Method for processing dust containing zinc and lead in steel plant through closed cupola furnace

A process method, the technology of cupola, applied in the field of lead dust process, zinc-containing, using closed cupola to treat zinc-containing, lead dust treatment process, can solve the problem of low energy utilization efficiency, affecting operating costs, short equipment operating cycle, etc. problems, to achieve significant economic and environmental benefits, high processing efficiency and product added value, and strong adaptability of raw materials

Active Publication Date: 2013-12-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rotary hearth furnace process removes harmful elements such as lead and zinc from the dust through mixing-batching-forming-rotary hearth furnace direct reduction and other processes to obtain direct reduced iron, which can be returned to the steel production process for use. The advantage of this process lies in the treatment It has high efficiency, moderate processing capacity, and low energy requirements. It can directly use the by-product gas of the iron and steel plant as the heat source, and can well recover iron, zinc, lead and other metals in the dust, but the rotary hearth furnace process also has s

Method used

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  • Method for processing dust containing zinc and lead in steel plant through closed cupola furnace

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Experimental program
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Effect test

Embodiment approach 1

[0019] A kind of electric furnace dust is selected as the raw material, and its composition is Fe: 35%, Zn: 13%, Pb: 3.5%; coke powder is used as the reducing agent, the fixed carbon content is about 85.5%, the ash content is about 12.5%, and the volatilization 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. Put the electric furnace dedusting ash into the dryer for drying, add coke powder, silica powder, cement and water according to the ratio of electric furnace dedusting ash: coke powder: silica powder: cement: water about 100:17:5:10:15, fully After mixing, press it into blocks under a pressure of not less than 20MPa, and cure it for 72 hours in an environment with a temperature of 20-30°C and a humidity of ≥95%, and send it to the stockyard for stacking after curing.

[0020] The electric furnace dedusting ash pellets and coke are sent to the preheater respectively for preheating, the pellet...

Embodiment approach 2

[0022] A blast furnace dust removal ash and an electric furnace dust removal dust are selected as raw materials. The composition of the blast furnace dust removal dust is Fe: 31%, Zn: 9%, Pb: 0.5%, and C: 21%. The composition of the electric furnace dust removal dust is consistent with that of Embodiment 1 . Lime is used as flux. Add blast furnace dust and electric furnace dust to the dryer for drying, and mix according to the ratio of blast furnace dust: electric furnace dust: quicklime: cement: water about 65:35:2:10:15, mix well Pressed into blocks under a pressure lower than 20MPa, 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 stacking after the curing is completed. 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.

[0023] The pellets and coke are resp...

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Abstract

The invention discloses a method for processing the dust containing zinc and lead in a steel plant through a closed cupola furnace, and belongs to the field of steel production. The method is characterized in that the dust containing the zinc and the lead in the steel plant serves as the main raw material, certain quantities of a reducing agent, a binder, a fusing agent and water are added, and after fully mixing, the mixed materials are pressed by a ball pressing machine into balls; after being dried or maintained, the balls are conveyed into the closed cupola furnace to be smelted, and finally spelter, lead bullion and molten iron are obtained. The method has the advantages of being high in raw material adaptability, strong in production capability, high in processing efficiency and additional value of products and the like. The spelter, the lead bullion, the molten iron, gas, slag and the like can be directly obtained through the dust containing the zinc and the lead in the steel plant, the spelter and the lead bullion can be refined further, and the additional value of the products is improved. The molten iron is preprocessed and then is cast into ingots to be sold. After being processed, the slag can serve as building materials or cement or other production raw materials. The gas can serve as gas fuel to be used in the plant. The method is very obvious in economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of iron and steel production, and relates to a process for treating dust containing zinc and lead, in particular to a process method for treating dust containing zinc and lead in a closed cupola. 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 and lead dust as raw m...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B13/02C22B19/30C21B11/00
CPCY02P10/20
Inventor 张建良毛瑞刘征建黄冬华袁骧王飞邢相栋张亚鹏
Owner UNIV OF SCI & TECH BEIJING
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