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A kind of method that reclaims bismuth in precious lead

A technology of precious lead and bismuth lead, applied in the field of bismuth recycling, can solve the problems of unfavorable clean production and low-carbon economy, high comprehensive treatment cost, low metal recovery rate, etc., achieve great promotion potential, low processing cost, and direct metal recovery high rate effect

Active Publication Date: 2015-08-05
蒙自矿冶有限责任公司
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AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: lengthy process, many procedures, low metal recovery rate, secondary materials produced such as antimony slag, silver-zinc shell, lead chloride slag, etc. need to be recycled and processed separately, and the comprehensive treatment cost is very high and is not conducive to Cleaner Production and Low Carbon Economy
After the bismuth recovery process was improved, bismuth anode slime iron powder was leached with hydrochloric acid to produce sponge bismuth products after electrolysis of high bismuth lead.

Method used

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  • A kind of method that reclaims bismuth in precious lead
  • A kind of method that reclaims bismuth in precious lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 Shown, the method for reclaiming bismuth in this noble lead, its concrete steps are as follows:

[0024] Step 1: First put noble lead (Pb51.0wt.%, Sb14.6wt.%, Cu4.0wt.%, Bi10wt.%, Ag16wt.%) in a vacuum furnace and melt it at a temperature of 450-480°C , and then control the vacuum degree to be 10-20Pa, the temperature to be 940-960°C, and the noble lead feed rate to be 70g / s to separate lead, antimony, bismuth, and copper by vacuum distillation for 25-30 minutes, and produce a high-bismuth lead (Pb64. 3wt.%, Sb15.1wt.%, Cu0.06wt.%, Bi12.5wt.%, Ag2.27wt.%) and precious silver (Pb1.6wt.%, Sb12.7wt.%, Cu17.9wt.%, Bi1.5wt.%, Ag68.1wt.%), the output of the primary high bismuth lead is placed in a vacuum furnace, and then the lead, antimony, bismuth, and copper are separated by vacuum distillation under the above conditions to produce the secondary high bismuth lead Bismuth lead (Pb75.8wt.%, Sb3.56wt.%, Cu0.02wt.%, Bi18.6wt.%, Ag0.009wt.%) and residual pre...

Embodiment 2

[0029] Such as figure 1 Shown, the method for reclaiming bismuth in this noble lead, its concrete steps are as follows:

[0030] Step 1: First place noble lead (Pb50.0wt.%, Sb13.6wt.%, Cu3.6wt.%, Bi13wt.%, Ag18wt.%) in a vacuum furnace and melt at a temperature of 450-480°C , and then control the vacuum degree to be 10-20Pa, the temperature to be 940-960°C, and the noble lead feeding amount to be 70g / s to separate lead, antimony, bismuth, and copper by vacuum distillation for 25-30 minutes, and produce a high-bismuth lead (Pb63. 4wt.%, Sb14.2wt.%, Cu0.053wt.%, Bi14.6wt.%, Ag3.45wt.%) and precious silver (Pb1.3wt.%, Sb11.3wt.%, Cu17.1wt.%, Bi1.42wt.%, Ag69.5wt.%), the output of the primary high bismuth lead is placed in a vacuum furnace, and then the lead, antimony, bismuth and copper are separated by vacuum distillation again under the control of the above conditions to produce the secondary high bismuth lead Bismuth lead (Pb74.6wt.%, Sb2.96wt.%, Cu0.02wt.%, Bi20.3wt.%, Ag0...

Embodiment 3

[0035] Such as figure 1 Shown, the method for reclaiming bismuth in this noble lead, its concrete steps are as follows:

[0036] Step 1: First put noble lead (Pb40wt.%, Sb15.5wt.%, Cu4wt.%, Bi15wt.%, Ag19.8wt.%) in a vacuum furnace and melt it at a temperature of 450-480°C, then Vacuum distillation for 25-30 minutes to separate lead, antimony, bismuth, and copper under the conditions of controlling the vacuum degree of 10-20Pa, the temperature of 940-960°C, and the feeding amount of precious lead at 69-71g / s (grams per second), and the output is once high. Bismuth lead (Pb60.8wt.%, Sb16.4wt.%, Cu0.055wt.%, Bi16.7wt.%, Ag4.1wt.%) and precious silver (Pb1.5wt.%, Sb13.5wt.%, Cu17 .8wt.%, Bi1.66wt.%, Ag66.9wt.%), put the produced primary high-bismuth lead in a vacuum furnace, and then separate lead, antimony, bismuth, copper by vacuum distillation again under the above conditions Output of secondary high bismuth lead (Pb70.8wt.%, Sb3.23wt.%, Cu0.03wt.%, Bi24.1wt.%, Ag0.009wt.%)...

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Abstract

The invention relates to a method for recycling bismuth in bullion lead, and belongs to the field of the metallurgical technology combining a pyrogenic process with a wet process. The bullion lead is placed in a vacuum furnace first, vacuum distillation is carried out to separate lead, antimony, bismuth and copper, primary high bismuth lead and silver are produced, the produced primary high bismuth lead is placed in the vacuum furnace, vacuum distillation is conducted again to separate lead, antimony, bismuth and copper under control of the previous condition, and secondary high bismuth lead and residual silver are produced; the obtained secondary high bismuth lead and lead bullion ingredients are thrown into an anode pot to be cast into a bismuth anode plate, the bismuth anode plate is put into an electrolytic bath, mixed electrolytic refining is conducted on the bismuth anode plate together with the main process of lead electrolysis, and dissolved-out lead and washed high bismuth anode slime are obtained; the obtained high bismuth anode slime is subjected to reduction smelting and converting to produce crude bismuth; fire refining is carried out on the obtained crude bismuth, sulphur is added to the crude bismuth to remove copper, the crude bismuth is oxidized to remove arsenic and antimony, chlorine gas is led to the crude bismuth to remove lead, zinc is added to the crude bismuth to remove silver, finally caustic soda and saltpeter are added for refining, and a bismuth ingot product meeting national standards is produced. The technological process of the method is refined and simple.

Description

technical field [0001] The invention relates to a method for recovering bismuth from noble lead, and belongs to the technical field of metallurgy combining fire and wet methods. Background technique [0002] The existing technologies for recovering bismuth from precious lead are mainly: at present, the comprehensive recovery of bismuth metal in general lead smelting enterprises is divided into several types: fire method, wet method, or fire-wet method mixing; some lead smelting enterprises use pyrolysis recovery Process: After reduction smelting of converter slag, copper removal, high temperature oxidation and antimony removal are carried out, and then zinc is added to remove silver to obtain coarse bismuth products, or zinc is added to remove silver and lead is directly oxidized to remove lead to produce coarse bismuth. This method recovers bismuth defects It is high energy consumption and environmental pollution; most lead smelting enterprises use wet method to recycle bis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B30/06C22B7/00C25C1/18
CPCY02W30/54Y02P10/20
Inventor 沈江王东卢林况正国
Owner 蒙自矿冶有限责任公司
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