The main beneficiation process of zinc oxide is flotation. After heating and sulfurization, xanthate flotation is used. In this method, the ore is first deslimed, and then the slurry is heated to 50-60°C and sulfurized with sodium sulfide. , and then use high-grade xanthate and black powder for flotation. If vulcanized at room temperature, the vulcanization film will not be strong and the flotation effect will be poor. During low-temperature vulcanization, it is easy to form colloidal precipitates. On the contrary, the higher the vulcanization temperature, the stronger the sulfide film formed, the less precipitates formed in the slurry, and the faster the sulfurization speed. The concentration of sodium sulfide in the slurry, It is also a very important process factor during vulcanization. Sludge, iron oxide and manganese oxide in the slurry will consume sodium sulfide and reduce the quality of the concentrate, so they should be removed in advance. First sulfide and then amine flotation method, this method is suitable for flotation of zinc carbonate, silicate and other oxidized minerals.
The advantage of amine collector is that in alkaline medium, it has good effect on quartz and alkaline earth metal carbon. Salts have no significant collection effect. When using amine collectors, the remaining sodium sulfide not only has no inhibitory effect, but also activates zinc oxide minerals. Primary amines have a strong collecting effect on zinc oxide, especially those containing 12-18 carbon atoms. Primary amines are particularly significant, while the collection capabilities of secondary and tertiary amines are very weak. Lead and zinc flotation regulators Adjusters can be divided into inhibitors, activators, medium pH regulators, slime dispersants, coagulants and re-coagulants according to their functions in the flotation process.
Among the inhibitors: Zinc sulfate. The pure form of zinc sulfate is white crystal, easily soluble in water. It is an inhibitor of sphalerite. It usually has inhibitory effect only in alkaline slurry. The higher the pH of the slurry, the stronger its inhibitory effect. The more obvious it becomes. Zinc sulfate produces the following reaction in water: ZnSO4＝Zn2++SO42-Zn2++2H20=Zn(OH)2+2H+Zn(OH)2 is an amphoteric compound, which dissolves in acid to form a salt Zn(OH)2+H2S04＝ ZnSO4+2H2O in alkaline medium gives HZnO2- and ZnO22-. Their adsorption to minerals enhances the hydrophilicity of mineral surfaces. Zn(OH)2+NaOH=NaHZnO2+H2O Zn(OH)2+2NaOH=Na2ZnO2+2H2O When zinc sulfate is used alone, the co-suppression effect is poor, and it is usually combined with cyanide, sodium sulfide, sulfite or thiosulfate. , sodium carbonate, etc. used together. The combined use of zinc sulfate and cyanide can enhance the inhibitory effect on sphalerite. The commonly used ratio is: cyanide: zinc sulfate = 1:2-5. At this time, CN- and Zn2+ form colloidal Zn(CN)2 precipitate.
Post time: Nov-19-2024
