Method and production line for producing ceramic particles by using various hazardous wastes

Abstract

A method and a production line for producing ceramic particles by using various hazardous wastes relate to complete treatment and permanent safety of the hazardous wastes and ceramic particle production, and in particular relate to the method and the production line for producing the ceramic particles by using the various hazardous wastes. A hazardous waste mixture formed by random types of all the various hazardous wastes listed in the national hazardous waste catalogue according to random proportions is ground into slurry by a wet method; the slurry is sufficiently stirred and mixed with clay ground by a dry method and an additive according to certain proportions; the obtained mixture is extruded by a vacuum stirring extruding machine to form high-intensity biscuit particles; the high-intensity biscuit particles are dried, preheated, burn-expanded, sintered and cooled to form the ceramic particles. The clay polluted by the hazardous wastes is adopted; in the mixture of the hazardous wastes, the clay and the additive, a ratio of (SiO2+Al2O3+Fe2O3) to (CaO+MgO) is greater than 2, and meanwhile, a ratio of SiO4 to MgO is greater than 4.

Description

technical field [0001] The technical proposal involves the treatment of various hazardous wastes, the production of ceramsite, the crushing and mixing methods of various hazardous wastes, clay and additives, the effective use and treatment of clay polluted by hazardous wastes, the drying and processing of ceramsite green bodies in rotary kilns A method for reducing harmful dust generated by motion wear in the preheating section. Background technique [0002] According to the national hazardous waste catalog, hazardous waste includes waste containing a certain amount of cadmium, lead, mercury, beryllium, cobalt, nickel, chromium, zinc, barium, copper, antimony, thallium, arsenic, selenium, fluorine, cyanide, and asbestos. Hazardous wastes are generally toxic, flammable, explosive, corrosive, chemically reactive, or infectious nature, it must be treated to make it harmless, and it is best to further achieve effective use. [0003] Cadmium, lead, mercury, beryllium, cobalt, n...

AI Technical Summary

Problems solved by technology

[0004] Hazardous wastes are mostly produced in the chemical industry, metallurgical industry, etc. People in the industry are familiar with chemical methods. For many years, chemical reaction, reduction, complexation, incineration, landfill, sealed and isolated storage and other methods have been used to control and treat hazardous wastes. Due to the variety of hazardous wastes , the stability after treatment is also different, and some harmful phenomena reappear in a short period of time or after a few years or years; the amount of hazardous waste is relatively large, and the cost of treatment is high. Some enterprises have incomplete treatment and treatment due to economic or technical reasons , the landfill is not standardized, has left a major disaster hidden danger, has and will gradually pollute a large amount of soil and groundwater, and because of the wide distribution and large quantity, it will seriously affect the future living conditions of various regions and even the entire nation and country, and its harm is far away. It is more serious than smog, basically irreparable and difficult to eliminate within hundreds of years

[0005] The production of ceramsite from fly ash, coal gangue and other wastes has been relatively common. Recently, urban wastewater sludge, printing and dyeing wastewater sludge, waste incineration fly ash, red mud from aluminum factories, and solid waste from ceramic factories have also been used to produce ceramsite. Research on the production of ceramsite from individual hazardous wastes, but traditional ceramsite production equipment is generally used. Traditional ceramsite production equipment, methods, and processes do not take into account the characteristics of hazardous waste. The crushing and mixing method is also enough to make the toxic dust content in the workshop far exceed the standard. The traditional method of manufacturing granules makes the strength of the green body relatively low, and the movement and wear in the drying and preheating sections of the rotary kiln generate toxic dust. The production of ceramsite is mostly used Double-barrel rotary kiln, even if the negative pressure inside the barrel is maintained, there is still about 10% of dust escape in actual production, which is unacceptable regardless of national standards or human health requirements