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Method for recycling coke in process of preparing iron carbide by using blast furnace fly ash

A blast furnace dust and iron carbide technology, applied in the field of metallurgy, can solve the problem that coke cannot be recycled

Active Publication Date: 2020-10-27
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the process of preparing iron carbide with blast furnace dust, a large amount of coke in blast furnace dust cannot be recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Blast furnace dust: iron grade 37.29%, carbon content 31.2%.

[0057] Add 6% sodium sulfate and 2% sodium hydroxide to blast furnace dust, and then prepare green balls with a diameter of 8-16mm in a disc pelletizer. After drying the green pellets in CO:CO 2 :H 2 In the mixed gas of 60:20:20, carburizing treatment was carried out at 650°C for 180 minutes, and the hot ball was cooled in nitrogen.

[0058] The cooled pellets are ball-milled in a conical ball mill with a pulp concentration of 50% until the milling fineness is 70% and less than 500 mesh, and then the ball-milled pulp is magnetically separated in a magnetic separator with a magnetic field strength of 150mT. The tailings after magnetic separation are filtered to obtain a filter cake. Then add 2mol / L sulfuric acid solution, adjust the liquid-solid ratio to 10:1, after leaching for 20min; filter to obtain coke concentrate.

[0059] After detection and calculation, the grade of the coke concentrate is 88.2%, ...

Embodiment 2

[0061] Blast furnace dust: iron grade 37.2%, carbon content 34.1%.

[0062] Add 6% sodium carbonate and 2% sodium hydroxide to blast furnace dust, and then prepare green balls with a diameter of 8-16 mm in a disc pelletizer. After drying the raw balls in CH 4 :H 2 In the mixed gas of 80:20, carburize at 800°C for 60 minutes, and cool the hot ball in nitrogen.

[0063] The cooled pellets are ball-milled in a conical ball mill with a pulp concentration of 50% until the milling fineness is 70% and less than 500 mesh, and then the ball-milled pulp is magnetically separated in a magnetic separator with a magnetic field strength of 160mT. The tailings after magnetic separation are filtered to obtain a filter cake. Then add 2mol / L sulfuric acid solution, adjust the liquid-solid ratio to 15:1, after leaching for 20min; filter to obtain coke concentrate.

[0064] After detection and calculation, the grade of the coke concentrate is 88.9%, and the recovery rate of coke is 89.1%.

Embodiment 3

[0066] Blast furnace dust: iron grade 32.2%, carbon content 28.1%.

[0067] Add 8% sodium sulfate to blast furnace dust, and then prepare green balls with a diameter of 8-16mm in a disc pelletizer. After drying the green balls, bake them at 1000°C for 30 minutes under nitrogen atmosphere, and then dry the green balls in CO:CO 2 :H 2 In the mixed gas of 60:20:20, carburizing treatment was carried out at 650°C for 180 minutes, and the hot ball was cooled in nitrogen.

[0068] The cooled pellets are ball-milled in a conical ball mill with a pulp concentration of 50% until the milling fineness is 70% and less than 500 mesh, and then the ball-milled pulp is magnetically separated in a magnetic separator with a magnetic field strength of 160mT. The tailings after magnetic separation are filtered to obtain a filter cake. Then add 1.5mol / L sulfuric acid solution, adjust the liquid-solid ratio to 15:1, after leaching for 25min; filter to obtain coke concentrate.

[0069] After dete...

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PUM

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for recycling coke in the process of preparing iron carbide by using blast furnace fly ash. The methodcomprises the following steps that the blast furnace fly ash and a gangue reactant are uniformly mixed to prepare green balls; the green balls are subjected to carburizing treatment to obtain carburized mineral aggregate; the carburized mineral aggregate is subjected to ball milling and magnetic separation; tailings obtained after magnetic separation are filtered to obtain a filter cake; the filter cake is impregnated in an acid solution and filtered to obtain coke concentrate; and the acid solution is selected from sulfuric acid, hydrochloric acid or aqua regia. According to the method for recycling the coke in the process of preparing the iron carbide by using the blast furnace fly ash, the carburization product of the blast furnace fly ash and the coke can be efficiently separated, moreover, the coke can be effectively recycled, high-grade and high-recycling-rate coke is obtained, coke resources can be effectively recycled, the economic benefit of the carburization method for treating the blast furnace fly ash can be improved, and efficient utilization of the blast furnace fly ash is promoted.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for recovering coke in the process of preparing iron carbide from blast furnace dust. Background technique [0002] During the production of pig iron, the blast furnace will produce a large amount of dust (ie blast furnace dust). Blast furnace dust mainly contains 25-40% iron and 15-35% coke, which is a large and important metallurgical secondary resource. [0003] At present, blast furnace dust is mainly returned to sintering treatment for the preparation of sinter, and a small part of it is prepared into pre-reduction pellets through high-temperature pre-reduction treatment. However, the sintered ore or pre-reduced pellets prepared by returning to sintering and high-temperature pre-reduction have the problem of relatively low added value. In addition to these two processes, blast furnace dust can also be prepared into iron carbide through the carburizing process. Ir...

Claims

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Application Information

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IPC IPC(8): C22B7/02C21B3/04C22B1/248
CPCC22B7/02C22B7/007C22B7/002C21B3/04C22B1/248Y02W30/50Y02P10/20Y02P10/143
Inventor 陈栋国宏伟陈锁张元元李承泽
Owner SUZHOU UNIV