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Method for preparing silicon-iron alloy by using aluminum ash as raw material and feeding material by hollow electrode

A technology of hollow electrode and ferrosilicon alloy, which is applied in the field of electrometallurgy, can solve the problems that resource utilization is still in the research stage

Active Publication Date: 2019-08-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] From the above analysis, it can be seen that the hazardous waste and solid waste generated in the current electrolytic aluminum, aluminum processing and power industries are treated separately, most of which are in the stage of harmless treatment, and effective resource utilization is still in the research stage. As a result, the environmental pollution problems of these solid wastes have not been fundamentally solved

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  • Method for preparing silicon-iron alloy by using aluminum ash as raw material and feeding material by hollow electrode
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  • Method for preparing silicon-iron alloy by using aluminum ash as raw material and feeding material by hollow electrode

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Embodiment 1

[0043] The method for preparing ferrosilicon alloy by feeding aluminum ash as a raw material hollow electrode comprises the following steps:

[0044] Step 1, making aluminum ash, waste cathode carbon block, fly ash and diatomite waste slag in aluminum electrolytic cell overhaul slag into powder respectively, and the particle size is all less than 100 mesh;

[0045] Step 2, according to the composition of the target aluminum-silicon-ferroalloy: 28% aluminum content, 61% silicon content, and the rest are iron, calcium, titanium and other trace metals, using the fixed carbon contained in the waste cathode carbon block as the reducing agent according to chemical The metering ratio is used to calculate the mass of secondary aluminum ash, spent cathode carbon block, fly ash and diatomite waste slag required for the reduction of metal oxides, wherein the metal aluminum in the secondary aluminum ash is calculated as if all of it enters the Al-Si-Fe alloy, and the nitriding All the alu...

Embodiment 2

[0049] The method for preparing ferrosilicon alloy by feeding aluminum ash as a raw material hollow electrode comprises the following steps:

[0050] Step 1, making aluminum ash, waste cathode carbon block, fly ash and diatomite waste slag in aluminum electrolytic cell overhaul slag into powder respectively, and the particle size is all less than 100 mesh;

[0051] Step 2, according to the composition of the target aluminum-silicon-ferroalloy: the aluminum content is 35%, the silicon content is 54%, and the rest is iron, calcium, titanium and other trace metals; the fixed carbon contained in the waste cathode carbon block is used as the reducing agent according to the chemical The metering ratio is used to calculate the mass of secondary aluminum ash, spent cathode carbon block, fly ash and diatomite waste slag required for the reduction of metal oxides, wherein the metal aluminum in the secondary aluminum ash is calculated as if all of it enters the Al-Si-Fe alloy, and the nit...

Embodiment 3

[0055] The method for preparing ferrosilicon alloy by feeding aluminum ash as a raw material hollow electrode comprises the following steps:

[0056] Step 1, making aluminum ash, waste cathode carbon block, fly ash and diatomite waste slag in aluminum electrolytic cell overhaul slag into powder respectively, and the particle size is all less than 100 mesh;

[0057] Step 2, according to the composition of the target aluminum-silicon-ferroalloy: 43% aluminum content, 47% silicon content, and the rest are iron, calcium, titanium and other trace metals; the fixed carbon contained in the waste cathode carbon block is used as the reducing agent according to the chemical The metering ratio is used to calculate the mass of secondary aluminum ash, spent cathode carbon block, fly ash and diatomite waste slag required for the reduction of metal oxides, wherein the metal aluminum in the secondary aluminum ash is calculated as if all of it enters the Al-Si-Fe alloy, and the nitriding All t...

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Abstract

The invention provides a method for preparing a silicon-iron alloy by using aluminum ash as a raw material and feeding material by a hollow electrode. According to the method, secondary aluminum ash is used as a raw material, an aluminum electrolysis cell waste cathode carbon block serves as a reducing agent, fly ash serves as an additive to adjust the content of aluminum in the raw materials, diatomaceous earth waste residues serve as additives to adjust the content of silicon in the raw materials, and high-temperature reduction in an electric arc furnace takes aluminum oxide and silicon oxide as main materials so as to prepare a certain-component aluminum-silicon-iron alloy; the hollow electrode is used for conveying powdery materials, so that the smelting process of the whole electric arc furnace can be enhanced, reduction of oxides and volatilization of fluoride are promoted, particularly, decomposition of the toxic substance aluminum nitride and the cyanide is accelerated, the production efficiency is improved, the production cost is reduced, and comprehensive utilization of various dangerous waste and solid waste is realized in the same process.

Description

technical field [0001] The invention relates to the field of electrometallurgy, in particular to a method for preparing ferrosilicon alloy by feeding a hollow electrode with aluminum ash as a raw material. Background technique [0002] The production methods of aluminum silicon ferrosilicon are mainly divided into metal melting method and electrothermal reduction method. The metal melting method is to use pure metal aluminum, silicon, and iron to form alloys in a molten state according to a certain proportion; the electrothermal reduction method uses oxides containing aluminum, silicon, and iron as raw materials, and carbonaceous materials as raw materials. The reducing agent is used to prepare the alloy through reduction smelting in an electric arc furnace. Among them, the metal fusion method has problems such as reheating of pure metal, secondary burning loss and high production cost. The electrothermal reduction method also has problems such as shortage of pure mineral ...

Claims

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Application Information

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IPC IPC(8): C22B4/06C22B5/10C22B7/00C22B7/02C22C21/02C22C28/00C25C3/18
CPCC22B4/06C22B5/10C22B7/001C22B7/02C22C21/02C22C28/00C25C3/18Y02P10/20
Inventor 罗洪杰王耀武吴林丽高国磊曲杨
Owner NORTHEASTERN UNIV
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