Method for treating zinc-containing and carbon-containing industrial solid waste in steel production process

A technology for production process and industrial solid waste, applied in fluidized bed furnaces and other directions, can solve the problems of high reduction temperature, large process energy consumption, long reduction time, etc., and achieve high temperature reactivity, low temperature, and energy consumption. Effect

Pending Publication Date: 2021-06-25
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have the disadvantages of high reduction temperature, long reduction time, high energy consumption in the process, or the need for an external reducing agent.

Method used

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  • Method for treating zinc-containing and carbon-containing industrial solid waste in steel production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, blast furnace dust is used as zinc-containing carbon-containing industrial solid waste. The main components of blast furnace dust include: Fe: 35%, Zn: 3.53%, C: 20.6%, and the rest are impurities. The molar ratio of C / Zn in blast furnace dust is 32.6.

[0037] In this embodiment, the method for treating industrial solid waste containing zinc and carbon in the iron and steel production process specifically includes the following steps:

[0038] (1) Mechanically activate the above-mentioned blast furnace dust removal ash, and the particle size of the blast furnace dust removal dust after mechanical activation treatment is not more than 160 mesh;

[0039] (2) CaCO 31. Mix the blast furnace dust, bentonite and a small amount of water after mechanical activation treatment, and the mixed sample is pressed and formed by a press;

[0040] (3) drying the compressed mixed material at 150°C;

[0041] (4) Reducing the bulk material obtained in step (3) at a hig...

Embodiment 2

[0046] The method for processing zinc-containing solid waste and carbon-containing solid waste in the iron and steel production process in this embodiment specifically includes the following steps:

[0047] (1) Mechanically activate the above-mentioned blast furnace dedusting ash and electric furnace dedusting ash, and the particle size of the blast furnace dedusting ash after mechanical activation treatment is not more than 160 mesh;

[0048] (2) CaCO 3 , MgCO 3 and BaCO 3 According to the mass ratio of 6:3:1, the composite reduction accelerator obtained by mixing, the mixture of blast furnace dedusting ash and electric furnace dedusting ash after mechanical activation treatment, bentonite and a small amount of water are mixed evenly, and the mixed sample is pressed into shape by a press;

[0049] (3) drying the compressed mixed material at 110°C;

[0050] (4) Reducing the bulk material obtained in step (3) at a high temperature of 950° C. for 25 minutes, and recovering th...

Embodiment 3

[0054] The method for processing zinc-containing solid waste and carbon-containing solid waste in the iron and steel production process in this embodiment specifically includes the following steps:

[0055] (1) Mechanically activate the above-mentioned blast furnace dedusting ash and electric furnace dedusting ash, and the particle size of the blast furnace dedusting ash after mechanical activation treatment is not more than 160 mesh;

[0056] (2) CaCO 3 and MgCO 3 Mix the composite reduction accelerator obtained by mixing according to the mass ratio of 7:3, the mixture of blast furnace dedusting ash and electric furnace dedusting ash after mechanical activation treatment, diatom mud and a small amount of water, and mix evenly, and the mixed sample is pressed into shape by a press;

[0057] (3) drying the compressed mixed material at 200°C;

[0058] (4) Reducing the bulk material obtained in step (3) at a high temperature of 1050° C. for 10 minutes, and recovering the reduce...

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Abstract

The invention discloses a method for treating zinc-containing and carbon-containing industrial solid waste in a steel production process. The method comprises the following steps: briquettes containing a composite reduction accelerator, a binder and the zinc-containing and carbon-containing industrial solid waste obtained by mechanical activation treatment in the steel production process are reduced at 950-1050 DEG C for 10-25 minutes; a reduced gas product is recovered through a dust removal system to obtain a secondary zinc oxide product, and residues are separated through mineral separation to extract iron; wherein the briquettes are obtained by uniformly mixing the composite reduction accelerator, the binder, water and the zinc-containing and carbon-containing industrial solid waste in the steel production process and performing compression molding and drying. According to the method, by reducing the reduction temperature and reduction time, the purposes of reducing energy consumption, utilizing carbon resources in solid waste and recycling valuable metals such as zinc and iron are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a method for treating industrial solid waste containing zinc and carbon in the iron and steel production process. Background technique [0002] A large amount of solid waste containing zinc and carbon will be produced in the process of iron and steel production. How to make full use of the valuable zinc, iron and carbon resources will not only have significant environmental benefits, but also hope to generate good economic value. [0003] Zinc-containing and carbon-containing solid waste generally contains elements such as iron, zinc, and carbon. The iron content can range from 20% to 40%, the zinc content can range from 2% to 25%, and the carbon content can reach about 20%. . Compared with the zinc content of 2% to 5% in zinc ore, the zinc has a high application value for zinc extraction. At the same time, the carbon in it can be used as a reducing...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B19/34C21B13/00
CPCC22B1/243C22B19/34C21B13/0066C21B13/008C21B13/0073
Inventor 李小明王伟安邱国兴贺芸张馨艺吴育庆阮金榜
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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