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Method for preparing vanadium product and chromium product from double salt containing vanadium and chromium, and application thereof

A technology of vanadium chromium and products, which is applied in the fields of chromate/dichromate, chemical instruments and methods, vanadium oxide, etc. It can solve the problems that compound salts cannot be commercialized, and achieve the effect of optimizing resource utilization and saving costs

Inactive Publication Date: 2020-01-10
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention is a refinement and separation method for vanadium-chromium mixed crystals, qualified vanadium and chromium products can be prepared by using the method, and the problem that the compound salt obtained in the hydrometallurgical process of vanadium-chromium cannot be commercialized is solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Dissolving: Add chromium-containing double salt (source vanadium chemical industry, sodium vanadate 55wt%, sodium chromate 30wt%, sodium sulfate 6wt%, sodium hydroxide 6wt%, insoluble impurities 3wt%) into water, stir and heat to 90°C until fully dissolved;

[0054] (2) Filtration of impurities: the solution is filtered and separated to remove insolubles and impurities to obtain a mixed solution containing sodium vanadate, sodium chromate, sodium sulfate, and sodium hydroxide;

[0055] (3) Calcification: the mixed solution that step (2) obtains is added calcification agent (calcium oxide), and the consumption of calcification agent is 1 times of theoretical amount, and reaction temperature is 90 ℃, and the time is 1.5h, and sodium vanadate, Sodium sulfate is converted into precipitate;

[0056] (4) separation by filtration: the mixed slurry obtained in step (3) is subjected to solid-liquid separation to obtain a mixed solid containing calcium vanadate and calcium s...

Embodiment 2

[0062] (1) Dissolving: Add chromium-containing double salt (source vanadium chemical industry, sodium vanadate 55wt%, sodium chromate 30wt%, sodium sulfate 6wt%, sodium hydroxide 6wt%, insoluble impurities 3wt%) into water, stir and heat To 100 ° C, until fully dissolved.

[0063] (2) Filtration to remove impurities: the solution is filtered and separated to remove insoluble matter and impurities to obtain a mixed solution containing sodium vanadate, sodium chromate, sodium sulfate and sodium hydroxide.

[0064] (3) Calcification: the mixed solution obtained in step (2) is added into a calcifying agent (calcium hydroxide), the usage amount of the calcifying agent is 1.5 times of the theoretical amount, the reaction temperature is 100° C., and the time is 1.5 h. , Sodium sulfate is converted into precipitate.

[0065] (4) separation by filtration: the mixed slurry obtained in step (3) is subjected to solid-liquid separation to obtain a mixed solid containing calcium vanadate a...

Embodiment 3

[0071] (1) Dissolving: Add chromium-containing double salt (source vanadium chemical industry, sodium vanadate 55wt%, sodium chromate 30wt%, sodium sulfate 6wt%, sodium hydroxide 6wt%, insoluble impurities 3wt%) into water, stir and heat To 80 ℃, until fully dissolved.

[0072] (2) Filtration to remove impurities: the solution is filtered and separated to remove insoluble matter and impurities to obtain a mixed solution containing sodium vanadate, sodium chromate, sodium sulfate and sodium hydroxide.

[0073] (3) Calcification: the mixed solution obtained in step (2) is added into a calcifying agent (the mixture of calcium oxide and calcium hydroxide, the mass ratio is 1:1), the usage amount of the calcifying agent is 1 times of the theoretical amount, and the reaction temperature is At 80°C for 2.5 hours, sodium vanadate and sodium sulfate were converted into precipitates.

[0074] (4) separation by filtration: the mixed slurry obtained in step (3) is subjected to solid-liqu...

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Abstract

The invention discloses a method for preparing a vanadium product and a chromium product from a double salt containing vanadium and chromium, and an application thereof. The method comprises the following steps: 1) mixing the double salt containing vanadium and chromium with water, and performing heating for dissolving to obtain a mixed solution containing sodium vanadate, sodium chromate, sodiumsulfate, sodium carbonate and sodium hydroxide; 2) performing a reaction by using a calcifying agent, and converting the sodium vanadate, sodium sulfate and sodium carbonate to form a precipitate; 3)performing separation to obtain a solid phase and a liquid phase; 4) dissolving the obtained solid by using an acid, adding sulfuric acid to make the pH value be 4-5, and performing separation; and 5)preparing the vanadium product from the liquid phase obtained by separation, and preparing the chromium product from the liquid phase obtained by separation. The method is a refining and separating method for vanadium-chromium mixed crystals, is adopted to prepare the qualified vanadium and chromium products, and solves the problem that the composite salt obtained from vanadium and chromium in the hydrometallurgy process cannot be productized.

Description

technical field [0001] The invention relates to the technical field of vanadium-chromium metallurgy, and relates to a method and application for preparing vanadium and chromium products from a vanadium-chromium double salt, in particular to a method for preparing vanadium and chromium products from a vanadium-chromium double salt, and the prepared vanadium product and chrome products. Background technique [0002] Vanadium is an important non-ferrous metal. Vanadium and its alloys are widely used in metallurgy, petrochemical, national defense and other technical fields. Vanadium-chromium mixed crystals are generally produced in the vanadium-chromium-containing mud or chromium-containing vanadium slag wet extraction process of vanadium-chromium. The main components of vanadium-chromium mixed crystals are sodium vanadate, sodium chromate, sodium sulfate, sodium carbonate and sodium hydroxide, and also contain some trace impurities. Because vanadium-chromium mixed crystals con...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01G31/00C01G37/14
CPCC01G31/02C01G31/00C01G37/14C01P2006/80
Inventor 高明磊郑天新李兰杰周冰晶马朋鹏卢明亮
Owner HEBEI IRON AND STEEL
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