fine particle size in the main, and the gold and pyrite and arsenopyrite closely. Li Yingguo and Cao Jincheng passed the beneficiation test and adopted the process of coarse grinding-mixing flotation-re-grinding-gold-sulfur separation. Finally, a gold concentrate with a yield of 12.42%, a gold grade of 55.20 g / t and an arsenic content of 1.68% was obtained. . The recovery rate of gold is 80.56%. The gold concentrate obtained by the test was subjected to metallurgical immersion gold test, and the leaching rate of gold was more than 95%. This process has a certain guiding role in the rational development and utilization of the mine.

Axi Gold Mine is a large-scale mining and selection joint enterprise. With the change of raw ore, the original whole mud cyanidation process has gradually been unable to meet the production requirements. Therefore, Huang Wei and Zhang Zhiyu conducted comparative experiments on three schemes of flotation-baking-cyanide, flotation concentrate-bacterial oxidation-cyanide and electrochemical pretreatment. The results show that the scheme 1 is mature, stable and reliable, but the process is long, continuous and stable operation is difficult, and environmental protection requirements are high. The second scheme is the emerging beneficiation process for resolving sulfide ore in recent years. The process index is advanced, environmental protection is easy to reach the standard, but the process investment cost is high and the operating cost is high. Scheme 3 is the patented technology of the Kazmihanolbu Mineral Processing Research and Design Institute in Kazakhstan. The hospital tested the two samples from the Axi Gold Mine. The leaching rate increased to 81% to 83% and the adsorption rate was 97.5. % , the recovery rate is 79.36% ~ 81.22%. However, considering the difficulty of the subsequent filter press operation, the re-election process is added before the pretreatment, and a part of the tailings is discarded as early as possible, thereby reducing the cost and difficulty of subsequent operations. It is finally determined that the re-election-pre-oxidation-cyanide process is adopted, which has low investment, low cost and good technical and economic indicators.

Wang Qinwu et al. studied and analyzed the two beneficiation processes of the gold-bearing polymetallic mixed ore in the Yangjishan gold deposit, and concluded that the copper preferential flotation-sulfur concentrate roasting cyanide-tailing full mud cyanidation process ratio The flotation-cyanide-flotation process has superior flow, and the total gold recovery rate is increased by 6.19 percentage points, which is economically more reasonable.

Li Fulan and Zou Zhixuan, etc., compared the characteristics of Liuhuazui gold-copper sulfide ore, and carried out a comparative experimental study on the combination of gold-copper-sulfur mixed flotation-mixed coarse concentrate re-grinding and mixed coarse concentrate no-grinding. Copper-sulfur mixed flotation - mixed coarse concentrate regrind process. At the same time, a large number of exploratory tests have been carried out on the addition types of collectors of gold and copper. The test results show that the capture foaming agent A2 combined with butyl xanthate has good selectivity to gold and copper and has strong collection ability. The copper grade of copper concentrate was 25.43% and the gold content was 21.89 g / t. The recovery rates of copper and gold were 97.65% and 97.44%, respectively.

In a large-scale symbiotic ore deposit, the arsenic ore deposit has coarse grain size and is easy to be muddy and easily oxidized. The gold mineral inlay has a relatively fine grain size. Huang Yunjie and Liu Shuping use this stage for grinding and stage selection. In the other re-election and flotation process, the gold ore mixed concentrate with a yield of 30.45%, a gold grade of 22.21 g/t and a tantalum grade of 55.22% was obtained. The recovery rates of gold and tantalum ore were 91.27% and 94.20%, respectively. Successfully solved the technical problems of the enrichment of gold and gold. The obtained gold strontium mixed concentrate was separated by MS leaching agent and separated by gold and hydrazine method, and good gold bismuth separation results were obtained. The leaching rate reached 98.56%, and the gold entering the sputum immersion liquid only accounted for 4.19%. The cerium immersion liquid and the leaching slag comprehensive recovery strontium and gold were studied respectively, and all the good experimental indexes were obtained.

The Tianmashan ore is a arsenic-containing high-sulfur refractory gold ore. Wang Yu et al. conducted a beneficiation process on the ore. The preferential flotation gold and bleaching powder were used as oxidant flotation to separate pyrite and arsenopyrite, and magnetic separation was used to separate the magnetic yellow. Iron ore and arsenotic technology, comprehensive recovery of gold, sulfur and arsenic, achieved better selection indicators. This process is more suitable for the nature of the Tianmashan gold arsenic sulfide ore and the actual production of the mine.

An arsenic-containing gold ore belongs to a gold-bearing polymetallic sulfide ore. It can only recover about 60% to 62% of natural gold by re-election method, and cannot comprehensively recover gold minerals and stibnite more effectively. Yu Xue and Li Yushuang used amalgamation -flotation and secondary selected tailings did not return to the system process, and used lead nitrate as an activator, sodium sulfite as an inhibitor of arsenic, and comprehensive recovery of gold ore. The test proves that the mineral processing technical index is good, and the arsenic content of the antimony concentrate meets the national requirements.

The Qibaoshan gold deposit is a low-grade polymetallic deposit containing gold, silver, copper and sulfur. The gold-copper mineral inlay has a fine grain size and is closely related to pyrite. The ore dressing plant has been in production for more than 20 years and has experienced three important process development stages, namely single gold flotation; gold and copper preferential flotation - tailings beneficiation - sulfur concentrate re-grinding; mixed flotation. The mixed flotation process adapts to the current requirements of the nature of the ore, can fully utilize the mine resources, improve product quality, and has significant economic and social benefits.

Zhang Yikui et al. determined the use of flotation-(tailing) re-election process to select the ore by conducting a trial study on the refractory metallurgical ore process of carbon, arsenic, antimony and sulfur fine particles in Wulonggou, Qinghai Province. Flotation obtained a gold concentrate with a gold content of 66.4 g / t and a recovery rate of 79.48%. The re-election obtained a gold grade of 22.88 g / t, the recovery rate accounted for 5.26% of the original ore re-election concentrate, and the two concentrates merged. Using this process, a good indicator of a gold grade of 58.17 g/t and a recovery rate of 84.74% was obtained. It provides an effective way for rational use of resources and improvement of mine economic benefits.

Flotation can not only pretreat refractory ore, but also obtain precious metal flotation concentrate. It is also a common process for recovering precious metals from the sulphide ore flotation circuit. D. Malhotra et al. reviewed the mineral processing practices and future development trends of precious metal concentrators. When the Chilean EI Indio Concentrator processes a gold-bearing ore, depending on the nature of the ore, the ore is washed prior to grinding to remove soluble acidic minerals. Two-stage flotation removes cyanide-consuming minerals, which reduces the consumption of cyanide during cyanidation of flotation tailings. A portion of the flotation concentrate (about 60%) is calcined to reduce the arsenic content of the concentrate to suit the smelting process.

An ore gold is produced by combining monomeric gold with pyrite and pyrrhotite. The ore contains Cu 0.263%, Au 3.6 g/t and Ag 3.9 g/t, and the ore contains graphite , which is very complicated. When the Schumacher D-ivision concentrator treats the mine, it first floats out the copper concentrate, then carries out the mixed mineral flotation of sulfide minerals, and re-grinds and cyanide leaching of the mixed concentrate containing pyrite, pyrrhotite and gold. The graphite capable of adsorbing gold is floated into the copper concentrate. Pre-inflation in the lime solution prior to leaching can overcome the refractory properties of pyrrhotite. The process has obtained a good selection index.

Zhang Yue et al. Through the analysis of the characteristics of the ore, flotation tailings, flotation concentrate and flotation concentrate leaching of the Tuanjiegou gold mine, the flotation concentrate leaching is controlled by chute re-election for industrial production, chute re-election. The concentrate is extracted by calcination-CIL carbon leaching method or microbial oxidation method, and the tailings are re-elected and re-flotted; flotation concentrate concentrate roasting, calcination CIL carbon leaching method for gold extraction is introduced, it is recommended to use re-election method to recover float The fine-grained natural gold and pyrite in the tailings are added to the gold in the continuous body of pyrite and gangue minerals to improve the total ore recovery rate of the Tuanjiegou gold mine.

In order to improve the beneficiation process of the Xiadian gold ore dressing plant, the ore dressing recovery rate and gold concentrate grade of fine-grained gold ore are improved. Wang Peifu and Cui Xueqi used the medium-mine back-re-grinding process to increase the gold ore recovery rate from 93.71% to 96.74%, and the gold concentrate grade from 43.81 g/t to 60.38 g/t. More than 322 million yuan, significant economic benefits.

Laizhou Jincang Mining Co., Ltd. Cangshang Gold Mine Concentrator re-grinds the continuous particles in the flotation process by adding the re-grinding operation in the grinding and floating system, and optimizes the regrind process to make gold The grade of concentrate is increased by 5~10 g / t, the grade of tailings is stable at 0.11g/t, the enrichment ratio is increased from 11 to 16, and the amount of grinding treatment is appropriately increased. The annual economic benefits generated are 1.1 million yuan and 1262.

Wang Shaodong and others introduced the research results of the gold extraction process of mixed gold ore in the Zhenyu gold mine. The main reason for the difficulty of the ore is that the gold inlay has a very fine particle size. Except for about 60% of the exposed natural gold, the other is sulfide mineral coated gold and dense oxidized mineral coated gold. It is difficult to obtain good smelting indicators by a single beneficiation or cyanide leaching process. In this experiment, the principle of flotation-cyanide leaching (resin adsorption)-re-election was used to extract the gold process, and the total gold recovery rate was 83.12%.

The Wula gold ore in Heilongjiang Province is a typical refractory ore in China. In response to the nature of the ore, the Beijing Research Institute of Mining and Metallurgy cooperated with field technicians to conduct experimental research on electrochemical controlled flotation and made breakthrough progress. The technology was applied to the production practice and obtained a good index of concentrate grade of 56.67 g / t and gold recovery of 90.18%, which was 19.47 g / t and 3.38 percentage points higher than the original production index. The experimental results show that electrochemical flotation has in-depth research and popularization and application value for refractory metallurgical ore.

A silver ore ore has more useful metals and is closely related to each other. Mainly silver dispersed isomorphous presence of various excipients and jarosite type sulfide minerals, manganese oxide minerals. It is difficult to select by conventional beneficiation methods. Yang Yuzhu et al. studied the ore selection process and conducted a comparative test of various schemes. It is believed that the oxidation roasting-chlorination roasting-cyanide process is more suitable for the ore properties and the best indicators are obtained. .

An ore in Hebei is a multi-metallic primary ore containing gold and silver. The ore composition is complex, and the symbiotic relationship between gold and silver and sulfide and sulfide is close. Hu Zhigang et al. obtained a good index by the comparison of various sorting processes, using the alkali pretreatment cyanidation method to extract gold and silver, and the cyanide tailings multi-metal flotation separation process. Alkali pretreatment and low concentration leaching of cyanide increased the leaching rate of gold from 61.78% to 91.74%. The flotation process uses a combination of inhibitors to effectively separate the separation of copper, lead and zinc , and achieve the purpose of comprehensive recovery of polymetallics.

The old tailings resource of Xiangxi Gold Mine is a kind of gold-containing material which is rare in China and abroad and is composed of fine particles and gold-encased inclusions and has complex composition and contains harmful elements of cyanidation. Yang Zhihong et al. found through the beneficiation test that the process of flotation of gold and flotation tailings cyanidation is suitable for the treatment of old tailings. Through the modification of the flotation system and the use of activated carbon fire regeneration process and the use of Y89-3 flotation gold and antimony, the recovery rate of gold and rhodium in the actual production process reached 67.40% and 35.73%, respectively.

The production scale of carbon-bearing gold ore in a certain area is 150 t / d. The original production adopts grinding and amalgamation-flotation-concentrate roasting-re-crushing carbon leaching process to extract gold. The total recovery rate of ore processing gold is 78%~79%. Due to continuous mining, ore depletion, the original process is complicated, the gold recovery rate is low, and there is no flue in the local area. The carbon dipping slag contains about 10 g/t of gold, and the production cost is high. In order to simplify the process, reduce costs and improve the economic efficiency of enterprises, Yuan Wensheng and others have used the amalgam-lime pretreatment-carbon leaching process to achieve a total recovery rate of 86.89%.

Lu Huichou and Xie Wenqing introduced the research results and production application practices of a comprehensive recovery of a zinc-gold mine in Yongtai County, Fujian Province. Mixed flotation produces zinc and gold mixed concentrates, cyanide leaching gold, and cyanide slag as zinc concentrates. The gold leaching rate is over 90%, the silver leaching rate is about 50%, and the zinc dissolution rate is 2.02%. The best leaching conditions are: pulp concentration 25%, pulp fineness 90% - 37 μm, pH > 13, time 30h, NaCN concentration 0.45%. The improved new process gold recovery rate is increased by more than 30%, the zinc recovery rate is increased by 8.0%, and the annual benefit is more than 4 million yuan.

Yu Yu et al. determined the copper and sulfur mixed-copper-sulfur separation and re-grinding-priority floating copper to recover copper and sulfur in tailings according to the different grain size of Jilongshan tailings. Part of the gold and silver in the tailings is recovered through the cement bevel chute before the flotation process, and the other part is enriched in the copper concentrate by flotation. The iron in the tailings is recovered by magnetic separation. The research and production practice of tailings reuse shows that it is effective to recover valuable elements such as copper, gold, silver, sulfur and iron in the tailings by conventional flotation-magnetic separation-re-election method. Obtained considerable economic benefits.

A copper mine in Tongling is a polymetallic mine with copper as the mainstay, associated with gold, silver, sulfur and iron. The gold recovery rate is only about 60%, and the main loss is in the tailings. In order to further improve the recovery rate of gold and increase the economic benefits of mines, Liu Hong et al. conducted a pilot study on the recovery of gold from tailings. According to the occurrence state and particle size distribution characteristics of gold in tailings, the tailings and their cyclone graded sand were separately re-elected, flotation and heavy-floating combined flow test. The results show that the tailings can be sorted by re-election-flotation process to obtain concentrate products with a gold content of 5.48 g / t and a recovery rate of 40.96%.

3 New progress in research on gold flotation reagents

Y-89 is a flotation collector newly developed in recent years. Tian Songhe and Luo Xinmin et al. 1362 started from process mineralogy, firstly identifying the grain size, occurrence state of gold in the ore, and the embedding relationship with sulfide, and then determining the process of suitable gold flotation through a large number of condition tests. Conditions and verification by closed circuit test. The test results show that Y-89 collector has a special harvesting effect on increasing the recovery rate of gold.

According to the nature of Wujiayu gold ore as arsenic-containing fine-grained gold ore, Zhang Dazhu and Jia Zhenwu conducted a small experimental study on the problems existing in the original ore dressing process. According to the results of the small test, the grinding process of the original process was changed to the second stage grinding; the single agent system of the original flotation butyl xanthate + pine oil was changed to butyl xanthate, 25# black medicine, sodium carbonate, A mixed drug of copper sulfate. In the mixed drug process, increasing the amount of butyl xanthate and 25th black drug can enhance the selectivity and capture ability of the agent to useful minerals; sodium carbonate as a regulator optimizes the flotation environment of the pulp, especially The activation degree of arsenic pyrite; the activation of copper sulfate makes pyrite and arsenopyrite more efficiently collected. After the transformation, the gold recovery rate increased by 26.11%, and the annual increase benefit was 1,542,100 yuan.

The Woxi ore and Yuershan ore processed by Hunan Chenzhou Mining Co., Ltd. are the ore produced by the large-scale quartz veins filled with gold, niobium and tungsten in the middle and low temperature hydrothermal fissures. Feng Zhijian et al used MA agent instead of Y89-3 floatation and gold minerals. Under the condition of slightly improved concentrate quality, the beneficiation index of 97.5% recovery rate and 90.23% gold recovery rate was obtained. The test results show that for sheet metal sulfide minerals, MA has a better sorting effect.

In the sand gold flotation test of a mining company, the particle size of gold, the type and amount of collector, the concentration of pulp and the effect of inhibitors on gold flotation were studied. The test results show that the flotation method can effectively recover gold from the gold mine. Good flotation results were obtained with the same collector dosage (0.05 kg / t) using amyl potassium xanthate, butyl potassium xanthate and 25 black drug. The same recovery can be obtained when the amount of ethyl yellow is twice the amount of the above agent. Therefore, the test used butyl potassium xanthate as a collector, T-80 as a gunner, and the recovery rate of flotation concentrate was 81% ~ 85%. The gold in the flotation tailings is recovered by a shaker, and the total recovery of gold can be increased to 85% to 90%.

Fan Shoulong and Jianfang Fang designed and synthesized six types of sulfur-containing organic flotation agents according to the rules of soft and hard acid and alkali, and tested the flotation performance of these six types of flotation agents for extracting gold from flotation plant tailings. . The experiment found that the best collector for enriching gold from tailings is methine diethyldithiocarbamate. It has a extraction rate of more than 90% for gold in flotation tailings, and can be used as a gold mineral flotation agent in froth flotation; organic phosphorus flotation agent has good foaming performance, and the flotation process can be less or not Foaming agents are added and the foaming properties do not affect their ability to concentrate gold. The synthesis of these new pharmaceutical agents provides a feasible solution for industrial development and application and the full utilization of resources in China.

Meng Xianyu and others have studied and studied the current production process of high-arsenic gold ore in Xionghuangpo, and studied the more reasonable and effective gold-arsenic sorting process for the characteristics of ore. The test results show that the combination of butyl xanthate and SK is used as the collector, lime, sodium sulfide and copper sulfate as the adjusting agent, and the new gold and arsenic sorting process with preferential arsenic is adopted, which significantly improves the production technical index.

Li Fengfeng and Wang Jinhua introduced the gold selection index of pentyl xanthate instead of butyl xanthate and butylammonium black drug as collector. The amyl yellow drug has good selectivity to Yindongpo gold ore. Strong ability and small dosage of pesticides not only greatly improve the recovery rate of gold and silver, but also comprehensively recover lead, zinc and sulfur. At the same time, the cost of mineral processing is also greatly reduced, which has created significant economic benefits for enterprises.

Y89- 5 collector is a new type of collector with high efficiency, low toxicity and good selectivity. Ouyang Caigui used this agent to select the polymetallic sulfide ore from the Jilongshan gold deposit in Hubei Province. The results show that the Y89-5 collector has strong adaptability to the Jiguanshan ore. In the case of no need to change the on-site process, replacing the on-site mixed collector can improve the selection of concentrate gold and copper while reducing the dosage of the agent, and achieve better economic and social benefits.

The Lungougou gold mine is representative of Guizhou's fine-grained primary gold deposits. The test found that a crude two-fine three-sweep process is applicable to the mine. However, due to the serious muddy nature, the slime must be strongly dispersed. Qi Hongming et al. used the combination of sodium carbonate + sodium silicate + sodium hexametaphosphate to disperse the slime, and achieved the expected results. In small-scale trials and expanded trial adjustments, it was found that the use of xanthate alone or black medicine alone was not as effective as the use of the combination agent Dinghuang + D-ammonium black, and the combination agent could improve the flotation gold concentrate grade and Recovery rate.

The new foaming agent 730E is one of the 730 series foaming agents developed by Kunming Yeyin New Materials Co., Ltd. At present, the 730 series foaming agent has been successfully applied to the production of flotation copper, lead-zinc and copper-tin mine in. Zheng Wei and Zhang Jie introduced the application research of 730E foaming agent in Zhenjing Gold Mine. The results show that the 730E foaming agent can not only completely replace the pine oil, but also obtain better flotation index.

4 Conclusion

In recent years, China has made many achievements in the development of gold sorting processes, flotation chemicals and new equipment. In particular, the transformation of the process and the formulation of new processes have solved some problems on the site, improved the selection of gold concentrates, and brought huge economic benefits to the company. At the same time, theoretical research and development of new equipment are relatively slow and need to be further strengthened. Today, with the depletion of mineral resources, we must learn from foreign advanced mineral processing methods, be brave in innovation, develop new and efficient gold collectors, further improve the shortcomings in the current gold selection process, and obtain the best gold. Selection indicators.

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