Device and method for treating solid waste of iron and steel plant

A solid waste and treatment device technology, applied in crucible furnaces, fluidized bed furnaces, electric furnaces, etc., can solve problems such as high equipment investment, difficulty in handling solid waste, gas pipeline blockage, etc., and achieve high heat transfer density and energy utilization efficiency The effect of high and low furnace equipment requirements

Pending Publication Date: 2022-06-24
BEIJING SHOUGANG INT ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its fine particle size, the dust sludge mixed into the sinter material will greatly affect the air permeability of the sinter material layer and the strength of the sinter ore. Circular enrichment causes the zinc content in the blast furnace gas to rise continuously and nodules form on the upper part of the blast furnace, which leads to the blockage of the gas pipeline and affects the smooth operation of the blast furnace
However, the rotary hearth furnace process for treating Zn-containing dust has the problems of high equipment investment, limited solid waste mixing ratio, difficulty in processing solid waste with large particle size, and still requires agglomeration process, which needs further improvement.

Method used

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  • Device and method for treating solid waste of iron and steel plant
  • Device and method for treating solid waste of iron and steel plant

Examples

Experimental program
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Effect test

Embodiment example 1

[0047] After drying, the solid waste of iron and steel plant has a moisture content of less than 2%, and then undergoes screening treatment. After screening, the material below 6 mm is mixed with coal powder and flux, and then sprayed into the furnace through the solid waste powder spray gun 5, with a thickness of 15-20 mm. The solid waste bulk materials are sent into the solid waste treatment furnace through the bucket elevator and belt conveyor equipment through the solid waste bulk material feeding port 6; the oxygen-rich gas sprayed into the furnace through the oxygen-rich gas spray gun 3 O 2 % content is controlled at 60-75%; oxygen-enriched gas spray guns 3 are arranged on the cone section of the furnace shell, the number is 2, the vertical arrangement angle β on the furnace shell is 25°, and it is a rotary angle in the circumferential direction of the furnace shell distribution, the rotation angle γ is 30°. The substances injected into the furnace through the fuel lanc...

Embodiment example 2

[0049] After the solid waste of the iron and steel plant is preheated and pre-reduced in a high-temperature four-stage fluidized bed, the temperature of the raw material entering the furnace reaches 800 °C, and the pre-reduction degree of the raw iron element is 75%. After the flux is mixed, the solid waste powder material spray gun 5 is sprayed into the furnace through the high-temperature airtight nitrogen conveying pipe; the oxygen-rich gas injected into the furnace through the oxygen-rich gas spray gun 3 2 % content is controlled at 60-75%; oxygen-enriched gas spray guns 3 are arranged on the cone section of the furnace shell, the number is 2, the vertical arrangement angle β on the furnace shell is 30°, and it is a rotary angle in the circumferential direction of the furnace shell distribution, the rotation angle γ is 30°. The substances injected into the furnace through the fuel lance 4 can be fuels such as high calorific value gas, natural gas, biomass gas, oil, etc. Th...

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Abstract

The invention discloses a steel plant solid waste treatment device and method, and belongs to the technical field of smelting. The invention mainly solves the problem of utilization of metallurgical dust, sludge and waste residue with high content of harmful elements generated in sintering, ironmaking, steelmaking and steel rolling procedures in a steel plant. The device mainly comprises a solid waste treatment furnace, a high-temperature water cooling facility, an oxygen-enriched gas spray gun, a fuel spray gun, a solid waste powder spray gun, a solid waste bulk material feed opening, a slag outlet, a front iron outlet, a heavy metal discharge opening, a liquid metal area, a slag-iron mixing area and a combustion area. The method has the main advantages that the method has the characteristics of being wide in raw material applicability and simple and efficient in treatment, valuable elements such as zinc and lead in the waste materials are recycled, meanwhile, high carbon content in metallurgical dust is effectively utilized, and pure liquid metal iron can be obtained.

Description

technical field [0001] The invention belongs to the technical field of smelting, in particular to a method and a device for processing solid wastes in iron and steel plants, and is especially suitable for the processing of solid wastes containing zinc and lead. Background technique [0002] In each process of iron and steel production, a large amount of dust and sludge are produced. The main varieties are: blast furnace gas dry dust, gravity dust, converter sludge, electric furnace dust, secondary dust, etc. The total amount of iron-containing dust captured in the post environmental dust removal of the process should account for 4 to 7% of the steel output of the enterprise. [0003] With the continuous development of my country's iron and steel industry, the proportion of scrap steel recycling has become larger and larger, which is not only the need of circular economy, but also the inevitable result of sustainable development. In the scrap steel, Zn-containing scrap steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B7/04C22B7/00C22B19/30C22B19/34C22B19/04C22B13/02C22B43/00C22B15/00C21B13/00C22B5/12
CPCC22B7/02C22B7/04C22B7/001C22B19/30C22B19/34C22B13/025C22B19/04C22B43/00C22B15/0052C21B13/0006C21B13/0073C22B5/12
Inventor 孟玉杰李龙蛟曹朝真闫方兴章启夫胡伟李乃尧
Owner BEIJING SHOUGANG INT ENG TECH
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