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A method for purifying vanadyl sulfate by melting 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: 2022-03-04
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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  • A method for purifying vanadyl sulfate by melting 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 by melt crystallization, which belongs to the technical fields of chemical industry and materials. The low-purity vanadyl sulfate raw material is first heated to a molten state, and the primary crystallization and primary filtration are performed to obtain the crude vanadyl sulfate crystal product and the crystallization raffinate, and then the crude vanadyl sulfate crystal product is sweated and purified and centrifugally filtered to obtain a high-purity Vanadyl sulfate product and sweat raffinate, finally collect and cool the above-mentioned crystallization raffinate and sweat raffinate to obtain crude vanadyl sulfate by-product. The whole process does not use other fluxes, avoiding secondary pollution. The melt crystallization method of the present invention comprises two stages of crystallization purification and sweat purification, which can remove high melting point and low melting point impurities in vanadyl sulfate step by step, combined with centrifugal filtration after sweat purification, can effectively separate high-purity vanadyl sulfate crystallization products, It avoids inclusions, entrapment, and impurity residues adhering to the inside and surface of the crystallization product, reduces the cost, and shortens the process; achieves the purpose of high efficiency, cleanliness, and energy-saving purification.

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 Patents(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