Sodium sulfide plays a major role in mineral processing
Created date: 2020/04/16
Sodium sulfide is a commonly used agent in the flotation of sulfide ore. Its role mainly includes the following three aspects to be introduced.
Role in mineral processing
A granular sodium sulfide production process, comprising raw materials, calcination, hot melt, clarification washing, chemical impurity removal, precipitation, evaporation and concentration, etc., storing the concentrated sodium sulfide solution in a reactor or a stirrer, sodium sulfide The content is ≥60%, pumped out by the pump, the impurities are filtered through the filter, the temperature of the sodium sulfide solution entering the granulator is 130-150°C, the conveying pressure is 0.3-0.5 MPa, and the nozzle is sprayed through the nozzle, in the steel strip cooler The product is cooled and formed, and the solidified particles are discharged into the feeder, and the vacuum packaging or the plastic bag is sealed and packaged, that is, the finished product is obtained. The above-mentioned granular sodium sulfide production process has reasonable design and advanced technology. According to the unique physical properties of the sodium sulfide concentrate, the granulation process conditions and granulation equipment are provided, and the product is granulated, and the vacuum packaging technology can be applied and effectively It prevents the deliquescence and oxidation of products, thus prolonging the inventory time. The granulated product can adopt an automatic packaging system to reduce labor intensity, improve the working environment and reduce packaging costs.
Role in mineral processing
1. It is the inhibitor of most sulfide minerals
When used in large amounts, it inhibits most of the sulfide ore. It inhibits the decreasing order of sulfide ore as follows: galena, sphalerite, chalcopyrite, porphyrite, copper blue, pyrite, and chalcopyrite. Since molybdenum ore is naturally floatable, sodium sulfide cannot inhibit it. Using this, when flotation molybdenite is used, Na2S can be used to suppress other sulfide ore.
2. It is a vulcanizing agent for non-ferrous metal oxide ore
Non-ferrous metal oxides cannot be directly collected by xanthate. However, if sodium sulfide and non-ferrous metal oxidized ore are added before the yellow medicine flotation, a film of sulfide ore can be produced on the surface of the mineral, and the yellow medicine can be harvested. This action of it is called vulcanization, so it can be used as a vulcanizing agent for non-ferrous metal oxides.
After the action of white lead ore and sodium sulfide, the surface color changes from white to dark. After the action of malachite and it, the surface color changes from green to dark, indicating that after vulcanization, the sulfide surfaces of the two minerals are different from those of minerals.
3. It is the de- sulphide of sulfide ore mixed concentrate
When the amount of sodium sulfide is large, the xanthate collector which adsorbs the surface of the mineral can be analyzed. Therefore, it can be used as a de-agent before separation of the concentrate. For example, before the separation of lead-zinc mixed concentrate or copper-lead mixed concentrate, the slurry can be concentrated, a large amount of it is added to remove the drug, and then washed, and fresh water is added to adjust the slurry, followed by separation and flotation.
In addition to the above three main functions, since it can form insoluble sulfide precipitates with many metal ions, it also has the effect of eliminating some ions harmful to flotation in the slurry.
Crystal sodium sulfide and Anhydrous sodium sulfide are also a classification of sodium sulphide, and you can learn more about them.