Preparation technology of superfine steel slag micropowder and production process

A technology of ultra-fine steel slag powder and production process, which is applied in the direction of process efficiency improvement, solid separation, magnetic separation, etc., and can solve the problems of difficulty in processing steel slag and low removal rate of metallic iron

Active Publication Date: 2012-06-27
SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been difficult to process steel slag with traditional grinding equipment for a long time. At present, in the application technology field of steel slag powder, the specific surface area of ​​steel slag powder is ≤500m 2 / kg, and steel slag powder with a particle size of ≤40μm only accounts for less than 65%, the iron content in steel slag powder is ≤1%, and the removal rate of metallic iron is not high

Method used

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  • Preparation technology of superfine steel slag micropowder and production process
  • Preparation technology of superfine steel slag micropowder and production process
  • Preparation technology of superfine steel slag micropowder and production process

Examples

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Effect test

Embodiment 1

[0014] The steel slag tailings particles (≤20mm) provided by a Shanghai Iron and Steel Co., Ltd. go through the drying and magnetic separation process, and enter the pre-grinding closed-circuit circulation system through electronic weighing. The column mill is used for grinding, and the feed (20-25 ) t, the fineness of the grinding material is controlled to be ≤35.0% (2.5mm sieve), and the material flows into the classification process consisting of a V-type powder separator and a fine powder collector (V-type powder separator cycle load = 120%), after classification The coarse material is returned to the column mill for circular grinding after magnetic separation and iron removal, and the fine material (2.5mm sieve residue = 1.3%, metallic iron = 0.95%) enters the final grinding closed circuit system; the high-fine grinding feeds 36 per hour tons, the fineness of the material to be milled is controlled (28-29)% (45μm sieve residue), the speed of the K-type powder separator is ...

Embodiment 2

[0016] The ≤25mm steel slag tailings particles provided by a steel factory in Nanjing are sent to the column mill by electronic weighing after drying and magnetic separation. 30.0% (remainder of 2.5mm sieve), the material flows into the classification process composed of V-type powder separator and fine powder collector (the cycle load of V-type powder separator is 125%), after classification, the coarse material returns to the column mill after magnetic separation and iron removal The machine performs circular grinding, and the fine material (2.5mm sieve residue = 1.5%, metallic iron content = 0.75%) enters the final grinding closed loop system; the high-fine grinding feeds 40 tons per hour, and the fineness of the grinding material is controlled ( 26~27)% (remainder of 45μ sieve), the speed of K-type powder separator N=270 / min, the specific surface area of ​​the selected ultra-fine steel slag powder is 635m 2 / kg, ultra-fine steel slag powder with a particle size of less tha...

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Abstract

The invention relates to a preparation technology of superfine steel slag micropowder and a production process thereof. Metal iron included in steel slag is separated and recycled for many times in circulation by selecting a column mill, a V-shaped powder separator and a magnetic separator as a pre-grinding closed cycle system; and trace metal iron included in superfine steel slag micropowder is separated and recycled for many times by selecting a high-fine mill, a K-type powder separator, a settling chamber and the magnetic separator to form a final-grinding closed cycle system. Accordingly,the prepared superfine steel slag micropowder has the specific surface area of larger than or equal to 600m<2> / kg, wherein the superfine steel slag micropowder with grain diameter smaller than 30 mu m accounts for more than 90 percent of the total mass and has the metal iron content of not more than 0.5 percent.

Description

technical field [0001] The invention relates to a preparation technology and a production process of superfine steel slag micropowder, belonging to the technical fields of comprehensive utilization of industrial solid waste and building materials. Background technique [0002] With the increase of my country's steel production year by year, the discharge of steel slag also increases. Micronizing steel slag is a key way to comprehensively utilize steel slag and improve the added value of steel slag technology. However, due to the inclusion of slag and iron in steel slag, the structure is dense, the hardness is high, and it is not easy to break and grind. It has been difficult to process steel slag with traditional grinding equipment for a long time. At present, in the application technology field of steel slag powder, the specific surface area of ​​steel slag powder is ≤500m 2 / kg, and steel slag powder with a particle size of ≤40 μm only accounts for less than 65%, the iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06B22F9/04
CPCB03C1/30C04B5/00C21B3/08C21B2400/022Y02P10/20
Inventor 陆文雄樊钧施钟毅郁士忠曹栋樑
Owner SHANGHAI HAILI NEW ENVIRONMENTAL PROTECTION BUILDING MATERIAL CO LTD
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