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Method for using steel slags to prepare lightweight carbonized building material

A steel slag, lightweight technology, which is applied in the field of comprehensive utilization of resources, can solve the problems of difficult utilization of steel slag carbonized products and high preparation costs, and achieve the effects of saving transportation costs, reducing consumption and protecting the environment.

Inactive Publication Date: 2019-04-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing light-weight carbonized building materials by using steel slag, aiming at solving technical problems such as difficult utilization of steel slag carbonized products and high preparation cost

Method used

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  • Method for using steel slags to prepare lightweight carbonized building material
  • Method for using steel slags to prepare lightweight carbonized building material
  • Method for using steel slags to prepare lightweight carbonized building material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1. Dry the steel slag to a moisture content of 0-1%, and grind the dried steel slag to a specific surface area of ​​400kg / m 2 and 600kg / m 2 Two parts; and mix uniformly according to the mass ratio of 1:1 to prepare steel slag mixture; dry the gypsum to a moisture content of 0-1%, and grind the dried gypsum to a specific surface area of ​​650kg / m 2 ;Dry the ceramsite to a moisture content of 0-1%;

[0037] Step 2: Mix the raw materials prepared in step 1 with steel slag 56.4%, gypsum 3.6%, and ceramsite 40% by weight percentage on a dry basis to obtain a mixed dry material, and add 0.9% of the total mass of the mixed dry material to the mixed dry material. Agent and the water that accounted for 15% of the total mass of the mixed dry material were stirred for 180 seconds to obtain a mixed slurry;

[0038] Step 3: Carry out constant temperature and humidity curing for 1 day in a standard concrete curing box at 20°C and a relative humidity above 95%;

[0039] Step 4...

Embodiment 2

[0043]Step 1. Dry the steel slag to a moisture content of 0-1%, and grind the dried steel slag to a specific surface area of ​​400kg / m 2 and 600kg / m 2 Two parts; and mix uniformly according to the mass ratio of 1:1 to prepare steel slag mixture; dry the gypsum to a moisture content of 0-1%, and grind the dried gypsum to a specific surface area of ​​650kg / m 2 ;Dry the expanded perlite to a moisture content of 0-1%;

[0044] Step 2, the raw materials prepared in step 1 are prepared according to 56.4% of steel slag, 3.6% of gypsum, and 40% of expanded perlite to obtain a mixed dry material according to the dry weight percentage, and add 0.9% of the total mass of the mixed dry material to the mixed dry material. The water agent and the water accounting for 15% of the total mass of the mixed dry material were stirred for 180 seconds to obtain a mixed slurry;

[0045] Step 3: Carry out constant temperature and humidity curing for 1 day in a standard concrete curing box at 20°C and...

Embodiment 3

[0050] Step 1. Dry the steel slag to a moisture content of 0-1%, and grind the dried steel slag to a specific surface area of ​​400kg / m 2 and 600kg / m 2 Two parts; and mix uniformly according to the mass ratio of 1:1.5 to prepare steel slag mixture; dry the gypsum to a moisture content of 0-1%, and grind the dried gypsum to a specific surface area of ​​650kg / m 2 ;Dry the ceramsite to a moisture content of 0-1%;

[0051] Step 2: Mix the raw materials prepared in step 1 with 84.6% steel slag, 5.4% gypsum and 10% ceramsite according to the weight percentage on a dry basis to obtain a mixed dry material, and add water accounting for 20% of the total mass of the mixed dry material to the mixed dry material and stir 180 seconds, obtain mixed slurry;

[0052] Step 3: Carry out constant temperature and humidity curing for 1 day in a standard concrete curing box at 20°C and a relative humidity above 95%;

[0053] Step 4: Remove the mold after molding and put it into a carbonization b...

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Abstract

The invention provides a method for using steel slags to prepare a lightweight carbonized building material, and belongs to the technical field of comprehensive utilization of resources. The method comprises the steps that firstly, 45-100% of the steel slags, 0-30% of desulphurization gypsum and 0-50% of lightweight aggregates are mixed and prepared into a solid mixture, then, a water reducing agent accounting for 0-0.9% of the total mass of the mixture and water accounting for 15-40% of the dry basis mass of the solid mixture are added to the solid mixture and stirred evenly, and the stirredmixture is poured into a die for casting; the mixture is subjected to constant-temperature constant-humidity curing in a concrete standard curing box, after shaping and die removal, curing is conducted in a carbonization chamber, and thus the steel slag carbonated building material is obtained. By the adoption of the method, the difficulty of low comprehensive utilization rate of the steel slags is overcome, the density of the building material is greatly lowered due to admixture of the lightweight aggregates, and the building material absorbs carbon dioxide in industrial waste gas, can also mitigate the greenhouse effect to a certain degree, and has certain economic benefits, environmental benefits and social benefits. The prepared building material has excellent early strength and stability.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for preparing lightweight carbonized building materials from steel slag. Background technique [0002] With the rapid development of China's steel industry, the discharge of steel slag is increasing year by year. my country's steel slag has accumulated more than 1 billion tons, and the annual output has reached about 100 million tons. However, the comprehensive utilization rate of steel slag is only about 30%, and the vast majority of steel slag has not been comprehensively utilized. A large amount of steel slag stockpiled not only occupies land, wastes resources, pollutes the environment, but also poses serious safety hazards. At present, the reuse of steel slag in my country mainly includes the extraction of valuable elements from steel slag, the production of steel slag as building materials, and the use of steel slag as filling materia...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B111/40
CPCC04B28/14C04B28/144C04B2111/40C04B2201/50C04B18/142C04B18/023C04B2103/302C04B14/185
Inventor 邢奕王雪李佳洁张思奇倪文
Owner UNIV OF SCI & TECH BEIJING
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