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Blast furnace dust recycling utilization method

A blast furnace dust removal and recycling technology, applied in the field of solid waste recycling, can solve problems such as land occupation and environmental pollution of blast furnace dust removal, and achieve the effect of strong adsorption capacity

Active Publication Date: 2015-03-11
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a resource utilization method of blast furnace dust removal ash, which not only solves the environmental pollution and land occupation problems of blast furnace dust removal dust, but also realizes the advanced treatment of coking biochemical external drainage, reducing the treatment of coking wastewater cost

Method used

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  • Blast furnace dust recycling utilization method

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Experimental program
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Effect test

Embodiment 1

[0027] 1) Sieve the blast furnace dust removal dust, and sieve out the blast furnace dust removal dust whose particle size is 200 mesh;

[0028] 2) Combine the sieved blast furnace dust with (NH 4 )HCO 3 Mix according to the mass ratio of 6:1, then add water with a mass fraction of 8% and tar residue with a mass fraction of 10% as a binder, stir and mix, extrude and granulate to make spherical granules, granules The diameter is 3.0mm:

[0029] 3) Place the particles obtained in step 2) in an oven at 80° C. for 30 minutes and then transfer them to a muffle furnace. 2 In the medium, the temperature was raised to 450°C at a heating rate of 15°C / min, and then roasted for 30 minutes, and the iron-carbon micro-electrolytic particles were obtained by sintering, and then heated in N 2 Cool to room temperature under atmosphere and set aside;

[0030] 4) Put 10g of the iron-carbon micro-electrolysis particles obtained in step 3) into 100ml of coking biochemical external drainage, ad...

Embodiment 2

[0035] 1) Sieve the blast furnace dust removal dust, and sieve out the blast furnace dust removal dust whose particle size is 200 mesh;

[0036] 2) Combine the sieved blast furnace dust with (NH 4 )HCO 3 Mix according to the mass ratio of 10:1, then add water with a mass fraction of 15% and tar residue with a mass fraction of 25% as a binder, stir and mix, extrude and granulate to make spherical particles, granules The diameter is 1.5mm:

[0037] 3) Place the particles obtained in step 2) in an oven at 60° C. for 40 minutes and then transfer them to a muffle furnace. 2 In the medium, the temperature was raised to 700°C at a heating rate of 10°C / min, and then roasted for 60 minutes, and the iron-carbon micro-electrolytic particles were obtained by sintering, and then in N 2 Cool to room temperature under atmosphere and set aside;

[0038]4) Put 10g of the iron-carbon micro-electrolysis particles obtained in step 3) into 100ml of coking biochemical external drainage, adjust ...

Embodiment 3

[0042] 1) Sieve blast furnace dedusting ash, and sieve out blast furnace dedusting ash whose particle size is 300 mesh;

[0043] 2) Combine the sieved blast furnace dust with (NH 4 )HCO 3 Mix according to the mass ratio of 8:1, then add water with a mass fraction of 12% and tar residue with a mass fraction of 16% as a binder, stir and mix, extrude and granulate to make spherical particles, granules The diameter is 2.5mm:

[0044] 3) Place the particles obtained in step 2) in an oven at 60°C for 30 minutes and then transfer them to a muffle furnace. 2 In the medium, the temperature was raised to 500°C at a heating rate of 12°C / min, and then roasted for 60 minutes, and the iron-carbon micro-electrolytic particles were obtained by sintering, and then in N 2 Cool to room temperature under atmosphere and set aside;

[0045] 4) Put 10g of the iron-carbon micro-electrolysis particles obtained in step 3) into 100ml of coking biochemical external drainage, adjust the pH value to 4,...

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Abstract

The invention discloses a blast furnace dust recycling utilization method, which comprises the following steps: 1) screening out blast furnace dust with the diameter of 200-400 mesh; 2) mixing the blast furnace dust and ammonium salt in the ratio of 6-10:1, then adding water and tar slag for granulate into particles with the particle size of 1.5-3.0mm; 3) after drying the particles at 60 to 80 DEG C for 25-40min, transferring into a muffle furnace, heating to 400 to 700 DEG C in 10 to 15 DEG C / min speed for roasting for 30min-1H to prepare iron carbon micro electrolysis particles; and 4) pouring the iron carbon micro electrolysis particles into coking biochemical efflux water, adjusting the PH value to 3-5 for fully degrading organic matters, then adjusting the pH value to 6-9 for the removal of precipitate to complete advanced treatment; or putting the iron carbon micro electrolysis particles into a three-dimensional electrode reactor to be used as a particle electrode for treatment of the coking biochemical efflux water. The blast furnace dust recycling utilization method not only solves the problems of blast furnace dust environmental pollution and land occupation, also realizes the advanced treatment of the coking biochemical efflux water, and greatly reduces the processing cost.

Description

technical field [0001] The invention relates to solid waste recycling technology, in particular to a resource recycling method for blast furnace dust removal. Background technique [0002] Blast furnace dust refers to the dust discharged together with blast furnace gas during the ironmaking process. Generally, 20-60kg of blast furnace dust will be produced for each ton of iron produced. The blast furnace dust contains 25% to 45% of carbon and 15% of iron. % to 30%, because the amount of blast furnace dust removal is large, and it contains more environmental pollutants, which will cause a large area and environmental pollution problems. Therefore, it is necessary to make reasonable use of blast furnace dust removal. At present, the main method of using blast furnace dust is to mix it into the ingredients of sinter and pellets as sintering raw material. However, due to the small particle size of the dust and the harmful elements and impurities of alkali metals such as Zn and N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461
CPCC02F1/46114C02F2101/32C02F2101/345C02F2103/16C02F2209/08
Inventor 张垒王丽娜付本全刘璞刘尚超薛改凤余刚强王凯军刘霞
Owner 武汉钢铁有限公司
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