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Comprehensive utilization technology of blast furnace gas ash

A blast furnace gas ash and process technology, applied in the field of mineral processing, can solve the problems of high alkali metal content, zinc enrichment affecting the normal operation of blast furnace, etc.

Inactive Publication Date: 2018-09-21
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a comprehensive utilization process of blast furnace gas ash to solve the problems that the content of alkali metals such as zinc oxide in blast furnace gas ash is high, and the zinc enrichment caused by sintering and direct back-mixing affects the normal operation of the blast furnace.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The blast furnace gas ash with 25% iron grade, 3.6% ZnO content and 47% C content is subjected to the following treatment:

[0025] Step 1. Use a spiral dry-type magnetic separator with a field strength of 2000Oe to carry out weak magnetic iron extraction on blast furnace gas ash. The grade of weak magnetic concentrate is 57%, the yield of concentrate is 16%, the grade of tailing ash iron is 18.9%, and the yield of tailing ash 84%;

[0026] Step 2, the weak magnetic separation tail ash that step 1 obtains adopts the spiral dry type magnetic separator of field strength 8000Oe to carry out strong magnetic separation, and the grade of strong magnetic concentrate is 54%, productive rate 14%, comprehensive yield 11.76%, strong magnetic The tail gray iron grade is 13.19%, the yield is 86%, and the comprehensive yield is 72.24%;

[0027] The iron grade of the strong magnetic tail ash and carbon concentrate obtained in step 3 and step 2 is 13.19%, the ZnO content is increased ...

Embodiment 2

[0032] The blast furnace gas ash with 30% iron grade, 2.8% ZnO content and 42% C content is subjected to the following treatment:

[0033] Step 1. Use a spiral dry-type magnetic separator with a field strength of 2000Oe to carry out weak magnetic iron extraction on the blast furnace gas ash. The weak magnetic concentrate grade is 58%, the concentrate yield is 20%, the tailing ash iron grade is 23%, and the tailing ash yield is 80%.

[0034] Step 2, the weak magnetic separation tail ash that step 1 obtains adopts the spiral dry magnetic separator of field strength 8000Oe to carry out strong magnetic separation. The tail gray iron grade is 16.4%, the yield is 82%, and the comprehensive yield is 65.6%.

[0035]Step 3. The iron grade of the strong magnetic tail ash and carbon concentrate obtained in step 2 is 16.4%, the ZnO content is increased from 2.8% to 4%, the C content is increased from 48% to 68.57%, and the strong magnetic tail ash is sent to the power plant at 3% Propor...

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Abstract

The invention discloses a comprehensive utilization technology of blast furnace gas ash and belongs to the technical field of mineral processing. The invention aims at solving the problems of zinc enrichment caused by higher content of alkali metal such as zinc oxide of the blast furnace gas ash and direct returning during sintering influences normal operation of a blast furnace and the like. Thecomprehensive utilization technology comprises the steps of iron increase by weak magnetism and strong magnetism, combustion reduction of a power generating boiler, cooling and zinc recovery of a bagdust collector, iron increase by fly ash and the like, so that elements such as Fe, Zn and C in the gas ash are effectively recycled; the remaining material doped with pulverized coal is burdened intothe fly ash; a mixture is completely used for cement ingredients, so that full comprehensive utilization of the blast furnace gas ash is achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a comprehensive utilization process of blast furnace gas ash. Background technique [0002] During the blast furnace smelting process, the furnace dust is drawn out from the top of the furnace along with the blast furnace gas, and after the coarse particles are removed in the gravity dust collector through the downcomer, the blast furnace gas is finely dedusted by the bag filter. The dust collected by the bag filter is called bag ash, and the dust collected by the gravity dust collector is called gravity ash. The two are collectively called gas ash. Boiling point Pb, zn oxides and alkali metal oxides are light and fine-grained substances, and are one of the main solid emissions from iron and steel enterprises. In recent years, with the expansion of the scale of blast furnace ironmaking, a large amount of blast furnace gas ash has been produced. Addition th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/16B03C1/30
CPCB03C1/30C22B1/005C22B1/16C22B7/001C22B7/02Y02P10/20
Inventor 展仁礼王欣郭忆边立国韩立芳任雪鹏
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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