Method for recovering refined bismuth from noble lead

A technology of precious lead and refined bismuth, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of unfavorable clean production and low-carbon economy, high comprehensive treatment cost, and lengthy process, and shorten the recycling cycle of bismuth metal , shorten the production cycle, good working environment

Inactive Publication Date: 2018-12-21
蒙自矿冶有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual industrial application of this technology, there are defects such as lengthy process, many procedures, and high comprehensive treatment cost, which is not conducive to clean production and low-carbon economy.

Method used

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  • Method for recovering refined bismuth from noble lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown, a kind of method for recovering refined bismuth from precious lead, comprises the following steps:

[0023] (1) First noble lead (Pb52.5wt%, Sb13.0wt%, Cu3.9wt%, Bi8.0wt%, Ag16.1wt%) is placed in a vacuum furnace, melted at a temperature of 465 ° C, and then controlled The vacuum degree is 15Pa, the temperature is 940 ℃, and the noble lead feeding amount is vacuum distillation 38min under the condition of 71g / s, separates lead, antimony, bismuth, copper, and produces lead-bismuth alloy (Pb79.5wt%, Bi10.0wt%, Sb6 .3wt%) and precious silver (Pb1.7wt%, Sb10.4wt%, Cu18.25wt%, Bi1.53wt%, Ag67.2wt%), precious silver is directly sent to silver converter to produce crude silver;

[0024] (2) The lead-bismuth alloy obtained is directly cast into bismuth anode plate I, and then electrolyzed separately under the silicofluoric acid system, obtains to separate out lead and rich bismuth anode slime (Pb7.8wt%, Sb14.2wt%, Bi40.2wt% %, Ag0.98wt%); wherein the e...

Embodiment 2

[0028] Such as figure 1 Shown, a kind of method for recovering refined bismuth from precious lead, comprises the following steps:

[0029] (1) At first noble lead (40.0wt%, Sb16.5wt%, Cu5wt%, Bi12.4wt%, Ag15.0wt%) is placed in the vacuum furnace, is melted under the condition of 450 ℃ at temperature, then controls vacuum degree to be 20Pa, temperature is 950 ℃, noble lead feed rate is vacuum distillation 35min under the condition of 69g / s, separates lead, antimony, bismuth, copper, produces lead-bismuth alloy (Pb70.0wt%, Sb8.7wt%, Bi16.7wt% , Ag0.25wt%) and precious silver, precious silver is directly sent to silver converter to produce crude silver;

[0030] (2) The lead-bismuth alloy that makes is directly cast into bismuth anode plate 1, then carries out electrolysis separately under silicofluoric acid system, obtains and separates out lead and rich bismuth anode slime (Pb6.4wt%, Sb13.3wt%, Bi42.5wt% %, Ag1.48wt%); wherein the electrolytic process parameters under the flu...

Embodiment 3

[0034] Such as figure 1 Shown, a kind of method for recovering refined bismuth from precious lead, comprises the following steps:

[0035] (1) First noble lead (Pb57.0wt%, Sb16.5wt%, Cu3.0wt%, Bi14.3wt%, Ag20.0wt%) is placed in a vacuum furnace, melted at a temperature of 480 ° C, and then controlled The vacuum degree is 10Pa, the temperature is 960 ℃, and the noble lead feed rate is vacuum distillation for 45min under the condition of 68g / s to separate lead, antimony, bismuth and copper, and produce lead-bismuth alloy (Pb81.1wt%, Sb12.2wt%, Bi17 .6wt%, Ag0.55wt%) and precious silver, precious silver is directly sent to silver converter to produce rough silver;

[0036] (2) The lead-bismuth alloy obtained is directly cast into bismuth anode plate I, and then mixed electrolysis is carried out together with the main process of lead electrolysis under the fluorosilicic acid system to obtain separated lead and bismuth-rich anode slime (Pb7.8wt%, Sb14 .2wt%, Bi40.2wt%, Ag0.98wt%)...

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Abstract

The invention discloses a method for recovering refined bismuth from noble lead. The method comprises the following steps: (1) vacuum distillation is carried out on the noble lead to prepare lead-bismuth alloy, and the lead-bismuth alloy comprises more than or equal to 70 wt% of Pb, 10 wt% -20 wt% of Bi and 4-12wt% of Sb; (2) the prepared lead-bismuth alloy is directly cast into a first bismuth anode plate, and then electrolysis or mixed electrolysis together with a main process of lead electrolysis is carried out in a silicon-fluorine acid system so as to obtain lead-out lead and bismuth-richanode mud; (3) reduction smelting is carried out on the bismuth-rich anode slime to obtain a crude bismuth alloy, and vacuum distillation is carried out on the crude bismuth alloy to prepare crude bismuth; and (4) the crude bismuth is directly cast into a second bismuth anode plate, then bismuth electrolysis is carried out in a silicofluoric acid system, and the separated bismuth obtained by thecathode is refined and melted to obtain the refined bismuth. According to the method, the lead-bismuth alloy is directly cast into the bismuth anode plate for electrolysis, so that the production period is greatly shortened, the comprehensive treatment cost is low, the economic benefit is remarkable, and the method belongs to a green and environment-friendly metallurgy process.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for recovering refined bismuth from noble lead. Background technique [0002] The prior art of recovering bismuth from precious lead is mainly divided into fire method, wet method or fire-wet mixed method. Some lead smelting enterprises adopt pyrolysis recovery process: copper removal after converter slag reduction smelting, high-temperature oxidation and antimony removal, and then adding zinc to remove silver to obtain crude bismuth products, or adding zinc to remove silver and directly passing chlorine gas to oxidize and remove lead to produce crude bismuth products. Bismuth, the defect of bismuth recovery in this way is high energy consumption and high environmental pollution; most lead smelting enterprises use wet method to recover bismuth: generally, the late slag of converter slag is leached by nitric acid, hydrochloric acid or sulfuric acid plus salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/06C22B11/02C22B30/02C22B13/02C25C1/18
CPCC22B7/001C22B7/004C22B7/006C22B11/02C22B13/02C22B30/02C22B30/06C25C1/18Y02P10/20
Inventor 冯继平曾繁顺周忠跃吴剑鹏况正国唐剑光邓学文
Owner 蒙自矿冶有限责任公司
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