Process for producing highly active steel slag powder and inert mineral products from steel slag

A technology of steel slag powder and high activity, which is applied in the direction of cement production, process efficiency improvement, chemical instruments and methods, etc. It can solve the problems of complicated process, difficult to use, and inability to clearly reflect the grinding resistance of minerals, so as to achieve the connection of process Scientific and reasonable effect

CN106755650BActive Publication Date: 2017-12-26西安鼎岩钢渣应用科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-12-26

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Abstract

The invention discloses a technology of producing high-activity steel slag powder and an inert mineral product by using steel slag. The technology comprises the six steps of dry process grinding, pneumatic separation, dry process magnetic separation, wet process grinding, wet process magnetic separation and dehydration. In the step of the dry process grinding, tailings after slag iron are recovered are ground into steel slag powder, and inert mineral dissociation is realized; in the step of the pneumatic separation, the steel slag powder is subjected to size grading by using a superfine powder concentrator, so that the enrichment of inert minerals in coarse powder is realized, and fine powder is a high-activity steel slag powder product; in the step of the dry process magnetic separation, the coarse powder is purified to be coarse concentrate by employing the magnetism of the inert minerals, and coarse tailings return back to the dry process grinding step; the coarse concentrate is made into fine pulp through the wet process grinding; the fine pulp is separated into a humid inert mineral raw material and a humid cement iron raw material through the wet process magnetic separation; and after the humid inert mineral raw material and the humid cement iron raw material are dehydrated separately, the inert mineral product and a cement iron raw material are obtained, and water returns to the wet process grinding step. According to the technology, the steel slag is processed into the high-activity steel slag powder, the high-iron-grade inert mineral product and the cement iron raw material, so that the full resource utilization of the steel slag is realized.
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Description

technical field

[0001] The invention belongs to the technical field of steel slag processing, and relates to the full resource utilization of steel slag, in particular to a process for producing high-activity steel slag powder and inert mineral products from steel slag. Background technique

[0002] Steel slag is solid waste discharged from steelmaking, and its yield is generally 15% of crude steel output. According to the domestic monthly crude steel output of Oupu Steel Network, the total output of crude steel in my country in 2015 was 800.53 million tons, and about 120 million tons of steel slag was produced every year. The comprehensive utilization rate of steel slag announced by the Ministry of Industry and Information Technology in recent years has not exceeded 21%, and 95 million tons of waste steel slag has been added annually, which affects the smooth discharge of slag in steelmaking production, and also occupies valuable land and causes environmental pollution. The...

Examples

Embodiment 1

[0042] Steel slag produced by a steel company in Shanxi is ground into steel slag powder by roller press, with a specific surface area of ​​310m 2 / kg. Using GB / T 20491-2006 "Steel slag powder used in cement and concrete" inspection, the activity index of steel slag powder: 74% for 3d, 78% for 7d, and 82% for 28d. Determination of three kinds of inert content in steel slag powder: Fe content 1.25%, Fe content 3 o 4 content of 5.25%, the content of RO phase is 34.87%, and the total content of inert minerals is 41.37%. The steel slag powder is sorted by an industrial small ultra-fine powder separator with a cutting particle size of 18 μm to obtain a high-activity steel slag powder product. The activity index of high activity steel slag powder: 3d is 80%, 7d is 88%, 28d is 91%. After pneumatic separation, the activity index of steel slag powder is increased by about 10%, the total content of inert minerals is 8.96%, and the product quality fully meets the market requirements....

Embodiment 2

[0045] The steel slag produced by an iron and steel company in Yunnan is ground into steel slag powder by ball milling industrial facilities, and its specific surface area is 400m 2 / kg. Using GB / T 20491-2006 "Steel slag powder used in cement and concrete" inspection, the activity index of steel slag powder: 7d is 68%, 28d is 75%. Determination of three kinds of inert content in steel slag powder: Fe content 2.04%, Fe content 3 o 4 content of 6.05%, the content of RO phase is 35.43%, and the total content of inert minerals is 43.52%.

[0046] The steel slag powder is sorted by an industrial small-scale ultra-fine powder separator with a cutting particle size of 18.1 μm to obtain a high-activity steel slag powder product. The activity index of high activity steel slag powder: 79% for 7d and 87% for 28d. The activity index of steel slag powder is increased by about 12% after pneumatic separation, the total content of inert minerals is 9.52%, and the product quality of steel ...