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Method for preparing iron silicon from molten salt electric deoxidised copper slag

A technology of molten salt electric deoxidation and molten salt electrolyte is applied in the field of copper slag resource utilization, which can solve the problems that elements cannot be fully utilized, easily pollute groundwater, damage soil environment, etc., so as to improve electron transfer efficiency and realize efficient comprehensive recovery. Utilization, the effect of low reaction temperature

Pending Publication Date: 2021-08-31
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct use of copper slag in the manufacture of building materials has the problem of low added value and the problem that the valuable elements contained in it cannot be fully utilized
Therefore, the disposal of copper slag becomes a serious economic problem as the production time goes by
In addition, since most of the copper slag is stacked in the open air in the tailings pond, land resources are occupied, which also poses a huge challenge to the comprehensive utilization of land.
Secondly, the harm to the environment is also a severe test. After weathering, rain and surface penetration, heavy metals and other harmful substances can easily pollute groundwater and damage the soil environment

Method used

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  • Method for preparing iron silicon from molten salt electric deoxidised copper slag
  • Method for preparing iron silicon from molten salt electric deoxidised copper slag
  • Method for preparing iron silicon from molten salt electric deoxidised copper slag

Examples

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Effect test

Embodiment 1

[0033] Example 1 A method for preparing iron-silicon from molten salt electro-deoxidation copper slag

[0034] This embodiment includes the following steps:

[0035] S1, placing copper slag in a ball mill and performing mechanical ball milling for 10 hours at a speed of 150 rpm to obtain copper slag powder with a particle size of 15 μm to 25 μm;

[0036] S2, take 0.2kg copper slag powder and carry out magnetic separation treatment under the electric current of 1.0A, obtain 0.126kg magnetic separation tailings, get 0.0008kg magnetic separation tailings and press into sheet under 10MPa pressure condition and prepare as cathode sheet, and Under the protection of an inert gas, the cathode sheet was sintered at a temperature of 800°C for 5 hours, and the cathode sheet was wrapped with a metal iron mesh cloth and fixed on the iron rod of the cathode current collector with an iron wire;

[0037] S3, 0.18kg of electrolyte CaCl with a molar ratio of 1:1 2 , NaCl was dried in a drying...

Embodiment 2

[0041] Example 2 A method for preparing iron-silicon from molten salt electro-deoxidation copper slag

[0042] This embodiment includes the following steps:

[0043] S1, placing copper slag in a ball mill and performing mechanical ball milling for 6 hours at a speed of 180 rpm to obtain copper slag powder with a particle size of 15 μm to 25 μm;

[0044] S2, take 0.32kg copper slag powder and carry out magnetic separation process under the electric current of 1.1A, obtain 0.184kg magnetic separation tailings, get 0.0008kg magnetic separation tailings and press into sheet under 15MPa pressure condition and prepare as cathode sheet, and Under the protection of inert gas, the cathode sheet was sintered at a temperature of 700°C for 5 hours, and the cathode sheet was wrapped with metal iron mesh cloth and fixed on the cathode current collector iron rod with iron wire;

[0045] S3, 0.18kg of electrolyte CaCl with a molar ratio of 1:1 2, NaCl was dried in a drying oven at 230°C for...

Embodiment 3

[0049] Example 3 A method for preparing iron-silicon from molten salt electro-deoxidation copper slag

[0050] This embodiment includes the following steps:

[0051] S1, placing the copper slag in a ball mill for 8 hours of mechanical ball milling at a speed of 200 rpm to obtain copper slag powder with a particle size of 15 μm to 25 μm;

[0052] S2, take 0.2kg copper slag powder and carry out magnetic separation process under the electric current of 1.2A, obtain 0.121kg magnetic separation tailings, get 0.0008kg magnetic separation tailings and press into sheet under 13MPa pressure condition and prepare as cathode sheet, and Under the protection of an inert gas, the cathode sheet was sintered at a temperature of 800°C for 5 hours, and the cathode sheet was wrapped with a metal iron mesh cloth and fixed on the iron rod of the cathode current collector with an iron wire;

[0053] S3, 0.18kg of electrolyte CaCl with a molar ratio of 1:1 2 , NaCl in a drying oven at 240°C for 26...

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Abstract

The invention belongs to the field of copper slag resource utilization, and discloses a method for preparing iron silicon from molten salt electric deoxidised copper slag. The method comprises the following steps of firstly, carrying out mechanical ball milling treatment on the copper slag to obtain copper slag powder; carrying out magnetic separation treatment on the copper slag powder to obtain magnetic separation tailings, pressing the magnetic separation tailings into sheets to prepare cathode sheets, and sintering the cathode sheets under the protection of inert gas; under the protection of the inert gas, enabling electrolyte to be pretreated to obtain molten salt electrolyte, and placing the cathode sheets in the molten salt electrolyte for electrolysis; and under the protection of the inert gas, taking out a cathode product after electrolysis, cooling to room temperature, washing, and carrying out vacuum drying to obtain an iron-silicon-based alloy. According to the method, comprehensive recycling of metal iron and silicon resources in the copper slag can be achieved, the operation process is simple, compared with the prior art, the recycling cost is reduced, no harmful gas is discharged, and the product purity is high.

Description

technical field [0001] The invention belongs to the field of resource utilization of copper slag, and in particular relates to a method for preparing iron-silicon from molten salt electro-deoxidation copper slag. Background technique [0002] Copper slag is a non-ferrous metal slag produced in the copper smelting process, mainly metal oxides and silicate minerals. Among them, the metal oxides are mainly: Fe 3 o 4 、Al 2 o 3 , CaO, MgO, ZnO, silicate minerals are mainly Fe 2 SiO 4 . Among them, Fe and Si have the highest content. Fe and Si are the most widely used elements in daily life, so the effective recovery of valuable elements in copper slag is of great significance for the high value-added utilization of copper slag. [0003] At present, the utilization technology of copper slag resources is applied to the preparation of cement, preparation of concrete and mortar, preparation of abrasive materials, production of bricks and insulation boards, production of cast ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36C22B7/00
CPCC25C3/36C22B7/005Y02P10/20
Inventor 李慧梁精龙杨佳兴严红燕薛超龙李晨晓王乐曹卫刚
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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