Technological process for preprocessing refuse burning fly-ash to be cement raw materials

Abstract

The invention provides a technique which makes the solid waste incineration fly ash into cement raw materials, comprising the following steps: washing, stirring, adding heavy metal stabilizer, separating liquid from solid waste incineration fly ash, mixing the solid waste incineration fly ash into the cement raw meal and sending the raw meal into a cement rotary kiln to calcine the raw meal so as to prepare the cement clinker. The invention also provides a method for treating the wastewater generated in the washing process. The solid waste incineration fly ash treated through the method disclosed in the invention can partially substitute for cement raw materials to prepare cement, while all the indicators of the cement can meet the relevant standards so as to effectively realize solid waste incineration fly ash resource utilization.

Description

technical field [0001] The invention relates to waste resource utilization technology, in particular to a process method for pretreating waste incineration fly ash into cement raw material. Background technique [0002] The main chemical components of waste incineration fly ash are CaO, SiO 2 、Al 2 o 3 and Fe 2 o 3 Wait. The cement substrate is mainly prepared from raw materials such as limestone and clay, and its main chemical components are CaO, SiO 2 、A1 2 o 3 etc., are a class of materials with a wide range and a large amount, which can be used as an absorption matrix for absorbing and processing a large amount of waste incineration ash. If waste incineration fly ash can be absorbed and treated in cement production, its significance is obvious if it is calculated by absorbing and treating 0.01 ton (ie 1%) fly ash per ton of cement produced. [0003] Theoretical analysis shows that the main components of waste incineration fly ash are similar to cement clinker, s...

AI Technical Summary

Problems solved by technology

[0004] However, there are a large amount of chlorine salts, heavy metals and a considerable amount of organic pollutants in the fly ash of waste incineration, which makes the resource utilization of fly ash more difficult. The form of chemical compound volatilizes during the calcination process of the cement rotary kiln to form a "skin" of the rotary kiln, and the excessive chlorine content in the cement clinker will cause corrosion of the steel bars in the concrete, and the chloride salt will also hinder the hydration of the cement; the second is First, the high-temperature volatilization of heavy metals in waste incineration fly ash will lead to clogging of cement kilns; third, ecological cement prepared by replacing part of cement raw materials with waste incineration fly ash must meet the requirements of existing hazardous waste management regulations, that is, the stabilization of heavy metals must be answered. and dioxin control issues