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Method for utilizing chrome-vanadium solution to produce vanadium product and chromium sulfate basic

A chromium sulfate solution technology, applied in the field of vanadium chemical metallurgy, can solve the problems of easy accumulation of impurity elements, high equipment requirements, harsh operating conditions, etc., and achieve the effect of good application prospects, feasible technology, and simple equipment

Active Publication Date: 2018-04-24
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But there are also the following problems: (1) due to the use of high pressure and strong alkali, the requirements for equipment materials are high; (2) the continuous enrichment of impurity elements in the circulating mother liquor affects the quality of the product, and the impurity removal process is required
Although the method realizes the direct separation of vanadium chromium in vanadium chromium solution by adopting electrochemical method, the electrolytic process consumes too much energy, and the separation rate of vanadium chromium is still too low, and the purity of the obtained product is insufficient.
[0007] Although the above methods can effectively extract vanadium chromium, there are generally problems such as high requirements for equipment, easy accumulation of impurity elements, harsh operating conditions, high energy consumption, and insufficient product purity.

Method used

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  • Method for utilizing chrome-vanadium solution to produce vanadium product and chromium sulfate basic
  • Method for utilizing chrome-vanadium solution to produce vanadium product and chromium sulfate basic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Hydrolysis of vanadium precipitation: Add hydrochloric acid to the vanadium-chromium solution containing 24.5g / L of vanadium and 568.2mg / L of chromium to adjust the pH to 1.8, and then filter after hydrolysis of the vanadium precipitation to obtain solid-phase red cakes and precipitates containing vanadium and chromium. Vanadium after solution;

[0059] (2) Calcification reaction: According to the molar ratio of Ca / V of 1.5, mix the red cake obtained in step (1) and calcium oxide into water for calcification reaction, control the reaction temperature to 95°C, and the reaction time to 1h, after filtration Obtain solid-phase calcium vanadate, and obtain vanadium pentoxide through ammonification, transsolution, impurity removal, crystallization and calcination of the obtained calcium vanadate;

[0060] (3) Enrichment of chromium: add polyferric chloride to the liquid after the vanadium precipitation obtained in step (1), adjust the pH to be 5 and carry out the secondar...

Embodiment 2

[0064] (1) Hydrolysis of vanadium precipitation: Add hydrochloric acid to the vanadium-chromium solution containing 24.5g / L of vanadium and 568.2mg / L of chromium to adjust the pH to 1.9, and then filter after hydrolysis of the precipitation of vanadium to obtain solid-phase red cake and precipitation of vanadium and chromium. Vanadium after solution;

[0065] (2) Calcification reaction: According to the molar ratio of Ca / V being 1.9, mix the red cake and calcium oxide obtained in step (1) into water for calcification reaction, control the reaction temperature to 85°C, and the reaction time to 1.5h, filter Finally, solid-phase calcium vanadate is obtained, and the obtained calcium vanadate is converted into ammonium, impurity removal, crystallization, and calcined to obtain vanadium pentoxide;

[0066] (3) Enrichment of chromium: add polyferric chloride to the solution after the vanadium precipitation obtained in step (1), adjust the pH to 4.5 to carry out the secondary vanadiu...

Embodiment 3

[0070] (1) Hydrolysis of vanadium precipitation: add hydrochloric acid to the vanadium-chromium solution containing 24.5g / L of vanadium and 568.2mg / L of chromium to adjust the pH to 1.6, and then filter after hydrolysis of the precipitation of vanadium to obtain solid-phase red cake and precipitation of vanadium and chromium. Vanadium after solution;

[0071] (2) Calcification reaction: According to the molar ratio of Ca / V of 1.3, mix the red cake obtained in step (1) and calcium oxide into water for calcification reaction, control the reaction temperature to 75°C, and the reaction time to 2h, after filtration Obtain solid-phase calcium vanadate, and obtain vanadium pentoxide through ammonification, transsolution, impurity removal, crystallization and calcination of the obtained calcium vanadate;

[0072](3) Enrichment of chromium: add polyferric chloride to the liquid after the vanadium precipitation obtained in step (1), adjust the pH to be 5.2 and carry out the secondary va...

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Abstract

The invention relates to a method for utilizing a chrome-vanadium solution to produce a vanadium product and chromium sulfate basic. Through the steps of hydrolysis vanadium depositing, a calcification reaction, enriching of chrome, preparing of chromium sulfate basic and the like, a high-purity vanadium product and a chromium sulfate basic product are obtained, the concentration of the obtain vanadium product can reach 99.5% or above, the content of Cr2O3 in chromium sulfate basic can reach 24-26%, the content of a sundry Fe is smaller than 0.1%, the recovery rate of chrome and vanadium can reach 99.5% or above, and the purposes of efficiently extracting and separating chrome and vanadium are achieved. The production process is clean, saline water and NaOH mother liquor generated in the preparing process can return to a system for use, and no ammonia-nitrogen wastewater is generated in the whole process. The technology is feasible, the equipment is simple, the production cost is low,the automation is easy to implement, the economic benefit is high, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, and in particular relates to a method for cleanly producing vanadium products and basic chromium sulfate by using a vanadium-chromium solution. Background technique [0002] Vanadium and chromium are important strategic resources. Because of their similar properties, they usually exist in vanadium-chromium magnetite in a symbiotic manner. Vanadium-chromium magnetite is smelted in blast furnace, vanadium is extracted in converter and other processes to obtain chromium-containing vanadium slag. Vanadium slag sodium roasting vanadium extraction is the mainstream vanadium extraction process used in vanadium production at home and abroad. Vanadium slag undergoes steps such as sodium roasting, leaching, and solution purification to obtain vanadium-chromium solution systems with different concentrations. Since the properties of vanadium-chromium aqueous solutions are si...

Claims

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Application Information

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IPC IPC(8): C01G37/08C01G31/02C22B3/44C22B34/22C22B34/32
CPCC01G31/02C01G37/08C01P2006/80C22B3/44C22B34/22C22B34/32Y02P10/20
Inventor 赵备备李兰杰祁健陈华刘静闫浩
Owner HEBEI IRON AND STEEL
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