CN100485055C - Method for leaching gold mine by electrochemistry oxidation method - Google Patents
Method for leaching gold mine by electrochemistry oxidation method Download PDFInfo
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- CN100485055C CN100485055C CNB2007100373929A CN200710037392A CN100485055C CN 100485055 C CN100485055 C CN 100485055C CN B2007100373929 A CNB2007100373929 A CN B2007100373929A CN 200710037392 A CN200710037392 A CN 200710037392A CN 100485055 C CN100485055 C CN 100485055C
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- gold
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- oxidant
- anolyte compartment
- sodium chloride
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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
Abstract
The invention is a method of extracting refractory gold ore by electrochemical oxidation method. The method includes: producing two powerful oxidant at cathode and anode by cheap material sodium chloride and sodium hydroxide and disposing the refractory gold ore at one time, reacting the circular pulp and two powerful oxidant produced by cathode and anode so as to improve the efficiency of electrochemistry synthesizing oxidant and enhance the gold extraction ratio. The invention improves the production efficiency of the oxidant and oxidative efficiency of the pulp, avoids the oxidant transportation danger and high cost in the chemical oxidation method. The material is innocuous and cheap and the inventive method is better than liquid chlorine method and common cyanidation, reduces the pollution.
Description
Technical field
The present invention relates to a kind of electrochemical method and handle the method in indissoluble gold ore deposit.
Technical background
Along with the development and use of gold Mineral resources, easily to handle gold ore resource and reduce day by day, the utilization of refractory gold ore seems more and more important.It is reported that the reserves of gold account for 60% of gold total reserves in the refractory gold ore in the world.According to the preliminary statistics, in the explored gold reserve of China, have 30% to be difficult-treating gold mine, the golden reserves of various difficult-treating gold mines are about 700t, and prospective reserves is more than 1000t.But from refractory gold ore, carry gold and be considered to " a universally acknowledged difficult problem ".In this class ore, gold often is microfine and is wrapped in the ore particle that is difficult for infiltration; The gold that has is " invisible gold " state and is present in sulphide ores lattice or the microcrystalline quartz, perhaps is adsorbed in clay, hydromica etc. with colloidal particle and carries in the gold mineral.The same carbonaceous that contains the nature existence often etc. causes the component of " robbing gold " effect, makes the dressing and smelting process of refractory gold ore complicated.Because selecting and smelting technology is not broken through as yet fully, cause the gold resource that is worth nearly hundred billion yuan not develop.As seen, the accelerate development difficult-treating gold mine is of great practical significance.
The method of indissoluble gold ore deposit leaching at present mainly can be summed up as cyanide process and non-cyanide process two big classes.But in cyanide process, because sulphide ores generally all is densification and water insoluble, during cyaniding, oxygen can't contact with gold with cryanide ion; A large amount of sulphur and arsenic preferential and oxygen and cryanide ion reaction consume a large amount of cryanide ions, not only cause the high of cost, and resultant can hinder the cyaniding of gold at goldc grains surface formation passive film.So, generally before cyaniding, carry out pre-treatment, but the prussiate that this method is used there is severe toxicity, this is the fatal shortcoming of this method.In non-cyanide process, chemical oxidization method soaks the general method that adds strong acid, strong oxidizer that adopts of gold and leaches gold.The leaching effect of this method gold is better, but required strong acid, strong oxidizer consumption are big, and Financial cost is too high.So adopting cheap raw material to generate oxygenant in-situ treatment indissoluble gold ore deposit with electrochemical method is a kind of good outlet that chemical oxidization method is handled gold mine.
According to the characteristics of above method, the present invention has designed the method that generates clorox and two kinds of oxygenants of dioxide peroxide and in-situ treatment indissoluble gold ore deposit by electrochemical method simultaneously.The advantages of nontoxic raw materials that this method adopts, and cheap and easy to get is compared with other method and to be had clear superiority.
Summary of the invention
The present invention is intended to generate two kinds of strong oxidizers and in-situ treatment indissoluble gold ore deposit simultaneously at negative and positive the two poles of the earth with electrochemical method.Utilize cheap raw material sodium-chlor, hydrochloric acid and sodium chlorate to generate two kinds of strong oxidizers respectively at negative and positive the two poles of the earth and also handle the indissoluble gold ore deposit simultaneously, two kinds of strong oxidizers that generate by round-robin ore pulp and chamber, negative and positive the two poles of the earth in time react, thereby improve the efficient of electrochemical synthesis oxygenant, also increase the leaching yield of gold simultaneously.
The present invention is by allowing ore pulp circulation and electrolysate anolyte compartment product clorox strong oxidizer and cathode compartment product dioxide peroxide strong oxidizer in time react under the power of pump.Add the ore pulp feed liquid that sodium chloride solution and breeze are formed in the anolyte compartment, sodium chloride concentration is 80g/L-150g/L, the feed liquid H of anolyte compartment
+Concentration is 0.3mol/L-0.5mol/L, and anolyte compartment's solid-to-liquid ratio is 1:10-1:20, and anodic current density is 0.3A/cm
2-0.4A/cm
2, the chlorine that generates in anolyte compartment's electrolysis is dissolved in and generates clorox and hydrochloric acid in the sodium chloride solution, and clorox continuous round-robin ore pulp of oxidation on the spot under acidic conditions leaches gold.
Add sodium chlorate and hydrochloric acid soln at cathode compartment, density of sodium chlorate is 0.2mol/L-0.4mol/L, concentration of hydrochloric acid 16%～20%, and the cathode compartment solid-to-liquid ratio is 1:10-1:20, cathode compartment electrolysate dioxide peroxide continuous round-robin ore pulp of oxidation on the spot under acidic conditions leaches gold.
Electrolysis time is 8h-24h, and the gold mine granularity is 160 orders-200 orders, and the leaching yield of gold can reach more than 90%.
Beneficial effect: this method has overcome some shortcomings that exist in the existing gold mine treatment process.Generate two kinds of oxygenants simultaneously respectively and original position is used for handling the indissoluble gold ore deposit with electrochemical method, directly leach the gold in the indissoluble gold ore deposit.The electrolysate strong oxidizer has improved the efficient of generation oxygenant and the oxidation efficiency of ore pulp by in time reacting with ore pulp.This method has been avoided transporting the dangerous and high problem of production cost with the industrial production oxygenant in the chemical oxidization method, and is raw materials used nontoxic, cheap and easy to get, compared remarkable advantages with the liquid chlorine method, compares with cyanide process commonly used, reduced environmental pollution.
Embodiment
Use present method to handle and contain the indissoluble gold ore deposit of gold, the leaching yield such as the table 1 of gold under different technical parameters as 22g/t:
| Sodium chloride concentration degree (g/L) | H +Concentration degree (mol/ L) | Density of sodium chlorate degree (mol/ L) | The anode solid-to-liquid ratio | The negative electrode solid-to-liquid ratio | Gold mine granularity (order) | Anodic current density (A/ cm 2) | Time (h) | The leaching yield of anode gold (%) | The leaching yield of negative electrode gold (%) |
| 80 | 0.3 | 0.2 | 1：10 | 1∶10 | 160 | 0.3 | 8 | 70 | 50 |
| 100 | 0.3 | 0.3 | 1：15 | 1∶15 | 160 | 0.3 | 10 | 89 | 72 |
| 150 | 0.4 | 0.4 | 1：20 | 1∶20 | 200 | 0.4 | 16 | 94 | 83 |
| 200 | 0.5 | 0.4 | 1：20 | 1∶20 | 200 | 0.4 | 24 | 98 | 93 |
Claims (3)
1. the method for a leaching gold mine by electrochemistry oxidation method is characterized in that: in time react with anolyte compartment's product clorox strong oxidizer and cathode compartment product dioxide peroxide strong oxidizer by the circulation of gold mine slurry, gold is leached; Add the ore pulp feed liquid that sodium chloride solution and breeze are formed in the anolyte compartment, sodium chloride concentration is 80g/L-150g/L, the feed liquid H of anolyte compartment
+Concentration is 0.3mol/L-0.5mol/L, anolyte compartment's solid-to-liquid ratio is 1:10-1:20, the chlorine that generates in anolyte compartment's electrolysis is dissolved in and generates clorox and hydrochloric acid in the sodium chloride solution, and clorox continuous round-robin ore pulp of oxidation on the spot under acidic conditions leaches gold; Add sodium chlorate and hydrochloric acid soln at cathode compartment, density of sodium chlorate is 0.2mol/L-0.4mol/L, concentration of hydrochloric acid 16%～20%, and the cathode compartment solid-to-liquid ratio is 1:10-1:20, cathode compartment electrolysate dioxide peroxide continuous round-robin ore pulp of oxidation on the spot under acidic conditions leaches gold; Electrolysis time is 8h-24h.
2. the method for claim 1 is characterized in that, the gold mine granularity is 160 orders-200 orders.
3. method as claimed in claim 1 or 2 is characterized in that, anodic current density is 0.3A/cm
2-0.4A/cm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100373929A CN100485055C (en) | 2007-02-09 | 2007-02-09 | Method for leaching gold mine by electrochemistry oxidation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100373929A CN100485055C (en) | 2007-02-09 | 2007-02-09 | Method for leaching gold mine by electrochemistry oxidation method |
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| Publication Number | Publication Date |
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| CN101054623A CN101054623A (en) | 2007-10-17 |
| CN100485055C true CN100485055C (en) | 2009-05-06 |
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| CNB2007100373929A Expired - Fee Related CN100485055C (en) | 2007-02-09 | 2007-02-09 | Method for leaching gold mine by electrochemistry oxidation method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203762A (en) * | 2016-12-19 | 2018-06-26 | 南京工业大学 | A kind of method that noble metal gold efficient-decomposition leaches in waste printed circuit board |
| CN108103310B (en) * | 2018-01-22 | 2020-03-31 | 东北大学 | Chlorine dioxide pre-oxidation method for sulfur-containing gold ore |
| CN114058867A (en) * | 2021-10-29 | 2022-02-18 | 上海逢石科技有限公司 | Chlorine dioxide gold leaching method for preparing leaching agent in ore pulp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984000563A1 (en) * | 1982-08-05 | 1984-02-16 | Dextec Metallurg | Recovery of silver and gold from ores and concentrates |
| US4904358A (en) * | 1988-02-16 | 1990-02-27 | Inland Aqua-Tech Co., Inc. | Gold and silver recovery processes by electrolytic generation of active bromine |
| WO2001083835A2 (en) * | 2000-04-28 | 2001-11-08 | Mintek | Gold recovery process with hydrochloric acid lixiviant |
| KR20040057008A (en) * | 2002-12-24 | 2004-07-01 | (주)엘켐텍 | Electrolytic waste treatment system |
-
2007
- 2007-02-09 CN CNB2007100373929A patent/CN100485055C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984000563A1 (en) * | 1982-08-05 | 1984-02-16 | Dextec Metallurg | Recovery of silver and gold from ores and concentrates |
| US4904358A (en) * | 1988-02-16 | 1990-02-27 | Inland Aqua-Tech Co., Inc. | Gold and silver recovery processes by electrolytic generation of active bromine |
| WO2001083835A2 (en) * | 2000-04-28 | 2001-11-08 | Mintek | Gold recovery process with hydrochloric acid lixiviant |
| KR20040057008A (en) * | 2002-12-24 | 2004-07-01 | (주)엘켐텍 | Electrolytic waste treatment system |
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| CN101054623A (en) | 2007-10-17 |
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