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Resource utilization method of electric furnace bag dusting ash

A technology of bag dust removal and resource utilization, which is applied in the direction of furnaces, furnace types, hearth type furnaces, etc., can solve the problems that cannot be completely applied to the current situation of bag dust removal and ash treatment of zinc-containing electric furnaces, and achieves the benefits of comprehensive utilization of resources and production costs. Low, beneficial to the effect of environmental protection

Inactive Publication Date: 2019-07-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electric furnace ash is mainly used for the direct reduction of iron in the rotary bottom reduction furnace, and the direct extraction of zinc oxide in the blast furnace. However, due to the original ratio, thermal design and other reasons, these processes or devices are not completely suitable for zinc-containing electric furnaces in my country. The status quo of bag dust removal ash treatment

Method used

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  • Resource utilization method of electric furnace bag dusting ash
  • Resource utilization method of electric furnace bag dusting ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for resource utilization of electric furnace bag dust removal ash, comprising the following steps:

[0032] a) Mix electric furnace bag dust, coke powder and 901 glue, the amount of carbon powder added is 15% of the mass of electric furnace bag dust, and the amount of 901 glue is 10% of the mass of electric furnace bag dust. Stir at a speed of min for 20 minutes, stir evenly, put it into a pelletizing machine for pelletizing, and obtain semi-finished iron-carbon pellets.

[0033] b) Naturally curing the finished semi-finished iron-carbon spheres for 5 days, or drying the semi-finished iron-carbon spheres at an ambient temperature of 105°C for 4 hours; making the semi-finished iron-carbon spheres have a compressive strength of 1000-1800N / piece.

[0034] c) The dried iron-carbon balls are placed in a rotary bottom reduction furnace for heating and reduction. Control the temperature of the rotary bottom reduction furnace at 1200°C and keep it warm for 30 minutes t...

Embodiment 2

[0039] A method for resource utilization of electric furnace bag dust removal ash, comprising the following steps:

[0040]a) Mix the electric furnace bag dust removal ash, coke powder and 42.5 ordinary silicon cement (more than 80% of the particle size is 200 mesh). It is 9% of the mass of the electric furnace bag dedusting ash, and water with 10% of the mass of the electric furnace bag dedusting ash is added, stirred at a speed of 200r / min for 8 minutes, stirred evenly, and put into a pelletizing machine for pelletizing to obtain semi-finished iron carbon balls.

[0041] b) Naturally curing the finished semi-finished iron-carbon spheres for 7 days, or drying the semi-finished iron-carbon spheres at an ambient temperature of 110°C for 4 hours; making the semi-finished iron-carbon spheres have a compressive strength of 1000-1800N / piece.

[0042] c) Put the dried iron-carbon spheres into the rotary bottom reduction furnace for heating and reduction. Control the temperature of t...

Embodiment 3

[0047] A method for resource utilization of electric furnace bag dust removal ash, comprising the following steps:

[0048] a) Mix the electric furnace bag dust removal ash, coke powder and 42.5 ordinary silicon cement (more than 80% of the particle size is 200 mesh), the amount of coke powder added is 10% of the mass of the electric furnace bag dust removal ash, and the amount of 42.5 ordinary silicon cement It is 9% of the mass of the electric furnace bag dedusting ash, and water with 10% of the mass of the electric furnace bag dedusting ash is added, stirred at a speed of 60r / min for 25min, stirred evenly, put into a pelletizing machine for pelletizing, and semi-finished iron carbon pellets are obtained.

[0049] b) Naturally curing the finished semi-finished iron-carbon spheres for 7 days, or drying the semi-finished iron-carbon spheres at an ambient temperature of 105°C for 4 hours; making the semi-finished iron-carbon spheres have a compressive strength of 1000-1800N / piec...

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Abstract

The invention provides a resource utilization method of electric furnace bag dusting ash. The resource utilization method of the electric furnace bag dusting ash comprises the following steps that a)adding a reducing agent, a binder and water into the electric furnace bag dusting ash, uniformly stirring is performed, and putting the mixture into a pelletizing machine for pelletizing to obtain a semi-finished iron carbon ball; b) naturally curing the prepared semi-finished iron carbon ball or drying the prepared semi-finished iron carbon ball at 105-110 DEG C; and c) putting the dried iron carbon ball into a rotary-bottom reduction furnace for heating and reducing, controlling the temperature of the rotary-bottom reduction furnace to be 1100-1400 DEG C, carrying out heat preservation for 25-45 minutes, collecting volatile smoke dust and reducing furnace slag, and collecting the collected smoke dust as a crude zinc product. According to the method, the zinc element is reduced by using the electric furnace bag dusting ash, the zinc element is subjected to air re-oxidation, then the purpose of extracting and recovering the zinc element is achieved, heavy metal indexes of residual slagafter zinc extraction reach the national waste discharge standard, and the goal of zero emission treatment of solid waste is realized.

Description

technical field [0001] The invention relates to the technical field of recovery of zinc-containing electric furnace bag dust removal ash, in particular to a resource utilization method of electric furnace bag dust removal ash. Background technique [0002] Furnace ash is the product of electric furnace fume dust enrichment and collection in the process of electric furnace steelmaking, and the flue gas pipeline is finally collected by bag filter. 1% to 2% of the dust generated by electric arc furnace steelmaking is electric furnace dust. Electric furnace ash contains a large amount of TFe, accounting for about 40% to 60%, and is rich in Zn element. It is an important secondary resource containing a variety of metals. [0003] In 2015, my country's electric furnace steelmaking has reached 80 million tons, producing 800,000 to 1.6 million tons of electric furnace ash. These electric furnace ashes contain a large amount of valuable elements, but most of them exist in the form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B7/02C22B5/10C22B19/00C21B11/08C03C13/06C03B37/04
CPCC03B37/04C03C13/06C21B11/08C22B1/2406C22B1/242C22B5/10C22B7/001C22B7/02C22B19/00Y02P10/20
Inventor 李灿华霍程程王昭然黄贞益于巧娣常婕王浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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