CN106148693A - A kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method - Google Patents
A kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method Download PDFInfo
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- CN106148693A CN106148693A CN201610858387.3A CN201610858387A CN106148693A CN 106148693 A CN106148693 A CN 106148693A CN 201610858387 A CN201610858387 A CN 201610858387A CN 106148693 A CN106148693 A CN 106148693A
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- gold
- sulfur
- leaching
- arsenic
- activated carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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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 invention provides a kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method.First the method adds solid activated carbon strengthening PREPROCESSING OF A REFRACTORY GOLD, carries out activated carbon adsorption Leaching of Gold after then adjusting pulp density and pH.Consumption at biological oxidation stage solid activated carbon is 6g/L～10g/L, and particle size range is 1mm～5mm, and under the effect of solid activated carbon, the oxidization time of bioleaching sulfur-bearing arsenic difficult-treating gold mine significantly shortens, leaching rate is greatly improved；It is directly used in leaching gold after adjusting pulp density and pH after having pre-oxidized, resolves after leaching gold and reclaim gold and arsenic.The method be sulfur-bearing arsenic difficult-treating gold mine Bacterial Pre-oxidation and leaching gold provide important theory and technological guidance.
Description
Technical field
The invention belongs to field of hydrometallurgy, relate to a kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method, it is achieved antibacterial is to containing
Efficiently pre-oxidation and the leaching of gold of sulfur arsenic difficult-treating gold mine, thus carry gold for sulfur-bearing arsenic difficult-treating gold mine and create favorable conditions.
Background technology
Gold not only has the currency Stored Value being difficult to substitute and evades the effect of financial risks, but also in industry and high-tech
Skill field is with a wide range of applications.In China, along with easily selecting the day by day exhausted of gold ore resource, difficult-treating gold mine becomes gold
The primary raw material produced, difficult-treating gold mine accounts for more than the 60% of world's gold reserve, but utilization rate is low.Efficiently utilize difficult gold
Ore deposit becomes and puies forward the research topic that golden collar territory is important and urgent.Biohydrometallurgy technology has that technique is simple, small investment, cost
Low, reaction is gentle, economic benefit is higher, the feature of cleaning, and can effective exploitation mineral resources low-grade, difficult and become
The focus of field of metallurgy research.Recent decades, biological metallurgy technology has had in the leaching of difficult-treating gold mine to be studied widely,
And successfully obtain commercial Application, as the Dexing copper mine of China, Zijin Mining, Shandong recruit gold etc..Visible, utilize biological metallurgy
Technology processes gold mine, and especially sulfur-bearing arsenic difficult-treating gold mine aspect has broad prospects.
The industrial process of bacterial oxidation sulfur-bearing arsenic difficult-treating gold mine is relatively slower at present, and problem is mainly at bioleaching sulfur-bearing
Arsenic difficult-treating gold mine speed is slow and sulfur arsenic leaching rate is low, therefore, strengthens bacterial oxidation sulfur-bearing arsenic gold mine, finds the side of Strengthen education
Method, will be to realize industrialized key.
There are some researches show that the leaching velocity of metalliferous mineral is directly proportional with leaching the concentration of antibacterial in medium, want to improve mineral
Leaching velocity, then must assure that rapid growth of bacteria is bred.To accomplish during bioleaching sulfur-bearing arsenic difficult-treating gold mine
One of essential condition of this point is to reduce the toxicity of arsenic in leachate, provides the good environment of a Fast-propagation to antibacterial.
In the solution of bioleaching sulfur-bearing arsenic difficult-treating gold mine, As3+Toxicity be approximately As5+60 times.For reducing in leaching process
The toxicity of arsenic, current research has: 1) utilize the strong oxidizing property of oxidant by As3+It is converted into As5+；2) ferrum and arsenic reaction are utilized
Form arsenate precipitation or secondary mineral；3) Fe is relied on3+To bacteriogenic activation, antibacterial is promoted to be got rid of by arsenic external.
The studies above utilizes oxidant by As3+It is converted into As5+, but in solution, arsenic concentration does not reduce, As5+Toxicity also compare
Strong, and to add oxidant be harmful to the activity of antibacterial, can be formed when additionally arsenic reaches a certain amount of arsenate precipitation or
Secondary mineral covers and forms passivating film on gold mine surface, hinders the further oxidation of gold mine.Therefore the best way is to use thing
The method of reason absorption reduces the concentration of arsenic in solution, avoids generating precipitation simultaneously.
Activated carbon interpolation in biological metallurgy rarely has report, and Nakazawa H, Zhang Weimin, Zhou Peiguo et al. are at Chalkopyrite
The research adding activated carbon in Bio-leaching confirms, although reduces the activity of antibacterial after adding activated carbon, but can add
The oxidation rate of fast Chalkopyrite, shortens leaching cycle, improves the leaching rate of copper, trace it to its cause be activated carbon be good conductor,
Electrostatic potential is high, and it is right that the copper ion generated with reaction forms electricity, enhances the electrochemical leaching of Chalkopyrite.Yang Hongying, Liu Wei, Tong Lin
Beautiful jade et al. adds activated carbon in the Bioleaching of cobalt mineralss can shorten leaching cycle, improves the leaching rate of cobalt, and its principle is still
It is so electrochemical leaching, i.e. galvanic effect.So they are in order to strengthen galvanic effect, it is necessary to the comparison that activated carbon is ground
Carefully (reach 80～200 mesh and account for 100%) to meet the needs of galvanic element.
More than study the biological pre-oxidation to gold mine especially difficult-treating gold mine and overall applicability does not has referentiability.First
First, in sulfur-bearing arsenic gold mine, sulfide (pyrite, mispickel etc.) is easily by bacterial oxidation, and its difficult point is solution after oxidation
In arsenic can poison antibacterial, cause inactivation of bacteria so that biological pre-oxidation process terminate, so sulfur-bearing arsenic biological pre-oxidation is strong
That change it is crucial that the arsenic that processes in solution.Secondly, sulfur-bearing arsenic gold mine to carry gold, many institutes after Bacterial Pre-oxidation processes further
Known, be most afraid of carbon containing in gold mine, gold can be caused " robbing gold " by charcoal, and the adsorption of charcoal can cause the gold in Ore to leach back
Receive and utilize (the additional activated carbon of the present invention then can adsorb the gold of leaching, further enhances the leaching of Gold in Ores), therefore, with top
Method can deteriorate the leaching of gold.
Therefore, how the arsenic ion concentration in leachate is reduced, and avoid arsenic ion generation precipitation to be to speed up antibacterial leaching
Going out the key of sulfur-bearing arsenic difficult-treating gold mine, additive can not affect follow-up leaching gold simultaneously.
Based on the current bioleaching sulfur-bearing inefficient problem of arsenic difficult-treating gold mine, the special proposition present invention.
Summary of the invention
It is an object of the invention to provide a kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method, solve bioleaching sulfur-bearing arsenic difficulty
Reason Gold ore leaching cycle length and the low problem of leaching rate, and the problem that follow-up leaching gold recovery is low, for the difficult gold of sulfur-bearing arsenic
The Efficient Development in ore deposit utilizes provides technological guidance.
In order to realize object above, the technical scheme is that
A kind of sulfur-bearing arsenic difficult-treating gold mine gold extracting method, adds solid and lives when Bacterial Pre-oxidation sulfur-bearing arsenic difficult-treating gold mine
Property charcoal.
Described method, solid activated carbon consumption in pre-oxidation system is 6g/L～10g/L, preferably 8-10g/L.
Described method, solid activated carbon particle size range is 1mm～5mm.
Described method, Bacterial Pre-oxidation system includes: 9K culture medium, sulfur-bearing arsenic difficult-treating gold mine, solid activated carbon, addicted to
Acidic oxidation ferrous iron Thiobacillus.
Described method, bacterial concentration 1～2.0 × 10 after inoculation in Bacterial Pre-oxidation system solution8Individual/ml, antibacterial is pre-
Oxidation system liquid-solid ratio is 5-20ml/g.
Described method, Bacterial Pre-oxidation system solution control of Electric potentials is at 500-550mv, the time range 6-10 of pre-oxidation
My god.
Described method, controls activated carbon addition and makes the concentration model of total arsenic in solution be less than 8g/L.
Described method, after Bacterial Pre-oxidation completes, adds leaching gold agent and carries out the leaching of gold after adjusting pulp density and pH value
Go out.
Described method, has leached rear strainer filtering recovered carbon, has then resolved and reclaim gold and arsenic, and last solid is lived
Property charcoal return Bacterial Pre-oxidation system carry out again with.
Described method, the method is suitable for various sulfur-bearing arsenic difficult-treating gold mine.
The method of the present invention can significantly shorten the microbial leaching cycle and improve leaching rate, shorten 5 days reaction times with
On, the leaching rate of arsenic can reach more than 80%, is relatively not added with activated carbon and increases 30%.In the middle and late stage Leaching Systems of leaching ore deposit
The concentration of antibacterial reaches 109～12Individual/ml, is relatively not added with the increase by 10 of activated carbon1～3Times.On the one hand solid activated carbon contains in catalysis
The starting stage of sulfur arsenic difficult-treating gold mine bioleaching, the As ion in leachate there is adsorption, particularly As3+Suction
Attached, decrease As3+Toxic action to antibacterial, thus promote the propagation of antibacterial, make total biomass increase sharply, meanwhile, molten
In liquid, arsenic concentration reduces, and decreases a large amount of generations of ferric arsenate, decreases the generation of gold mine surface passivation thing, thus promote and contain
The active oxidation of sulfur arsenic gold mine.After the arsenic added in adsorbent solution of solid activated carbon, bacterial activity increases, and accelerates Fe2+
Oxidation rate, Fe in leaching process3+Concentration is maintained at higher level, thus promotes that the oxidation of sulfur-bearing arsenic difficult-treating gold mine divides
Solve.Decompose the energy that the Fe (II) produced and S is bacterial growth breeding and strengthen the leaching of sulfur-bearing arsenic difficult-treating gold mine further, from
And promote the speed of bioleaching sulfur-bearing arsenic difficult-treating gold mine.Carrying out the leaching of gold after biological pre-oxidation, activated carbon is just
As the adsorbent of gold, expand the value of activated carbon, make activated carbon be recycled, saved the energy, to environment
Protection has very important meaning.Therefore, the method will be that one is effectively improved in bioleaching sulfur-bearing arsenic difficult-treating gold mine
The measure of arsenic leaching rate and the effective ways of recovery gold.
Detailed description of the invention
The present invention is further illustrated below in conjunction with embodiment, and the unrestricted present invention.
Implementation condition:
The content of sulfur-bearing arsenic difficult-treating gold mine arsenic is 19.32%, mainly exists with arsenic sulfide and mispickel form.Other
Condition: the antibacterial of oxide ore is conventional ore-leaching bacteria Acidithiobacillus ferrooxidans, Pre oxidation 28-32 DEG C, rotating speed
120-180r/min, the liquid-solid ratio of biological oxidation is 5-20ml/g, controls activated carbon addition and makes the concentration model of total arsenic in solution little
In 8g/L, Bacterial Pre-oxidation system solution control of Electric potentials is at 500-550mv, the time range of pre-oxidation 6-10 days.The leaching of gold
Condition is consistent with conventional leaching condition, and gold leachate ratio admittedly is for 3:1ml/g, speed of agitator 600-1000rpm, normal temperature and pressure.
Embodiment 1: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 6g/L, finally inoculation 15ml acidophilia's ferrous oxide sulfur after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to bacillus (A.f bacterium)8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore deposit
Add leaching gold agent after slurry concentration and pH value and carry out the leaching of gold.The leaching rate of arsenic is 66.1%, As in leachate3+Concentration
3.2g/L, As5+Concentration 2g/L, the concentration of antibacterial is 109Individual/ml, the response rate of gold is 73.1%.
Embodiment 2: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 8g/L, finally inoculation 15ml acidophilia's ferrous oxide sulfur after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to bacillus (A.f bacterium)8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore deposit
Add leaching gold agent after slurry concentration and pH value and carry out the leaching of gold.The leaching rate of arsenic is 81.2%, As in leachate3+Concentration 3g/
L, As5+Concentration 2.1g/L, the concentration of antibacterial is 1012Individual/ml, the response rate of gold is 95.8%.
Embodiment 3: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 10g/L, finally inoculation 15ml acidophilia's ferrous oxide sulfur after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to bacillus (A.f bacterium)8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore deposit
Add leaching gold agent after slurry concentration and pH value and carry out the leaching of gold.The leaching rate of arsenic is 77.9%, As in leachate3+Concentration
2.8g/L, As5+Concentration 2g/L, the concentration of antibacterial is 1011Individual/ml, the response rate of gold is 90.15%.
Embodiment 4: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 8g/L, finally inoculation 15ml acidophilia's ferrous oxide sulfur after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to bacillus (A.f bacterium)8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore deposit
Add leaching gold agent after slurry concentration and pH value and carry out the leaching of gold.The leaching rate of arsenic is 83.5%, As in leachate3+Concentration
3.1g/L, As5+Concentration 1.9g/L, the concentration of antibacterial is 1012Individual/ml, the response rate of gold is 96.7%.
Embodiment 5: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 8g/L, finally inoculation 15ml acidophilia's ferrous oxide sulfur after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to bacillus (A.f bacterium)8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore deposit
Add leaching gold agent after slurry concentration and pH value and carry out the leaching of gold.The leaching rate of arsenic is 87.5%, As in leachate3+Concentration
3.1g/L, As5+Concentration 1.9g/L, the concentration of antibacterial is 1012Individual/ml, the response rate of gold is 97.4%.
Reference examples 1: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, without solid activated carbon after sterilizing, and finally inoculation 15ml Acidithiobacillus ferrooxidans
(A.f bacterium) (in system, the concentration of antibacterial is 1.6 × 10 in system8Individual/ml), after Bacterial Pre-oxidation completes, adjust ore pulp dense
Add leaching gold agent after degree and pH value and carry out the leaching of gold.The leaching rate of arsenic is 59.19%, As in leachate3+Concentration 3.9g/L,
As5+Concentration 2.1g/L, the concentration of antibacterial is 108Individual/ml, the additional solid activated carbon 8g/L when leaching gold, the response rate of gold is
70%.
Reference examples 2: add the 9K culture medium solution of 100mL in 250mL conical flask, be subsequently adding the sulfur-bearing of certain mass
Arsenic difficult-treating gold mine carries out sterilizing, adds the solid activated carbon of 8g/L (be milled to 200 mesh and reach 100%), finally inoculate after sterilizing
In system, (in system, the concentration of antibacterial is 1.6 × 10 to 15ml Acidithiobacillus ferrooxidans (A.f bacterium)8Individual/ml), antibacterial
After having pre-oxidized, add leaching gold agent after adjusting pulp density and pH value and carry out the leaching of gold.The leaching rate of arsenic is 61.5%, leaching
Go out As in liquid3+Concentration 2.4g/L, As5+Concentration 1.6g/L, the concentration of antibacterial is 5*108Individual/ml, the response rate of gold is 5%.
Claims (10)
1. a sulfur-bearing arsenic difficult-treating gold mine gold extracting method, it is characterised in that: when Bacterial Pre-oxidation sulfur-bearing arsenic difficult-treating gold mine
Add solid activated carbon.
Method the most according to claim 1, it is characterised in that: solid activated carbon consumption in pre-oxidation system is 6g/L
～10g/L, preferably 8-10g/L.
Method the most according to claim 1 and 2, it is characterised in that: solid activated carbon particle size range is 1mm～5mm.
Method the most according to claim 1, it is characterised in that: Bacterial Pre-oxidation system includes: 9K culture medium, sulfur-bearing arsenic are difficult
Process gold mine, solid activated carbon, Acidithiobacillus ferrooxidans.
5. according to the method described in claim 1 or 4, it is characterised in that: in Bacterial Pre-oxidation system solution, after inoculation, antibacterial is dense
Degree 1～2.0 × 108Individual/ml, Bacterial Pre-oxidation system liquid-solid ratio is 5-20ml/g.
Method the most according to claim 5, it is characterised in that: Bacterial Pre-oxidation system solution control of Electric potentials is at 500-
550mv, the time range of pre-oxidation 6-10 days.
Method the most according to claim 5, it is characterised in that: control activated carbon addition and make the concentration model of total arsenic in solution
Less than 8g/L.
Method the most according to claim 1, it is characterised in that: after Bacterial Pre-oxidation completes, adjust pulp density and pH value
Rear addition leaching gold agent carries out the leaching of gold.
Method the most according to claim 8, it is characterised in that: leach rear strainer filtering recovered carbon, then solved
Analysis reclaim gold and arsenic, last solid activated carbon return Bacterial Pre-oxidation system carry out again with.
Method the most according to claim 1, it is characterised in that: the method is suitable for various sulfur-bearing arsenic difficult-treating gold mine.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111560519A (en) * | 2020-06-16 | 2020-08-21 | 江西一元再生资源有限公司 | Integral utilization method of arsenic-containing gold concentrate |
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| CN102634661A (en) * | 2012-04-06 | 2012-08-15 | 中南大学 | Application of additive in enhancing oxidization of arsenical gold mineral by bacteria |
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2016
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Patent Citations (3)
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| CN102634661A (en) * | 2012-04-06 | 2012-08-15 | 中南大学 | Application of additive in enhancing oxidization of arsenical gold mineral by bacteria |
| JP2014055311A (en) * | 2012-09-11 | 2014-03-27 | Jx Nippon Mining & Metals Corp | Recovery method of gold |
| CN104451173A (en) * | 2014-12-11 | 2015-03-25 | 江西一元再生资源有限公司 | Method for flotation recovery of gold from gold-extracting tailings obtained from preliminary biooxidation-carbon-in-pulp process |
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| CN111560519A (en) * | 2020-06-16 | 2020-08-21 | 江西一元再生资源有限公司 | Integral utilization method of arsenic-containing gold concentrate |
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Application publication date: 20161123 |