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Method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium

A rough and high-carbon technology, applied in the fields of metallurgy, chemical industry, and molten salt electrolysis, can solve the problems of harsh equipment requirements, serious pollution, poor safety, etc., and achieve the effects of reducing stringent requirements, wide adaptability of raw materials, and low operation difficulty

Active Publication Date: 2019-08-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liu Wei et al. made a review based on molten salt electrolysis technology refining in "Molten Salt Electrolytic Refining of High-Carbon Ferroalloys to Prepare Pure Ferroalloy Process Optimization Analysis", in which the description of vanadium metal uses vanadium carbide as raw material, but needs to use chlorine gas to prepare VCl 2 , and added to the molten salt, the preparation process is seriously polluted, poor in safety, and has strict requirements on equipment; while the refining process for ferroalloys is to achieve co-deposition between metals and dissolution of impurity elements, etc., which is similar to refining pure metals in terms of mechanism have essential difference

Method used

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  • Method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium
  • Method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium
  • Method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium

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Embodiment 1

[0024] In terms of mass fraction, take the crude miscellaneous vanadium raw material whose V content is 70.8%, C content is 18.5%, O content is 5.5%, Al content is 1.5%, Si content is 2.2%, and other impurity element content is 1.5%. Under pressure, the sample is pressed into a φ5mm×5mm sample under a high-pressure molding press, and 25 coarse vanadium blocks are placed in a nickel mesh hanging basket with a porosity of 0.212mm; NaCl and KCl eutectic salts are selected as electrolytes, and molybdenum sheets are used as cathodes. 0.75A / cm at 650°C 2 Electrolyze at a current density of 90 minutes, then continue to electrolyze at a constant potential of 0.2V for 25 hours, then lift the cathode and anode. After the furnace temperature is cooled to room temperature, the cathode product is ultrasonically treated for 10 minutes, and then washed repeatedly with dilute hydrochloric acid and deionized water for 5 minutes. Metallic vanadium with a purity of 99.5% was obtained after the s...

Embodiment 2

[0026] In terms of mass fraction, take the crude miscellaneous vanadium raw material whose V content is 75%, C content is 5%, O content is 14.0%, Al content is 3.0%, Si content is 2.0%, and other impurity element content is 2.0%, at 100MPa Under pressure, the sample is pressed into a φ5mm×5mm sample under a high-pressure molding press, and 30 pieces of coarse vanadium blocks are placed in a molybdenum mesh hanging basket with a porosity of 0.075mm; CsCl, KCl, and MgCl salts are selected as electrolytes, and nickel sheets are used as cathodes. 1.1A / cm at 750°C 2 Electrolyze at a current density of 65 minutes, then continue to electrolyze at a constant potential of 0.65V for 30 hours, then lift the cathode and anode. After the furnace temperature cools down to room temperature, the cathode product is ultrasonically treated for 110 minutes, and then washed repeatedly with dilute hydrochloric acid and deionized water for 5 minutes. Metallic vanadium with a purity of 99.9% was obta...

Embodiment 3

[0028] In terms of mass fraction, take the crude miscellaneous vanadium raw material whose V content is 67.4%, C content is 14.3%, O content is 14.5%, Al content is 2.6%, Si content is 1.1%, and other impurity element content is 0.1%. Under pressure, the sample is pressed into a φ5mm×5mm sample under a high-pressure molding press, and 45 coarse vanadium blocks are placed in a nickel mesh hanging basket with a porosity of 0.18mm; LiCl and KCl eutectic salts are selected as electrolytes, and molybdenum sheets are used as cathodes. 0.5A / cm at 500°C 2 Electrolyze at a current density of 170min, then continue to electrolyze at a constant potential of 0.8V for 30h, then lift the cathode and anode, after the furnace temperature is cooled to room temperature, ultrasonically treat the cathode product for 100min, and then wash it repeatedly with dilute hydrochloric acid and deionized water for 5 times Finally, metal vanadium with a purity of 99.8% is obtained.

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Abstract

The invention provides a method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium, and belongs to the field of metallurgy chemical engineering. The method for refining high-purity metal vanadium through high-carbon rough and mixed vanadium comprises the following process that after rough vanadium is pretreated and an electrode is prepared, constant-current electrolysis is conducted in fuse salt for 30 min-300 min with the current of 0.1-1.5 A / cm<2>, then, the cell voltage of 0.2-1.5 V is adopted for continuous electrolysis for not shorter than 10 h till metalis obtained through cathode deposition, a product is subjected to posttreatment, and pure metal vanadium is obtained. According to the method, the manner of combination of constant-current pre-electrolysis salt preparing and constant-voltage electrolytic refining is adopted, pure metal vanadium is obtained on a cathode, the high-carbon rough and mixed vanadium can be refined, raw material adaptability is wide, impurities brought into the link in the electrolysis process are reduced, and the purity of the refined product is high. According to the method, in the refining process, high-risk andcomplex operation during traditional salt making through chlorine is simplified, the strict requirement for equipment is lowered, and the electrolysis process is green and sustainable.

Description

technical field [0001] The invention relates to a method for refining high-purity metal vanadium with high-carbon coarse vanadium, which belongs to the field of metallurgy and chemical industry, and specifically relates to the field of molten salt electrolysis. Background technique [0002] With the continuous development of my country's industrial technology, breaking through the bottleneck of the industry has gradually become an urgent problem to be solved in all walks of life in our country. Pure metals, especially vanadium metal, have broad applications in aerospace, electronic information, marine exploration and new materials. For example, high-purity vanadium foil is the best shielding material. The source of vanadium metal in my country is mainly based on the smelting of vanadium-titanium magnetite, which is a low-grade compound paragenetic ore, which is difficult to mine and smelt. The traditional smelting processes for high-quality pure metal vanadium mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/26
CPCC25C3/26
Inventor 王明涌陈云飞焦树强
Owner UNIV OF SCI & TECH BEIJING
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