Hazard-free treatment and utilization method for aluminium electrolysis waste slot liner

Abstract

The invention relates to a hazard-free treatment and utilization method for an aluminium electrolysis waste slot liner. The hazard-free treatment and utilization method is characterized by comprising the steps of (1) performing sorting and separating on the aluminium electrolysis waste slot liner based on an aluminium electrolysis waste negative electrode carbon material and a waste fireproof material; (2) performing smashing separately; (3) performing powder grinding separately; (4) measuring content values of cyanogen and fluorine;(5) adding a solid cyanogen removal agent and a solid fluorine removal agent, and performing material mixing; (6) performing a cyanogen removal and fluorine removal and neutral reaction on the waste fireproof material; (7) performing a cyanogen removal and fluorine removal reaction on the waste negative electrode carbon material; (8) pressing and filtering material slurry obtained in the step (6), recycling the filtering liquid, and taking filtering slag for road pavement; and (9) pressing and filtering material slurry obtained in the step (7), recycling the filtering liquid, and taking filtering slag as carbon brick for manufacturing a blast furnace. By adoption of the hazard-free treatment and utilization method, different kinds of waste materials in the waste slot liner are processed, respective optimal technological parameters specific to different kinds of waste materials are selected, and the hazard-free slag can be sorted and reasonably recycled.

Description

technical field [0001] The invention relates to a harmless treatment and utilization method of aluminum electrolysis waste tank lining, which relates to a method for the treatment and recycling of solid hazardous waste in the aluminum electrolysis industry. Background technique [0002] The aluminum electrolytic cell used in the aluminum electrolysis process generally runs for 5-8 years and will be shut down for overhaul due to various reasons. Materials, insulation bricks, calcium silicate boards, other refractory insulation materials, etc., due to the long-term operation of the aluminum electrolytic cell, the above materials will contain sodium fluoride, cryolite, aluminum fluoride, calcium fluoride, alumina, etc. , because it contains soluble fluoride and trace cyanide, it is listed as industrial solid hazardous waste and must be treated innocuously. [0003] With the country's emphasis on environmental protection in recent years, most of the aluminum electrolysis enterp...

AI Technical Summary

Problems solved by technology

Due to the large differences in hardness, toxic ion content and composition of waste cathodes and waste refractory materials, when they are mixed together, not only will the waste refractory materials be over-grinded but the waste cathodes will not be finely ground when they are mixed together. Adding reactants to the reaction chamber will cause problems such as insufficient reaction and poor reaction effect

In addition, due to the different properties of the waste cathode and waste refractory materials, they cannot be used reasonably after harmless treatment.