CN103409623A - Method for reducing consumption of thiosulfate in gold leaching system - Google Patents
Method for reducing consumption of thiosulfate in gold leaching system Download PDFInfo
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- CN103409623A CN103409623A CN2013103200804A CN201310320080A CN103409623A CN 103409623 A CN103409623 A CN 103409623A CN 2013103200804 A CN2013103200804 A CN 2013103200804A CN 201310320080 A CN201310320080 A CN 201310320080A CN 103409623 A CN103409623 A CN 103409623A
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- gold
- thiosulfate
- leaching
- ammonia
- copper
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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
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Abstract
The invention provides a method for reducing consumption of thiosulfate in a gold leaching system. According to the method, the additive is humic acid extracted from coal and adopting fulvic acid , and humin acid as main components; during application, the humic acid is added into a copper-ammonia-thiosulfate system, wherein the adding amount of the humic acid is in the range of 20-120 mg/dm3, preferably 80mg / L, the copper-ammonia-thiosulfate system comprises 0.01-0.05mol/dm<3> of copper (II) ion, 0.3-2mol/dm <3> of aqua ammonia and 0.3-1mol/dm <3> of thiosulfate, and the pH value of pulp is 10-11. By using the leaching solution (namely the copper-ammonia-thiosulfate) to extract gold from ore, the consumption of the thiosulfate can be remarkably reduced on the premise of not affecting the leaching rate of gold.
Description
Technical field
The invention belongs to technical field of wet metallurgy, relate to a kind of thiosulfate gold extracting processing method, relate to more specifically a kind of reduction and soak the method that in golden system, thiosulphate consumes.
Background technology
Cyanide process is the main method extracted gold from present, yet the sodium cyanide used in cyanide process technique is hypertoxic pharmaceutical chemicals, very dangerous for the operator, may cause serious environmental problem simultaneously.In recent years, from the security standpoint that people-oriented with to the attention increasingly of environmental problem, some countries and regions have forbidden using prussiate in gold extracts along with various countries.And to difficult-treating gold mine, the leaching effect of cyanide process is poor, therefore, non-extraction of gold by cyanidation becomes popular research field day by day.
In the non-cyanidation gold technology, thiosulphate is quick with it, nontoxic, efficient, insensitive and leach the index high and be considered to replace the most promising method of cyanide process to impurity.In the thiosulfate gold extracting studying technological domain to having carried out, the Leaching Systems of relatively generally acknowledging at present is copper-ammonia-thiosulfuric acid salt system.Yet thiosulphate is unstable, easily oxygenolysis, cause leaching high expensive, is difficult to realize suitability for industrialized production.
At the commitment of thiosulfate gold extracting, the Kerley of the U.S. has set up the technique of ammoniac thiosulfate leaching difficult-treating gold mine, and this technique has been used additive sulphite, as the stablizer of thiosulphate, and S in basic solution
2O
3 2-Disproportionation reaction easily occurs:
3S
2O
3 2-+6OH
-=4SO
3 2-+2S
2-+3H
2O
So SO
3 2-Existence can suppress S
2O
3 2-Decomposition, main leaching condition is the 1.2mol/L ammonium thiosulfate, 1～4g/LCu (II)>0.05%, the add-on of sulphite is 0.1～2%, the pH of ore pulp>7.5.But SO
3 2-Itself be exactly a unsettled material, can be oxidized to sulfate radical in leaching process.So it is bad to stablize the effect of thiosulphate, fundamentally do not solve the problem of reagent exorbitant expenditure.
In recent years, the people such as Hu Xianzhi find to using the polyamine compounds such as quadrol, diethylenetriamine, triethylene tetramine and the additive of cupric ion formation complex compound as the thiosulfate gold extracting technology, have and reduce the effect that thiosulphate consumes, it is by cupric ion and polyamines, to generate stable polyamines to close the copper coordination ion, as the oxygenant in the thiosulfate gold extracting process.Adopt the additive of polyamines class by the consumption of thiosulphate from 20～30kg/t, to be reduced to the 5kg/t ore.But than copper-ammonia-Leaching of Gold Using Thiosulfate system, polyamines-copper-Leaching of Gold Using Thiosulfate system can affect golden leaching yield.In roasting-thiosulfate leaching experiment, the leaching yield of copper-ammonia-thiosulfuric acid salt system can reach 89.7% to certain arsenic-containing gold ore, if adopt quadrol to replace ammoniacal liquor, the maximum leaching yield of gold reaches 86.5%.
Based on above present Research, the present invention proposes is not a kind ofly increasing production cost, does not affect under the prerequisite of gold leaching rate, significantly reduces the method that thiosulphate consumes.
Summary of the invention
The objective of the invention is, for copper-ammonia-Leaching of Gold Using Thiosulfate system large problem of thiosulphate consumption in leaching process, provides a kind of and has guaranteed under the prerequisite that does not affect gold leaching rate, significantly reduces the method that thiosulphate consumes.
In order to realize above purpose, technical scheme of the present invention is:
The method that golden system thiosulphate consumes is soaked in a kind of reduction, adds humic acid as additive in copper-ammonia-Leaching of Gold Using Thiosulfate system.
Specifically in copper-ammonia-Leaching of Gold Using Thiosulfate system, adding the amount of humic acid is 20～120mg/dm
3Ore pulp.
Described copper-ammonia-Leaching of Gold Using Thiosulfate system is the ore pulp that comprises following component: bivalent cupric ion 0.01～0.05mol/dm
3, ammoniacal liquor 0.3～2mol/dm
3, thiosulphate 0.3～1mol/dm
3The pH of ore pulp is 10～11.
Described thiosulphate comprises Sulfothiorine or ammonium thiosulfate.
In aforesaid method, gold mine wet-milling to-200 orders account for more than 90%, and soaking gold mine slurry concentration is 25～55%, and stirring velocity is rotating speed 180-220r/min, agitation leach at least 4 hours.
In aforesaid method, the gold mine that uses comprises gold ore, sulfur-bearing arsenic gold concentrate calcining or oxidation gold mine.
Aforesaid method is preferred: the gold mine wet-milling accounts for more than 90% to-200 orders, adds water and regulates that to soak gold mine slurry concentration be 33～37%, adds bivalent cupric ion concentration to 0.03mol/dm
3, adding ammonia concn is 0.45mol/dm
3, adding concentration of sodium thiosulfate is 0.3mol/dm
3The pH of ore pulp is 10; The amount that adds humic acid is 80mg/dm
3Stirring velocity is rotating speed 200r/min, agitation leach 4 hours.
Method of the present invention is applicable to all kinds of gold mines, for difficult-treating gold mines such as high-As and high-Ss, carry in golden process in routine, the consumption of thiosulphate is 50～60kg/t nearly, and after adopting the inventive method to add humic acids, the thiosulphate consumption can be down to below 21.6kg/t.And humic acids is cheap, consumption is also little, and compared to other additive, cost is lower, and efficiency is higher.
Use method of the present invention, be up to 79.6% for the gold leaching rate of the difficult-treating gold mines such as high-As and high-S, the gold leaching rate of oxidation gold mine is up to 96.5%; And be not less than existing technique, and technological operation of the present invention is simple, is easy to control, and the thiosulphate consumption is low, is applicable to various gold mines.The whole toxic substances such as not using sodium cyanide of carrying in golden process, do not discharge Toxic waste yet, environmentally friendly.
The method that the present invention uses, the leach liquor composition is simple, is conducive to carry recycling of the rear leach liquor of gold, and recycling of leach liquor only needs to add a small amount of thiosulphate, makes the concentration of thiosulphate reach initial level.
Embodiment
Below in conjunction with embodiment, further illustrate the present invention, and unrestricted the present invention.
Material condition: certain high-As and high-S gold mine removes sulphur and the resulting gold ore calcining of arsenic in this gold ore through the oxidizing roasting pre-treatment, and gold content is 84.27g/t, and silver content is 13.55g/t, and main gangue content is SiO
2.
Other conditions: the ore reduction wet-milling is accounted for to 90% to fineness-200 order, and it is 37% that water is regulated pulp density.
Reference examples: in above-mentioned ore pulp, add copper (II) ion 0.03mol/dm
3, add ammoniacal liquor to 0.45mol/dm
3, add thiosulphate 0.3mol/dm
3, the pH that regulates ore pulp is 10, agitation leach 4 hours, and the leaching yield of gold is 78.0%, the consumption of thiosulphate is 44.7kg/t.
Embodiment 1: add humic acid 20mg/dm in the ore pulp of above-mentioned reference examples
3, agitation leach 4 hours, the leaching yield of gold is 77.6%, the Sulfothiorine consumption is reduced to the 18kg/t ore.
Embodiment 2: add humic acid 40mg/dm in the ore pulp of above-mentioned reference examples
3, agitation leach 4 hours, the leaching yield of gold is 78.1%, the Sulfothiorine consumption is reduced to the 18.7kg/t ore.
Embodiment 3: add humic acid 60mg/dm in the ore pulp of above-mentioned reference examples
3, agitation leach 4 hours, the leaching yield of gold is 78.8%, the Sulfothiorine consumption is reduced to the 21.6kg/t ore.
Embodiment 4: add humic acid 80mg/dm in the ore pulp of above-mentioned reference examples
3, agitation leach 4 hours, the leaching yield of gold is 79.6%, the Sulfothiorine consumption is reduced to the 22.1kg/t ore.
Embodiment 5: add humic acid 120mg/dm in the ore pulp of above-mentioned reference examples
3, agitation leach 4 hours, must contain golden leach liquor, and measuring golden leaching yield is 79%, and the Sulfothiorine consumption is reduced to the 22.6kg/t ore.
Embodiment 6: to certain oxidation gold mine, gold content is 68.65g/t, and main gangue mineral is quartzy, and the ore reduction wet-milling is accounted for to 90% to fineness-200 order, and it is 33% that water is regulated pulp density.In above-mentioned ore pulp, add humic acid 80mg/L, add copper (II) ion 0.03mol/dm
3, add ammoniacal liquor to 0.45mol/dm
3, add thiosulphate 0.3mol/dm
3, the pH that regulates ore pulp is 10, agitation leach 4 hours, and the leaching yield of gold is 96.5%, the consumption of thiosulphate is reduced to 19.8kg/t.
Claims (7)
1. the method that golden system thiosulphate consumes is soaked in a reduction, it is characterized in that, adds humic acid as additive in copper-ammonia-Leaching of Gold Using Thiosulfate system.
2. method according to claim 1, is characterized in that, the amount that adds humic acid in copper-ammonia-Leaching of Gold Using Thiosulfate system is 20～120mg/dm
3Ore pulp.
3. method according to claim 2, is characterized in that, described copper-ammonia-Leaching of Gold Using Thiosulfate system is the ore pulp that comprises following component: bivalent cupric ion 0.01～0.05mol/dm
3, ammoniacal liquor 0.3～2mol/dm
3, thiosulphate 0.3～1mol/dm
3The pH of ore pulp is 10～11.
4. method according to claim 3, is characterized in that, described thiosulphate comprises Sulfothiorine or ammonium thiosulfate.
5. method according to claim 3, is characterized in that, gold mine wet-milling to-200 orders account for more than 90%, and soaking gold mine slurry concentration is 25～55%, and stirring velocity is rotating speed 180-220r/min, agitation leach at least 4 hours.
6. method according to claim 1, is characterized in that, the gold mine that uses comprises gold ore, sulfur-bearing arsenic gold concentrate calcining or oxidation gold mine.
7. according to the described method of claim 1-6 any one, it is characterized in that, the gold mine wet-milling accounts for more than 90% to-200 orders, adds water and regulates that to soak gold mine slurry concentration be 33～37%, adds bivalent cupric ion concentration to 0.03mol/dm
3, adding ammonia concn is 0.45mol/dm
3, adding concentration of sodium thiosulfate is 0.3mol/dm
3The pH of ore pulp is 10; The amount that adds humic acid is 80mg/dm
3Stirring velocity is rotating speed 200r/min, agitation leach 4 hours.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789792A (en) * | 2015-05-07 | 2015-07-22 | 中南大学 | Process of nickel citrate for catalyzing thiosulfate to leach gold |
| CN104805281A (en) * | 2015-05-05 | 2015-07-29 | 中南大学 | Method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching |
| CN104805285A (en) * | 2015-05-05 | 2015-07-29 | 中南大学 | Method for leaching gold by virtue of thiosulfate utilizing ammonium alcohol polyvinyl phosphate as additive |
| CN105344485A (en) * | 2015-10-16 | 2016-02-24 | 中南大学 | Method for recycling gold and interlocked mass of gold from refractory gold ore based on sulfur-oil aggregative flotation |
| CN105441677A (en) * | 2016-01-13 | 2016-03-30 | 南京信息工程大学 | Method utilizing by-product ammonium thiosulfate for leaching precious metal from flotation concentrate |
| CN105543495A (en) * | 2014-11-04 | 2016-05-04 | 杨毓华 | Novel environmentally-friendly gold extraction agent |
| CN105624420A (en) * | 2016-01-12 | 2016-06-01 | 中南大学 | Method for leaching gold by thiosulfate through cobalt and ammonia catalysis |
| CN105734281A (en) * | 2014-12-09 | 2016-07-06 | 河南绿金矿业科技有限公司 | Environment-friendly compound precious metal leaching agent and preparation method thereof |
| CN105803220A (en) * | 2016-04-28 | 2016-07-27 | 长春黄金研究院 | Method for reducing thiosulfate consumption quantity |
| CN106636634A (en) * | 2016-12-30 | 2017-05-10 | 中南大学 | Technology for catalyzing thiosulfate to leach gold |
| CN109680163A (en) * | 2019-01-14 | 2019-04-26 | 东北大学 | A method of using triethanolamine as the Leaching of Gold Using Thiosulfate of additive |
| CN109957664A (en) * | 2019-04-11 | 2019-07-02 | 西部黄金(克拉玛依)矿业科技有限责任公司 | A kind of environmental protection proposes golden agent and preparation method thereof |
| CN111471858A (en) * | 2020-06-15 | 2020-07-31 | 矿冶科技集团有限公司 | Thiosulfate gold leaching method and application |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543495A (en) * | 2014-11-04 | 2016-05-04 | 杨毓华 | Novel environmentally-friendly gold extraction agent |
| CN105734281A (en) * | 2014-12-09 | 2016-07-06 | 河南绿金矿业科技有限公司 | Environment-friendly compound precious metal leaching agent and preparation method thereof |
| CN104805281A (en) * | 2015-05-05 | 2015-07-29 | 中南大学 | Method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching |
| CN104805285A (en) * | 2015-05-05 | 2015-07-29 | 中南大学 | Method for leaching gold by virtue of thiosulfate utilizing ammonium alcohol polyvinyl phosphate as additive |
| CN104805285B (en) * | 2015-05-05 | 2017-04-12 | 中南大学 | Method for leaching gold by virtue of thiosulfate utilizing ammonium alcohol polyvinyl phosphate as additive |
| CN104789792A (en) * | 2015-05-07 | 2015-07-22 | 中南大学 | Process of nickel citrate for catalyzing thiosulfate to leach gold |
| CN105344485A (en) * | 2015-10-16 | 2016-02-24 | 中南大学 | Method for recycling gold and interlocked mass of gold from refractory gold ore based on sulfur-oil aggregative flotation |
| CN105344485B (en) * | 2015-10-16 | 2018-03-02 | 中南大学 | The method for reclaiming gold and its intergrowth from difficult-treating gold mine based on sulphur oil aggregative flotation |
| CN105624420A (en) * | 2016-01-12 | 2016-06-01 | 中南大学 | Method for leaching gold by thiosulfate through cobalt and ammonia catalysis |
| CN105441677A (en) * | 2016-01-13 | 2016-03-30 | 南京信息工程大学 | Method utilizing by-product ammonium thiosulfate for leaching precious metal from flotation concentrate |
| CN105803220A (en) * | 2016-04-28 | 2016-07-27 | 长春黄金研究院 | Method for reducing thiosulfate consumption quantity |
| CN106636634A (en) * | 2016-12-30 | 2017-05-10 | 中南大学 | Technology for catalyzing thiosulfate to leach gold |
| CN109680163A (en) * | 2019-01-14 | 2019-04-26 | 东北大学 | A method of using triethanolamine as the Leaching of Gold Using Thiosulfate of additive |
| CN109957664A (en) * | 2019-04-11 | 2019-07-02 | 西部黄金(克拉玛依)矿业科技有限责任公司 | A kind of environmental protection proposes golden agent and preparation method thereof |
| CN111471858A (en) * | 2020-06-15 | 2020-07-31 | 矿冶科技集团有限公司 | Thiosulfate gold leaching method and application |
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Application publication date: 20131127 |