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

CN104357671AInactive Publication Date: 2015-02-18CHONGQING UNIV

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHONGQING UNIV
Publication Date: 2015-02-18
Estimated Expiration: Not applicable · inactive patent

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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.

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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...

Claims

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