Method for separating and extracting metallic tungsten and molybdenum from molybdenum removal slag generated by smelting tungsten
A technology for extracting metals and removing molybdenum slag, applied in the direction of improving process efficiency, can solve problems such as unsatisfactory separation effect, high cost, pollution, etc., and achieve the effects of low processing cost, reduced pollution, and simple process
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Embodiment 1
[0015] Example 1: In the process of removing molybdenum from tungsten smelting, after molybdenum is sulfided into thiomolybdate by a vulcanizing agent, molybdenum removal slag produced by separating molybdenum by selective precipitation method (hereinafter referred to as molybdenum removal slag produced by selective precipitation method), Weigh 200 g as a raw material, and the mass percentage of water (the same in the following embodiments) is 29.3%, tungsten 10.2%, molybdenum 12.8%, and copper 18.3%. Add 1mol / L NaOH solution, heat and stir to dissolve, keep at 60°C, and filter after the pH stabilizes at 11-12 to obtain 135.2g of copper-containing residue, in which moisture is 49.4% and copper is 37.02%. The filtered alkaline solution was neutralized with 2mol / L HCl to a pH of 7.5, neutralized and filtered to obtain 13g of S residue. After neutralization, the solution was cooled to below 60℃, adjusted to pH 2-3 with 2mol / L HCl, then heated to above 90℃, kept for 1 minute and th...
Embodiment 2
[0016] Example 2: Weigh 200 g of the molybdenum removal slag produced by the selective precipitation method, and its moisture content is 29.3%, tungsten 10.2%, molybdenum 12.8%, and copper 18.3%. Add 4mol / L NaOH solution, heat and stir to dissolve, keep at 80°C and keep the pH at 11-12, then filter to obtain 133.9g copper-containing residue, of which moisture is 48.6% and copper is 37.26%. 1mol / L H for dissolving solution 2 SO 4 Neutralize to pH 8.0, neutralize and filter to obtain 10g of S residue. After neutralization, the temperature of the solution is cooled to below 60 ℃, and 1mol / L of H 2 SO 4 Adjust the acid to pH 2-3, then heat to above 90°C, keep it warm for 3 minutes and then cool down. After the temperature is lower than 60°C, filter, filter and wash to obtain 102g of molybdenum trisulfide, of which moisture 46.1%, molybdenum 32.12%, tungsten 0.42%; 1210ml tungsten-containing solution, including tungsten 11.5g / L and molybdenum 0.064g / L. The tungsten-containing solut...
Embodiment 3
[0017] Example 3: In the process of removing molybdenum from tungsten smelting, after molybdenum is sulfided into thiomolybdate by a vulcanizing agent, the molybdenum removal slag (hereinafter referred to as the molybdenum removal slag produced by the acid adjustment method) is separated by the acid precipitation method. Take 100g of dry slag as raw material, of which tungsten is 8.2% and molybdenum is 9.8%. Add 2mol / L NaOH solution, heat and stir to dissolve, keep at 90℃, pH value is stable at 9-10, no residue. 4mol / L H for dissolving solution 2 SO 4 Neutralize to pH 8.5, neutralize and filter to obtain 29g of S residue. After neutralization, the temperature of the solution is cooled to below 60℃, and 4mol / L of H 2 SO 4 Adjust the acid to pH 2-3, then heat to above 90°C, keep it warm for 5 minutes and then cool down, filter, filter and wash after the temperature is below 60°C to obtain 70g of molybdenum trisulfide, of which moisture 45.4%, molybdenum 25.5%, tungsten 0.62%; 15...
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