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Method for extracting iron particles and zinc powder from dust of steel and iron plant

A technology for iron and steel plants and dust, applied in the direction of improving process efficiency, can solve problems such as failure to explore a good process control method, processing capacity, unsatisfactory reduction rate, and backward technology, so as to improve the comprehensive utilization level of resources and optimize components. The effect of controlling and streamlining the process route

Active Publication Date: 2012-01-25
中国冶金科工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods for treating dust in iron and steel plants are either outdated in technology, high in energy consumption, uneconomical, or feasible in technology, but have not found a good process control method, and the processing capacity and reduction rate are not ideal, so further exploration is needed

Method used

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  • Method for extracting iron particles and zinc powder from dust of steel and iron plant
  • Method for extracting iron particles and zinc powder from dust of steel and iron plant

Examples

Experimental program
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Effect test

Embodiment 1

[0020] As shown in Figure 1, a kind of method extracting iron particle and zinc powder from iron and steel factory dust, it comprises the steps:

[0021] 1) According to the mass ratio of iron and steel plant dust, dolomite and adhesive as 1:0.08:0.04, select iron and steel plant dust, dolomite and adhesive, mix them on the mixer, and then send them to the ball press machine to form 7~ 13mm green balls, the made green balls are then dried in a dryer to reduce the moisture content of the green balls to below 2wt% to obtain dried green balls;

[0022] The iron and steel plant dust is all kinds of iron-containing dust produced in the production process of the iron and steel plant; after the iron-containing dust is prepared, the iron content is 50wt%, and the zinc is 2wt%;

[0023] Described bonding agent is diatomaceous earth;

[0024] 2) Send the dried raw pellets to the buffer bin of the rotary hearth furnace, and evenly distribute them into the rotary hearth furnace through t...

Embodiment 2

[0029] Basically the same as Example 1, the difference is: the mass ratio of iron and steel plant dust, dolomite, and bonding agent is 1: 0.05: 0.03;

[0030] The iron and steel plant dust is all kinds of iron-containing dust produced in the iron and steel plant production process (such as steelmaking); after the iron-containing dust is prepared, the iron content is 45wt%, and the zinc is 2wt%;

[0031] The binder is molasses.

Embodiment 3

[0033] Substantially the same as Example 1, the difference is that the mass ratio of iron and steel plant dust, dolomite, and binding agent is 1: 0.1: 0.06,

[0034] The iron and steel plant dust is all kinds of iron-containing dust produced in the iron and steel plant production process (such as hot rolling); after the iron-containing dust is prepared, the iron content is 50wt%, and the zinc content is 4wt%.

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Abstract

The invention relates to a method for extracting iron particles and zinc powder from dust of a steel and iron plant. The method for extracting the iron particles and the zinc powder from the dust of the steel and iron plant is characterized by comprising the following steps of: 1) pressing the dust of the steel and iron plant, dolomite and adhesive in a mass ratio of 1: (0.05-0.1): (0.03-0.06) bya ball press to form raw balls; 2) conveying the dried raw balls to a rotary hearth furnace, and performing high-temperature reduction; and 3) discharging the reduced cured balls out of the furnace through a spiral discharger arranged in the rotary hearth furnace, cooling, and screening to obtain the iron particles; preferentially reducing zinc in the raw balls into zinc steam in the rotary hearth furnace under the actions of reductive atmosphere and high temperature, and discharging the zinc steam from the rotary hearth furnace together with the flue gas generated in the rotary hearth furnace to form zinc-containing flue gas; introducing the zinc-containing flue gas to a bag-type dust collector, and catching and reclaiming the zinc oxide dust in the zinc-containing flue gas to obtain thezinc powder; and discharging the residual waste gas to the atmosphere through a chimney under the action of a draught fan. The method reduces the production energy consumption and the cost, and can realize comprehensive utilization of resources.

Description

technical field [0001] The invention relates to a method for extracting iron particles and zinc powder from iron and steel plant dust. Background technique [0002] With the increasing awareness of the importance of environmental protection and comprehensive utilization of resources, the national energy-saving and emission-reduction requirements are increasingly urgent, and the research and recycling of iron and steel plant dust (the dust contains iron and zinc) has become a major issue in the metallurgical industry. focus. [0003] The production process of iron and steel plants includes ironmaking, steelmaking, hot rolling, cold rolling and public auxiliary facilities, etc. Every year, each process produces a large amount of blast furnace dust, converter dust, iron oxide scale, waste, etc. If they are not recycled, not only It pollutes the environment, and increases the cost of foreign transportation, which aggravates the production cost of enterprises. If the recycling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C21B11/00C22B1/242
CPCY02P10/20
Inventor 唐恩秦涔王小伟周强喻道明夏锋
Owner 中国冶金科工股份有限公司
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