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Deep purification method for removing micro-tungsten from high-concentration molybdenate solution

A technology of deep purification and molybdate, which is applied in the field of ion exchange technology, can solve the problems of deep purification process without trace tungsten, and achieve the effect of good tungsten removal effect, low investment and convenient use

Inactive Publication Date: 2008-09-17
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0003] At present, the more in-depth research on the separation of trace tungsten from molybdate solution is the adsorption of tungsten by metal hydrated oxides. Process without deep purification of trace tungsten

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material is molybdenite calcine ammonia leaching solution (NH 4 ) 2 S purifies the ammonium molybdate solution after impurity removal, adjusts pH to 8.0 with concentrated nitric acid, contains molybdenum 121.73g / l in the solution, tungsten trioxide 1.379g / l, and adsorption resin is macroporous weakly basic anion exchange resin (No. S 18 ), adsorption on the column, exchange column Φ20×250mm, contact time of 80 minutes, after passing through 8 times of the resin bed volume of the feed liquid, the post-delivery liquid contains 121.73g / l of molybdenum and 0.101g / l of tungsten trioxide. At this time, three The removal rate of tungsten oxide is 92.5%.

Embodiment 2

[0028] Raw material liquid is the same as embodiment 1, pH=7.5, contains molybdenum 120.71g / l in the liquid before delivery, tungsten trioxide 1.371g / l, and adsorption resin is macroporous weakly basic anion exchange resin (number 8 63 ), adsorption on the column, exchange column Φ20×250mm, contact time 60 minutes, the average concentration of tungsten trioxide in the effluent of the first ten times of resin bed volume is 0.054g / l, and the removal rate of tungsten trioxide can reach 96%. Ammonium molybdate crystals precipitated from the mixed solution with a tungsten content of 0.0156%.

Embodiment 3

[0030] After ammonium molybdate crystal is dissolved with ammoniacal liquor, adjust solution pH value to 7.2, ammonium molybdate solution (molybdenum 120.7g / l, tungsten trioxide 0.174g / l,) carries out adsorption and removes tungsten, and adsorption column and resin are with embodiment 2, The contact time of adsorption is 40 minutes, the average concentration of tungsten trioxide in the effluent of the first 21 times of resin bed volume is 0.016g / l, and the removal rate of tungsten trioxide is 90.8%.

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Abstract

A method for completely cleaning high concentration molybdate solution by removing trace tungsten comprises the steps of pre-adjusting pH value of molybdate solution containing trace tungsten, allowing tungstate ions to completely polymerize to form polytungstate ions, and performing selective adsorption of tungsten with adsorption bed filled with macroporous weak base anion exchange resin, so as to completely remove tungsten from molybdate solution.

Description

technical field [0001] The invention relates to an ion exchange process for deep separation of low-content tungsten from molybdate solution. Background technique [0002] The processing performance and electrical, chemical and physical properties of molybdenum metal products are largely restricted by the content of impurity components in metal molybdenum, and the influence of element tungsten is particularly prominent. In order to obtain molybdenum metal products with excellent properties, it is necessary to prepare high-purity molybdenum intermediate compounds, such as ammonium paramolybdate, ammonium tetramolybdate or ammonium dimolybdate. Among the harmful impurity elements, the most difficult to deeply purify is tungsten, an element that often coexists with molybdenum. Because tungsten and molybdenum are similar elements, their physical and chemical properties are very similar, and they can form heteropolyacid ions with each other in a weakly acidic medium. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 肖连生龚柏藩王学文张贵清刘能生
Owner CENT SOUTH UNIV
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