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Method for deeply removing chromium in tungsten-containing waste recycling process

A tungsten waste and deep technology, applied in the preparation of tungsten compounds, chemical instruments and methods, tungsten compounds, etc., can solve the problems of complicated procedures, high cost, large acid and alkali consumption, etc., and achieve simple and easy process, reduce Disposal cost, effect of low disposal cost

Inactive Publication Date: 2017-05-10
JINGMEN GEM NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of large acid and alkali consumption, complicated process and high cost in the existing sodium tungstate solution for chromium removal, the embodiment of the present invention provides a method for deep chromium removal in the process of recycling waste containing tungsten

Method used

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  • Method for deeply removing chromium in tungsten-containing waste recycling process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for deep removal of chromium in the recovery process of tungsten-containing waste, including the following steps:

[0037] 1) Use multi-point random sampling to obtain crude sodium tungstate solution, analyze and test the content of each element in it, and the test result is: WO 3 =65.57g / L, OH=23.84g / L, Mo=0.09g / L, CO 3 2- =26.15g / L, Cr=0.8g / L, V=0.13g / L;

[0038] 2) Put 7m 3 Transfer the crude sodium tungstate solution to 10m 3 After heating to 85℃, add 12kg sodium sulfide. After boiling for about 1h, sample and analyze the chromium content to be 0.25g / L. When the temperature in the reaction system drops to 50℃, press filtration treatment, it can be seen that the solution is removed Chromium in 68.8%;

[0039] 3) Dilute the low-chromium sodium tungstate solution obtained in step 2) by 3 times, and the obtained dilute sodium tungstate solution (ie, the pre-delivery solution) contains WO 3 19.52g / L;

[0040] 4) Pass the pre-delivery solution obtained in step 3) through...

Embodiment 2

[0044] A method for deep removal of chromium in the recovery process of tungsten-containing waste, including the following steps:

[0045] 1) Use multi-point random sampling to obtain crude sodium tungstate solution, analyze and test the content of each element in it, and the test result is: WO 3 =92.61g / L, OH=23.68g / L, Mo=0.13g / L, CO 3 2- =34.68g / L, Cr=1.5g / L, V=0.17g / L;

[0046] 2) Put 7m 3 Transfer the crude sodium tungstate solution to 10m 3 After heating to 80℃, add 20kg sodium sulfide. After boiling for about 4h, sample and analyze the chromium content to be 0.38g / L. When the temperature in the reaction system drops to 50℃, press filtration treatment, it can be seen that the solution is removed 74.7% of chromium in

[0047] 3) Dilute the low-chromium sodium tungstate solution obtained in step 2) by 5 times, and the obtained dilute sodium tungstate solution (i.e. the pre-delivery solution) contains WO 3 18.26g / L;

[0048] 4) Pass the pre-delivery solution obtained in step 3) thro...

Embodiment 3

[0052] A method for deep removal of chromium in the recovery process of tungsten-containing waste, including the following steps:

[0053] 1) Use multi-point random sampling to obtain crude sodium tungstate solution, analyze and test the content of each element in it, and the test result is: WO 3 =126.49g / L, OH=19.24g / L, Mo=0.16g / L, CO 3 2- =41.41g / L, Cr=2.1g / L, V=0.35g / L;

[0054] 2) Put 7m 3 Transfer the crude sodium tungstate solution to 10m 3 Add 26kg of sodium sulfide to the reaction kettle at 95℃. After boiling for about 2h, sample and analyze the chromium content to be 0.46g / L. When the temperature in the reaction system drops to 50℃, press filter treatment, it can be seen that the solution is removed 78.1% of chromium;

[0055] 3) Dilute the low chromium sodium tungstate solution obtained in step 2) 7 times, and the obtained dilute sodium tungstate solution (that is, the pre-delivery solution) contains WO 3 18.75g / L;

[0056] 4) Pass the pre-delivery solution obtained in step ...

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Abstract

The invention discloses a method for deeply removing chromium in a tungsten-containing waste recycling process. The method at least comprises the following steps: (1) adding a precipitator in a coarse sodium tungstate solution at the temperature of 60-100 DEG C, carrying out mixing treatment and filtering to obtain filtrate; (2) diluting the filtrate obtained in the step (1), and carrying out adsorption treatment by using anion exchange resin; (3) carrying out analytical treatment on an ion exchange column treated in the step (2) by using an analytical agent to obtain an ammonium tungstate solution; and (4) adding a vulcanizing agent in the ammonium tungstate solution, and carrying out vulcanizing and filtering treatment. According to the scheme, the chromium can be removed deeply, and the chromium removal rate can reach up to 99% or above. Meanwhile, by the scheme, a chromium removal process and a followed-up process of removing other impurities such as molybdenum are integrated, so that the treatment cost is greatly reduced. The method is suitable for a main process of tungsten recycling enterprises. The whole technological process is simple, convenient and practicable, the purifying efficiency is high, the concentration of residual chromium is low, and the treatment cost is low.

Description

Technical field [0001] The invention relates to the technical field of comprehensive recovery and reuse of tungsten-containing waste resources, in particular to a method for deep chromium removal in the recovery process of tungsten-containing waste materials. Background technique [0002] Due to the extensive mining of raw tungsten ore, the amount of primary tungsten resources has plummeted in recent years. Faced with the continuous reduction of tungsten resources, the recovery of tungsten from tungsten-containing waste has become an important breakthrough to alleviate the shortage of raw materials. [0003] At present, the domestic and foreign methods for processing tungsten-containing waste mainly include mechanical crushing, electrolysis, alkali leaching, sodium roasting, zinc melting, and direct leaching with ammonia or ammonium solution in a high-pressure oxygen-rich atmosphere. Due to the mature technology of the sodium roasting method and wide applicability to waste tungste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00C01G41/003C01P2006/80
Inventor 许开华陈星题张云河郭苗苗
Owner JINGMEN GEM NEW MATERIAL
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