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Method for purifying vanadyl sulfate through melt crystallization

A technology of vanadyl sulfate and molten crystallization, which is applied in the fields of chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of high cost, lengthy and complicated process of purifying vanadyl sulfate, etc., so as to reduce the preparation cost and avoid secondary The effect of reducing secondary pollution and shortening the process

Active Publication Date: 2021-05-11
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for purifying vanadyl sulfate by melting and crystallizing for the problems of lengthy, complicated and high-cost purification process flow of vanadyl sulfate in the prior art. Crude vanadyl sulfate is obtained by crystallization and separation, and then purified by sweating and centrifugal filtration to obtain high-purity vanadyl sulfate

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  • Method for purifying vanadyl sulfate through melt crystallization

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Embodiment 1

[0031] combine figure 1 As shown, a kind of two-stage melt crystallization method of separating vanadyl sulfate of the present embodiment, its steps are: the vanadyl sulfate raw material is first heated to molten state, carries out primary crystallization and primary filtration to obtain crude vanadyl sulfate crystalline product and crystal raffinate, then the crude vanadyl sulfate crystallization product is sweated and purified and centrifuged to obtain high-purity vanadyl sulfate product and sweat raffinate, and finally the above-mentioned crystal raffinate and sweat raffinate are collected and cooled to obtain crude vanadyl sulfate by-product. The specific steps are:

[0032] Step 1: Melting

[0033] Heating the vanadyl sulfate to a temperature of 105°C, and keeping it at this temperature for 30 minutes to obtain a molten liquid;

[0034] The second step: crystallization and purification

[0035] Cool the melt obtained in step 1 to a temperature of 104°C at a cooling ra...

Embodiment 2

[0041] combine figure 1 As shown, a kind of two-stage melt crystallization method of separating vanadyl sulfate of the present embodiment, its steps are: the vanadyl sulfate raw material is first heated to molten state, carries out primary crystallization and primary filtration to obtain crude vanadyl sulfate crystalline product and crystal raffinate, then the crude vanadyl sulfate crystallization product is sweated and purified and centrifuged to obtain high-purity vanadyl sulfate product and sweat raffinate, and finally the above-mentioned crystal raffinate and sweat raffinate are collected and cooled to obtain crude vanadyl sulfate by-product. The specific steps are:

[0042] Step 1: Melting

[0043] Heating the vanadyl sulfate to a temperature of 110°C, and keeping it at this temperature for 60 minutes to obtain a melt;

[0044] The second step: crystallization and purification

[0045] Cool the molten liquid obtained in step 1 to a temperature of 100°C at a cooling ra...

Embodiment 3

[0051] combine figure 1 As shown, a kind of two-stage melt crystallization method of separating vanadyl sulfate of the present embodiment, its steps are: the vanadyl sulfate raw material is first heated to molten state, carries out primary crystallization and primary filtration to obtain crude vanadyl sulfate crystalline product and crystal raffinate, then the crude vanadyl sulfate crystallization product is sweated and purified and centrifuged to obtain high-purity vanadyl sulfate product and sweat raffinate, and finally the above-mentioned crystal raffinate and sweat raffinate are collected and cooled to obtain crude vanadyl sulfate by-product. The specific steps are:

[0052] Step 1: Melting

[0053] Heating the vanadyl sulfate to a temperature of 117°C, and keeping it at this temperature for 105 minutes to obtain a molten liquid;

[0054] The second step: crystallization and purification

[0055] Cool the molten liquid obtained in step 1 to a temperature of 85°C at a c...

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Abstract

The invention discloses a method for purifying vanadyl sulfate through melt crystallization, and belongs to the technical field of chemical engineering and materials. The method comprises the following steps: heating a low-purity vanadyl sulfate raw material to a molten state, carrying out primary crystallization and primary filtration to obtain a crude vanadyl sulfate crystallization product and a crystallization residual liquid, and carrying out sweating purification and centrifugal filtration on the crude vanadyl sulfate crystallization product to obtain a high-purity vanadyl sulfate product and a sweating residual liquid; and finally, collecting and cooling the crystallization residual liquid and the sweating residual liquid to obtain a crude vanadyl sulfate byproduct. No other flux is used in the whole process, so that secondary pollution is avoided. The melt crystallization method comprises two stages of crystallization purification and sweating purification, high-melting-point and low-melting-point impurities in vanadyl sulfate can be removed in stages, centrifugal filtration is combined after sweating purification, a high-purity vanadyl sulfate crystal product can be effectively separated, impurity residual liquid mingled, hidden and adhered to the interior and the surface of the crystal product is avoided, the cost is reduced, and the process is shortened; and the purposes of high efficiency, cleaning and energy-saving purification are achieved.

Description

technical field [0001] The invention relates to the fields of chemical industry and material technology, and more specifically, relates to a method for purifying vanadyl sulfate by melting crystallization. Background technique [0002] Vanadyl Sulfate (VOSO 4 ) is an important industrial vanadium product. It is an important raw material for the preparation of vanadium battery electrolyte and advanced glass manufacturing. It is widely used in chemical industry, materials, new energy, medicine and other fields. At present, vanadyl sulfate is mostly prepared from industrial vanadium pentoxide, which has low quality and high impurity content, and cannot meet the high standard requirements in fields such as batteries. Therefore, how to prepare high-purity vanadyl sulfate with low cost and high efficiency has become one of the keys to the sustainable development of new energy and other fields. [0003] At present, the preparation method of high-purity vanadyl sulfate is mainly b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
CPCC01G31/00
Inventor 张立峰李亚琼杨文任英罗艳王祎段豪剑
Owner UNIV OF SCI & TECH BEIJING