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Collaborative process for carbonizing and hydrating steel slag

A technology of steel slag and process, which is applied in the field of steel slag carbonation and hydration synergistic process, can solve the problems of restricting the application field of products, reducing the mechanical properties of steel slag products, and low internal reaction, so as to alleviate the waste of land resources and ecological environment pollution. Simultaneous growth with benefits, the effect of improving mechanical and durability performance

Active Publication Date: 2019-03-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Collaborative process for carbonizing and hydrating steel slag
  • Collaborative process for carbonizing and hydrating 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 particularly relates to a collaborative process for carbonizing and hydrating steel slag. The process comprises the following steps: (1) pre-wetting lightweight ceramic sand; (2) uniformly mixing the pre-wetted lightweight ceramic sand, the steel slag and quartz sand in parts by weight: 50 to 70 parts of the steel slags, 18 to30 parts of the quartz sand and 5 to 20 parts of the pre-wetted lightweight ceramic sand; and (3) pressing and forming, namely, immediately placing the mixture into a carbonizing box for carbonizing,and then performing standard curing. According to the collaborative process for carbonizing and hydrating the steel slag, a carbonizing curing and pre-wetted ceramic sand internal curing collaborative mechanism is introduced by utilizing the chemical characteristics of carbonizing activity and hydrating activity of the steel slag; the overall reaction degree of the steel slag is improved; the mechanical properties and the durability of a steel slag product are further improved; the prepared steel slag product has the characteristics that the homogeneousness of a carbonized matrix is high, themechanical properties and the durability are excellent, the cost is low, and the environment friendliness is high.

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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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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