Flotation of copper oxide ore

Copper oxide ore flotation process employed and described: the floatability of oxidized copper ores, generally worse than the flotation of copper sulphide ores, and by the presence of copper in the form and composition of gangue minerals such as greater impact For example, when copper is present in the form of carbonate (malachite, azurite), the floatability is relatively good, and it exists in the form of silicate (methazate). The floatability is poor, free. Copper oxide is easy to float, and copper oxide is basically not recovered by a single flotation method. Where the state into separate copper oxide present was called free copper oxide, copper oxide can all free cyanide was dissolved in a solution, when copper and gangue (e.g., ferric hydroxide) is present cemented together, to some form The copper oxide mineral is called copper oxide combined, and its type of cementation is various. It can be mechanically formed into an inclusion of extremely finely dispersed copper minerals in the gangue, or it can be chemically similar to the same type. It can also be an adsorbed color dye, and all of the combined copper oxide cannot be dissolved in the cyanide solution. The percentage of bound copper in the copper oxide is referred to as the binding rate. The gangue minerals are mainly siliceous (such as quartz ), and are more difficult to float. Carbonate-based (such as calcite , dolomite, etc.) are more difficult. If they contain more iron hydroxide and clay . Separation is more difficult when the slime is mixed, especially when they are tightly combined.

The flotation of oxidized minerals is mostly carried out by a vulcanization process. Since the oxidized ore after vulcanization achieves a high flotation speed, the first coarsely selected head 1-2 tank directly produces the concentrate product. The way of adding chemicals has special significance for the flotation of copper oxide ore, especially sodium sulfide, which is not only an activator of copper oxide ore, but also an inhibitor of copper sulfide ore. Therefore, it is not suitable to add enough when added. It is a batch and multi-stage addition method. Therefore, the first operation (rough selection) in the flotation process is 70-80% of the total amount, ensuring that the concentration of sodium sulfide is sufficient. When vulcanized with sodium sulfide, lime is used as a pH adjuster, pH 8.5-9.5, and sodium sulfide is used to obtain a desired effect. While using sodium sulfide, an appropriate amount of ammonium sulfate and sodium sulfide were added in a 1:1 ratio. It can improve the recovery rate of copper oxide ore. The reason is that the decrease of pH value after adding ammonium sulfate is beneficial to the increase of HS-concentration, and the vulcanization reaction is accelerated, which is beneficial to the flotation of copper oxide ore. However, when vulcanization is used and the mixed ore is oxidized, the amount of ammonium sulfate is too large to inhibit the sulfide minerals. Therefore, the amount of addition is strictly controlled.

Hydroxamate was added and mixed butyl xanthate, difficult-dressing was chrysocolla, limonite ore containing copper, which are strong collecting capability, hydroxybutyrate oxime PH10 ~ 11 to sulfide ore when very Good harvesting effect, but when the pH is lower than 8, it is unfavorable for the selection of sulfide ore.

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