CN1268580A - Noble metal smelting slag wet metallurgical process - Google Patents
Noble metal smelting slag wet metallurgical process Download PDFInfo
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- CN1268580A CN1268580A CN00101543A CN00101543A CN1268580A CN 1268580 A CN1268580 A CN 1268580A CN 00101543 A CN00101543 A CN 00101543A CN 00101543 A CN00101543 A CN 00101543A CN 1268580 A CN1268580 A CN 1268580A
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- 239000002893 slag Substances 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 35
- 229910000510 noble metal Inorganic materials 0.000 title description 3
- 238000010310 metallurgical process Methods 0.000 title 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 87
- 229910052709 silver Inorganic materials 0.000 claims abstract description 87
- 239000004332 silver Substances 0.000 claims abstract description 86
- 239000010931 gold Substances 0.000 claims abstract description 70
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910052737 gold Inorganic materials 0.000 claims abstract description 69
- 238000002386 leaching Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 53
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010949 copper Substances 0.000 claims abstract description 23
- 239000011133 lead Substances 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(III) nitrate Inorganic materials [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910021538 borax Inorganic materials 0.000 claims abstract description 15
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 15
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 239000010970 precious metal Substances 0.000 claims description 14
- 238000005660 chlorination reaction Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000009854 hydrometallurgy Methods 0.000 claims description 6
- 239000012046 mixed solvent Substances 0.000 claims description 5
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 3
- 230000001698 pyrogenic effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 claims 2
- 238000007654 immersion Methods 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 229910001923 silver oxide Inorganic materials 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 13
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 239000000706 filtrate Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000010953 base metal Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- PQTCMBYFWMFIGM-UHFFFAOYSA-N gold silver Chemical compound [Ag].[Au] PQTCMBYFWMFIGM-UHFFFAOYSA-N 0.000 description 1
- IZLAVFWQHMDDGK-UHFFFAOYSA-N gold(1+);cyanide Chemical compound [Au+].N#[C-] IZLAVFWQHMDDGK-UHFFFAOYSA-N 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
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- 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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Abstract
The present invention uses different reagents and according to definite sequence to selectively extract gold, silver,copper, lead and borax from gold and silver smelting slag and smoke dust. It is characterized by that the raw material is ground and impregnated in water to recover borax, then use dilute sulfuric acid to leach out and recover copper, use nitric acid-ferric nitrate to leach out and recover silver and lead; then use any existent method to recover gold from slag. The leaching process is proceeded under normal temp..
Description
The method is a chemical metallurgy method for recovering gold, silver, copper, lead and borax fluxes from smelting slag (commonly called as 'borax slag') and smoke dust produced in the gold and silver smelting process. In the high-temperature smelting of gold and silver, borax, soda ash, silicon dioxide, fluorite and the like are almost used as slagging fluxes without exception to produce precious metal smelting slag and smoke dust, the main components of the slagging fluxes are decomposition products of the fluxes, base metals such as oxides of copper, lead, zinc, iron and the like, and matte (the main component is Cu)2S, FeS), and the precious metals gold and silver lost to them due to mechanical impurities. The content of gold and silver in the slag materials fluctuates greatly and is different from several grams to several kilograms per ton, and most of gold and silver exist in the form of silver-gold alloy or alloy formed by the silver and the base metal copper and lead, which causes difficulty for the conventional hydrometallurgy process (such as cyaniding).
For many years, the slag materials are treated by a classical fire process at home and abroad, namely, the slag materials are remelted, molten lead is used as a gold and silver collecting agent, noble lead enriched with gold and silver is obtained through smelting, then the noble lead is subjected to oxidation refining, namely ash blowing operation, and gold and silver are separated and recovered from gold and silver alloy obtained through ash blowing (see south Africa gold metallurgy). The process produces a large amount of lead smoke, seriously pollutes the environment, damages the health of operators, has long production period, causes secondary loss of gold and silver (loss in cupel materials) in the ash blowing process, reduces the direct recovery rate, consumes more fuel and is difficult to recover the added lead.
In addition, according to the gold reported in 1994, 1 st, some foreign factories use fine grinding of slag, mercury mixing, and then return to the cyanidation process. The smelting slag is treated by adopting a gravity separation method, and the defects that the recovery rate of gold and silver is low, particularly, a large amount of silver is difficult to recover, and the obtained gravity separation product is an intermediate product and still needs to be further treated by a smelting plant.
Because gold and silver are mostly present in an alloy state, generally, the ratio of silver to gold in the materials is not less than 10: 1, so that the materials cannot be directly treated by the existing hydrometallurgical processes such as cyanidation, aqueous solution chlorination and the like.
The invention aims to provide a continuously operated hydrometallurgical process for selectively recovering gold, silver, copper, lead and borax fluxes from precious metal smelting slag and smoke dust in a certain sequence, and the process has high gold and silver recovery rate.
It is another object of the present invention to provide a process for recovering silver from a silver-containing material.
The present invention relates to a new hydrometallurgical process for recovering gold, silver, copper, lead and borax fluxing agent from noble metal smelting slag and smoke dust. In this process, gold, silver, copper, lead and borax are selectively extracted in a certain order by different reagents. The method is characterized in that smelting slag is firstly crushed and ground, then is leached by water, and borax is recovered from a solution; leaching the water leaching residue with dilute sulfuric acid, and recovering copper from the solution; the acid leaching residue is leached out silver by nitric acid-ferric nitrate, which can ensure high yield of gold and silver, which is difficult to be realized by the prior art. And finally, treating the silver separating residue enriched with gold by using the existing gold extraction method, and recovering the gold in the silver separating residue. The whole process consists of the following procedures:
1. crushing, grinding and sieving the smelting slag, wherein the grinding fineness is less than 20 meshes, preferably 60 to 120 meshes, namely the grain diameter is less than 0.9 mm, preferably 0.28 to 0.125 mm.
2. And (5) soaking in water. And (3) leaching the qualified material by stirring with water at normal temperature, wherein the liquid-solid ratio is 3-5: 1, the time is 1 hour,liquid-solid separation is carried out after leaching is finished, borax flux is recovered from the solution, and the water leaching residue enters an acid leaching process.
3. And (4) leaching with dilute acid. Leaching the water leaching residue at normal temperature by stirring with dilute sulfuric acid with concentration of 10-20 wt% to remove most of acid soluble substances and recover copper in the raw material; further enriching gold and silver. The leaching time is 1-2 hours, the liquid-solid separation is finished after the leaching, copper is recovered from the solution, and the acid leaching residue is treated by a silver separation process.
4. And (4) leaching silver. Leaching the acid leaching residue with a mixed solvent of nitric acid and ferric nitrate to obtain silver and HNO at normal temperature3Concentration of (2) - (15%), Fe (NO)3)3The concentration of the silver is 2-10 percent, the time is 1-2 hours, after the leaching is finished, liquid-solid separation is carried out, silver and lead are recovered from the solution, and the silver leaching residue is sent to the gold recovery process.
5. And (6) recovering gold. The gold in the silver leaching residue can be recovered by any conventional method. The existing method for recovering gold comprises the following steps: 5.1 cyanidation; 5.2 chlorination methods, including aqueous solution chlorination method and chlorination volatilization method; 5.3 aqua regia dissolving-reducing method; 5.4 pyrogenic lead enrichment.
The attached drawing is a process flow chart for treating the smelting slag and the smoke dust produced in the smelting process in the precious metal smelting process.
The invention is described in detail with reference to the attached figures and specific examples. The results of treating gold and silver smelting slag are described below, but the process can also be used for treating the smoke produced in the precious metal smelting process, and other silver-containing materials containing natural silver or silver alloys.
The raw material used in the method of the invention is typical borax-silicon oxide binary system smelting slag which contains Au, Ag, Cu, Pb, Fe and SiO2、B2O3、Na2O, and the like. In the gold cyanide mud smelting processThe alloy gold smelting slag and the crude silver smelting slag are produced, the alloy gold smelting slag and the crude silver smelting slag are preferably mixed, melted and precipitated to obtain a small amount of gold and silver, and the operation is called 'slag returning' operation to reduce the grade of the gold and the silver in the slag.
It has been found that by the method of the invention, finely ground raw materials can be leached with water and dilute acid at ambient temperature to remove more than 90% of impurities, even up to 97%, to which gold and silver are greatly enriched, and the silver is leached with a mixed solvent to separate gold from silver, recovering silver from the solution, and the gold in the leached silver residue is recovered by any of the methods known in the art.
As shown in the attached drawing, the precious metal smelting slag is firstly crushed, and various ore crushing equipment such as jaw crushing can be selected; the grinding equipment can be ball mill, rod mill or gravel mill, and the grinding fineness is 20-120 meshes, namely the grain diameter is 0.125-0.9 mm. It is noted that, in the grinding, the particle size of the nonmetallic minerals becomes small, while the particle size of metals such as gold, silver and alloys thereof becomes large and flakes are formed, and therefore, the coarse particles of gold and silver in the slag can be recovered by a simple grinding and screening process. Tests prove that after the 20-mesh sieve is subjected to water leaching and acid leaching, about 63 percent of the-200-mesh sieve is used, so that the subsequent gold and silver leaching is facilitated.
The screened fine materials are stirred and leached by water at normal temperature, the liquid-solid ratio is 3-5: 1, the time is 1 hour, the leaching is finished, the fine materials are filtered in a centrifuge, the filtrate is further processed to produce borax fluxing agent, and the borax fluxing agent can be directly used as fluxing agent for smelting noble metals or sold as products. In the process, most of the water soluble matters in the raw materials are dissolved, the precious metals of gold and silver and the valuable metals of copper and lead are enriched for the first time, and the water leaching slag is about 20-30% of the raw materials.
It is known that the base metal oxides and copper matte in the slag can be dissolved out with various mineral acids, where sulfuric acid is used, which has the advantage of being very cheap and even directly using the low-concentration waste acid discharged from the acid plant of the nonferrous smelting plant. The dilute sulphuric acid leaching aims to remove most acid-soluble impurities, including copper matte, destroy the original structure, fully dissociate gold and silver and recover copper. The acid leaching slag is about 3-7% of the raw material, gold and silver are enriched for the second time, and the subsequent material processing amount and workload are greatly reduced. In order to accelerate the reaction speed and improve the leaching rate of copper during acid leaching, ammonium nitrate can be added into the leaching solution, and the concentration of the ammonium nitrate is not lower than 30 g/L. Leaching with 10-20% sulfuric acid at a liquid-solid ratio of 3-6: 1, mechanically stirring at normal temperature for 1-2 hr, filtering, recovering copper from the filtrate, and treating the acid leaching residue in silver separating process. It is worth noting that when dilute acid is leached, the silicon oxide in the raw material can be partially dissolved to generate silicic acid, and the silicon oxide is in a colloid state along with the increase of the pH value of the solution, so that slurry is thickened, and the filtration is influenced. During leaching, the concentration of acid is controlled to ensure that the silicon oxide is dissolved out as little as possible and prevent colloidal slurry. The optimum concentration of sulfuric acid in the leachate, particularly the solid content and the content of various impurities in the ore pulp, is determined by ensuring the theoretical amount of sulfuric acid which is excessive and is required for reacting with various compounds and metal impurities in the raw materials.
After the acid leaching is finished, the filter residue is stirred at normal temperature by nitric acid-ferric nitrate to leach silver. As mentioned above, silver in the slag forms an alloy with gold, copper and lead, so that the effect of leaching silver with nitric acid alone is poor, while ferric nitrate is a good solvent for silver and can dissolve other base metal impurities, and the reaction formula is:
the added nitric acid also takes part in the reaction and can adjust the pH value of the solution to prevent the ferric iron from being hydrolyzed. The concentration of nitric acid is 2-15%, the concentration of ferric nitrate is 2-10%, liquid-solid ratio is 2-3: 1, leaching time is 1-2 hr, and silver leaching process can be implemented at normal temp., preferably at 50-80 deg.C. The mixed solvent of nitric acid and ferric nitrate can ensure high leaching rate of silver, which is unique to the process of the invention. And after leaching, liquid-solid separation is finished, silver and lead are recovered from the filtrate, and filter residue is sent to a gold extraction process for treatment.
The gold in the silver separating slag can be recovered by any conventional method. The existing method for recovering gold comprises the following steps: 1) a cyanidation process; 2) chlorination processes, including aqueous chlorination and chlorination volatilization; 3) aqua regia dissolving-reducing method; 4) pyrogenic lead enrichment.
And (4) selecting a proper solvent for secondary treatment to recover residual gold and silver from the residues after gold recovery according to the content of gold and silver. The final residue was discarded.
The process has the obvious advantages that according to the results of small tests, the leaching rate of gold can reach more than 98 percent, the leaching rate of silver can reach more than 96 percent, and higher leaching rate can be reached after repeated treatment; secondly, valuable components in the raw materials, such as borax, copper, lead and the like, can be comprehensively recovered; the process has the advantage of being more economical, and the method adopts step-by-step leaching to remove impurities, so that the processing ore amount of the precious metal raw material is reduced as much as possible, the dosage of the medicament is reduced, and the processing cost of the precious metal smelting slag raw material is greatly reduced.
The process of the present invention is illustrated in detail by the following examples, but the present invention is not limited thereto.
Example one
A sample of precious metal slag containing 156 g/ton gold and 1700 g/ton silver wascrushed by a jaw crusher, grinding in a rod mill, sieving through a 60 mesh sieve, in a test series consisting of 5 leaching processes, each sample is 500 g, the mixture is stirred and leached by water at normal temperature according to the weight ratio of 3: 1, the rotating speed of a stirrer is 360 revolutions per minute, the time is 1 hour, filtering after water leaching, leaching filter residue with 15% (weight) dilute sulfuric acid under stirring at normal temperature at 360 rpm with liquid-solid ratio of 6: 1 for 1 hr, filtering, washing, drying and weighing, calculating the acid leaching residue to be 3.2 percent of the raw material, leaching the silver of the acid leaching residue by using 5 percent nitric acid-8 percent ferric nitrate, wherein the liquid-solid ratio is 2: 1, the time is 2 hours, and finally, filtering and washing, recovering silver and lead from the filtrate, and enabling filter residues to enter a gold recovery process. Recovering gold from the gold by an aqueous solution chlorination method, wherein the operating conditions of the aqueous solution chlorination method are as follows: the dosage of sodium chlorate is 20 percent of the feeding amount, the liquid-solid ratio is 3: 1, the temperature is 85 to 90 ℃, the time is 4 hours, the concentration of hydrochloric acid is 3N, and the concentration of sodium chloride is 80 g/L. The following technical indexes are obtained: the gold leaching rate is 98.3 percent, and the silver leaching rate is 97.5 percent. And finally, carrying out secondary treatment on the residue to recover residual gold and silver, and then discarding the residual gold and silver.
Example two
The precious metal slag sample contained 35 g/ton gold and 387 g/ton silver, and the test procedure was the same as in example one. The concentration of sulfuric acid is 20 percent during acid leaching, the liquid-solid ratio is 4: 1, silver leaching residue is leached by 3 percent nitric acid-5 percent ferric nitrate, the liquid-solid ratio is 2: 1, the time is 1 hour, the leaching is finished, the filtration and the washing are finished, silver is recovered from filtrate, the silver leaching residue is heated and dissolved by 1: 1 (volume ratio) of dilute aqua regia, and the obtained technical indexes are as follows: the gold leaching rate is 99 percent, and the silver leaching rate is 98 percent.
Claims (9)
1. The hydrometallurgical process for recovering gold, silver, copper, lead and borax fluxes from precious metal smelting slag and smoke dust is characterized in that: 1.1 crushing, grinding and screening the smelting slag; 1.2, screen blanking, normal temperature water leaching and filtering, and producing borax fluxing agent from the solution; 1.3 leaching and filtering dilute sulphuric acid at normal temperature, and recovering copper from the solution; 1.4 leaching the acid leaching residue by using a mixed solvent of nitric acid and ferric nitrate at normal temperature, filtering, recovering silver and lead from the solution, and recovering gold from the 1.5 silver leaching residue by using any one of the existing methods.
2. As set forth in claim 1, the precious metal smelting slag is alloy gold smelting slag, crude silver smelting slag, or smelting slag, smoke dust, or other silver-containing materials produced by melting and mixing gold and silver.
3. As set forth in claim 2, the alloyed gold slag is preferably mixed and melted with the raw silver slag, and the resultant mixed slag is treated by the process of the present invention.
4. As set forth in claim 2, the silver in the silver-containing material is present in the form ofnatural silver, silver oxide or silver alloy.
5. As set forth in claim 1, the slag has a fineness of less than 0.9 mm, preferably from 0.125 to 0.28 mm.
6. As described in claim 1, the water immersion has a liquid-solid ratio of 3-5: 1.
7. The process of claim 1, wherein the dilute sulfuric acid leach is conducted at a liquor-to-solid ratio of 3-6: 1 and a sulfuric acid concentration of 10-20 wt%.
8. The method as defined in claim 1, wherein the concentration of nitric acid in the mixed solvent of nitric acid and ferric nitrate is 2-15%, the concentration of ferric nitrate is 2-10%, and the liquid-solid ratio is 1-2: 1.
9. As described in claim 1, the existing methods for gold recovery are: 9.1 cyanidation; 9.2 chlorination processes, including aqueous chlorination and chlorination volatilization; 9.3 aqua regia dissolving-reducing method; 9.4 pyrogenic lead enrichment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00101543A CN1132946C (en) | 2000-01-11 | 2000-01-11 | Noble metal smelting slag wet metallurgical process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00101543A CN1132946C (en) | 2000-01-11 | 2000-01-11 | Noble metal smelting slag wet metallurgical process |
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| Publication Number | Publication Date |
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| CN1268580A true CN1268580A (en) | 2000-10-04 |
| CN1132946C CN1132946C (en) | 2003-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN00101543A Expired - Fee Related CN1132946C (en) | 2000-01-11 | 2000-01-11 | Noble metal smelting slag wet metallurgical process |
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| Country | Link |
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| CN (1) | CN1132946C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942570A (en) * | 2010-08-27 | 2011-01-12 | 河南中原黄金冶炼厂有限责任公司 | Slag returning method for reducing gold content of smelting slag |
| CN101994011B (en) * | 2009-08-10 | 2012-11-14 | 北京有色金属研究总院 | Method for treating and refining copper, tin, zinc and lead-containing waste residues |
| CN103725892A (en) * | 2013-12-13 | 2014-04-16 | 金川集团股份有限公司 | Method for recycling valuable metals from precious smelting slag |
| CN107083486A (en) * | 2017-04-27 | 2017-08-22 | 永兴鑫裕环保镍业有限公司 | The joint disposal Application way of the waste residue containing precious metal smelting |
| CN109593969A (en) * | 2018-12-14 | 2019-04-09 | 许金刚 | A kind of molten gold process of no cyanogen |
| CN110724827A (en) * | 2019-10-23 | 2020-01-24 | 金川集团股份有限公司 | Method for enriching precious metals from sponge copper leaching residues |
| CN111235402A (en) * | 2020-01-19 | 2020-06-05 | 苏尼特金曦黄金矿业有限责任公司 | Method for recovering gold from gold smelting slag |
| RU2853424C1 (en) * | 2025-02-07 | 2025-12-23 | Акционерное общество "Полюс Красноярск" | Method of processing gold-containing slag |
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2000
- 2000-01-11 CN CN00101543A patent/CN1132946C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994011B (en) * | 2009-08-10 | 2012-11-14 | 北京有色金属研究总院 | Method for treating and refining copper, tin, zinc and lead-containing waste residues |
| CN101942570A (en) * | 2010-08-27 | 2011-01-12 | 河南中原黄金冶炼厂有限责任公司 | Slag returning method for reducing gold content of smelting slag |
| CN101942570B (en) * | 2010-08-27 | 2012-07-04 | 河南中原黄金冶炼厂有限责任公司 | Slag returning method for reducing gold content of smelting slag |
| CN103725892A (en) * | 2013-12-13 | 2014-04-16 | 金川集团股份有限公司 | Method for recycling valuable metals from precious smelting slag |
| CN103725892B (en) * | 2013-12-13 | 2015-08-05 | 金川集团股份有限公司 | A kind of method reclaiming valuable metal in your smelting slag rare |
| CN107083486A (en) * | 2017-04-27 | 2017-08-22 | 永兴鑫裕环保镍业有限公司 | The joint disposal Application way of the waste residue containing precious metal smelting |
| CN107083486B (en) * | 2017-04-27 | 2019-04-09 | 永兴鑫裕环保镍业有限公司 | Comprehensive disposal and utilization method of precious metal-containing smelting waste residue |
| CN109593969A (en) * | 2018-12-14 | 2019-04-09 | 许金刚 | A kind of molten gold process of no cyanogen |
| CN110724827A (en) * | 2019-10-23 | 2020-01-24 | 金川集团股份有限公司 | Method for enriching precious metals from sponge copper leaching residues |
| CN111235402A (en) * | 2020-01-19 | 2020-06-05 | 苏尼特金曦黄金矿业有限责任公司 | Method for recovering gold from gold smelting slag |
| RU2853424C1 (en) * | 2025-02-07 | 2025-12-23 | Акционерное общество "Полюс Красноярск" | Method of processing gold-containing slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1132946C (en) | 2003-12-31 |
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