CN1352310A - Technological method for reextracting gold from cyanide gold refining wast slag - Google Patents
Technological method for reextracting gold from cyanide gold refining wast slag Download PDFInfo
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- CN1352310A CN1352310A CN 01134738 CN01134738A CN1352310A CN 1352310 A CN1352310 A CN 1352310A CN 01134738 CN01134738 CN 01134738 CN 01134738 A CN01134738 A CN 01134738A CN 1352310 A CN1352310 A CN 1352310A
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- gold
- waste residue
- cyanide
- cyaniding
- pressure
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 81
- 239000010931 gold Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000002893 slag Substances 0.000 title abstract description 13
- MXZVHYUSLJAVOE-UHFFFAOYSA-N gold(3+);tricyanide Chemical compound [Au+3].N#[C-].N#[C-].N#[C-] MXZVHYUSLJAVOE-UHFFFAOYSA-N 0.000 title abstract description 8
- 238000007670 refining Methods 0.000 title abstract 3
- 239000002699 waste material Substances 0.000 claims abstract description 30
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- 230000003197 catalytic effect Effects 0.000 claims abstract description 12
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 9
- 239000011707 mineral Substances 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000002386 leaching Methods 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 8
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 8
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 235000010288 sodium nitrite Nutrition 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 235000010344 sodium nitrate Nutrition 0.000 claims description 3
- 239000004317 sodium nitrate Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 229910017464 nitrogen compound Inorganic materials 0.000 claims 1
- 150000002830 nitrogen compounds Chemical class 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract 1
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 14
- 150000002825 nitriles Chemical group 0.000 description 5
- 229910052683 pyrite Inorganic materials 0.000 description 5
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 5
- 239000011028 pyrite Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- 230000007096 poisonous effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 229910052951 chalcopyrite Inorganic materials 0.000 description 2
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052949 galena Inorganic materials 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- HJTAZXHBEBIQQX-UHFFFAOYSA-N 1,5-bis(chloromethyl)naphthalene Chemical compound C1=CC=C2C(CCl)=CC=CC2=C1CCl HJTAZXHBEBIQQX-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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Abstract
The present invention relates to metallurgical technology and technological process and features that gold is extracted from cyanide gold refining waste slag as material by means of catalytic oxidation process to leach gold wrapping mineral and the subsequent common cyanide gold refining process. The technological process is simple and can reach a gold extracting rate as high as 90 %. The present invention can reduce the harm of cyanide gold reinfing waste slag to environment while obtaining gold.
Description
Technical Field
The invention relates to a gold extraction technology and a process, in particular to a process method for extracting gold by using cyanidation gold extraction waste residue as a raw material.
Background
In the prior art, waste residue produced by extracting gold by a common cyanidation method often contains a certain amount of gold, some of which are as high as 5g/t, and if the waste residue is subjected to a grinding process, a calcination process or an oxidation pretreatment cyanidation process, the leaching rate of the gold is only 10-60% (see the documents of nonferrous metal ores, No.5,2000, P11-14; Kuai Ming et al, Vol.342, No.12 and P21-22), the leaching rate of the gold is not high, and the process is complex and difficult to industrialize. In addition, some gold extraction cyanide slags contain high pyrite, chalcopyrite, galena and poisonous sand, and such slags are pulled by cement plants to be used as auxiliary materials, and release a large amount of poisonous gases such as sulfur dioxide, arsenic trioxide and the like due to high-temperature combustion; some of the materials are piled near a mine, so that spontaneous combustion is easily caused and air pollution is easily caused; meanwhile, harmful metal ions contained in the cyanogen slag are easy to flow into water or soil, if the cyanogen slag is not treated, environmental pollution is caused, and gold in the cyanogen slag is wasted, so that the cyanogen slag is required to be treated, and waste materials are changed into valuable materials.
Disclosure of Invention
The invention aims to provide a process method for extracting gold again by using cyanide gold extraction waste residue as a raw material, which can further improve the leaching rate of gold and fully extract residual gold in the waste residue on one hand, and can prevent the pollution of cyanide residue to the surrounding environment on the other hand, thereby changing waste into valuable.
The purpose and task of the invention are realized by the following technical scheme: the invention selects cyaniding gold extraction waste residue as raw material, firstly uses catalytic oxidation method to leach mineral matter wrapping gold in cyanide residue, then uses cyaniding gold extraction method to extract gold, the steps of the process method are as follows:
(1) pouring a certain amount of cyaniding gold extraction waste residue into an autoclave, uniformly mixing the cyaniding gold extraction waste residue with water, adjusting the pH value of the solution to be 1.0-3.0, adding a divalent or more compound of 0.01-5mol/L/L nitrogen into the solution as a catalyst, and uniformly stirring;
(2) then pressing air or oxygen into the reaction kettle by using a high-pressure pump, and stopping pressurizing when the pressure in the kettle reaches 4-100 atmospheric pressures;
(3) starting a stirrer to stir the mixture uniformly, heating the mixture, and reacting the mixture at the temperature of 30-180 ℃;
(4) after the reaction is finished, reducing the pressure of the reaction kettle to atmospheric pressure, and then filtering;
(5) neutralizing the filter residue with lime water to pH of 10-12, adding sodium cyanide, leaching gold at normal temperature and pressure, and extracting gold from the gold leaching solution by an electrolytic method.
In order to further reduce the cost, the catalytic oxidation filtrate is neutralized by alkali to ensure that the pH value is 1-3, and then the filtrate is recycled
In the above process, the catalyst for catalytic oxidation may be any one of sodium nitrate, potassium nitrate, ammonium nitrate and sodium nitrite.
The present invention uses cyaniding gold extracting waste residue as material, and utilizes catalytic oxidation process to leach out the mineral matter coating gold from the waste residue, and then utilizes common cyaniding process to leach out gold, and the extraction rate of gold can be up to above 90%. The process can obtain valuable gold, change waste into valuable, and reduce the harm of cyaniding gold extraction waste residue to environment.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The working principle and the embodiment of the invention are explained in detail as follows:
the process steps of extracting gold again by using cyanidation gold extraction waste residue are as follows: firstly testing the gold content in the cyanogen slag, if the gold content is more than 1g/t, leaching the mineral matter wrapping gold in the cyanogen slag by utilizing catalytic oxidation reaction, and then extracting the gold by utilizing a common cyanidation gold extraction method. The reaction mechanism is as follows:
because the cyaniding gold extraction waste residue generally contains pyrite, limonite, chalcopyrite, galena, poisonous sand and the like, the minerals often wrap gold, and the gold in the minerals cannot be extracted by the common cyaniding gold extraction method. The invention adopts a catalytic oxidation method, compounds with more than two-valent nitrogen such as nitric acid, sodium nitrate, potassium nitrate, ammonium nitrate, sodium nitrite, Nitrogen Oxide (NO) and other substances with certain oxidizability are used as catalysts, and the sulfide such as pyrite in the cyanogen slag can be oxidized into ferric sulfate, and the catalytic oxidation reaction is as follows:
the newly generated nitric acid and nitrous acid can react with pyrite, so that the minerals such as pyrite and the like in the cyanide slag are catalytically oxidized into ferric sulfate in the presence of air or oxygen, gold can be dissociated from the minerals, then sodium cyanide is added, the gold is leached at normal temperature and normal pressure, and the gold is extracted from the gold leaching solution by a conventional electrolytic method. In order to further reduce the cost, the catalytic oxidation filtrate is neutralized by alkali to enable the pH value to be 1-3, and then the catalytic oxidation filtrate can be recycled.
The reaction vessel used in the above process is required to be resistant to oxidation and acid.
Example (b):
example 1: putting 60% of cyaniding gold extraction waste residue containing 1g/t of gold into a reaction kettle, uniformly mixing the waste residue with 40% of water, then adding 5mol/L of catalyst nitric acid, and adjusting the pH value of the solution to 3.0; pressing air into the reaction kettle by using a high-pressure pump, wherein the pressure reaches 100 atmospheric pressures, and then heating the reactants to 30 ℃ for reaction for 4 hours; when the cyanide gold extraction waste residue is completely oxidized, filtering is carried out, the filter residue is neutralized to the pH value of 10 by lime water, then 2kg of sodium cyanide is added into each ton of cyanide residue, gold is extracted by using a common cyanidation method at normal temperature and normal pressure, and gold is extracted by using an electrolytic method from gold leaching liquid. The leaching rate of gold is as high as 90%.
Example 2:
30 percent of cyaniding gold extraction waste residue containing 5g/t of gold is put into a reaction kettle, 70 percent of water is added and evenly stirred, then 2mol/L of catalyst sodium nitrite is added, the PH value of the solution is adjusted to 2.0 by acid, air is pressed into the reaction kettle by a high-pressure pump, the pressure reaches 50 atm, and the reactant is heated to 120 ℃ for reaction for 8 hours. When the cyanide gold extraction waste residue is completely oxidized, filtering is carried out, the filter residue is neutralized to the PH value of 11 by lime water, then 4kg of sodium cyanide is added into each ton of cyanide residue, gold is extracted by using a common cyanidation method at normal temperature and normal pressure, and gold is extracted by using an electrolytic method from gold leaching liquid. The gold leaching rate is as high as 94%.
Example 3:
putting 10% of cyanidation gold extraction residue containing 3g/t gold into a reaction kettle, adding 90% of water, uniformly stirring, adding 0.01mol/L of ammonium nitrate serving as a catalyst, adjusting the pH value of the solution to 3.0 by using acid, pressing air into the reaction kettle by using a high-pressure pump until the pressure reaches 4 atmospheric pressures, heating the reactant to 180 ℃, and reacting for 8 hours. When cyanide gold extraction waste residue is completely oxidized, filtering to obtain reaction residue, neutralizing filter residue to pH value of 12 with lime water, adding 4kg sodium cyanide per ton of cyanide residue, leaching gold at normal temperature and normal pressure by using a common cyanide process, and extracting gold from the gold leaching solution by using an electrolytic process. The gold leaching rate is as high as 92%.
Claims (3)
1. A process for extracting gold from the waste dregsgenerated by cyaniding gold extraction includes such steps as catalytic oxidizing to extract the mineral substance wrapping gold, cyaniding gold extraction to obtain gold, and features that:
(1) pouring a certain amount of cyaniding gold extraction waste residue into an autoclave, uniformly mixing the cyaniding gold extraction waste residue with water, adjusting the pH value of the solution to 1.0-3.0, adding more than two-valent nitrogen compounds of 0.01-5mol/L into the solution as a catalyst, and uniformly stirring;
(2) then pressing air or oxygen into the reaction kettle by using a high-pressure pump, and stopping pressurizing when the pressure in the kettle reaches 4-100 atmospheric pressures;
(3) starting a stirrer to stir the mixture uniformly, opening a heating system, and reacting for 4-10 hours at the temperature of 30-180 ℃;
(4) after the reaction is finished, reducing the pressure in the reaction kettle to atmospheric pressure, and then filtering;
(5) neutralizing the filter residue with lime water to a pH value of 10-12, adding sodium cyanide, leaching gold at normal temperature and normal pressure, and extracting gold from the gold leaching solution by an electrolytic method.
2. The process method for re-extracting gold from cyanided gold extraction waste residue according to claim 1, characterized in that the filtrate obtained after filtration in the step (4) is neutralized by alkali to make the pH value of the filtrate be 1-3 and then recycled.
3. The process method for extracting gold again from cyanided gold extraction waste residue according to claim 1 or 2, characterized in that the catalyst for catalytic oxidation is any one of sodium nitrate, potassium nitrate, ammonium nitrate and sodium nitrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011347384A CN1172009C (en) | 2001-11-09 | 2001-11-09 | Technological method for reextracting gold from cyanide gold refining wast slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011347384A CN1172009C (en) | 2001-11-09 | 2001-11-09 | Technological method for reextracting gold from cyanide gold refining wast slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1352310A true CN1352310A (en) | 2002-06-05 |
| CN1172009C CN1172009C (en) | 2004-10-20 |
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|---|---|---|---|
| CNB011347384A Expired - Fee Related CN1172009C (en) | 2001-11-09 | 2001-11-09 | Technological method for reextracting gold from cyanide gold refining wast slag |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450826B (en) * | 2007-12-04 | 2011-07-20 | 王安理 | Cyanogens-containing sewage water multiple-effect vacuum evaporation recovery method and recovery device |
| CN102251101A (en) * | 2011-07-01 | 2011-11-23 | 长春黄金研究院 | Process for extracting gold from carbonaceous gold concentrate |
| CN102002601B (en) * | 2009-08-28 | 2012-10-03 | 山东金洲矿业集团有限公司 | Method for extracting gold and silver |
| CN105121676A (en) * | 2013-04-24 | 2015-12-02 | 田中贵金属工业株式会社 | Method for collecting valuable metal |
| CN105349797A (en) * | 2014-08-20 | 2016-02-24 | 中国科学院过程工程研究所 | Method for carrying out pre-treatment desilication gold leaching of gold-containing tailings or cyanidation tailings |
| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
Families Citing this family (1)
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| CN100406591C (en) * | 2006-10-31 | 2008-07-30 | 东华大学 | Method for extracting metal copper from electronical wastes |
-
2001
- 2001-11-09 CN CNB011347384A patent/CN1172009C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450826B (en) * | 2007-12-04 | 2011-07-20 | 王安理 | Cyanogens-containing sewage water multiple-effect vacuum evaporation recovery method and recovery device |
| CN102002601B (en) * | 2009-08-28 | 2012-10-03 | 山东金洲矿业集团有限公司 | Method for extracting gold and silver |
| CN102251101A (en) * | 2011-07-01 | 2011-11-23 | 长春黄金研究院 | Process for extracting gold from carbonaceous gold concentrate |
| CN102251101B (en) * | 2011-07-01 | 2012-12-26 | 长春黄金研究院 | Process for extracting gold from carbonaceous gold concentrate |
| CN105121676A (en) * | 2013-04-24 | 2015-12-02 | 田中贵金属工业株式会社 | Method for collecting valuable metal |
| CN105121676B (en) * | 2013-04-24 | 2017-03-22 | 田中贵金属工业株式会社 | Method for collecting valuable metal |
| CN105349797A (en) * | 2014-08-20 | 2016-02-24 | 中国科学院过程工程研究所 | Method for carrying out pre-treatment desilication gold leaching of gold-containing tailings or cyanidation tailings |
| CN105349797B (en) * | 2014-08-20 | 2018-05-22 | 中国科学院过程工程研究所 | A kind of method containing golden tailing or cyanidation tailings pretreatment desiliconization leaching gold |
| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
| US11578386B2 (en) | 2020-08-18 | 2023-02-14 | Enviro Metals, LLC | Metal refinement |
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| Publication number | Publication date |
|---|---|
| CN1172009C (en) | 2004-10-20 |
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