Preparation method for high-activity ultrafine granulated slag micro powder

A slag micropowder and ultra-fine particle technology, which is applied in the field of building materials, can solve the problems of low early strength of slag Portland cement, difficulty in exerting potential activity, poor slag grindability, etc. The effect of grinding efficiency

Inactive Publication Date: 2018-05-08
MAANSHAN BAOLONG NEW BUILDING MATERIALS
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AI Technical Summary

Problems solved by technology

In the production process of slag Portland cement, cement clinker and slag are mixed and ground together, and the grindability of slag is worse than that of cement clinker, and the particles are relatively coarse, so its potential activity is difficult to exert. Therefore, slag Portland cement Low early strength and prone to bleeding

Method used

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Embodiment Construction

[0020] A method for preparing high-activity ultra-fine slag micropowder. Firstly, desulfurization gypsum and CaO are used as activators to perform chemical / thermal compound excitation treatment on coal gangue, and then blast furnace slag is used as the main material to carry out the primary process using a vertical mill. Mix and grind, then add grinding aids, and perform secondary ball milling in a horizontal ball mill to obtain superfine granulated slag powder.

[0021] The specific surface area of ​​the gangue is 700-800m 2 / kg.

[0022] Specific steps are as follows:

[0023] (1) Active stimulation treatment:

[0024] Add 37 parts of coal gangue, 3 parts of CaO and 6 parts of desulfurized gypsum into the planetary ball mill, add appropriate amount of water and wet mill at room temperature for 15 minutes, dry the slurry mixture in an oven at 100°C for 7 hours, and then put the mixture After being kept in a muffle furnace at 700°C for 6 hours, it was cooled to room tempera...

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Abstract

The invention discloses a preparation method for high-activity ultrafine granulated slag micro powder. According to the invention, with desulfurized gypsum and CaO as activators, chemical/thermal composite excitation treatment is performed on coal gangue, so the material is given high volcanic ash activity; with blast-furnace slag as a main material, primary mixing and grinding are performed through a vertical mill; quartz sand powder and the prepared active material are added, so the trend of slag aggregation can be weakened or even eliminated, and the milling efficiency of the slag is improved; and secondary ball milling is performed through a horizontal ball mill, and under the action of surface activity of a milling auxiliary agent, the surface charges of the slag are affected, and theeffect of dispersing fine particles is achieved, so the specific surface area of the whole powder is improved. The high-activity slag micro powder obtained by using the preparation method provided bythe invention is applied to production of concrete and cement products, so the usage amount of cement can be reduced; the cost of production is reduced; and the durability of concrete is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of highly active ultrafine granulated slag powder. Background technique [0002] Slag powder is a powder material obtained by grinding granulated water-quenched blast furnace slag to a specified fineness. In the application of cement and concrete, it can be used not only as a mixture of cement, but also as an admixture of concrete. In the production process of slag portland cement, cement clinker and slag are mixed and ground together, and the grindability of slag is worse than that of cement clinker, and the particles are relatively coarse, so its potential activity is difficult to exert. Therefore, slag portland cement The early strength is low and prone to bleeding. Now it has begun to apply the technology of grinding cement clinker and slag to produce slag portland cement. [0003] Most coal gangue contains a large amount of clay minerals (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/153C04B7/36
CPCC04B7/153C04B7/24C04B7/36Y02P40/10
Inventor 晋元龙陈德全
Owner MAANSHAN BAOLONG NEW BUILDING MATERIALS
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