Method for recovering zinc oxide in Zn-containing dust treatment by rotary hearth furnace

A technology of dust recovery and rotary hearth furnace, which is applied in the field of zinc-containing dust treatment and zinc oxide recovery from zinc-containing dust by rotary hearth furnace, which can solve the problem of low zinc recovery rate

Active Publication Date: 2009-03-18
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0004] The shortcoming of above-mentioned prior art is: the rate of recovery of zinc in zinc-containing dust is low

Method used

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  • Method for recovering zinc oxide in Zn-containing dust treatment by rotary hearth furnace

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Embodiment Construction

[0015] The method for reclaiming zinc oxide from zinc-containing dust in the regenerative rotary hearth furnace of the present invention, its preferred specific implementation is as shown in Figure 1, comprising the steps:

[0016] Firstly, raw material preparation is carried out, and the raw materials such as coal, iron and steel plant dust sludge (zinc-containing dust), additives are proportioned according to the following parts by weight:

[0017] Coal: 20-30 parts;

[0018] Zinc-containing dust: 70-80 parts;

[0019] Additives: 2 to 5 parts.

[0020] Among the above raw materials,

[0021] Coal: Non-coking coal can be used, the ash content of pulverized coal is ≤10%, the particle size is ≤0.1mm, and coke oven coal can also be used;

[0022] Zinc-containing dust: blast furnace, converter or electric furnace dust can be used, or a mixture of various dusts, with a particle size of ≤0.1mm and a moisture content of ≤6%;

[0023] Additives: including solvents and organic adh...

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Abstract

The invention discloses a method for reclaiming zinc oxide in treating zincky powder dust in a rotary hearth furnace. The zincky powder dust, coal and flux are mixed, then are subjected to briquetting and drying, are transported to the rotary hearth furnace and are subjected to direct reduction; zinc in the powder dust is reclaimed from exhaust gas; and a feed block of which zinc is removed is directly reduced through the rotary hearth furnace and is subjected to cooling or briquetting for use. The method has wide applicability to zincky materials, can farthest utilize resource reasonably, has low requirement on the thermal value of fuels, high temperature of flue gas and high zinc extraction rate; and the treated powder dust is changed into direct reduced iron for comprehensive utilization.

Description

technical field [0001] The invention relates to a technology for treating zinc-containing dust in the field of iron and steel metallurgy, in particular to a method for treating zinc-containing dust in a rotary hearth furnace and recovering zinc oxide. Background technique [0002] Dust from iron and steel plants contains harmful elements such as zinc. If these dusts are simply dumped into the field or landfilled, the leaching of these metal elements will pollute the environment, and the dust will be returned directly to the steel plant for recycling. The rich zinc in the blast furnace The assembly shortens the life of the furnace lining and affects the normal operation of the blast furnace. [0003] In the prior art, the recovery and treatment processes for zinc in dust include wet method, pyrotechnic method and wet method combined with pyrotechnic method, such as rotary kiln treatment process and Inmetco annular furnace treatment process. Valuable elements such as iron, zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/34F27D17/00
CPCY02P10/20Y02P10/25
Inventor 吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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