Method for separating and recovering vanadium and chromium from vanadium-chromium slag

A technology for separation and recovery of vanadium chromium slag, applied in the field of separation and recovery, can solve the problems of large equipment investment, difficult precise operation, complicated process, etc., and achieve the effect of less equipment investment, simple process and high purity

Inactive Publication Date: 2015-02-18
CHONGQING UNIV
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Problems solved by technology

However, this method has the disadvantages of complex process

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  • Method for separating and recovering vanadium and chromium from vanadium-chromium slag
  • Method for separating and recovering vanadium and chromium from vanadium-chromium slag
  • Method for separating and recovering vanadium and chromium from vanadium-chromium slag

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Embodiment Construction

[0014] A method for separating and recovering vanadium and chromium from vanadium-chromium slag, characterized in that the method comprises the following steps:

[0015] (1) Add vanadium chromium slag to sulfuric acid (H 2 SO 4 ) solution, then stand still, impregnate, and filter to obtain the filtrate dissolved in vanadium ions and chromium ions; among them, the mass of vanadium and chromium contained in vanadium-chromium slag accounts for 3.1% and the mass of chromium accounts for 18.8% as the calculation basis , under the situation that the mass concentration of sulfuric acid solution is 20~50%, sulfuric acid solution: vanadium-chromium slag=2~8L: 1Kg; Immersion temperature is 20~100 ℃, and the immersion time no longer has new vanadium ion, chromium ion Dipping out to a certain degree (usually 0.5 ~ 2h).

[0016] The function of this step is to separate the vanadium ions and chromium ions mixed in the vanadium-chromium slag from the vanadium-chromium slag.

[0017] (2) A...

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Abstract

The invention discloses a method for separating and recovering vanadium and chromium from vanadium-chromium slag. The method comprises the following steps: (1) adding the vanadium-chromium slag to a sulfuric acid solution for soaking, and filtering to obtain filter liquor in which vanadium ions and chromium ions are dissolved; (2) precipitating the filter liquor under an alkaline condition to obtain paste in which liquor and solids are mixed; (3) adding an excessive oxidizing agent to the paste in which liquor and solids are mixed to obtain a mixed solution containing high-valence vanadium ions and high-valence chromium ions; (4) adding a vanadium precipitant under an acidic and heating condition to obtain vanadium-containing precipitate and filter liquor; (5) roasting the vanadium-containing precipitate to obtain vanadium pentoxide, cooling and standing the filter liquor to separate out sodium sulfate crystals and separate out filter liquor containing chromium ions; and (6) precipitating the filter liquor containing chromium ions under the alkaline condition, then evaporating the obtained clear liquor to obtain sodium chromate crystals. The method for separating and recovering vanadium and chromium from the vanadium-chromium slag has the advantages of simple technical process, easiness in operation and relatively low equipment investment, the extraction rates of vanadium and chromium are relatively high, and the purity of vanadium pentoxide and the purity of sodium chromate crystals are also relatively high.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium slag. Background technique [0002] Vanadium chromium slag is produced in the production process of enterprises such as metallurgy, yellow phosphorus production or special steel smelting additives, and the annual production volume in our country is very large. Since the vanadium-chromium slag still contains a certain amount of vanadium (V) and chromium (Cr), if the vanadium-chromium slag is directly discharged as waste, it will not only cause a great waste of resources, but will not seriously pollute the environment. Therefore, resource utilization of vanadium-chromium slag (separation and recovery of vanadium and chromium from vanadium-chromium slag) is very necessary. At present, there are many methods for separating and recovering vanadium and chromium from vanadium-chromium slag. The method proposed by Cao Hongbin et al. [Cao Hongbin, Lin X...

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Application Information

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IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 陶长元彭浩刘作华杜军范兴周小霞李文生张兴然刘仁龙孙大贵唐金晶左赵宏谢昭明
Owner CHONGQING UNIV
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