CN102614837A - Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent - Google Patents
Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent Download PDFInfo
- Publication number
- CN102614837A CN102614837A CN2011100308396A CN201110030839A CN102614837A CN 102614837 A CN102614837 A CN 102614837A CN 2011100308396 A CN2011100308396 A CN 2011100308396A CN 201110030839 A CN201110030839 A CN 201110030839A CN 102614837 A CN102614837 A CN 102614837A
- Authority
- CN
- China
- Prior art keywords
- gold
- persimmon
- persimmon tannin
- metal absorbent
- adsorbent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of natural product extraction and utilization, and especially relates to a method for adsorbing and recovering a precious metal gold by a persimmon tannin-containing metal adsorbent. The method can be used for selectively adsorbing and recovering a gold element in a secondary resource and has the characteristics of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method comprises the following steps of 1, weighing a certain amount of a persimmon tannin-containing adsorbent, and adding the weighed persimmon tannin-containing adsorbent into a triangular flask, 2, adding an alloy ion-containing mixed solution having a pH value of 2 to 4 into the triangular flask, wherein the volume of the used alloy ion-containing mixed solution is less than or equal to half of the volume of the triangular flask, 3, sealing an opening of the triangular flask by a sealing film, putting the sealed triangular flask into a shaking table, and carrying out adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 25 to 50 DEG C for 12 to 24h, and 4, carrying out filtration so that gold ions in the alloy ion-containing mixed solution are adsorbed by the persimmon tannin-containing adsorbent. The method also can be used for adsorbing and recovering a precious metal gold by a chromatographic column.
Description
Technical field
The invention belongs to natural products and utilize technical field, be specifically related to a kind of method of utilizing the absorption of persimmon tannin metal absorbent and reclaiming Precious Metals-Gold, can effectively adsorb and reclaim the gold in the secondary resource.
Background technology
Be present in the persimmon fruit and make its polyphenols that is astringent taste be called persimmon tannin (persimmon tannin or kaki tannin), belong to condensed type tannin (condensed tannin).By a 2-5 consists of four polyphenol compounds (catechins: catechin -3 - gallic acid: epigallocatechin: epigallocatechin -3 - gallic acid = 1:1:2:2) arrangement of The basic unit of a series, the molecular weight of 1.38 × 10
4 (Matsuo et al 1978).A plurality of ortho positions phenolic hydroxyl group that persimmon tannin contains can be used as polyhydroxy part and metal ion and carries out ligand exchange reaction, forms netted huge legendary turtle compound, and under different pH value settle, utilizes this characteristic can carry out the recovery and reuse of metallic element.
China is the country of origin of persimmon (Diospyros kaki Thunb.), also be that the persimmon production history is the longest in the world, area is maximum (660,000 hectares, about 10,200,000 mu; Account for the world 89%) and output the highest (2,700,000 tons; Account for the world 70%) country.The tradition producing region overwhelming majority is puckery persimmon, and is distributed in before the room behind the house and the edge of a field more, as the inconvenience of gathering of commodity fresh fruit; And persimmon becomes to spend easily, and young fruit period (period that tannin content is the highest) physiological fallen fruit is more; In addition, about 50% persimmon of China really is generally used for making dried persimmon, and consequent discarded persimmon skin accounts for fresh fruit weight 10%.Contain higher tannin content in these come off young fruit and discarded persimmon skins, and cost of material is extremely low.
Along with the development of society, countries in the world are increasing to the demand of noble metal, and the noble metal mineral products are reducing day by day.Simultaneously, also cumulative year after year of the quantity of electron wastes.The content of noble metal is generally far above precious metal ore in the secondary resource; According to statistics; Gold content reaches 0.45kg is just arranged in 1 ton of circuit board of arbitrarily collecting, so absorption recovery Precious Metals-Gold has the double action of resources conservation and environmental protection from secondary resource, has main application prospect.Present technique utilizes a kind of gold dollar that contains the metal absorbent absorption of persimmon tannin and reclaim in the secondary resource plain.
At present, domestic and international its absorption of this property research that has had the scholar to utilize tannin, for example acacia mearnsii tannin and larch tannin to Precious Metals-Gold.But utilize persimmon tannin to adsorb Precious Metals-Gold, the present domestic play-by-play that do not have as yet for material.Abroad except that Japan, do not see to have yet and utilize persimmon tannin to adsorb the report of Precious Metals-Gold for material.Nakajima etc. (1993) utilize persimmon tannin to come the ADSORPTION OF GOLD ion.The author carries out the crosslinked persimmon tannin gel that obtains solidifying with persimmon tannin and formaldehyde, and this gel can adsorb Au (III) efficiently from tetra chlorauric acid solution.Parajuli etc. (2007) utilize discarded persimmon skin and aldehydes that association reaction takes place under concentrated sulfuric acid effect; Generate insoluble gel; Be used for adsorbing the gold ion that reclaims hydrochloric acid solution; Reached good effect, and proved that this adsorbent has selectivity to Au (III), in adsorption process, Au (III) has been reduced for Au (0).Xiong etc. (2009) utilize dimethylamine modification persimmon skin gel, have obtained a kind of novel gel (DMA-PW).This gel not only adsorbs Au (III) in hydrochloric acid medium, to Pd (II), the Pt equally also selective absorption of noble metal such as (IV), but to the but almost not absorption of Cu (II), Zn (II), Fe (III), Ni underlying metal ions such as (II).But the method that contains the persimmon tannin adsorbent of above-mentioned preparation, or need to extract persimmon tannin, increase cost, or reaction condition violent (need add the concentrated sulfuric acid), and preparation time is long.
Summary of the invention
The objective of the invention is to utilize the persimmon tannin extract plain with the gold dollar that reclaims in the secondary resource as the native metal adsorbents adsorb.The present invention directly adopts the metal absorbent of persimmon powder preparation, has natural environmental-protective, and cost of material is low, and reaction condition is gentle, and the reaction time is short, outstanding features such as extraction efficiency height.
The present invention realizes through following technical scheme:
A kind of method of utilizing persimmon tannin absorption and reclaiming Precious Metals-Gold may further comprise the steps:
(1) preparation persimmon tannin metal absorbent:
The raw material persimmon fruit or the persimmon skin that 1) will contain persimmon tannin clean up, and pulverize or squeeze the juice, and behind 40-200Mpa vacuum freeze drying 10-40h, obtain containing persimmon tannin persimmon powder, and be subsequent use;
2) with the sodium hydroxide solution that persimmon tannin persimmon powder adds 0.125-0.25mol/L that contains of step 1) gained, abundant stirring and evenly mixing, and then to add by v/v be 37% formalin, stirs, and obtains containing the solid absorbent semifinished product of persimmon tannin;
3) with step 2) the adsorbent semifinished product of gained carries out water-bath, and bath temperature is 60-90 ℃, and the water-bath time is 8-24h, and it is fully reacted; Reacted adsorbent semifinished product is spent deionised water once, use concentration once then, at last with deionized water cyclic washing to neutrality and remove wherein solable matter as the washing of the rare nitric acid of 0.05-0.5mol/L; Adsorbent semifinished product after the washing is put into baking oven, dry 24h under 60-70 ℃; Be crushed to particle and cross 100 mesh sieves, promptly obtain containing the metal absorbent of persimmon tannin;
The pH value that (2) will contain the gold ion mixed solution transfers to 2-4;
(3) described metal absorbent is put into nonmetallic vessel and contained gold ion mixed solution one and react, or soak described metal absorbent 12h with buffer solution earlier before the upper prop, described metal absorbent is filled into carried out post in the chromatographic column; By mg/mL, the quality of metal absorbent is 1 with the volume ratio that contains the gold ion mixed solution: 3-5, cumulative volume are that the nonmetallic vessel volume is below 1/2;
(4) with the absorption of step (3) mixture of golden metal absorbent all burnt with the impurity of flame incineration in metal absorbent; Obtain proof gold; Or will adsorb golden metal adsorption agent composition 12-24h with the eluant, eluent thiocarbamide wash-out of 1mol/L; Obtain concentrate eluant, the liquid of further removing in the eluent obtains proof gold;
Wherein:
Reaction condition in the nonmetallic vessel is: adopt vibration absorption, reaction temperature is 20-50 ℃; Shaking speed is 100-200rpm, and the adsorption reaction time is 12-24h;
Chromatographic column condition: chromatographic column internal diameter 1cm; Long 30cm; The flow velocity of flowing phase is 6-10mL/h, crosses post 12h with buffer solution earlier, crosses post 12h with the mixed solution that contains gold ion then;
Buffer formulation: deionized water, pH 2-4.
Outstanding advantage compared with prior art of the present invention is:
(1) ability of metal absorbent ADSORPTION OF GOLD ion of the present invention is very high, and every gram metal absorbent is adsorbable to contain the gold of 1 gram in the mixed solution of gold ion.
(2) the present invention has good selective absorption effect to Precious Metals-Gold, can be from the mixed solution that contains gold ion under condition of the present invention the selective absorption gold ion, and to almost not absorption such as other ion such as iron, copper, zinc.
(3) raw material sources of preparation metal absorbent of the present invention are extensive, and the production cost of adsorbent is low.
(4) metal absorbent of the present invention has reducing power, need not re-use other reducing agent and just can cost have both been practiced thrift in high valence state gold ion reduction, and is free from environmental pollution again.
(5) metal absorbent of the present invention adopts natural material, can not pollute environment after discarding.
(6) the present invention is easy to operate, and is not high to equipment requirements, and suitability for industrialized production is convenient in the low and environmental protection of cost.
Description of drawings
Fig. 1 .pH value is to the influence of adsorbents adsorb gold.
Fig. 2. the time is to the influence of adsorbents adsorb gold.
Fig. 3. temperature is to the influence of adsorbents adsorb gold.
Fig. 4. the persimmon tannin absorbent concentration is to the influence of absorption.
Fig. 5. GOLD FROM PLATING SOLUTION ion initial concentration is to the influence of absorption.
Fig. 6. the XRD figure spectrum of persimmon tannin adsorbent.
Fig. 7. the XRD figure of gold spectrum in the adsorbent behind the persimmon tannin adsorbents adsorb gold ion.
Fig. 8. the persimmon tannin adsorbent is to the absorption of the simulation hybrid ionic solution that contains the Precious Metals-Gold ion.
Fig. 9. the persimmon tannin adsorbent is to the absorption of the real solution that contains the Precious Metals-Gold ion.
Figure 10. the infrared spectrogram of the metal absorbent of the present invention's preparation.
The specific embodiment
The preparation of embodiment 1 metal absorbent
The raw material persimmon fruit or the persimmon skin that (1) will contain persimmon tannin earlier clean up, and pulverize or squeeze the juice, and behind 40-200Mpa vacuum freeze drying 10-40h, obtain containing persimmon tannin persimmon powder, and be subsequent use;
(2) with the sodium hydroxide solution that persimmon tannin persimmon powder adds 0.125-0.25mol/L that contains of step 1) gained, abundant stirring and evenly mixing, and then to add by v/v be 37% formalin, stirs, and obtains containing the solid granular adsorbent semifinished product of persimmon tannin;
3) with step 2) the adsorbent semifinished product of gained carries out water-bath, and bath temperature is 81 ℃, and the water-bath time is 24h, and it is fully reacted; Reacted adsorbent semifinished product is spent deionised water once, more once, spend deionised water to neutrality at last repeatedly and remove solable matter wherein with the washing of 100mL 0.05mol/L dilute nitric acid solution; Adsorbent semifinished product after the washing is put into baking oven, dry 24h under 60-70 ℃; Be crushed to particle and cross 100 mesh sieves, promptly obtain the metal absorbent that rufous contains persimmon tannin, the infrared spectrum of the metal absorbent of the present invention's preparation is seen shown in Figure 10.
The pH value that (1) will contain the gold ion mixed solution transfers to 2-4;
(2) described metal absorbent is put into triangular flask, react, seal with sealing film with containing gold ion mixed solution one; By mg/mL, the quality of metal absorbent is 1 with the volume ratio that contains the gold ion mixed solution: 3-5, cumulative volume are that the triangular flask volume is below 1/2;
(3) with the absorption of step (2) mixture of golden metal absorbent all burnt with the impurity of flame incineration in metal absorbent; Obtain proof gold; Or will adsorb golden metal adsorption agent composition 12-24h with the eluant, eluent thiocarbamide wash-out of 1mol/L; Obtain concentrate eluant, the liquid of further removing in the eluent promptly obtains proof gold;
Wherein:
Reaction condition in the nonmetallic vessel is: adopt vibration absorption, reaction temperature is 20-50 ℃; Shaking speed is 100-200rpm;
The adsorption reaction time is 12-24h; Filter; Gold ion can be adsorbed by metal absorbent fully.
The pH value of hybrid ionic solution (seeing shown in the table 1) that (1) will contain the variable concentrations of gold ion transfers to 2;
(2) metal absorbent of embodiment 1 and the gold ion mixed solution of step (1) are pressed mg/mL, the volume ratio of metal absorbent quality and solution is 1: 3-5 joins in the triangular flask;
(3) triangular flask is sealed with sealing film, putting into temperature is set in advance is that 30-50 ℃, rotating speed are the shaking table of 100-200rpm, and vibration absorption 24h filters, and gold ion can be adsorbed agent and adsorb fully;
(4) further reclaim in the metal absorbent pure gold method with reference to the step (3) of embodiment 1.
Each ion initial concentration of four absorption systems of the present invention sees that table 1 is said.
Each ion initial concentration of four absorption systems of table 1
(1) discarded circuit board of mobile phone solution (the seeing table 2) 300mL that takes aqua regia dissolution puts into the beaker (surveying the pH=0.8 of this mixed solution) of 500mL, with NaOH its pH is transferred to 2-4;
(2) remove ionized water 500mL, its pH value is transferred to 2-4, be buffer solution with hydrochloric acid;
(3) buffer solution of getting 200mL step (2) soaks 11mg metal absorbent 12h;
(4) soaked metal absorbent is inserted in the chromatographic column of internal diameter 1cm, long 30cm;
(6) flow rate of mobile phase with chromatographic column is made as 6mL/h, and the sample interval is 1h, crosses post 12h with the buffer solution of step (2);
The discarded circuit board of mobile phone solution that (7) will contain gold ion is crossed post 12h, and the gold ion to this circuit board solution is promptly adsorbed by metal absorbent fully.
(8) further reclaim in the metal absorbent pure gold method with reference to the step (3) of embodiment 1.
The initial concentration of each ion in table 2 actual sample
The main reference document
1.Matsuo?Tomoaki，Ito?Saburo.The?chemical?structure?of?kaki-tannin?from?immature?fruit?of?the?persimmon?(Diospyros?kaki?L.).Agricultural?Biology?Chemistry，1978，42：1637-1643.
2.Nakajima?Akira?and?Sakaguchi?Takashi.Uptake?and?Recovery?of?Gold?by?Immobilized?Persimmon?Tannin.Journal?of?Chemical?Technology?and?Biotechnology，1993，57，321-326.
3.Parajuli?Durga，Kawakita?Hidetaka，Inoue?Katsutoshi，Ohto?Keisuke，Kajiyama?Kumiko.Persimmon?peel?gel?for?the?selective?recovery?of?gold.Hydrometallurgy，2007，87：133-139.
4.Xiong?Ying，Adhikari?Chaitanya?Raj，Kawakita?Hidetaka，Ohto?Keisuke，Inoue?Katsutoshi，Harada?Hiroyuki.Selective?recovery?of?precious?metals?by?persimmon?waste?chemically?modified?with?dimethylamine.Bioresource?Technology，2009，100：4083-4089.
Claims (1)
1. the method utilizing the absorption of persimmon tannin metal absorbent and reclaim Precious Metals-Gold is characterized in that, may further comprise the steps:
(1) preparation persimmon tannin metal absorbent:
The raw material persimmon that 1) will contain persimmon tannin really cleans up, and pulverizes or squeezes the juice, and behind 40-200Mpa vacuum freeze drying 10-40h, obtains containing persimmon tannin persimmon powder, and is subsequent use;
2) with the sodium hydroxide solution that persimmon tannin persimmon powder adds 0.125-0.25mol/L that contains of step 1) gained, abundant stirring and evenly mixing, and then to add by v/v be 37% formalin, stirs, and obtains containing the solid absorbent semifinished product of persimmon tannin;
3) with step 2) the adsorbent semifinished product of gained carries out water-bath, and bath temperature is 60-90 ℃, and the water-bath time is 8-24h, and it is fully reacted; Reacted adsorbent semifinished product is spent deionised water once, use concentration once then, at last with deionized water cyclic washing to neutrality and remove wherein solable matter as the washing of the rare nitric acid of 0.05-0.5mol/L; Adsorbent semifinished product after the washing is put into baking oven, dry 24h under 60-70 ℃; Be crushed to particle and can cross 100 mesh sieves, promptly obtain containing the metal absorbent of persimmon tannin;
The pH value that (2) will contain the gold ion mixed solution transfers to 2-4;
(3) described metal absorbent is put into nonmetallic vessel and contained gold ion mixed solution one and react, or soak described metal absorbent 1h with buffer solution earlier before the upper prop, described metal absorbent is filled into carried out post in the chromatographic column; By mg/mL, the quality of metal absorbent is 1 with the volume ratio that contains the gold ion mixed solution: 3-5, cumulative volume are that the nonmetallic vessel volume is below 1/2;
(4) with the absorption of step (3) mixture of golden metal absorbent all burnt with the impurity of flame incineration in metal absorbent; Obtain proof gold; Or will adsorb golden metal adsorption agent composition 12-24h with the eluant, eluent thiocarbamide wash-out of 1mol/L; Obtain concentrate eluant, the liquid of further removing in the eluent obtains proof gold;
Wherein:
Reaction condition in the nonmetallic vessel: adopt vibration absorption, reaction temperature is 20-50 ℃; Shaking speed is 100-200rpm, and the adsorption reaction time is 12-24h, filters;
Chromatographic column condition: chromatographic column internal diameter 1cm; Long 30cm; The flow velocity of flowing phase is 6-10mL/h, crosses post 12h with buffer solution earlier, crosses post 12h with the mixed solution that contains gold ion then;
Buffer formulation: deionized water, pH 2-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100308396A CN102614837B (en) | 2011-01-28 | 2011-01-28 | Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100308396A CN102614837B (en) | 2011-01-28 | 2011-01-28 | Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102614837A true CN102614837A (en) | 2012-08-01 |
| CN102614837B CN102614837B (en) | 2013-09-25 |
Family
ID=46555252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100308396A Expired - Fee Related CN102614837B (en) | 2011-01-28 | 2011-01-28 | Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102614837B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899489A (en) * | 2012-11-05 | 2013-01-30 | 桂林电子科技大学 | Method for recovering gold from electronic wastes by using solidified persimmon tannin |
| CN103736463A (en) * | 2014-01-07 | 2014-04-23 | 华中农业大学 | Modification method and application of metal adsorbent containing persimmon tannin |
| CN104445499A (en) * | 2014-11-18 | 2015-03-25 | 华中农业大学 | Method for adsorbing and recycling heavy metal cadmium by using metal adsorbent employing persimmon leaves as raw material |
| CN104789774A (en) * | 2014-01-21 | 2015-07-22 | 中国科学院过程工程研究所 | Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling |
| CN105289519A (en) * | 2015-10-19 | 2016-02-03 | 辽宁大学 | Persimmon tannin adsorbent and preparing method and application thereof |
| WO2019235967A1 (en) * | 2018-06-07 | 2019-12-12 | Открытое акционерное общество "Красноярский завод цветных металлов имени В.Н. Гулидова" | Method for refining gold-silver alloys to produce gold |
| CN113832355A (en) * | 2021-09-16 | 2021-12-24 | 清华大学深圳国际研究生院 | Method for recovering gold from solution containing gold ions |
| CN113881065A (en) * | 2021-11-05 | 2022-01-04 | 内江师范学院 | Novel tannin-based heavy metal flocculant, preparation method and application thereof |
| CN114672647A (en) * | 2022-03-28 | 2022-06-28 | 北京科技大学 | Method for selectively and sequentially extracting palladium and platinum by using grape skin temperature control |
| CN114672652A (en) * | 2022-03-28 | 2022-06-28 | 北京科技大学 | Method for sequentially and selectively extracting palladium and platinum by acid control of green walnut shells |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690937A (en) * | 1979-10-31 | 1981-07-23 | Uop Inc | Improvement of valuable metal recovery |
| CN101096395A (en) * | 2007-06-28 | 2008-01-02 | 武汉理工大学 | Method for synthesizing persimmon tannin-crylic acid series macromolecule bibulous resin |
| CN101613383A (en) * | 2009-08-03 | 2009-12-30 | 五峰赤诚生物科技有限公司 | A kind of method of from persimmon, producing persimmon tannin |
-
2011
- 2011-01-28 CN CN2011100308396A patent/CN102614837B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690937A (en) * | 1979-10-31 | 1981-07-23 | Uop Inc | Improvement of valuable metal recovery |
| CN101096395A (en) * | 2007-06-28 | 2008-01-02 | 武汉理工大学 | Method for synthesizing persimmon tannin-crylic acid series macromolecule bibulous resin |
| CN101613383A (en) * | 2009-08-03 | 2009-12-30 | 五峰赤诚生物科技有限公司 | A kind of method of from persimmon, producing persimmon tannin |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899489A (en) * | 2012-11-05 | 2013-01-30 | 桂林电子科技大学 | Method for recovering gold from electronic wastes by using solidified persimmon tannin |
| CN103736463B (en) * | 2014-01-07 | 2015-05-20 | 华中农业大学 | Modification method and application of metal adsorbent containing persimmon tannin |
| CN103736463A (en) * | 2014-01-07 | 2014-04-23 | 华中农业大学 | Modification method and application of metal adsorbent containing persimmon tannin |
| CN104789774B (en) * | 2014-01-21 | 2017-10-13 | 中国科学院过程工程研究所 | It is a kind of to utilize reduction and method golden in the adsorbing coupled selective recovery aqueous solution |
| CN104789774A (en) * | 2014-01-21 | 2015-07-22 | 中国科学院过程工程研究所 | Method used for selective recovery of gold in aqueous solutions via reduction and adsorption coupling |
| CN104445499A (en) * | 2014-11-18 | 2015-03-25 | 华中农业大学 | Method for adsorbing and recycling heavy metal cadmium by using metal adsorbent employing persimmon leaves as raw material |
| CN105289519A (en) * | 2015-10-19 | 2016-02-03 | 辽宁大学 | Persimmon tannin adsorbent and preparing method and application thereof |
| WO2019235967A1 (en) * | 2018-06-07 | 2019-12-12 | Открытое акционерное общество "Красноярский завод цветных металлов имени В.Н. Гулидова" | Method for refining gold-silver alloys to produce gold |
| CN113832355A (en) * | 2021-09-16 | 2021-12-24 | 清华大学深圳国际研究生院 | Method for recovering gold from solution containing gold ions |
| CN113881065A (en) * | 2021-11-05 | 2022-01-04 | 内江师范学院 | Novel tannin-based heavy metal flocculant, preparation method and application thereof |
| CN114672647A (en) * | 2022-03-28 | 2022-06-28 | 北京科技大学 | Method for selectively and sequentially extracting palladium and platinum by using grape skin temperature control |
| CN114672652A (en) * | 2022-03-28 | 2022-06-28 | 北京科技大学 | Method for sequentially and selectively extracting palladium and platinum by acid control of green walnut shells |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102614837B (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102614837B (en) | Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent | |
| CN102614834B (en) | Method for adsorbing and recovering heavy metals of lead and copper by persimmon tannin-containing metal adsorbent | |
| CN102614836B (en) | Method for adsorbing and recovering precious metal palladium by persimmon tannin-containing metal adsorbent | |
| CN101357325B (en) | Globular cellulose chelate sorbent containing amidoxime group and carboxy and preparation method thereof | |
| CN105214617B (en) | Surface imprinted chitosan microball of high efficiency selected heavy metal ion and preparation method thereof | |
| CN106010601A (en) | Biochar prepared from banana peel, preparation method and application thereof | |
| CN102614835A (en) | Persimmon tannin-containing metal adsorbent and preparation method thereof | |
| CN104785212A (en) | Biomass adsorbent, and preparation method and applications thereof | |
| CN105170108B (en) | A kind of rice husk cellulose adsorbent and its preparation method and application | |
| CN102895952B (en) | Porous carbon material capable of selectively absorbing gold ions, preparation method and application of porous carbon material | |
| CN101698711B (en) | Method for preparing chitosan resin for extracting noble metals from bittern | |
| CN103464119B (en) | Preparation method and application of modified cysteine palm bark adsorbent | |
| CN108046401A (en) | The method for preparing activated carbon nanometer iron composite material using autumn eggplant leaf | |
| CN102051480B (en) | Method for preparing elemental gold by utilizing synchronous absorption of persimmon tannins | |
| CN101992067A (en) | Preparation method and use of loofah sponge surface lead ion imprinted absorbing material | |
| CN102560120B (en) | Method for extracting gold from electronic waste leaching solution by using garlic wastes | |
| CN107617425A (en) | A kind of modified cocoanut shell and the method using vanadium in its reduction water body | |
| Du et al. | Facile fabrication of tannic acid functionalized microcrystalline cellulose for selective recovery of Ga (III) and In (III) from potential leaching solution | |
| CN102899489A (en) | Method for recovering gold from electronic wastes by using solidified persimmon tannin | |
| CN104148022B (en) | Amine-modified persimmon tannin adsorbent, and preparation method and application thereof | |
| CN104445499A (en) | Method for adsorbing and recycling heavy metal cadmium by using metal adsorbent employing persimmon leaves as raw material | |
| CN107552015B (en) | Modified mangosteen shell and method for reducing vanadium in water body by using same | |
| CN111545167B (en) | Method for preparing silver ion selective adsorbent by using pasture | |
| CN111748103B (en) | Method for purifying humin in soil | |
| CN109610166B (en) | Chelate fiber, preparation method thereof and application thereof in preparing Au in electronic waste3+Application of separation and enrichment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20190128 |