Method for extracting zinc from blast furnace gas mud

A technology for blast furnace gas mud and gas ash, which is applied in the field of recovery and treatment of ironmaking tailings, can solve the problems of high exhaust gas temperature, prolonged production kiln period and high production cost, and achieves overcoming large equipment, reducing production cost and shortening Effects of processing cycles

Active Publication Date: 2015-11-25
武汉钢铁有限公司
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Problems solved by technology

The main problems in the treatment of zinc-containing dust in the rotary hearth furnace are the high exhaust gas temperature and low thermal efficiency, and at the same time, zinc vapor condensation blocks the exhaust channel, resulting in unsmooth production;
[0007] (3) Oxycup dust treatment process: Oxycup shaft furnace adopts internal coal blending briquettes. In order to ensure sufficient strength, cement needs to be used as a binder. The advantages of the shaft furnace are high thermal efficiency, sufficient reduction of metal oxides, and high metal recovery rate. The disadvantage is that the coke ratio is high (3 times that of ordinary blast furnace ironmaking), the utilization factor is low, and the content of S and P in molten iron is high
[0009] 1) It affects the life of the blast furnace. Zinc oxide is reduced under the action of reducing gas to form zinc vapor that penetrates into the furnace lining, causing abnormal expansion and embrittlement of the furnace lin

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  • Method for extracting zinc from blast furnace gas mud

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Effect test

Embodiment 1

[0051] A method for dezincification from blast furnace gas mud, comprising the following steps:

[0052] 1) Insulate and bake the gas mud at a temperature of 150°C for 2 hours to obtain gas ash, and measure the fixed carbon content in the gas ash to be 21.83%;

[0053] 2) sieving the gas ash obtained in step 1) to obtain gas ash with a particle size less than 10 mm;

[0054] 3) Put the sieved gas ash in the shaft furnace, and the flow rate into the shaft furnace is 0.20m 3 / h of nitrogen protection, and the shaft furnace starts from room temperature and raises the temperature to 1100°C at a rate of 5°C / min; 3 / h of compressed air for 20 minutes of reduction reaction, after the reaction is completed, the compressed air is turned off, and the flow rate is 0.20m again 3 Nitrogen protection for / h; Simultaneous reduction reaction to obtain zinc-containing gas;

[0055] 4) Step 3) The gas containing zinc is discharged from the shaft furnace together with the gas under the action...

Embodiment 2

[0058] A method for dezincification from blast furnace gas mud, comprising the following steps:

[0059] 1) Insulate and bake the gas mud at a temperature of 150°C for 2 hours to obtain gas ash, and measure the fixed carbon content in the gas ash to be 22.15%;

[0060] 2) sieving the gas ash obtained in step 1) to obtain gas ash with a particle size less than 10 mm;

[0061] 3) Put the sieved gas ash in the shaft furnace, and the flow rate into the shaft furnace is 0.20m 3 / h of nitrogen protection, and the shaft furnace starts from room temperature and raises the temperature to 1150°C at a rate of 5°C / min; 3 / h of compressed air for 20 minutes of reduction reaction, after the reaction is completed, the compressed air is turned off, and the flow rate is 0.20m again 3 Nitrogen protection for / h; Simultaneous reduction reaction to obtain zinc-containing gas;

[0062] 4) Step 3) The gas containing zinc is discharged from the shaft furnace together with the gas under the action...

Embodiment 3

[0065] A method for dezincification from blast furnace gas mud, comprising the following steps:

[0066] 1) Insulate and bake the gas mud at a temperature of 150°C for 2 hours to obtain gas ash, and measure the fixed carbon content in the gas ash to be 22.15%;

[0067] 2) sieving the gas ash obtained in step 1) to obtain gas ash with a particle size less than 10 mm;

[0068] 3) Put the sieved gas ash in the shaft furnace, and the flow rate into the shaft furnace is 0.20m 3 / h of nitrogen protection, and start the shaft furnace from room temperature, and raise the temperature to 1200°C at a rate of 5°C / min; 3 / h of compressed air for 30 minutes of reduction reaction, after the reaction is completed, the compressed air is turned off, and the flow rate is 0.20m again 3 Nitrogen protection for / h; Simultaneous reduction reaction to obtain zinc-containing gas;

[0069] 4) Step 3) The gas containing zinc is discharged from the shaft furnace together with the coal gas under the ac...

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Abstract

The invention discloses a method for extracting zinc from blast furnace gas mud. The method comprises the steps of drying the gas mud to obtain gas ash, placing screened gas ash in a shaft furnace, introducing nitrogen to the shaft furnace for protection, and heating the shaft furnace to a temperature between 1050 DEG C and 1200 DEG C from room temperature; conducting reduction reaction to obtain gas containing zinc; introducing the gas to a sedimentation chamber for dust removal; obtaining polymorphic zinc mixed gas, and introducing the mixed gas to a coiled cooling pipe to be cooled so that a crude zinc product can be obtained. Through self-reduction reaction of fixed carbon contained in the gas mud at the temperature of 1050-1200 DEG C, the number of procedures is reduced, the gas mud processing cycle is shortened, and production cost is reduced; meanwhile, the requirement for the amount of reduction carbon and heating carbon required by reducing zinc in the gas mud can be met, complete reduction of zinc in the gas mud is guaranteed, and then harm to iron making equipment and iron production caused by zinc existing during gas mud recycling is greatly relieved.

Description

technical field [0001] The invention relates to a recovery and treatment process for ironmaking tailings produced in the ironmaking process, in particular to a method for dezincification from blast furnace gas mud. Background technique [0002] Gas mud is the ironmaking tailings formed by the collection of fine dust or ashes (gas ash) produced in the process of blast furnace ironmaking through dust collection and water washing. Because gas mud contains a lot of iron and carbon (1 / 4 to 1 / 3 of iron and carbon content respectively), gas mud can be used as a good iron-making raw material for recycling, which can save some coal resources At the same time, it can greatly reduce the cost of gas ash transportation and storage, and avoid serious environmental pollution caused by the disposal of gas ash, which has far-reaching economic and environmental significance. [0003] Usually, iron and steel enterprises use the collected gas sludge as sintering raw materials for recycling wit...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B19/30
CPCY02P10/20
Inventor 李红欧阳德刚鲁新义李明晖陈令坤胡正刚李勇波陈华余珊珊王素平
Owner 武汉钢铁有限公司
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