A method for regenerating carbonaceous waste from an aluminum electrolytic cell into a raw material for the production of calcium carbide

Abstract

The invention provides a method for regenerating aluminum electrolysis cell carbon-base waste into a raw material for calcium carbide production. The method comprises the following steps that (1) the aluminum electrolysis cell carbon-base waste is broken; (2) the broken aluminum electrolysis cell carbon-base waste is placed into a leaching pond, a stirring leaching device or a rolling mixing leaching device, water is added firstly, then caustic soda or a solution of the caustic soda, quick lime and a drastic oxidation active agent are added, oxidization leaching is conducted, filtering separating is conducted, an aluminum alkali solution and solid filter residues are obtained, and after the solid filter residues are washed with water and dried, activated carbon residues containing carbon and calcium fluoride are obtained; and (3) the activated carbon residues are placed into a rolling mixing machine, a hydrocarbon binder is added, or quick lime is further added, rolling mixing and forming are conducted, and the raw material for calcium carbide production is obtained. According to the method for regenerating the aluminum electrolysis cell carbon-base waste into the raw material for calcium carbide production, the obtained raw material for calcium carbide production is high in carbon content, low in impurity content and high in aluminum and alkali desorption recovering rate; the obtained raw material for calcium carbide production is applied to calcium carbide production, the yield is increased, the average power consumption of calcium carbide of per ton is reduced, the calcium carbide gas yield is increased, and no cyanide is detected; and the method is safe, simple, large in processing quantity and low in energy consumption and cost.

Description

technical field [0001] The invention relates to a method for regenerating carbon waste from an aluminum electrolytic cell, in particular to a method for regenerating carbon waste from an aluminum electrolytic cell into raw materials for producing calcium carbide. Background technique [0002] At present, the output of electrolytic aluminum in my country and the world is developing rapidly. According to statistics, by the end of December 2016, the aluminum smelting enterprises of electrolytic aluminum in my country had built a production capacity of 43.698 million tons, and the operating production capacity had reached 36.739 million tons. With the increase of electrolytic aluminum production, the solid waste produced in the electrolysis process, such as waste cathode carbon, waste anode carbon particles, waste refractory bricks, waste insulation bricks, and waste insulation slag, has also increased rapidly, of which only my country's electrolytic aluminum The annual waste ca...