Selection of Cu Mo Separation Inhibitors

Copper molybdenum separating agent is the core of copper molybdenum separation. Common copper molybdenum separating agents mainly include sodium sulfide, sodium hydrogen sulfide, Knox reagent, sodium mercaptoacetate, etc. The amount of copper molybdenum separating agent is large, the cost is high, and the environmental pollution is serious. Now let's learn about the selection of copper molybdenum separating agent!
Copper molybdenum separating agent is recommended as follows.
1) Sodium sulfide method;
2) Sodium sulfide steam heating method;
3) Single compound method;
4) Sodium sulfide method;
5) Drug or combination with Knox;
6) Ferrocyanide and ferrocyanide methods;
7) Sodium hypochlorite or dioxygen water method;
8) Thioethanol and other organic agent methods.
Copper molybdenum separating agent: sodium sulfide, arsenic or phosphorous, copper minerals mainly including medicinal effective chalcopyrite and chalcopyrite; Ammonium, ferricyanide and ferrocyanide, oxidant, hypochlorite and hydrogen peroxide are effective to secondary copper sulfide minerals. Organic agents such as mercaptoethanol are newly developed non-toxic molybdenum associated sulfide agents, which are being promoted. Common measures to improve copper molybdenum separation effect are as follows:
1) Concentrate and detoxify, concentrate and remove the excessive agent in the mixed concentrate before separating the mixed concentrate, and ensure that the mixing and roughing reach the appropriate concentration.
2) Steam heating: Before separating copper and molybdenum, some foreign copper and molybdenum concentrators heat the copper molybdenum mixed concentrate with steam (85~90), sometimes add a proper amount of lime (0.8~1.2kg/t concentrate) to bubble oxygen or air. The purpose is to destroy the collector film on the surface of mixed concentrate through desorption and decomposition. In many countries, sodium sulfide heating (steam blowing) method is considered as a scheme for separating copper molybdenum concentrate. This method uses sulfide copper minerals and directly heats up (60-75) with steam along the flotation line. This not only accelerates the desorption and decomposition of the collector, but also alleviates the oxidation of sulfide, greatly reduces the amount of sulfide, and improves the separation index.
3) Gradually add sodium sulfide. Sodium sulfide method is a commonly used method for separating copper and molybdenum. It can be used for all metal sulfide minerals except molybdenum. Its dosage fluctuates widely, ranging from 2 to 30 kg/t. It is advantageous to add sodium sulfide in stages. Part of the sodium sulfide solution is often added to the stirring tank, and the other part of the sodium sulfide solid is put into the foam tank after rough separation and selection. The heat generated during the dissolution of sodium sulfide is used to raise the temperature of minerals and strengthen its role.
4) Flotation with nitrogen. Sodium sulfide, sodium sulfite, sodium sulfide in Knox reagent, phosphorus pentasulfide and other agents used for copper separation and flotation are easy to be oxidized and lose their effect. Due to copper molybdenum separation cycle, many times of cleaning (6~8 times) and long working wire, the consumption of these agents caused by oxidation increased significantly. In order to avoid reagent oxidation and reduce the dosage, the copper molybdenum coal preparation plant uses nitrogen instead of air for copper molybdenum separation flotation, which has achieved greater economic benefits, and can reduce the dosage of Knox reagent by 50%