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A method for improving the stability of steel slag aggregates

A stable, steel slag technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor stability of steel slag, achieve waste reuse, reduce production costs, high strength and hardness Effect

Active Publication Date: 2020-12-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide a method for improving the stability of steel slag aggregates. In this method, the crushed, screened and classified steel slag particles are placed in an environment with a certain partial pressure of carbon dioxide and relative humidity. Carbonization treatment improves the stability of steel slag and solves the problem of poor stability of steel slag

Method used

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  • A method for improving the stability of steel slag aggregates
  • A method for improving the stability of steel slag aggregates
  • A method for improving the stability of steel slag aggregates

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Embodiment 1

[0029] A method for improving the stability of steel slag aggregates, the specific steps are as follows:

[0030] (1) Classify the steel slag particles after crushing and iron selection, and divide them into group I below 2.36mm, group II at 2.36-4.75mm, group III at 4.75-9.5mm, group IV at 9.5-19mm, and group V at 19-37.5mm These five gears. Two samples of 5 kg were taken from each grade of steel slag, one group was used as the experimental group, and the other group was used as the blank control group. The two groups of samples were placed in the carbonization box or carbonization kettle and spread evenly, and the carbonization time was selected as 21d.

[0031] (2) The carbonization intensity of the carbonization box or carbonization kettle in the experimental group was set to 3MPa·h, 7MPa·h, 12MPa·h, 22MPa·h, 54MPa·h respectively, and the corresponding CO 2 The partial pressure strengths are 0.0059MPa, 0.00139MPa, 0.0238MPa, 0.0437MPa and 0.1071MPa respectively. The rel...

Embodiment 2

[0043] The steps of embodiment 2 are basically the same as those of embodiment 1, except that the carbonization intensity of the steel slag of the experimental group I to V is respectively set to 6MPa h, 12.5MPa h, 25MPa h, 50MPa h, 125MPa h h, CO in the corresponding carbonization box or carbonization kettle 2 The partial pressure strengths are 0.0119MPa, 0.0248MPa, 0.0496MPa, 0.0992MPa and 0.2480MPa respectively. The results of the sieving index and stability improvement rate of each sample determined in this way are shown in Table 3.

[0044] Table 3 Example 2 each sample residue index and stability improvement rate result table

[0045]

[0046]

[0047] It can be seen from Table 3 that the stability improvement rates of the grade five steel slags after screening and classification are 615.07%, 529.94%, 423.15%, 342.56% and 316.45% in ascending order of labels.

Embodiment 3

[0049] The steps of embodiment 3 are basically the same as those of embodiment 1, except that the carbonization intensity of the steel slag of the experimental group I to V is respectively set to 9MPa h, 18.5MPa h, 36MPa h, 78MPa h, 196MPa h h, CO in the corresponding carbonization box or carbonization kettle 2 The partial pressure strengths are 0.0179MPa, 0.0357MPa, 0.0714MPa, 0.1548MPa and 0.3889MPa, respectively. The results of the sieve index and stability improvement rate of each sample thus determined are shown in Table 4.

[0050] Table 4 embodiment 3 each sample residue index and stability improvement rate result table

[0051] Particle size (mm) I 1

[0052] It can be seen from Table 4 that the stability improvement rates of the grade five steel slag after screening and grading are 682.93%, 589.29%, 477.20%, 362.75% and 346.84% in ascending order of labels.

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Abstract

The invention relates to a stability improvement method of steel slag aggregates. According to the method, different carbonization strengths are applied to screened and graded steel slag by use of carbon dioxide gas in a carbonization box or a carbonization kettle at the specific temperature and specific humidity, the stability of the steel slag is improved as far as possible, the treated steel slag can be prepared into cement mortar, cement concrete, pervious concrete or asphalt concrete aggregate for use, the steel slag has better stability, and the utilization rate of the steel slag can besubstantially increased.

Description

technical field [0001] The invention relates to the technical field of building materials and solid waste, in particular to a method for improving the stability of steel slag aggregates. Background technique [0002] my country's steel output ranks first in the world, accounting for about 50% of the world. In 2016, the production of steel slag was about 120 million tons, but its comprehensive utilization rate is currently less than 15%. Using it as aggregate is a practical way for large-scale comprehensive utilization of steel slag. [0003] Steel slag aggregate has high strength and wear resistance, and it is closely combined with cement paste, asphalt mortar, etc. It is a high-quality potential aggregate, especially for road concrete with deep color, wear resistance, and anti-skid and other natural aggregates are difficult to match. However, the stability of steel slag is not good, and a small amount of f-CaO contained in it is the root cause. Tang Mingshu et al. .Acta ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/14
CPCC04B18/142C04B20/023Y02W30/91
Inventor 沈卫国杜雪剑张笛许阁龙张昺榴吉晓莉汤兴蕾
Owner WUHAN UNIV OF TECH
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