Commonly used collectors for flotation wolframite are oleic acid, sulfosuccinic acid, benzoic acid and phosphonic acid. Salicylic acid is also a promising collector for floating black tungsten. Oleic acid has a strong catching power, but its selectivity is poor.
The pH of the wolframite ore is similar to that of scheelite , and sodium carbonate is used as a regulator. Flotation of wolframite with benzoic acid or phosphonic acid is carried out in an acidic medium, and the regulator is sulfuric acid or hydrochloric acid. Lead nitrate is commonly used as an activator.
Gangue flotation of wolframite inhibitors are: a mixture of sodium fluoride, sodium silicate, sodium silicate and aluminum sulphate (6: 1) a heavy chromate, sulfuric acid and hydrofluoric acid. However, the wolframite itself can be inhibited by a large amount of oxalic acid, sodium fluorosilicate (4 kg/t or more) and water glass, so the amount of the inhibitor must be strictly controlled.
A tungsten ore beneficiation plant process selection of fine mud, which feed size of 36% less than 0.074mm, metallic minerals are wolframite, pyrite, limonite, sphalerite, bismuthinite like. The grade of tungsten is 8% to 10%, and the gangue is garnet and quartz . Flotation with a mixture of benzoic acid and oxidized wax, after a rough two sweep results are as follows:
Raw ore grade WO3 6% to 8%
Concentrate grade WO3 40%~47%
Recovery rate 78% to 82%
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