High-efficiency and clean tungsten smelting method

A smelting method and clean technology, applied in the field of tungsten smelting, can solve the problem of high cost and achieve the effect of reducing costs and reducing costs

Active Publication Date: 2013-08-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Through the above analysis, in the past, we were limited by the consideration of the separation of different processes, resulting in high costs.

Method used

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  • High-efficiency and clean tungsten smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The NaCl solution with a mass concentration of 26% was electrolyzed to obtain a NaOH solution with a concentration of 30%, which was reacted with wolframite with a grade of 60% according to 1.5 times the theoretical consumption, the liquid-solid ratio was 0.9:1, and the reaction temperature was controlled at 160 ℃, the reaction time is 2.0 hours, the leaching rate reaches 99.2%, and 180g / L Na 2 WO 4 solution. Dilute the solution to 25g / L, use 201×7 resin for adsorption, after washing completely, then use 5mol / LNH 4 Cl+2mol / LNH 3 h 2 O is desorbed to obtain a concentration of 256g / L ammonium tungstate solution. After ion exchange, the liquid and resin washing liquid are added by Cl 2 Feed Cl in a molar ratio of 1.02 to ammonia in the solution 2 Oxidation, converting ammonia nitrogen into N 2 The concentration of ammonia nitrogen in the discharge liquid is 0.3mg / L. The ammonium tungstate solution is evaporated and crystallized, and the crystallization rate is cont...

Embodiment 2

[0058] The NaCl solution with a mass concentration of 26% was electrolyzed to obtain a NaOH solution with a concentration of 28%, which was reacted with scheelite with a grade of 58% according to the theoretical consumption of 3.5 times, the solid-liquid ratio was 1:1, and the reaction temperature was controlled at 200°C, the leaching rate reaches 98.5%, and 220g / L Na 2 WO 4 solution. Use HCl to adjust the pH value of the solution to 4.5, use D301 resin for adsorption, and then use 25% ammonia water for desorption to obtain a concentration of 256g / L ammonium tungstate solution. After ion exchange, the liquid and resin washing liquid are added by Cl 2 Feed Cl with a molar ratio of 1.03 to ammonia in the solution 2 Oxidation, converting ammonia nitrogen into N 2 remove. After the reaction is completed, the ion-exchanged liquid is NaCl with a concentration of 112g / L, which is evaporated to saturation and then returned for electrolysis; the ammonia nitrogen concentration in t...

Embodiment 3

[0060] The NaCl solution with a mass concentration of 26% is electrolyzed to obtain a NaOH solution with a concentration of 28%. According to the theoretical consumption of 4.0 times, it reacts with scheelite with a grade of 61%. The solid-liquid ratio is 1.1:1, and the reaction temperature is controlled at 180°C, the leaching rate reaches 98.7%, and 215g / L Na 2 WO 4 solution. solution using H 2 SO 4 Adjust the pH value to 4.2, use D314 resin for adsorption, and then use 25% ammonia water for desorption to obtain a concentration of 256g / L ammonium tungstate solution. Resin use H 2 SO 4 After transformation, it is used to adsorb tungsten. The liquid after ion exchange, the resin washing liquid and the liquid after transformation are added according to Cl by the break point chlorination method 2 Feed Cl with a molar ratio of 1.1 to ammonia in the solution 2 Oxidation, converting ammonia nitrogen into N 2 remove. After the reaction is completed, the concentration of amm...

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Abstract

The invention provides a high-efficiency and clean tungsten smelting method. The method comprises the steps of: carrying out electrolysis on an NaCl solution to obtain NaOH and H2 from a cathode chamber and obtain Cl2 from an anode chamber; leaching a tungsten mineral raw material by the NaOH solution obtained by electrolysis to prepare a sodium tungstate solution; treating and transforming the obtained sodium tungstate solution by the existing technology to obtain a ammonium tungstate solution; oxidizing and removing ammonia nitrogen in waste smelting water by the Cl2 obtained by electrolysis; and reducing a tungsten oxide by the H2 obtained by electrolysis, thereby preparing tungsten powder. The method can be used for efficiently treating the tungsten mineral raw material to prepare the tungsten powder; and the method can save cost and no ammonia-nitrogen waste water is discharged.

Description

technical field [0001] The invention relates to the field of rare metal extraction metallurgy, in particular to the technical method of tungsten smelting. Background technique [0002] The NaOH decomposition method has become the mainstream process for processing tungsten mineral raw materials due to its strong adaptability to raw materials and high decomposition rate. However, in the actual tungsten smelting process, in order to obtain a high tungsten leaching rate, the consumption of NaOH is very large. For example, when dealing with black tungsten concentrate, the consumption of NaOH is 1.5-2 times of the theoretical amount when the leaching rate of 99% is to be obtained; and when processing scheelite concentrate, the NaOH consumption even reaches 3-2 times of the theoretical amount. 4 times. [0003] As we all know, NaOH is obtained by electrolysis of NaCl in the chlor-alkali industry. NaOH and H are produced in the cathode chamber during NaCl electrolysis 2 , the an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C25B1/26C22B3/12
CPCY02P10/20
Inventor 赵中伟陈星宇刘旭恒李江涛
Owner CENT SOUTH UNIV
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