RO125168A0 - Process for recovering gold and silver - Google Patents
Process for recovering gold and silver Download PDFInfo
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- RO125168A0 RO125168A0 ROA200900647A RO200900647A RO125168A0 RO 125168 A0 RO125168 A0 RO 125168A0 RO A200900647 A ROA200900647 A RO A200900647A RO 200900647 A RO200900647 A RO 200900647A RO 125168 A0 RO125168 A0 RO 125168A0
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- Prior art keywords
- gold
- copper
- silver
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- electrolysis
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- 239000010931 gold Substances 0.000 title claims abstract description 46
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 34
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 29
- 239000004332 silver Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 18
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 12
- 239000012141 concentrate Substances 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims abstract description 7
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 5
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims abstract description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 4
- 239000010935 stainless steel Substances 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 4
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 3
- 239000004133 Sodium thiosulphate Substances 0.000 claims abstract 3
- 150000001879 copper Chemical class 0.000 claims abstract 2
- PQTCMBYFWMFIGM-UHFFFAOYSA-N gold silver Chemical compound [Ag].[Au] PQTCMBYFWMFIGM-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000002994 raw material Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 239000012190 activator Substances 0.000 claims 1
- 239000000908 ammonium hydroxide Substances 0.000 claims 1
- 239000000284 extract Substances 0.000 claims 1
- 238000005065 mining Methods 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 19
- 238000007670 refining Methods 0.000 abstract description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 abstract description 4
- 239000011028 pyrite Substances 0.000 abstract description 4
- 229910052683 pyrite Inorganic materials 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 3
- 230000007928 solubilization Effects 0.000 abstract description 3
- 238000005063 solubilization Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 abstract description 2
- 239000010439 graphite Substances 0.000 abstract description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- 230000003381 solubilizing effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- PODWXQQNRWNDGD-UHFFFAOYSA-L sodium thiosulfate pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].[O-]S([S-])(=O)=O PODWXQQNRWNDGD-UHFFFAOYSA-L 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 238000000605 extraction Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical class [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229920001429 chelating resin Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
PROCEDEU DE OBȚINERE A AURULUI SI A ARGINTULUIPROCESS FOR OBTAINING GOLD AND SILVER
Invenția de fată se referă la un procedeu de obținere a aurului si a argintului din minereuri, concentrate piritoase, sterile si cenuși pe cale chimică, utilizând ca reactiv o soluție de tiosulfat de sodiu in mediu alcalin și catalizator o soluție amoniacala de cupru , respectiv separarea lor din soluție pe cale electrochimica și recircularea reactivilor in procesul de solvire.The present invention relates to a process for obtaining gold and silver from ores, pyrite concentrates, sterile and ash by chemical means, using as reagent a solution of sodium thiosulfate in alkaline medium and catalyst a copper ammonia solution, respectively the separation their solution from the electrochemical solution and the recirculation of the reagents in the dissolution process.
Sunt cunoscute procedee de obținere a aurului și a argintului prin solubilizare în soluții de tiosulfați alcalini a minereurilor și a concentratelor piritoase printr-o oxidare prealabilă sub presiune de oxigen in mediu alcalin sau acid, prin reacții biochimice, oxidare cu clor sau clorați; respectiv, extragerea din soluție cu schimbători de ioni, cărbuni activi sau precipitare cu sulfuri alcaline. Obținerea metalelor se realizeazâ printr-o topire alcalino-reducatoare complectată cu o rafinare electrochimica.Processes for obtaining gold and silver are known by solubilizing in alkaline thiosulphate solutions of ores and pyrite concentrates by pre-oxidation under pressure of oxygen in an alkaline or acid medium, by biochemical reactions, oxidation with chlorine or chlorates; respectively, extraction from the solution with ion exchangers, activated carbons or alkaline sulfide precipitation. The metals are obtained by an alkaline-reducing smelting completed with an electrochemical refining.
De exemplu : în brevetul Canadian 2209559/2001, minereul cu 6ppm Au se oxidează in mediu alcalin în autoclave sub o presiune de oxigen la 210-225 C. Suspensia obținută este alcalinizată la pH 9 cu o soluție de amoniac și supusă extracției cu o soluție de 14.7 g/1 tiosulfat si 1 g / 1 cupru.For example: in Canadian patent 2209559/2001, 6ppm Au ore is oxidized in an alkaline medium in an autoclave under an oxygen pressure of 210-225 C. The suspension obtained is alkalized at pH 9 with an ammonia solution and subjected to extraction with a solution. of 14.7 g / 1 thiosulfate and 1 g / 1 copper.
Aurul și argintul este solubilizat la un randament de 80% si separat prin cementare cu zinc, aluminiu sau cupru.Gold and silver are solubilized at an 80% yield and separated by cementation with zinc, aluminum or copper.
Obținerea metalelor pure din cement se realizează prin procedee clasice hidro si pirometalurgice.Obtaining pure metals from cement is done by classic hydro and pyrometallurgical processes.
In brevetul US 2003/0051581, solubilizarea aurului se realizează cu o soluție 0.1 M de tiosulfat de amoniu și 500 mg/1 ioni de cupru bivalent. Extracția sa din soluția de tiosulfat se obține prin absorbție pe rășini schimbătoare de ioni de tipul amberlite IRA 93 sau IRA 410, când aurul se concentrează la 9kg/t de rășina.In US Pat. Its extraction from the thiosulphate solution is obtained by absorption on ion exchange resins of the amberlite type IRA 93 or IRA 410, when the gold is concentrated at 9 kg / t of the resin.
In brevetul WO 2007/098603, solubilizarea unui minereu cu 17g/tAu se realizează cu o soluție de tiosulfat de amoniu 0.2 M si Cu SO/5HU 300 mg/1 si ΝΗΌΗ 0.9 M cu o durata de 24 ore, la un randament de 90.7%.In WO 2007/098603, the solubilization of an ore with 17 g / tAu is carried out with a solution of 0.2 M ammonium thiosulphate and with SO / 5HU 300 mg / 1 and ΝΗΌΗ 0.9 M with a duration of 24 hours, at a yield of 90.7 %.
Aurul solvit este reținut pe rășina schimbătoare de ioni Dowex 21 K iar consumul de tiosulfat de amoniu este de 17.8 kg/ tona de minereu.The dissolved gold is retained on the Dowex 21 K ion exchange resin and the consumption of ammonium thiosulphate is 17.8 kg / ton of ore.
Aceste procedee prezintă următoarele dezavantaje :These processes have the following disadvantages:
pRCiUL DE STAT PENTRU IWENȚii Ș! MARC! | Cerere de brevet de invenție j Nr ^>009STATE PRICE FOR IWENTS AND! MARC! | Patent Application No. No. 009
1 * x ra h 2 ti m tî n <s ii ta b ή λ ί ij a n li a π 3 u a □ η o n b u a a a s a a a □1 * x ra h 2 ti m tî n <s ii ta b ή λ ί ij a n li a π 3 u a □ η o n b u a a a s a a a □
I Dara depozit 2 0-08-2009I Dara deposit 2 0-08-2009
-2009-00647-2 0 -08- 2009-2009-00647-2 0 -08- 2009
- Supun in prima fază minereul sau concentratul piritos la o oxidare în autoclave la presiuni și temperaturi în medii alcaline sau acide- In the first phase, the ore or pyritic concentrate is subjected to autoclaving at pressures and temperatures in alkaline or acidic environments.
- Utilizează materii prime relativ bogate în aur (6ppm )- Uses relatively rich raw materials in gold (6ppm)
- Soluția de tiosulfat utilizată la extracția aurului și a argintului nu este recirculata in proces, devenind astfel o soluție reziduala- The thiosulphate solution used to extract gold and silver is not recirculated in the process, thus becoming a residual solution
- Se realizează o concentrare scăzută a aurului în produsul finit ( 9 kg/t rășină )- A low concentration of gold is achieved in the finished product (9 kg / t resin)
Problema tehnica pe care isi propune să o rezolve prezenta invenție este valorificarea materiilor prime sărace cu conținuturi de minim lppm Au + Ag și recircularea in sisțem a principalilor reactivi utilizați la solubilizarea aurului și a argintului, respectiv obținerea acestor metale în stare pura.The technical problem that the present invention aims to solve is the recovery of poor raw materials with contents of minimum lppm Au + Ag and the recirculation in the system of the main reagents used to solubilize gold and silver, respectively obtaining these metals in pure state.
Soluția problemei tehnice menționate consta în tratarea materiilor prime cu minim lppm Au + Ag sub agitare cu o soluție rezultata la operația de separare electrochimică a aurului, argintului și a cuprului, ce conține : 125 g/1 Na .S cO^ , 0.3 g/1 Cu , ,.The solution of the mentioned technical problem consisted in treating the raw materials with minimum lppm Au + Ag under stirring with a solution resulting from the operation of electrochemical separation of gold, silver and copper, containing: 125 g / 1 Na .S cO ^, 0.3 g / 1 Cu,,.
g/1 Na OH, 50 g/1 (NH^SC^, 1 g /1 NH;; corectata la: 8 g/1 Cu ‘ si 3 g/1 NH? (pH 10) la un raport solid/lichid de 1 : 1 - 1:2, timp de 2-4 ore, la temperatura de 15 — 25°C. După filtrarea suspensiei rezultă un reziduu care, in lipsa metalelor comune, poate fi utilizat ca material de umplutura in construcții sau in caz contrar ca o materie primă pentru valorificarea acestora. Soluția rezultată după extracție, după o prealabilă recirculare având un minim de 5ppm Au + Ag este supusă extracției electrochimice cu o depunere la catod a unui aliaj de cupru ce conține 3Q00- 10000 ppm Au si 10000-70000 ppmAg.g / 1 Na OH, 50 g / l (NH 2 SC 2, 1 g / l NH ;; corrected to: 8 g / l Cu 'and 3 g / l NH ? 1: 1 - 1: 2, for 2-4 hours, at a temperature of 15 - 25 ° C. After filtering the suspension a residue results which, in the absence of base metals, can be used as a filler in construction or otherwise as a raw material for their recovery The solution resulting after extraction, after a preliminary recirculation with a minimum of 5ppm Au + Ag is subjected to electrochemical extraction with a cathode deposition of a copper alloy containing 3Q00-10000 ppm Au and 10000-70000 ppmAg.
Soluția rezultată după operația de electroliză alcalină cu lppm Au + Ag și 0.2 g/1 Cu2'este corectată la valorile inițiale și recirculată la operația de dizolvare a aurului și a argintului. Aliajul de cupru și metale prețioase depus pe catodul din oțel inoxidabil este supus unei operații de rafinare electrochimică acidă astfel: anod - electrodul inoxidabil cu aliaj Cu + Au + Ag supus purificării, catod — o foaie de cupru : electrolit - soluție acidă de sulfat de cupru avand 35-45^/ Cu, 140-160 g/1 H^SOj, temperatura de 55-65 C, densitate de curent 150-250A/dmf După realizarea operației de purificare acidă, cuprul din aliajul anodului se depune pe catod cu un randament de 85-95 % la o puritate de 99.5-99.7% Cu, iar aurul și argintul se separa pe fundul celulei sub forma unui nămol cu un continui de 3-6% Au si 6-10% Ag. Nămolul este recoltat periodic, filtrat, spălat cu apa si uscat la 105 JC.The solution resulting from the alkaline electrolysis operation with lppm Au + Ag and 0.2 g / 1 Cu 2 'is corrected to the initial values and recirculated to the gold and silver dissolution operation. The alloy of copper and precious metals deposited on the stainless steel cathode is subjected to an acid electrochemical refining operation as follows: anode - stainless electrode with Cu + Au + Ag alloy subjected to purification, cathode - a copper foil: electrolyte - acid sulfate solution copper having 35-45 ^ / Cu, 140-160 g / 1 H ^ SOj, temperature 55-65 C, current density 150-250A / dmf After performing the acid purification operation, the copper in the anode alloy is deposited on the cathode with a yield of 85-95% at a purity of 99.5-99.7% Cu, and gold and silver separate on the bottom of the cell in the form of a sludge with a continuous of 3-6% Au and 6-10% Ag. The sludge is periodically harvested, filtered, washed with water and dried at 105 ° C.
Prelucrarea nămolului “ bogat “ în vederea obținerii aliajuluiProcessing of "rich" sludge in order to obtain the alloy
a - 2 0 0 9 - 0 0 6 4 7 2 0 -08- 2009a - 2 0 0 9 - 0 0 6 4 7 2 0 -08- 2009
Au-Ag (aliaj dore ) este cea clasica prin topire alcalină, iar rafinarea la metal pur se face pe cale electrochimică obtinandu-se aur si argint la purități de 99.9%.Au-Ag (dore alloy) is the classic one by alkaline melting, and the refining to pure metal is done by electrochemical way obtaining gold and silver at purities of 99.9%.
Reacțiile ce au loc in proces sunt următoarele :The reactions that take place in the process are the following:
z-z-
1. /202--/2 O + 2e1. / 202 - / 2 O + 2e
2. Cu(NH^ + 2 H^O + e ----Cu (NH^ +2NH^OH2. Cu (NH 2 + 2 H 2 O + e ---- Cu (NH 2 + 2 NH 2 OH)
3. + 2 S^Oy + 2 H>O ---Cu(S·^ + 2 NI^OH3. + 2 S ^ Oy + 2 H> O --- Cu (S · ^ + 2 NI ^ OH
4. Cu(S2Oj)^, +Au ---------** Au^O^ + Cu4. Cu (S 2 Oj) ^, + Au --------- ** Au ^ O ^ + Cu
- 2 -- 2 -
5. Au(S^O5)^ - e--** Au + (S^q)^5. Au (S ^ O 5 ) ^ - e - ** Au + (S ^ q) ^
- z-- z-
6. Cu(S^ - e -------Cu - (Ș^6. Cu (S ^ - e ------- Cu - (Ș ^
Se dau in continuare 2(doua)exemple de realizare a invenției:The following are 2 (two) embodiments of the invention:
Exemplul 1 .Example 1.
Intr-un reactor confecționat din OL 39 de 4 mc prevăzut cu agitator, se introduc 3 mc soluție provenită de la o electroliză alcalină sau din recirculare ce conțin : 0.3- 5 g/1 Cu, 50 g/1 (NE^^SO^ 7 g/1 NaOH 1.5-3.0 g/1 NH^OH , 100-120g/l Na^S/^H/); se corectează' la 8g/lCu, 125 g/1 si 3 g/1 NI^OH și 2000 kg minereu silicios cu un continui de 1.4ppmAu si 13.8ppmAg. Suspensia se agită 4 ore cu o barbotare de aer de 1.5mc/oră și se filtrează pe un filtru rotativ sub vid. Nămolul rezultat (2000 kg) este spălat cu 0.2 mc apă, formând un reziduu cuarțos lipsit de impurități toxice. Soluția filtrată este corectată cu NH^-OH la pH9-10, recirculată la operația de solvire a minereului silicios până la obținerea unui conținut de minim 5mg/l Au; după care este supusă unei electrolize cu anozi din otel inalt aliat la o densitate de curent de 1.0-1.5 A/dm . Electroliza se consideră terminată, atunci când concentrația in aur a electrolitului nu depășește 1 mg/1..In a reactor made of 4 m3 OL 39 equipped with a stirrer, 3 m3 of solution from an alkaline electrolysis or from recirculation containing: 0.3-5 g / l Cu, 50 g / l (NE ^^ SO ^ 7 g / l NaOH 1.5-3.0 g / l NH 2 OH, 100-120 g / l Na 2 S / H / L); it is corrected to 8 g / lCu, 125 g / l and 3 g / l NI ^ OH and 2000 kg siliceous ore with a continuous of 1.4ppmAu and 13.8ppmAg. The suspension is stirred for 4 hours with an air bubble of 1.5 m3 / hour and filtered on a rotary filter under vacuum. The resulting sludge (2000 kg) is washed with 0.2 m3 of water, forming a quartz residue free of toxic impurities. The filtered solution is corrected with NH 2 -OH at pH 9-10, recirculated during the operation of dissolving the siliceous ore until a content of at least 5 mg / l Au is obtained; after which it is subjected to electrolysis with high alloy steel anodes at a current density of 1.0-1.5 A / dm. Electrolysis is considered complete when the gold concentration of the electrolyte does not exceed 1 mg / l.
După un număr de cca 10 cicluri de electroliză, catodul cu depunerea de cupru, aur si argint este supus unei noi operatii de rafinare electrochimică. Parametrii operației de rafinare sunt: catod - foaie de cupru, anod - otel inalt aliat cu depunerea de cupru,After a number of about 10 cycles of electrolysis, the cathode with the deposition of copper, gold and silver is subjected to a new operation of electrochemical refining. The parameters of the refining operation are: cathode - copper foil, anode - high steel alloyed with copper deposition,
0 9 - 0 0 6 4 7 —0 9 - 0 0 6 4 7 -
0 -08- 2009 aur si argint. Electrolit - soluție acida de sulfat de cupru (40 g/1 Cu, 150 g/1 HjSO^). Densitate de curent 200 A/m2.Temperatura 60C.0 -08- 2009 gold and silver. Electrolyte - acid solution of copper sulfate (40 g / 1 Cu, 150 g / 1 HjSO ^). Current density 200 A / m 2. Temperature 60C.
Operația durează 30-50 ore și este terminata când anodul ramăne practic fără depunerile metalice. Nămolul căzut in baia de electroliză este colectat după parcurgerea a 10 cicluri de electroliză, este filtrat sub vid si spălat cu apă. După uscare este amestecat cu carbonat de sodiu si cărbune la un raport de 1:3 : 0.5 și topit intr-un creuzet de grafit la o temperatură de 1200¾. Aliajul Au-Ag (aliaj dore) separat este turnat sub formă de anozi și supus unor operații clasice de rafinare electrochimică si termică pentru obținerea aurului și a argintului in stare pură.The operation lasts 30-50 hours and is completed when the anode is practically free of metal deposits. The sludge falling into the electrolysis bath is collected after 10 cycles of electrolysis, filtered under vacuum and washed with water. After drying it is mixed with sodium carbonate and coal at a ratio of 1: 3: 0.5 and melted in a graphite crucible at a temperature of 1200¾. The separate Au-Ag alloy is cast in the form of anodes and subjected to classic electrochemical and thermal refining operations to obtain pure gold and silver.
Randamentul global al operației, minereu-metal pur este de 74% pentru aur si 72% pentru argint.The overall yield of the pure metal ore operation is 74% for gold and 72% for silver.
Exemplul 2.Example 2.
Operațiile decurg identic ca la exemplul 1 cu diferența că materia primă este un concentrat piritos cu lOppmAu si 40ppmAg.The operations are the same as in Example 1 with the difference that the raw material is a pyritic concentrate with lOppmAu and 40ppmAg.
Randamentul global minereu-metal pur in acest caz este de 86.1% pentru aur si 80.5% pentru argint.The overall pure ore-metal yield in this case is 86.1% for gold and 80.5% for silver.
Procedeul de extracție a aurului și a argintului nu este toxic, nu generează ape reziduale sau emanații de gaze toxice.The gold and silver extraction process is non-toxic, does not generate wastewater or toxic gas emissions.
Procedeul are aplicabilitate la obținerea aurului si a argintului din minereuri sărace și concentrate piritoase refractare la extracția cu cianuri alcaline, realizând randamente superioare în aceste cazuri si asigură recircularea reactivilor în procesul de solubilizare a materiei prime.The process is applicable to obtaining gold and silver from poor ores and pyritic concentrates refractory to alkaline cyanide extraction, achieving higher yields in these cases and ensures the recirculation of reagents in the process of solubilization of the raw material.
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| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
| US11578386B2 (en) | 2020-08-18 | 2023-02-14 | Enviro Metals, LLC | Metal refinement |
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