Method for dezincification of zinc-containing dust through microwave hydrogen reduction

A dust and microwave technology, which is applied in the field of iron and steel metallurgy, can solve the problems of large carbon emissions, low product quality, and high energy consumption, and achieve the effects of small heat loss, increased reaction rate, and low energy consumption

Pending Publication Date: 2022-05-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of high energy consumption, large pollution, large carbon emissions and low product quality in the traditional carbothermal reduction method for zinc-containing dust, the purpose of the present invention is to provide a microwave hydrogen reduction dezincification method for zinc-containing dust, through Coupling effect of microwave and hydrogen reduction to realize green comprehensive utilization of zinc-containing dust

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  • Method for dezincification of zinc-containing dust through microwave hydrogen reduction

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Embodiment 1

[0042] The present invention is a microwave hydrogen reduction dezincification method containing zinc dust, comprising the following steps:

[0043] (1) The blast furnace dust removal ash, electric furnace dust removal ash and steelmaking converter soot are ore-blended, and the C content in the control mixture is 10%;

[0044] (2) Add 1.5% of the composite binder to the mixture (bentonite accounts for 35%, sodium humic acid accounts for 45% and polyacrylamide accounts for 30%) to mix evenly, and the resulting mixed material is strongly stirred, the stirring speed is 1500rpm, the mixing time is 3min; then, the high-pressure roller grinding is carried out sequentially, the high-pressure roller grinding water is divided into 7.5%, and the roller grinding pressure is 1.0N / mm 2 , the grinding time is 3min;

[0045] (3) The pretreated material is added to the disc ball machine for ball making, the ball making time is 12min, the moisture of the raw ball is controlled at about 13%, and th...

Embodiment 2

[0049] The present invention is a microwave hydrogen reduction dezincification method containing zinc dust, comprising the following steps:

[0050] (1) The blast furnace dust removal ash, electric furnace dust removal ash and steelmaking converter soot are mixed with ore, and the C content in the control mixture is 15%;

[0051] (2) Add 1.5% of the composite binder to the mixture (bentonite accounts for 35%, sodium humic acid accounts for 45% and polyacrylamide accounts for 30%) to mix evenly, and the resulting mixed material is strongly stirred, the stirring speed is 1500rpm, the mixing time is 3min; then, the high-pressure roller grinding is carried out sequentially, the high-pressure roller grinding water is divided into 7.5%, and the roller grinding pressure is 1.0N / mm 2 , the grinding time is 3min;

[0052] (3) The pretreated material is added to the disc ball machine for ball making, the ball making time is 12min, the raw ball moisture is controlled at about 13%, and the ra...

Embodiment 3

[0056] The present invention is a microwave hydrogen reduction dezincification method containing zinc dust, comprising the following steps:

[0057] (1) The blast furnace dust removal ash, electric furnace dust removal ash and steelmaking converter soot are ore-blended, and the C content in the control mixture is 20%;

[0058] (2) Add 1.5% of the composite binder to the mixture (bentonite accounts for 35%, sodium humic acid accounts for 45% and polyacrylamide accounts for 30%) to mix evenly, and the resulting mixed material is strongly stirred, the stirring speed is 1500rpm, the mixing time is 3min; then, the high-pressure roller grinding is carried out sequentially, the high-pressure roller grinding water is divided into 7.5%, and the roller grinding pressure is 1.0N / mm 2 , the grinding time is 3min;

[0059] (3) The pretreated material is added to the disc ball machine for ball making, the ball making time is 12min, the raw ball moisture is controlled at about 13%, and the raw b...

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Abstract

The invention discloses a method for dezincification of zinc-containing dust through microwave hydrogen reduction, which belongs to the technical field of ferrous metallurgy and comprises the following steps: S1, carrying out optimized ore blending on different types of zinc-containing dust in a steel plant to obtain an ore-blended zinc-containing dust material; s2, a binder is added into the zinc-containing dust material obtained after ore blending, powerful mixing treatment is conducted, then high-pressure roller milling and wet milling combined treatment is conducted, and a uniformly-mixed material is obtained; s3, pelletizing the uniformly mixed material to obtain green pellets, and drying to obtain dry pellets; and S4, the dry balls are put into a microwave reduction furnace to be subjected to hydrogen reduction treatment, cooling is conducted under the protective atmosphere after reduction, and reduced dezincified balls are obtained. Aiming at the characteristics of high carbon content and excellent wave-absorbing performance in the zinc-containing dust of the iron and steel plant and the characteristics of high heating speed, small heat loss, strong penetrating power, convenience in operation and the like of microwave heating, the defects of high energy consumption and serious pollution of traditional heating can be obviously improved when the zinc-containing dust is heated.

Description

Technical field [0001] The present invention belongs to the field of iron and steel metallurgy technology, specifically relates to a zinc-containing dust microwave hydrogen reduction dezincification method. Background [0002] The iron and steel industry is an important basic industry for China's economic development, and it is also a large household of solid waste emissions, and a variety of large amounts of difficult dust will be generated in its smelting process, such as zinc-containing dust. According to statistics, the total amount of dust generated by steel companies is generally 8% to 12% of steel production, while zinc-containing dust accounts for 20% to 30%. Based on this calculation, the annual emission of zinc-containing dust from China's steel plants exceeds 20 million tons. Zinc-containing dust is rich in a variety of heavy metals, which is a typical hazardous waste, and if it cannot be effectively disposed of, it will bring serious environmental problems. In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/248C22B5/12
CPCC22B1/242C22B1/248C22B5/12Y02P10/20
Inventor 郭正启朱德庆潘建李启厚杨聪聪李思唯
Owner CENT SOUTH UNIV
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