Method and device for treating steel slag

A processing method and technology for steel slag, applied in the field of metallurgy, can solve the problems of low hydration activity, good crystallization, unqualified stability of cement products, etc., and achieve the effect of improving the recycling rate

Active Publication Date: 2015-07-22
BERIS ENG & RES CORP
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The slag-forming material reacted with silica is transformed into alkaline earth metal (calcium, magnesium) silicate and fluorosilicate. The high-temperature process transforms into free calcium oxide and free magnesium oxide. These f-CaO and f-MgO that exist in large quantities have a high formation temperature, good crystallization, and low hydration activity, so the hydration rate is very slow
[0005] When f-CaO meets water, it hydrates to form Ca(OH) 2 , the volume expansion is 98%, and f-MgO hydrates to form Mg(OH) after meeting water 2 , the volume expansion is 148%, which is easy to cause the expansion of cement in the later stage of hardening
Therefore, if the advantages of Portland cement clinker components in steel slag are used to apply steel slag as a hydraulic cementitious material in the field of building materials, the large amount of f-CaO and f-MgO will lead to unqualified stability of cement products, making Steel slag cannot be directly used as a hydraulic cementitious material in the field of building materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for treating steel slag
  • Method and device for treating steel slag
  • Method and device for treating steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] A steel plant with an annual output of 2.3 million tons of steel is equipped with two 120-ton converters, and the annual output of converter slag is about 280,000-300,000 tons after adopting the "three-stripping" process of molten iron. The main components (wt.%) of the converter slag after the "three stripping" of molten iron are shown in Table 1.

[0095] Table 1 Composition of converter slag (wt.%)

[0096]

[0097] The fly ash from a coal-fired power plant was selected as the supplementary material of silicon-aluminum oxide. The chemical composition (wt.%) of the fly ash is shown in Table 2.

[0098] Table 2 Power plant fly ash composition (wt.%)

[0099]

[0100] The steel slag produced from the converter is transported to the slag treatment site with a slag tank. The transportation time should be controlled within 30 minutes to ensure the temperature of the steel slag. The steel slag is poured into the receiving chute through the tilting mechanism. Due to ...

Embodiment 2

[0115] A steel plant with an annual output of 3 million tons of steel is equipped with three 1080 cubic meter blast furnaces and three 100-ton converters. After adopting the "three removal" process of molten iron, the annual output of blast furnace slag is about 1.4-1.6 million tons, and the annual output of converter slag About 360,000-400,000 tons. The main components (wt.%) of the converter slag after the "three stripping" of molten iron are shown in Table 3.

[0116] Table 3 Composition of converter slag (wt.%)

[0117]

[0118] Blast furnace slag is selected as the supplementary material of silicon-aluminum oxide, and the composition (wt.%) of blast furnace slag is listed in Table 4.

[0119] Table 4 Composition of blast furnace slag (wt.%)

[0120]

[0121] The steel slag produced from the converter is transported to the slag treatment site with a slag tank. The transportation time should be controlled within 30 minutes to ensure the temperature of the steel slag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
flexural strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for treating steel slag. The method comprises the steps of feeding silicon-aluminum acidic oxide and steel slag, wherein the total mole ratio of the silicon-aluminum acidic oxide to basic oxide in the mixture is 1:(2.5-2.9); heating and mixing the mixture in a rotary kiln in the presence of a reducing agent, wherein the temperature of the rotary kiln is 1350-1450 DEG C; granulating the product into particles, performing water quenching and cooling, then falling the particles into water, and performing dehydration; and performing magnetic separation on the dehydrated particles to ensure that steel particles are separated from series silicate particles. The invention also provides a device for treating the steel slag, and the device comprises a rotary kiln (5), a coal spraying device (6) which is arranged at the upper end of the tail of the rotary kiln (5), and a granulation wheel (8) which is arranged below a discharge chute (7) in the lower end of the tail of the rotary kiln (5). The series silicates obtained after the treatment of the steel slag by adopting the method disclosed by the invention can replace a silicate cement clinker to produce cement. The method disclosed by the invention realizes comprehensive utilization of industrial wastes.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steel slag treatment method. Background technique [0002] Currently, oxygen top-blown converter steelmaking is the mainstream steelmaking process. The oxygen top-blown converter steelmaking process is as follows: After loading scrap steel and adding molten iron, shake the furnace body. While lowering the oxygen lance, add an appropriate amount of slagging material (such as quicklime, calcined Baiyunshan, fluorite, etc.) from the auxiliary material chute above the furnace mouth, and the slagging material floats on the surface of the molten pool. When the oxygen lance is lowered to the specified lance position, a high-pressure oxygen flow (purity greater than 99%) is blown in, and the oxygen reacts with the carbon in the high-temperature molten iron to generate carbon monoxide to reduce the carbon content, and at the same time, it also oxidizes with the silicon, manganese, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04C04B7/153
CPCY02W30/542Y02P40/10Y02W30/50
Inventor 赵铭贺春平康兴东王定洪王振平
Owner BERIS ENG & RES CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap