Municipal solid waste incineration fly ash solidification method based on rice hull ash-red mud composite cementing material

Abstract

Belonging to the field of low-carbon cementing materials and solid waste environmental protection, the invention discloses a municipal solid waste incineration fly ash solidification method based on arice hull ash-red mud composite cementing material. The method includes: firstly mixing rice hull ash, sodium hydroxide and a proper amount of mixing water uniformly, placing the mixture in a high-temperature bath pot, carrying out intensified excitation reaction, performing cooling to room temperature, pouring the product into a stirring pot, adding red mud until the slurry is stirred uniformly,then adding municipal solid waste incineration fly ash, and further performing stirring for 2-5min to obtain a uniform slurry, i.e. a solidified body of municipal solid waste incineration fly ash. The solidification technology for municipal solid waste incineration fly ash provided by the invention utilizes the high-alkali characteristic of red mud, the excellent physical-chemical adsorption performance, cation exchange capacity and other performance characteristics of the rice hull ash and red mud to greatly reduce the harm of municipal solid waste incineration fly ash to the ecological environment and human health, at the same time, the production process adopted by the invention is simple, performs waste control by waste, is low in cost, efficient and environment-friendly, and has remarkable economic and environmental protection significance and wide market prospects.

Description

technical field [0001] The invention relates to the fields of new low-carbon gelling materials and solid waste environmental protection, and provides a solidification method for municipal solid waste incineration fly ash, in particular to a municipal solid waste incineration fly ash based on rice husk ash-red mud composite gelling material curing method. Background technique [0002] With the rapid development of my country's economy and the improvement of living standards, domestic waste incineration technology has become the mainstream method of waste treatment. The fly ash produced in the waste incineration flue gas treatment system is enriched with a large amount of heavy metals and a small amount of dioxins and other pollutants, which have been listed It is HW18 hazardous waste. It is estimated that the output of fly ash from municipal solid waste incineration nationwide will reach 7 million tons in 2020. [0003] The output of rice and red mud in my country has ranked ...

AI Technical Summary

Problems solved by technology

Most of these rice husk ash and red mud have not been utilized as resources, occupying a large amount of landfill space, and the light powder and high alkalinity of rice husk ash have brought serious environmental hazards to atmospheric soil water resources.

Red mud is a strongly alkaline substance (pH value > 12), and the main pollutants are alkali, fluoride, sodium and aluminum, etc., and its content is relatively high, far exceeding the discharge standards stipulated by the state ("Nonferrous Metal Industry Solid Waste Pollution Control Standards "GB5058-85), the red mud sewage with high alkalinity seeps into the ground or enters the surface water, which increases the pH value of the water body, seriously exceeding the corresponding standards stipulated by the state, and at the same time affects the toxicity of the compounds in the water, causing more serious problems water pollution

[0004] The resource utilization rate of rice husk ash, red mud and municipal solid waste incineration fly ash is low, and the stockpiles are increasing day by day. The traditional landfill disposal method of solid waste and hazardous waste not only occupies a large amount of land, but also has high processing costs and Serious safety hazards to the ecological environment and human health have become an urgent environmental problem in our country