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
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  • Application Information

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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

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  • Ion exchange process for preparing ammonium tungstate solution

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Example Embodiment

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

Example Embodiment

[0018] Example 2: Prepare 600g of a macroporous weakly basic anion resin, using pH=1.5 containing SO 4 2- The acidic solution to regenerate the above resin. Take 19L of sodium tungstate solution, its WO 3 The content is 69g / l, the mass ratio of tungsten and molybdenum is W:Mo=6500, and the PH=2 containing SO4 2- Acid solution, adjust the pH of the above sodium tungstate solution = 4.9, its WO 3 The content is 26.4g / l. The acid-adjusted sodium tungstate solution is passed through the regenerated resin for adsorption. The adsorbed negative tungsten resin 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 the mixed solution with a concentration of 1.5mol / L, first at a linear flow rate of 14cm / min and then gradually reduced to 2cm / min to desorb the neutral negative tungsten resin, and the obtained ammonium tungstate solution is evaporated and crystallized to obtain APT. Its crystallization rate is 93%, and its qua...

Example Embodiment

[0019] Example 3: Prepare 600g of macroporous weakly basic anion resin, using Cl containing PH=1.0 - The 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 is WO 3 :Mo=3600; add 0.5% Na with the volume ratio of tungsten-containing solution 2 S solution, use 2mol / L dilute hydrochloric acid and pH 2.5 containing SO4 2- Of the production waste liquid, adjust the pH of the above solution = 4.21, at this time WO 3 The content is 27g / l. The acid adjusted solution is passed through the above-mentioned regenerated resin for adsorption. The adsorbed negative tungsten resin 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 tungsten resin at a ...

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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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