CN116814956A - Method for improving gold and silver recovery rate by coarse silver fire refining copper removal - Google Patents
Method for improving gold and silver recovery rate by coarse silver fire refining copper removal Download PDFInfo
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- CN116814956A CN116814956A CN202310830627.9A CN202310830627A CN116814956A CN 116814956 A CN116814956 A CN 116814956A CN 202310830627 A CN202310830627 A CN 202310830627A CN 116814956 A CN116814956 A CN 116814956A
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- 239000010949 copper Substances 0.000 title claims abstract description 88
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 87
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 69
- 239000004332 silver Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 43
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000010931 gold Substances 0.000 title claims abstract description 37
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 36
- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 238000007670 refining Methods 0.000 title claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 39
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 17
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000002386 leaching Methods 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 239000007769 metal material Substances 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 12
- 229910052787 antimony Inorganic materials 0.000 claims description 12
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 12
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 235000017550 sodium carbonate Nutrition 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 229910001245 Sb alloy Inorganic materials 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000002140 antimony alloy Substances 0.000 claims description 6
- 235000010333 potassium nitrate Nutrition 0.000 claims description 6
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical group [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical group [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000005292 vacuum distillation Methods 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 229910002651 NO3 Inorganic materials 0.000 description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0065—Leaching or slurrying
- C22B15/0067—Leaching or slurrying with acids or salts thereof
- C22B15/0071—Leaching or slurrying with acids or salts thereof containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/02—Obtaining antimony
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/04—Refining by applying a vacuum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for improving gold and silver recovery rate by refining copper by a coarse silver fire method, which comprises the following steps: the copper-containing noble metal material is processed by a reduction smelting-vacuum distillation process to produce crude silver alloy; the crude silver alloy is refined by a fire method by utilizing a silver separating furnace, and compressed air is blown in to remove impurities; then adding a slag former into the crude silver melt, and simultaneously performing insert blowing; finally, adding a copper removing agent in batches to perform oxidation copper removal; and (3) carrying out pressurized acid leaching on the copper-removed slag to recover gold, silver and copper. The production process provided by the invention can efficiently remove impurity copper in the crude silver alloy, simultaneously reduce the grade of gold and silver in copper-removing slag, comprehensively recover gold and silver and copper after the copper-removing slag is treated by a wet process, and improve the recovery rate of gold and silver. Meanwhile, the method can not generate pollution gas and reduce environmental pollution.
Description
Technical Field
The invention belongs to the technical field of pyrometallurgy processes, and relates to a method for improving gold and silver recovery rate by refining copper removal through crude silver in a fire method.
Background
Aiming at high copper lead anode slime and copper-containing noble metal materials, in the process of extracting noble metals by fire refining, copper in the lead anode slime can be oxidized and slagging to achieve the purpose of separating the copper from the noble metals by adding a strong oxidant into a silver separating furnace, the higher the viscosity of slag is, the more the copper oxide is contained in the silver separating furnace slag, the more the noble metals are physically entrained during slag discharge, the recovery rate of the noble metals is greatly influenced, and meanwhile, the copper oxide slag needs to be returned to the furnace again due to the higher grade of the noble metals, so that the smelting cost is increased.
The technology for the fire refining copper removal of noble metal materials is mainly divided into two main types according to the classification of raw materials, one type is mainly aimed at the removal of copper in the smelting process of lead and antimony, the technology is basically biased to the sulfuration copper removal, such as a copper removal agent for antimony smelting production and application thereof (CN 111041231A) proposed by Wang Weiguo of Guangxi Mo Shizhi rare noble metal technology, and the copper removal agent for antimony smelting production is developed, wherein the copper removal agent comprises elemental sulfur or sulfur-containing compounds, and the elemental phosphorus or phosphorus-containing compounds; the copper removing agent for antimony refining is prepared by singly using the two substances of the elemental sulfur or the sulfur-containing compound and the elemental phosphorus or the phosphorus-containing compound or mixing the two substances according to a certain proportion. A method for treating an antimony-containing high-tin high-copper alloy (CN 109306409A) is proposed by Mongolian mining and metallurgy Limited liability company Xu Peilun and the like, and the temperature is utilized to progressively decrease from high to low to separate tin, antimony and copper in sequence. Both the above two processes adopt a liquation-sulphuration copper removal mode to separate copper from antimony, but in order to reduce the grade of copper elements below a certain range, the above processes firstly need to repeatedly adjust the temperature difference to carry out liquation copper removal, thus seriously affecting the production efficiency of antimony; in the process of adding sulfur, the sulfur can react with copper after reacting with antimony, excessive sulfide is needed, and a large amount of solid slag can be formed by the excessive sulfide in the subsequent production process, so that the subsequent environmental protection cost is increased. The other is high-melting point nonferrous metal, mainly aiming at the smelting production of gold and silver, because the fire refining temperature of gold and silver needs to be above 1000 ℃, under the process condition, sulfur directly burns and volatilizes and cannot play a role in removing copper, aiming at the high-melting point nonferrous metal, the conventional copper removing process mainly comprises adding Sal into a silver separating furnace and adding flake alkali to assist copper removal, no related patent publication is made in China at present, the copper removing process of the silver separating furnace is introduced in the production practice controlled by the impurities of gold and silver alloy plates published by Li Zhi and the like in journal copper industry engineering, and Sal copper removing traditional fire cleaning alloy is characterized in that Sal is added into the silver separating furnace, and Sal and gold and silver melt are fully contacted through manual stirring. However, the defects are that the nitrate density is small and the nitrate is extremely easy to decompose at high temperature, the utilization rate of the nitrate is extremely low, the effect of the nitrate clear alloy is not satisfactory through the exploration of the production process control, and the main is that the nitrate produces copper slag, the gold and silver grade is high, the copper element must be reprocessed, but the copper element is not opened all the time and is enriched in the process.
Therefore, copper removal refining of copper-containing high-melting-point metal is performed, the aim is to improve the yield of gold and silver, reduce the production cost, lighten the environmental protection pressure, realize the comprehensive recovery of valuable elements and create better economic and social benefits.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a method for improving the recovery rate of gold and silver by refining copper by using a coarse silver fire method.
The technical scheme of the invention is realized as follows: a method for improving gold and silver recovery rate by fire refining copper removal of crude silver comprises the following process steps:
a copper-containing noble metal material, coke and sodium carbonate are subjected to ore blending according to a ratio of 100:5-8:5-12, and are subjected to reduction smelting at a temperature of 1200-1250 ℃ to produce crude antimony alloy, and the crude antimony alloy is subjected to oxidation blowing-vacuum rectification treatment to produce crude silver alloy;
b, adding the crude silver alloy into a silver separating furnace, blowing compressed air at the temperature of 1000-1100 ℃ to perform insertion blowing to remove impurities, and stopping blowing operation after observing that no obvious smoke exists on the surface of crude silver molten liquid and the surface is shiny;
c, adding a slag former into the crude silver melt, simultaneously carrying out insertion blowing, stopping insertion blowing after observing that the scum on the surface of the melt is completely covered, and removing solid oxide slag formed by slag formation of oxides on the surface of the alloy melt;
d, adding a copper removing agent into the alloy melt in the step c to perform oxidation copper removal;
e, oxidizing and removing copper in the step d to produce copper-removed slag, wherein copper in the copper-removed slag enters a liquid phase in a copper sulfate form through a pressurizing and acid leaching process, and is subjected to acid-base neutralization to produce crude copper slag, and precious metal gold and silver are left in the slag to return to a silver separating furnace for smelting treatment;
preferably, the crude silver alloy in the step a contains 0.4 to 0.6 percent of gold, 42 to 50 percent of silver, 12 to 16 percent of copper and 15 to 20 percent of antimony;
preferably, in the step b, compressed air is adopted for blowing, and an air pipe is inserted 20cm below the liquid surface and has the function of removing As, sb, pb and part of Cu in the crude silver alloy;
preferably, in the step c, the slag former is sodium carbonate and saltpeter, and the adding proportion is as follows: soda ash: niter = 100: 3-5:1-2, adding sodium carbonate to remove Se and Te and form solid slag, and adding saltpeter to decompose and release oxygen under the action of high temperature to strengthen the oxidation atmosphere and ensure that the generated solid slag is oxide slag;
preferably, in the step d, the copper removing agent is iron red, and the addition amount is iron-copper mole ratio 2:5, adding in three batches according to the mass ratio of 4:3:3, wherein the time interval between each addition is 1-2 hours, so that the reaction can be fully performed;
preferably, the pressure of the pressurized acid leaching in the step e is 0.6Mpa, the sulfuric acid concentration is 3mol/L, and the liquid-solid ratio is 5:1, leaching temperature is 60 ℃.
The beneficial effects of the invention are as follows: according to the method for improving the recovery rate of gold and silver by the fire refining copper removal of crude silver, iron red is used for replacing Sal Nitri to remove copper, decomposition does not occur at a high temperature of more than 1300 ℃, the density of the iron red is higher than that of Sal Nitri, the iron red has strong permeability in a molten state and can react with copper below the liquid level of crude silver melt, and the aim of effectively removing copper is achieved; the iron oxide red has good fluidity in a molten state, and can not agglomerate and mix gold and silver in the copper removal process, so that the grade of gold and silver in copper removal slag is reduced, and the gold and silver yield is improved. The adoption of the iron oxide red has the advantages that no pollution gas is generated in the reaction process, and the method is environment-friendly.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
For a better understanding and implementation, the following detailed description of the present invention is provided in connection with the examples, which are not intended to limit the scope of the invention.
The following details a method for refining crude silver by fire to remove copper and improve gold and silver recovery rate:
example 1: the method comprises the following steps:
copper-containing noble metal materials, coke and sodium carbonate are subjected to ore blending according to a ratio of 100:5:8, reduction smelting is carried out at 1230 ℃, crude antimony alloy is produced, the crude antimony alloy is transferred into an oxidation pot for converting antimony white after being refined, antimony white products are produced, and residual alloy after converting antimony white is used as a raw material for producing gold and silver and is separated by a vacuum distillation process to obtain crude silver alloy containing 0.48% of gold, 45.32% of silver, 14.45% of copper and 18.66% of antimony (see Table I);
table one crude silver alloy content of each element
And 5 tons of the produced crude silver alloy are melted by a silver separating furnace, and compressed air is blown into the crude silver alloy at 1100 ℃ after the crude silver alloy is melted to perform insertion blowing to remove impurities. Adding 175Kg of sodium carbonate and 50Kg of saltpeter, simultaneously performing insert blowing, adding iron oxide red for three times according to 101Kg, 76Kg and 76Kg, and continuously converting at an interval of 1h each time, wherein 2125Kg of copper slag is produced, and 2349Kg of alloy is removed after copper. Copper slag is subjected to ball milling-pressurizing acid leaching technology, the pressure is 0.6Mpa, the sulfuric acid concentration is 3mol/L, the liquid-solid ratio is 5:1, the leaching temperature is 60 ℃, and precious metal gold and silver in the leached slag are returned to a silver separating furnace for smelting treatment.
Comparative example 1: 5 tons of crude silver alloy is melted by a silver separating furnace, compressed air is blown into the furnace at 1100 ℃ after the melting, the impurities are removed by inserting blowing, 175kg of sodium carbonate and 250kg of saltpeter are added, inserting blowing is carried out at the same time, 2050kg of copper slag is produced, and 2311kg of alloy is removed after copper. And (5) converting copper slag into copper smelting system for treatment.
Table two comparison of the contents of the elements in the copper slag produced in the examples and comparative examples
Remarks: the unit of the element is g/t.
Table three examples and comparative examples comparison of the content of each element in the alloy after copper removal
Table four comparison of gold and silver recovery rates for examples and comparative examples
Conclusion: in example 1, iron oxide red is used as an oxidant, and compared with the copper removal by using saltpeter as an oxidant in comparative example 1, the quality of copper slag and the quality of alloy after copper removal are both increased, but the increase range is not large, in example 1, the grade of gold and silver in the copper slag is obviously reduced, the grade of copper is obviously increased, and the copper removal effect is obvious. Copper removal slag is treated in two ways, the gold recovery rate of the embodiment 1 is increased by 2.54%, and the silver recovery rate is increased by 3%.
Claims (6)
1. A method for improving gold and silver recovery rate by fire refining copper removal of crude silver is characterized by comprising the following process steps:
a copper-containing noble metal material, coke and sodium carbonate are subjected to ore blending according to a ratio of 100:5-8:5-12, and are subjected to reduction smelting at a temperature of 1200-1250 ℃ to produce crude antimony alloy, and the crude antimony alloy is subjected to oxidation blowing-vacuum rectification treatment to produce crude silver alloy;
b, adding the crude silver alloy into a silver separating furnace, blowing compressed air at the temperature of 1000-1100 ℃ to perform insertion blowing to remove impurities, and stopping blowing operation after observing that no obvious smoke exists on the surface of crude silver molten liquid and the surface is shiny;
c, adding a slag former into the crude silver melt, simultaneously carrying out insertion blowing, stopping insertion blowing after observing that the scum on the surface of the melt is completely covered, and removing solid oxide slag formed by slag formation of oxide on the surface of the alloy melt;
d, adding a copper removing agent into the alloy melt in the step c to perform oxidation copper removal;
and e, oxidizing and removing copper in the step d to obtain copper-removed slag, wherein copper in the copper-removed slag enters a liquid phase in a copper sulfate form through a pressurizing and acid leaching process, and is subjected to acid-base neutralization to obtain crude copper slag, and the noble metals gold and silver are left in the slag to return to a silver separating furnace for smelting treatment.
2. The method for improving gold and silver recovery rate by fire refining copper removal of crude silver according to claim 1, wherein the crude silver alloy in the step a contains 0.4-0.6% of gold, 42-50% of silver, 12-16% of copper and 15-20% of antimony.
3. The method for improving the recovery rate of gold and silver by refining copper by using a crude silver fire method according to claim 1 or 2, wherein compressed air is used for the insert blowing in the step b, and an air pipe is inserted 20cm below the liquid surface.
4. The method for improving the recovery rate of gold and silver by refining copper removal through crude silver fire method according to claim 1 or 2, wherein the slag former in the step c is sodium carbonate and saltpeter, and the adding proportion is as follows: soda ash: niter = 100: 3-5:1-2.
5. The method for improving gold and silver recovery rate by fire refining copper removal of crude silver according to claim 1 or 2, wherein the copper removal agent in the step d is iron red, and the addition amount is iron copper mole ratio 2:5, adding in three batches according to the mass ratio of 4:3:3, wherein the time interval between each addition is 1-2 hours, so that the reaction can be fully performed.
6. The method for improving the recovery rate of gold and silver by fire refining copper removal of crude silver according to claim 1 or 2, wherein the pressurizing and acid leaching pressure in the step e is 0.6Mpa, the sulfuric acid concentration is 3mol/L, and the liquid-solid ratio is 5:1, leaching temperature is 60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310830627.9A CN116814956A (en) | 2023-07-07 | 2023-07-07 | Method for improving gold and silver recovery rate by coarse silver fire refining copper removal |
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| CN202310830627.9A CN116814956A (en) | 2023-07-07 | 2023-07-07 | Method for improving gold and silver recovery rate by coarse silver fire refining copper removal |
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| Country | Link |
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- 2023-07-07 CN CN202310830627.9A patent/CN116814956A/en active Pending
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