CN104232922B - A kind of Sodium cyanate (NaOCN) gold-leaching technology - Google Patents
A kind of Sodium cyanate (NaOCN) gold-leaching technology Download PDFInfo
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- CN104232922B CN104232922B CN201410560532.0A CN201410560532A CN104232922B CN 104232922 B CN104232922 B CN 104232922B CN 201410560532 A CN201410560532 A CN 201410560532A CN 104232922 B CN104232922 B CN 104232922B
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Abstract
A kind of Sodium cyanate (NaOCN) leaching gold method, to Gold Concentrate under Normal Pressure ore grinding, mog accounts for 85-95% for-400 orders; Does is then sizing mixing and making liquid-solid mass ratio 2:1-5:1, adds leaching agent Cao? 4-8kg/t, Na2CO31-3kg/t, regulation system pH value is between 9-12, and leaching gold agent Sodium cyanate (NaOCN) 0.5-8 ��, extraction time is 4-18 hour. The present invention soaks that gold method technique is simple, and gold leaching rate is high, and particularly environmental pollution is little, and dosing is little and low price. React that equipment corrosion impact is little, it is desirable to low, cost is low, has prospects for commercial application.
Description
Technical field
The invention belongs to environment-friendly type technology for gold extraction field, be specifically related to a kind of Sodium cyanate (NaOCN) leaching gold method.
Background technology
Gold is one of important noble metal, is used as finance deposit and valuable jewelry for a long time.
And there is excellent performance, gold have also been obtained extensive use in modern high technology industry, such as technical fields such as electronics, communication, aerospace, chemical industry, medical treatment.
At present, the commonly used cyanidation technique of gold industry extracts gold from from mineral, because this technology is relatively easy, effective and economical.
Owing to cyanide toxicity is significantly high, adult's lethal dose is only 50 milligrams, therefore, uses cyanide to cause people's worry to environment aspect.
At present, some countries and regions have prohibitted the use of cyanide; It is relatively slow that cyanidation technique carries gold process kinetics, generally needs 24 hours or the longer time; Easily soak the exhaustion of gold mine along with earth's surface, it has been found that primary ore mostly be sulphide ore.
To these containing gold mine, cyaniding effect is bad, causes cyanide consumption too high or golden extraction rate is very low, or both have concurrently.
In order to improve the response rate of gold, gold industry development and application oxidation pre-treatment technology, such as chemical oxidation, oxygen pressure (or autoclave) oxidation, biological oxidation and roasting (due to environmental problem, the application of roasting technology is restricted) etc.
But the ore pulp produced after oxidized pretreatment or calcining have peracid to be formed more, if cyanide gold-leaching, it is necessary to consume suitable alkali (Calx etc.) and be neutralized, cause gold smelting cost to improve, and major part is highly basic, and equipment has very big corrosivity.
Cyanide Leaching is adopted containing sulfur gold ore or gold oxide ores now more, Cyanide Leaching contains severe toxicity due to its cyanide, environment has certain pollution, and now national that cyanide wastewater and waste residue environmental requirement is very strict, it is trend of the times that a kind of effective leaching medicament of searching carrys out substitute.
Non-cyanidation gold method has By Thiourea-uv Method, chlorination processes method, bromination method, iodide process, magnetic charcoal method, rhodanate method, polysulfide method, thiosulfate technique etc.
But these methods all exist certain deficiency, and some technological processes are perfect not, the then reagent consumption having is big, and cost is high, and the response rate is low; Have because of medicament unstable, it is easy to oxidized decomposition; What have then can not form plant-scale application to the bad adaptability etc. of Ore.
Sodium cyanate (NaOCN) molecular formula is NaCNO, is a kind of white or pale white crystals powder.
(when 16 �� of C, 10.68 grams of Sodium cyanate (NaOCN)s of solubilized in 100ml water) soluble in water.
It is slightly soluble in the organic solvent such as liquid chlorine and benzene, ethanol, ether.
Its fusing point is 550 DEG C, and boiling point is to decompose more than 600 DEG C.
Relative density is 1.94.
The structure of cyanic acid is cyanogen root one oxygen atom of upper introducing, and therefore Sodium cyanate (NaOCN) is only small to the toxicity of people and animals.
The reagent such as Cyanogran. substituting high poison currently with the Sodium cyanate (NaOCN) of low toxicity rarely has report.
Summary of the invention
It is an object of the invention to provide a kind of leaching gold method of novel environment friendly low toxicity that Sodium cyanate (NaOCN) utilizing low toxicity substitutes the Cyanogran. of high poison, this leaching gold method simple and reliable process, gold leaching rate is high, and particularly environmental pollution is little, and dosing is little and low price. React that equipment corrosion impact is little, it is desirable to low, cost is low, has important prospects for commercial application.
To achieve these goals, the technical scheme is that
A kind of Sodium cyanate (NaOCN) gold-leaching technology, comprises the steps:
1) initially with ball mill, Gold Concentrate under Normal Pressure is carried out ore grinding process, make fineness-400 order in gold concentrate material account for 85-95%;
2) then sizing mixing, making the solid mass ratio of pulp slurry is 2:1-5:1, is sequentially added into leaching agent Cao4-8kg/t, leaching agent Na2CO31-3kg/t, regulation system pH value, between 9-12, is subsequently adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 0.5-8 �� of Gold Concentrate under Normal Pressure weight, leaches 4-18 hour at 20-30 DEG C;
3) Gold Concentrate under Normal Pressure is filtered after leaching, and filtrate obtains gold mud through zinc dust precipitation, obtains gold containing material after gold mud refine.
In above-mentioned gold-leaching technology, the solid mass ratio of pulp slurry is for preferably ranging from 3:1-4:1.
In above-mentioned gold-leaching technology, leaching agent Cao, Na2CO3It is calculate in reference count for the weight of Gold Concentrate under Normal Pressure with leaching gold agent Sodium cyanate (NaOCN) consumption. Cao and Na2CO3Playing the effect of pH value regulator in system, make system pH control between 9-12, wherein above-mentioned Leaching Systems can also be played certain stability action by sodium carbonate.
In gold-leaching technology of the present invention, Gold Concentrate under Normal Pressure is filtered after leaching, and filtrate obtains gold mud through zinc dust precipitation, obtains gold containing material after gold mud refine, it is also possible to according to circumstances apply carbon adsorption or ion-exchange-resin process.
In the present invention, Sodium cyanate (NaOCN) can substitute with potassium cyanate, it is considered to Sodium cyanate (NaOCN) price relatively potassium cyanate is low, it is preferable that Sodium cyanate (NaOCN).
Leaching gold can be carried out for gold ores containing sulfur and gold oxide ores, to different types of gold mine, except pulverizing, it is not necessary to carry out pretreatment for different mineral, be directly added into calcium oxide, sodium bicarbonate and leaching gold agent.
The present invention is the method adopting novel environment-friendly leaching gold agent Sodium cyanate (NaOCN) Leaching of Gold, select the Sodium cyanate (NaOCN) 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 brand-new non-cyanide gold-leaching.
Compared with prior art present invention have the advantage that
1, Sodium cyanate (NaOCN) instead of the Cyanogran. of severe toxicity as leaching gold agent, belongs to novel environment-friendly leaching gold agent, and technique is green safety more.
2, Sodium cyanate (NaOCN) amount ratio Cyanogran. is few, and Sodium cyanate (NaOCN) is than Cyanogran. low price two to three times of Sodium cyanate (NaOCN) price (Cyanogran. price be), so greatly reducing production cost.
3, this process is simple to operate, reacts that equipment corrosion impact is little, and cost is low, has good prospects for commercial application.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with detailed description of the invention, the present invention is described in more detail.It should be understood that these descriptions are illustrative of, and it is not intended to limit the scope of the present invention. Additionally, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring idea of the invention.
Embodiment 1
First the ball mill containing sulfur gold ore being processed, after process, in gained Gold Concentrate under Normal Pressure material, fineness accounts for 85% for-400 orders; Then sizing mixing, making the solid mass ratio of pulp slurry is 2:1, is then sequentially added into the leaching agent Na of leaching agent Cao, 2kg/t of 4kg/t in system2CO3, regulation system pH value is 9.0, is eventually adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 0.5 �� of Gold Concentrate under Normal Pressure weight, and after leaching 10 hours at 20-30 DEG C, gold leaching rate reaches 97.2%.
Embodiment 2
First the ball mill containing sulfur gold ore being processed, after process, in gained Gold Concentrate under Normal Pressure material, fineness accounts for 90% for-400 orders; Then sizing mixing, making the solid mass ratio of pulp slurry is 3:1, is then sequentially added into the leaching agent Na of leaching agent Cao, 2kg/t of 6kg/t in system2CO3, regulation system pH value is 9.6, is eventually adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 3 �� of Gold Concentrate under Normal Pressure weight, and after leaching 4 hours at 20-30 DEG C, gold leaching rate reaches 98.7%.
Embodiment 3
First gold oxide ores ball mill being processed, after process, in gained Gold Concentrate under Normal Pressure material, fineness accounts for 90% for-400 orders; Then sizing mixing, making the solid mass ratio of pulp slurry is 4:1, is then sequentially added into the leaching agent Na of leaching agent Cao, 3kg/t of 7kg/t in system2CO3, regulation system pH value is 11.2, is eventually adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 5 �� of Gold Concentrate under Normal Pressure weight, and after leaching 10 hours at 20-30 DEG C, gold leaching rate reaches 98.6%.
Embodiment 4
First gold oxide ores ball mill being processed, after process, in gained Gold Concentrate under Normal Pressure material, fineness accounts for 95% for-400 orders; Then sizing mixing, making the solid mass ratio of pulp slurry is 5:1, is then sequentially added into the leaching agent Na of leaching agent Cao, 1kg/t of 8kg/t in system2CO3, regulation system pH value is 12.0, is eventually adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 8 �� of Gold Concentrate under Normal Pressure weight, and after leaching 18 hours at 20-30 DEG C, gold leaching rate reaches 99.2%.
Above-described embodiment show the present invention room temperature, normal pressure process conditions under, gold leaching rate is up to more than 97%, and medicament Sodium cyanate (NaOCN) consumption is few, instead of the Cyanogran. of high poison with the Sodium cyanate (NaOCN) of low toxicity.
Although embodiments of the present invention are described in detail, it should be appreciated that, when without departing from the spirit and scope of the present invention, it is possible to embodiments of the present invention are made various change, replacement and change.
Claims (2)
1. a Sodium cyanate (NaOCN) leaching gold method, it is characterised in that leaching gold method comprises the following steps:
1) initially with ball mill, Gold Concentrate under Normal Pressure being carried out ore grinding process, make fineness in gold concentrate material account for 85-95% for-400 orders, described Gold Concentrate under Normal Pressure is containing sulfur gold ore or gold oxide ores;
2) then sizing mixing, making the solid mass ratio of pulp slurry is 2:1-5:1, is sequentially added into leaching agent CaO4-8kg/t, leaching agent Na2CO31-3kg/t, regulation system pH value, between 9-12, is eventually adding leaching gold agent Sodium cyanate (NaOCN), and consumption is the 0.5-8 �� of Gold Concentrate under Normal Pressure weight, leaches 4-18 hour at 20-30 DEG C.
2. leaching gold method according to claim 1, it is characterised in that described liquid-solid mass ratio is 3:1-4:1.
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| CN104911372B (en) * | 2015-07-05 | 2017-05-17 | 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 |
| 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 |
| 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 |
| CN109731668B (en) * | 2019-02-15 | 2020-12-11 | 赤峰柴胡栏子黄金矿业有限公司 | Method for reducing total cyanogen concentration of tailings in gold ore dressing process |
| CN113755695B (en) * | 2021-08-11 | 2023-06-16 | 昆明理工大学 | Method for enriching and recovering gold in thiosulfate solution |
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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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| 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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