Ultrafine slag powder, and preparation method and application thereof

A technology for ultra-fine slag powder and slag, which is applied in the field of comprehensive utilization of solid waste resources, can solve the problems of severe wear of grinding equipment, affect the activity of slag powder, and increase the preparation cost, so as to simplify the production process, save energy consumption, avoid The effect of increased equipment wear

Inactive Publication Date: 2015-04-01
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing fine grinding process of slag powder, the grinding method of vertical mill is relatively common, but the particle size of slag is relatively coarse, which affects the activity of slag powder
In order to obtain the slag fine powder with high surface area, there is often the phenomenon of over-grinding in the grinding process, resulting in high energy consumption and severe wear and tear of grinding equipment, thus increasing the preparation cost

Method used

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  • Ultrafine slag powder, and preparation method and application thereof
  • Ultrafine slag powder, and preparation method and application thereof
  • Ultrafine slag powder, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1), the granulated blast furnace slag with a moisture content of 5% is transported to the raw material storehouse by a belt conveyor;

[0035] (2), the slag in the raw material warehouse is transported to the vertical mill for pre-grinding through metering and conveying equipment, and hot air is introduced while grinding;

[0036] (3), the pre-grinding pre-abrasives are transported to 1 through pneumatic conveying equipment under the action of negative pressure # The powder classifier is used for classification, and the specific surface area is 450m 2 / kg of mineral powder, through 1 # The dust bag is collected and entered into the transfer warehouse;

[0037] (4), the specific surface area is less than 450m 2 / kg slag coarse powder falls to the bottom of the grinding table of the vertical mill and enters the external circulation, and the slag coarse powder is lifted to the top of the vertical mill by the bucket elevator and then enters the vertical mill for grindin...

Embodiment 2

[0046] (1), the granulated blast furnace slag with a moisture content of 12% is transported to the raw material warehouse by a belt conveyor;

[0047] (2), the slag in the raw material warehouse is transported to the vertical mill for pre-grinding through metering and conveying equipment, and hot air is introduced while grinding;

[0048] (3), the pre-grinding pre-abrasives are transported to 1 through pneumatic conveying equipment under the action of negative pressure # The powder separator is used for classification, and the selected specific surface area is 430m 2 / kg of mineral powder, through 1 # The dust bag is collected and entered into the transfer warehouse;

[0049] (4), the specific surface area is less than 430m 2 / kg slag coarse powder falls to the bottom of the grinding table of the vertical mill and enters the external circulation, and the slag coarse powder is lifted to the top of the vertical mill by the bucket elevator and then enters the vertical mill for...

Embodiment 3

[0057] (1), the granulated blast furnace slag with a moisture content of 9% is transported to the raw material warehouse by a belt conveyor;

[0058] (2), the slag in the raw material warehouse is transported to the vertical mill for pre-grinding through metering and conveying equipment, and hot air is introduced while grinding;

[0059] (3), the pre-grinding pre-abrasives are transported to 1 through pneumatic conveying equipment under the action of negative pressure # The powder classifier is used for classification, and the specific surface area is 400m 2 / kg of mineral powder, through 1 # The dust bag is collected and entered into the transfer warehouse;

[0060] (4), the specific surface area is less than 400m 2 / kg slag coarse powder falls to the bottom of the grinding table of the vertical mill and enters the external circulation, and the slag coarse powder is lifted to the top of the vertical mill by the bucket elevator and then enters the vertical mill for grinding...

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Abstract

The invention belongs to the field of comprehensive utilization of solid waste resource, and especially relates to an ultrafine slag powder, and a preparation method and application thereof. Vertical-milling grinding and two stages of sorting technologies are combined, a slag pre-grinded material subjected to vertical milling is subjected to a first stage of grading processing, so that a mineral powder with the specific surface area according with a requirement is sorted out, and unqualified slag crude powder falls into a vertical mill for grinding. The slag powder according with the requirement is subjected to a second stage of grading processing, so that a slag powder with the particle size of 20 mu m or less is sorted out, overly grinding phenomenon is avoided, and energy consumption and cost are reduced. The prepared slag powder has relatively high activity, can be applied to concrete as a mineral doping material, is capable of reducing the cost of concrete and concrete products, increasing the strength of concrete and improving the endurance of concrete, and also is applicable to production of pipe sheets and pipe piles. After the concrete is doped with the ultrafine slag powder, the doping amount of a cementing material can be properly reduced, and thus the purpose of saving energy and reducing cost and improving effect are realized.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources, and in particular relates to an ultrafine slag powder and its preparation method and application. Background technique [0002] Granulated blast furnace slag is a molten material with aluminosilicate as the main component when smelting pig iron in the blast furnace. After quenching and granulating, it is a material with potential hydraulicity. It is called slag for short. Its main chemical composition is SiO 2 、Al 2 o 3 And CaO, etc., different mineral powder series products can be obtained by processing slag through different production processes. According to different activity, particle size and particle size distribution, the products are also used in different construction fields. After research, it is found that ultra-fine mineral powder with high activity can be produced through a certain processing technology. This ultra-fine mineral powder can be used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14
CPCY02W30/91
Inventor 王振兴王迪陆雁单卫良康明张红王强
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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