Method used for making bricks from domestic waste incineration fly ash and furnace slag

A technology of domestic waste incineration and fly ash, applied in cement production and other directions, can solve the problems of restricting the market and development of fly ash resource-based bricks, restricting the use range of fly ash resource-based bricks, poor mechanical properties and environmental friendliness, etc. Thermal and mechanical properties, good effects, good social and economic benefits
CN108314366AActive Publication Date: 2018-07-24TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2018-07-24

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Abstract

The invention discloses a method used for making bricks from domestic waste incineration fly ash and furnace slag. The method comprises following steps: 1, CaO in domestic waste incineration fly ash is subjected to slaking; 2, a sulfur containing compound and cement are added into a material obtained via slaking, and an obtained mixture is subjected to stirring homogenizing and heavy metal stabilization; 3, a product obtained via heavy metal stabilization is subjected to curing so as to obtain a fly ash heavy metal solidified body; 4, the fly ash heavy metal solidified body is subjected to crushing so as to obtain a fly ash powder material; 5, CaO in furnace slag is subjected to slaking; 6, a product material obtained via slaking of CaO in furnace slag is subjected to drying so as to obtain furnace clinker; 7, the furnace clinker is subjected to crushing so as to obtain furnace slag powder; 8, the fly ash powder material, the furnace slag powder, fly ash, NaOH, and water are mixed so as to obtain a mortar; and 9, the mortar is subjected to curing and moulding so as to obtain bricks. According to the method, geopolymeric gel and tobermorite are adopted to prepare building materials,resource utilization on fly ash and furnace slag is realized, brick mechanical properties are improved, and multistage solidification stabilization of heavy metal in fly ash is realized.
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Description

technical field

[0001] The invention relates to a method for making bricks by using domestic waste incineration fly ash and slag, and belongs to the technical field of resource utilization of hazardous waste and general industrial waste building materials. Background technique

[0002] Domestic waste incineration fly ash (hereinafter referred to as fly ash) refers to the residues collected in flue gas purification systems and heat recovery systems (such as economizers, waste heat boilers, etc.).

[0003] Due to the volatilization and migration of heavy metals during incineration, a large amount of heavy metals, such as Hg, Pb, Cd, Cu, Cr, Zn, Ni, etc., are enriched in fly ash. According to existing literature reports, in fly ash in my country, Zn can reach up to 17000mg / kg, Cu can reach up to 12000mg / kg, Pb can reach up to 30000mg / kg, Cd can reach up to 5000mg / kg, and Cr can reach up to 3500mg / kg. kg, Ni up to 1500mg / kg. Once heavy metals enter the human body, it will be di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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