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Ion exchange process for preparing ammonium tungstate solution

A technology of ion exchange and ammonium tungstate, applied in the field of ion exchange technology, can solve the problems of slow adsorption speed, complicated operation, and resin damage, and achieve the effects of reducing crystal precipitation, improving impurity removal efficiency, and inhibiting crystal precipitation

Inactive Publication Date: 2006-11-22
CHENZHOU DIAMOND TUNGSTEN PRODS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Among them, the classic process of using strong basic anion resin 201×7 is: adsorption of dilute sodium tungstate solution-leaching-high concentration NH 4 Ammonium tungstate is obtained by desorption of Cl solution, but the 201×7 resin cannot directly treat the APT crystallization mother liquor, and needs to be heated with alkali to convert it into a normal salt, and the treatment cost is high; the ion exchange of the weakly basic anion resin is mainly used for the recovery of the APT crystallization mother liquor. The impurity efficiency is low, the recovered product is crude sodium tungstate solution, the adsorption speed is slow, 2-3cm / min, and the alkali consumption is high
Although weakly basic anion resin ion exchange can also be used for the transformation of sodium tungstate after purification, the operation is complicated. During countercurrent desorption, the resin needs to be continuously exported and added from the exchange column, resulting in damage to the resin; Desorption by means of liquid pipe, not suitable for operation

Method used

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  • Ion exchange process for preparing ammonium tungstate solution

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: prepare macroporous weakly basic anion resin 600g (dry resin, the same below), adopt the containing SO of PH=2 4 2- acidic solution to regenerate the above resin. Get pure sodium tungstate solution 16L, its WO 3 The content is 69g / l, with SO 4 2- The solution adjusts the acidity of sodium tungstate solution to pH value 4.2, at this time WO 3 The content is 26g / l. Flow the acidic sodium tungstate solution through the regenerated resin for adsorption. The negative tungsten resin after adsorption is washed with pure water until the pH value is neutral; the concentration of ammonia water is 7mol / L and NH 4 With 5L of the mixed solution with a Cl concentration of 2mol / L, the neutral negative tungsten resin is desorbed at a linear flow rate of 15cm / min and then gradually reduced to 3cm / min, and the obtained ammonium tungstate solution is evaporated and crystallized to obtain APT. Its crystallization rate is 94%, and its quality reaches the APT-0 standard....

Embodiment 2

[0018] Embodiment 2: Prepare macroporous weakly basic anion resin 600g, adopt the SO containing SO of PH=1.5 4 2- acidic solution to regenerate the above resin. Get sodium tungstate solution 19L, its WO 3 The content is 69g / l, the mass ratio of tungsten and molybdenum is W: Mo=6500, and the SO4 containing PH=2 2- acidic solution, adjust the pH=4.9 of the above sodium tungstate solution, its WO 3 The content is 26.4 g / l. Flow the acidic sodium tungstate solution through the regenerated resin for adsorption. The negative tungsten resin after adsorption is washed with pure water until the pH value is neutral; the concentration of ammonia water is 8mol / L and NH 4 NO 3 6L of mixed solution with a concentration of 1.5mol / L, desorb the neutral negative tungsten resin at a linear flow rate of 14cm / min and then gradually decrease to 2cm / min, and then evaporate and crystallize the obtained ammonium tungstate solution to obtain APT. Its crystallization rate is 93%, and its quality...

Embodiment 3

[0019] Embodiment 3: Prepare macroporous weakly basic anion resin 600g, adopt the Cl containing Cl of PH=1.0 - hydrochloric acid solution to regenerate the above resin. Take WO 3 APT crystallization mother liquor 15L and WO with a content of 48.58g / l 3 16L of slag washing water with a content of 25g / l, the mass ratio of tungsten and molybdenum in the solution to WO 3 : Mo=3600; adding 0.5% Na with a volume ratio of tungsten-containing solution 2 S solution, with 2mol / L dilute hydrochloric acid and pH 2.5 containing SO4 2- The production waste liquid, adjust the pH=4.21 of above-mentioned solution, this moment WO 3 The content is 27g / l. The acid-adjusted solution is passed through the regenerated resin to perform adsorption. The negative tungsten resin after adsorption is washed with pure water until the pH value is neutral; the concentration of ammonia water is 10mol / L and NH 4 NO 3 5L of the mixed solution with a concentration of 2.2mol / L, desorb the neutral negative ...

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Abstract

The invention discloses an ionic exchanging technology to prepare ammonium tungstate solution, which comprises the following steps: adopting acid solution to regenerate for large-hole faintly alkaline negative resin; adjusting each solution with tungsten at 4-5; proceeding resin adsorption disposal; washing to neutral through negative tungsten resin; blending ammonia and ammonium salt; proceeding adsorption through negative tungsten resin after linear-flow speed from rapid to slow; removing impurity; conversing to produce the product. The invention is simple to operate, which guarantees the quality of ammonium tungstate solution.

Description

technical field [0001] The invention relates to a process for removing impurities from a tungsten-containing solution and transforming it into an ammonium tungstate solution in tungsten smelting, in particular to an ion exchange process for preparing the ammonium tungstate solution by using a weakly basic anion resin. Background technique [0002] At present, strong basic anion resin 201×7 and weak basic anion resin are mainly used in the ion exchange process of impurity removal and transformation of tungsten-containing solution. Among them, the classic process of using strong basic anion resin 201×7 is: adsorption of dilute sodium tungstate solution-leaching-high concentration NH 4 Ammonium tungstate is obtained by desorption of Cl solution, but the 201×7 resin cannot directly treat the APT crystallization mother liquor, and needs to be heated with alkali to convert it into a normal salt, and the treatment cost is high; the ion exchange of the weakly basic anion resin is ma...

Claims

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Application Information

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IPC IPC(8): C22B3/42C22B34/36
CPCY02P10/20
Inventor 黄良才姚珍刚姜文伟文百开
Owner CHENZHOU DIAMOND TUNGSTEN PRODS
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