CN102051480A - Method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins - Google Patents
Method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins Download PDFInfo
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- CN102051480A CN102051480A CN2011100227401A CN201110022740A CN102051480A CN 102051480 A CN102051480 A CN 102051480A CN 2011100227401 A CN2011100227401 A CN 2011100227401A CN 201110022740 A CN201110022740 A CN 201110022740A CN 102051480 A CN102051480 A CN 102051480A
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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
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Abstract
The invention relates to a method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins and adopts the technical scheme that the method comprises the following steps of: (1) weighting persimmon tannins, adding sulfuric acid into the persimmon tannins and acidifying the mixture at 90-100 DEG C for 6-12 hours; (2) washing the acidified persimmon tannins with water, and drying at the room temperature to obtain a persimmon tannins absorbing agent; (3) weighting solution containing gold ions, regulating the acidity of the solution, and then adding the persimmon tannins absorbing agent for stirring, standing and absorbing, wherein [H<+>] is 0.1-4mol/L. Gold can be extracted at one step by using the absorbing agent prepared by the invention without energy consumption, energy saving and environment protection are realized, in addition, the absorbing agent is simple in preparation, rich in sources and low in price and has an actual application value.
Description
Technical field
The invention belongs to the technical field that rare precious metals effectively extract and green sorbent material prepares, be specifically related to a kind ofly utilize simple chemically treated persimmon tannin selectivity and adsorb the trivalent gold effectively from contain gold ion and foreign metal ion solution, and it directly can be reduced to the method for simple substance gold.
Background technology
Gold is the human metal of early finding and utilizing.Owing to its rareness, special and precious, be regarded as having first of the five metals title of " king of metal " since ancient times, enjoy the incomparable great fame of other metal, its illustrious status is almost eternal.Gold utensil has high erosion-resisting stability; Good electrical conductivity and thermal conductivity; The nucleus of gold has the free area of catching neutron more greatly; To ultrared reflection potential near 100%; In the alloy of gold, have various catalyst character; Gold also has favorable manufacturability, very easily is processed into ultra-thin goldleaf, micron spun gold and bronze; Gold is easy to be plated on the surface of other metal and pottery and glass, and gold is easily by melting welding and smithwelding under certain pressure; Gold can be made into superconductor and organic gold etc.Because these beneficial properties of gold are widely applied in the modern high technology industry it and go, and for example all contain a large amount of gold in the mainboard of mobile phone, computer and various instruments, but the resource of gold is more and more poorer.So the gold in efficient recovery mine and the electron wastes is the problem that extensively receives publicity.
The method that reclaims gold at present mainly contains electrolytic refining process and solvent extration.There are following 3 problems in the electrolytic refining process gold extraction technology: the extraction of gold in the 1. only suitable au-alloy, if the content height of foreign metal, electrolytic process just can't normally carry out.2. relatively strict, the gold of electrorefining operational condition all has distribution in negative electrode gold, electrolytic solution, the anode sludge and anode scrap, causes the direct yield and the rate of recovery of gold all low, the direct yield of gold only 70%; 3. it is long that the gold time is carried in electrolysis, and it is big that anode scrap returns treatment capacity, and excessive inventory for fund.The essence of solvent extration is that gold independent extracting and separating from chlorinated solution is come out, and through solvent wash, acidifying precipitate reduction gold, the shortcoming that solvent extration exists is: the easy emulsification of extraction agent, and required raw material types is many, and production unit is many, and production cost is higher.
As mentioned above, gold is applied to various fields, is one of indispensable rare metal of industry and life.But the method for at present traditional extraction gold, the rate of loss height of gold, and do not meet the aim of energy-saving and emission-reduction.Therefore from various auriferous wastes, immersion liquid gold being carried out that efficient recovery utilizes again will be to enjoy popular confidence.
Simultaneously, the output of the puckery persimmon of China is 5,000,000 tons/year, and major part all is used to make the puckery liquid of persimmon for utilizations such as the skins of tanning.Residue after squeezing the juice or directly discarded perhaps is used as fertilizer, causes the waste of resource.
Summary of the invention
Problem at prior art exists the object of the present invention is to provide a kind of persimmon tannin that utilizes to adsorb the method for preparing the simple substance gold synchronously, and method of the present invention is simple to operate, the direct yield height of gold, the processing cycle is short, and sulfuric acid can be recycled, and is pollution-free and processing cost is low.
The present invention is achieved through the following technical solutions: a kind of persimmon tannin that utilizes adsorbs the method for preparing the simple substance gold synchronously, it is characterized in that comprising following processing step:
1) get persimmon tannin, add sulfuric acid, under temperature 90-100 ℃, acidification 6-12 hour;
The persimmon tannin water flushing of 2) acidification being crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) get the solution that contains gold ion, the acidity of regulator solution, [H in the ie in solution
+] be 0.1-4 mol/L, add the persimmon tannin sorbent material then, stir, static, be adsorbed to equilibrium state.
Above-mentioned persimmon tannin sorbent material consumption is 1kg: 0.9-1.0mol with GOLD FROM PLATING SOLUTION ionic ratio.
Creativeness of the present invention is: utilize the persimmon tannin after the acidification to make sorbent material, selective adsorption reduction gold from the solution that contains gold ion.And do not limit for the preparation method of the solution that contains gold ion, for those skilled in the art, can adopt disclosed dissolving method in the prior art, various auriferous wastes, auriferous mine and electron wastes are dissolved, be made into the solution that contains gold ion, this is conspicuous for a person skilled in the art.
The invention has the beneficial effects as follows:
1. abundant raw material: tannin (Tannins) is the bitter taste of plant or sends out composition puckery, exists the tannin in the persimmon to be called as persimmon tannin in a large number.The period that is suitable for gathering in the crops sophisticated puckery persimmon contain solubility persimmon tannin in the water of 1-2%, contain solubility persimmon tannin in the water of 5-6% in the immature puckery persimmon.And the output of Chinese puckery persimmon is 5,000,000 tons/year, and major part all is dropped at present, cause the waste of resource, and the present invention has made full use of this resource.
2. method is simple: the present invention carries out direct acidification with persimmon tannin and is modulated into sorbent material, the extraction of gold in the gold-containing solution of suitable different acidity, to the adsorptive capacity big (0.8-1.0kg/kg sorbent material) of Au (III), and can reach the auric effect of direct reduction.
3. the cycle is short: the processing cycle only need 5-10 hour just can be with trivalent gold absorbing and reducing.
4. direct yield height: direct yield can reach more than 95%.
5. economize in raw materials: the sulfuric acid that is used for acidification among the present invention can use repeatedly.
6. pollution-free: this polyphenolic substance of persimmon tannin and metal ion form fluor-complex, up to the present attempt to utilize this character to modulate metal absorbent from polyphenolic substance in a large number.The sorbent material that can adsorb in this case,, reclaim, remove predetermined substance from water must be water insoluble.Modulate insoluble sorbent material and need be cured processing, be cured processing and need use chemical substances such as Epicholorohydrin, Paraformaldehyde 96, these chemical substances much are objectionable impuritiess.And directly use sulfuric acid that persimmon tannin is carried out acidification in the inventive method, promptly can be made into sorbent material, be directly used in the absorbing and reducing gold, because no any chemical objectionable impurities in the absorbing and reducing process, and sulfuric acid can use repeatedly, therefore can not pollute environment.
7. cost is low: processing cost reduces significantly, and processing cost is the 10-20% of traditional treatment method.
8. applied widely: the present invention is fit to any solution that contains gold ion, to be dissolved in the high foreign metal of wherein content such as Cu, Fe, Zn, Sn, Pd, Pt etc. do not adsorb, demonstrating the persimmon tannin sorbent material has efficient selective to gold utensil.
In sum, the sorbent material of the present invention's preparation only needs single stage method just can carry gold, energy free consumption, and energy-conserving and environment-protective, and also the sorbent material preparation is simple, and the source is abundant and cheap, has actual applicability.
Description of drawings
Fig. 1 is absorbing and reducing product of the present invention---the XRD figure of simple substance gold.
Embodiment
Following examples are in order to elaborate the present invention, and do not limit the present invention, especially for the preparation method who contains gold ion solution, several preparation methods that contain gold ion solution have been provided in following examples, but the present invention does not limit the preparation method who contains gold ion solution, those skilled in the art can be dissolved containing golden waste according to disclosed dissolving method in the prior art, and preparation contains gold ion solution.
The acidity that embodiment 1 is different and other coexisting ions are to the influence of gold absorption
1) contains the preparation of gold ion solution: a certain amount of hydrochloro-auric acid is dissolved in the water, and add cupric chloride, iron(ic) chloride, zinc chloride, nickelous chloride, Palladous chloride and the Platinic chloride strong solution of identical molar mass, what be mixed with that Cu, Fe, Zn, Ni, Pd, Pt metal ion with gold coexistence exist contains gold ion solution, and main component has Au 30ppm, Cu 30ppm, Fe 30ppm, Zn 30ppm, Ni 30ppm, Pd 30ppm, Pt 30ppm in this solution;
2) persimmon tannin preparation of adsorbent: get 20g persimmon tannin (precious company limited provides by Jincheng, Jiangxi persimmon), add sulfuric acid, under temperature 90-100 ℃, acidification 10 hours; With the persimmon tannin flushing with clean water that acidification is crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) absorbing and reducing gold: that gets above-mentioned preparation respectively contains gold ion solution 100ml, the acidity of pressing table 1 regulator solution, the hydrogen ion concentration [H in the ie in solution
+], add 0.1 g persimmon tannin sorbent material then, stirred 1 hour, obtain product after static 3 hours.
The absorbing and reducing product is done XRD figure, be illustrated in figure 1 as the simple substance gold.Direct yield and purity such as table 1.
Table 1 acidity is adsorbed the performance impact of Au (III) to persimmon tannin
| Acidity mol/L | 0.1 | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| Direct yield % | 100 | 100 | 100 | 100 | 92 | 88 |
| Purity % | 99.1 | 99.2 | 99.1 | 99.3 | 99.5 | 99.5 |
By table 1 as seen, under different acidity, the persimmon tannin sorbent material is good to the absorption property of Au (III), and is not subjected to the influence of system acidity.Substantially be not adsorbed with Cu, Fe, Zn, Ni, the metals such as Pd, Pt of gold coexistence, demonstrating the persimmon tannin sorbent material has efficient selective to gold utensil.
Embodiment 2 utilizes the gold in the persimmon tannin sorbent material extraction electronic waste
1) contains the preparation of gold ion solution: the computer circuits panel element is dissolved with chlorination process, obtain containing gold ion solution, main component has Au100ppm, Cu3360 ppm, Zn1040 ppm, Fe760 ppm, Pd 6.3ppm, Pt 4.1 ppm, and acidity is 1.0 mol/L;
2) persimmon tannin preparation of adsorbent: get 20g persimmon tannin (precious company limited provides by Jincheng, Jiangxi persimmon), add sulfuric acid, under temperature 90-100 ℃, acidification 6 hours; With the persimmon tannin flushing with clean water that acidification is crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) absorbing and reducing gold: that gets above-mentioned preparation contains gold ion solution 500ml, adds 0.4 g persimmon tannin sorbent material then, stirs 1 hour, obtains the absorbing and reducing product after static 3 hours.
The absorbing and reducing product is the simple substance gold by the method validation of embodiment 1, and the direct yield of gold is 96%, and Au directly is adsorbed the agent reduction, and the product that obtains gold purity is greater than 99%.
Embodiment 3 utilizes the gold in the persimmon tannin sorbent material extraction electronic waste
1) contain gold ion solution: get the chlorination electronic waste solution of alloying element, main component has Au150ppm, Cu5667 ppm, Zn670ppm, Fe1260 ppm, Pd 2.3ppm, Pt 3.4ppm, and acidity is 2.5mol/L;
2) persimmon tannin preparation of adsorbent: get 20g persimmon tannin (precious company limited provides by Jincheng, Jiangxi persimmon), add sulfuric acid, under temperature 90-100 ℃, acidification 12 hours; With the persimmon tannin flushing with clean water that acidification is crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) absorbing and reducing gold: get the above-mentioned gold ion solution 500ml that contains, add 0.5g persimmon tannin sorbent material then, obtain the absorbing and reducing product after static 3 hours.
The absorbing and reducing product is the simple substance gold by the method validation of embodiment 1, and the direct yield of gold is 95%, and Au directly is adsorbed the agent reduction, and the product that obtains gold purity is greater than 99%.
Embodiment 4 utilizes the persimmon tannin sorbent material to extract the actual golden waste liquid that contains
1) contain gold ion solution: this solution is the golden waste liquid that contains in the gold extractive process of mine, and main component has main component that Au20ppm, Cu70ppm, Zn23ppm, Fe 100 ppm are arranged, and acidity is 2.5mol/L;
2) persimmon tannin preparation of adsorbent: get 20g persimmon tannin (precious company limited provides by Jincheng, Jiangxi persimmon), add sulfuric acid, under temperature 90-100 ℃, acidification 12 hours; With the persimmon tannin flushing with clean water that acidification is crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) absorbing and reducing gold: get the above-mentioned gold ion solution 500ml that contains, add 0.1g persimmon tannin sorbent material then, obtain the absorbing and reducing product after static 3 hours.
The absorbing and reducing product is the simple substance gold by the method validation of embodiment 1, and the direct yield of gold is 95%, and Au directly is adsorbed the agent reduction, and the product that obtains gold purity is greater than 99%.
Claims (2)
1. one kind is utilized persimmon tannin to adsorb the method for preparing the simple substance gold synchronously, it is characterized in that method is as follows:
1) get persimmon tannin, add sulfuric acid, under temperature 90-100 ℃, acidification 6-12 hour;
The persimmon tannin water flushing of 2) acidification being crossed, dry under the room temperature, get the persimmon tannin sorbent material;
3) get the solution that contains gold ion, the acidity of regulator solution, [H in the ie in solution
+] be 0.1-4 mol/L, add the persimmon tannin sorbent material then, stir, static, absorption.
2. adsorb the method for preparing the simple substance gold synchronously according to the described persimmon tannin that utilizes of claim 1, it is characterized in that: persimmon tannin sorbent material consumption is 1kg: 0.9-1.0mol with GOLD FROM PLATING SOLUTION ionic ratio.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534211A (en) * | 2012-01-20 | 2012-07-04 | 北京科技大学 | Method for selectively adsorbing and extracting gold by using mangosteen slag |
| CN102560120A (en) * | 2012-01-20 | 2012-07-11 | 北京科技大学 | Method for extracting gold from electronic waste leaching solution by using garlic wastes |
| CN104148022A (en) * | 2014-08-12 | 2014-11-19 | 辽宁大学 | Amine-modified persimmon tannin adsorbent, and preparation method and application thereof |
| CN110314652A (en) * | 2018-03-29 | 2019-10-11 | 河北农业大学 | A kind of absorption and recovery method using persimmon slag to noble metal gold |
| CN112473627A (en) * | 2020-10-19 | 2021-03-12 | 西北农林科技大学 | Tannin composite adsorbent and preparation method thereof |
| CN113684371A (en) * | 2021-07-29 | 2021-11-23 | 中国科学院金属研究所 | Method for efficiently recovering gold based on poly-tannic acid coated carbon nanotube composite membrane |
| CN114752760A (en) * | 2022-03-28 | 2022-07-15 | 北京科技大学 | Method for extracting gold and platinum group metal by utilizing selective biological adsorption |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534211A (en) * | 2012-01-20 | 2012-07-04 | 北京科技大学 | Method for selectively adsorbing and extracting gold by using mangosteen slag |
| CN102560120A (en) * | 2012-01-20 | 2012-07-11 | 北京科技大学 | Method for extracting gold from electronic waste leaching solution by using garlic wastes |
| CN102560120B (en) * | 2012-01-20 | 2013-05-22 | 北京科技大学 | Method for extracting gold from electronic waste leaching solution by using garlic wastes |
| CN104148022A (en) * | 2014-08-12 | 2014-11-19 | 辽宁大学 | Amine-modified persimmon tannin adsorbent, and preparation method and application thereof |
| CN104148022B (en) * | 2014-08-12 | 2017-02-15 | 辽宁大学 | Amine-modified persimmon tannin adsorbent, and preparation method and application thereof |
| CN110314652A (en) * | 2018-03-29 | 2019-10-11 | 河北农业大学 | A kind of absorption and recovery method using persimmon slag to noble metal gold |
| CN112473627A (en) * | 2020-10-19 | 2021-03-12 | 西北农林科技大学 | Tannin composite adsorbent and preparation method thereof |
| CN113684371A (en) * | 2021-07-29 | 2021-11-23 | 中国科学院金属研究所 | Method for efficiently recovering gold based on poly-tannic acid coated carbon nanotube composite membrane |
| CN114752760A (en) * | 2022-03-28 | 2022-07-15 | 北京科技大学 | Method for extracting gold and platinum group metal by utilizing selective biological adsorption |
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