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Method for preparing cement-based material from carbonized steel slag slurry

A cement-based material and carbonized steel technology, applied in cement production and other directions, can solve the problems of increasing capital investment and energy consumption, high filtration and drying costs and disadvantages, reducing filtration and drying costs, and achieving significant environmental protection value. and application prospects, the effect of promoting cement hydration

Pending Publication Date: 2022-05-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the filtered solution is not utilized, and the discharge treatment will increase capital investment and energy consumption, which will bring pressure to the environment, and the cost of filtration and drying treatment is high, which is not conducive to the promotion of industrialization

Method used

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  • Method for preparing cement-based material from carbonized steel slag slurry
  • Method for preparing cement-based material from carbonized steel slag slurry
  • Method for preparing cement-based material from carbonized steel slag slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The steel slag selected in this embodiment is the converter steel slag after grinding, and the median particle size is 8.235 μm. Its chemical composition is shown in Table 1:

[0030] Table 1 Chemical composition of steel slag (wt.%)

[0031] CaO Fe 2 O 3

SiO 2

MgO MnO Al 2 O 3

P 2 O 5

other 42.09 21.72 16.50 6.71 4.83 3.48 2.18 2.49

[0032] This embodiment includes the following steps:

[0033] (1) Use a sieve with an aperture of 75 μm to remove insufficiently ground particles.

[0034] (2) Mix 225 g of steel slag and 600 g of water in a mixer at a solid-to-liquid ratio of 0.375 to obtain a slurry.

[0035] (3) Step (4) is carried out after raising the temperature of the slurry in the mixer to 38°C.

[0036] (4) The carbon dioxide with a concentration of 99.99% is uniformly introduced into the slurry, the flow rate is 2L / min, the stirring speed of the agitator is 1000rpm / min, the time for the carbonized ...

Embodiment 2

[0055] The steel slag selected in this embodiment is the converter steel slag after grinding, and the median particle size is 14.588 μm. Its chemical composition is shown in Table 4:

[0056] Table 4 Chemical composition of steel slag (wt.%)

[0057] CaO Fe 2 O 3

[0058] The difference between this example and Example 1 is that the carbonization time is extended to 80 minutes to obtain a carbonized steel slag slurry with a carbon dioxide absorption rate of 10.87wt.% and a solution pH of 7.391, and the calculated water replenishment mass is 9.78g.

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Abstract

The invention relates to a method for preparing a cement-based material by using carbonized steel slag slurry, which comprises the following steps: introducing carbon dioxide while stirring steel slag and an aqueous solution, and controlling the stirring speed and temperature to obtain the carbonized steel slag slurry. And calculating the water replenishing mass according to the CO2 absorption rate, and mixing and stirring all carbonized slurry, replenishing water, cement and other materials to prepare the cement-based material. The steel slag used by the cement-based material is converter steel slag with the particle size of 0-75 microns, and the highest cement replacement rate can reach 30%. Compared with an uncarbonized steel slag composite cement-based material, the prepared carbonized steel slag composite cement-based material has the advantages that the 28-day strength can be improved by 15%, the problem of poor volume stability of the steel slag is solved, the utilization rate of the steel slag is improved, 10-16 wt.% of carbon dioxide can be absorbed, and the carbonized steel slag composite cement-based material has obvious economic benefits and environmental protection values.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing cement-based materials by using carbonized steel slag slurry. Background technique [0002] Human activities have produced a large amount of carbon dioxide, leading to the global greenhouse effect. "Carbon peaking" and "carbon neutrality" are imperative. Alkaline solid waste can fix carbon dioxide into stable calcium and magnesium carbonate, which is a potential raw material for accelerating carbonization and fixation of carbon dioxide. As the main alkaline solid waste, steel slag is the main by-product of the crude steel smelting process, and its emission accounts for about 8% to 15% of the crude steel output. Using steel slag as a raw material for fixing carbon dioxide can not only absorb a large amount of carbon dioxide, alleviate the greenhouse effect, but also solve the stability problem of steel slag, making it possible to apply it in large quantiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B7/147C04B7/38
CPCC04B28/082C04B7/147C04B7/38C04B7/00C04B22/10C04B22/002Y02P40/10
Inventor 林忠财李轶莎罗双
Owner HUNAN UNIV
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