Rotary hearth furnace and method for treating lead-zinc smelting slag

A technology for smelting slag and rotary hearth furnace, applied in the field of metallurgy, can solve the problems of increasing processing procedures and costs, unable to deal with zinc-containing lead dust, not proposing an effective treatment method for one-time separation of zinc and lead, etc., so as to reduce equipment investment costs. , the effect of improving economic efficiency

Active Publication Date: 2018-07-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common problems in these pyrotechnics are: 1) the processed products are mostly secondary dust and iron-containing waste slag containing zinc and lead oxides, or low-grade metal zinc, lead and molten iron; 2) its processing mainly For the purpose of recycling the iron in the dust, the by-products of zinc-lead secondary dust are used as raw materials for zinc smelting or lead smelting; 3) The zinc and lead after treatment have not been effectively separated. To use zinc and lead resources, the secondary dust must be treated Reprocessing to separate zinc and lead, which greatly increases processing steps and costs
According to research reports, at present, it is still impossible to deal with zinc-lead dust with low iron content and high lead content at home and abroad, and no effective treatment method for one-time separation of zinc and lead has been proposed.

Method used

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  • Rotary hearth furnace and method for treating lead-zinc smelting slag
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Embodiment 1

[0076] The lead-zinc smelting slag is processed by the rotary hearth furnace for processing lead-zinc smelting slag according to the embodiment of the present invention. The lead-zinc smelting slag is composed of: TFe 35.22wt%, PbO 8.25wt%, ZnO 5.55wt%. After mixing with bentonite in a mass ratio of 100:2, the pellet size is not higher than 5mm. The mixture, in which the lead-zinc smelting slag and the organic binder are uniformly mixed at a mass ratio of 100:5, the final size of the pellets obtained is 10mm, and the pellets are dried and distributed into the rotary hearth furnace, and the temperature in the lead volatilization zone is controlled to be 950℃±20℃, the lead oxide in the pellet is volatilized, and lead oxide dust is collected in the first flue set in the volatilization zone, and the temperature in the zinc-iron reduction zone is controlled to be 1320℃±20℃. On-line monitoring and control is a reducing atmosphere, so that part of zinc oxide in this area is volatiliz...

Embodiment 2

[0078] The lead-zinc smelting slag is processed by the rotary hearth furnace for processing lead-zinc smelting slag according to the embodiment of the present invention, and the lead-zinc smelting slag is composed of: TFe 28.22wt%, PbO 7.25wt%, ZnO 15.55wt%, After mixing with bentonite in a mass ratio of 100:2, the size of the pellet is not higher than 4mm. The mixture, in which the lead-zinc smelting slag and the organic binder are uniformly mixed at a mass ratio of 100:5, the final size of the pellets obtained is 9mm, and the pellets are dried and distributed into the rotary hearth furnace, and the temperature in the lead volatilization zone is controlled to be 950℃±20℃, the lead oxide in the pellet is volatilized, and lead oxide dust is collected in the first flue set in the volatilization zone, and the temperature in the zinc-iron reduction zone is controlled to be 1320℃±20℃, and the temperature in this zone passes On-line monitoring and control is a reducing atmosphere, s...

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Abstract

The invention discloses a rotary hearth furnace and method for treating lead-zinc smelting slag. The rotary hearth furnace comprises a rotatable furnace hearth, an annular combustion chamber, a first partition wall and a second partition wall, wherein a smelting space is defined in the annular combustion chamber, and the smelting space sequentially comprises a feeding region, a lead volatilizing region, a zinc-iron reducing region and a discharging region along the rotating direction of the furnace hearth, wherein a lead outlet is formed in the lead volatilizing region, and a zinc outlet is formed in the zinc-iron reducing region; the first partition wall is arranged between the feeding region and the lead volatilizing region; and the second partition wall is arranged between the lead volatilizing region and the zinc-iron reducing region. By using the rotary hearth furnace, lead, zinc and iron in the lead-zinc smelting slag can be separately separated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular, the invention relates to a rotary hearth furnace and a method for processing lead-zinc smelting slag. Background technique [0002] The smelting slag (dust) containing lead and zinc mainly includes the waste slag from the smelting process of lead and zinc and a metallurgical dust that is inevitable in the production of iron and steel plants. [0003] Lead and zinc are indispensable important metal materials in the process of national economic development, and are widely used in industrial production and human activities. In recent years, lead and zinc smelting enterprises have developed rapidly, and China has become one of the most important lead and zinc producers in the world. [0004] The scale and number of lead and zinc smelting enterprises in my country have been expanding year by year, the output of lead and zinc has increased rapidly, and the smelting technology has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B19/30C22B19/20C22B13/02
CPCC22B7/001C22B7/04Y02P10/20
Inventor 王敏古明远吴佩佩薛逊曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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