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Ball mill steel slag tailings and blast furnace slag composite active powder and its application in the preparation of concrete

A technology for blast furnace slag powder and steel slag tailings, which is applied in cement production and other directions, can solve problems such as insufficient resources of concrete admixtures

Inactive Publication Date: 2011-12-07
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to further develop resource utilization approaches for ball mill steel slag tailings and overcome the problem of insufficient concrete admixture resources in the prior art, the present invention provides a composite active powder admixture of ball mill steel slag tailings and blast furnace slag and the production of composite active powder concrete method

Method used

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  • Ball mill steel slag tailings and blast furnace slag composite active powder and its application in the preparation of concrete
  • Ball mill steel slag tailings and blast furnace slag composite active powder and its application in the preparation of concrete

Examples

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preparation example Construction

[0015] The preparation method of the ball mill steel slag tailings and blast furnace slag composite active powder admixture of the present invention has the following steps:

[0016] 1. Due to the high water content and strong viscosity of the slag cake sludge from the water washing ball mill system, it is not conducive to the direct processing and utilization of the subsequent process. The tailing sludge must be dried through drying pretreatment before subsequent crushing and grinding deal with. In order to save energy, if the production conditions permit, the large pieces of wet ball mill steel slag tailings cake with high water content can be simply crushed to 50-100 cm before drying treatment, and then dried naturally by sunlight and natural wind. The water content is lowered to below 10%, and the water content of the ball mill steel slag tailings can be reduced to 9-10% in consideration of saving time. If the production arrangement is relatively compact, it can be consid...

specific Embodiment approach

[0028] The present invention will be further described below in conjunction with the examples, but not limited thereto. The ball mill steel slag tailings used in the examples are produced by the Resource Utilization Branch of Laiwu Iron and Steel Taidong Industrial Co., Ltd., which is the converter steelmaking steel slag treated by the open-air water quenching method, and the tailings (particle size ≤ 5mm Particles account for more than 95%), and the sludge produced after wet-washing ball mill grinding, water washing, and iron selection. Blast furnace slag is blast furnace slag treated by granulation and water quenching, produced by Laiwu Iron and Steel Co., Ltd. The chemical composition of ball mill steel slag tailings and blast furnace slag is shown in Table 1.

[0029] P.O42.5 cement is selected as the cement adhesive; the particle size is 5-31.5mm, the mud content is 0.6%, the mud content is 0.3%, the needle-like particle content is 8%, and the crushing index value is 17%...

Embodiment 1

[0032] Embodiment 1: ball mill steel slag tailings and blast furnace slag composite active powder admixture, are all 500m2 by Blaine specific surface area 2 / kg~550m 2 / kg ball mill steel slag tailings powder and blast furnace slag powder are mixed in a weight ratio of 1:1.

[0033] The preparation steps are as follows:

[0034] (1) After simply crushing the large wet ball mill steel slag tailings cake with high water content to 50-100 cm, use sunlight or natural wind to dry naturally, so that the water content of the tailings reaches 10%;

[0035] (2) For the ball-milled steel slag tailings after natural cooling, use a jaw crusher to crush the large pieces of tailings to less than 10cm; use the steam produced by the waste heat boiler in the iron and steel enterprise as a heat source to treat the steel slag tails with a water content of 10% Sludge and granulated blast furnace slag with a moisture content of 10% are dried and heat-treated at a temperature of 100°C to 120°C to...

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Abstract

The invention relates to compound active powder of ball milling steel slag tailing slurry and blast-furnace slag and the application of the compound active powder in preparing concrete. The admixture is prepared by mixing ball milling steel slag tailing slurry powder and blast-furnace slag powder with equal Brinell specific surface area of 500-600 m <2> / kg according to the weight ratio of 1:1-2. When the compound active powder is used as concrete admixture, proper concrete mixing portion is adopted; and the admixture can be used for partially replacing equivalent cement gel according to the proportion of 30-50 percent so as to prepare the concrete with C30-C50 strength degree. The invention utilizes solid wastes of steel enterprises, changes the solid wastes into valuable and has simple production process, ensures that the concrete has good performance and markedly lowered manufacturing cost.

Description

technical field [0001] The invention relates to a composite active powder of ball mill steel slag tailings and blast furnace slag and its application in concrete preparation, which belongs to the technical field of environmental protection building materials. Background technique [0002] Composite active powder admixture is one of the main ways for the development of concrete materials. In order to improve the cement stone pore structure, hydrate structure and interface structure, the use of mineral ultrafine active powder admixture is one of the indispensable technical means for preparing high-performance concrete. one. [0003] Granulated blast furnace slag is industrial waste slag discharged during the ironmaking process. The slag after water quenching and quenching has high energy in its glass structure and high potential activity. The water-quenched blast furnace slag is ground to a certain fineness and filled in the voids of cement concrete, which greatly increases t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/147C04B28/08
CPCY02P40/10
Inventor 刘智伟孙庆亮李志峰王玮刘汝海刘永恒毛开金种振宇孙业新董晓春管山吉江丹张桂华
Owner LAIWU IRON & STEEL GRP
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