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Method for preparing high-purity iron through high-temperature fused salt electrodeposition

A high-temperature molten salt and electrodeposition technology, applied in the new field of metallurgy, can solve the problems of limited electrochemical window, long production cycle, low reaction rate, etc., and achieve the effect of controllable electrolysis process, short process and simple operation process

Pending Publication Date: 2022-03-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical purification preparation methods mainly include zone smelting, cold crucible smelting, vacuum induction smelting, etc.; but the production cycle is long and the efficiency is low
Chemical purification preparation methods mainly include solvent extraction method, ion exchange method, membrane separation method, etc. After purification, high-purity iron salt melt is obtained, and then high-purity iron is obtained through low-temperature electrochemical refining method, but the reaction rate involved in these methods Low temperature aqueous solution has problems such as hydrogen evolution and limited electrochemical window

Method used

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  • Method for preparing high-purity iron through high-temperature fused salt electrodeposition
  • Method for preparing high-purity iron through high-temperature fused salt electrodeposition
  • Method for preparing high-purity iron through high-temperature fused salt electrodeposition

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Effect test

Embodiment 1

[0033] The flow chart of the present invention prepares high-purity iron material sees figure 1 , 100g CaCl 2 , 4.0gFe 2 o 3 , 4.0g CaO was added to the high-purity corundum crucible, the temperature was raised to 400°C under the high-purity argon atmosphere, and the temperature was kept for 5 hours. The structure of the electrolytic cell is as follows figure 2 Shown, then heated to 850 ℃, insulation 12h. figure 2 Mark 1-gas inlet, 2-anode lead, 3-cathode lead, 4-gas outlet, 5-high temperature resistance furnace, 6-anode, 7-cathode, 8-crucible, 9-CaCl 2 -Fe 2 o 3 -CaO molten salt system. Put two high-purity carbon rods as the anode and cathode into the crucible for pre-electrolysis. The pre-electrolysis voltage is 2.0V and the time is 12h. After standing for 12h, repeat the pre-electrolysis process 3 times. Then, cyclic voltammetry test was carried out, and the test results were as follows: image 3 As shown, it can be seen that ferrite ion oxidation peak and iron re...

Embodiment 2

[0035] The implementation of this case is roughly the same as in Example 1, but a constant voltage of 2.0V is used for deposition, and the microscopic morphology and EDS energy spectrum of the obtained high-purity iron product are as follows Figure 6 As shown, it can be seen that the constant voltage electrodeposition mode is more likely to form iron grains and less likely to form iron films.

Embodiment 3

[0037] 100gCaCl 2 , 4.0gFe 2 o 3 1. Add 4.0g CaO into the high-purity corundum crucible, raise the temperature to 400°C under high-purity argon atmosphere, and keep it warm for 5h. Then it was heated to 850°C under high-purity argon atmosphere and kept for 12 hours. Two high-purity carbon rods were used as anode and cathode, and put into a crucible for pre-electrolysis. The pre-electrolysis voltage was 2.5V and the time was 12h. After the pre-electrolysis finishes, then re-put into a high-purity carbon rod as the anode of the electrolytic cell, use the high-purity carbon rod in the pre-electrolysis process as the substrate of the electrolytic cell cathode, that is, the product, carry out electrodeposition, and apply 0.08A (current The density is 15mA / cm 2 ) continuous constant current deposition for 5 hours, the obtained surface morphology is as follows Figure 7 As shown, it can be seen that the grown iron film is dense and has no holes. The cross-sectional topography a...

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Abstract

The invention discloses a method for preparing high-purity iron through high-temperature fused salt electrodeposition, and relates to the field of new metallurgical technologies and high-purity material preparation. According to the method, CaCl2-Fe2O3-CaO is adopted as a fused salt system, and the high-purity iron material is obtained through fused salt electrodeposition growth under the conditions of constant current and constant voltage and the argon inert atmosphere of 850 DEG C. The method is simple to operate, and the high-purity iron can be directly prepared from the iron oxide raw material in one step in a short process. By controlling the current, the voltage and the time, the shape, the thickness and the like of the high-purity iron can be regulated and controlled. According to the method, high-purity iron can be continuously prepared in a mode of periodically supplementing raw materials, the preparation efficiency is improved, and the method has the advantages of being short in process, low in energy consumption and the like.

Description

technical field [0001] The invention relates to the field of new metallurgical technology, in particular to a method for preparing high-purity iron by high-temperature molten salt electrodeposition. Background technique [0002] In recent years, with the development of science and technology, the purity and performance of traditional industrial pure iron and atomized iron powder can no longer meet the needs of various high-tech industries. High-purity iron has good ductility, soft magnetic properties, electrical conductivity, thermal properties and corrosion resistance. At present, the methods for preparing high-purity iron products are mainly divided into physical purification preparation methods and chemical purification preparation methods. Physical purification preparation methods mainly include zone smelting, cold crucible smelting, vacuum induction smelting, etc.; however, the production cycle is long and the efficiency is low. Chemical purification preparation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34
CPCC25C3/34
Inventor 邹星礼李金键张学强李想庞忠亚汪淑娟熊晓璐李光石许茜鲁雄刚
Owner SHANGHAI UNIV
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