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Lead oxide ore flotation process technology
Common lead oxide ore, there are three: white Galena (PbCO 3), lead alum (PbSO 4), color wulfenite (PbM O O 4).
The flotation of lead oxide ore has two types of methods: post-vulcanization flotation and direct flotation. (1) After the vulcanization, the yellow medicine flotation method is used. This is the most common method, and it is worth noting the way this sodium sulfide is added. The concentrated addition of sodium sulfide will cause the pH of the pulp to be too high, so that the lead mineral is inhibited, so the sodium sulfide should be added in stages. The place of sodium sulfide or sodium hydrosulfide with the addition of copper sulfate, ferric sulfate, sulfuric acid can even eliminate the adverse effects of excess curing agent.
The slime absorbs the vulcanizing agent and stains the mineral surface. Add sodium silicate, sodium pyrophosphate, and carboxymethyl cellulose, can overcome the deleterious effects of a portion of the sludge. Sometimes you need to take off the mud, but this will cause the loss of metals.
Gypsum in the gangue causes agglomeration of the slime in the pulp and acts with the carbonate ions to form a precipitate of calcium carbonate, covering the surface of the mineral, preventing the vulcanization of the mineral and the action of the collector . There are two ways to eliminate the influence of gypsum: 1 use sodium thiohydride instead of sodium sulfide or add a small amount of sulfuric acid to reduce the pH of the pulp, so that carbonate ions form soluble compounds without insoluble calcium carbonate; 2 in the pulp Ammonium chloride or other ammonium salts are added to increase the solubility of the calcium carbonate and limit its precipitation on the mineral surface. (2) Fatty acid plus neutral oil flotation method. This method is suitable for ore with high levels of refractory lead minerals, with little or no limestone and dolomite in the gangue. The indicators obtained by this method are often lower than the former one.