A kind of preparation method of Al-Si-Fe alloy

Abstract

The invention provides a preparation method of an aluminum-silicon-iron alloy. The method comprises the following steps that: A) aluminum-silicon overhaul slag is pulverized, so that a pulverized material can be obtained, wherein the pulverized material contains 15-20wt% of aluminum, 10-15wt% of silicon and less than or equal to 5wt% of iron; and B) both or either of a waste cathode steel bar andwaste iron slag, aluminum oxide and the pulverized material are mixed, and an obtained mixture is fed into an electrolytic cell so as to be subjected to electrolysis, so that an aluminum-silicon-ironalloy can be obtained, and the superheat degree of an electrolyte for electrolysis is 10-18 DEG C. According to the method of the invention, the aluminum-silicon-iron alloy is prepared by the electrolysis method; and the aluminum-silicon-iron alloy obtained through the method is more stable in chemical property and higher in purity; and the aluminum-silicon-iron alloy is prepared from overhaul slag solid waste which is generated in the electrolytic aluminum industry and harmful to the environment, so that not only is the environmental problem of solid waste stockpiling solved, but also the solid waste is recycled, and direct economic benefits can be brought.

Description

technical field [0001] The invention relates to the technical field of reutilization of aluminum-silicon overhaul slag, in particular to a preparation method of an aluminum-silicon-iron alloy. Background technique [0002] my country is a big aluminum manufacturing country, and the output of alumina and electrolytic aluminum accounts for more than 40% of the world. High-quality bauxite resources are relatively scarce, which is far from meeting the development needs of my country's aluminum industry. More than 50% of bauxite needs to be imported, which seriously restricts the development of my country's aluminum industry. Therefore, actively exploring non-traditional aluminum minerals to produce metal aluminum and developing new aluminum smelting methods is of great significance for increasing the supply of domestic aluminum resources and promoting the sustainable development of the aluminum industry. [0003] With the continuous improvement of national environmental protect...

AI Technical Summary

Problems solved by technology

Use these waste slags as raw materials for carbon electrothermal reduction to prepare aluminum-silicon alloys or aluminum-silicon-iron alloys, and then use aluminum-silicon alloys as raw materials to prepare aluminum-silicon alloys for casting. , but due to the high impurity content in the aluminum-silicon alloy and aluminum-silicon-iron alloy produced by this method, the amount used in the steelmaking process is limited, and the cost of iron removal in the process of making aluminum-silicon alloy for casting is relatively high. The economy is lower than that of ferrosilicon alloy, which limits the application of carbon electrothermal method to treat aluminum-silicon waste slag

[0005] For example, the two patents whose publication numbers are CN1328165A and CN1088622A use waste heavy oil to bond a mixture of aluminum slag powder, iron rust, silica sand, and carbon powder into a block-shaped molding, and then put it into a reaction furnace for high-temperature melting reduction. The process of preparing Al-Si alloy by this method is complicated, and the chemical composition of the prepared Al-Si-Fe alloy is unstable, which affects its use effect, causes waste of energy, and has a high burning loss rate

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