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Fast dissolving method for ammonium paratungstate/tungsten trioxide

A technology of tungsten trioxide and ammonium paratungstate, which is applied in the direction of improving process efficiency, can solve the problems of high energy consumption, poor operating environment, and complicated process of the dissolution process, and achieves short process time, short process flow, and simple operation. Effect

Active Publication Date: 2017-04-05
湖南瑞友有色科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the prior art and provide a rapid dissolution method for ammonium paratungstate / tungsten trioxide, which solves the problems of high energy consumption, long time consumption, complicated process, and poor operating environment in the existing dissolution process. Energy saving, fast, simple process, good operating conditions, etc.

Method used

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  • Fast dissolving method for ammonium paratungstate/tungsten trioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) 100g ammonium paratungstate solid (WO 3 The mass percent content is 88.6%), 600mL organic phase mixed (composition is volume percent 10% N235 + 10% sec-octanol + 70% sulfonated kerosene) and 50mL sulfuric acid with a concentration of 6mol / L at 25°C for 10 minutes, ammonium paratungstate The dissolution rate is 100%.

[0026] (2) Add 250mL of ammonia water with a mass percentage concentration of 15% to the material obtained in step (1), and stir at room temperature for 15 minutes to obtain ammonium tungstate solution WO 3 The concentration is 295g / L, the volume is 295mL, and the direct recovery rate of tungsten is 98.22%.

Embodiment 2

[0028] (1) 100g ammonium paratungstate solid (WO 3 The mass percent content is 88.6%), 500mL of organic phase mixed (composed of volume percent 20% N235+10% sec-octanol+70% sulfonated kerosene) and 80mL of hydrochloric acid with a concentration of 12mol / L were stirred at 35°C for 9 minutes, ammonium paratungstate The dissolution rate is 100%.

[0029] (2) Add 220 mL of sodium hydroxide with a mass percentage concentration of 20% to the material obtained in step (1), and stir at room temperature for 10 minutes to obtain sodium tungstate solution WO 3 The concentration is 296.1g / L, the volume is 298mL, and the direct recovery rate of tungsten is 99.59%.

Embodiment 3

[0031] (1) 100g tungsten trioxide solid (WO 3 The mass percent content is 99.5%), 650mL organic phase mixture (composed of volume percent 25% N235 + 10% 2-octanol + 70% sulfonated kerosene) and 60mL sulfuric acid with a concentration of 6mol / L at 25 ° C for 20 minutes, three The dissolution rate of tungsten oxide is 100%.

[0032] (2) Add 250mL of ammonia water with a mass percentage concentration of 20% to the material obtained in step (1), and stir at room temperature for 25 minutes to obtain ammonium tungstate solution WO 3 The concentration is 313.65g / L, the volume is 310mL, and the direct recovery rate of tungsten is 97.72%.

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Abstract

The invention discloses a fast dissolving method for ammonium paratungstate / tungsten trioxide. Ammonium paratungstate / tungsten trioxide solids are added to one or more extraction agents of acid and amines, quaternary ammonium salts, phosphoric acid esters, alcohols and ketones and are mixed with a regulator and solvent oil, and the ammonium paratungstate / tungsten trioxide is completely dissolved with the obtained organic phase; ammonia water and a sodium hydroxide solution are poured into the organic phase and mixed, and organic phase regeneration is completed; and finally the organic phase and a tungstate solution are separated, the organic phase is reused, the tungstate solution is obtained, and the dissolving process of the ammonium paratungstate / tungsten trioxide is completed. According to the fast dissolving method, the amines, quaternary ammonium salts, phosphoric acid esters, alcohols and ketones are used as a reagent and mixed with a solvent, the organic phase is obtained for promoting decomposition of the ammonium paratungstate / tungsten trioxide, the process temperature is low, the reaction speed is high, the concentration of the obtained tungstate is high, the residual alkali concentration is low, no waste gas is generated, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy or chemical industry, and in particular relates to a rapid dissolution method of ammonium paratungstate / tungsten trioxide. Background technique [0002] Tungsten is an important strategic metal resource, and ammonium paratungstate / tungsten trioxide is an important chemical product of tungsten. During the tungsten smelting process, qualified products of ammonium paratungstate and tungsten oxide will be produced, or waste materials of ammonium paratungstate and tungsten oxide will be collected. At present, ammonium paratungstate is mostly dissolved with high-concentration ammonia water at a temperature of 120-160°C for 1-4 hours with stirring and leaching; some enterprises will promote the decomposition of ammonium paratungstate in the future and even obtain tungsten oxide through high-temperature roasting first, and then dissolve it with ammonia water to obtain tungstic acid ammonium solution; some ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B3/08C22B3/10C22B3/26
CPCC22B3/08C22B3/10C22B34/36C22B3/26Y02P10/20
Inventor 肖超罗鲲李义兵李玉平
Owner 湖南瑞友有色科技有限公司
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