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Method for decomposing scheelite with ammonium salts

A technology of scheelite and ammonium salt, which is applied in the direction of improving process efficiency to achieve the effect of reducing auxiliary reagents and energy consumption

Active Publication Date: 2011-08-17
CHONGYI ZHANGYUAN TUNGSTEN +1
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  • Abstract
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Problems solved by technology

Therefore, as long as the transformation process is adopted, the discharge of acid-base waste liquid (containing harmful impurities) will occur

Method used

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  • Method for decomposing scheelite with ammonium salts
  • Method for decomposing scheelite with ammonium salts

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Experimental program
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Embodiment Construction

[0020] Raw materials and reagents: scheelite WO 3 Content 67%, industrial ammonium phosphate (NH 4 ) 3 PO 4 ·3H 2 O content 98%, industrial liquid ammonia content 99%.

[0021] Decomposition device: 1L far-infrared heating stainless steel autoclave.

[0022] Results: The levels of each influencing factor were determined according to the results of the single factor experiment, and the orthogonal table was established by selecting six factors including the amount of ammonium phosphate, temperature, holding time, liquid-solid ratio, ammonia concentration, and stirring speed. The experiment is still carried out in a 1L autoclave, and the amount of scheelite used in each experiment is 100g. The amount of ammonium phosphate is 1.5, 1.8, 2.0, 2.5, 3.0 times of the theoretical amount; the reaction temperature (°C) is: 140, 160, 180, 200, 220; , 5; the ammonia concentration (g / l) is 30, 60, 80, 100, 135; the liquid-solid ratio is: 1, 1.5, 2, 2.5, 3; the stirring speed (r / min) is...

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Abstract

The invention relates to the decomposition technology of scheelite, in particular to a method for decomposing scheelite by adopting ammonium phosphate and liquid ammonia. The method is characterized in that the ammonium phosphate and the liquid ammonia are used as decomposers; the amount of the ammonium phosphate is not less than 1.8 times theoretical amount; the ammonia concentration is not lessthan 30g / l; the reaction temperature is 180-220 DEG C; the heat preservation time is 1.5-5 hours; the liquid-solid ratio is (2:1)-(3:1); and the stirring speed is 25-450r / min. The method has the positive effects of realizing closed cyclic smelting and zero discharge of scheelite, simultaneously lowering the production cost and increasing the economic benefits.

Description

technical field [0001] The invention relates to a decomposition technology of scheelite, specifically, a method for decomposing scheelite by ammonium phosphate + liquid ammonia. Background technique [0002] The current scheelite smelting at home and abroad mainly includes the following processes: [0003] 1. Caustic soda decomposition-ion exchange process [0004] The decomposition of scheelite caustic soda is mainly based on the following reactions: [0005] wxya 4 (s)+2NaOH(aq)=Na 2 WO 4 (aq)+Ca(OH) 2 (s) [0006] The amount of alkali is generally 2.3 to 2.5 times of the theoretical amount, and the temperature is 170°C. During the discharge and dilution process after decomposition, add a small amount of PO 4 3- (The amount of phosphate added is about Ca(OH) 2 converted to Ca 3 (PO 4 ) 2 3-5% of the amount required for the reaction), or add a small amount of F - , the principle of both is the same, both make Ca(OH) 2 Insoluble calcium compounds (Ca 3 (PO 4...

Claims

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Application Information

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IPC IPC(8): C22B3/14C22B34/36
CPCY02P10/20
Inventor 万林生赵立夫黄泽辉徐国钻李红超王忠兵代亚琦习雪康孙丽龚丹丹
Owner CHONGYI ZHANGYUAN TUNGSTEN
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