Ultra-fine high-activity steel slag powder and preparation method thereof

A technology of steel slag powder and activity, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve continuous operation, reduce wear, and achieve remarkable effects of originality and innovation

Active Publication Date: 2020-10-09
SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, there is a technical bottleneck for steel slag powder to enter the concrete or cement market like slag powder

Method used

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  • Ultra-fine high-activity steel slag powder and preparation method thereof
  • Ultra-fine high-activity steel slag powder and preparation method thereof
  • Ultra-fine high-activity steel slag powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment (1

[0036] 1) A steel plant in Anhui meets the national standard "Steel slag powder used in cement and concrete", that is, GB / T20491 secondary steel slag powder as raw material, the main technical indicators are as follows:

[0037] Average particle size 12.4μm; metallic iron 1.94%, specific surface area 422m 2 / kg, density 3.41g / cm 3

[0038] 2) First put 160 kg of raw material steel slag into the dry magnetic separator in batches, adjust the magnetic field strength to 2500 (GS), adjust the feeding rate to 20 kg / hour, and start the automatic feeding button. After 8 hours, the specific surface area is 422m 2145 kilograms of active steel slag powder per kg, the metal iron content is reduced to 0.42% and 15 kilograms of low activity, weak magnetic residue.

[0039] 3) Put 100 kg of active steel slag powder into the hopper of the OS-I superfine classifier, adjust the linear speed of the rotor to 100 m per second, start the automatic feeding button, and carry out dry winnowing and ...

Embodiment 2

[0046] 1) A steel plant in Shandong meets the national standard "Steel slag powder used in cement and concrete", that is, GB / T20491 secondary steel slag powder as raw material, the main technical indicators are as follows:

[0047] The average particle size is 13μm; the metal iron content is 2.34%, the specific surface area is 402㎡ / ㎏, and the density is 3.60g / cm 3

[0048] 2) First put 160 kg of raw material steel slag into the dry magnetic separator in batches, adjust the magnetic field strength to 2500 (GS), adjust the feeding rate to 20 kg / hour, and start the automatic feeding button. After 8 hours, 144 kg of active steel slag powder with a specific surface area of ​​402㎡ / ㎏ was obtained, and the content of metallic iron was reduced to 0.42% and 16 kg of low activity and weak magnetic residue

[0049] 3) Put 100 kg of active steel slag powder into the hopper of the OS-I superfine classifier, adjust the linear speed of the rotor to 100m per second, start the automatic feedin...

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Abstract

The invention provides superfine high-activity steel slag powder and a preparation method thereof. According to the preparation method provided by the invention, a three-circulation process techniqueof circulated magnetic deironing, circulated superfine dry-type air separation degrading and circulated superfine grinding is adopted to prepare the superfine high-activity steel slag powder. The content of iron of the superfine high-activity steel slag powder provided by the invention is less than or equal to 0.5%, the average particle size of the powder is controlled to be less than or equal to6.0mu m, the specific surface area of the powder is greater than or equal to 850m<2> / kg, and the product has the characteristics of being high in early-stage pressure resistance. The three-day pressure resistance activity index (%) of the powder is greater than or equal to 85%, which is 1.55 times of a provided value of a seven-day pressure resistance activity index of secondary steel slag powderof the national standard Steel Slag Powder Used for Cement and Concrete, that is, GB / T20491, and the 28-day pressure resistance activity index (%) of the powder is greater than or equal to 95%, whichis 1.46 times of a provided value of secondary steel slag powder GB / T20491.

Description

technical field [0001] The invention belongs to the technical field of steel slag utilization, in particular to a superfine high-activity steel slag powder and a preparation method thereof. [0002] technical background [0003] my country's steel production accounts for 80% of the world's total, and the annual discharge of steel slag tailings exceeds 50 million tons, occupying thousands of hectares of land, posing a threat to the ecological environment of the surrounding areas of the steel plant, and has seriously restricted the sustainable development of my country's steel industry. Continuous development. [0004] In 2006, the national standard "Steel Slag Powder Used in Cement and Concrete" was released, namely GB / T20491, and a guiding fund was set up to propose the establishment of a group of steel slag micro-powder enterprises to achieve the goal of "zero" steel slag discharge and annual consumption of 50 million tons of steel slag , to promote the industrial developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/19C04B7/38C04B20/02C04B18/14
CPCC04B5/00C04B7/19C04B7/38C04B20/026C04B20/02C04B18/142Y02P40/10Y02W30/91
Inventor 陆文雄施庆安郁士忠樊钧曹栋樑
Owner SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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