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Recycling treatment method for zinc-containing ironmaking and steelmaking intermediate slag

A technology of iron and steel smelting and processing methods, applied in the field of resource processing, which can solve the problems of low equipment production capacity, high processing cost, and low compressive strength of pellets, and achieve the effect of reduced product energy consumption and high product energy cost

Inactive Publication Date: 2012-08-15
陈小林 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the compressive strength should also be increased as much as possible, otherwise the metallized pellets after dezincification cannot meet the requirements of blast furnace smelting
[0014] At present, the defect of the rotary hearth furnace process is that: the compressive strength of the pellets processed by the rotary hearth furnace is generally low, and this process is only limited to the dust sludge with low zinc content and high total iron content; more critically, The thickness of the material layer of the rotary hearth furnace is only 30-50mm, so the equipment capacity per unit roasting area of ​​the rotary hearth furnace is low, the large-scale process is limited, the investment is large, and the processing cost is high
At present, there is no relevant public literature or report or application

Method used

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  • Recycling treatment method for zinc-containing ironmaking and steelmaking intermediate slag
  • Recycling treatment method for zinc-containing ironmaking and steelmaking intermediate slag
  • Recycling treatment method for zinc-containing ironmaking and steelmaking intermediate slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Follow these steps:

[0070] 1. Use the following raw materials by weight: 40-60% of gravity dust removal, 40-60% of converter sludge, 10%-40% of electric furnace dust, after mixing, dry and ball mill to about 120-160 mesh, and measure the dry material by screw The scale and atomized water microcomputer control system enter the pre-adding water into the ball forming twin-shaft mixer, and the pre-wet material enters the disc ball forming machine to form 12-16mm carbon-containing pellets.

[0071] 2. Adopt the following raw materials in parts by weight: 40-80% of bituminous coal, 10-50% of coal gangue, and 0-10% of lime, mix and grind to 160-200 mesh through ball milling, and then make 160-200 mesh fine powder to obtain packaged Shell powder, the mass percentage of fixed carbon content in the cladding powder is 20-60%, and the mass percentage of volatile component content is 20-40%.

[0072] 3. Put the carbon-containing pellets and shell powder into the second disc formi...

Embodiment 2

[0083] Follow these steps:

[0084] 1. Use the following raw materials by weight: 40-60% of gravity dust removal, 40-60% of converter sludge, 10%-40% of electric furnace dust, after mixing, dry and ball mill to about 120-160 mesh, and measure the dry material by screw The scale and atomized water microcomputer control system enter the pre-adding water into the ball forming twin-shaft mixer, and the pre-wet material enters the disc ball forming machine to form 12-16mm carbon-containing pellets.

[0085] 2. Adopt the following raw materials in parts by weight: 40-80% of bituminous coal, 10-50% of coal gangue, and 0-10% of lime, mix and grind to 160-200 mesh through ball milling, and then make 160-200 mesh fine powder to obtain packaged Shell powder, the mass percentage of fixed carbon content in the cladding powder is 20-60%, and the mass percentage of volatile component content is 20-40%.

[0086] 3. Put the carbon-containing pellets and shell powder into the second disc formi...

Embodiment 3

[0097] Follow these steps:

[0098] 1. Use the following raw materials by weight: 40-60% of gravity dust removal, 40-60% of converter sludge, 10%-40% of electric furnace dust, after mixing, dry and ball mill to about 120-160 mesh, and measure the dry material by screw The scale and atomized water microcomputer control system enter the pre-adding water into the ball forming twin-shaft mixer, and the pre-wet material enters the disc ball forming machine to form 12-16mm carbon-containing pellets.

[0099] 2. Adopt the following raw materials in parts by weight: 40-80% of bituminous coal, 10-50% of coal gangue, and 0-10% of lime, mix and grind to 160-200 mesh through ball milling, and then make 160-200 mesh fine powder to obtain packaged Shell powder, the mass percentage of fixed carbon content in the cladding powder is 20-60%, and the mass percentage of volatile component content is 20-40%.

[0100] 3. Put the carbon-containing pellets and shell powder into the second disc formi...

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Abstract

The invention discloses a recycling treatment method for zinc-containing ironmaking and steelmaking intermediate slag, comprising the following steps of: preparing zinc-containing ironmaking and steelmaking intermediate slag into carbon-containing pellets; mixing one or more than one of soft coal, brown coal, lime powder, coal slime, coal gangue and saw powder, to prepare into cladding powder; adding an adhesive into the carbon-containing pellets and the cladding powder to prepare into composite carbon-containing pellets with the thickness of the cladding powder being 0.5-3.0mm; drying the composite carbon-containing pellets, charging into a chain belt type roasting machine to carry out reductive roasting under a high temperature; carrying out oxidation reaction on zinc steam in the chain belt type roasting machine, and finally preparing into ZnO powder; and carrying out water quenching on the dried composite carbon-containing pellets, decladding, magnetically separating, and classifying, so that semi-metalized pellets can be obtained. According to the method, the zinc-containing ironmaking and steelmaking intermediate slag which can not be directly used in the conventional blast furnace smelting technology is machined into an ironmaking high-quality raw material, i.e. the semi-metalized pellets, and the zinc in waste material can be comprehensively recovered to be prepared into the ZnO powder of the chemical additive, therefore, the waste can be changed into valuable.

Description

technical field [0001] The invention relates to a treatment method for zinc-containing iron and steel smelting intermediate slag, in particular to a resource treatment method for rationally utilizing zinc-containing iron and steel smelting intermediate slag into useful resources. Background technique [0002] Iron and steel smelting intermediate waste in iron and steel enterprises mainly refers to blast furnace dust, electric furnace dust, converter sludge, etc., and the production amount is generally 8-12% of steel output. The U.S. Environmental Protection Agency has conducted a toxic leaching test (TCLP) on electric arc furnace dust. Lead, zinc, arsenic, cadmium and chromium cannot pass the environmental protection law standards, so the dust is classified as hazardous waste. Since 1988, the dust has been prohibited from being disposed of in traditional landfills, and must be treated as harmless waste before landfilling. [0003] In addition to iron, these dusts also conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C22B1/24C22B1/02C01G9/02
CPCY02W30/50
Inventor 朱勇陈小林肖伦
Owner 陈小林
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