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Method for preparing metal lead powder through vacuum carbothermal reduction

A metal lead and carbon heat technology, applied in the direction of improving process efficiency, can solve the problems of consumption and processing costs, achieve stable and reliable quality, shorten the process flow, and improve the utilization level of waste resources

Inactive Publication Date: 2016-06-01
HONGHE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the metal lead powder used in these industries is mainly processed into metal lead powder after the lead ingot is melted again, which consumes the processing cost repeatedly.

Method used

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  • Method for preparing metal lead powder through vacuum carbothermal reduction
  • Method for preparing metal lead powder through vacuum carbothermal reduction
  • Method for preparing metal lead powder through vacuum carbothermal reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) According to the mass ratio of 5:1, take 100g of zinc smelting leaching slag, the main component is lead sulfate, containing 50.73% lead, the reducing agent is 20g of activated carbon, and the leaching slag is crushed and mixed evenly with activated carbon to obtain a mixture.

[0024] (2) Compress the mixture into a cylindrical block on a tablet press.

[0025] (3) Put the block material into the high temperature resistant crucible, open the top of the crucible, then put it into the vacuum furnace, and set the furnace cover with a condensation plate above the crucible in the furnace. After covering the furnace cover, start the vacuum furnace, heat up to 500°C at a heating rate of 5°C / min, hold for 8 hours, and control the pressure in the vacuum furnace at 1-5Pa.

[0026] (4) After the reduction reaction is completed, cool down, start the furnace and take the material, and obtain the product metal lead powder on the condensing plate, the purity is 99.98%, and the co...

Embodiment 2

[0030] (1) According to the mass ratio of 20:1, take 100g of zinc smelting leaching slag, the main component is lead sulfate, containing 55.36% lead, and 5g of reducing agent charcoal. After crushing the leaching slag, mix it with charcoal powder evenly.

[0031] (2) Compress the mixture into a cylindrical block on a tablet press.

[0032] (3) Put the block material into the high temperature resistant crucible, open the top of the crucible, then put it into the vacuum furnace, and set the furnace cover with a condensation plate above the crucible in the furnace. After covering the furnace cover, start the vacuum furnace, heat up to 650°C at a heating rate of 10°C / min, hold for 5 hours, and control the pressure in the vacuum furnace at 5-10Pa.

[0033] (4) After the reduction reaction is finished, cool down, start the furnace to take the material, and obtain the product metal lead powder on the condensing plate, the purity is 99.991%. 0.22%, bismuth 3.51%, copper 4.23%, antimo...

Embodiment 3

[0037] (1) According to the mass ratio of 10:1, take 100g of zinc smelting leaching slag, the main component is lead sulfate, containing 64.83% lead, and the reducing agent is 10g of coal, and the two are crushed and mixed evenly to obtain a mixture.

[0038] (2) Compress the mixture into a cylindrical block on a tablet press.

[0039] (3) Put the block material into the high temperature resistant crucible, open the top of the crucible, then put it into the vacuum furnace, and set the furnace cover with a condensation plate above the crucible in the furnace. After covering the furnace cover, start the vacuum furnace, heat up to 1000°C at a heating rate of 20°C / min, hold for 1 hour, and control the pressure in the vacuum furnace at 60-100Pa.

[0040] (4) After the reduction reaction is completed, cool down, start the furnace and take the material, and obtain the product metal lead powder on the condensing plate, the purity is 99.995%, and the composition is shown in Table 3; th...

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Abstract

The method relates to a method for preparing metal lead powder through vacuum carbothermal reduction. The method comprises the following steps: blending zinc smelting leaching residue with a reducing agent in a mass ratio of (5-20): 1, and breaking and evenly mixing the materials to obtain a mixture; pressing the mixture on a tablet press into lump materials; loading the lump materials into a high temperature-resistant crucible of which a upper opening is open, and then placing the crucible into a vacuum furnace; arranging a furnace cover with a condensation disc above the crucible in the furnace, starting the vacuum furnace after the furnace cover is closed, heating to the range of 500-1000 DEG C at a temperature rise rate of 5-20 DEG C per minute, preserving heat for 1-8 hours, and controlling the pressure in the vacuum furnace to be less than or equal to 100Pa; and after the reduction reaction is finished, carrying out cooling, and opening the furnace to take out materials, thereby obtaining the product metal lead powder on the condensation disc, and obtaining reducing slag in the high temperature-resistant crucible. The method for preparing the metal lead powder through the vacuum carbothermal reduction is capable of obtaining the metal lead powder through one-step vacuum reduction smelting; the method has the advantages of short process flow, relatively low reaction temperature, easy heating, convenient operation and control, no production of lead oxide smoke dust, no environmental pollution, stable and reliable lead powder quality, satisfaction of quality standard, high lead recovery, low cost, and high comprehensive utilization level of resources.

Description

technical field [0001] The invention relates to a method for preparing metallic lead powder by vacuum carbothermal reduction, which belongs to the technical field of comprehensive recovery of leaching slag from zinc smelting. Background technique [0002] At present, the leaching slag produced by the zinc smelter mainly contains lead sulfate. The industrial production method of this slag is: the lead smelting system of the fire method, adding a large amount of pyrite or iron oxide, quartz stone, limestone, coal, etc. After the slagging agent, flux and reducing agent are blown into compressed air or oxygen-enriched conditions, two-stage smelting of oxidation and reduction is carried out to produce crude lead, lead oxide smoke and a large amount of slag (discarded slag). Lead ingot products are obtained after crude lead is refined. [0003] Using this traditional method to treat the leaching slag produced by zinc smelters has the following problems: 1. It is necessary to add ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/12C22B13/02C22B7/00
CPCB22F9/12C22B13/025Y02P10/20
Inventor 孙红燕森维刘卫肖锐敏孔馨刘贵阳易中周
Owner HONGHE COLLEGE
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