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First, the lime method
Lime is used to suppress pyrite inhibitor. When the lime and sulfur method is used for the separation of copper and sulfur, the pH value of the pulp or the free CaO content in the slurry can significantly affect the separation effect. The general rule is to treat dense iron ore with a large amount of pyrite. For the impregnated ore containing less pyrite, the pH value is about 9 to float copper to suppress sulfur.
Second, the lime + cyanide method
For pyrite with large planktonic activity, inhibition by lime plus cyanide is effective. However, since cyanide is highly toxic and pollutes the environment, people try to replace it with other methods such as lime and sulfite.
Third, lime + sulfurous acid method
This method is a widely used method for inhibiting pyrite without cyanide. For copper ore ore with raw ore containing sulfur, high mud or pyrite with high planktonic activity and not easily inhibited by lime, lime and sulfite (or SO 2 ) may be used to inhibit the separation of copper and sulfur from pyrite. The key to this method is to control the appropriate pulp pH and the amount of sulfurous acid (SO 2 ) according to the nature of the ore, and pay attention to the appropriate aeration and agitation. Experimental studies have shown that in the weakly acidic medium with pH=6.5~7, it is more effective to inhibit pyrite by using lime and sulfite. Compared with the lime method, this method has the characteristics of stable operation, good copper index and low dosage of activator such as sulfuric acid.
Fourth, heated oxidation method
This method can be used for copper-sulfur mixed concentrates that are more difficult to handle. This method can be divided into steam heating method with or without lime, which can accelerate the oxidation of pyrite surface and inhibit pyrite. For example, if a company adds lime to adjust pH=11, and then uses steam to heat to 60-70 °C, a good sorting effect is obtained.
In the copper-sulfur separation flotation, some people have also done research on lime and sodium humate, and also achieved significant sorting results. In addition, the use of a selective collector or a mixture of collectors can not only reduce the amount of inhibitors and activators, but also stabilize the operation. If a beneficiation plant with butyl xanthate butyryl amine or butyl xanthate plus black powder mixed medication OSN-43, as a result of the greatly increased copper concentrate grade and recovery.
Pyrite is inhibited upon activation, in order to save the amount of activator sulfate, copper sulfate, sodium carbonate, carbon dioxide gas or the like, to float the copper tailings Hydrocyclone concentrated slurry to remove a portion of the high alkalinity of water, Then add fresh water to dilute.
Copper and sulfur separation technology
Regardless of which flotation scheme is used for copper- sulfur ore, there is a problem of separation of copper and sulfur. The principle of separation is generally copper floating to suppress sulfur.