Method for separating tungsten and molybdenum

A technology of tungsten and molybdenum and tungstic acid is applied in the field of separation of tungsten and molybdenum in the process of tungsten and molybdenum smelting, which can solve the problems of increased cost of separation of tungsten and molybdenum, loss of raw materials, lack of mature separation technology, etc., and achieves easy industrialization and application, good separation effect, Simple and easy-to-control operation

Active Publication Date: 2015-12-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the industrial application of this method is limited due to the crystallization problem of paratungstate, the generation of tungsten and molybdenum polymer ions, and the little difference in the properties of these ions themselves.
(2) The above methods cannot be applied to remove trace tungsten from molybdate solution
(3) The above methods are basically aimed at the removal of trace amounts of tungsten or molybdenum, but there is no mature separ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for separating tungsten and molybdenum, comprising the following steps:

[0033] (1) First to WO 3 Add sulfuric acid to the tungsten-molybdenum mixed solution with a concentration of 150g / L and a Mo concentration of 100g / L to adjust the pH value to 2.0, stir the reaction, control the reaction temperature at 60°C, and react for 30 minutes. After the reaction is completed, filter and wash to obtain tungstic acid mixed precipitation with molybdic acid;

[0034] (2) Add hydrogen peroxide with a concentration of 28% to the mixed precipitate at a molar ratio of 1.8:1 to the sum of tungsten and molybdenum, and simultaneously add 2mol / L of HCl;

[0035] (3) Control the temperature of the solution to 25°C, and add tungsten powder at a molar ratio of 0.5:1 to molybdenum to precipitate tungsten in the form of tungstic acid; filter to obtain tungstic acid precipitate and molybdenum-containing acidic solution;

[0036] (4) The obtained tungstic acid precipitate is dissolv...

Embodiment 2

[0040] A method for separating tungsten and molybdenum, comprising the following steps:

[0041] (1) First to WO 3 Add hydrochloric acid to the tungsten-molybdenum mixed solution with a concentration of 285g / L and a Mo concentration of 50g / L, adjust the pH value to 2.6, stir the reaction, control the reaction temperature at 80°C, and react for 60 minutes. After the reaction is completed, filter and wash to obtain tungsten Mixed precipitation of acid and molybdic acid;

[0042] (2) Add 30% hydrogen peroxide at a molar ratio of 1.65:1 to the sum of tungsten and molybdenum, and simultaneously add 1.8mol / L HCl;

[0043] (3) Heat the solution to 45°C, and add tungsten powder at a molar ratio of 0.2:1 to molybdenum to precipitate tungsten in the form of tungstic acid; filter to obtain tungstic acid precipitate and molybdenum-containing acidic solution;

[0044] (4) The obtained tungstic acid precipitate is calcined to obtain tungsten oxide;

[0045] (5) adopt ion exchange resin t...

Embodiment 3

[0048] A method for separating tungsten and molybdenum, comprising the following steps:

[0049] (1) First to WO 3 Add sulfuric acid to the tungsten-molybdenum mixed solution with a concentration of 210g / L and a Mo concentration of 10g / L, adjust the pH value to 2.6, stir the reaction, control the reaction temperature at 50°C, and react for 45 minutes. After the reaction is completed, filter and wash to obtain tungstic acid mixed precipitation with molybdic acid;

[0050] (2) Add 25% hydrogen peroxide at a molar ratio of 1.3:1 to the sum of tungsten and molybdenum, and add 2mol / L sulfuric acid at the same time;

[0051] (3) Heat the solution to 50°C, and add tungsten powder at a molar ratio of 1.2:1 to molybdenum to precipitate tungsten in the form of tungstic acid; filter to obtain tungstic acid precipitate and molybdenum-containing acidic solution;

[0052] (4) The obtained tungstic acid precipitate is dissolved in ammonia water, then evaporated and crystallized to obtain A...

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Abstract

The invention relates to a method for separating tungsten and molybdenum. The method comprises the following steps: (1) adding acid into a tungsten-molybdenum mixed solution and adjusting pH value to obtain mixed sediment of tungsten acid and molybdenum acid; (2) adding hydrogen peroxide and acid into the mixed sediment to form peroxide tungsten acid and peroxide molybdenum acid; (3) heating an obtained mixed solution, adding tungsten powder, reacting and filtering to obtain tungsten acid sediment and a molybdenum-containing acid solution; (4) calcining the prepared tungsten acid to prepare tungsten trioxide or dissolving by using ammonium hydroxide to obtain an ammonium tungstate solution and then evaporating and crystallizing to prepare APT; (5) extracting the molybdenum in the obtained molybdenum-containing acid solution by using an extraction agent/ion exchange resin; and (6) reversely extracting molybdenum-containing organic phase/resin by using ammonium hydroxide to obtain the ammonium molybdate solution, and carrying out acid precipitation to obtain ammonium tetramolybdate. The production process of tungsten-molybdenum products is taken into account in the method, so that the separated tungsten acid or molybdenum can be directly used for preparing the products thereof; the separation effect is excellent; the operation process is simple and is liable to control; the industrial popularization and application are liable to implement.

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 consumption of high-quality tungsten-molybdenum ore resources, complex tungsten-molybdenum paragenetic mineral resources are gradually being exploited and utilized. However, the impurity content in tungsten and molybdenum products seriously affects its performance. For tungsten products, the most difficult impurity element to remove is molybdenum, and for molybdenum products, tungsten is the most difficult to separate. In order to improve the performance of tungsten and molybdenum products, complete separation of tungsten and molybdenum is necessary. Therefore, the separation of tungsten and molybdenum is the key to efficiently utilize these tungsten and molybdenum intergrowth mineral resources. [0003] H...

Claims

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Application Information

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IPC IPC(8): C22B34/34C22B34/36C22B3/46
CPCY02P10/20
Inventor 陈星宇赵中伟
Owner CENT SOUTH UNIV
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