Method for preparing aluminum-silicon-ferrum alloy from coal gangue

Abstract

The invention discloses a method for preparing an aluminum-silion-ferrum alloy from coal gangue, which relates to the technical field of aluminum-silion-ferrum production. The method comprises the following steps of: 1) crushing the raw material coal gangue and a reducing agent bituminous coal, and feeding the crushed material and coal ash ferric microballoons into a mixing mill; 2) adding water into the mixing mill, and mixing and rolling the material; 3) feeding the uniformly mixed and rolled material into a ball press for balling; 4) feeding balls discharged out of the ball press into a drying kiln for drying; 5) feeding the dried balls into a submerged arc furnace, and smelting the balls into molten iron at high temperature; and 6) discharging the molten iron out of the furnace and casting the molten iron into an ingot mould to prepare the aluminum-silion-ferrum alloy. As the coal gangue is mainly adopted as the raw material, the method has the advantages of vast raw material sources, low production cost and low energy consumption; and the prepared low-aluminum high-silicon aluminum-silion-ferrum alloy is applied to steelmaking deoxiders and magnesium-smelting reducing agents and can produce remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of ferrosilicon production, in particular to a method for preparing ferrosilicon alloys from coal gangue. Background technique [0002] Al-Si-Ferroalloy is mainly used as a deoxidizer in steelmaking plants. At present, its production methods include blending method and electrothermal method. The blending method uses aluminum ingots, industrial silicon or ferrosilicon as raw materials, which are remelted and melted and mixed in proportion, which is costly and consumes a lot of energy. The electrothermal method is to use aluminosilicate minerals and add steel shavings or iron-containing ore to directly smelt them with a reducing agent in a submerged arc furnace. The raw materials for aluminum-silicon initial alloy smelting by electrothermal method are mainly aluminosilicate minerals such as bauxite and kaolinite. The current shortage of natural bauxite leads to high raw material costs. Coal gangue is one of ...

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Problems solved by technology

However, in Document 1 and the patent document, the raw materials are directly put into the furnace for smelting without preparing pellets, and there are problems such as inhomogeneous materials in the furnace and slow reaction speed; the raw materials in Document 2 use a large amount of natural bauxite, and use composite clay Binder, higher cost

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