Method for producing silicate cement by using silico-calcium dregs and carbide dregs

Abstract

The invention provides a method for producing silicate cement by using silico-calcium dregs and carbide dregs, relating to the technical field of building materials. The method has the following steps: 1. adding carbide dregs and water into silico-calcium dregs followed by dealkalization and carrying out pressure filtering and drying on the dealkalized silico-calcium dregs if the alkali content in the silico-calcium dregs is high, or directly drying the silico-calcium dregs if the alkali content in the silico-calcium dregs is low; and drying the carbide dregs and desulfurated plaster respectively; 2. dosing and homogenizing the dealkalized silico-calcium dregs and carbide dregs after drying; 3. sending the homogenized crude materials into a rotary kiln for high temperature calcinations and obtaining the cement clinker after cooling; and 4. smashing the cement clinker and sending the smashed cement clinker and the dried desulfurated plaster into a cement grinding mill for grinding to prepare the silicate cement. Compared with the prior art, the method of the invention is simple in process, low in investment, low in production cost, low in energy consumption, and stable in the prepared silicate cement performance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for producing Portland cement by using calcium silicate slag and carbide slag. Background technique [0002] Fly ash is a waste discharged from power plants. Because it is rich in alumina and silica, there are currently many studies on extracting alumina from fly ash. The methods for extracting alumina from fly ash include limestone sintering method and soda lime sintering method. In both sintering methods, limestone is added to the fly ash for sintering, and the silicon dioxide in the fly ash reacts with calcium carbonate to produce a large amount of waste residue containing dicalcium silicate, which is called silicon-calcium slag for short. According to the limestone sintering method, the amount of slag produced by using fly ash to produce 1 ton of alumina is as high as about 9 tons, and the amount of slag generated by the soda lime sintering method is abou...

AI Technical Summary

Problems solved by technology

Since the chemical composition of calcium silicate slag is close to that of cement clinker, but there is a certain difference, direct firing without adding other minerals, there is insufficient CaO content in cement clinker, less tricalcium silicate content, and the performance of cement clinker is not up to the standard. to the best question

Moreover, limestone has to go through crushing and grinding processes, which increases cost and energy consumption.

Soda ash is added to the calcium silicate slag produced during the production of alumina by the soda lime sintering method, which results in a high alkali content in the calcium silicate slag, which cannot be directly used in cement production. caused environmental pollution

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