CN103911509A - Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria - Google Patents
Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria Download PDFInfo
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- CN103911509A CN103911509A CN201210592314.6A CN201210592314A CN103911509A CN 103911509 A CN103911509 A CN 103911509A CN 201210592314 A CN201210592314 A CN 201210592314A CN 103911509 A CN103911509 A CN 103911509A
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Abstract
The invention relates to a two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria. The process comprises the steps of: (1) subjecting the Carlin-type gold deposit to crushing, fine grinding and flotation to obtain flotation gold concentrate, and conducting drug removal treatment on the flotation gold concentrate; (2) employing an exclusive bacterium I to perform first-stage oxidation on the flotation gold concentrate obtained in step (1); (3) employing an exclusive bacterium II to perform second-stage oxidation on the gold concentrate oxidizing slag obtained in step (2); and (4) subjecting the oxidizing slag obtained in step (3) to cyaniding leaching. The exclusive bacterium I is Leptospirillum ferriphilum MJ-CL, and the exclusive bacterium II is Thermoanaerobacteriumsp. L-D. Being able to improve the gold recovery rate, the process provided by the invention has the advantages of small investment, low production cost, and no generation of exhaust gas, is especially suitable for the Carlin-type gold deposit, and can obtain greater economic, social and environmental benefits.
Description
Technical field
The present invention relates to two kinds and exclusively soak ore deposit bacterium for blocking two sections of biological pre-oxidation gold extraction technology of Carlin-type Gold Deposit.
Background technology
Along with the continuous exploitation of gold ore resource, easily to process ore deposit and day by day reduce, difficult-treating gold mine will become the Main Resources of gold industry from now on.Area, osmanthus, Guizhou Province, China Yunnan contains a large amount of arsenic bearing-carbon bearing card Carlin-type Gold Deposits, and gold ore resource reserves exceed 650 tons, belongs to typical Multiple Poles difficult-treating gold mine.Therefore, the comprehensive utilization of this type gold resource has great significance to the development of later gold industry.
This resource type is because its grade is low and difficultly select smelting to be difficult to adopt traditional to adopt, choosing, smelting process carry out economic recovery, in addition adopt one section of biological pre-oxidation can not solve " charcoal is robbed gold " problem, and this resource type is often distributed in economic relatively backward remote mountain areas, be badly in need of a kind of less investment, the golden recovery process of high-efficiency environment friendly.
Summary of the invention
The object of this invention is to provide a kind of new gold extraction technology, this technique is full wet method gold extraction process, is particularly suitable for processing the arsenic bearing-carbon bearing card Carlin-type Gold Deposit that geographical position is remote.This technique has solved the problems such as conventional gold recovery is low, environmental pollution.
For achieving the above object, the present invention takes following technical scheme:
Two kinds exclusive soaks ore deposit bacterium for blocking two sections of biological pre-oxidation gold extraction technology of Carlin-type Gold Deposit, it is characterized in that: it comprises the following steps:
(1) fragmentation of card Carlin-type Gold Deposit, be finely ground to-0.074mm accounted for to 95%, adopt butylamine, fourth Huang and 2# oil flotation after copper sulphate for activation, thereby obtain gold floatation concentrate, gold floatation concentrate washing, filtering and drying after dilute sulphuric acid reagent removal is for subsequent use;
(2) adopt exclusive bacterium I to carry out first paragraph oxidation to the gold floatation concentrate obtaining in step (1);
(3) adopt exclusive bacterium II to carry out second segment oxidation to the gold ore oxidation sludge obtaining in step (2);
(4) the oxidation sludge Cyanide Leaching obtaining in step (3);
The name of described exclusive bacterium I is called leptospirillum ferriphilum Leptospirillum ferriphilum MJ-CL, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on January 13rd, 2011, and deposit number is: CCTCC NO:M2011019;
It is L-DThermoanaerobacterium sp.L-D that the name of described exclusive bacterium II is called cellulose-decomposing bacterium, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on October 17th, 2008, and deposit number is: CCTCC NO:M208166.
Described card Carlin-type Gold Deposit principal element content is Au3.05g/t, S5.95%, As0.25%, Fe7.15%, C
total1.44, C
organic0.52.Gold floatation concentrate principal element content is Au16.78g/t, S35.85%, As1.47%, Fe29.73%, C
total2.42, C
organic2.08.
Technique as above, preferably: in the first paragraph oxidation described in step (2), be finely ground to 95% by 400 orders by obtaining gold floatation concentrate in step (1), pulp density is between 10% ~ 15%, system pH is controlled at 1.2 ~ 1.8, and system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 35 DEG C ~ 40 DEG C, access exclusive bacterium I, bacteria concentration 107/more than mL.
Technique as above, preferably: in the first paragraph oxidation described in step (2), oxidation cycle 10-15 days.S oxidation ratio >=50%, As oxidation ratio >=70%.
The chemical reaction that described first paragraph oxidation occurs mainly contains:
FeS+3Fe
2(SO
4)
3+3H
2O=6FeSO
4+FeS
2O
3+3H
2SO
4
4FeAsS+4Fe
2(SO
4)
3+6H
2O+3O
2=12FeSO
4+4H
3AsO
3+4S
FeS+Fe
2(SO
4)
3=3FeSO
4+S
Technique as above, preferably: in the second segment oxidation described in step (3), pulp density is between 10% ~ 15%, system pH is controlled at 6.5 ~ 7.5, system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 25 DEG C ~ 35 DEG C, accesses exclusive bacterium II, and bacteria concentration is 10
7individual/more than mL.
Technique as above, preferably: in the second segment oxidising process described in step (3), oxidation cycle 5-10 days.C
organicoxidation ratio>=15%.
Technique as above, preferably: the Cyanide Leaching described in step (4), be at gold floatation concentrate after two-stage oxidizing, system pH is adjusted to 10 ~ 11, the sodium cyanide solution that is 5kg/t by concentration, with solid-to-liquid ratio 1:2, carries out agitation leach.
Advantage of the present invention is: utilize the present invention to block two sections of biological pre-oxidation gold extraction technology transaction card Carlin-type Gold Deposits of Carlin-type Gold Deposit, the leaching yield of gold is significantly improved, and has obtained larger economic interests, social benefit and environmental protection interests.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Specific implementation method
The name of the present invention's exclusive bacterium I used is called leptospirillum ferriphilum Leptospirillum ferriphilumMJ-CL, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on January 13rd, 2011, and deposit number is: CCTCC NO:M 2011019.
It is L-DThermoanaerobacteriumsp.L-D that the name of exclusive bacterium II used is called cellulose-decomposing bacterium, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on October 17th, 2008, and deposit number is: CCTCC NO:M 208166.
As shown in Figure 1, flotation after the card Carlin-type Gold Deposit fragmentation of collection, fine grinding is obtained gold ore by the present invention, after gold ore reagent removal for follow-up two-stage oxidizing, utilize exclusive bacterium I under acidic conditions, to carry out first paragraph bio-oxidation, utilize exclusive bacterium II under neutrallty condition, to carry out second segment bio-oxidation, the oxidation sludge obtaining after two-stage oxidizing is Cyanide Leaching under alkaline condition.
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
The present invention is applied to Guizhou card Carlin-type Gold Deposit, and object mineral are native state, and under microscope, the micro-fine-grained gold embedding of visible minute quantity is distributed in gangue, many and pyrite, and granularity is minimum.Metal sulfide ore is taking pyrite as main, containing a small amount of mispickel and zink sulphide, chalcopyrite, the lead glance of minute quantity.Metal oxide is mainly limonite, is secondly magnetite, rhombohedral iron ore.Gangue mineral is mainly quartz and clay mineral, and containing a small amount of fluorite, rhombspar, mica etc., carbon content is higher.Ore is containing Au3.05g/t, S5.95%, As0.25%, C
total1.44, wherein C
organic0.52.
Gold extraction technology flow process to above-mentioned ore comprises the following steps:
1, the fragmentation of ore, fine grinding, flotation
By crushing raw ore, be finely ground to-0.074mm accounts for 95%, adopt butylamine, fourth Huang and 2# oil flotation after copper sulphate for activation, obtains gold floatation concentrate, gold floatation concentrate washing, filtering and drying after dilute sulphuric acid reagent removal is for subsequent use.Gold floatation concentrate principal element content is Au16.78g/t, S35.85%, As1.47%, Fe29.73%, C
total2.42, C
organic2.08, fine grinding after gold floatation concentrate reagent removal, grinding fineness is 95% by 400 orders.
2, the first paragraph bio-oxidation of gold floatation concentrate
The name of gold floatation concentrate first paragraph bio-oxidation exclusive bacterium I used is called leptospirillum ferriphilum Leptospirillum ferriphilum MJ-CL, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on January 13rd, 2011, and deposit number is: CCTCCNO:M 2011019.
First paragraph bio-oxidation: stir system pulp density 10%, system pH is controlled at 1.2 ~ 1.8, and system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 35 DEG C ~ 40 DEG C, access exclusive bacterium I, exclusive bacterium I bacteria concentration is 10
7individual/more than mL, oxidation cycle 10-15 days, S oxidation ratio>=50%, As oxidation ratio>=70%.
3, the second segment bio-oxidation of gold floatation concentrate
It is L-DThermoanaerobacterium sp.L-D that the name of gold floatation concentrate second segment bio-oxidation exclusive bacterium II used is called cellulose-decomposing bacterium, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on October 17th, 2008, and deposit number is: CCTCCNO:M 208166.
Gold floatation concentrate, after first paragraph bio-oxidation, between regulation system pH to 6.5-7.5, accesses exclusive bacterium II, and pulp density 10% is constant, and system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 25 DEG C ~ 35 DEG C.Oxidation cycle 5-10 days, C
organicoxidation ratio>=15%.
4, the Cyanide Leaching of two-stage oxidizing rear oxidation slag
Oxidation sludge and tap water mix by solid-to-liquid ratio 1:2, and with CaO regulation system pH to 10-11, sodium cyanide concentration used is 5%, add by 5kg/t, and ventilation Cyanide Leaching 48h, gold leaching rate is 77.91%.
Conclusion: utilize the present invention to block two sections of biological pre-oxidation gold extraction technology of Carlin-type Gold Deposit and process this kind of ore, the leaching yield of gold brings up to 77.91% by 10.24%, the leaching yield of gold is significantly improved, and has obtained larger economic interests, social benefit and environmental protection interests.
Claims (6)
1. two kinds are exclusively soaked ore deposit bacterium for blocking two sections of biological pre-oxidation gold extraction technology of Carlin-type Gold Deposit, it is characterized in that: it comprises the following steps:
(1) fragmentation of card Carlin-type Gold Deposit, be finely ground to-0.074mm are accounted for to 95%, with adopting butylamine, fourth Huang and 2# oil flotation after copper sulphate for activation, thereby obtain gold floatation concentrate, gold floatation concentrate washing, filtering and drying after sulfuric acid reagent removal is for subsequent use;
(2) adopt exclusive bacterium I to carry out first paragraph oxidation to the gold floatation concentrate obtaining in step (1);
(3) adopt exclusive bacterium II to carry out second segment oxidation to the gold ore oxidation sludge obtaining in step (2);
(4) the oxidation sludge Cyanide Leaching obtaining in step (3);
The name of described exclusive bacterium I is called leptospirillum ferriphilum Leptopirillum ferriphilum MJ-CL, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on January 13rd, 2011, and deposit number is: CCTCC NO:M2011019;
It is L-DThermoanaerobacteriumsp.L-D that the name of described exclusive bacterium II is called cellulose-decomposing bacterium, this microorganism has been deposited in Chinese Typical Representative culture collection center C CTCC, address is positioned at Wuhan University, preservation date is on October 17th, 2008, and deposit number is: CCTCC NO:M208166.
2. technique according to claim 1, it is characterized in that: in the first paragraph oxidation described in step (2), be finely ground to 95% by 400 orders by obtaining gold floatation concentrate in step (1), pulp density is between 10% ~ 15%, system pH is controlled at 1.2 ~ 1.8, and system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 35 DEG C ~ 40 DEG C, access exclusive bacterium I, bacteria concentration is 10
7individual/more than mL.
3. technique according to claim 1, is characterized in that: in the first paragraph oxidation described in step (2), and oxidation cycle 10-15 days.
4. technique according to claim 1, it is characterized in that: in the second segment oxidation described in step (3), pulp density is between 10% ~ 15%, system pH is controlled at 6.5 ~ 7.5, system oxidation reduction potential control is at 450mV ~ 650mV(vs.SHE) between, system temperature is between 25 DEG C ~ 35 DEG C, accesses exclusive bacterium II, and bacteria concentration is 10
7individual/more than mL.
5. technique according to claim 1, is characterized in that: in the second segment oxidising process described in step (3), and oxidation cycle 5-10 days.
6. technique according to claim 1, is characterized in that: the Cyanide Leaching described in step (4), be at gold floatation concentrate after two-stage oxidizing, system pH is adjusted to 10 ~ 11, the sodium cyanide solution that is 5kg/t by concentration, with solid-to-liquid ratio 1:2, carries out agitation leach.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104263910A (en) * | 2014-09-03 | 2015-01-07 | 江西三和金业有限公司 | Process of treating high-arsenic ores by branched streaming and oxidative countercurrent washing arsenic-removal |
| CN105714126A (en) * | 2016-02-02 | 2016-06-29 | 青岛智瑞生物有限公司 | Branch biological oxidation technology for high-arsenic and high-sulfur gold concentrate |
| CN106702155A (en) * | 2016-12-12 | 2017-05-24 | 东北大学 | Method for improving bacterial oxidation efficiency of high-sulfur refractory gold ores through low-power-consumption microwave activation |
| CN108624760A (en) * | 2017-03-16 | 2018-10-09 | 北京有色金属研究总院 | Carbonaceous golden ore concentrate hard to treat microwave biological pre-oxidizes extraction of gold process |
| CN109112306A (en) * | 2018-08-02 | 2019-01-01 | 中南大学 | A method of utilizing ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat |
| CN113262883A (en) * | 2020-10-27 | 2021-08-17 | 水口山有色金属有限责任公司 | Flotation method for improving grade of high-sulfur gold concentrate |
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| EP3415647A1 (en) * | 2017-06-13 | 2018-12-19 | B.R.A.I.N. Ag | A process for recovering precious metals from secondary resources |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104263910A (en) * | 2014-09-03 | 2015-01-07 | 江西三和金业有限公司 | Process of treating high-arsenic ores by branched streaming and oxidative countercurrent washing arsenic-removal |
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| CN105714126A (en) * | 2016-02-02 | 2016-06-29 | 青岛智瑞生物有限公司 | Branch biological oxidation technology for high-arsenic and high-sulfur gold concentrate |
| CN106702155A (en) * | 2016-12-12 | 2017-05-24 | 东北大学 | Method for improving bacterial oxidation efficiency of high-sulfur refractory gold ores through low-power-consumption microwave activation |
| CN106702155B (en) * | 2016-12-12 | 2018-05-29 | 东北大学 | The method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency |
| CN108624760A (en) * | 2017-03-16 | 2018-10-09 | 北京有色金属研究总院 | Carbonaceous golden ore concentrate hard to treat microwave biological pre-oxidizes extraction of gold process |
| CN108624760B (en) * | 2017-03-16 | 2021-03-09 | 有研工程技术研究院有限公司 | Microwave biological pre-oxidation gold extraction process for carbonaceous refractory gold concentrate |
| CN109112306A (en) * | 2018-08-02 | 2019-01-01 | 中南大学 | A method of utilizing ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat |
| CN113262883A (en) * | 2020-10-27 | 2021-08-17 | 水口山有色金属有限责任公司 | Flotation method for improving grade of high-sulfur gold concentrate |
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| CN103911509B (en) | 2015-08-26 |
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