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Tungsten-molybdenum separation method

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

Active Publication Date: 2021-06-01
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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Examples

Experimental program
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Effect test

Embodiment 1

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

[0050] (2) The primary mother liquor is subjected to secondary evaporation and crystallization to obtain the secondary mother liquor and secondary crystal ammonium paratungstate (APT). After alkali dissolution, the WO in the secondary crystal APT was obtained 3 / Mo: 45, the secondary crystallization APT is calcined...

Embodiment 2

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

[0054] (2) The primary mother liquor is subjected to secondary evaporation and crystallization to obtain the secondary mother liquor and secondary crystal ammonium paratungstate (APT). After alkali dissolution, the WO in the secondary crystal APT was obtained 3 / Mo: 55, secondary crystallization APT is calci...

Embodiment 3

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

[0058] (2) The primary mother liquor is subjected to secondary evaporation and crystallization to obtain the secondary mother liquor and the secondary crystal ammonium paratungstate (APT), and after alkali dissolution, the WO in the secondary crystal APT is obtained. 3 / Mo: 46, secondary crystallization APT is...

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Abstract

The invention discloses a tungsten-molybdenum separation method which comprises the following steps: S1, carrying out primary evaporative crystallization on a tungsten-molybdenum-containing feed liquid, and carrying out primary filtration to obtain primary mother liquor and primary crystallized ammonium paratungstate; S2, performing secondary evaporative crystallization on the primary mother liquor, and performing secondary filtration to obtain secondary mother liquor and secondary crystallized ammonium paratungstate; S3, performing tungsten-molybdenum separation on the secondary mother liquor obtained in the step S2; S4, calcining the secondary crystallized ammonium paratungstate obtained in the step S2 into yellow tungsten, and adding at least one part of yellow tungsten into the feed liquid in the step S1; and S5, calcining the primary crystallized ammonium paratungstate obtained after the yellow tungsten in the step S4 is added into the step S1 into yellow tungsten, and dissolving the obtained yellow tungsten into stronger ammonia water to obtain ammonia-soluble second-stage liquid. According to the tungsten-molybdenum separation method disclosed by the invention, a tungsten-molybdenum ratio in the evaporated and crystallized high-molybdenum ammonium paratungstate is increased by adopting a two-time evaporative crystallization mode, the proportion of molybdenum entering a 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 separation method 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 technical fields such as knives, lamps, and medicine. 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 alloys 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 mines and the excess production capacity, the secondar...

Claims

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Application Information

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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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