Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat

A sensible heat recovery and blast furnace slag technology, applied in waste heat treatment, recycling technology, furnace and other directions, can solve the problems of waste of calorific value, waste of water resources, low thermal efficiency, etc., and achieve the effect of high economic value

Inactive Publication Date: 2016-08-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional blast furnace slag is treated with water purification, and the waste heat is recycled in the form of steam to generate electricity. The thermal efficiency is low, resulting in a lot of waste of calorific value and waste of water resources (a blast furnace slag sensible heat recovery and waste heat utilization system, CN 202543226 U)
There are also patents that use the sensible heat of blast furnace slag as the chemical energy for the pyrolysis reaction of printed circuit board substrates to be recycled, which avoids the waste of water resources and avoids the secondary energy consumption problem of pyrolysis treatment of printed circuit board substrates , but this method needs to reduce the slag temperature to about 200°C, which wastes a lot of sensible heat (a method and device for recycling sensible heat of blast furnace slag, CN1020505959A)

Method used

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  • Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat
  • Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] A blast furnace dust removal ash and converter sludge are selected as raw materials. The blast furnace dust removal composition is Fe: 35%, Zn: 10%, Pb: 3%, C: 20%, and the composition of converter sludge is: Fe: 55% , Zn: 1%, H 2 O: 30%. Lime is used as flux. According to the ratio of blast furnace dust: converter sludge: quicklime: cement: water is about 40:45:2:5:8, mix well and press into blocks under a pressure of not less than 20MPa, at a temperature of 20 ~ 30 ℃, humidity ≥ 95% environment for curing for 72 hours, after the curing is completed, send it to the stockyard for stacking. This method can make full use of the carbon in the dust removal dust of the blast furnace, does not need to add additional reducing agent, and can reduce the amount of flux added; at the same time, the water in the converter sludge can be used to reduce the amount of water added.

[0019] The cured briquettes are sent to the top silo of the slag retention chamber, and fed into the ...

Embodiment approach 2

[0021] Choose a kind of electric furnace dust as raw material, its composition is Fe: 35%, Zn: 15%, Pb: 3%; choose coke powder as reducing agent, its fixed carbon content is about 85.5%, ash content is about 12.5%, volatile The content is about 2%; silica powder is used as the flux, and its SiO 2 The content is about 98%; cement is used as the binder. Add coke powder, silica powder, cement and water according to the ratio of electric furnace dust: coke powder: silica powder: cement: water is about 75:10:5:5:5, mix well and under the pressure of not less than 20MPa Pressed into blocks, cured for 72 hours in an environment with a temperature of 20-30°C and a humidity of ≥95%, and sent to the stockyard for storage after the curing is completed.

[0022] The ash agglomerates from electric furnace dedusting are sent to the top silo of the slag retention chamber, and fed into the slag retention chamber through the material bell for reaction. The subsequent smelting process is the ...

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Abstract

The invention belongs to the field of comprehensive utilization of resources and relates to a method for recovering and treating zinc-containing dust through blast furnace slag sensible heat. The zinc-containing dust in a steel plant serves as a main raw material, a certain amount of a reducing agent, a bonding agent, a fluxing agent and water are added, and after sufficient mixing is conducted, a mixture is pressed into balls through a ball press; the balls are sent to a furnace slag retention room after being dried and cured; zinc-containing dust blocks are subjected to a self-reducing reaction through the furnace slag sensible heat; crude-zinc products are recovered through a gas dust removing device; and residual furnace slag is treated through a traditional furnace slag treatment technology. By means of the technology of the method, the zinc-containing dust different in component in the steel plant can be treated, and the zinc element in the dust can also be sufficiently recovered while the C resource in the dust is utilized.

Description

technical field [0001] The invention relates to a process for treating zinc-containing dust, in particular to a process for treating zinc-containing dust by using sensible heat of blast furnace slag to recover zinc resources. Background technique [0002] In the traditional steel production process, a large amount of dust will be produced. This kind of dust is rich in valuable resources such as TFe, CaO, MgO, C, etc., but it also contains zinc, lead and other elements that are unfavorable to the steel production process, so that the dust in the steel Recycling within the process is subject to certain restrictions. As the situation of energy, resources, and environment becomes more and more severe, and the pressure on iron and steel enterprises is also increasing, it is imperative to solve the problem of efficient recycling of zinc and lead dust. [0003] At present, many domestic iron and steel enterprises directly mix zinc-containing dust as raw material into sintering and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B7/02C22B19/30C22B19/20C22B5/16C22B5/10C21B3/06F27D17/00
CPCC21B3/06C22B1/2406C22B1/243C22B5/10C22B5/16C22B7/001C22B7/02C22B19/20C22B19/30F27D17/004Y02P10/20Y02P10/25Y02W30/50
Inventor 张建良刘征建袁骧陈子罗李世钦
Owner UNIV OF SCI & TECH BEIJING
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