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Method for deeply removing chromium from APT (Ammonium Paratungstate) crystallization mother liquor

A crystallization mother liquor, deep technology, applied in the production field of tungsten smelting, can solve the problem of ineffective separation of tungsten and chromium

Inactive Publication Date: 2015-01-07
CHONGYI ZHANGYUAN TUNGSTEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcoming that the prior art cannot effectively realize the separation of tungsten and chromium, the technical problem to be solved by the present invention is to provide a method for deeply removing chromium from the APT crystallization mother liquor, adding analytical soda ash type magnesium carbonate to the chromium-containing crystal mother liquor Chromium, which makes chromium form an insoluble compound Cr(OH) 3 Precipitation, while tungsten exists in the solution, at the same time, it will not introduce other impurities, effectively reduce the concentration of chromium in the crystallization mother liquor, achieve the purpose of deep separation of tungsten and chromium, realize the removal of chromium from the crystallization mother liquor and return to the existing tungsten smelting Technology, effective recovery of "tungsten" in the crystallization mother liquor

Method used

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  • Method for deeply removing chromium from APT (Ammonium Paratungstate) crystallization mother liquor
  • Method for deeply removing chromium from APT (Ammonium Paratungstate) crystallization mother liquor
  • Method for deeply removing chromium from APT (Ammonium Paratungstate) crystallization mother liquor

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Experimental program
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Effect test

Embodiment 1

[0024] To 500 ml with an initial chromium concentration of 0.16 g·L -1 Add 50% basic magnesium carbonate suspension to the crystallization mother liquor to adjust the pH=8.5, the reaction temperature is 100°C, the reaction time is 0.5 h, and the rotation speed is 250 rad / min. The tungsten concentration remains unchanged before and after the reaction):

[0025]

[0026] The results show that the chromium removal rate can reach more than 99.4%, and the chromium concentration in the crystallization mother liquor can be reduced to below 0.001 g·L-1, which can be returned to the existing tungsten smelting process for recovery.

Embodiment 2

[0028] Add 500 ml with an initial chromium concentration of 10.00 g·L -1 Add 50% basic magnesium carbonate suspension to the crystallization mother liquor to adjust the pH=9.7, the reaction temperature is 100 °C, the reaction time is 3.0 h, and the rotation speed is 400 rad / min. After the operation and analysis of the above experimental conditions, the obtained results are shown in Table 2 below The tungsten concentration remains unchanged before and after the reaction):

[0029]

[0030] The results show that the chromium removal rate can reach more than 99.9%, and the chromium concentration in the crystallization mother liquor can be reduced to 0.0015 g·L -1 Next, it can return to the existing tungsten smelting process for recycling.

Embodiment 3

[0032] Add 500 ml with an initial chromium concentration of 0.16 g·L -1 Add 50% basic magnesium carbonate suspension to the crystallization mother liquor to adjust the pH=11.0, the reaction temperature is 90 °C and 100 °C respectively, the reaction time is 2.0 h, and the rotation speed is 100 rad / min. After operating and analyzing under the above experimental conditions, the obtained results are as follows As shown in Table 3 (tungsten concentration remains unchanged before and after the reaction):

[0033]

[0034] The results show that the chromium removal rate can reach more than 99.3%, and the chromium concentration in the crystallization mother liquor can be reduced to 0.001 g·L -1 Next, it can return to the existing tungsten smelting process for recycling.

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Abstract

The invention belongs to the technical field of tungsten smelting production, and particularly relates to a method for deeply removing chromium from APT (Ammonium Paratungstate) crystallization mother liquor. The method for deeply removing the chromium from the APT crystallization mother liquor comprises the following steps: a, preparing 50% basic magnesium carbonate suspending liquid; b, regulating the pH value of a chromium-containing crystallization mother liquor; c, sealing a solution, heating in a water bath, stirring, heating, and reacting; and d, after the reaction is finished, filtering, detecting chromium content, recycling filter liquor to an existing tungsten smelting process, and effectively recovering tungsten. The method disclosed by the invention has the beneficial effects that basic magnesium carbonate is a novel reagent for deeply removing the chromium and can reduce the content of the chromium contained in the chromium-containing crystallization mother liquor to 1.5 mg.(L<-1>) without introducing other impurities, and the chromium removal ratio reaches as high as 99.9% and is superior to that of other chromium removing reagents, namely sodium hydroxide, ammonia water, magnesium chloride and the like. The method disclosed by the invention is one of critical technologies in a process for preparing uniformly chromium-doped APT powder and has great significance on realizing industrialization and preparing a high-end hard alloy.

Description

technical field [0001] The invention belongs to the production technical field of tungsten smelting, and specifically relates to a method for deeply removing chromium from an APT (ammonium paratungstate) crystallization mother liquor. Background technique [0002] Ultra-fine-grained WC-Co cemented carbide has high hardness and high strength "double high" properties, and is widely used in many fields such as woodworking tools, dental tools, metal processing and wear-resistant materials. It is well known that the performance of ultrafine cemented carbide is closely related to the grain size. With the decrease of WC grain size, the strength and hardness of the alloy will be greatly improved. Therefore, inhibiting the growth of tungsten carbide grains during sintering is the key technology for producing ultrafine cemented carbide. Studies have shown that transition metal carbides (Cr 3 C 2 ) can effectively inhibit the growth of WC grains during sintering. The current main ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/36
CPCY02P10/20
Inventor 赵立夫黄海万林生邓登飞
Owner CHONGYI ZHANGYUAN TUNGSTEN
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