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Preparation method of high-activity cement admixture

A cement admixture, high activity technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high iron content, complicated process, poor stability, etc., to increase mineral content, The effect of simplifying the process method and solving the utilization problem

Active Publication Date: 2022-02-08
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem solved by the present invention is that there are many ways to utilize the slag material of the cement admixture in the prior art. Although the slag of the converter is included, the replacement cement content rarely exceeds 30%; Magnetite, the process is complicated, if it is not removed, it will lead to high iron content and reduce the utilization rate of converter steel slag in the preparation of cement admixture; and the prepared cement admixture has low early strength and poor stability , the utilization rate of solid waste is not high, and the production cost is high, which is not conducive to large-scale industrial production

Method used

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  • Preparation method of high-activity cement admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 320g of converter steel slag, the proportion is 80%; 40g of carbide slag, the proportion is 10%; 40g of blast furnace slag, the proportion is 10%. Mix the three evenly and put them into a crucible, then put the crucible into a box-type muffle furnace and raise the temperature to 1350°C. The specific heating process is: 10°C / min for 20-200°C, and 15°C / min for 200-1350°C. After 30 minutes of heat preservation, the sample was taken out together with the crucible for rapid cooling by fan. The cooled sample was crushed, pulverized by a vibratory mill, and subjected to XRD and chemical composition tests respectively. The test results are shown in Table 2 and Figure 4 shown.

[0044] As shown in Table 2, the calcium and aluminum content of the highly active cement admixture prepared by using carbide slag and blast furnace slag as the molten converter steel slag conditioner under high temperature conditions increased significantly. The iron content is reduced, and the ...

Embodiment 2

[0048] Take 280g of converter steel slag, the proportion is 70%; 60g of carbide slag, the proportion is 15%; 60g of blast furnace slag, the proportion is 15%. Mix the three evenly and put them into a crucible, then put the crucible into a box-type muffle furnace and raise the temperature to 1350°C. The specific heating process is: 10°C / min for 20-200°C, and 15°C / min for 200-1350°C. After 30 minutes of heat preservation, the sample was taken out together with the crucible for water quenching and rapid cooling. The cooled samples were crushed, pulverized by vibratory milling, and subjected to XRD and chemical composition tests respectively. The test results are shown in Table 3 and Figure 5 shown.

[0049] As shown in Table 3, the calcium and aluminum content of the highly active cement admixture prepared by using carbide slag and blast furnace slag as the molten converter steel slag conditioner under high temperature conditions increased significantly. The iron content is r...

Embodiment 3

[0053] Such as figure 2 As shown, take 300g of converter steel slag, the proportion of which is 75%; 50g of carbide slag, the proportion of which is 12.5%; 50g of blast furnace slag, the proportion of which is 12.5%. Mix the three evenly and put them into a crucible, then put the crucible into a box-type muffle furnace and raise the temperature to 1350°C. The specific heating process is: 10°C / min for 20-200°C, and 15°C / min for 200-1350°C. After 30 minutes of heat preservation, the sample was taken out together with the crucible for rapid cooling by fan. The cooled samples were crushed and pulverized by vibratory milling, and XRD and chemical composition tests were carried out respectively. The test results are shown in Table 4.

[0054] As shown in Table 4, the calcium and aluminum content of the highly active cement admixture prepared by using carbide slag and blast furnace slag as the molten converter steel slag conditioner under high temperature conditions increased sign...

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Abstract

The invention discloses a preparation method of a high-activity cement admixture, and belongs to the technical field of converter steel slag treatment application and industrial solid waste building material resource utilization. The method comprises the following steps: mixing converter steel slag as a main raw material and carbide slag and blast furnace slag as auxiliary materials, heating in a reaction furnace until the temperature of the molten converter steel slag is reached, carrying out heat preservation treatment, quenching to room temperature, and crushing and ball-milling into powder, thereby obtaining the high-activity cement admixture. According to the invention, the molten converter steel slag is taken as the main raw material, the industrial solid waste is taken as the hardening and tempering agent, and the high-activity cement admixture with the activity reaching S95 grade is prepared from all solid wastes, so that the aim of synergistically utilizing various industrial solid wastes is fulfilled, and the quality level of subsequent utilization of the converter steel slag is effectively improved; the utilization problem caused by activity and stability of the converter steel slag is solved, the iron content of the converter steel slag as a cement admixture is effectively reduced, and the substitution ratio of cement is increased to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of converter steel slag treatment application and industrial solid waste building material resource utilization, and relates to a preparation method of a high-activity cement admixture. Background technique [0002] Converter slag is a solid waste in the iron and steel metallurgical industry, accounting for about 11-15% of steel production, and is one of the main solid wastes in the iron and steel industry. Due to technical difficulties in the utilization and recycling of converter steel slag, most of the steel slag is temporarily piled up and abandoned as waste, which not only occupies a large amount of land resources, but also brings serious harm to the surrounding environment (destruction of soil, vegetation, pollution of air and water sources, etc.). [0003] At present, one of the main utilization methods of converter steel slag is to grind the converter steel slag tailings after magnetic separation to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B20/04C04B18/04
CPCC04B40/0042C04B20/04C04B18/0481C04B18/141C04B18/142Y02W30/91Y02P40/10
Inventor 张玲玲王庆国王肇嘉郑永超王卉李宁苍大强
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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