A method of utilizing corex melting to reduce dedusting coal powder

A technology for pulverized coal and anthracite, which is applied in the field of using COREX smelting reduction and dedusting pulverized coal, can solve the problems of complex process and high cost, achieve high value, save the cost of blast furnace coal, and achieve good economic and environmental benefits.

Active Publication Date: 2017-12-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN102533374A proposes the use of smelting reduction dust removal coal powder and dust removal ore powder mixed with pulverized coal to add additives to make briquettes, which can be reused in smelting reduction furnaces, which also achieves the purpose of using dust removal powder, but the process is more complicated and the cost is relatively high. high

Method used

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  • A method of utilizing corex melting to reduce dedusting coal powder

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Experimental program
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Effect test

Embodiment 1

[0021] The dedusted coal powder (Ad=11%, VMd=32%) less than 1mm and the anthracite (Ad=6%, VMd=6%) less than 10mm are mixed in proportion, and the proportion of dedusted coal powder accounts for the proportion of dedusted powder 5% of the mass ratio of the mixture of dust-removed coal and anthracite, put the mixture of dedusted coal powder and anthracite into the coal pulverizer to fully grind, and transport the pulverized coal to the cyclone separator through the exhaust gas of the hot blast stove and the pneumatic conveying pipeline, and then enter the coal The powder silo, then enters the tundish tank and the injection tank, and then injects the pulverized coal into the blast furnace through the coal injection gun for coal injection operation. After testing the performance of the pulverized coal, its injection performance is as follows: pulverized coal grindability index HGI 70, the combustion rate of pulverized coal is 65, and the conveying speed of pulverized coal is 265g / ...

Embodiment 2

[0023] The dedusted coal powder (Ad=13%, VMd=35%) smaller than 1mm and the anthracite (Ad=10%, VMd=7%) smaller than 10mm are mixed in proportion, and the ratio of the dedusted coal powder accounts for the dedusted powder 10% of the mass ratio of the mixture of dust-removed coal and anthracite, put the mixture of dust-removed coal powder and anthracite into the coal pulverizer and grind it fully, and the pulverized coal will be transported to the cyclone separator through the exhaust gas of the hot blast stove and the pneumatic conveying pipeline, and then enter the coal The powder silo, then enters the tundish tank and the injection tank, and then injects the pulverized coal into the blast furnace through the coal injection gun for coal injection operation. After testing the performance of the pulverized coal, its injection performance is as follows: pulverized coal grindability index HGI 67, the combustion rate of pulverized coal is 63, and the pulverized coal delivery speed i...

Embodiment 3

[0025] The dedusted coal powder (Ad=14%, VMd=34%) smaller than 1mm and the anthracite (Ad=8%, VMd=8%) smaller than 10mm are mixed in proportion, and the proportion of dedusted coal powder accounts for the dedusted powder 15% of the mass ratio of the mixture of dust-removed coal and anthracite, put the mixture of dust-removed coal powder and anthracite into the coal pulverizer and grind it fully, and the pulverized coal will be transported to the cyclone separator through the exhaust gas of the hot blast stove and the pneumatic conveying pipeline, and then enter the coal The powder silo, then enters the tundish tank and the injection tank, and then injects the pulverized coal into the blast furnace through the coal injection gun for coal injection operation. After testing the performance of the pulverized coal, its injection performance is as follows: pulverized coal grindability index HGI 64, the combustion rate of pulverized coal is 61, and the conveying speed of pulverized co...

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Abstract

A method for conducting melting reduction on dust removal pulverized coal through COREX includes the specific steps of firstly, distributing the dust removal pulverized coal into anthraciferous coal, smashing the dust removal pulverized coal, and using the smashed dust removal pulverized coal for blast furnace coal injection; secondly, adding the mixture of the dust removal pulverized coal and the anthraciferous coal into a coal mill to be sufficiently levigated; thirdly, conveying the levigated pulverized coal to a cyclone separator through a pneumatic conveying pipeline, making the levigated pulverized coal enter a pulverized coal bin and then enter an intermediate tank and an injection tank, and injecting the pulverized coal into a blast furnace through an injection pulverized coal gun. The dust removal pulverized coal is innovatively used for the blast furnace coal injection process, utilization of the dust removal pulverized coal used for melting reduction has higher value, and new cost saving possible is provided for melting reduction production enterprises on the aspect of dust removal pulverized coal utilization.

Description

technical field [0001] The invention relates to the recycling technology of smelting reduction dust waste in the field of metallurgy, and more specifically, relates to a method for using COREX smelting reduction of dust-removed coal powder. Background technique [0002] Due to increasingly stringent environmental protection requirements, smelting reduction technology has attracted widespread attention because it does not require two processes of coking and sintering. The smelting reduction ironmaking process is currently the only new industrialized smelting reduction ironmaking process, which can directly use lump coal, and can also use a large amount of lump ore. The smelting reduction ironmaking process currently being produced in my country is the largest in the world. However, during the production process of the smelting reduction furnace in the iron factory, a large amount of dust-removing coal powder will be produced during the process of transporting the lump coal in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C21B3/04
CPCY02W30/50
Inventor 王玉明毛晓明胡德生钱晖徐万仁
Owner BAOSHAN IRON & STEEL CO LTD
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