Method for producing ferro-silicon alloy and calcium aluminate material with red mud and aluminum ash

Abstract

The invention relates to a method for preparing ferro-silicon alloy and a calcium aluminate material through utilizing red mud and aluminum ash. The method comprises the following technical proposal: 25 to 70 weight percent of the red mud and 30 to 75 weight percent of the aluminum ash are mixed, are added with 15 to 50 weight percent of a calcic compound or are not added with the calcic compound, are mixed, are put to an electric furnace, are melted and reduced at a temperature of between 1,400 and 1,800 DEG C, are kept at the temperature for 1 to 4 hours and are naturally cooled, broken and separated, to obtain the ferro-silicon alloy and the calcium aluminate material. The method uses the aluminum ash and the red mud as raw materials, utilizes waste and has a simple process and low cost. In the reaction process, metal aluminum and aluminum nitride are utilized as reducing agents; the process is exothermic, thereby reducing electricity consumption, having no emission of CO2 and reducing environmental pollution; and the ferro-silicon alloy and the calcium aluminate material have wide application range and high added values. The prepared calcium aluminate material can be used as a corhart and a raw material for producing calcium aluminate cement and can also be used as premelt slag in steel industry; and the ferro-silicon alloy can be used as a deoxidant and an alloy agent for steelmaking.

Description

technical field [0001] The invention belongs to the technical field of waste comprehensive utilization. Specifically, it relates to a method for preparing ferrosilicon alloy and calcium aluminate material by using red mud and aluminum ash. Background technique [0002] Red mud is solid powdery waste discharged during the production process of alumina smelting industry. Generally, about 1.0-1.7 tons of red mud are produced for every ton of alumina produced. According to incomplete estimates, the world discharges about 60 million tons of red mud every year. my country is the world's fourth largest producer of alumina, and its accumulated red mud stockpile has reached 41 million tons. A large amount of red mud is stored in the open air, occupying farmland and hills, and the dust is flying, causing environmental and air pollution; the pH of the red mud is very high, and its leachate is about 12.1 to 13.0, and the lye in the red mud seeps into the formation with rainwater to ca...

AI Technical Summary

Problems solved by technology

[0011] (4) Refractory materials: The main problem of using aluminum ash to produce refractory materials in China is that the produced refractory materials have high impurity content (CN1541782), and Fe in aluminum ash cannot be effectively removed in the recycling of aluminum ash 2 o 3 , alkali metal oxides and other impurities, so that the regenerated refractories cannot be widely used

[0013] The patented technology of "A Comprehensive Utilization Method of Red Mud" (CN101275182) involves a method of carbon thermal reduction of red mud to produce ferrosilicon alloys and calcium aluminate materials, but carbon heat requires a lot of power consumption; "Using waste aluminum ash to produce aluminum Calcium Acid Method" (CN101172635) relates to a method for synthesizing calcium aluminate by thermal fusion reduction of waste aluminum ash and carbon, but it requires coke as a reducing agent, which is easy to cause carbon inclusion in calcium aluminate