CN109055765A - A method of recycling refined bismuth from precious metals containing lead - Google Patents
A method of recycling refined bismuth from precious metals containing lead Download PDFInfo
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- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/06—Obtaining bismuth
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Abstract
The method that the invention discloses a kind of to recycle refined bismuth from precious metals containing lead, comprising the following steps: (1) carry out that obtained lead bismuth alloy is evaporated in vacuo by precious metals containing lead, contain Pb >=70wt%, Bi10-20wt%, Sb4-12wt% in the lead bismuth alloy；(2) lead bismuth alloy made from directly casts bismuth anode plate I, and then placing an order solely be electrolysed in fluosilicic acid system either carries out mixing electrolysis together with the main flow of lead electrolysis, obtains that lead and the rich bismuth earth of positive pole is precipitated；(3) the rich bismuth earth of positive pole obtains thick bismuth alloy after reduction melting, and thick bismuth is made by vacuum distillation in thick bismuth alloy；(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis is then carried out under fluosilicic acid system, up to refined bismuth after the precipitation bismuth refinement and fusion casting that cathode is obtained.Lead bismuth alloy is directly cast bismuth anode plate and is electrolysed by the present invention, substantially reduces the production cycle, and integrated treatment is at low cost, remarkable in economical benefits, belongs to environmentally protective metallurgical technology.
Description
Technical field
The present invention relates to technical field of non-ferrous metallurgy, in particular to a kind of method that refined bismuth is recycled from precious metals containing lead.
Background technique
It is several to be broadly divided into pyrogenic process, wet process or pyrogenic process-wet-mixing etc. for the prior art of recycling bismuth method in precious metals containing lead.Part
Lead smelting enterprise uses pyrogenic process recovery process: carrying out copper removal, high-temperature oxydation after vessel slag reduction melting again except antimony, then zincification removes
For directly logical chlorine oxidation except the thick bismuth of lead output, it is place that this mode, which recycles bismuth defect, after silver obtains thick bismuth product or zincification desilver
It manages energy consumption height and environmental pollution is big；Most lead smelting enterprises use hydrometallurgic recovery bismuth: the general later period slag with vessel slag uses nitre
Acid, hydrochloric acid or sulfuric acid add the method for salt to leach, and bismuth and part soluble metal enter in solution, then hydrolyze respectively in the solution
Each metal of precipitation and separation, obtained bismuth compound can obtain thick bismuth after pyro-refining, this mode recycle bismuth defect be have it is useless
Water generates, and increases processing waste water cost；It is zincification on the basis of pyrogenic process recycling using pyrogenic process-wet-mixing recycling bismuth technique
Electrolytic separation lead is carried out after desilver and obtains the bismuth-containing earth of positive pole, and Ore Leaching carries out hydrometallurgic recovery, this technique stream to the bismuth-containing earth of positive pole again
Journey is long, and has the shortcomings that pyrogenic process, wet process are individually handled, thus general lead smeltery is not in this way.
Applicant once in a kind of patent of invention of application on 07 28th, 2014 " recycling the method for bismuth in precious metals containing lead ", and in
On 08 05th, 2015 Granted publication, the patent No.: ZL201410362043.4.This method is tested by Industrial demonstration, is achieved
More satisfied effect.This method in the industrial production practical application when, first by precious metals containing lead by vacuum distillation separation lead, antimony,
The primary high bismuth lead of output, is then placed in vacuum drying oven by bismuth, copper, the primary high bismuth lead of output, produces again through vacuum distillation separation
Secondary high bismuth lead out, secondary high bismuth lead and lead bullion ingredient cast bismuth anode plate and control Bi in 7wt%-9wt%, Sb < 2wt%
Electrolysis is carried out to realize the separation of lead bismuth.However that in practical application in industry, there are processes is tediously long, process is more, comprehensive for the technology
The high defect of processing cost, is unfavorable for clean manufacturing and low-carbon economy.
Summary of the invention
The method that the technical problem to be solved in the present invention is to provide a kind of to recycle refined bismuth from precious metals containing lead, it is with short production cycle, it is comprehensive
It is low to close processing cost.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is as follows:
A method of recycling refined bismuth from precious metals containing lead, comprising the following steps:
(1) precious metals containing lead is carried out that obtained lead bismuth alloy is evaporated in vacuo, contains Pb >=70wt%, Bi10- in the lead bismuth alloy
20wt%, Sb4-12wt%；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then fluosilicic acid system place an order solely carry out electrolysis or
It is to carry out mixing electrolysis together with the main flow of lead electrolysis, obtains that lead and the rich bismuth earth of positive pole is precipitated；
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy after reduction melting, and thick bismuth is made by vacuum distillation in thick bismuth alloy；
(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis is then carried out under fluosilicic acid system, cathode is obtained
It is precipitated after bismuth refinement and fusion casting up to refined bismuth.
Precious metals containing lead is directly evaporated in vacuo the present invention, not only can be improved the direct yield of lead bismuth, and whole process without
Three waste discharge, working environment are good；It is electrolysed by the way that lead bismuth alloy directly to be cast to bismuth anode plate, changes original supplying lead bullion
It is produced, greatly shortens the bismuth metal recovery period, save production cost；Thick bismuth refines link, changes traditional thick bismuth pyrogenic process
Refining is that wet method electrolysis refines, and no high-temperature operation environment reduces the labor intensity of operating personnel, no exhaust gas, waste sludge discharge, and
And the use of chlorine in pyrogenic process production refined bismuth is avoided, it greatly reduces security risk risk and improves working environment.
Preferably, the precious metals containing lead contains Pb40-60wt%, Sb13-16wt%, Cu3-5wt%, Bi8-25wt%, Ag15-
20wt%.
Preferably, vacuum degree is 10-20Pa when the step (1) and step (3) are evaporated in vacuo, temperature is
940-960 DEG C, the inventory of precious metals containing lead and thick bismuth alloy is 68-72g/s.
Preferably, when being electrolysed under fluosilicic acid system in the step (2): (1) current density is 110- in electrolyte
180A/m2, Pb in electrolyte2+Content is 50-120g/l, free silicofluoric acid content is 80-120g/l, electrolyte temperature 38-
45 DEG C, electrolyte internal circulating load is 30-45L/min, electrolysis time 48-72h.
Preferably, when bismuth electrolysis is carried out in the step (4) under fluosilicic acid system: (1) current density in electrolyte
For 110-180A/m2, Bi in electrolyte2+Content is 50-120g/l, free silicofluoric acid content is 80-120g/l, electrolyte temperature
It is 38-45 DEG C, electrolyte internal circulating load is 30-45L/min, electrolysis time 48-72h.
The beneficial effects of the present invention are:
(1) when lead bismuth alloy casts bismuth anode plate, technique originally is more than half thick of lead bismuth alloy total amount of arranging in pairs or groups
Lead controls the ingredients such as bismuth, antimony to adjust, and is then electrolysed.The present invention is then not to be incorporated lead bullion to produce, by vacuum
The distillation stage adjusts lead bismuth alloy ingredient, and lead bismuth alloy is directly then cast to bismuth anode plate and is electrolysed.In vacuum distillation rank
Section adjustment lead bismuth alloy ingredient adjusts lead bismuth alloy ingredient compared to collocation lead bullion, and not only process is simple, strong operability, but also
It highly shortened the production cycle, the bismuth metal recovery period greatly shortens, the remanufacture of bismuth after implementing according to the method for the present invention
Cost is reduced close to 9000 yuan/ton, and remarkable in economical benefits in industry has great promotion potential, wide market.
(2) the thick bismuth in the present invention refines link, changes traditional thick bismuth refining as wet method electrolysis refining, no high temperature is made
Industry environment reduces the labor intensity of operating personnel, no exhaust gas, waste sludge discharge, and avoids chlorine in pyrogenic process production refined bismuth
Use, greatly reduce security risk risk and improve working environment, belong to environmentally protective metallurgical technology.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing.It should be noted that for
The explanation of these embodiments is used to help understand the present invention, but and does not constitute a limitation of the invention.In addition, disclosed below
The each embodiment of the present invention involved in technical characteristic can be combined with each other as long as they do not conflict with each other.
Embodiment 1
As shown in Figure 1, a kind of method for recycling refined bismuth from precious metals containing lead, comprising the following steps:
(1) precious metals containing lead (Pb52.5wt%, Sb13.0wt%, Cu3.9wt%, Bi8.0wt%, Ag16.1wt%) is set first
It in vacuum drying oven, is melted under the conditions of temperature is 465 DEG C, then control vacuum degree is 15Pa, temperature is 940 DEG C, precious metals containing lead feeds intake
38min is evaporated in vacuo under the conditions of being 71g/s in amount, separates lead, antimony, bismuth, copper, output lead bismuth alloy (Pb79.5wt%,
Bi10.0wt%, Sb6.3wt%) and your silver (Pb1.7wt%, Sb10.4wt%, Cu18.25wt%, Bi1.53wt%,
Ag67.2wt%), your silver directly send silver converter production thick silver；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then places an order in fluosilicic acid system and is solely electrolysed, is obtained
To precipitation lead and the rich bismuth earth of positive pole (Pb7.8wt%, Sb14.2wt%, Bi40.2wt%, Ag0.98wt%)；Wherein silicofluoric acid
Electrolytic process parameter under system specifically: (1) current density is 180A/m2, Pb in electrolyte in electrolyte2+Content be 75g/l,
Free silicofluoric acid content is 105g/l, and electrolyte temperature is 40 DEG C, and electrolyte internal circulating load is 30L/min, electrolysis time 72h.
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy, detailed process after reduction smelting in reverberatory furnace are as follows: first to rich bismuth anode
The reduction coal of rich bismuth earth of positive pole quality 7%, the soda ash of rich bismuth earth of positive pole quality 7%, rich bismuth earth of positive pole quality are separately added into mud
2% river sand, the mountain flour of richness bismuth earth of positive pole quality 2% carry out being uniformly mixed ingredient, then when in-furnace temperature reaches 1200 DEG C
Put into ingredient, keep smelting temperature be 1200 DEG C of melting 6h after cool down, when in-furnace temperature reaches 830 DEG C blow arsenic removal, antimony,
Tin, and 780 DEG C of temperature 2.5 times of investment deleading agents according to lead quality in the rich bismuth earth of positive pole is being kept to carry out depth except lead output is thick
Bismuth alloy, deleading agent are ammonium dihydrogen phosphate (NH4H2PO4), the final thick bismuth alloy of output (Pb1.0wt%, Sb1.0wt%,
Bi84.9wt%, Ag1.01wt%), output oxygen powder (Pb0.90wt%, Sb56.5wt%, Bi4.0wt%, Ag0.0042wt%)
Antimony system production star metal is sent, output lead slag-removed (Pb58.5wt%, Sb1.2wt%, Bi2.01wt%, Ag0.0022wt%) is sent molten
Refining system melting output lead bullion together with lead concentrate；By thick bismuth alloy carry out vacuum distillation be made thick bismuth (Bi97.5wt%,
Ag85g/t), wherein the vacuum distillation same above-mentioned steps of operating condition (1)；
(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis is then carried out under fluosilicic acid system, wherein in silicofluoric acid
The technological parameter of bismuth electrolysis is carried out under system are as follows: (1) current density is 120A/m in electrolyte2, Bi in electrolyte2+Content is
80g/l, free silicofluoric acid content are 90g/l, and electrolyte temperature is 38 DEG C, and electrolyte internal circulating load is 35L/min, electrolysis time
48h.The bismuth ingot product for meeting national standard Bi998 grade will be obtained after precipitation bismuth refinement and fusion casting that cathode obtains.
Embodiment 2
As shown in Figure 1, a kind of method for recycling refined bismuth from precious metals containing lead, comprising the following steps:
(1) precious metals containing lead (40.0wt%, Sb16.5wt%, Cu5wt%, Bi12.4wt%, Ag15.0wt%) is placed in first
It in vacuum drying oven, is melted under the conditions of temperature is 450 DEG C, then control vacuum degree is 20Pa, temperature is 950 DEG C, precious metals containing lead inventory
To be evaporated in vacuo 35min under the conditions of 69g/s, lead, antimony, bismuth, copper are separated, output lead bismuth alloy (Pb70.0wt%, Sb8.7wt%,
Bi16.7wt%, Ag0.25wt%) and your silver, it is thick silver-colored that your silver directly send silver converter to produce；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then places an order in fluosilicic acid system and is solely electrolysed, is obtained
To precipitation lead and the rich bismuth earth of positive pole (Pb6.4wt%, Sb13.3wt%, Bi42.5wt%, Ag1.48wt%)；Wherein silicofluoric acid
Electrolytic process parameter under system specifically: (1) current density is 125A/m in electrolyte2, Pb in electrolyte2+Content is 120g/
L, silicofluoric acid content of dissociating is 120g/l, and electrolyte temperature is 45 DEG C, and electrolyte internal circulating load is 32L/min, electrolysis time 60h.
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy, detailed process after reduction smelting in reverberatory furnace are as follows: first to rich bismuth anode
The reduction coal of rich bismuth earth of positive pole quality 7%, the soda ash of rich bismuth earth of positive pole quality 7%, rich bismuth earth of positive pole quality are separately added into mud
2% river sand, the mountain flour of richness bismuth earth of positive pole quality 2% carry out being uniformly mixed ingredient, then when in-furnace temperature reaches 1200 DEG C
Put into ingredient, keep smelting temperature be 1250 DEG C of melting 6h after cool down, when in-furnace temperature reaches 800 DEG C blow arsenic removal, antimony,
Tin, and 800 DEG C of temperature 2.5 times of investment deleading agents according to lead quality in the rich bismuth earth of positive pole is being kept to carry out depth except lead output is thick
Bismuth alloy, deleading agent are ammonium dihydrogen phosphate (NH4H2PO4), the final thick bismuth alloy of output (Pb0.9wt%, Sb1.0wt%,
Bi80.9wt%, Ag1.01wt%), output oxygen powder send antimony system production star metal, and output is lead slag-removed to send smelting system and lead concentrate
Melting output lead bullion together；Thick bismuth alloy is subjected to vacuum distillation, thick bismuth (Bi96.5wt%, Ag92g/t) is made, wherein vacuum
The same above-mentioned steps of distillation procedure condition (1)；
(4) thick bismuth is directly cast into bismuth anode plate II, is then electrolysed under fluosilicic acid system, wherein in silicofluoric acid body
The lower technological parameter for carrying out bismuth electrolysis of system are as follows: (1) current density is 110A/m in electrolyte2, Bi in electrolyte2+Content is
120g/l, free silicofluoric acid content are 80g/l, and electrolyte temperature is 40 DEG C, and electrolyte internal circulating load is 40L/min, electrolysis time
72h.The bismuth ingot product for meeting national standard Bi998 grade will be obtained after precipitation bismuth refinement and fusion casting that cathode obtains.
Embodiment 3
As shown in Figure 1, a kind of method for recycling refined bismuth from precious metals containing lead, comprising the following steps:
(1) first by precious metals containing lead (Pb57.0wt%, Sb16.5wt%, Cu3.0wt%, Bi14.3wt%, Ag20.0wt%)
It is placed in vacuum drying oven, is melted under the conditions of temperature is 480 DEG C, then control vacuum degree is 10Pa, temperature is 960 DEG C, precious metals containing lead is thrown
45min is evaporated in vacuo under the conditions of being 68g/s in doses, separates lead, antimony, bismuth, copper, output lead bismuth alloy (Pb81.1wt%,
Sb12.2wt%, Bi17.6wt%, Ag0.55wt%) and your silver, it is thick silver-colored that your silver directly send silver converter to produce；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then the main flow under fluosilicic acid system with lead electrolysis
Carry out mixing electrolysis together, obtain being precipitated lead and the rich bismuth earth of positive pole (Pb7.8wt%, Sb14.2wt%, Bi40.2wt%,
Ag0.98wt%)；Wherein electrolytic process parameter under fluosilicic acid system specifically: (1) add in the main flow electrolyte being electrolysed to lead
The ox glue and 0.02-0.06kg/tPb betanaphthol for entering 0.5-0.8kg/tPb are combined into new electrolyte；(2) it is combined into new
Current density 150A/m in electrolyte2, Pb2+Content 80g/l, free silicofluoric acid 90g/l, 38 DEG C of electrolyte temperature, electrolyte follows
48h is produced in a cell under the conditions of circular rector 45L/min.
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy, detailed process after reduction smelting in reverberatory furnace are as follows: first to rich bismuth anode
The reduction coal of rich bismuth earth of positive pole quality 7%, the soda ash of rich bismuth earth of positive pole quality 7%, rich bismuth earth of positive pole quality are separately added into mud
2% river sand, the mountain flour of richness bismuth earth of positive pole quality 2% carry out being uniformly mixed ingredient, then when in-furnace temperature reaches 1200 DEG C
Put into ingredient, keep smelting temperature be 1230 DEG C of melting 6h after cool down, when in-furnace temperature reaches 820 DEG C blow arsenic removal, antimony,
Tin, and 790 DEG C of temperature 2.5 times of investment deleading agents according to lead quality in the rich bismuth earth of positive pole is being kept to carry out depth except lead output is thick
Bismuth alloy, deleading agent are ammonium dihydrogen phosphate (NH4H2PO4), the final thick bismuth alloy of output (Pb1.0wt%, Sb1.0wt%,
Bi84.9wt%, Ag1.01wt%), output oxygen powder (Pb0.90wt%, Sb56.5wt%, Bi4.0wt%, Ag0.0042wt%)
Antimony system production star metal is sent, output lead slag-removed (Pb58.5wt%, Sb1.2wt%, Bi2.01wt%, Ag0.0022wt%) is sent molten
Refining system melting output lead bullion together with lead concentrate；By thick bismuth alloy carry out vacuum distillation be made thick bismuth (Biwt98.2%,
Ag114g/t), wherein the vacuum distillation same above-mentioned steps of operating condition (1)；
(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis is then carried out under fluosilicic acid system, wherein in silicofluoric acid
The technological parameter of bismuth electrolysis is carried out under system are as follows: (1) current density is 180A/m in electrolyte2, Bi in electrolyte2+Content is
50g/l, free silicofluoric acid content are 110g/l, and electrolyte temperature is 38 DEG C, and electrolyte internal circulating load is 45L/min, electrolysis time
48h.The bismuth ingot product for meeting national standard Bi998 grade will be obtained after precipitation bismuth refinement and fusion casting that cathode obtains.
Embodiment 4
As shown in Figure 1, a kind of method for recycling refined bismuth from precious metals containing lead, comprising the following steps:
(1) first by precious metals containing lead (Pb60.0wt%, Sb12.5wt%, Cu4.6wt%, Bi25.5wt%, Ag17.4wt%)
It is placed in vacuum drying oven, is melted under the conditions of temperature is 470 DEG C, then control vacuum degree is 18Pa, temperature is 955 DEG C, precious metals containing lead is thrown
48min is evaporated in vacuo under the conditions of being 70g/s in doses, separates lead, antimony, bismuth, copper, output lead bismuth alloy (Pb77.6wt%,
Sb4.0wt%, Bi20.10wt%, Ag0.75wt%) and your silver (Pb1.7wt%, Sb10.4wt%, Cu18.25wt%,
Bi1.53wt%, Ag67.2wt%), your silver directly send silver converter production thick silver；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then places an order in fluosilicic acid system and is solely electrolysed, is obtained
To precipitation lead and the rich bismuth earth of positive pole (Pb7.8wt%, Sb14.2wt%, Bi40.2wt%, Ag0.98wt%)；Wherein silicofluoric acid
Electrolytic process parameter under system specifically: (1) current density is 110A/m in electrolyte2, Pb in electrolyte2+Content be 50g/l,
Free silicofluoric acid content is 80g/l, and electrolyte temperature is 40 DEG C, and electrolyte internal circulating load is 40L/min, electrolysis time 72h.
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy, detailed process after reduction smelting in reverberatory furnace are as follows: first to rich bismuth anode
The reduction coal of rich bismuth earth of positive pole quality 7%, the soda ash of rich bismuth earth of positive pole quality 7%, rich bismuth earth of positive pole quality are separately added into mud
2% river sand, the mountain flour of richness bismuth earth of positive pole quality 2% carry out being uniformly mixed ingredient, then when in-furnace temperature reaches 1200 DEG C
Ingredient is put into, cools down after keeping smelting temperature to be 1200-1250 DEG C of melting 6h, is blown when in-furnace temperature reaches 800-830 DEG C
Arsenic removal, antimony, tin are refined, and 780-800 DEG C of temperature 2.5 times of investment deleading agents according to lead quality in the rich bismuth earth of positive pole is being kept to carry out
Depth removes the thick bismuth alloy of lead output, and deleading agent is ammonium dihydrogen phosphate (NH4H2PO4), the final thick bismuth alloy of output (Pb1.0wt%,
Sb1.0wt%, Bi84.9wt%, Ag1.01wt%), output oxygen powder send antimony system production star metal, and output is lead slag-removed to send melting system
System melting output lead bullion together with lead concentrate；Thick bismuth alloy is subjected to vacuum distillation, thick bismuth (Bi98.5wt%, Ag104g/ is made
T), wherein the vacuum distillation same above-mentioned steps of operating condition (1)；
(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis is then carried out under fluosilicic acid system, wherein in silicofluoric acid
The technological parameter of bismuth electrolysis is carried out under system are as follows: (1) current density is 120A/m in electrolyte2, Bi in electrolyte2+Content is
80g/l, free silicofluoric acid content are 75g/l, and electrolyte temperature is 35 DEG C, and electrolyte internal circulating load is 38L/min, electrolysis time
60h.The bismuth ingot product for meeting national standard Bi998 grade will be obtained after precipitation bismuth refinement and fusion casting that cathode obtains.
In conjunction with attached drawing, the embodiments of the present invention are described in detail above, but the present invention is not limited to described implementations
Mode.For a person skilled in the art, in the case where not departing from the principle of the invention and spirit, to these embodiments
A variety of change, modification, replacement and modification are carried out, are still fallen in protection scope of the present invention.
Claims (5)
1. a kind of method for recycling refined bismuth from precious metals containing lead, it is characterised in that: the following steps are included:
(1) precious metals containing lead be evaporated in vacuo obtained lead bismuth alloy, in the lead bismuth alloy containing Pb >=70wt%, Bi10-20wt%,
Sb4-12wt%；
(2) lead bismuth alloy made from directly casts bismuth anode plate I, then fluosilicic acid system place an order solely be electrolysed either with
The main flow of lead electrolysis carries out mixing electrolysis together, obtains that lead and the rich bismuth earth of positive pole is precipitated；
(3) the rich bismuth earth of positive pole obtains thick bismuth alloy after reduction melting, and thick bismuth is made by vacuum distillation in thick bismuth alloy；
(4) thick bismuth is directly cast into bismuth anode plate II, bismuth electrolysis, the precipitation that cathode is obtained then is carried out under fluosilicic acid system
Up to refined bismuth after bismuth refinement and fusion casting.
2. a kind of method for recycling refined bismuth from precious metals containing lead according to claim 1, it is characterised in that: the precious metals containing lead contains
Pb40-60wt%, Sb13-16wt%, Cu3-5wt%, Bi8-25wt%, Ag15-20wt%.
3. a kind of method for recycling refined bismuth from precious metals containing lead according to claim 1 or 2, it is characterised in that: the step (1)
Vacuum degree is 10-20Pa when being evaporated in vacuo with step (3), and temperature is 940-960 DEG C, and precious metals containing lead and thick bismuth alloy feed intake
Amount is 68-72g/s.
4. a kind of method for recycling refined bismuth from precious metals containing lead according to claim 1 or 2, it is characterised in that: the step (2)
In when being electrolysed under fluosilicic acid system: (1) current density is 110-180A/m in electrolyte2, Pb in electrolyte2+Content is 50-
120g/l, free silicofluoric acid content are 80-120g/l, and electrolyte temperature is 38-45 DEG C, and electrolyte internal circulating load is 30-45L/
Min, electrolysis time 48-72h.
5. a kind of method for recycling refined bismuth from precious metals containing lead according to claim 1 or 2, it is characterised in that: the step (4)
In under fluosilicic acid system carry out bismuth electrolysis when: (1) in electrolyte current density be 110-180A/m2, Bi in electrolyte2+Content
It is 80-120g/l for 50-120g/l, free silicofluoric acid content, electrolyte temperature is 38-45 DEG C, and electrolyte internal circulating load is 30-
45L/min, electrolysis time 48-72h.
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