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Method for separating tungsten and molybdenum from molybdenum-contained phosphotungstic acid/phosphowolframate solution

A technology of phosphotungstic acid salt and phosphotungstic acid, which is applied in the field of rare metal metallurgy to achieve the effect of avoiding large acid loss

Active Publication Date: 2016-02-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, there is currently no particularly effective method for efficiently separating tungsten and molybdenum from sulfur-phosphorus mixed acid systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a method for extracting tungsten from molybdenum-containing phosphotungstic acid / phosphotungstate solution, comprising the following steps:

[0036] (1) First to WO 3 The concentration of Mo is 260g / L, the concentration of Mo is 80g / L, and the concentration of P 2 o 5 The concentration is 100g / L, H 2 SO 4 In the phosphotungstic acid solution with a concentration of 80g / L, the molar ratio to the sum of tungsten and molybdenum is 2:1, add hydrogen peroxide with a concentration of 30%, stir and react, so that tungsten forms peroxytungstic acid, and molybdenum forms peroxymolybdic acid ;

[0037] (2) Pass SO into the mixture 2 , control the temperature of the mixed solution at 25°C, adjust the reaction time to 120 minutes, until the solution becomes colorless, precipitate tungsten in the form of tungstic acid, filter and wash;

[0038] (3) Dissolve the washed tungstic acid precipitate with ammonia water to obtain ammonium tungstate solution, a...

Embodiment 2

[0042] This embodiment provides a method for extracting tungsten from molybdenum-containing phosphotungstic acid / phosphotungstate solution, comprising the following steps:

[0043] (1) First to WO 3 The concentration of Mo is 50g / L, the concentration of Mo is 200g / L, P 2 o 5The concentration is 60g / L, H 2 SO 4 In the phosphotungstic acid solution with a concentration of 50g / L, the molar ratio to the sum of tungsten and molybdenum is 1.6:1, add hydrogen peroxide with a concentration of 25%, and stir to react, so that tungsten forms peroxytungstic acid, and molybdenum forms peroxymolybdic acid ;

[0044] (2) Pass SO into the mixture 2 , control the temperature of the mixed solution to 40°C, adjust the reaction time to 90 minutes, until the solution becomes colorless, and the tungsten is precipitated in the form of tungstic acid;

[0045] (3) Dissolve the washed tungstic acid precipitate with ammonia water to obtain ammonium tungstate solution, and then obtain APT through e...

Embodiment 3

[0049] This embodiment provides a method for extracting tungsten from molybdenum-containing phosphotungstic acid / phosphotungstate solution, comprising the following steps:

[0050] (1) First to WO 3 The concentration of Mo is 275g / L, the concentration of Mo is 10g / L, and the concentration of P 2 o 5 The concentration is 120g / L, H 2 SO 4 In the phosphotungstic acid solution with a concentration of 125g / L, the molar ratio to the sum of tungsten and molybdenum is 1.2:1, add hydrogen peroxide with a concentration of 28%, and stir the reaction to make tungsten form peroxytungstic acid, and molybdenum form peroxymolybdic acid ;

[0051] (2) Pass SO into the mixture 2 , control the temperature of the mixed solution to 55°C, adjust the reaction time to 60 minutes, until the solution becomes colorless, and precipitate tungsten in the form of tungstic acid;

[0052] (3) Dissolve the washed tungstic acid precipitate with ammonia water to obtain ammonium tungstate solution, and then...

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Abstract

The invention relates to a method for separating tungsten and molybdenum from a molybdenum-contained phosphotungstic acid / phosphowolframate solution. The method comprises the following steps that 1, hydrogen peroxide is added into the molybdenum-contained phosphotungstic acid / phosphowolframate solution; 2, a reduction or decomposition reaction is performed for precipitation to obtain tungstic acid, and filtering and washing are performed; 3, further roasting is performed on the obtained tungstic acid to obtain tungsten trioxide, or the tungstic acid is dissolved through ammonium hydroxide to obtain an ammonium tungstate solution, and finally evaporatve crystallization is performed to obtain APT; 4, an extraction agent is adopted for extracting molybdenum in the filtrate, a raffinate is returned back to the phosphotungstic acid / phosphowolframate solution; and 5, reverse extraction with ammonium hydroxide is performed to obtain an ammonium molybdate solution, and acid precipitation is performed to obtain ammonium tetramolybdate. The molybdenum separated out through the method is directly used for preparing the product, the separation effect is good, the operation process is simple and easy to control, and industrial application and popularization are easy.

Description

technical field [0001] The invention relates to the field of rare metal metallurgy, in particular to a technical method for separating tungsten and molybdenum in the smelting process of tungsten and molybdenum. Background technique [0002] With the continuous mining and utilization of high-quality wolframite resources, its reserves and grades are decreasing day by day, and complex scheelite is becoming the main tungsten ore resource. Due to the lanthanide contraction, tungsten and molybdenum exhibit very similar chemical properties due to the same atomic radius and similar electronic structure. Therefore, tungsten and molybdenum often coexist in scheelite in nature. At present, my country's high-molybdenum tungsten resources account for about 50% of the national scheelite industrial reserves, and high-tungsten resources in molybdenum resources also account for about 1 / 3. Such as the world's largest Shizhuyuan Mine, Mo / WO 3 About 2%; the associated scheelite reserves of L...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B34/34
CPCC22B34/34C22B34/36
Inventor 陈星宇赵中伟
Owner CENT SOUTH UNIV
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