Carbonized steel slag building material product prepared from cement kiln tail flue gas and method thereof

A cement kiln and carbonized steel technology, applied in the field of comprehensive utilization of resources, can solve the problems of difficult utilization of steel slag, shorten the maintenance cycle of steel slag building material products, etc., and achieve the effects of reducing production cost and energy consumption, low cost and simple process flow

Pending Publication Date: 2022-07-29
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention utilizes cement kiln tail gas to carbonize steel slag products to convert steel slag into building material products, which effectively shortens the maintenance period of steel slag building material products, significantly reduces carbon emissions of cement enterprises and reduces CO in the flue gas. 2 Turning waste into treasure solves the problem that steel slag is difficult to use. At the same time, the entire process fully utilizes the temperature of the flue gas at the tail of the cement kiln without additional energy consumption, reducing the requirements for carbonization reaction equipment and the overall cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The present embodiment provides a carbonized steel slag building material product, and its preparation method is as follows:

[0036] Step 1: Dry the steel slag to a moisture content of less than 1%, and grind it to a specific surface area of ​​350m 2 / kg of steel slag powder;

[0037] Step 2: Put 30 parts of steel slag powder, 70 parts of ordinary Portland cement, 50 parts of water, and 300 parts of natural river sand into a mixer for 60 s at a slow speed, and then quickly mix for 180 s to fully mix;

[0038] Step 3: Add the mixed mixture into the mold twice, the size of the mold is 40*40*160mm, and the mixture needs to be vibrated each time;

[0039] Step 4: demoulding after 1d of standard curing, put the hardened building materials into the waste gas kiln at the tail of the cement kiln and test the compressive strength after curing for 2d and 6d. (Carbonization curing conditions: carbon dioxide concentration 20%, temperature 30°C, humidity 75%).

[0040] The steel...

Embodiment 2

[0042] The present embodiment provides a carbonized steel slag building material product, and its preparation method is as follows:

[0043] Step 1: Dry the steel slag to a moisture content of less than 1%, and grind it to a specific surface area of ​​350m 2 / kg of steel slag powder;

[0044] Step 2: Put 30 parts of steel slag powder, 70 parts of ordinary Portland cement, 50 parts of water, and 300 parts of natural river sand into a mixer for 60 s at a slow speed, and then quickly mix for 180 s to fully mix;

[0045] Step 3: Add the mixed mixture into the mold twice, the size of the mold is 40*40*160mm, and the mixture needs to be vibrated each time;

[0046] Step 4: demoulding after 1d of standard curing, put the hardened building materials into the waste gas kiln at the tail of the cement kiln and test the compressive strength after curing for 2d and 6d. (Carbonization curing conditions: carbon dioxide concentration 30%, temperature 80°C, humidity 75%).

[0047] The 3d co...

Embodiment 3

[0049] The present embodiment provides a carbonized steel slag building material product, and its preparation method is as follows:

[0050] Step 1: Dry the steel slag to a moisture content of less than 1%, and grind it to a specific surface area of ​​350m 2 / kg of steel slag powder;

[0051] Step 2: Put 30 parts of steel slag powder, 70 parts of ordinary Portland cement, 30 parts of water, 300 parts of natural river sand, and 0.5 part of polycarboxylate water-reducing agent into the mixer after slow stirring for 60s, and then rapidly stirring for 180s to carry out well mixed;

[0052] Step 3: Add the mixed mixture into the mold twice, the size of the mold is 40*40*160mm, and the mixture needs to be vibrated each time;

[0053] Step 4: demoulding after 1d of standard curing, put the hardened building materials into the waste gas kiln at the tail of the cement kiln and test the compressive strength after curing for 2d and 6d. (Carbonization curing conditions: carbon dioxide ...

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Abstract

The invention relates to the field of comprehensive utilization of resources, in particular to a carbonized steel slag building material product prepared from cement kiln tail flue gas and a preparation method of the carbonized steel slag building material product. The method comprises the following steps: mixing steel slag powder, cement, water, sand and an additive in proportion, hardening under a standard curing condition, and then carbonizing in a cement kiln tail gas kiln to obtain the carbonized steel slag building material product. According to the method disclosed by the invention, the steel slag product is carbonized by utilizing the cement kiln tail flue gas, and the steel slag is converted into the building material product, so that the maintenance period of the steel slag building material product is effectively shortened, the carbon emission of cement enterprises is remarkably reduced, CO2 in the flue gas is turned into wealth, and the problem that the steel slag is difficult to utilize is solved; meanwhile, the temperature of the tail flue gas of the cement kiln is fully utilized in the whole technological process, additional energy consumption is not needed, and the requirement for carbonization reaction equipment and the overall cost are reduced. The steel slag building material product prepared by the method is good in stability and excellent in comprehensive performance, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to a carbonized steel slag building material product prepared by utilizing cement kiln tail flue gas and a method thereof. Background technique [0002] Global warming caused by carbon dioxide emissions has become an environmental problem that cannot be ignored. While advocating energy conservation and emission reduction, how to deal with a large amount of CO 2 Emissions have become a major problem that needs to be overcome today. Therefore, carbon dioxide sequestration and utilization technologies are particularly important. So far, mineral storage is considered to be the safest method of carbon dioxide sequestration, which provides high storage capacity and may store all future emissions. [0003] Due to its easy availability and low cost, industrial solid waste has become the first choice for mineral sequestration. The chemical composition and mineral compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/142C04B14/06C04B2103/302C04B2103/10
Inventor 王亚丽孙烈王肇嘉王卉崔素萍郑永超李宁
Owner BEIJING UNIV OF TECH
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