Tungsten and molybdenum separation method

A separation method and tungsten and molybdenum technology, applied in the direction of improving process efficiency, can solve the problems of high molybdenum content and increasing the cost of molybdenum removal.

Active Publication Date: 2022-07-19
XIAMEN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the evaporation process in production is to evaporate and crystallize the high-molybdenum second-stage liquid (the ratio of tungsten and molybdenum is about 10) at one time until the ratio of tungsten and molybdenum in the mother liquor is about 1, so that the ratio of tungsten and molybdenum in the obtained APT is about 80, and the molybdenum content is relatively high. High, increasing the cost of subsequent removal of molybdenum

Method used

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  • Tungsten and molybdenum separation method

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) 7.5m 3 The high molybdenum second-stage liquid (WO 3 : 215.1g / L, Mo: 16.5g / L), carry out one evaporative crystallization, and obtain one mother liquor and one crystalline ammonium paratungstate (APT) after one filtration. In the process of one evaporative crystallization, the vapor pressure is 0.25MPa, the vacuum pressure is -0.025MPa, and the evaporation to the final liquid level is about 4m 3 , the final mother liquor volume is 0.53 of the total volume. Filtration by filter and sampling analysis to obtain WO in the primary mother liquor 3 : 75.2g / L, Mo: 30.2g / L, after alkali dissolution, WO in APT was obtained as a crystal 3 / Mo:145.

[0050] (2) subjecting the primary mother liquor to secondary evaporation and crystallization to obtain secondary mother liquor and secondary crystalline ammonium paratungstate (APT). After alkali dissolution, WO in APT is obtained by secondary crystallization 3 / Mo: 45, the secondary crystallization APT is calcined with 100kg ...

Embodiment 2

[0053] (1) 7.5m 3 The high molybdenum second-stage liquid (WO 3 : 210.1g / L, Mo: 12.5g / L), carry out one evaporative crystallization, and obtain one mother liquor and one crystal ammonium paratungstate (APT) after one filtration. In the process of one evaporative crystallization, the vapor pressure is 0.3MPa, the vacuum pressure is -0.03MPa, and the evaporation to the final liquid level is about 3.8m 3 , the final mother liquor volume is 0.51 of the total volume. Filtration by filter and sampling analysis to obtain WO in the primary mother liquor 3 : 65.2g / L, Mo: 25.1g / L, after being dissolved in alkali, a crystal of WO in APT was obtained 3 / Mo:135.

[0054] (2) subjecting the primary mother liquor to secondary evaporation and crystallization to obtain secondary mother liquor and secondary crystalline ammonium paratungstate (APT). After alkali dissolution, WO in APT is obtained by secondary crystallization 3 / Mo: 55, the secondary crystallization APT is calcined with 120...

Embodiment 3

[0057] (1) 7.5m 3 The high molybdenum second-stage liquid (WO 3 : 209.1g / L, Mo: 11.5g / L), carry out one evaporative crystallization, and obtain one mother liquor and one crystal ammonium paratungstate (APT) after one filtration. In the process of one evaporative crystallization, the vapor pressure is 0.28MPa, the vacuum pressure is -0.035MPa, and the evaporation to the final liquid level is about 4.5m 3 , the final mother liquor volume is 0.6 of the total volume. Filtration by filter and sampling analysis to obtain WO in the primary mother liquor 3 : 66.3g / L, Mo: 28.6g / L, after alkali dissolution, WO in APT was obtained as a crystal 3 / Mo:130.

[0058] (2) subject the primary mother liquor to secondary evaporative crystallization to obtain secondary mother liquor and secondary crystalline ammonium paratungstate (APT), and obtain WO in secondary crystalline APT after alkali dissolution 3 / Mo: 46, the secondary crystallization APT is calcined with 90kg of primary mother liq...

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Abstract

The invention discloses a method for separating tungsten and molybdenum, which comprises the following steps: S1, performing primary evaporation and crystallization on a feed liquid containing tungsten and molybdenum, and obtaining primary mother liquor and primary crystalline ammonium paratungstate after primary filtration; S2, performing secondary evaporation on primary mother liquor Crystallization, after secondary filtration, secondary mother liquor and secondary crystalline ammonium paratungstate are obtained; S3, the secondary mother liquor obtained in step S2 is subjected to tungsten and molybdenum separation; S4, the secondary crystalline ammonium paratungstate obtained in step S2 is calcined into yellow After tungsten, at least a part of yellow tungsten is added to the feed liquid in step S1; S5, after the primary crystalline ammonium paratungstate obtained after adding the yellow tungsten of step S4 in step S1 is calcined into yellow tungsten, the obtained yellow tungsten is dissolved. In concentrated ammonia water, the ammonia-dissolved second-stage liquid is obtained. According to the tungsten and molybdenum separation method of the present invention, the tungsten and molybdenum ratio in the evaporative crystallization high-molybdenum paratungstate ammonium paratungstate is increased by two evaporation crystallizations, the proportion of molybdenum entering the subsequent molybdenum removal system is reduced, and the subsequent molybdenum removal cost is reduced.

Description

technical field [0001] The invention relates to the technical field of separation of tungsten and molybdenum, in particular to a method for separation of tungsten and molybdenum. Background technique [0002] Tungsten and tungsten products have the advantages of high melting point, high density, high hardness, low thermal expansion coefficient, excellent corrosion resistance, good processing performance, etc., and can be used in cutting tools, lamps, medicine and other technical fields. Due to the reduction of tungsten ore and the decline of grade, the secondary recovery of tungsten resources has been paid more and more attention. [0003] Molybdenum and molybdenum alloy have high high temperature strength and high temperature hardness, low thermal expansion coefficient, good processing performance, etc., and can be used in biomedicine, mechanical processing and other technical fields. Due to the over-exploitation of molybdenum ore and excess production capacity, the second...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/22C22B34/36
CPCC22B3/22C22B34/36Y02P10/20
Inventor 杜庆华陈杰王海军
Owner XIAMEN TUNGSTEN
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