CN106636634A - Technology for catalyzing thiosulfate to leach gold - Google Patents
Technology for catalyzing thiosulfate to leach gold Download PDFInfo
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- CN106636634A CN106636634A CN201611257286.7A CN201611257286A CN106636634A CN 106636634 A CN106636634 A CN 106636634A CN 201611257286 A CN201611257286 A CN 201611257286A CN 106636634 A CN106636634 A CN 106636634A
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- gold
- thiosulfate
- leaching
- sulfosalicylic acid
- ore pulp
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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
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
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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
According to a conventional thiosulfate method, cupric sulphate and an ammonia solution need to be added for catalyzing and leaching gold, and S2O3<2-> is easy to be oxidized and decomposed by Cu (II), so that the consumption of thiosulfate is high, and the usage of NH3 can also generate a large threaten to atmosphere environment and water body environment. The invention discloses a new technology for catalyzing the thiosulfate for leaching gold. Ferric sulfate and sulfosalicylic acid or sulfosalicylic acid sodium salt substituting the cupric sulphate and the ammonia solution is added to thiosulfate gold leaching ore slurry. According to the technology disclosed by the invention, the consumption of the thiosulfate is notably reduced; the usage of the ammonia solution is also avoided, so that the threaten of NH3 to the environment is avoided; and in addition, the gold leaching rate of the thiosulfate catalyzed by the technology is equivalent to that of the catalysis of the conventional copper and ammonia.
Description
Technical field
The present invention relates to technical field of wet metallurgy, specifically a kind of technique of catalysis Leaching of Gold Using Thiosulfate.
Background technology
Cyaniding dominates for a long time because of technical maturity, low cost and other advantages in gold extracts industry.But due to cyanogen
Compound severe toxicity, the leaching gold method easily pollutes environment and endangers the health of workman aborning.In addition, also there is leaching gold speed in cyaniding
Rate is slow, it is impossible to the shortcomings of effectively leaching difficult-treating gold mine.Therefore, non-cyanide gold-leaching is increasingly becoming the focus of research.Numerous
In non-Process for the cyanation, thiosulfate technique has that the golden agent of leaching is nontoxic, reagent is cheap, the golden speed of leaching is fast, can efficiently leach cupric and
The advantages such as the difficult-treating gold mines such as carbonaceous, therefore it is widely believed that most potential replacement cyaniding.But current review on thiosulfate leaching
Gold also rarely has commercial Application, and its bottleneck problem for existing is that the golden agent consumption of leaching is big.The net reaction of review on thiosulfate leaching gold is such as
Shown in formula (1), if the presence without catalyst under normal temperature and pressure, the reaction carries out slowly.When introducing Cu in system
(II)、NH3Afterwards, soak golden speed and improve 18～20 times.But metastable S2O3 2-With stronger reproducibility, easily by Cu (II) oxygen
Change and decompose, generate SxO6 2-、SO3 2-、S2-Deng.This composition for allowing for gold leachate becomes extremely complex, is extremely unfavorable for
The recycling of leachate and the recovery of gold, and partially decomposed product will also absorption on goldc grains surface, cause Gold leaching difficult.This
Outward, the use of ammonia also can produce threat to environment.NH in air3Safe level be 14mg/L, be put into similar to HCN toxicity
A class gas；NH in water body3It is listed in similar with chloride toxicity.
4Au+8S2O3 2-+O2+2H2O→4[Au(S2O3)2]3-+4OH- (1)
Bottleneck problem-leaching agent to solve Leaching of Gold Using Thiosulfate commercial Application consumes high.Research both domestic and external is main
Concentrate on Cu2+The replacement of the control of concentration and the molten amount of oxygen etc., the use of additive and cuprammonium catalysis these aspects.Due to leaching
Cu in liquid2+Molten amount of concentration, oxygen etc. is dynamic value, and it is extremely difficult that them are controlled in practical operation in suitable scope.
For certain types of gold mine, the use of some additives has certain effect to the consumption for reducing thiosulfate.But add
There is matching between agent and ore type, also do not occur the additive that generally can effectively reduce thiosulfate consumption at present.
Cuprammonium catalysis Leaching of Gold Using Thiosulfate is replaced using ironweed acid, iron EDTA, nickel ammonia, leaching agent consumption is can obviously reduce.But adopt
When being catalyzed with ironweed acid, iron EDTA, pH value of solution must be controlled 4.2～6.4, unfavorable is stablized to thiosulfate, and must also be added
Reagent-the thiocarbamide being potentially carcinogenic soaks golden speed to improve.When being catalyzed using nickel ammonia, the use of ammonia will be larger to environment generation
Threaten.
To solve the problems, such as the leaching agent consumption height and ammonia threatening environment of current review on thiosulfate leaching gold presence, spy proposes
The present invention.
The content of the invention
It is an object of the invention to provide a kind of leaching gold agent consumes low and little to the environmental threat new work of Leaching of Gold Using Thiosulfate
Skill.
One kind catalysis Leaching of Gold Using Thiosulfate technique, adds ferric sulfate and sulfosalisylic in Leaching of Gold Using Thiosulfate ore pulp
Acid or sulfosalicylic acid sodium salt replace the addition of copper sulphate and ammoniacal liquor.
Described catalysis Leaching of Gold Using Thiosulfate technique, initial concentration of the ferric sulfate in ore pulp be 0.005～
0.02mol/dm3；The initial concentration of sulfosalicylic acid or sulfosalicylic acid sodium salt in ore pulp is 0.01～0.06mol/dm3。
Described catalysis Leaching of Gold Using Thiosulfate technique, ferric sulfate and sulfosalicylic acid or the mol ratio of sulfosalicylic acid sodium salt
Scope is 1:2～1:3.
Described catalysis Leaching of Gold Using Thiosulfate technique, initial concentration of the thiosulfate in ore pulp be 0.1～
1.0mol/dm3。
Described catalysis Leaching of Gold Using Thiosulfate technique, will contain that golden raw material is broken first, wet-milling to -200 mesh account for 90% with
On, regulation ore pulp to the mass concentration that adds water is 25～40%；Then a certain amount of ferric sulfate, sulfosalicylic acid are added toward ore pulp
Or sulfosalicylic acid sodium salt, thiosulfate is added afterwards, and with NaOH pH values of pulp is adjusted to 8.0～10.0；Finally in sky
Gas atmosphere, 0～45 DEG C, 6.0～24.0h of gold is soaked under conditions of 100～300r/min of stir speed (S.S.).
The present invention can produce following effect during Leaching of Gold Using Thiosulfate：
1st, the leaching agent consumption of cuprammonium catalysis Leaching of Gold Using Thiosulfate is generally up to 20kg/tRaw materialMore than, and adopt after the present invention
Consumption can be down to 6.0kg/tRaw materialBelow.
2nd, be conducive to leachate recycling and leachate in gold recovery.Due to S in leaching process2O3 2-Oxidation
Decomposition amount is substantially reduced, therefore catabolite such as S in leachatexO6 2-、SO3 2-、S2-Deng concentration also substantially reduce, so as to be conducive to
The recycling of leachate and the recovery of GOLD FROM PLATING SOLUTION.
3rd, environmental protection is conducive to.The use of ammoniacal liquor is present invention, avoiding, NH is eliminated3Threat to air and water body, while
The sulfosalicylic acid or sulfosalicylic acid sodium toxicity for using is low, and it is widely used as medicine intermediate and biochemical reagents, strong to human body
Health and Environmental security threaten little.
Specific embodiment
Further illustrate the present invention with reference to embodiment, and the unrestricted present invention.
Material condition one：Certain quartz vein gold ore stone, the wherein grade of Au are 5.6g/t, and the content of Fe, S, Cu is respectively
5.33%th, 0.03%, 0.03%, main gangue is quartz.
Reference examples 1：First ore reduction, wet ball-milling to -200 mesh are accounted for into 90%, and adjust ore pulp and be to mass concentration
40%.The backward ore pulp in sequentially add copper sulphate, ammoniacal liquor, sodium thiosulfate to respectively 0.03mol/dm3、1.0mol/
dm3、0.30mol/dm3.Then with NaOH adjust pH values of pulp be 10.0,25 DEG C, air atmosphere, stir speed (S.S.) 200r/
6.0h is leached under conditions of min, the leaching rate of gold is 88.5%, the consumption of sodium thiosulfate is 34.13kg/tRaw material。
Embodiment 1：To in the ore pulp as described in reference examples 1, ferric sulfate is initially charged to 0.005mol/dm3, sulfosalicylic acid
Sodium is to 0.01mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding sodium thiosulfate to 0.3mol/dm3, it is used in combination
It is 8.0 that NaOH adjusts pH values of pulp, and 8.0h, the leaching of gold are leached under the conditions of other leaching conditions and the identical of reference examples 1
Rate is 88.8%, and the consumption of sodium thiosulfate is 4.82kg/tRaw material。
Embodiment 2：To in the ore pulp as described in reference examples 1, ferric sulfate is initially charged to 0.01mol/dm3, sulfosalicylic acid
Sodium is to 0.02mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding ATS (Ammonium thiosulphate) to 0.25mol/dm3, it is used in combination
It is 8.0 that NaOH adjusts pH values of pulp, and 8.0h, the leaching of gold are leached under the conditions of other leaching conditions and the identical of reference examples 1
Rate is 89.3%, and the consumption of ATS (Ammonium thiosulphate) is 5.08kg/tRaw material。
Embodiment 3：To in the ore pulp as described in reference examples 1, ferric sulfate is initially charged to 0.02mol/dm3, sulfosalicylic acid
Sodium is to 0.04mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding sodium thiosulfate to 0.30mol/dm3, it is used in combination
It is 8.0 that NaOH adjusts pH values of pulp, and 6.0h, the leaching of gold are leached under the conditions of other leaching conditions and the identical of reference examples 1
Rate is 90.2%, and the consumption of sodium thiosulfate is 5.44kg/tRaw material。
Material condition two：The grade of certain gold floatation concentrate, wherein Au is 42.49g/t, and the content of Fe, S, C, Cu is respectively
16.93%th, 14.25%, 0.80% and 0.2%, its main mineral constituent is pyrite and quartz.
Reference examples 2：First ore reduction, wet ball-milling to -200 mesh are accounted for into 100%, and adjust ore pulp and be to mass concentration
25%.The backward ore pulp in sequentially add copper sulphate, ammoniacal liquor, sodium thiosulfate to respectively 0.03mol/dm3、1.0mol/
dm3、0.8mol/dm3.Then with NaOH adjust pH values of pulp be 9.5,25 DEG C, air atmosphere, stir speed (S.S.) 300r/min
Under conditions of leach 12.0h, the leaching rate of gold is 67.4%, and the consumption of sodium thiosulfate is 55.46kg/tRaw material。
Embodiment 4：To in the ore pulp as described in reference examples 2, ferric sulfate is initially charged to 0.005mol/dm3, sulfosalicylic acid
Sodium is to 0.015mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding sodium thiosulfate to 1.0mol/dm3, it is used in combination
It is 10.0 that NaOH adjusts pH values of pulp, with the stirring of 400r/min under the conditions of other leaching conditions and the identical of reference examples 2
Speed leaches 24.0h, and the leaching rate of gold is 67.8%, and the consumption of sodium thiosulfate is 5.21kg/tRaw material。
Embodiment 5：To in the ore pulp as described in reference examples 2, ferric sulfate is initially charged to 0.01mol/dm3, sulfosalicylic acid
Sodium is to 0.03mol/dm3, ATS (Ammonium thiosulphate) is subsequently adding to 0.8mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be used in combination
It is 9.5 that NaOH adjusts pH values of pulp, with the stirring speed of 400r/min under the conditions of other leaching conditions and the identical of reference examples 2
Degree leaches 16.0h, and the leaching rate of gold is 68.2%, and the consumption of ATS (Ammonium thiosulphate) is 5.58kg/tRaw material。
Embodiment 6：To in the ore pulp as described in reference examples 2, ferric sulfate is initially charged to 0.02mol/dm3, sulfosalicylic acid
Sodium is to 0.06mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding sodium thiosulfate to 1.0mol/dm3, it is used in combination
It is 9.5 that NaOH adjusts pH values of pulp, with the stirring speed of 400r/min under the conditions of other leaching conditions and the identical of reference examples 2
Degree leaches 12.0h, and the leaching rate of gold is 69.0%, and the consumption of sodium thiosulfate is 5.85kg/tRaw material。
Material condition three：Calcining obtained by the oxidized roasting of certain high-sulphur and high-arsenic gold concentrate, the wherein grade of Au are 84.27g/
The content of t, S, As, Cu is respectively 1.03%, 0.55% and 0.09%.Its main mineral constituent is bloodstone and quartz.
Reference examples 3：First ore reduction, wet ball-milling to -200 mesh are accounted for into 95%, and adjust ore pulp and be to mass concentration
33%.The backward ore pulp in sequentially add copper sulphate, ammoniacal liquor, sodium thiosulfate to respectively 0.03mol/dm3、1.0mol/
dm3、0.50mol/dm3.Then with NaOH adjust pH values of pulp be 10.0,25 DEG C, air atmosphere, stir speed (S.S.) 200r/
10.0h is leached under conditions of min, the leaching rate of gold is 85.2%, the consumption of sodium thiosulfate is 36.73kg/tRaw material。
Embodiment 7：To in the ore pulp as described in reference examples 3, ferric sulfate is initially charged to 0.01mol/dm3, sulfosalicylic acid
To 0.03mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding sodium thiosulfate to 0.50mol/dm3, and use hydrogen
It is 9.0 that sodium oxide molybdena adjusts pH values of pulp, and 10.0h, the leaching rate of gold are leached under the conditions of other leaching conditions and the identical of reference examples 3
For 85.4%, the consumption of sodium thiosulfate is 4.89kg/tRaw material。
Embodiment 8：To in the ore pulp as described in reference examples 3, ferric sulfate is initially charged to 0.015mol/dm3, sulfosalicylic acid
To 0.03mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding ATS (Ammonium thiosulphate) to 0.40mol/dm3, and use hydrogen
It is 8.5 that sodium oxide molybdena adjusts pH values of pulp, and 10.0h, the leaching rate of gold are leached under the conditions of other leaching conditions and the identical of reference examples 3
For 86.6%, the consumption of ATS (Ammonium thiosulphate) is 5.19kg/tRaw material。
Embodiment 9：To in the ore pulp as described in reference examples 3, ferric sulfate is initially charged to 0.02mol/dm3, sulfosalicylic acid
To 0.04mol/dm3Replace the ammoniacal liquor and copper sulphate in reference examples, be subsequently adding ATS (Ammonium thiosulphate) to 0.50mol/dm3, and use hydrogen
It is 8.5 that sodium oxide molybdena adjusts pH values of pulp, and 8.0h, the leaching rate of gold are leached under the conditions of other leaching conditions and the identical of reference examples 3
For 87.0%, the consumption of ATS (Ammonium thiosulphate) is 5.48kg/tRaw material。
Claims (5)
1. it is a kind of catalysis Leaching of Gold Using Thiosulfate technique, it is characterised in that add sulfuric acid in Leaching of Gold Using Thiosulfate ore pulp
Iron and sulfosalicylic acid or sulfosalicylic acid sodium salt replace the addition of copper sulphate and ammoniacal liquor.
2. it is according to claim 1 to be catalyzed Leaching of Gold Using Thiosulfate technique, it is characterised in that ferric sulfate is first in ore pulp
Beginning concentration is 0.005～0.02mol/dm3；The initial concentration of sulfosalicylic acid or sulfosalicylic acid sodium salt in ore pulp be 0.01～
0.06mol/dm3。
3. it is according to claim 1 and 2 to be catalyzed Leaching of Gold Using Thiosulfate technique, it is characterised in that ferric sulfate and sulfo group water
The molar ratio range of poplar acid or sulfosalicylic acid sodium salt is 1:2～1:3.
4. it is according to claim 1 to be catalyzed Leaching of Gold Using Thiosulfate technique, it is characterised in that thiosulfate is in ore pulp
Initial concentration be 0.1～1.0mol/dm3。
5. the catalysis Leaching of Gold Using Thiosulfate technique according to any one of claim 1-4, it is characterised in that gold will be contained first
Raw material is broken, wet-milling to -200 mesh accounts for more than 90%, and regulation ore pulp to the mass concentration that adds water is 25～40%；Then toward ore pulp
A certain amount of ferric sulfate, sulfosalicylic acid or sulfosalicylic acid sodium salt are added, thiosulfate is added afterwards, and adjusted with NaOH
PH values of pulp is saved to 8.0～10.0；It is last that gold is soaked under conditions of air atmosphere, 0～45 DEG C, 100～300r/min of stir speed (S.S.)
6.0～24.0h.
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| CN201611257286.7A CN106636634B (en) | 2016-12-30 | 2016-12-30 | A kind of technique for being catalyzed Leaching of Gold Using Thiosulfate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205499A (en) * | 2019-05-22 | 2019-09-06 | 东北大学 | A kind of composite sulfur hydrochlorate catalytic citric acid-Leaching of Gold Using Thiosulfate technique |
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2016
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| CN103409623A (en) * | 2013-07-26 | 2013-11-27 | 中南大学 | Method for reducing consumption of thiosulfate in gold leaching system |
| CN104789792A (en) * | 2015-05-07 | 2015-07-22 | 中南大学 | Process of nickel citrate for catalyzing thiosulfate to leach gold |
| CN105603185A (en) * | 2016-01-12 | 2016-05-25 | 中南大学 | Thiosulfate gold leaching method using cobalt and ethylene diamine tetraacetic acid (EDTA) as catalysts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205499A (en) * | 2019-05-22 | 2019-09-06 | 东北大学 | A kind of composite sulfur hydrochlorate catalytic citric acid-Leaching of Gold Using Thiosulfate technique |
| CN110205499B (en) * | 2019-05-22 | 2020-08-07 | 东北大学 | Composite sulfate catalyzed citric acid-thiosulfate gold leaching process |
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