Method for cleaner production of sodium vanadate and sodium chromate by pressure leaching of vanadium slag

A sodium vanadate sodium chromate, clean production technology, applied in chemical instruments and methods, chromate/dichromate, vanadium compounds, etc., can solve the problems of increasing steps, polluting the environment, and high roasting temperature
CN102531056BActive Publication Date: 2014-11-05INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2014-11-05

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Abstract

The invention relates to a method for cleaner production of sodium vanadate and sodium chromate by pressure leaching of vanadium slag. The method comprises the following steps of: (1) mixing materials, namely mixing the vanadium slag and a solution of NaOH to obtain a reaction material; (2) reacting, namely performing oxidization reaction on the vanadium slag and oxidizing gas in the solution of NaOH under high pressure to obtain solid-liquid mixed slurry of a solution containing NaOH, Na3VO4, Na2CrO4 and water-soluble impurity components, and iron-rich tailings; (3) performing solid-liquid separation; (4) removing impurities; (5) crystallizing sodium vanadate; and (6) crystallizing sodium chromate. The method is easy to operate and is high in safety; and the operating temperature is greatly lower than the temperature of the traditional vanadium extraction process, energy consumption is low, the high-efficiency co-extraction of vanadium and chromium is realized, and the extraction rate of vanadium and chromium is over 95 percent.
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Description

technical field

[0001] The invention relates to the fields of vanadium slag hydrometallurgy and vanadium chemical industry, in particular to a method for producing sodium vanadate and sodium chromate through pressure leaching of vanadium slag. Background technique

[0002] Vanadium slag is a vanadium-enriched material produced by blowing vanadium-containing molten iron in the presence of oxygen-containing gas. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for vanadium extraction. The composition of vanadium slag is related to the production method and the composition of vanadium-titanium magnetite. Generally speaking, vanadium slag is composed of V 2 o 5 , SiO 2 、Al 2 o 3 , MgO, Cr 2 o 3 、TiO 2 , CaO and other components, and the composition of vanadium slag in each factory is also very different, but its phase structure is basically the same, all composed of spinel, olivine, quartz, etc.

[0003] Ent...

Claims

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