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Method for directly preparing metallic lead by utilizing galena

A technology for galena and metallic lead is applied in the field of directly preparing metallic lead by using galena, which can solve the problems of high energy consumption, environmental pollution and the like, and achieve the effects of low energy consumption, high efficiency and simple process

Inactive Publication Date: 2020-04-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, provide a method for directly preparing metallic lead from galena, and solve the problems of high energy consumption and serious environmental pollution

Method used

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  • Method for directly preparing metallic lead by utilizing galena
  • Method for directly preparing metallic lead by utilizing galena

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 Shown, this galena prepares the method for metallic lead, and its specific steps are as follows: first utilize ball mill ball milling 50g galena raw material (containing PbS 98.12wt%) and press into cylindrical block (diameter is 20mm, height is 30mm) , under the condition that the residual pressure of the system in the vacuum furnace is 10Pa, the cylindrical briquette is raised to 1100°C at a rate of 8°C / min, and the distillation is kept for 45 minutes. After the heat preservation is completed, stop heating and let the vacuum furnace cool naturally. The temperature is lowered below 50°C to obtain high-purity metallic lead residues containing 99.99% by weight of metallic lead and undecomposed galena volatiles, and the volatiles are continued to be ball-milled with raw materials to form blocks to continue vacuum distillation, and the above-mentioned distillation process is repeated .

Embodiment 2

[0034] Such as figure 1 Shown, this galena prepares the method for metallic lead, and its specific steps are as follows: first 50g galena raw material (containing PbS 97.96wt%) utilizes the ball mill to be pressed into cylindrical block (diameter is 20mm, and height is 30mm) , under the condition that the residual pressure of the system in the vacuum furnace is 50Pa, the cylindrical briquette is raised to 1200°C at a rate of 5°C / min, and the distillation is kept for 40 minutes. After the heat preservation is completed, stop heating and let the vacuum furnace cool naturally. The temperature is lowered below 50°C to obtain high-purity metallic lead residues containing 99.99% by weight of metallic lead and undecomposed galena volatiles, and the volatiles are continued to be ball-milled with raw materials to form blocks to continue vacuum distillation, and the above-mentioned distillation process is repeated .

Embodiment 3

[0036] Such as figure 1 As shown, the method for preparing metallic lead from this galena, its specific steps are as follows: first, 50g of galena raw material (containing PbS 97.12wt%) is pressed into a cylindrical block (with a diameter of 20mm and a height of 30mm) after being ball milled by a ball mill , under the condition that the residual pressure of the system in the vacuum furnace is 100Pa, the cylindrical briquette is raised to 1400°C at a rate of 10°C / min, and the distillation is kept for 50 minutes. The temperature is lowered below 50°C to obtain high-purity metallic lead residues containing 99.99% by weight of metallic lead and undecomposed galena volatiles, and the volatiles are continued to be ball-milled with raw materials to form blocks to continue vacuum distillation, and the above-mentioned distillation process is repeated .

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Abstract

The invention discloses a method for directly preparing metallic lead by utilizing galena. The method comprises the following steps of S1, ball-milling a galena raw material and then pressing into a block; S2, heating the block raw material to 950-1400 DEG C under the condition that the residual pressure of a system in a vacuum furnace is 1-100Pa, carrying out vacuum distillation, and then coolingto obtain high-purity metallic lead residues. The method disclosed by the invention has the following beneficial effects that (1) the raw material is saved, high-value utilization of the raw materialis realized, and zero waste is realized; (2) the efficiency is high, the energy consumption is low, and the metallic lead with high purity can be obtained by vacuum distillation once; and (3) the process is simple, other chemical reagents do not need to be added, and no pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, in particular to a method for directly preparing metallic lead from galena. Background technique [0002] Galena (PbS) is the most widely distributed lead-containing sulfide ore in nature. The chemical composition is 86.60% Pb, 13.4% S. This mineral often exists with silver, copper, zinc, iron and other sulfides. It is obtained after beneficiation The galena in the country enters the traditional "sintering machine sintering-blast furnace reduction smelting" process, and there are also direct smelting technologies, such as the QSL method, the set Fussett method, the Osmetter method, the Kaldor furnace method and China's Shuikou Shan SKS et al. Their common feature is that they directly smelt lead concentrate, and use the large amount of heat released by the oxidation of lead sulfide to rapidly melt the charge to produce liquid lead and slag. There are problems such as high en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02C22B9/02
CPCC22B9/02C22B13/02Y02P10/20
Inventor 郭学益董朝望夏阳赵金龙
Owner CENT SOUTH UNIV
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