CN111647743A - Gold and silver mineral leaching combined medicament and preparation method thereof - Google Patents
Gold and silver mineral leaching combined medicament and preparation method thereof Download PDFInfo
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- CN111647743A CN111647743A CN202010348657.2A CN202010348657A CN111647743A CN 111647743 A CN111647743 A CN 111647743A CN 202010348657 A CN202010348657 A CN 202010348657A CN 111647743 A CN111647743 A CN 111647743A
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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
- C22B3/14—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions containing ammonia or ammonium salts
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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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
A gold and silver mineral leaching combined medicament and a preparation method thereof are prepared from the following raw materials in parts by weight: 2-6 parts of sodium thiosulfate; 0.5-2 parts of ammonia water; 1-3 parts of 1-butyl-3-methylimidazolium chloride; 0.5-1.0 of sodium sulfate; the preparation method comprises the following steps: adding 1-butyl-3-methylimidazole chloride salt into water, stirring for 4-6min, adding the leached ore sample, stirring for 20-40min, then adding ammonia water, stirring for 20-40min, finally adding sodium thiosulfate and sodium sulfate, and stirring until leaching is finished. The combined leaching agent and the application provided by the invention have the advantages of high leaching rate of gold and silver, good selectivity, simple preparation process and strong adaptability.
Description
Technical Field
The invention relates to the field of beneficiation hydrometallurgy, and particularly relates to a leaching combined reagent for gold and silver minerals and a preparation method thereof.
Background
The chemical leaching method is always the main method for recovering gold and silver, and according to different leaching agents, the currently researched leaching methods include cyanidation leaching method, thiosulfate leaching method, halide leaching method, thiocyanate leaching method, polysulfide leaching method, nitric acid leaching method, thiourea leaching method and the like. The cyaniding leaching method is a common method for treating gold and silver mineral raw materials at home and abroad due to the advantages of good economic benefit, simple operation, high leaching rate and the like, but the cyanide is extremely toxic and has great environmental hazard, and the thiosulfate attracts people's attention as a safe and efficient leaching agent for nearly 40 years and is known as a non-cyanogen leaching agent with a relatively promising prospect.
The thiosulfate leaching method for leaching gold and silver is generally carried out in a cuprammonium system or an acid system, and the two systems respectively have own defects: 1. when the copper ammonia thiosulfate system is leached, the influence of the concentration of copper ions on the leaching rate of gold and silver is large, and the gold and silver leaching is not influenced by overhigh or overlow concentration of copper ions, particularly when the copper content of the mineral is high, the leaching process is difficult to control, and the leaching rate of gold and silver is low; 2. when the acid thiosulfate leaching system is used for leaching, the selectivity is poor, and metals in all sulfides except gold and silver can be extracted.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a gold and silver mineral leaching combined reagent and a preparation method thereof, wherein the gold and silver mineral leaching combined reagent has the advantages of high gold and silver leaching rate, good selectivity, simple preparation process and strong adaptability.
The invention relates to a gold and silver mineral leaching combined agent which is characterized by being prepared from the following raw materials in parts by weight: 2-6 parts of sodium thiosulfate; 0.5-2 parts of ammonia water; 1-3 parts of 1-butyl-3-methylimidazolium chloride; 0.5-1.0 of sodium sulfate; the preparation method comprises the following steps: adding 1-butyl-3-methylimidazole chloride salt into water, stirring for 4-6min, adding the leached ore sample, stirring for 20-40min, then adding ammonia water, stirring for 20-40min, finally adding sodium thiosulfate and sodium sulfate, and stirring until leaching is finished.
In the technical scheme of the leaching combined medicament for the gold and silver minerals, the further preferable technical scheme is characterized in that:
1. the feed is prepared from the following raw materials in parts by weight: sodium thiosulfate 2; 0.5 of ammonia water; 1-butyl-3-methylimidazolium chloride salt; 0.5 of sodium sulfate;
2. the feed is prepared from the following raw materials in parts by weight: sodium thiosulfate 6; 2, ammonia water; 1-butyl-3-methylimidazolium chloride salt 3; 1.0 part of sodium sulfate;
3. the feed is prepared from the following raw materials in parts by weight: sodium thiosulfate 4; 1.5 parts of ammonia water; 1-butyl-3-methylimidazolium chloride salt 3; 0.6 of sodium sulfate;
4. the feed is prepared from the following raw materials in parts by weight: sodium thiosulfate 6; 2, ammonia water; 1.5 parts of 1-butyl-3-methylimidazolium chloride; 0.6 of sodium sulfate;
5. the feed is prepared from the following raw materials in parts by weight: sodium thiosulfate 3; 1, ammonia water; 1-butyl-3-methylimidazolium chloride salt; sodium sulfate 1;
6. adding the 1-butyl-3-methylimidazole chloride salt and ammonia water at one time according to the dosage, adding the sodium thiosulfate and the sodium sulfate in the leaching process for 3 times, adding 2/1 with the required dosage for the first time, and adding 1/4 with the required dosage for the last two times;
7. the stirring time for adding the 1-butyl-3-methylimidazole chlorine salt is 5 min; adding the leached ore sample, and stirring for 30 min; then, ammonia was added thereto and the stirring time was 30 min.
Compared with the prior art, the invention has the beneficial effects that: the gold (silver) oxide-containing silver oxide consists of four medicaments, namely sodium thiosulfate, ammonia water, 1-butyl-3+(Ag+) Speed of (1), Cl-With NH in the ammonia3Diffuse to the surface of gold and silver minerals and Au+(Ag+) Reaction to AuNH3Cl(AgNH3Cl) complex with subsequent addition of S in sodium thiosulfate2O3 2-The reaction produces stable Au (S)2O3)2 3-(Ag(S2O3)2 3-) The leaching of the actual cash (silver) is realized, and the sodium sulfate can reduce S2O3 2-Is oxidized into SO3 2-Or SO4 2-At a speed of, increasing S2O3 2-Thereby increasing the S content in the immersion liquid2O3 2-The concentration of the sodium thiosulfate can achieve the purpose of reducing the dosage of the sodium thiosulfate. In addition, the addition of sodium thiosulfate and sodium sulfate in several times further reduces S to a certain extent2O3 2-The rate of oxidation. The combined leaching agent and the application provided by the invention have the advantages of high leaching rate of gold and silver, good selectivity, simple preparation process and strong adaptability.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, a leaching combination agent for gold and silver minerals is prepared from the following raw materials in parts by weight: 2-6 parts of sodium thiosulfate; 0.5-2 parts of ammonia water; 1-3 parts of 1-butyl-3-methylimidazolium chloride; 0.5-1.0 of sodium sulfate; the preparation method comprises the following steps: adding 1-butyl-3-methylimidazole chloride salt into water, stirring for 4-6min, adding the leached ore sample, stirring for 20-40min, then adding ammonia water, stirring for 20-40min, finally adding sodium thiosulfate and sodium sulfate, and stirring until leaching is finished.
Embodiment 2, the gold and silver mineral leaching combined agent and the preparation method thereof according to embodiment 1 are prepared from the following raw materials in parts by weight: sodium thiosulfate 2; 0.5 of ammonia water; 1-butyl-3-methylimidazolium chloride salt; sodium sulfate 0.5.
Embodiment 3, the gold and silver mineral leaching combined agent and the preparation method thereof according to embodiment 1 or 2 are prepared from the following raw materials in parts by weight: sodium thiosulfate 6; 2, ammonia water; 1-butyl-3-methylimidazolium chloride salt 3; sodium sulfate 1.0.
Embodiment 4, the gold and silver mineral leaching combined agent and the preparation method thereof according to embodiment 1, 2 or 3 are prepared from the following raw materials in parts by weight: sodium thiosulfate 4; 1.5 parts of ammonia water; 1-butyl-3-methylimidazolium chloride salt 3; sodium sulfate 0.6.
Embodiment 5, the gold and silver mineral leaching combined agent and the preparation method thereof according to any one of embodiments 1 to 4 are prepared from the following raw materials in parts by weight: sodium thiosulfate 6; 2, ammonia water; 1.5 parts of 1-butyl-3-methylimidazolium chloride; sodium sulfate 0.6.
Embodiment 6, the gold and silver mineral leaching combined agent and the preparation method thereof according to any one of embodiments 1 to 5 are prepared from the following raw materials in parts by weight: sodium thiosulfate 3; 1, ammonia water; 1-butyl-3-methylimidazolium chloride salt; sodium sulfate 1.
Example 7, the leaching combination of gold and silver minerals and the preparation method thereof according to any one of examples 1 to 6, wherein the 1-butyl-3-methylimidazolium chloride and ammonia water are added at one time, and the sodium thiosulfate and sodium sulfate are added in 3 times during the leaching process, wherein 2/1 with the required amount is added at the first time, and 1/4 with the required amount is added at the last two times.
Embodiment 8, the gold and silver mineral leaching combined agent and the preparation method thereof according to any one of embodiments 1 to 7, wherein the stirring time for adding the 1-butyl-3-methylimidazolium chloride is 5 min; adding the leached ore sample, and stirring for 30 min; then, ammonia was added thereto and the stirring time was 30 min.
Example 9, the test sample was a primary sulfide ore, the metal minerals were mainly pyrite, sphalerite, chalcopyrite, the gold minerals were mainly natural gold and gold-silver minerals, the silver minerals were mostly natural silver, these gold-silver minerals were mainly present in chalcopyrite and pyrite, and the gold and silver grades were 5.31g/t and 113g/t, respectively.
The leaching process of the gold and silver of the ore sample comprises the following steps:
1. preparing a combined leaching agent raw material: respectively weighing 1.5g of ammonia water and 3g of 1-butyl-3-methylimidazole chloride salt, placing the ammonia water and the 1-butyl-3-methylimidazole chloride salt in different beakers for later use, and then respectively weighing three parts of a mixture of sodium thiosulfate and sodium sulfate: one part was 2g of sodium thiosulfate and 0.2g of sodium sulfate (first part), and the other two parts were 1g of sodium thiosulfate and 0.1g of sodium sulfate (second, third part).
2. Leaching test: weighing 1000mL of water, pouring the water into a leaching tank, adding the 1-butyl-3-methylimidazolium chloride weighed in the step 1, stirring for 5min, adding 250g of a test ore sample, stirring for 30min, adding the weighed ammonia water, stirring for 30min, adding a first part of a mixture of sodium thiosulfate and sodium sulfate, starting stirring and leaching, adding a second part of the mixture after leaching for 3h, stirring and leaching for 3h, adding a third part of the mixture, and stirring and leaching for 3 h.
Leaching test results: after leaching, filtering the ore pulp, taking leaching residues and leaching liquid to assay the grade of gold and silver respectively, and finally calculating the leaching rates of gold and silver to be 92.17% and 76.21% respectively.
Example 10, the sample ore sample was a mill flotation gold concentrate with a high copper content, the metal minerals in the ore being mainly pyrites, chalcopyrites, sphalerites and galena, and the gangue minerals being mainly quartz, feldspar and calcite. The gold minerals are mainly produced in pyrite, chalcopyrite and quartz in the forms of fissure gold and crystal gap gold, and the gold and silver grades are respectively 32.78g/t and 814.21 g/t.
The gold concentrate leaching process comprises the following steps:
1. preparing a combined leaching agent raw material: 2g of ammonia water and 1.5g of 1-butyl-3-methylimidazole chloride salt are respectively weighed and placed in different beakers for later use, and three parts of a mixture of sodium thiosulfate and sodium sulfate are respectively weighed: one part was 3g sodium thiosulfate and 0.3g sodium sulfate (first part), and the other two parts were 1.5g sodium thiosulfate and 0.15g sodium sulfate (second, third part).
2. Leaching test: weighing 1000mL of water, pouring the water into a leaching tank, adding the 1-butyl-3-methylimidazolium chloride weighed in the step 1, stirring for 5min, adding 200g of a test ore sample, stirring for 30min, adding the weighed ammonia water, stirring for 30min, adding a first part of a mixture of sodium thiosulfate and sodium sulfate, starting stirring and leaching, adding a second part of the mixture after leaching for 4h, stirring and leaching for 4h, adding a third part of the mixture, and stirring and leaching for 4 h.
Leaching test results: after leaching, filtering the ore pulp, taking leaching residues and leaching liquid to assay the grade of gold and silver respectively, and finally calculating the leaching rates of the gold and the silver to be 96.05 percent and 80.33 percent respectively.
Example 11, the test ore sample is a gold ore flotation tailing, the main minerals comprise quartz, mica, feldspar, calcite, limonite, stibnite and the like, gold mostly exists in the form of natural gold, the gold-carrying minerals mainly comprise arsenopyrite, limonite and stibnite, part of the gold-carrying minerals are closely symbiotic with gangue minerals such as quartz, calcite and the like, and the grade of the gold is 1.78g/t (the silver grade is low and the gold has no recovery value).
The gold flotation tailing leaching process comprises the following steps:
1. preparing a combined leaching agent raw material: respectively weighing 1g of ammonia water and 1g of 1-butyl-3-methylimidazolium chloride, placing the ammonia water and the 1g of 1-butyl-3-methylimidazolium chloride in different beakers for later use, and then respectively weighing three parts of a mixture of sodium thiosulfate and sodium sulfate: one part was 1.5g sodium thiosulfate and 0.5g sodium sulfate (first part), and the other two parts were 0.75g sodium thiosulfate and 0.25g sodium sulfate (second, third part).
2. Grinding an ore sample: grinding the tailing sample to the fineness of 85-0.038 mm.
3. Leaching test: weighing 1000mL of water, pouring the water into a leaching tank, adding the weighed 1-butyl-3-methylimidazole chloride salt, stirring for 5min, adding 300g of the ground test ore sample in the step 2, stirring for 30min, adding the weighed ammonia water, stirring for 30min, adding the first part of a mixture of sodium thiosulfate and sodium sulfate, starting stirring and leaching, adding the second part of the mixture after leaching for 2h, stirring and leaching for 2h, finally adding the third part of the mixture, and stirring and leaching for 2 h.
Leaching test results: and after leaching, filtering the ore pulp, taking leaching residues and leaching liquid to assay the grade of the gold respectively, and finally calculating the leaching rates of the gold to be 67.51 percent respectively.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept thereof within the scope of the present invention.
Claims (8)
1. The leaching combination medicament for the gold and silver minerals is characterized by being prepared from the following raw materials in parts by weight:
2-6 parts of sodium thiosulfate; 0.5-2 parts of ammonia water;
1-3 parts of 1-butyl-3-methylimidazolium chloride; 0.5-1.0 of sodium sulfate;
the preparation method comprises the following steps:
adding 1-butyl-3-methylimidazole chloride salt into water, stirring for 4-6min, adding the leached ore sample, stirring for 20-40min, then adding ammonia water, stirring for 20-40min, finally adding sodium thiosulfate and sodium sulfate, and stirring until leaching is finished.
2. The leaching combined reagent for gold and silver minerals as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
sodium thiosulfate 2; 0.5 of ammonia water;
1-butyl-3-methylimidazolium chloride salt; sodium sulfate 0.5.
3. The leaching combined reagent for gold and silver minerals as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
sodium thiosulfate 6; 2, ammonia water;
1-butyl-3-methylimidazolium chloride salt 3; sodium sulfate 1.0.
4. The leaching combined reagent for gold and silver minerals as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
sodium thiosulfate 4; 1.5 parts of ammonia water;
1-butyl-3-methylimidazolium chloride salt 3; sodium sulfate 0.6.
5. The leaching combined reagent for gold and silver minerals as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
sodium thiosulfate 6; 2, ammonia water;
1.5 parts of 1-butyl-3-methylimidazolium chloride; sodium sulfate 0.6.
6. The leaching combined reagent for gold and silver minerals as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
sodium thiosulfate 3; 1, ammonia water;
1-butyl-3-methylimidazolium chloride salt; sodium sulfate 1.
7. The leaching combined reagent for gold and silver minerals as claimed in claim 1, wherein: the 1-butyl-3-methylimidazole chloride salt and the ammonia water are added at one time according to the dosage, the sodium thiosulfate and the sodium sulfate are added in the leaching process for 3 times, 2/1 with the required dosage is added at the first time, and 1/4 with the required dosage is added at the last two times.
8. The leaching combined reagent for gold and silver minerals as claimed in claim 1, wherein: the stirring time for adding the 1-butyl-3-methylimidazole chlorine salt is 5 min; adding the leached ore sample, and stirring for 30 min; then, ammonia was added thereto and the stirring time was 30 min.
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| CN202010348657.2A CN111647743B (en) | 2020-04-28 | 2020-04-28 | Gold and silver mineral leaching combined medicament and preparation method thereof |
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| CN202010348657.2A CN111647743B (en) | 2020-04-28 | 2020-04-28 | Gold and silver mineral leaching combined medicament and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100132509A1 (en) * | 2000-05-19 | 2010-06-03 | Placer Dome Technical Services Ltd. | Method for thiosulfate leaching of precious metal-containing materials |
| US20140212346A1 (en) * | 2011-08-15 | 2014-07-31 | Her Majesty The Queen in Right of Canada as Repres ented by the Minister of Natural Resources Canada | Process of leaching precious metals |
| CN108842065A (en) * | 2018-05-31 | 2018-11-20 | 西北矿冶研究院 | Combined leaching agent for high-sulfur silver minerals and preparation method thereof |
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2020
- 2020-04-28 CN CN202010348657.2A patent/CN111647743B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100132509A1 (en) * | 2000-05-19 | 2010-06-03 | Placer Dome Technical Services Ltd. | Method for thiosulfate leaching of precious metal-containing materials |
| US20140212346A1 (en) * | 2011-08-15 | 2014-07-31 | Her Majesty The Queen in Right of Canada as Repres ented by the Minister of Natural Resources Canada | Process of leaching precious metals |
| CN108842065A (en) * | 2018-05-31 | 2018-11-20 | 西北矿冶研究院 | Combined leaching agent for high-sulfur silver minerals and preparation method thereof |
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