A synergistic process of carbonization and hydration of steel slag

A steel slag and process technology, applied in the field of steel slag carbonization and hydration synergistic process, can solve the problems of low degree of internal reaction, restricting the application field of products, reducing the mechanical properties of steel slag products, etc. Environmental pollution problems, the effect of improving mechanical and durability performance

Active Publication Date: 2021-08-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The production of low-grade steel slag bricks through carbonization of steel slag has achieved certain research results, but the reaction characteristics of carbonization from the outside to the inside make the surface layer of steel slag products densified prematurely, limiting the CO 2 The transmission to the inside of the product leads to a low degree of internal reaction, which in turn reduces the mechanical properties of the steel slag product and limits the application field of the product

Method used

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  • A synergistic process of carbonization and hydration of steel slag
  • A synergistic process of carbonization and hydration of steel slag

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Embodiment 1

[0020] A steel slag carbonation and hydration synergistic process, comprising the following steps:

[0021] (1) Light pottery sand pretreatment: sieve the light pottery sand, then soak the sifted pottery sand in water for 24 hours, drain the excess water after it is fully absorbed and saturated, and obtain a saturated surface dry pre-wet Light pottery sand; the particle size of the light pottery sand after sieving is below 0.6mm, and the apparent density is 1750kg / m 3 , the saturated water absorption of the pre-wet light pottery sand is 12%;

[0022] (2) Mixing: Mix the pre-wet light pottery sand with steel slag and quartz sand evenly in the following parts by weight: 66 parts of steel slag, 29 parts of quartz sand, 5 parts of pre-wet light pottery sand; the steel slag has a particle size distribution of In 0.5 ~ 80μm, the apparent density is greater than 3000kg / m 3 , the specific surface area is greater than 450m 2 / kg, steel slag powder with an iron content of less than 1...

Embodiment 2

[0031] A steel slag carbonation and hydration synergistic process, comprising the following steps:

[0032] (1) Light pottery sand pretreatment: sieve the light pottery sand, then soak the sifted pottery sand in water for 24 hours, drain the excess water after it is fully absorbed and saturated, and obtain a saturated surface dry pre-wet Light pottery sand; the particle size of the light pottery sand after sieving is below 0.6mm, and the apparent density is 1750kg / m 3 , the saturated water absorption of the pre-wet light pottery sand is 12%;

[0033] (2) Mixing: Mix the pre-wet light pottery sand with steel slag and quartz sand evenly according to the following parts by weight: 49.6 parts of steel slag, 30.4 parts of quartz sand, 20 parts of pre-wet light pottery sand; the steel slag has a particle size distribution of In 0.5 ~ 80μm, the apparent density is greater than 3000kg / m 3 , the specific surface area is greater than 450m 2 / kg, steel slag powder with an iron content...

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Abstract

The invention belongs to the technical field of building materials, and in particular relates to a steel slag carbonation and hydration synergistic process. The process includes: 1) pre-wet treatment of light pottery sand; 2) uniformly mixing pre-wet light pottery sand with steel slag and quartz sand according to the following mass ratio: 50-70 parts of steel slag, 18-30 parts of quartz sand, pre-wetted light pottery sand, 5 to 20 parts of wet light pottery sand; (3) pressed into shape, immediately placed in a carbonization box for carbonization, followed by standard curing. The invention utilizes the chemical characteristics of steel slag having both carbonization activity and hydration activity, and introduces the synergistic mechanism of carbonization curing and pre-wet ceramic sand internal maintenance to improve the overall reaction degree of steel slag and further improve the mechanical and durability properties of steel slag products; the prepared Steel slag products have the characteristics of high homogeneity of carbonized matrix, excellent mechanical properties and durability, low cost and high environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a steel slag carbonation and hydration synergistic process. Background technique [0002] my country is a country with a large steel output, and the resulting steel slag is as high as tens of millions of tons every year. The effective comprehensive utilization of steel slag has been relatively mature abroad. The application of steel slag in road construction in developed countries such as the European Union, Japan and the United States has reached 54%, 36% and 52% respectively, of which only about 10% of steel slag in Germany is not used due to quality problems and is stored in the yard. However, there is still a big gap between my country and developed countries in the research and application of steel slag reuse. [0003] At present, the application of steel slag is mainly concentrated in the fields of road base filler and cement admixture, and the stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
CPCC04B30/00C04B2201/50C04B18/023C04B18/142C04B14/06C04B40/0231
Inventor 胡曙光刘志超何永佳王发洲陈平冀更新
Owner WUHAN UNIV OF TECH
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