Preparation method of carbon excited slag brick

A technology of steel slag bricks and steel slag, which is applied in the field of preparation of carbon-activated steel slag bricks, can solve the problems of large volume expansion rate, consumption, poor stability, etc., and achieve good performance effects

Inactive Publication Date: 2018-06-12
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] my country's steel output ranks first in the world (accounting for about 50% of the world). In 2015, the production of steel slag was about 115 million tons (t), but the comprehensive utilization rate of steel slag is less than 15%. The utilization rate and the sustainable development of the steel industry are of great significance
[0005] At present, there are two bottlenecks (poor grindability and poor stability) and a short board (poor activity) in the application of steel slag to cement materials.
The first bottleneck is that the steel slag contains iron oxides, which leads to its poor grindability, and the second bottleneck is the hydration product Ca(OH) 2 , Mg(OH) 2 The large equ...

Method used

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  • Preparation method of carbon excited slag brick
  • Preparation method of carbon excited slag brick

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The steel slag used in this embodiment is WISCO steel slag, and its main components and content (wt%) are as shown in the following table:

[0033] Table 1 Chemical composition of steel slag

[0034]

[0035] After the steel slag is crushed, iron-selected and ground, the iron content is lower than 2%, and the particle size is about 0-5mm. Select the steel slag fine particles with a particle size of 4.75 mm to 1.18 mm for use. After infrared particle size analysis and detection, the content of the steel slag fine particles with a particle size of 4.75 mm to 1.18 mm is greater than 85%, and the particles exceeding 4.75 mm are not More than 5%. The above steel slag particles are dried and ground by a ball mill to obtain a particle size of 1 μm-100 μm and a Blaine specific surface area of ​​220-420m 2 / kg of steel slag powder. The Blaine specific surface area is measured according to the method in the national standard "Method for Determination of Cement Specific Surf...

Embodiment 2

[0041] Utilize steel slag from the same source as in Example 1 to prepare steel slag fine particles with a particle size of 2.36 mm to 0.6 mm, and a particle size of 1 to 100 μm and a Blaine specific surface area of ​​220 to 420 m 2 / kg of steel slag powder. The particle size distribution requirements of steel slag fine particles and steel slag fine powder remain unchanged.

[0042] Utilize above-mentioned steel slag to prepare the method for carbon excited steel slag brick as follows:

[0043] 1) Mixing: Take 138.1 parts of the above steel slag micropowder, 63.8 parts of fly ash, 37.5 parts of phosphogypsum (dihydrate gypsum), 10.6 parts of sodium sulfate, and 1200 parts of steel slag fine particles, and mix them in a mixer for 0.5-1min;

[0044] 2) Blank making: add 37.5 parts of water to the mixture obtained in step (1), stir for 1-2 minutes, then add 37.5 parts of water and stir for 2-3 minutes, and finally pour the mixture into a brick-making mold to form a steel slag br...

Embodiment 3

[0047] Steel slag from the same source as in Example 1 was used to prepare steel slag fine particles with a particle size of 4.75mm-1.18mm and 1.18mm-0.6mm, and a particle size of 1-100 μm and a Blaine specific surface area of ​​220-420m 2 / kg of steel slag powder. The particle size distribution requirements of steel slag fine particles and steel slag fine powder remain unchanged.

[0048] Utilize above-mentioned steel slag to prepare the method for carbon excited steel slag brick as follows:

[0049] 1) Mixing: Take 120.8 parts of the above-mentioned steel slag fine powder, 52.5 parts of silica fume, 75 parts of phosphogypsum (dihydrate gypsum), 1.7 parts of sodium sulfate, and 600 parts of fine steel slag particles with a particle size of 4.75 mm to 1.18 mm, with a particle size of 1.18 mm. 600 parts of steel slag fine particles of mm ~ 0.6mm, placed in a mixer and mixed for 0.5-1min;

[0050] 2) Blank making: add 40 parts of water to the mixture obtained in step (1), stir...

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Abstract

The invention relates to a preparation method of a carbon excited slag brick. The preparation method includes: mixing slag micropowder within a certain grain size range and obtained after smashing andiron separation, slag fine particle, phosphogypsum and water to form a brick blank, and preserving the brick blank in high-partial-pressure CO2 environment to obtain a high-strength slag brick product. Coal ash, silica fume, sodium sulfate and sodium carbonate can be added into raw materials of the carbon excited slag brick. The problem that a lot of slag and phosphogypsum cause emission pollution and are low in utilization rate is solved, the objective of waste reutilization is achieved, and the preparation method has good social benefit, economic benefit and environment benefit.

Description

technical field [0001] The invention relates to the technical field of building materials and solid waste, in particular to a method for preparing carbon-activated steel slag bricks. Background technique [0002] my country's steel output ranks first in the world (accounting for about 50% of the world). In 2015, the production of steel slag was about 115 million tons (t), but the comprehensive utilization rate of steel slag is less than 15%. The utilization rate and the sustainable development of the steel industry are of great significance. The steel slag of most steel mills in my country will go through the crushing and iron selection process after being discharged, and the steel slag can be prepared into graded steel slag of different particle sizes, but because the steel slag contains a considerable amount of f-CaO, its stability is poor, and it is directly Cracks or flakes easily when used in aggregates. Steel slag also shows poor activity when used as cement admixture ...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B40/02
CPCC04B28/143C04B2111/00017C04B2201/50C04B18/142C04B40/0231C04B18/08C04B22/147C04B18/146
Inventor 沈卫国王钰杰黄嘉祺吕振杰汤兴蕾刘燚吉晓莉
Owner WUHAN UNIV OF TECH
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