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Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof

A production method and by-product technology, which are applied in the field of smelting reduction iron-smelting iron-containing solid by-products and their production fields, can solve problems such as inability to meet strength requirements, and achieve the effects of realizing the cost of molten iron, avoiding a large amount of accumulation, and increasing the output of molten iron.

Active Publication Date: 2012-09-05
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the experimental exploration stage of iron-containing solid by-products of smelting reduction ironmaking, pelletizing and counter-roll briquetting methods were used, and it was found that the agglomerates (spheroid and ellipsoid in appearance) obtained by the two methods were cured. The strength is only 200-400N / piece, which cannot meet the strength requirements

Method used

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  • Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof
  • Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Gas mud: iron ore sieve powder: dust removal powder (dry basis, weight) 20%: 75%: 5%, binder, added, 10%, water, added, adjusted to 8%. The above-mentioned materials are mixed, and the mixture is pressed by a hydraulic molding machine. The pressure of the molding machine is 10 MPa, and the pressurization time is 10s. It is placed in the air for natural curing for 28 days. The binder is 90% ordinary Portland cement + 10% high alumina cement, and the particle size of the iron ore under-sieve powder is less than 6.3mm, and the content greater than 1mm is 70%.

[0052] After curing, the compressive strength of the agglomerates is 1920N / piece, and the strength reaches the metallurgical standard YB / T005-2005 secondary iron pellet ore standard, which meets the strength requirements for directly adding to the gasifier (>1800N / piece). It can be fed into the gasifier together with lump coal and coke through the coal spiral. Calculated by using 300 tons of agglomerates per day, 13...

Embodiment 2

[0054] Gas mud: iron ore sieve powder: dust removal powder (dry basis, weight) 37%: 60%: 3%, binder, added, 18%, water, added, adjusted to 11%. The above-mentioned materials are mixed, and the mixture is pressed by a hydraulic molding machine. The pressure of the molding machine is 10 MPa, and the pressurization time is 10s. It is placed in the air for natural curing for 28 days. The binder is 80% ordinary Portland cement + 20% slag cement, and the particle size of the iron ore under-sieve powder is less than 6.3mm, and the content of the powder greater than 1mm is 70%.

[0055] After curing, the compressive strength of the agglomerates is 1956N / piece, and the strength reaches the metallurgical standard YB / T005-2005 second-grade iron pellet ore standard, meeting the strength requirements for directly adding to the gasifier (>1800N / piece). It can be fed into the gasifier together with lump coal and coke through the coal spiral. Calculated by using 300 tons of agglomerates a day...

Embodiment 3

[0057] Gas mud: iron ore sieve powder: dust removal powder (dry basis, weight) 43%: 53%: 4%, binding agent, add, 22%, water, add, adjust to 12%. The above-mentioned materials are mixed, and the mixture is pressed by a hydraulic molding machine. The pressure of the molding machine is 10 MPa, and the pressurization time is 10s. It is placed in the air for natural curing for 28 days. The binder is 80% ordinary Portland cement + 10% high alumina cement + 10% lime, and the particle size of the iron ore under-sieve powder is less than 6.3mm, and the content greater than 1mm is 70%.

[0058] After curing, the compressive strength of the agglomerates is 1868N / piece, and the strength reaches the metallurgical standard YB / T005-2005 second-grade iron pellet ore standard, meeting the strength requirements for directly adding to the gasifier (>1800N / piece). It can be fed into the gasifier together with lump coal and coke through the coal spiral. Calculated by using 300 tons of agglomerates...

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Abstract

The invention relates to an iron-containing solid byproduct of iron making by smelting reduction and a manufacturing method thereof. The byproduct comprises the following components in percentage by weight: 20-75% of dry basis of gas mud, 20-75% of dry basis of iron ore minus undersize powder, 1-5% of dedusting powder dry basis, 10-30% of binding agent and 8-15% of water. The byproduct and the manufacturing method provided by the invention finally realize the reutilization of smelted ironmaking sludge, can manufacture the iron-containing product conglomerations for smelting reduction, reduce the molten iron cost, and reduce environmental pollution.

Description

technical field [0001] The invention belongs to the field of smelting reduction ironmaking, and relates to an iron-containing solid by-product of smelting reduction ironmaking and a production method thereof. Background technique [0002] The smelting reduction ironmaking process is an environmentally friendly non-blast furnace ironmaking process, and its main raw materials are pellets, lump ore, lump coal and a small amount of coke. Since smelting reduction ironmaking cancels the pre-iron processes such as sintering and coking, compared with blast furnace ironmaking, the exhaust gas of SO 2 , NOX, dust reduced by 95%, 87%, 64%; phenol and sulfide in wastewater reduced by 99%, ammonia reduced by 87%. However, while the emission of harmful substances in waste gas and wastewater has been greatly reduced, the recovery of its iron-containing solid by-products has become a new problem because there is no sintering or pelletizing process. [0003] Table 1 Properties and amount o...

Claims

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Application Information

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IPC IPC(8): C22B1/248C22B1/243C21B11/00C21B11/02
Inventor 李建熊林赵晓岩石洪志朱锦明林金嘉彭新李咸伟王如意
Owner XINJIANG BAYI IRON & STEEL
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