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Method for recycling slag from non-blast furnace ironmaking by COREX smelting reduction process

A recycling and non-blast furnace technology, which is applied in the direction of recycling technology and process efficiency improvement, can solve the problems of environmental pollution and resource waste, and achieve the goal of avoiding resource waste and environmental pollution, and the recycling and processing method is simple, feasible and practical Effect

Active Publication Date: 2009-12-30
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recycling non-blast furnace ironmaking slag by the COREX smelting reduction method in view of the existing defects and market demand, so as to realize that the COREX slag can be recycled and reused, and avoid waste of resources and damage to the environment. pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The COREX slag and grinding aid are added to the vertical mill for synchronous drying and grinding. The finely ground powder enters the high-efficiency powder separator for powder selection, and the selected coarse powder is returned to the vertical mill to continue grinding. , the selected fine powder is COREX slag micropowder, and the grinding aid is flue gas desulfurization gypsum, wherein SO 3 The content of slag is more than 40%, the addition amount is 0.5-5.0% of the weight of COREX slag, and the specific surface area is controlled to be 430±10m during powder selection. 2 / kg.

[0023] The test results show that: the COREX slag micropowder obtained by the above recovery treatment method has good workability, the 28 activity index reaches 110-117%, and the fluidity ratio to cement reaches 105-112%.

Embodiment 2

[0025] Prepare 350kg / m of COREX slag micropowder obtained by processing in Example 1 3 Cementitious material, the specific formula is as follows:

[0026] COREX slag powder 90kg / m 3

[0027] Fly ash 60kg / m 3

[0028] Cement 200kg / m 3

[0029] Add water reducer 3.5kg / m 3

[0030] Additional water 170kg / m 3 .

[0031] The fly ash is preferably Class C Class II fly ash, the cement is preferably PO42.5 ordinary Portland cement, and the water reducing agent is preferably a naphthalene-based superplasticizer.

Embodiment 3

[0034] Prepare 350kg / m of COREX slag micropowder obtained by processing in Example 1 3 Cementitious material, the specific formula is as follows:

[0035] COREX slag powder 130kg / m 3

[0036] Fly ash 70kg / m 3

[0037] Cement 150kg / m 3

[0038] Add water reducer 2.75kg / m 3

[0039] Additional water 180kg / m 3 .

[0040] The fly ash is preferably Class C Class II fly ash, the cement is preferably PO42.5 ordinary Portland cement, and the water reducing agent is preferably a naphthalene-based superplasticizer.

[0041] The test result shows: according to this embodiment 350kg / m 3 The strength of the concrete prepared by the formula of the cementitious material after natural curing for 28 days is 40Mpa.

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Abstract

The invention discloses a method for recycling slag from non-blast furnace ironmaking by a COREX smelting reduction process, which comprises the following steps that: firstly, COREX slag is processed into COREX slag powder; and the COREX slag powder is used in a gelatinous material for preparing concrete. After the concrete is naturally cured for 28 days, the strength of the concrete prepared by the formula of the 350 kg / m<3> gelatinous material disclosed by the invention reaches 32 to 48MPa, and the strength grade of the concrete reaches C30 to C40. Therefore, the method solves the problem of difficult COREX slag recycling and avoids resources waste and environmental pollution. And the recycling method is simple, easy to implement and practical and creates remarkable social, economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for recovering and treating non-blast furnace ironmaking slag, in particular to a method for recovering and treating non-blast furnace ironmaking slag by COREX smelting reduction method. Background technique [0002] Steel products are the most important structural materials in human society, and also the functional materials with the largest output and the widest coverage. Steel products will remain a very important and irreplaceable material for the foreseeable future. In recent years, with the rapid and stable growth of my country's economy, the iron and steel industry has achieved unprecedented development. In 2005, my country's crude steel output exceeded 300 million tons, most of which came from the blast furnace-converter process. After hundreds of years of development, the blast furnace ironmaking process has become more and more mature. Even so, the blast furnace process also has some problems: complex proce...

Claims

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Application Information

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IPC IPC(8): C21B3/06
CPCY02P10/20Y02W30/50
Inventor 刘建生许菊祥唐丽萍刘百臣耿立志康明丁建华李建华田广亚徐莉曹黎颖赵玉静
Owner BAOSHAN IRON & STEEL CO LTD
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