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Method for separating high-purity lead from lead-bismuth alloy

A lead-bismuth alloy and high-purity technology is applied in the field of non-ferrous metal smelting, separation and purification, and can solve the problems of high energy consumption, increased cost of separating lead-bismuth alloy, and large pollution, and achieves low energy consumption, clean production, and good product quality. Effect

Inactive Publication Date: 2018-10-30
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this process is relatively simple, and the refined lead grade of the output is higher than 99.5%, which is suitable for large-scale production, but it is a pyrotechnic production process, which causes large pollution and high energy consumption, and when the bismuth content in the lead-bismuth alloy is lower than 12 %, the cost of separating lead-bismuth alloy increases exponentially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Melting preparation: heat and melt lead, bismuth, and tin alloys with mass fractions of 45%, 54%, and 1% of lead, bismuth, and tin in a 99.9% argon protective atmosphere furnace at a temperature of 350°C for 20 minutes , and then inject the molten alloy melt into a high-purity graphite crucible, and cool it at a cooling rate of 5 °C / s.

[0019] (2) Electromagnetic directional separation: fix the high-purity graphite crucible containing the lead-bismuth alloy melt in step (1) on the liftable stage in the heating area of ​​the electromagnetic induction power frequency furnace, and add a heat insulation shell to the outside of the stage , and the heat insulation shell is filled with asbestos for heat preservation. Turn on the cooling circulating water pump, turn on the power, turn on the heating, heat the crucible to 350°C at a heating rate of 1-15°C / min, and keep it warm for 30 minutes. After the lead-bismuth alloy in the crucible is completely melted, turn on the sta...

Embodiment 2

[0023] Present embodiment technological process is with embodiment 1, and its difference technological parameter is as follows:

[0024] (1) Melting preparation: the mass fractions of lead and bismuth in the lead-bismuth alloy are 85% and 15% respectively, and the protective atmosphere in the atmosphere furnace is 99.9% argon. Cooling rate 10°C / s;

[0025] (2) Electromagnetic directional separation: the temperature of the crucible is 200°C, the temperature is kept for 15 minutes, the rising rate of the stage lifting system is 30 μm / s, and the external magnetic field strength of the crucible is 50T;

[0026] (3) Cutting and separation: Cut and separate the lead and lead-bismuth alloy column ingots with a clear interface from the interface with a sand disc cutter to obtain lead-bismuth alloys with high purity and low lead content;

[0027] (4) Preparation of high-purity lead ingots: washing with dilute acid of 0.1mol / L hydrochloric acid solution, the washing method is immersion...

Embodiment 3

[0029] Present embodiment technological process is with embodiment 1, and its difference technological parameter is as follows:

[0030] (1) Fusion preparation: the mass fractions of lead, bismuth and silver in the lead-bismuth alloy are 20%, 79.5% and 0.5% respectively, the protective atmosphere in the atmosphere furnace is 99.9% argon, the heating and melting temperature of the lead-bismuth alloy is 500°C, and the heat preservation 60min, the cooling rate of alloy melt is 20℃ / s;

[0031] (2) Electromagnetic directional separation: the temperature of the crucible is 450°C, the heat preservation is 120min, the descending rate of the lifting system of the stage is 15μm / s, and the external magnetic field strength of the crucible is 100T;

[0032] (3) Cutting and separation: Cut and separate the lead and lead-bismuth alloy column ingots with a clear interface from the interface with a sand disc cutter to obtain lead-bismuth alloys with high purity and low lead content;

[0033] ...

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Abstract

The invention discloses a method for separating high-purity lead from lead-bismuth alloy, and belongs to the technical field of nonferrous metal smelting separation and purification. The method specifically comprises the following steps that lead-bismuth alloy is heated in an atmosphere furnace, the lead-bismuth alloy is melted into molten metal, heat is preserved, the molten lead-bismuth alloy isinjected into a high-purity graphite crucible, and after the crucible is cooled at a certain rate, the crucible with the lead-bismuth alloy is placed on a carrying table of the electromagnetic directional separation medium-frequency furnace, so that the temperature of the heating zone of the intermediate frequency furnace is maintained at 200-500 DEG C; and meanwhile an objective table lifting system is started, so that the lead-bismuth alloy is directionally solidified at a certain falling rate along with an objective table from top to bottom, and finally the high-purity lead and low-lead-content lead-bismuth alloy with clear interface is obtained, and the high-purity lead is washed and dried, the high-purity lead ingot with the lead purity of more than or equal to 99.9 wt% is obtained.The method is small in equipment and investment, low in energy consumption, and environment-friendly, and can meet the requirements of current cleaning production.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of nonferrous metal smelting, in particular to a method for separating high-purity lead from lead-bismuth alloy. Background technique [0002] Lead-bismuth alloy is a by-product produced in the process of non-ferrous smelting and iron and steel smelting. Its direct use value and economic value are not high. It must be separated and purified to form high-purity refined bismuth and refined lead to play its due role. Economic and use value. [0003] The separation methods of lead and bismuth in lead-bismuth alloy mainly include electrolysis and chlorination. Electrolysis means that the lead-bismuth alloy is leached first to obtain the electrolytic mother liquor containing lead and bismuth. According to the difference in electrode potential of lead and bismuth in the solution, , lead-bismuth alloy is used as the anode plate for electrolysis, different electrolytic voltages are use...

Claims

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Application Information

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IPC IPC(8): C22B13/02C22B7/00
CPCC22B7/004C22B13/02Y02P10/20
Inventor 李银丽李彦龙余江鸿鲁兴武程亮李俞良李贵牛永胜
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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