CN101876005A - Method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method - Google Patents
Method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method Download PDFInfo
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Abstract
The invention relates to a method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method comprising two segments of pressurization oxidation preprocessing and pressurization oxidation aurum leaching. The method comprises the steps of: firstly, pressurizing and oxidizing base metal sulfide such as iron sulfide with sulfuric acid-iron sulfate, wherein most S2- and S22- are oxidized into elemental sulfur; and secondly, pressurizing and leaching the preprocessed slag with thiocyanate so that aurum is selectively dissolved in the solution in the form of aurum-thiocyanic acid compound. Therefore, the pre-oxidation slag can be directly leached without neutralization, the technical process is short, the aurum recovery rate is high, the cost is low and pollution of low-concentration SO2 smoke gas, As2O3 smoke dust, and the like is avoided.
Description
Technical field
The invention belongs to the non-ferrous metal wet method and extract metallurgy, be applicable to and from the refractory sulfide gold ore, extract gold.
Technical background
The difficult-treating gold mine reserves account for 30% of world's gold mine total reserves, and China accounts for more than 20%, and wherein treating refractory As-containing gold ore accounts for exhausted vast scale.Directly the cyaniding selectivity leaches Jin Shangwei successfully precedent, and to containing the arsenic golden ore concentrate hard to treat, its processing scheme is carried out oxidation pre-treatment basically earlier at present, and gold is leached in cyaniding again.The oxidation pre-treatment scheme has four kinds: chemical oxidization method, roasting method, pressure oxidation method and bacterial oxidation method.Biological Pretreatment-cyanide process (Yang Hongying, etc. oxidation with arsenic resistant strains preprocessing high-arsenic complex difficult-treating gold mine is grabbed cyaniding gold-extracting method, and CN 200810011233.6; High Jinchang, Deng. the biological dump leaching gold extraction technology of low-grade intractable gold mine, CN 200810050452.5) at first be the ore reduction that will contain gold mineral, granulate, build heap, carry out the acid treatment of ore then, utilize microorganism that ore is carried out biological pre-oxidation afterwards, carry out the normal pressure cyaniding after transition at soda acid and leach, carry out the recovery of gold at last.Advantage is low cost, less energy-consumption, but biological treatment speed is slow, needs after the mineral processing to be converted into alkalescence from acidity.Oxidizing roasting-cyanide process (Chen Liangzhong, Yang Zhengkun. the difficult-treating gold mine kiln oxidizing roasting is carried golden integral process, ZL 200610048718.3) the cyanidation gold-extracted processing of calcination process, normal pressure of refractory gold ore is all finished in same tunnel furnace, inevitably produce low concentration SO in the production process
2Flue gas with contain hypertoxic As
2O
3Flue dust, have shortcomings such as gold recovery is low in addition.Du Qin already waits and proposes to adopt oxygen to press pre-treatment-cyanide process (a kind of method that proposes gold and silver from indissoluble gold, silver preparation concentrate, ZL 03112127.6) from indissoluble gold, silver preparation concentrate, gold and silver are proposed, this method adds the solution of 69-253g sulfuric acid and NaCl0.01-0.08g/L earlier, leaches in groove and takes off CO in 3 hours
2The catalyzed oxidation acidleach is under the condition of 0.16-0.6MPa at temperature 96-106 ℃ oxygen pressure, adds after sulfuric acid, nitric acid, the wooden sodium sulfonate in autoclave acidleach 1-4 hour; Remaining elementary sulfur in the oxidation sludge adds entry, lime and wooden sodium sulfonate, under 80-100 ℃, oxygen pressure 0.1-0.4MPa, leaches desulfurization in 0.5-3 hour; Ore pulp adding NaCN after the press filtration, lime, oxygen leached 24-48 hour.This technology has mainly had problems, and for cyanidation gold-extracted, needs exhaustive oxidation S
2-Become SO
4 2-Puzzled S
x 2-(x 〉=2) enter solution, so technical process is long, equipment corrosion is severe.Their further bibliographical information (Li Xueqiang, etc. contain the research and the application of the difficult gold and silver concentrate catalyzed oxidation of arsenic acidleach wet method. modern mining industry, 2009, (1): 37-40) show, need to add HNO in the catalyzed oxidation acidleach process
35.5g/L more than, when making catalyzer with nitric acid, it participates in being reduced into NO, NO and O in the gas phase after the reaction
2Act on very fast generation NO
2Return and become HNO in the liquid phase
3, the principal reaction of generation is reduced to:
4FeS
2+15O
2+2H
2O＝2Fe
2(SO
4)
3+2H
2SO
4 (1)
2FeAsS+H
2SO
4+7O
2+2H
2O＝Fe
2(SO
4)
3+2H
3AsO
4 (2)
Though the NO that this technology adds
3 -Amount is than the NO of Arseno method
3 -The NO of 250g/L, Nitrox method
3 -The 70-110g/L of 250g/L and Redox method is few, but equally exist equipment corrosion serious, produce deleterious oxides of nitrogen gas.More than adopt cyanide process to leach gold, all need to adopt the sodium cyanide of severe toxicity, environmental issue is serious; In addition, handle in the sulphide ores pre-treatment slag process, if sulphur removes not exclusively in the preprocessing process, the sulphur remaining at alkaline condition can be oxidized to S
2O
3 2-Or and CN
-Reaction generates SCN
-, increase the consumption of prussiate.Ou Huabei (contains arsenic, the wet pretreatment of antimony refractory gold ore and do not have the cyanogen gold extracting method, ZL 200610008781.4) propose chlorination pre-treatment-thiosulfate technique and handle and contain arsenic, the antimony difficult-treating gold mine, employing is by chlorinated lime, sulfuric acid, hydrochloric acid or chlorine hydrochloric acid, hydrogen peroxide or perchloric acid, hydrochloric acid, hydrogen peroxide or hydrochloric acid, hydrogen peroxide mixes, and to contain reactive chlorine be that the mixing solutions of 1.5-10% is at 40-80 ℃, maturation process is more than 3 days under pH＜1 condition, the pre-treatment slag thiosulphate of 0.2-1.0mol, 0.4? the ammoniacal liquor of mol, 0.04? .1mol the ammoniac thiosulfate solution that sulphite and 0.4-1g cupric ion are made into is at pH value 9-11, under temperature 40-50 ℃, leached 8-20 hour, leach liquor charcoal absorption gold, this technology exists reagent consumption big, the shortcoming of muriate severe corrosion equipment.
Leach gold for the thiocyanate-normal temperature and pressure, (Thiocyanate solutions ingold technology.Hydrometallurgy such as A.G.Kholmogorov, 2002,64:43-48) the KSCN solution of employing 0.4mol/L, leach the golden mispickel concentrate that contains of chemical method preparation, leached 3-4 hour under pH value 2-5 condition, the leaching yield of gold is greater than 95%.(Leaching of gold in thiocyanate solutions, Part 2:redox processesin iron (III)-thiocyanate solutions.Transactions of the Institution of Mining﹠amp such as A.J.Monhemius; Metallurgy, Section C, 1994,103, pp.C111-C116) propose to adopt thiocyanate salt solution to leach gold, use Fe
3+Make oxygenant, in pH value 2? scope has higher leaching velocity and leaching yield, but SCN
-Oxidized and Fe
3+Be reduced into Fe
2+(Leaching of Dominican gold ores in iodide-catalysedthiocyanate solution.Transactions of the Institution of Mining and Metallurgy such as A.J.Monhemius, Section C, 1995,104, C117-C124) also propose to adopt iodine to make oxygenant and leach gold.Series of patents (Precious metal recovery using thiocyanate lixiviant.US 20080066577, the 2007-10-3 of Rong Yu Wan etc.; US 20080066578,2007-10-5; US 20040197249,2003-8-28) propose to adopt Biological Pretreatment, thiocyanate salt solution dump leaching method to handle gold-bearing sulfide ore.And adopt thiocyanate-oxygen to press to leach gold bibliographical information not as yet.
Summary of the invention
Mainly there is following shortcoming in the technology of the difficult gold sulphide concentrate of processing of bibliographical information at present, long flow path, the rate of recovery is low, reagent is hypertoxic, equipment corrosion is serious, we have proposed the sulfuric acid system pressurised oxygen and have soaked pre-treatment and remove base metals such as iron, thiocyanate-system pressurised oxygen leaches two sections pressurised oxygen method of soaking of gold and extracts golden technology from difficult gold sulphide concentrate, has flow process weak point, environmental friendliness, advantage that the rate of recovery is high.
The objective of the invention is to realize by following manner:
Two sections pressurised oxygen methods of soaking are extracted the method for gold from difficult gold sulphide concentrate, the mode that adopts the two-part pressurised oxygen to soak promptly is divided into pressurised oxygen and soaks pre-treatment and soak gold with pressurised oxygen and extract golden from difficult gold sulphide concentrate; First section pressurised oxygen soaked pre-treatment, adopting industrial sulphuric acid to add a preceding pressurised oxygen, to soak first section composite sulfuric acid-ferrum sulfuricum oxydatum solutum of filtrate of pretreated part be leaching agent, carry out pressure oxidation and leach, obtain first section filtrate of iron content and other foreign metal and contain the pre-treatment slag of elementary sulfur, Au; Second section pressurised oxygen soaked gold, then is the pre-treatment slag is soaked for the leaching agent pressurised oxygen with iron content ionic thiocyanate salt solution again, makes the form selective dissolution of Jin Yijin-thiocyanic acid title complex enter second section filtrate.
Is in described first section pressure oxidation leaching process: the leaching agent composition an iron content 1? 0g/L, SO
4 2-0.5? mol/L; Gold ore amount 80-350g/L adds the wooden sodium sulfonate account for gold ore weight 0.05-0.5%, and control oxygen is pressed 0.4-1.8Mpa, temperature 100-180 ℃, reacts solid-liquid separation again after the cooling 0.5-4.0 hour.
In described second section pressure oxidation leaching process: leaching agent is thiocyanate 0.05-5.0mol/L, iron ion 0-10g/L; Gold ore pre-treatment slag add-on 80-300g/L adds in the reactor and regulates the pH value to 1.0-5.0 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 100 ℃-180 ℃, and aerating oxygen is kept air pressure 0.4-2.0MPa in the reactor, reacts 1.0-6.0 hour; Gold is reclaimed in cooling back solid-liquid separation, washing again from leach liquor, the solution behind the recovery gold returns pressurised oxygen and soaks.
The present invention proposes base metal sulfide such as iron in the difficult gold sulphide concentrate of sulfuric acid system pressure oxidation and thiocyanate salt solution pressure oxidation and leach two sections pressurised oxygen of gold and soak method, from the refractory sulfide gold ore, extract gold.
Ultimate principle of the present invention is:
1) the sulfuric acid system pressurised oxygen is soaked the difficult gold sulphide concentrate of pre-treatment, the iron-containing liquor that adopts the preceding pressure oxidation golden ore concentrate hard to treat of returning part to obtain, make up water again, industrial sulphuric acid, an amount of wooden sodium sulfonate, base metal sulfides such as pressure oxidation iron, most of S
2-, S
2 2-Be oxidized to elementary sulfur.The generation principal reaction comprises:
4Fe
2++O
2+4H
+＝4Fe
3++2H
2O (3)
FeS
2+2Fe
3+＝3Fe
2++2S
0 (4)
FeAsS+5Fe
3++6H
2O＝6Fe
2++2H
3AsO
3+2S
0+6H
+ (5)
MeS+2Fe
3+＝Me
2++2Fe
2++S
0 (6)
Me represents zinc, copper, lead etc.By the preceding pre-treatment iron-containing liquor of returning part, can significantly improve speed of response, and make S
2-The product that oxidation obtains is an elementary sulfur, avoids the severe corrosive of catalyzer nitric acid simultaneously.If contain the carbonate of Ca, Mg in the difficult mineral, in reactor, stir under the normal pressure earlier and decompose, logical again oxygen.
2) thiocyanate-system pressure oxidation selectivity from refractory sulfide gold ore pre-treatment slag leaches gold, utilizes Au
+, Au
3+With SCN
-Can form very stable title complex Au (SCN)
2 -, Au (SCN)
2 +, Au (SCN)
4 -, oxygen, Fe
3+Make after the golden oxidation again and SCN in oxygenant
-Form stable title complex and enter solution.
4Au+8SCN
-+O
2+2H
2O＝4Au(SCN)
2 -+4OH
- (7)
4Au+8SCN
-+3O
2+6H
2O＝4Au(SCN)
2 -+12OH
- (8)
2Au
2S+8SCN
-+O
2+2H
2O＝4Au(SCN)
2 -+4OH
-+S
0 (9)
Au+2SCN
-+Fe
3+＝Au(SCN)
2 -+Fe
2+ (10)
The elementary sulfur that oxidation generates in the preprocessing process soaks the leaching yield that does not only influence gold in the golden process in the oxygen pressure, can also play and stablize leaching agent SCN
-Effect, because if there is not elementary sulfur, oxygen is pressed and to be soaked golden process following reaction can take place:
(SCN)
2+2e
-＝2SCN
- (11)
(SCN)
3 -+2e
-＝3SCN
- (12)
3(SCN)
2+4H
2O＝5SCN
-+HCN+7H
++SO
4 2- (13)
3(SCN)
3 -+4H
2O＝8SCN
-+HCN+7H
++SO
4 2- (14)
And the existence of elementary sulfur is arranged, following reaction can take place:
CN
-+S
0＝SCN
- (15)
3(SCN)
2+S
0+4H
2O＝6SCN
-+SO
4 2-+8H
+ (16)
Suppress and eliminate the decomposition reaction of thiocyanate ion.
The sulfuric acid system pressurised oxygen is soaked the difficult gold sulphide concentrate of pre-treatment, the technology condition that its first section pressurised oxygen soaked is: the preceding pressurised oxygen of returning part is soaked first section filtrate of iron content part that the pre-treatment golden ore concentrate hard to treat obtains, add industrial sulphuric acid, water, be made into iron content 1-30g/L, SO
4 2-0.5-3mol/L leaching agent, gold ore amount 80-350g/L adds the wooden sodium sulfonate of gold ore weight 0.05-0.5%, control oxygen is pressed 0.4-1.8Mpa, temperature 100-180 ℃, reacts solid-liquid separation again after the cooling 0.5-4.0 hour.First section filtrate reclaim(ed) sulfuric acid of partly opening a way is ferrous, and part is returned pressurised oxygen and soaked pretreatment process.
Second section thiocyanate-system pressurised oxygen leaches gold, is to be leaching agent with iron content ionic thiocyanate salt solution: contain cyanate 0.05-5.0mol/L, iron ion 0-10g/L; Gold ore pre-treatment slag add-on 80-300g/L adds and mixes the pH value is regulated in the back with industrial sulphuric acid or lime 1.0-5.0 in the reactor; The control temperature of reaction kettle is 100 ℃-180 ℃, and aerating oxygen is kept air pressure 0.4-2.0MPa in the reactor, reacts 1.0-6.0 hour; After the cooling, solid-liquid separation, washing are reclaimed gold with iron replacement, charcoal absorption or extraction process again from leach liquor.Solution behind the recovery gold returns pressurised oxygen and soaks gold.
The present invention adopts two sections pressurised oxygen method of soaking to extract gold from the refractory sulfide gold ore, and the purpose that adopts thiocyanate-system pressurised oxygen to leach gold is that the gold in the gold sulphide concentrate pre-treatment slag is with Au (SCN)
n (n-1)-The form dissolving of title complex enters leach liquor, and other base metal element remains in the leached mud, and it is good that gold leaches selectivity, and impurity element leaches few.The pH value scope that thiocyanate ion and gold ion form title complex is greater than 1.0.But pH is too high, and elementary sulfur and metallic sulfide are oxidized to sulfate radical, thiosulfate anion easily.
The leaching agent that first section pre-treatment of the present invention used is that sulfuric acid-ferrum sulfuricum oxydatum solutum is that industrial sulphuric acid adds a preceding pressurised oxygen and soaks pretreated part filtrate and mix.Adopt part to return the iron content filtrate of a preceding pressure oxidation pre-treatment output, its amount of returning should be decided according to the iron-holder of leaching agent.
Described difficult gold sulphide concentrate is the gold ore that comprises difficult sulfide such as high arsenopyrite, antimony sulfide or cupric sulfide: high arsenic sulfide gold ore, contain the copper sulfurized ore gold ore, contain arsenic antimony refractory gold ore, etc.
Thiocyanate-of the present invention is ammonium thiocyanate, potassium sulfocyanate or Sodium Thiocyanate 99, and thiocyanate ion concentration is 0.05-5.0mol/L.
For the difficult gold sulphide concentrate that contains carbonate mines such as Ca, Mg, in reactor, stir decomposition earlier under the normal pressure and discharge CO
2, logical again oxygen pressurised oxygen is soaked.
Second section pressurised oxygen soaked the filter residue that obtains and then carried out recovery sulphur and the processing of other valuable metals.
With respect to prior art, the present invention designs the mode that has adopted the two-part pressurised oxygen to soak, and the preoxidation slag does not need neutralization directly to soak gold, and it is short to have flow process, and reagent consumption is few, and three-waste free pollution is easily realized the advantage of industrialization.And the present invention also has following multiple effect by returning a preceding preprocessing part iron-containing liquor at first section, and promptly this processing mode not only can significantly improve speed of response, also can make S
2-The product that oxidation obtains is an elementary sulfur, avoids the severe corrosive of catalyzer nitric acid simultaneously; The elementary sulfur that oxidation generates in the preprocessing process soaks the leaching yield that does not only influence gold in the golden process second section pressurised oxygen simultaneously, can also play and stablize leaching agent SCN
-Effect, suppress and eliminate the effectiveness of the decomposition reaction of thiocyanate ion.
Embodiment
Following examples are intended to illustrate that the present invention rather than the present invention further limit.
Embodiment 1:
The low-grade gold sulphide concentrate of the high arsenic of Hunan mineral products, and its chemical ingredients (massfraction, %) as follows: As 10.02, S36.40, Fe 42.43, and Zn 1.05, and Si 3.69, and Al 0.98, and Mg 0.85, and Ca 1.21, Au 24.62g/t.
Pressure oxidation pretreatment condition: contain Fe
3+20.0g/L, SO
4 2-1.5mol/L leaching agent, gold ore amount 150g/L adds the wooden sodium sulfonate of 0.4% gold ore amount, control oxygen is pressed 160 ℃ of 1.4Mpa, temperature, reacts liquid-solid separation 1.0 hours.
Pre-treatment slag ammonium thiocyanate solution leaching condition: NH
4The solution of SCN 0.2mol/L, Fe
3+2.0g/L pre-treatment slag add-on 150g/L adds in the reactor and regulates pH value to 2.5 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 160 ℃, and aerating oxygen is kept air pressure 1.4MPa in the reactor, reacts 1.0 hours; After the cooling, solid-liquid separation, washing, slag contains gold less than 4g/t, and gold leaching rate is greater than 90%.10 times of calculating of down payment amount add iron powder and replace gold from leach liquors, and normal temperature stirred 1 hour down, and rate of displacement is greater than 99%, and displaced liquid is returned pressurised oxygen and soaked gold.
Embodiment 2:
Certain mineral products gold sulphide concentrate, and its chemical ingredients (massfraction, %) as follows: As 6.2, and S 14.48, and Fe 13.64, Cu0.05, Si 34.2, Al3.2, Mg 1.15, and Ca 2.11, Au 65.89g/t.
Pressure oxidation pretreatment condition: contain Fe
2+9.0g/L, SO
4 2-1.0mol/L leaching agent, gold ore amount 300g/L adds the wooden sodium sulfonate of 0.08% gold ore amount, control oxygen is pressed 130 ℃ of 1.0Mpa, temperature, reacts liquid-solid separation 4.0 hours.
Pre-treatment slag ammonium thiocyanate solution leaching condition: NH
4The solution of SCN 0.8mol/L, Fe
2+4.0g/L pre-treatment slag add-on 300g/L adds in the reactor and regulates pH value to 1.5 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 120 ℃, and aerating oxygen is kept air pressure 1.0MPa in the reactor, reacts 6.0 hours; After the cooling, solid-liquid separation, washing, slag contains golden 4.1g/t, gold leaching rate 94.4%.By extraction V
Organic phase/ V water=2/10,3 grade extraction, the percentage extraction of gold is greater than 98%, and raffinate returns pressurised oxygen and soaks gold.
Embodiment 3:
Certain mineral products gold sulphide concentrate, and its chemical ingredients (massfraction, %) as follows: As 0.56, and S 8.48, and Fe 11.34, and Cu 0.04, and Al 1.25, and Mg 10.02, and Ca 4.87, Au 83.78g/t, Ag 1252g/t.
Pressure oxidation pretreatment condition: contain Fe
3+3.0g/L, SO
4 2-3.0mol/L leaching agent, gold ore amount 200g/L adds the wooden sodium sulfonate of 0.1% gold ore amount, under 90 ℃, synthesis under normal pressure 1 hour makes carbonate decomposition, controls oxygen again and presses 140 ℃ of 0.8Mpa, temperature, reacts liquid-solid separation 2.0 hours earlier.
Pre-treatment slag ammonium thiocyanate solution leaching condition: NH
4The solution of SC N 4.0mol/L, Fe
3+8.0g/L pre-treatment slag add-on 200g/L adds in the reactor and regulates pH value to 1.8 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 140 ℃, and aerating oxygen is kept air pressure 1.2MPa in the reactor, reacts 3.0 hours; After the cooling, solid-liquid separation, washing, slag contains gold less than 6g/t, and gold leaching rate is greater than 95%.Add 5g gac ADSORPTION OF GOLD from leach liquor by every liter of leach liquor, stirred at normal temperatures 2 hours, the adsorption rate of gold is greater than 98.0%, and solution can return pressurised oxygen and soak gold.
Embodiment 4:
The Guangxi mineral products contain arsenic, antimony golden ore concentrate hard to treat, and its chemical ingredients (massfraction, %) as follows: As 5.77, S12.78, Fe 11.34, Sb 1.25, and C 5.45, and Cu 0.05, and Al 1.1, Mg 0.04, and Si 22.7, and Ca 1.38, Au 113g/t, Ag 697g/t.
The pressure oxidation pretreatment condition: a preceding pressurised oxygen is soaked the iron content that the pre-treatment golden ore concentrate hard to treat obtains and (is mainly Fe
2+) 18.01g/L solution, add industrial sulphuric acid and water and be made into iron content 5.0g/L, SO
4 2-0.8mol/L leaching agent, gold ore amount 200g/L adds the wooden sodium sulfonate of 0.15% gold ore amount, control oxygen is pressed 130 ℃ of 1.0Mpa, temperature, reacts liquid-solid separation 2.0 hours.
Pre-treatment slag ammonium thiocyanate solution leaching condition: NH
4The solution of SCN 2.5mol/L, Fe
3+0.0g/L pre-treatment slag add-on 200g/L adds in the reactor and regulates pH value to 5.0 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 130 ℃, and aerating oxygen is kept air pressure 1.2MPa in the reactor, reacts 4.0 hours; After the cooling, solid-liquid separation, washing, gold leaching rate greater than 95%, silver leaching rate is greater than 90%.5 times that press the gold and silver total amount are calculated the adding iron powder, displacement gold from leach liquor, and 60 ℃ were stirred 30 minutes down, and the rate of displacement of gold and silver is all greater than 99.5%, and solution returns pressurised oxygen and soaks.
Claims (6)
1. two sections pressurised oxygen methods of soaking are extracted the method for gold from difficult gold sulphide concentrate, it is characterized in that the mode that adopts the two-part pressurised oxygen to soak, promptly are divided into pressurised oxygen and soak pre-treatment and soak gold with pressurised oxygen and extract golden from difficult gold sulphide concentrate; First section pressurised oxygen soaked pre-treatment, adopting industrial sulphuric acid to add a preceding pressurised oxygen, to soak first section composite sulfuric acid-ferrum sulfuricum oxydatum solutum of filtrate of pretreated part be leaching agent, carry out pressure oxidation and leach, obtain first section filtrate of iron content and other foreign metal and contain the pre-treatment slag of elementary sulfur, Au; Second section pressurised oxygen soaked gold, then is the pre-treatment slag is soaked for the leaching agent pressurised oxygen with iron content ionic thiocyanate salt solution again, makes the form selective dissolution of Jin Yijin-thiocyanic acid title complex enter second section filtrate.
2. according to the described method of claim 1, it is characterized in that in described first section pressure oxidation leaching process: the leaching agent composition is iron content 1-30g/L, SO42-0.5-3mol/L; Gold ore amount 80-350g/L adds the wooden sodium sulfonate account for gold ore weight 0.05-0.5%, and control oxygen is pressed 0.4-1.8Mpa, temperature 100-180 ℃, reacts solid-liquid separation again after the cooling 0.5-4.0 hour.
3. according to the described method of claim 1, it is characterized in that in described second section pressure oxidation leaching process: leaching agent is thiocyanate 0.05-5.0mol/L, iron ion 0-10g/L; Gold ore pre-treatment slag add-on 80-300g/L adds in the reactor and regulates the pH value to 1.0-5.0 with industrial sulphuric acid or lime after the mixing; The control temperature of reaction kettle is 100 ℃-180 ℃, and aerating oxygen is kept air pressure 0.4-2.0MPa in the reactor, reacts 1.0-6.0 hour; Gold is reclaimed in cooling back solid-liquid separation, washing again from leach liquor, the solution behind the recovery gold returns pressurised oxygen and soaks.
4. according to the described method of claim 1, it is characterized in that described difficult gold sulphide concentrate is the gold ore that comprises high arsenopyrite, antimony sulfide or the difficult sulfide of cupric sulfide class.
5. according to claim 1 or 3 described methods, it is characterized in that thiocyanate-is ammonium thiocyanate, potassium sulfocyanate or Sodium Thiocyanate 99, thiocyanate ion concentration is 0.05-5.0mol/L.
6. according to the described method of claim 1, it is characterized in that,, in reactor, stir decomposition earlier under the normal pressure and discharge CO2, carry out the two-part pressurised oxygen again and soak for the difficult gold sulphide concentrate that contains Ca, Mg carbonate mine.
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| CN102409171A (en) * | 2011-12-11 | 2012-04-11 | 郴州市金贵银业股份有限公司 | New process for treating vulcanized gold-containing ore |
| CN102534204A (en) * | 2012-03-06 | 2012-07-04 | 昆明理工大学 | Thiosulfate gold extraction method taking Fe (III) cyanide salts as oxidants |
| CN102560138A (en) * | 2012-01-11 | 2012-07-11 | 森松(江苏)海油工程装备有限公司 | Pretreatment method of refractory gold ore |
| CN103409644A (en) * | 2013-09-05 | 2013-11-27 | 魏清成 | Beneficiation reagent, synthesis method and method for comprehensively utilizing generated waste gases |
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