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Method for separating multi-element alloy of lead, bismuth, gold, silver and copper

A multi-element alloy and lead separation technology, applied in the direction of improving process efficiency, can solve the problems of cumbersome processing process and large loss of gold and silver.

Inactive Publication Date: 2010-04-21
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process is cumbersome, and the precious metals, gold and silver, are recycled at the end of the process. During the whole recovery process, the loss of gold and silver is relatively large.

Method used

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  • Method for separating multi-element alloy of lead, bismuth, gold, silver and copper
  • Method for separating multi-element alloy of lead, bismuth, gold, silver and copper
  • Method for separating multi-element alloy of lead, bismuth, gold, silver and copper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: See Table 1 for the material composition used in the test.

[0013] Table 1 Raw material main component weight percent

[0014]

[0015] Put 2000g of raw material lead, bismuth, gold, silver and copper multi-element alloy into graphite crucible and place it in a vacuum furnace, pump the vacuum in the furnace to 10Pa, start to heat up at a rate of 5°C / min, when the temperature in the furnace rises to the melting point of the raw material 450 ℃, keep the temperature constant for 30 minutes, then raise the temperature to 950 ℃ at a rate of 15 ℃ / min, continue to heat up to 1100 ℃ after 10 minutes of constant temperature, constant temperature distillation and separation for 60 minutes, and the volatilized lead and bismuth vapor continuously escapes from the liquid alloy and is collected in the condensation tray. Turn off the power and start to cool down, continue to ensure the vacuum in the furnace to prevent the material from being oxidized. When the temper...

Embodiment 2

[0020] Table 3 Material main component weight percentage

[0021]

[0022] The specific implementation steps are as follows:

[0023] Put 2000g of raw material lead, bismuth, gold, silver and copper multi-element alloy into graphite crucible and place it in a vacuum furnace, pump the vacuum in the furnace to 5Pa, start to heat up at a rate of 5°C / min, when the temperature in the furnace rises to the melting point of the raw material at 350 ℃, keep the constant temperature for 40 minutes, then raise the temperature to 900 ℃ at a rate of 15 ℃ / min, continue to raise the temperature to 1050 ℃ after 15 minutes, and continue to heat up to 1050 ℃, constant temperature distillation and separation for 80 minutes, the volatilized lead and bismuth vapor continuously escapes from the liquid alloy and enters the condensation tray Turn off the power and start to cool down. Continue to ensure the vacuum in the furnace to prevent the material from being oxidized. When the temperature in th...

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Abstract

The invention relates to a method for separating a multi-element alloy of lead, bismuth, gold, silver and copper, which adopts a vacuum distillation method to treat the multi-element alloy, wherein the distillation temperature is 1,050 to 1,100 DEG C, the distillation time is 60 to 80min and the vacuum degree in a furnace is 5 to 15 Pa. Materials can be separated into a volatile (an alloy of lead and bismuth) and a residue (an alloy of gold, silver and copper). In the separated product, noble metals are gathered in 6 to 7 times; the recovery rate of each noble metal is over 99 percent; the loss of the noble metals is low; and the recovery rates of the lead and the bismuth are 98 percent and 98.5 percent respectively.

Description

1. Technical field: [0001] The invention relates to a method for separating lead, bismuth, gold, silver and copper multi-element alloys, belonging to the technical field of vacuum metallurgy. 2. Background technology [0002] Lead-bismuth-gold-silver-copper multi-element alloys have a high content of precious metals and need to be recovered and purified. There are many kinds of elements in this alloy, and the composition is complex, so the processing method should strive for short process, continuous production, compact equipment, less various return materials, and short production cycle, so as to improve the direct metal recovery rate and reduce metal loss and capital backlog. At present, the known processing of this multi-element alloy mainly adopts the step-by-step process of bismuth removal→copper removal→silver extraction→gold extraction, which focuses on recovery. The common method of removing bismuth is mainly converter oxidation blowing to obtain bismuth oxide slag ...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B9/04C22B11/00C22B15/00C22B13/00C22B30/06C22C30/04C22C11/08
CPCY02P10/20
Inventor 刘大春杨斌戴卫平贾国斌刘媛媛徐宝强速斌王飞邓勇熊恒
Owner KUNMING UNIV OF SCI & TECH
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