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Admixture of active powder of ball milling steel slag tailing slurry and application thereof in preparing concrete

A technology of steel slag tailings and admixtures, which is applied in the fields of environmental protection and building materials, and can solve problems such as insufficient resources of concrete admixtures

Inactive Publication Date: 2009-09-30
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to further develop resource utilization approaches for ball milling steel slag tailings and overcome the problem of insufficient concrete admixture resources in the prior art, the present invention provides a ball milling steel slag tailings active powder admixture and its application in concrete production to realize The comprehensive performance of concrete is improved while the high value-added utilization of ball milled steel slag tailings

Method used

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  • Admixture of active powder of ball milling steel slag tailing slurry and application thereof in preparing concrete
  • Admixture of active powder of ball milling steel slag tailing slurry and application thereof in preparing concrete

Examples

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preparation example Construction

[0009] The preparation method of the ball mill steel slag tailings active powder admixture of the present invention, the steps are as follows:

[0010] (1) Break the large ball mill steel slag tailings cake with high water content to 50-100cm, and let the water content of the ball mill steel slag tailings reach 9-10%.

[0011] (2) Use a jaw crusher to crush the ball milled steel slag tailings obtained in step (1) to 9 to 10 cm, and perform drying and heat treatment at a temperature of 100° C. to 120° C. to reduce the moisture content of the ball milled steel slag tailings to below 4%. , cooled to 28 ~ 30 ℃.

[0012] The above-mentioned drying heat treatment at a temperature of 100° C. to 120° C. uses the steam produced by a metallurgical waste heat boiler as a heat source.

[0013] (3) Crushing the natural gypsum to 5-10 mm, taking natural gypsum according to 5-8%wt of the ball mill steel slag tailings weight, and sending it into a ball mill for grinding with the crushed ball...

specific Embodiment approach

[0026] 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. The converter steelmaking steel slag is treated by open-air water quenching. Accounting for more than 95%, the sludge produced by wet washing ball mill grinding, washing and iron selection. The chemical composition of the steel slag tailings from ball milling is shown in Table 1.

[0027] Table 1 Analysis results of main chemical components of ball mill steel slag tailings

[0028]

[0029] The raw material of the concrete in the embodiment is as follows:

[0030] P.O 42.5 cement is selected as the cement adhesive; the selected 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%. The apparent density ...

Embodiment 1

[0031] Example 1: Ball milled steel slag tailings active powder as concrete admixture and its application in the preparation of concrete

[0032] The active powder of ball-milled steel slag tailings is used as concrete admixture, and the parts by weight are as follows: 100 parts of steel slag tailings and 5 parts of natural gypsum. The preparation method is as follows:

[0033] (1) After simply crushing the large piece of wet ball mill steel slag tailings cake with high water content to 50-100cm, use sunlight and natural wind to dry naturally, so that the water content of the ball mill steel slag tailings reaches 10%;

[0034] (2) The above-mentioned ball-milled steel slag tailings after natural cooling, adopt jaw crusher to crush the large pieces of tailings to below 10cm, and use the steam produced by waste heat boilers in iron and steel enterprises as a heat source to treat the steel slag tails with a water content of 10% The sludge is dried and heat-treated at a temperatu...

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Abstract

The invention relates to an admixture of active powder of ball milling steel slag tailing slurry and the application thereof in preparing concrete. Firstly, the ball milling steel slag tailing slurry with high water content is naturally air-dried and air-cured until the water content of the same is less than 10 percent; secondly, the ball milling steel slag tailing slurry is dried, dehydrated and heated at certain temperature so as to cause the water content of the same to be less than 4 percent, natural gypsum and the dried broken ball milling steel slag tailing slurry are proportionally mixed in a ball mill to be milled into certain fineness so as to be used as concrete admixture; and due to the adoption of proper concrete mixing proportion, the admixture of active powder of ball milling steel slag tailing slurry can be used for partially replacing cement gel according to the weight percentage of 20 to 40 percent, and the concrete with C20-C40 strength degree can be prepared. The invention efficiently utilizes solid wastes of steel enterprises, changes the solid wastes into valuable and has simple production process, obviously reduced concrete production cost and favorable economic and environmental benefit.

Description

technical field [0001] The invention relates to a ball-milled steel slag tail mud active powder admixture and an application method for preparing concrete, belonging to the technical fields of building materials and environmental protection. Background technique [0002] Steel slag is a by-product produced in the steelmaking process of iron and steel enterprises, most of which are converter steel slags. At present, most of the converter steel slags of major domestic steel companies still adopt extensive wet treatment methods, that is, red hot steel slag is pumped with water. After quenching and cracking into block slag, the slag field is crushed, magnetically separated and screened. When the iron content (TFe content is about 20%) of the tailing slag after magnetic separation is high, except for a small part, it is used to produce steel slag powder. In addition to being used in the field of building materials, most of the tailings are used for road construction and landfill,...

Claims

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Application Information

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IPC IPC(8): C04B7/153C04B28/08
CPCY02P40/10
Inventor 刘智伟李志峰孙庆亮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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