CN103290232A - Method for extracting gold from auriferous ores through potassium ferricyanide - Google Patents
Method for extracting gold from auriferous ores through potassium ferricyanide Download PDFInfo
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- CN103290232A CN103290232A CN201310262151XA CN201310262151A CN103290232A CN 103290232 A CN103290232 A CN 103290232A CN 201310262151X A CN201310262151X A CN 201310262151XA CN 201310262151 A CN201310262151 A CN 201310262151A CN 103290232 A CN103290232 A CN 103290232A
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Abstract
The invention relates to a method for extracting gold through potassium ferricyanide. The method is characterized in that the gold is extracted from the auriferous ores under an alkaline environment at normal temperature and pressure with nontoxic ferricyanide serving as a gold leaching agent and calcium peroxide serving as a leaching adding agent; and the method is a completely novel cyanide-free gold leaching method. According to the method, some auriferous ores which are difficultly treated are preprocessed and then leached for 2 to 20 hours at a normal-temperature alkaline environment and under the conditions that the concentration of potassium ferricyanide is 2 to 15%, the dosage of CaO2 is 1 to 10g/L and the liquid-solid ratio is 2: 1 to 10: 1; and the leaching rate of the gold can reach more than 94%. The method is simple and reliable in process and high in gold leaching rate and nearly not pollutes the environment; the reaction is carried out at the alkaline environment, so that equipment is nearly not corroded, and the requirement and cost are low, and the method has an important industrial application prospect.
Description
Technical field
The present invention relates to a kind of precious metal that from ore, extracts---the method for gold, particularly adopt the Tripotassium iron hexacyanide to put forward the method for gold, belong to the extraction field of gold.
Background technology
At present, about 85% gold all extracts with cyanide process in the world, it is simple that traditional cyanide process has technology, easy to operate, adaptability is good, advantage such as low and technology maturation of production cost, it is slow that but traditional cyanide process is soaked golden speed, poor selectivity, and prussiate has severe toxicity, and serious safety and problem of environmental pollution are arranged.Along with the requirement of now more and more stricter environmental pollution control laws and regulations, press for that research and development are novel effectively, nontoxic pollution-free, the more friendly golden medicament that soaks of environment replaced prussiate, and the leaching yield by new processing condition raising indissoluble gold ore deposit.
In recent years, used and study more non-cyaniding lixiviation process and mainly contain thiosulfate technique, polysulfide method, halogen process, thiocyanate-method and thiocarbamide method etc.Forefathers research is pointed out: the thermostability of thiosulphate is relatively poor, and the consumption of reagent is quite big when soaking gold, and is wayward to the temperature effect sensitivity, is difficult to practical application; Polysulfide is poor heat stability not only, and decomposes toxic gases such as meeting generation hydrogen sulfide, ammonia, and environmental pollution is serious; Though it is less relatively that halogen process pollutes, it is expensive, is difficult to bear; The thiocyanate-method is carried out in acidic medium, because the corrosive nature of acid, to the equipment requirements height; The thiocarbamide method is the cost height not only, and thiocarbamide has been listed in suspicious carcinogens in recent years, can not adopt.Than aforesaid method, Tripotassium iron hexacyanide toxicity is little, and low price is more stable in alkaline environment, low for equipment requirements.There are some researches show that abroad the Tripotassium iron hexacyanide during as oxygenant, not only can not produce toxic gas in cyanidation gold-extracted, and can increase the leaching yield of gold, can also reclaim the Tripotassium iron hexacyanide to waste liquid through certain processing.Also have the scholar to carry at alkaline thiourea and also use the Tripotassium iron hexacyanide as oxygenant in the gold, obtained good effect.But the Tripotassium iron hexacyanide directly extracts golden research as leaching agent and yet there are no report so far.
Summary of the invention
The purpose of this invention is to provide and a kind ofly carry out at alkaline medium condition, soak the non-potassium cyanide of golden medicament, but cost is low, it is fast and environmental pollution is little soaks golden method to soak golden speed, namely adopts the Tripotassium iron hexacyanide to soak gold.The concrete processing step of present method:
(1) drying: the gold ore sandstone is carried out drying;
(2) grind: the refined ore of step (1) oven dry is ground to certain particle size;
(3) roasting pre-treatment: get set by step (2) levigate ore in sand form, behind the roasting certain hour, it is even to take out calcining cooling back mill at a certain temperature;
(4) leaching: getting the calcining after a certain amount of (3) set by step roasting, under the normal temperature alkaline environment, is the Tripotassium iron hexacyanide of 2-15% with concentration, the CaO of 1-10g/L
2, be under the condition of 2:1 to 10:1 behind the leaching 2-20h by liquid-solid ratio, ore pulp is filtered obtain containing gold complex solution;
(5) Jin reduction: step (4) gained solution is displaced gold with metallic reducing.
Said roasting pre-treatment is at difficult-treating gold mine in the above-mentioned technology, and so-called difficult-treating gold mine refers to the Gold Ore that adopts traditional method to be difficult to extract, generally speaking, refers to grinding and soaking more than 20 hours, and leaching yield still is lower than 80% Gold Ore.If easily handle gold mine, can be directly used in and soak gold, do not need it is carried out pre-treatment.
The said Tripotassium iron hexacyanide is leaching agent in the above-mentioned technology.The Tripotassium iron hexacyanide is mineral crystal, and its chemical expression is K
3Fe (CN)
6Because the synthetic firm iron cyanogen root of the cyanogen root knot of iron ion and severe toxicity in the Tripotassium iron hexacyanide complex compound. be can not decompose in normal-temperature water solution, therefore it is considered to nontoxic, but itself and acid-respons can generate hypertoxic gas, must carry out under alkaline condition so soak gold reaction.
Said calcium peroxide is leaching agent in the above-mentioned technology, and said alkaline environment is to add a certain amount of sodium hydroxide.
The advantage that adopts present method to carry gold is simple and reliable process, and it is fast to soak golden speed, than the fast 2-4 of cyanide process commonly used doubly, has saved and has soaked the golden cycle; Leaching agent Tripotassium iron hexacyanide low price soaks gold in alkaline environment, little to equipment requirements, and then has reduced cost; The Tripotassium iron hexacyanide is nontoxic under the normal temperature alkaline condition, thereby environmental pollution is much smaller than cyanide process.
Embodiment
Following examples further specify the present invention, but do not limit the present invention.
Embodiment:The Tripotassium iron hexacyanide extracts the processing method of gold:
Sichuan flotation golden ore concentrate hard to treat (wherein contain golden 58.5g/t, sulfur-bearing 36.85% contains arsenic 7.45%, carbon containing 1.04%) is ground to 0.074mm; Roasting under certain temperature and time; In a certain amount of calcining, add 60ml and contain K
3Fe (CN)
6Be 5%, CaO
2Be the alkaline leaching liquid of 3g/L, leaching certain hour after-filtration under the normal temperature obtains gold leaching rate and is 94.5% your liquid, and your liquid reclaims gold with metallic reducing.
Claims (4)
1. one kind is extracted the method for gold in the gold containing ore with the Tripotassium iron hexacyanide, and its feature has following processing step:
(1) drying: the gold ore sandstone is carried out drying;
(2) grind: the refined ore of step (1) oven dry is ground to certain particle size;
(3) roasting pre-treatment: get set by step (2) levigate ore in sand form, behind the roasting certain hour, it is even to take out calcining cooling back mill at a certain temperature;
(4) leaching: getting the calcining after a certain amount of (3) set by step roasting, under the normal temperature alkaline environment, is the Tripotassium iron hexacyanide of 2-15% with concentration, the CaO of 1-10g/L
2, be under the condition of 2:1 to 10:1 behind the leaching 2-20h by liquid-solid ratio, ore pulp is filtered obtain containing gold complex solution;
(5) Jin reduction: step (4) gained solution is displaced gold with metallic reducing.
2. according to claim 1 with the golden method of Tripotassium iron hexacyanide extraction, it is characterized in that said roasting pre-treatment in the step (3), be at difficult-treating gold mine, so-called difficult-treating gold mine, refer to the Gold Ore that the employing traditional method is difficult to extract, generally speaking, refer to grinding and soaking more than 20 hours, leaching yield still is lower than 80% Gold Ore; If easily handle gold mine, can be directly used in and soak gold, do not need it is carried out pre-treatment.
3. the method with Tripotassium iron hexacyanide extraction gold according to claim 1 is characterized in that the said Tripotassium iron hexacyanide is leaching agent in the step (4); The Tripotassium iron hexacyanide is mineral crystal, and its chemical expression is K
3Fe (CN)
6Because the synthetic firm iron cyanogen root of the cyanogen root knot of iron ion and severe toxicity in the Tripotassium iron hexacyanide complex compound. be can not decompose in normal-temperature water solution, therefore it is considered to nontoxic, but itself and acid-respons can generate hypertoxic gas, must carry out under alkaline condition so soak gold reaction.
4. the method with Tripotassium iron hexacyanide extraction gold according to claim 1 is characterized in that said calcium peroxide is leaching agent in the step (4), and said alkaline environment is to add a certain amount of sodium hydroxide.
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| CN201310262151XA CN103290232A (en) | 2013-06-27 | 2013-06-27 | Method for extracting gold from auriferous ores through potassium ferricyanide |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480324A (en) * | 2014-12-16 | 2015-04-01 | 成都理工大学 | Method of extracting gold from gold-bearing ores by potassium ferricyanide |
| CN106319237A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Efficient gold dissolving agent and preparation method thereof |
| CN106319238A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Gold ore gold dissolving agent and preparation method thereof |
| CN106893861A (en) * | 2017-04-13 | 2017-06-27 | 中国有色桂林矿产地质研究院有限公司 | A kind of golden agent of sulfur-bearing environmental protection leaching and preparation method thereof |
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| CN102690942A (en) * | 2012-06-18 | 2012-09-26 | 中南大学 | Method for reduction roasting and fortified acid dissolving of sulfur-containing gold concentrate calcine |
| CN102703713A (en) * | 2012-07-04 | 2012-10-03 | 广西地博矿业集团股份有限公司 | Method for improving gold recycle rate in two-stage burning-cyaniding gold leaching process |
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| CN1186867A (en) * | 1996-12-29 | 1998-07-08 | 长沙铁道学院 | Method of extracting gold by mixed oxidant in cyaniding leaching |
| CN1932052A (en) * | 2006-10-11 | 2007-03-21 | 云南省地质科学研究所 | Integral gold refining kiln oxidizing roasting process for refractory gold ore |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480324A (en) * | 2014-12-16 | 2015-04-01 | 成都理工大学 | Method of extracting gold from gold-bearing ores by potassium ferricyanide |
| CN106319237A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Efficient gold dissolving agent and preparation method thereof |
| CN106319238A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Gold ore gold dissolving agent and preparation method thereof |
| CN106893861A (en) * | 2017-04-13 | 2017-06-27 | 中国有色桂林矿产地质研究院有限公司 | A kind of golden agent of sulfur-bearing environmental protection leaching and preparation method thereof |
| CN106893861B (en) * | 2017-04-13 | 2018-08-14 | 中国有色桂林矿产地质研究院有限公司 | Golden agent of a kind of sulfur-bearing environmental protection leaching and preparation method thereof |
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Application publication date: 20130911 |