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Method for preparing high-performance concrete additive by using steel slag ball-milling waste residue

A technology for admixtures and waste residues, applied in the field of high-performance admixtures, can solve problems such as difficult grinding and iron removal, and achieve the effects of improving recovery rate, reducing energy consumption, and reducing magnetic separation processes.

Inactive Publication Date: 2012-03-21
北京首钢资源综合利用科技开发有限公司 +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high-performance concrete admixture by using steel slag ball mill waste slag, which solves the problems of steel slag iron removal and difficult grinding, and realizes low-cost ultra-fine grinding of steel slag. Physical excitation gives full play to the activity of steel slag, and its performance is superior to that of ordinary steel slag. It is a high-performance admixture

Method used

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Examples

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Embodiment

[0021] Examples are as follows: the present invention introduces the waste slag after ball mill water washing and magnetic separation into a spiral classifier, and sorts tailings powder containing 110 kg of metallic iron per 1000 kg. Then pump the suspension into the sedimentation tank. After sedimentation, use a plate and frame filter press to press the sedimentation tailings with a high water content under a pressure of 1.5 MPa into a mud cake with a water content of 350 kg per 1000 kg. The mud cake falls into the silo, and the mud cake is sent to the hammer crusher dryer by the belt conveyor. After drying and crushing, the tailings with a particle size of 0.8mm and a moisture content of 2.2% are obtained. The tailings directly enter the pre-grinding bin as raw materials before grinding. The mill is equipped with an electronic belt scale to ensure uniform feeding of tailings and calculate processing volume. After being ground by a ball mill, the specific surface area is 520...

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Abstract

The invention discloses a method for preparing high-performance concrete additive by using steel slag ball-milling waste residue, belonging to the technical field of concrete for building materials. The method comprises the steps: ovetails containing metallic iron is separated from the waste residue through a spiral classifier; washed turbid liquid is conveyed into a sedimentation tank; sedimented tailing slurry with higher water content is pressed to a mud cake with lower water content by a pressure filter; the water content of the tailing slurry is reduced to below 3 percent after drying and crushing; and then the tailing slurry enters a ball mill to be grinded to 500m<2> / kg, thus obtaining the high-performance concrete additive. The method has the advantages of simple process, low cost, superior performance, obvious effects on improving concrete strength and construction quality and reducing concrete and construction costs and environment pollution, and has significant economical and practical significance for promoting the smooth implementation of strategy of sustainable development of China.

Description

technical field [0001] The invention belongs to the technical field of concrete for building materials, and in particular relates to a method for preparing high-performance concrete admixtures by using steel slag ball mill waste slag, which is further sorted, crushed, dried and ground to produce high-performance concrete admixtures for concrete. Admixtures. Background technique [0002] In order to maximize the selection of metallic iron contained in steel slag, many areas in China often adopt ball mill wet separation process. Steel slag ball mill waste slag is the residual slag after ball mill water washing and then magnetic separation. Due to the high water content and low iron content of the waste residue, the utilization rate is low. Most enterprises no longer use the waste residue washed by the ball mill and discharge it directly, causing new pollution to the environment and bringing great pressure to environmental protection. . Therefore, the resource reuse of steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 孟立滨赵宏贵于宪章张福强李成宜纪秋博霍兰平
Owner 北京首钢资源综合利用科技开发有限公司
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