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Method for preparing aluminum-silicon-iron alloy from high-aluminum coal gangue and conducting graded purification

A technology of high-alumina coal gangue and ferrosilicon alloy, which is applied in the fields of metallurgy and the environment, can solve problems such as shortage of bauxite resources and waste of resources, and achieve the effects of alleviating the shortage of bauxite resources, reducing iron content, and improving production efficiency

Pending Publication Date: 2022-01-11
内蒙古君成科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention realizes the comprehensive utilization of all elements of aluminum, silicon and iron resources in high-alumina coal gangue, can effectively reduce the iron content in Al-Si-Fe alloy, and obtain Al-Si alloy for casting with higher added value and meeting market demand. The deoxidizer uses aluminum silicon ferroalloy and pickling to remove impurities as industrial silicon for the production of solar-grade polysilicon. There is no new solid waste discharge, which solves the problem of resource waste and environmental pollution caused by long-term stacking of high-alumina coal gangue, and alleviates my country's bauxite. The problem of shortage of mineral resources has a wide range of industrial application prospects

Method used

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  • Method for preparing aluminum-silicon-iron alloy from high-aluminum coal gangue and conducting graded purification
  • Method for preparing aluminum-silicon-iron alloy from high-aluminum coal gangue and conducting graded purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing aluminum-silicon-ferroalloys by using high-alumina coal gangue and refining them step by step, the process flow chart is as follows figure 2 shown, including the following steps:

[0037] Crush 1 ton of high-alumina coal gangue and coal until the particle size is less than 100 mesh, and mix uniformly to form a mixed material, in which Al 2 o 3 The mass fraction is 48.32%, SiO 2 The mass fraction is 46.54%, Fe 2 o 3 The mass fraction is 0.63%, and the carbon content of the coal is 90% of the carbon content required for the complete reaction of the metal oxides and carbon in the coal gangue, and then sequentially add 6% of the mixed material mass of sulfurous acid pulp binder and 10% of water to carry out Mix the materials, and then make the mixed materials into pellets in the pellet machine, the pellet making pressure is 100MPa, dry and dehydrate the prepared pellets at 120°C to obtain dry pellets, the water content should not exceed 1%; Then...

Embodiment 2

[0040] A method for preparing aluminum-silicon-ferroalloys by using high-alumina coal gangue and refining them step by step, the process flow chart is as follows figure 2 shown, including the following steps:

[0041] Crush 1 ton of high-alumina coal gangue and coal until the particle size is less than 100 mesh, and mix uniformly to form a mixed material, in which Al 2 o 3 The mass fraction is 48.32%, SiO 2 The mass fraction is 46.54%, Fe 2 o 3 The mass fraction is 0.63%, and the carbon content of the coal is 90% of the amount of carbon required for the complete reaction of the metal oxide and carbon in the coal gangue, and then sequentially add 6% of the mixed material mass of sulfurous acid pulp binder, 10% of water Carry out mixing, and then make the mixed materials into pellets in the pellet machine, the pelletizing pressure is 100MPa, dry and dehydrate the prepared pellets at 120°C to obtain dry pellets, the moisture content should not exceed 1% ; Then put the dry m...

Embodiment 3

[0044] A method for preparing aluminum-silicon-ferroalloys by using high-alumina coal gangue and refining them step by step, the process flow chart is as follows figure 2 shown, including the following steps:

[0045] 1 ton of high-alumina coal gangue and coal are crushed to a particle size of less than 100 mesh, and mixed uniformly to form a mixed material, in which the coal gangue is composed of Al 2 o 3 The mass fraction is 48.32%, SiO 2 The mass fraction is 46.54%, Fe 2 o 3 The mass fraction is 0.63%, and the carbon content of the coal is 90% of the amount of carbon required for the complete reaction of the metal oxide and carbon in the coal gangue, and then sequentially add 6% of the mixed material mass of sulfurous acid pulp binder, 10% of water Carry out mixing, and then make the mixed materials into pellets in the pellet machine, the pelletizing pressure is 100MPa, dry and dehydrate the prepared pellets at 120°C to obtain dry pellets, the moisture content should n...

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Abstract

The invention discloses a method for preparing an aluminum-silicon-iron alloy from high-aluminum coal gangue and conducting graded purification. The method comprises the following steps of (1) crushing the high-aluminum coal gangue and a carbonaceous reducing agent, adding a binder and water, uniformly mixing, pelletizing, drying to obtain a dry block mass, and conducting reducing reaction to obtain a molten mass of the aluminum-silicon-iron alloy; (2) casting the molten mass in a mold, and controlling the cooling speed and time to obtain a first-grade aluminum-silicon-iron alloy block; (3) loading the alloy block into a supergravity centrifugal device capable of heating, conducting low-temperature heating, under the action of supergravity, making molten liquid pass through a porous filter plate and then cooling and solidifying to obtain aluminum-silicon alloy, wherein molten slag is a secondary aluminum-silicon-iron alloy block; and (4) continuing heating the alloy block to the high temperature, under the effect of supergravity, making the molten liquid pass through the porous filter plate and then cooling and solidifying to obtain aluminum-silicon-iron alloy, wherein molten slag is industrial silicon or aluminum-silicon alloy. According to the method, comprehensive utilization of aluminum, silicon and iron resources in the coal gangue is realized, and a plurality of products which are higher in additional value and accord with market requirements are obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and environment, and in particular relates to a method for preparing aluminum-silicon-ferroalloy from high-alumina coal gangue and classifying and purifying it. Background technique [0002] Coal gangue is a mixed rock of organic compounds and inorganic minerals co-deposited with coal during the coal-forming process, and is extracted together with coal during coal mining. Relevant data show that the output of coal gangue accounts for about 10% of coal output, and the cumulative stock of coal gangue in my country has reached more than 7 billion tons. At present, large-scale comprehensive utilization has not been carried out, occupying farmland, causing pollution to the environment, and spontaneous combustion occurs in long-term stacking, generating harmful gases and causing serious pollution to the environment. Coal gangue contains a large amount of alumina and silica, among which high-alumina ...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22C1/02C22B1/248
CPCC22B9/02C22B9/023C22C1/026C22B1/248Y02P10/20
Inventor 魏存弟陈禹材徐少南程妍
Owner 内蒙古君成科技有限公司
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