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

A technology of Portland cement and calcium silicate slag, which is applied in the field of building materials, can solve the problems that the performance of cement clinker is not optimal, cannot be directly produced with cement, and the alkali content of calcium silicate slag is high, so as to achieve resource utilization , Improve the utilization rate of heat and realize the effect of waste heat utilization

Inactive Publication Date: 2009-12-02
TONGFANG ENVIRONMENT
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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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  • Method for producing silicate cement by using silico-calcium dregs and carbide dregs

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Referring to accompanying drawing, production step of the present invention is:

[0028] 1) Using the soda lime sintering method to extract alumina from fly ash, the silica-calcium slag filter cake with 35% water attached, Na 2 O3.81% (calculated on a dry basis), 41% of water attached to calcium carbide slag in a chemical plant, CaO60.85% (calculated on a dry basis), and the proportioning of silicon-calcium slag: calcium carbide slag = 100:8 by weight on a dry basis, plus appropriate amount Water undergoes a dealkalization reaction. Keep the reaction temperature at 90°C, keep stirring, press filter and wash after reacting for 1 hour, and dry the filter cake of dealkalized calcium calcium slag with a dryer. Na 2 The O content was reduced to 0.44%. Carbide slag is dried with a dryer.

[0029] 2) The dried dealkalized calcium ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B7/02
CPCY02P40/10
Inventor 曹慧芳孙俊民张晓云张战军王彦武姚强
Owner TONGFANG ENVIRONMENT
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