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Lead-zinc integrated smelting furnace and method thereof for recovering lead and zinc

A smelting furnace, lead-zinc technology, applied in the field of integrated lead-zinc integrated smelting furnace that directly recovers lead and zinc, can solve the problems of discontinuous process, large investment, lead vapor leakage pollution, etc., to improve safety and avoid environmental pollution Pollution and the effect of reducing construction investment

Inactive Publication Date: 2010-09-22
CHINA NERIN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantage of zinc recovery in a separate fuming furnace is that the process is long, energy consumption is high, and investment is large, especially because the entire process is carried out between different equipments, which leads to process discontinuity and easily leads to SO 2 and lead vapor leakage pollution and safety accidents caused by high temperature melt transfer

Method used

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  • Lead-zinc integrated smelting furnace and method thereof for recovering lead and zinc
  • Lead-zinc integrated smelting furnace and method thereof for recovering lead and zinc
  • Lead-zinc integrated smelting furnace and method thereof for recovering lead and zinc

Examples

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no. 1 example

[0034] figure 1 A schematic diagram of an integrated lead-zinc smelting furnace 100 according to an embodiment of the present invention is shown. Such as figure 1 As shown in , according to an embodiment of the present invention, the lead-zinc integrated smelting furnace 100 includes: a reaction tower 1; The melt that falls after the reaction in the middle is divided into a slag layer 21 and a lead layer 22 in the sedimentation tank 2; a reduction tank 3, the reduction tank 3 is set adjacent to the sedimentation tank 2 and separated by a separator 4 , the reduction tank 3 is in fluid communication with the bottom of the sedimentation tank 2; a reductant supply unit 5 corresponding to the reduction tank 3, the reductant supply unit 5 is arranged on the furnace body of the reduction tank 3, to When the temperature of the reduction tank 3 is maintained within a predetermined temperature range, a reducing agent is supplied into the reduction tank 3 in such an amount that the lea...

no. 2 example

[0045] figure 2 A schematic diagram of an integrated lead-zinc smelting furnace 200 according to another embodiment of the present invention is shown. The lead-zinc integrated smelting furnace 200 includes: a reaction tower 1; a sedimentation tank 2, the sedimentation tank 2 is integrally arranged at the lower part of the reaction tower 1, and accommodates the melt falling from the reaction tower 1 after reaction, the melt Be divided into slag layer 21 and lead layer 22 in sedimentation tank 2; Reduction tank 31,32, described reduction tank 31,32 is arranged adjacent to sedimentation tank 2 and separated by separator 41,42, and described reduction tank 31 , 32 are in fluid communication with the bottom of the sedimentation tank 2; the reductant supply units 401, 402 corresponding to the reduction tanks 31, 32, the reductant supply units 401, 402 are respectively arranged in the reduction tanks 31, 32 On the furnace body, when the temperature of the reduction pools 31, 32 is ...

example

[0065] The following is an example of an experimental lead-zinc integrated smelting furnace (with an annual output of 30,000 tons / year of crude lead) in a factory in Yunnan, China, to describe the above-mentioned technology for directly recovering lead and zinc from the slag of the integrated lead-zinc smelting furnace. The composition of the lead concentrate used in the integrated smelting furnace is as follows:

[0066] Pb 50%, S 18%, Zn 3%, Cu 0.5%, Fe 15%, Ag 3000g / t.

[0067] The specific process steps are as follows:

[0068] (1) The powdery lead sulfide concentrate with 8% water content before drying and 0.3% water content after drying is sprayed into high-temperature reaction through a nozzle (not shown) together with oxygen containing 90% oxygen in the air supply and 25° C. of air supply temperature In tower 1, the inner diameter of the vortex furnace reaction tower is 3.0m and the height is 6.5m. The input of oxygen is controlled so that the oxidation rate of lead ...

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Abstract

The invention discloses a lead-zinc integrated smelting furnace. The smelting furance comprises a reaction tower, a settling pond, at least one reducing pond, at least one reducing agent feed unit corresponding to the reducing pond and a flue, wherein the settling pond is integrally arranged on the lower part of the reaction tower; the reducing pond and the settling pond are adjacently arranged and are separated by a separator, and liquid in the reducing pond is communicated with liquid on the bottom of the settling pond; the supply quantity of reducing agent causes lead and zinc in a slag blanket in the reducing pond to be reduced by the reducing agent into metal lead and zinc; the reduced lead enters a lead layer; the reduced zinc is volatilized into a flue and is mixed with flue gas in the flue to obtain flue gas containing the zinc; the flue is used for discharging the flue gas generated in the reaction tower, and the reduced zinc is volatilized in the reducing pond and is discharged through the flue. The invention further discloses a method for recovering lead and zinc by utilizing the lead-zinc integrated smelting furnace. The lead-zinc integrated smelting furnace and the method of the invention can shorten lead smelting process, realize continuous production and lower production cost.

Description

technical field [0001] The invention relates to the field of non-ferrous metal metallurgy, in particular to an integrated lead-zinc integrated smelting furnace for directly recovering lead and zinc and a method thereof. Background technique [0002] In the process of lead smelting, because the slag contains lead oxide and zinc oxide, it will not only cause environmental pollution, but also cause waste of precious metals, so it is necessary to recycle them. [0003] In existing recycling methods, the molten slag is usually first cooled into ingots. The ingot is then subjected to reduction smelting in a coke-fueled blast furnace for lead recovery first. Then, send the deleaded low-lead slag to the pulverized coal injection fuming furnace for further reduction smelting, so as to recover the zinc therein. [0004] At present, the main lead smelting methods and devices in the world include Australia's ISA / AUSMELT, Germany's oxygen bottom blowing (QSL) method, Russia's "Kivcet m...

Claims

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Application Information

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IPC IPC(8): C22B13/02C22B19/00
Inventor 张文海王吉坤董英章晓波
Owner CHINA NERIN ENG
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