Process for preparing building ceramsite by synergistically melting and sintering various inorganic hazardous wastes

Abstract

The invention discloses a process for preparing the building ceramsite by synergistically melting and sintering of multiple inorganic hazardous wastes. The process comprises the steps of synergistically mixing the powdery and muddy inorganic hazardous waste, the inorganic residues obtained after hazardous waste treatment, a high-salt content concentrated solution obtained after sewage treatment and as the process water and an inorganic auxiliary agent, and drying after granulation; taking the organic hazardous wastes, such as the waste lubricating oil, the mineral oil and the hazardous waste pyrolysis oil, etc., as fuels, melting and sintering, recycling a carrier gas during a pellet drying process; cooling the sintered product, and screening to obtain the ceramsite and the pottery sand. The ceramsite can be used as a roadbed material, a concrete aggregate, a light brick filling material and a raw material required by a cement for mixture and production. According to the process, the purposes of harmless treatment and final resource utilization of various inorganic hazardous wastes are achieved, the problems that the single inorganic hazardous waste treatment is high in investment,the technological process is long, the residues are difficult to treat and the like are solved, and the secondary pollution emission during the hazardous waste treatment process is greatly reduced.

Description

Technical field: [0001] The invention relates to the field of inorganic hazardous waste treatment and comprehensive utilization, in particular to a process for producing building ceramsite by synergistic melting and sintering of various inorganic hazardous wastes. Background technique: [0002] Inorganic hazardous waste raw materials are hazardous waste containing heavy metals such as copper, nickel, tin, zinc, cadmium, chromium, lead, mercury, arsenic, etc., mainly from petrochemical, surface treatment, electroplating, electronics and environmental protection industries. These materials have The ingredients are complex, the grades are different, and the water content is high. With the development of industry, heavy metal pollution is becoming more and more serious. The spread of heavy metal wastewater pollution through the food chain will have a profound impact on the environment. Heavy metal wastewater pollution has gradually become a global research topic. [0003] At pr...

AI Technical Summary

Problems solved by technology

[0004] The main defects of solidified landfill are: (1) Incremental processing technology is backward and is being phased out

(2) Occupy valuable land resources

(3) Temporarily shelved and not disposed of, although it has been landfilled, but its potential pollution still exists

(4) The entire landfill cycle needs to treat leachate and monitor the condition of the anti-seepage membrane, and the maintenance cost is high

(5) It is difficult to select a site for a hazardous waste landfill, the construction investment is large, and the limitations are strong

Images