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Method for deeply separating tungsten and molybdenum from high-tungsten and high-molybdenum mixed solution

A mixed solution, high tungsten technology, applied in the direction of process efficiency improvement, etc., can solve the problems of growth, no separation effect of tungsten and molybdenum, effective adsorption of resin, etc.

Active Publication Date: 2012-01-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the tungsten concentration gradually increases, the height of the exchange zone will also increase significantly, which will inevitably cause the early leakage of tungsten, resulting in the inability of the resin to effectively adsorb it, so there is no separation effect on tungsten and molybdenum.
[0008] In summary, none of the existing separation methods of tungsten and molybdenum can effectively deal with the mixed solution with high relative concentration of tungsten and molybdenum. Therefore, it is of great significance to study the separation method of high tungsten and high molybdenum solution efficiently.

Method used

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  • Method for deeply separating tungsten and molybdenum from high-tungsten and high-molybdenum mixed solution
  • Method for deeply separating tungsten and molybdenum from high-tungsten and high-molybdenum mixed solution

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Example 1 The mixed solution of sodium tungstate and sodium molybdate, after adjusting its pH to 7.2, contains WO 3 5.5g / L, Mo 20.4g / L, the solution has been transformed into NO 3 - The adsorption is carried out in the exchange column of macroporous weakly basic anion resin D301 equipped with fine particles, the height of the exchange column is 80cm, and the control contact time is 150min. During the adsorption process, Mo leaked through after passing through 3 times the resin volume of the feed liquid, and after passing through 11 times the resin volume of the feed liquid, WO 3 Leakage, the amount of molybdenum flowing out at this time accounts for 75.5% of the total inflow, and the Mo and WO in the post-handover liquid 3 The contents are 15.4g / L and 0.011g / L respectively.

Embodiment 2

[0061] Example 2 The mixed solution of sodium tungstate and sodium molybdate, after adjusting its pH to 7.3, contains WO 3 6.4g / L, Mo 19.1g / L, pass the solution through the - Adsorption is carried out in the exchange column of the macroporous weakly basic anion resin D314 of the fine particle type, and four short exchange columns with a column height of 50 cm are connected in series, and the contact time is controlled to be 200 min. During the adsorption process, Mo in the four exchange columns leaked through sequentially after passing through 0.8 times, 1.7 times, 2.6 times, and 3.5 times the resin volume feed liquid respectively, and passed through 2.1 times, 4.5 times, 8 times, and 12 times the resin volume feed liquid respectively. WO in the last four exchange columns 3 Leaked through sequentially, the amount of Mo flowing out accounted for 82.2% of the total inflow, and the molybdenum content in the post-handover liquid was 15.7g / L, WO3 The content is almost 0. The load...

Embodiment 3

[0062] The mixed solution of ammonium tungstate and ammonium molybdate that distills ammonia to pH of 7.6 in embodiment 3 contains WO 3 35.1g / L, Mo79.6g / L, the solution has been transformed into Cl at a constant speed - Adsorption is carried out in an exchange column equipped with macroporous weakly basic anion resin D301 of the fine particle type, the exchange column is 125cm long, and the contact time is controlled for 190min. After the adsorption process passes through 0.3 times the volume of the resin, Mo leaks through, and after passing through 3 times Resin volume of feed solution after WO 3 Leakage, the amount of Mo flowing out at this time accounts for 70.98% of the total inflow, Mo, WO in the post-handover liquid 3 The contents were 56.5g / L and 0.019g / L respectively.

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Abstract

The invention provides a method for deeply separating tungsten and molybdenum from a high-tungsten and high-molybdenum mixed solution by using an ion exchange method. The method is suitable for treating the high-tungsten and high-molybdenum mixed solution, the mass concentration of WO3 of which is not less than 5g / L and the mass ratio of WO3 to Mo of which is between 1:40 and 40:1. The method comprises the following steps of: regulating the pH of the solution to a range from 6.5 to 8.5, filling the solution into a macroporous weak base anion resin exchange column which is not shorter than 80 centimeters and filled with fine granules, and controlling the contact time not less than 150 minutes, wherein nearly all tungsten in the solution is adsorbed, little molybdenum is adsorbed, and the concentration of the tungsten in the exchanged solution is less than 0.02g / L, so deep separation of the tungsten and the molybdenum is realized.

Description

Technical field: [0001] The invention belongs to the field of nonferrous metal extraction and is used for the separation of metal elements in a solution, especially for the deep separation of tungsten and molybdenum in a mixed solution with relatively high relative contents of tungsten and molybdenum and little difference between the two ratios. Background technique: [0002] Molybdenum and tungsten are impurity elements strictly controlled in tungsten and molybdenum metallurgical products respectively. my country's national standard GB10116-88 stipulates that the molybdenum content in 0-grade ammonium paratungstate is not more than 20ppm, while the national standard GB / T3460-2007 stipulates that in MSA-0 grade ammonium molybdate products Tungsten content is not more than 150ppm. However, due to the very similar properties of tungsten and molybdenum, the separation of the two has become a worldwide problem. [0003] At present, with the depletion of high-quality wolframite r...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/42C22B34/34C22B34/36
CPCY02P10/20
Inventor 赵中伟张家靓曹才放李江涛
Owner CENT SOUTH UNIV
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