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 the problems of high cost, pollution, unsatisfactory separation effect, etc., and achieve the effects of low processing cost, reduced pollution and simple process

Inactive Publication Date: 2008-12-31
CHENZHOU DIAMOND TUNGSTEN PRODS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment of molybdenum slag is mainly treated by fire roasting to remove sulfur, and the solution of sodium tungstate and sodium molybdate is obtained after alkali dissolution, and the solution with similar tungsten and molybdenum content is used in the subsequent tungsten and molybdenum. The separation process is a bigger problem, the separation effect is not ideal, and the cost is high; and the SO produced by the roasting process 2 serious pollution

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  • Method for separating and extracting metallic tungsten and molybdenum from molybdenum removal slag generated by smelting tungsten

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: In the molybdenum removal process of tungsten smelting, after molybdenum is vulcanized into thiomolybdate by vulcanizing agent, the molybdenum removal slag produced by separating molybdenum through selective precipitation (hereinafter referred to as the molybdenum removal slag produced by selective precipitation method), Weigh 200g as raw material, the mass percent of its moisture (the same as in the following examples) is 29.3%, tungsten 10.2%, molybdenum 12.8%, copper 18.3%. Add 1mol / L NaOH solution, heat, stir and dissolve, keep warm at 60°C, and filter after the pH value is stabilized at 11-12 to obtain 135.2g of copper-containing residue, of which water is 49.4% and copper is 37.02%. The alkaline solution obtained by filtration was neutralized with 2 mol / L HCl to a pH value of 7.5, neutralized and filtered to obtain 13 g of S residue. After neutralization, cool down the solution below 60°C, adjust the acidity with 2mol / L HCl to pH 2~3, then heat up to...

Embodiment 2

[0019] Example 2: Weigh 200g of the molybdenum removal slag produced by the selective precipitation method, which contains 29.3% moisture, 10.2% tungsten, 12.8% molybdenum, and 18.3% copper. Add 4mol / L NaOH solution, heat and stir to dissolve, keep warm at 80°C, and filter after the pH value is stabilized at 11-12 to obtain 133.9g of copper-containing residue, of which water is 48.6% and copper is 37.26%. Dissolving solution with 1mol / L H 2 SO 4 Neutralize to pH 8.0, neutralize and filter to obtain 10 g of S residue. After neutralization, the solution is cooled to below 60°C, and 1mol / L H 2 SO 4 Adjust acid to PH value 2-3, then heat to above 90°C, keep warm for 3 minutes, then cool down, filter when the temperature is lower than 60°C, filter and wash to obtain 102g of molybdenum trisulfide, of which water is 46.1%, molybdenum is 32.12%, tungsten 0.42%; 1210ml of tungsten-containing solution, including 11.5g / L tungsten and 0.064g / L molybdenum. The tungsten-containing solu...

Embodiment 3

[0020] Embodiment 3: in the process of removing molybdenum in tungsten smelting, after molybdenum is vulcanized into thiomolybdate by vulcanizing agent, the molybdenum-removing slag produced by separating molybdenum through the acid-adjusting precipitation method (hereinafter referred to as the molybdenum-removing slag produced by the acid-adjusting method) is called Take 100g of dry slag as a raw material, including 8.2% tungsten and 9.8% molybdenum. Add 2mol / L NaOH solution, heat and stir to dissolve, keep warm at 90°C, the pH value is stable at 9-10, and there is no residue. The dissolving solution uses 4mol / L of H 2 SO 4 Neutralize to pH 8.5, neutralize and filter to obtain 29g of S residue. After neutralization, the solution was cooled to below 60°C, and 4mol / L H 2 SO 4 Adjust acid to PH value 2-3, then heat to above 90°C, keep warm for 5 minutes, then cool down, filter when the temperature is lower than 60°C, filter and wash to obtain 70g of molybdenum trisulfide, in...

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Abstract

The invention provides a novel wet separation method for separating and extracting metallic tungsten and molybdenum from molybdenum-removing slag produced by a sulfide method in the tungsten smelting, sequentially comprising: fully dissolving tungsten and molybdenum metallic elements by directly using (1-4)mol/L alkali solution under the conditions of agitation and temperature of 60 DEG C to 100DEG C to obtain an alkaline solution with a pH value of over 9 and then filter the alkaline solution; neutralizing the solution to have a pH value of 7.5 to 8.5 with (1-4)mol/L acid and filtering the solution; adjusting the acid to make the solution have a pH value of 2 to 3 at a temperature of under 60DEG C, then warming the solution to above 90DEG C and preserving the heat for 1 to 5 minutes, and cooling the solution to under 60DEG C for filtration, so as to obtain an acidulous tungstenic dilute solution and precipitation of molybdenum trisulfide; and gaining a sodium tungstate solution of (100-200)g/L by adopting the conventional process; and the method can effectively separate and extract valuable metals such as tungsten and molybdenum, and has advantages of stable and simple process and low treatment cost.

Description

technical field [0001] The invention relates to a method for separating and extracting valuable metals such as tungsten and molybdenum from molybdenum-removing slag produced by tungsten smelting, especially a method for separating and extracting metal tungsten and molybdenum from the molybdenum-removing slag produced by sulfidation in tungsten smelting. Background technique [0002] During the tungsten smelting process, key processes including molybdenum removal treatment are required. The commonly used molybdenum removal method is to first add vulcanizing agent to vulcanize, so that molybdenum is preferentially converted into thiomolybdate, and then separate molybdenum through acid adjustment precipitation, selective precipitation and other methods. Alternative forms exist, and its mass percentage is Mo: 5-15%, which also contains a large amount of entrained or adsorbed tungsten in the form of tungstate, and the general mass percentage is WO 3 : 5-10%. In the form of tigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B34/36C22B34/34
CPCY02P10/20
Inventor 曾欣荣梁卫东黄良才胡党
Owner CHENZHOU DIAMOND TUNGSTEN PRODS
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