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Carbonized steel slag artificial porous aggregate and preparation method thereof

A technology of porous aggregate and carbonized steel, applied in the field of industrial waste slag utilization, can solve the problems of difficult large-scale industrial production and popularization and application, low strength of steel slag aggregate, and hidden dangers of poor stability, and achieve excellent water retention performance and lower quality , the effect of enhancing the strength of the later stage

Active Publication Date: 2019-09-27
苏州博纽强新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problems to be solved: Aiming at the problems existing in the prior art such as low strength of steel slag aggregate, hidden danger of poor stability, high cost, complex process, high technical process requirements, difficulty in large-scale industrial production and popularization and application, the present invention provides a A carbonized steel slag artificial porous aggregate and a preparation method thereof have the advantages of high aggregate strength, safety and stability, simple preparation process and equipment, easy operation, low production cost, high efficiency, low-carbon environmental protection, etc.

Method used

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  • Carbonized steel slag artificial porous aggregate and preparation method thereof
  • Carbonized steel slag artificial porous aggregate and preparation method thereof
  • Carbonized steel slag artificial porous aggregate and preparation method thereof

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Embodiment 1

[0030] A kind of preparation method of carbonized steel slag artificial porous aggregate, see figure 1 , the method includes the following steps: crushing the steel slag block, putting the obtained crushed steel slag block into a mill, and grinding it into a specific surface area of ​​200m 2 / g of steel slag powder, weigh 60 parts by mass of steel slag powder, 10 parts by mass of Portland cement and 30 parts by mass of fly ash to mix, add water to form a ball with a mass water-cement ratio of 0.19, and obtain a spherical steel slag aggregate; The spherical steel slag aggregate obtained above was pre-cured for 72 hours under the conditions of humidity 50% and temperature 30°C. After the curing is completed, put the spherical steel slag aggregate with carbonized pre-structure into the carbonization kettle, introduce carbon dioxide with a concentration of 99.9vt.%, and carbonize it under the pressure of 0.1MPa for 8h to obtain the artificial porous aggregate of carbonized steel ...

Embodiment 2

[0032] A method for preparing artificial porous aggregate of carbonized steel slag, said method comprising the following steps: crushing steel slag blocks, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m 2 / g of steel slag powder; weigh 40 parts by mass of steel slag powder, 20 parts by mass of Portland cement and 40 parts by mass of fly ash to mix, add water to form a ball with a mass water-cement ratio of 0.19, and obtain spherical steel slag aggregate; then 50%, the pre-curing of the spherical steel slag aggregate obtained above was carried out for 48 hours at a temperature of 20°C. After the curing is completed, put the spherical steel slag aggregate with carbonized pre-structure into the carbonization kettle, introduce carbon dioxide with a concentration of 100vt.%, and carbonize for 72h under the pressure of 0.1MPa to obtain the artificial porous aggregate of carbonized steel slag, which is denoted as S3, And use ...

Embodiment 3

[0034] A method for preparing artificial porous aggregate of carbonized steel slag, said method comprising the following steps: crushing steel slag blocks, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m 2 / g of steel slag powder; weigh 40 parts by mass of steel slag powder, 10 parts by mass of Portland cement and 50 parts by mass of fly ash to mix, add water to form a ball with a mass water-cement ratio of 0.19, and obtain spherical steel slag aggregate; then 60%, under the condition of temperature 20°C, the spherical steel slag aggregate obtained above is pre-cured for 24 hours. After the curing is completed, put the spherical steel slag aggregate with carbonized pre-structure into the carbonization kettle, introduce carbon dioxide with a concentration of 40vt.%, and carbonize it under the pressure of 1MPa for 4 hours to obtain the carbonized steel slag aggregate, which is recorded as S6, and use this The aggregate is...

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Abstract

The invention discloses a carbonized steel slag artificial porous aggregate and a preparation method thereof, and belongs to the technical field of industrial waste slag utilization. The preparation method comprises the following steps of preparation of steel slag powder, wherein steel slag blocks are crushed, and the obtained crushed steel slag is put into a grinding machine to be ground into the steel slag powder; preparation of a pelletized steel slag aggregate, wherein at least one of the steel slag powder, Portland cement, brick powder and pulverized fuel ash is weighed and mixed, and water is added for pelletizing to obtain the pelletized steel slag aggregate; pretreatment of the aggregate, wherein the pelletized steel slag aggregate is pre-maintained; carbonization of the steel slag aggregate, wherein the pre-maintained pelletized steel slag aggregate is put into a carbonization vessel for carbonization to obtain the carbonized steel slag artificial porous aggregate. The prepared carbonized steel slag artificial porous aggregate has the advantages of high strength, safety, stability, simple preparation processes and equipment, easy operation, low production cost, high efficiency, low carbon, environmental protection and the like. The inner maintenance can be provided for concrete while the demand of the concrete for the strength of the aggregate is met, the self-shrinkage of the concrete is reduced, and the frost resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial waste slag utilization, and in particular relates to an artificial porous aggregate of carbonized steel slag and a preparation method thereof. Background technique [0002] Steel slag is an industrial by-product produced in the steelmaking process. However, due to the low gelling activity of steel slag and the high content of free CaO and MgO, it will lead to poor stability as a cementitious material and easily lead to concrete expansion and cracking, which greatly limits the use of steel slag. Dosage in building materials applications. In my country, the annual discharge of steel slag has exceeded 100 million tons. However, because the overall utilization level of steel slag is not high, a large amount of steel slag is piled up, and harmful metal elements will enter the soil, polluting arable soil resources, and the accumulation of steel slag occupies arable land. As a new treatment method fo...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/02C04B18/00
CPCC04B28/04C04B40/0281C04B40/0236C04B18/00C04B2201/20C04B18/142C04B18/08
Inventor 莫立武杨硕
Owner 苏州博纽强新材料科技有限公司
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