CN104232922A - Sodium cyanate gold leaching technology - Google Patents
Sodium cyanate gold leaching technology Download PDFInfo
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- CN104232922A CN104232922A CN201410560532.0A CN201410560532A CN104232922A CN 104232922 A CN104232922 A CN 104232922A CN 201410560532 A CN201410560532 A CN 201410560532A CN 104232922 A CN104232922 A CN 104232922A
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- gold
- leaching
- zassol
- agent
- sodium cyanate
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Abstract
The invention discloses a sodium cyanate gold leaching technology, comprising the steps of: grinding gold concentrate to enable 400-mesh particles to be 85%-95% of grinded gold concentrate, mixing to be thick liquid with a liquid-solid mass ratio of 2:1 to 5:1, adding 8kg/t of Cao4 and 1-3kg/t of Na2CO3 as leaching agents, adjusting a system pH value to be 9-12, adding 0.05-0.8% of sodium cyanate as a gold leaching agent, and leaching for 4-18 hours. The gold leaching technology is simple in process, high in gold leaching efficiency, small in pollution to environment, small in reagent use amount and cheap in price. According to the sodium cyanate gold leaching technology, corrosion influence of reaction on equipment is small; the sodium cyanate gold leaching technology is low in requirement and cost, and has industrial application prospects.
Description
Technical field
The invention belongs to environment-friendly type technology for gold extraction field, be specifically related to a kind of Zassol and soak golden method.
Background technology
Gold is one of important precious metal, is used as finance deposit and valuable jewellery for a long time.
And there is excellent performance, gold have also been obtained widespread use in modern high technology industry, as technical fields such as electronics, communication, aerospace, chemical industry, medical treatment.
At present, gold industry generally adopts cyanidation technique to extract gold from from mineral, because this technology is relatively simple, effective and economical.
Because prussiate toxicity is very high, adult's lethal quantity is only 50 milligrams, therefore, uses prussiate to cause people to the worry of environment aspect.
At present, some countries and regions prohibit the use prussiate; It is relatively slow that cyanidation technique carries golden process kinetics, generally needs 24 hours or the longer time; Along with the exhaustion of gold mine is easily soaked on earth's surface, the primary ore of discovery mostly is sulphide ores.
To these containing gold mine, cyaniding effect is bad, causes that cyanide consumption is too high or golden leaching rate is very low, or both have concurrently.
In order to improve the rate of recovery of gold, gold industry development and application oxidation pre-treatment technology, as chemical oxidation, oxygen pressure (or autoclave) oxidation, bio-oxidation and roasting (due to environmental problem, the application of roasting technology is restricted) etc.
But the ore pulp produced after oxidation pre-treatment or calcining have peracid to be formed, if cyanide gold-leaching more, need to consume suitable alkali (lime etc.) and neutralize, cause gold smelting cost to improve, and major part is highly basic, has very large corrodibility to equipment.
Adopt Cyanide Leaching now containing sulfur gold ore or gold oxide ores more, Cyanide Leaching contains severe toxicity due to its prussiate, have certain pollution to environment, now country to cyanide wastewater and waste residue environmental requirement very strict, find and a kind ofly effectively leach medicament to carry out substitute be trend of the times.
Non-cyanidation gold method has By Thiourea-uv Method, chlorination processes method, bromination method, iodination, magnetic charcoal method, thiocyanate-method, polysulfide method, thiosulfate technique etc.
But these methods all exist certain deficiency, some technical process are perfect not, and the then reagent consumption had is large, and cost is high, and the rate of recovery is low; Have because of medicament unstable, easy oxidized decomposition; What have then can not form plant-scale application to the bad adaptability etc. of ore.
Zassol molecular formula is NaCNO, is a kind of white or pale white crystals powder.
(when 16 ° of C, solubilized 10.68 grams of Zassols in 100ml water) soluble in water.
Be slightly soluble in the organic solvent such as liquid chlorine and benzene, ethanol, ether.
Its fusing point is 550 DEG C, and it is to decompose that boiling point is greater than 600 DEG C.
Relative density is 1.94.
The structure of cyanic acid is cyanogen root upper introducing Sauerstoffatom, and therefore Zassol is very little to the toxicity of people and animals.
Utilize the Zassol of low toxicity to substitute the reagent such as the sodium cyanide of high poison at present and rarely have report.
Summary of the invention
The object of this invention is to provide a kind of leaching gold method utilizing the Zassol of low toxicity to substitute the novel environment friendly low toxicity of the sodium cyanide of high poison, this leaching gold method simple and reliable process, gold leaching rate is high, and particularly environmental pollution is little, the little and low price of dosing.React little on equipment corrosion impact, require low, cost is low, has important prospects for commercial application.
To achieve these goals, technical scheme of the present invention is:
A kind of Zassol gold-leaching technology, comprises the steps:
1) first adopt ball mill to carry out ore grinding process to gold ore, make fineness-400 order in gold concentrate material account for 85-95%;
2) then size mixing, make the solid mass ratio of pulp slurry be 2:1-5:1, add leaching agent Cao 4-8kg/t, leaching agent Na successively
2cO
31-3kg/t, regulation system pH value is between 9-12, and then add the golden agent Zassol of leaching, consumption is the 0.5-8 ‰ of gold ore weight, at 20-30 DEG C, leach 4-18 hour;
3) gold ore is filtered after leaching, and filtrate obtains gold mud through zinc dust precipitation, obtains gold containing material after gold mud refining.
In above-mentioned gold-leaching technology, the solid mass ratio of pulp slurry is preferable range is 3:1-4:1.
In above-mentioned gold-leaching technology, leaching agent Cao, Na
2cO
3be benchmark with the weight of gold ore with the golden agent Zassol consumption of leaching.Cao and Na
2cO
3in system, play the effect of pH value regulator, make system pH control between 9-12, wherein sodium carbonate can also play certain stability action to above-mentioned Leaching Systems.
In gold-leaching technology of the present invention, gold ore is filtered after leaching, and filtrate obtains gold mud through zinc dust precipitation, obtains gold containing material after gold mud refining, also can according to circumstances apply carbon adsorption or ion-exchange-resin process.
In the present invention, Zassol can substitute with potassium cyanate, and comparatively potassium cyanate is low to consider Zassol price, preferred Zassol.
Leaching gold can be carried out for gold ores containing sulfur and gold oxide ores, to different types of gold mine, except pulverizing, not need to carry out pre-treatment for different mineral, directly add calcium oxide, sodium bicarbonate and soak golden agent.
The present invention is the method adopting novel environment-friendly to soak golden agent Zassol Leaching of Gold, select the Zassol of low toxicity as gold lixivant, calcium oxide and sodium carbonate, as leaching agent, extract the gold in gold mine under normal temperature and pressure alkaline environment, are a kind of methods of non-cyanide gold-leaching completely newly.
Compared with prior art tool of the present invention has the following advantages:
1, Zassol instead of the sodium cyanide of severe toxicity as the golden agent of leaching, and belong to novel environment-friendly and soak golden agent, technique is green safety more.
2, Zassol amount ratio sodium cyanide is few, and Zassol is than sodium cyanide low price (sodium cyanide price is two to three times of Zassol price), so greatly reduce production cost.
3, this processing method is simple to operate, and react little on equipment corrosion impact, cost is low, has good prospects for commercial application.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Embodiment 1
First process containing sulfur gold ore ball mill, after process, in gained gold ore material, fineness accounts for 85% for-400 orders; Then size mixing, make the solid mass ratio of pulp slurry be 2:1, in system, then add the leaching agent Na of leaching agent Cao, 2kg/t of 4kg/t successively
2cO
3, regulation system pH value is 9.0, and finally add the golden agent Zassol of leaching, consumption is 0.5 ‰ of gold ore weight, and leach after 10 hours at 20-30 DEG C, gold leaching rate reaches 97.2%.
Embodiment 2
First process containing sulfur gold ore ball mill, after process, in gained gold ore material, fineness accounts for 90% for-400 orders; Then size mixing, make the solid mass ratio of pulp slurry be 3:1, in system, then add the leaching agent Na of leaching agent Cao, 2kg/t of 6kg/t successively
2cO
3, regulation system pH value is 9.6, and finally add the golden agent Zassol of leaching, consumption is 3 ‰ of gold ore weight, and leach after 4 hours at 20-30 DEG C, gold leaching rate reaches 98.7%.
Embodiment 3
First process gold oxide ores ball mill, after process, in gained gold ore material, fineness accounts for 90% for-400 orders; Then size mixing, make the solid mass ratio of pulp slurry be 4:1, in system, then add the leaching agent Na of leaching agent Cao, 3kg/t of 7kg/t successively
2cO
3, regulation system pH value is 11.2, and finally add the golden agent Zassol of leaching, consumption is 5 ‰ of gold ore weight, and leach after 10 hours at 20-30 DEG C, gold leaching rate reaches 98.6%.
Embodiment 4
First process gold oxide ores ball mill, after process, in gained gold ore material, fineness accounts for 95% for-400 orders; Then size mixing, make the solid mass ratio of pulp slurry be 5:1, in system, then add the leaching agent Na of leaching agent Cao, 1kg/t of 8kg/t successively
2cO
3, regulation system pH value is 12.0, and finally add the golden agent Zassol of leaching, consumption is 8 ‰ of gold ore weight, and leach after 18 hours at 20-30 DEG C, gold leaching rate reaches 99.2%.
Above-described embodiment shows that the present invention is under the processing condition of room temperature, normal pressure, and gold leaching rate is up to more than 97%, and medicament Zassol consumption is few, instead of the sodium cyanide of high poison with the Zassol of low toxicity.
Although describe embodiments of the present invention in detail, it should be understood that when without departing from the spirit and scope of the present invention, various change, replacement and change can be made to embodiments of the present invention.
Claims (3)
1. Zassol soaks a golden method, it is characterized in that, soaks golden method and comprises the following steps:
First adopt ball mill to carry out ore grinding process to gold ore, make fineness in gold concentrate material account for 85-95% for-400 orders;
Then size mixing, make the solid mass ratio of pulp slurry be 2:1-5:1, add leaching agent Cao 4-8kg/t, leaching agent Na successively
2cO
31-3kg/t, regulation system pH value is between 9-12, and finally add the golden agent Zassol of leaching, consumption is the 0.5-8 ‰ of gold ore weight, at 20-30 DEG C, leach 4-18 hour.
2. the golden method of leaching according to claim 1, is characterized in that, described liquid-solid mass ratio is 3:1-4:1.
3. the golden method of leaching according to claim 1, is characterized in that, described gold ore is for containing sulfur gold ore or gold oxide ores.
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|---|---|---|---|
| CN201410560532.0A CN104232922B (en) | 2014-10-21 | 2014-10-21 | A kind of Sodium cyanate (NaOCN) gold-leaching technology |
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|---|---|---|---|
| CN201410560532.0A CN104232922B (en) | 2014-10-21 | 2014-10-21 | A kind of Sodium cyanate (NaOCN) gold-leaching technology |
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| CN104232922A true CN104232922A (en) | 2014-12-24 |
| CN104232922B CN104232922B (en) | 2016-06-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911372A (en) * | 2015-07-05 | 2015-09-16 | 贵州大学 | Pre-treatment method for micro-disseminated type refractory primary gold ore |
| CN105950884A (en) * | 2016-04-27 | 2016-09-21 | 天津华勘矿业选冶技术开发有限公司 | Environmental-protection gold leaching agent and preparation method thereof |
| CN107435102A (en) * | 2017-06-29 | 2017-12-05 | 江西理工大学 | A kind of non-cyanogen leaching agent and its method for Gold ore leaching |
| CN108411109A (en) * | 2018-04-09 | 2018-08-17 | 郑州大学 | A kind of golden tellurium new technique for separating and extracting of the Gold Concentrate under Normal Pressure containing tellurium |
| CN109731668A (en) * | 2019-02-15 | 2019-05-10 | 赤峰柴胡栏子黄金矿业有限公司 | The method of tailings total cyanogen concentration is reduced in a kind of gold mine ore dressing process |
| CN113755695A (en) * | 2021-08-11 | 2021-12-07 | 昆明理工大学 | Enrichment recovery of gold (Au (S) in thiosulfate solution2O3)23-) of (b) |
| CN116219188A (en) * | 2023-01-30 | 2023-06-06 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for reducing mercury leaching rate in mercury-containing gold ore leaching process |
| CN117248120A (en) * | 2023-09-28 | 2023-12-19 | 河北苍骥环保科技有限公司 | Environment-friendly gold extraction agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103409644A (en) * | 2013-09-05 | 2013-11-27 | 魏清成 | Beneficiation reagent, synthesis method and method for comprehensively utilizing generated waste gases |
| CN103695644A (en) * | 2013-12-13 | 2014-04-02 | 李敬坤 | Gold and silver leaching agent prepared from cyanate and method for recovering gold and silver by using leaching agent |
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- 2014-10-21 CN CN201410560532.0A patent/CN104232922B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103409644A (en) * | 2013-09-05 | 2013-11-27 | 魏清成 | Beneficiation reagent, synthesis method and method for comprehensively utilizing generated waste gases |
| CN103695644A (en) * | 2013-12-13 | 2014-04-02 | 李敬坤 | Gold and silver leaching agent prepared from cyanate and method for recovering gold and silver by using leaching agent |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911372A (en) * | 2015-07-05 | 2015-09-16 | 贵州大学 | Pre-treatment method for micro-disseminated type refractory primary gold ore |
| CN105950884A (en) * | 2016-04-27 | 2016-09-21 | 天津华勘矿业选冶技术开发有限公司 | Environmental-protection gold leaching agent and preparation method thereof |
| CN107435102A (en) * | 2017-06-29 | 2017-12-05 | 江西理工大学 | A kind of non-cyanogen leaching agent and its method for Gold ore leaching |
| CN107435102B (en) * | 2017-06-29 | 2019-09-03 | 江西理工大学 | A kind of non-cyanogen leaching agent and its method for Gold ore leaching |
| CN108411109A (en) * | 2018-04-09 | 2018-08-17 | 郑州大学 | A kind of golden tellurium new technique for separating and extracting of the Gold Concentrate under Normal Pressure containing tellurium |
| CN108411109B (en) * | 2018-04-09 | 2019-10-25 | 郑州大学 | A kind of golden tellurium separation-extraction technology of the Gold Concentrate under Normal Pressure containing tellurium |
| CN109731668A (en) * | 2019-02-15 | 2019-05-10 | 赤峰柴胡栏子黄金矿业有限公司 | The method of tailings total cyanogen concentration is reduced in a kind of gold mine ore dressing process |
| CN113755695A (en) * | 2021-08-11 | 2021-12-07 | 昆明理工大学 | Enrichment recovery of gold (Au (S) in thiosulfate solution2O3)23-) of (b) |
| CN116219188A (en) * | 2023-01-30 | 2023-06-06 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for reducing mercury leaching rate in mercury-containing gold ore leaching process |
| CN117248120A (en) * | 2023-09-28 | 2023-12-19 | 河北苍骥环保科技有限公司 | Environment-friendly gold extraction agent and preparation method thereof |
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|---|---|
| CN104232922B (en) | 2016-06-08 |
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