JP6463175B2 - Activated carbon regeneration method and gold recovery method - Google Patents
Activated carbon regeneration method and gold recovery method Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 311
- 239000010931 gold Substances 0.000 title claims description 112
- 229910052737 gold Inorganic materials 0.000 title claims description 110
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims description 108
- 238000000034 method Methods 0.000 title claims description 43
- 238000011069 regeneration method Methods 0.000 title claims description 19
- 238000011084 recovery Methods 0.000 title claims description 18
- 239000000243 solution Substances 0.000 claims description 89
- 238000004140 cleaning Methods 0.000 claims description 86
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- 238000005406 washing Methods 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 238000002386 leaching Methods 0.000 claims description 22
- 230000002378 acidificating effect Effects 0.000 claims description 21
- 238000001179 sorption measurement Methods 0.000 claims description 21
- 229910052802 copper Inorganic materials 0.000 claims description 16
- 239000010949 copper Substances 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000010828 elution Methods 0.000 claims description 8
- 150000001450 anions Chemical class 0.000 claims description 7
- 150000001768 cations Chemical class 0.000 claims description 7
- 229910052976 metal sulfide Inorganic materials 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 description 37
- 230000000694 effects Effects 0.000 description 35
- 235000011121 sodium hydroxide Nutrition 0.000 description 14
- 230000004913 activation Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 230000001172 regenerating effect Effects 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000008235 industrial water Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- -1 gold ions Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 150000003388 sodium compounds Chemical class 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 241000416536 Euproctis pseudoconspersa Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XEIPQVVAVOUIOP-UHFFFAOYSA-N [Au]=S Chemical compound [Au]=S XEIPQVVAVOUIOP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 150000002343 gold Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 150000003385 sodium Chemical class 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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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
- 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
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
この発明は、金を回収するために金を一時的に吸着させることに用いられた使用後の活性炭を、再度の金の吸着に用いるために再生させる活性炭の再生方法及び、金の回収方法に関するものであり、特には、使用後の活性炭を、高い活性度で再生させることのできる技術を提案するものである。 TECHNICAL FIELD The present invention relates to a method for regenerating activated carbon used for temporarily adsorbing gold to recover gold, and regenerating the activated carbon for use in re-adsorbing gold, and a method for recovering gold. In particular, the present invention proposes a technique capable of regenerating activated carbon after use with high activity.
たとえば、含金硫化金属鉱に含まれる金を回収する方法としては、特許文献１、２に記載されたもの等がある。
これらの特許文献１、２に記載された方法では、はじめに、アニオンとして塩化物イオン及び／又は臭化物イオンを含み、カチオンとして銅及び鉄を含む酸性浸出液を用いて、含金硫化金属鉱から金を前記酸性浸出液に加温浸出し、次いで、酸性浸出液中の金を活性炭に吸着させ、その後、活性炭に吸着させた金をアルカリ液で溶離させる。かかる金の回収方法によれば、硫化金属鉱に含まれる金を安価に効率良く回収することができる。
For example, as a method for recovering gold contained in a metal-containing sulfide metal ore, there are methods described in
In the methods described in these
このような金の回収方法で、酸性浸出液中の金を一時的に吸着させる吸着材として用いられた使用後の活性炭は、活性度が低下していることから、再度の金の吸着に繰り返し用いるには再生処理を施すことが必要となる。 In such a gold recovery method, activated carbon after use used as an adsorbent for temporarily adsorbing gold in the acid leaching solution is used repeatedly for re-adsorption of gold because its activity is reduced. It is necessary to perform a reproduction process.
使用後の活性炭の再生処理として通常は、特許文献３に記載されているように、使用後の活性炭を非酸化雰囲気の下、２５０℃程度の温度で加熱して再活性化する、いわゆる賦活処理により、使用後の活性炭の吸着性能を回復させることが行われている。 As the regeneration treatment of activated carbon after use, normally, as described in Patent Document 3, the activated carbon after use is reactivated by heating at a temperature of about 250 ° C. in a non-oxidizing atmosphere. Thus, the adsorption performance of activated carbon after use is recovered.
しかしながら、上述したような非酸化雰囲気下で高加熱する賦活処理によっては、再生される活性炭の活性度を、未使用時の活性炭の活性度の６０％程度にしか高めることができず、その吸着性能が十分に回復しないことが解かった。
それ故に、そのような賦活処理により再生された活性炭を、先述の金の回収方法における金の吸着に用いた場合は、その活性炭に、酸性浸出液に浸出した金が十分に吸着しない結果として、金の回収率を所期したほどに向上させることができなかった。
However, depending on the activation treatment with high heating in the non-oxidizing atmosphere as described above, the activity of the activated carbon to be regenerated can only be increased to about 60% of the activity of the activated carbon when not used, and its adsorption It was found that the performance did not fully recover.
Therefore, when the activated carbon regenerated by such activation treatment is used for the adsorption of gold in the gold recovery method described above, the gold leached in the acidic leachate is not sufficiently adsorbed on the activated carbon. The recovery rate could not be improved as expected.
この発明は、このような問題を解決することを課題とするものであり、それの目的とするところは、使用後の活性炭を、先に述べた賦活処理よりも高い活性度に再生させ、活性炭を有効に繰り返し用いることを可能にする活性炭の再生方法及び、金の回収方法を提供することにある。 An object of the present invention is to solve such problems, and the object of the present invention is to regenerate the activated carbon after use to a higher activity than the activation treatment described above, It is an object of the present invention to provide a method for regenerating activated carbon and a method for recovering gold.
発明者は鋭意検討の結果、使用後の活性炭をアルカリ性洗浄液または中性洗浄液で洗浄し、さらに、洗浄後のアルカリ性洗浄液または中性洗浄液がアルカリ性領域または中性領域に維持されるように、使用後の活性炭の洗浄条件を調整することにより、その活性炭の活性度を大きく高めることができることを見出した。 As a result of intensive studies, the inventor washed the activated carbon after use with an alkaline cleaning solution or a neutral cleaning solution, and further maintained the alkaline cleaning solution or neutral cleaning solution after use so as to maintain it in the alkaline region or neutral region. It has been found that the activity of the activated carbon can be greatly increased by adjusting the cleaning conditions of the activated carbon.
これは、活性炭を上述したような金の吸着に用いたことによって、その使用後の活性炭の表面に付着していたナトリウムイオンないしナトリウム化合物のナトリウム等が、アルカリ性洗浄液または中性洗浄液による洗浄により除去されて、活性炭表面が露出することに起因すると考えられるが、このような理論により限定されることを意図するものではない。 This is because activated carbon is used for the adsorption of gold as described above, so that sodium ions or sodium of sodium compounds adhering to the surface of the activated carbon after use are removed by washing with an alkaline washing solution or a neutral washing solution. It is believed that this is due to the exposed surface of the activated carbon, but is not intended to be limited by such a theory.
このような知見に基き、この発明の活性炭の再生方法は、金が吸着した活性炭から当該金を溶離させた後、金を溶離させた使用後の活性炭を、金の吸着に再利用するために活性炭を再生する方法であって、金が吸着した活性炭から、シアン溶液を用いて当該金を溶離させた後の、使用後の活性炭を対象とし、前記使用後の活性炭をアルカリ性洗浄液である苛性ソーダ水溶液で洗浄し、その洗浄後のアルカリ性洗浄液をアルカリ性領域とすることにある。
Based on such knowledge, the activated carbon regeneration method of the present invention is to elute the gold from the activated carbon on which gold is adsorbed, and then reuse the activated carbon after the gold is eluted for the adsorption of gold. A method for regenerating activated carbon, which is intended for activated carbon after use after elution of the gold from activated carbon adsorbed with gold using a cyan solution, and the activated carbon after use is an aqueous solution of caustic soda that is an alkaline cleaning solution in washing is to alkaline area an alkaline washing liquid after the washing.
ここで好ましくは、前記洗浄後のアルカリ性洗浄液のｐＨを８〜１２とする。
また、前記苛性ソーダ水溶液のモル濃度は、０．１ｍｏｌ／Ｌ〜２．０ｍｏｌ／Ｌとすることが好適である。
Preferably herein, and 8 to 12 the pH of the alkaline washing solution after the washing.
The molar concentration before Symbol caustic soda aqueous solution is preferably set to 0.1mol / L~2.0mol / L.
上記の再生方法で、使用後の活性炭をアルカリ性洗浄液で洗浄するに当っては、前記使用後の活性炭をカラム内に充填し、該カラム内にアルカリ性洗浄液を流すことが好ましい。
また、金を含む液中の金を活性炭に吸着させ、次いで、金が吸着した前記活性炭から当該金を溶離させた後の、使用後の活性炭を対象とすることが好ましく、この場合、前記金を含む液が、アニオンとして塩化物イオン及び／又は臭化物イオンを含むとともにカチオンとして銅及び鉄を含む酸性浸出液に、含金硫化金属鉱に含まれる金を加温浸出させて得られた液であることが好適である。
In the above-described regeneration method, the activated carbon after use hitting the washing with an alkaline washing solution, the activated carbon after the use was packed into a column, it is preferred to flow the alkaline cleaning solution into the column.
Also, the gold in the liquid containing the gold is adsorbed on the activated carbon, then gold after eluting the gold from the activated carbon adsorption, it is preferable to subject the activated carbon after use, in this case, the The liquid containing gold is a liquid obtained by warming and leaching gold contained in a metal-containing metal sulfide ore into an acidic leaching solution containing chloride ions and / or bromide ions as anions and copper and iron as cations. Preferably it is.
この発明の金の回収方法は、アニオンとして塩化物イオン及び／又は臭化物イオンを含み、かつ、カチオンとして銅及び鉄を含む酸性浸出液に、含金硫化金属鉱に含まれる金を加温浸出させる金浸出工程と、前記酸性浸出液に浸出した金を活性炭に吸着させる金吸着工程と、前記活性炭に吸着した金を溶離させる金溶離工程とを備える金の回収方法であって、前記活性炭として、上述したいずれかの活性炭の再生方法により再生させた活性炭を用いることにある。 The method for recovering gold according to the present invention provides a gold leaching solution containing gold ions contained in a metal-containing metal sulfide ore in an acidic leaching solution containing chloride ions and / or bromide ions as anions and copper and iron as cations. A gold recovery method comprising a leaching step, a gold adsorption step for adsorbing gold leached in the acidic leachate on activated carbon, and a gold elution step for eluting gold adsorbed on the activated carbon, wherein the activated carbon is described above. It is to use activated carbon regenerated by any of the activated carbon regeneration methods.
この発明の活性炭の再生方法によれば、使用後の活性炭をアルカリ性洗浄液で洗浄し、その洗浄後のアルカリ性洗浄液をアルカリ性領域とすることにより、使用後の活性炭の活性度を大きく高めることができる。
また、この発明の金の回収方法によれば、上記の再生方法により吸着性能が十分に回復した活性炭を有効に用いることができる。
According to the activated carbon regeneration process of the present invention, the activated carbon after use were washed with an alkaline washing liquid, by an alkaline wash solution after the washing with the alkaline area, greatly enhance the activity of the activated carbon after use Can do.
In addition, according to the gold recovery method of the present invention, activated carbon whose adsorption performance is sufficiently recovered by the above regeneration method can be used effectively.
以下に、この発明の実施の形態について詳細に説明する。
ここで開示する活性炭の再生方法は、金が吸着した活性炭から当該金を溶離させた後、金を溶離させた使用後の活性炭を、金の吸着に再利用するために活性炭を再生する方法であって、前記使用後の活性炭をアルカリ性洗浄液または中性洗浄液で洗浄し、その洗浄後のアルカリ性洗浄液または中性洗浄液をアルカリ性領域または中性領域とする。
Hereinafter, embodiments of the present invention will be described in detail.
The activated carbon regeneration method disclosed herein is a method in which after the gold is adsorbed from the activated carbon on which gold is adsorbed, the activated carbon after use after eluting the gold is regenerated for reuse in gold adsorption. there are, activated carbon after the use was washed with an alkaline washing solution or neutral cleaning solution, you the alkaline washing solution or a neutral washing liquid after the washing with the alkaline region or neutral region.
（使用後の活性炭）
活性炭としては、金を吸着させる吸着材として通常用いられているもの、たとえば、木材、椰子殻その他の炭素質原料を多孔質原料に変化させる賦活処理等の物理法又は、化学薬品を用いた化学法等により製造された一般的な活性炭を対象とすることができる。
特に、この発明の再生方法では、金の回収方法で、金を一時的に吸着させるために用いられて、吸着した金を溶離させた後の活性炭を対象とし、ここでは、これを使用後の活性炭という。
(Activated carbon after use)
As the activated carbon, those usually used as an adsorbent for adsorbing gold, for example, physical methods such as activation treatment for changing a carbonaceous raw material such as wood, coconut shell or the like into a porous raw material, or chemical using chemicals. General activated carbon produced by the method or the like can be targeted.
In particular, the regeneration method of the present invention targets activated carbon that has been used to temporarily adsorb gold in the gold recovery method and has eluted the adsorbed gold. It is called activated carbon.
（洗浄液）
金の回収に用いられた使用後の活性炭は、その金の回収で、吸着した金を、シアン溶液等を用いて溶離させたことに起因して、アルカリ性領域となっていることがある。
このような使用後の活性炭を、所要に応じて乾燥させた後、アルカリ性洗浄液または中性洗浄液を用いて洗浄する。
(Cleaning solution)
The used activated carbon used for the recovery of gold may be in an alkaline region due to elution of the adsorbed gold using a cyan solution or the like in the recovery of the gold.
Such activated carbon after use, after drying if desired, washing with A alkali washing solution or a neutral cleaning solution.
ここにおいて、使用後の活性炭をアルカリ性洗浄液または中性洗浄液で洗浄した後、その洗浄終了時に、そのアルカリ性洗浄液または中性洗浄液がアルカリ性領域または中性領域、すなわちアルカリ性洗浄液または中性洗浄液のｐＨが７以上となるように、使用後の活性炭の状態に応じて、アルカリ性洗浄液または中性洗浄液の種類や濃度、洗浄時間その他の条件を調整する。
つまり、使用後の活性炭を洗浄した後のアルカリ性洗浄液または中性洗浄液が、洗浄によって酸性領域となることがないように、各種条件をコントロールする。
Here, after the used activated carbon is washed with an alkaline cleaning solution or a neutral cleaning solution, at the end of the cleaning, the alkaline cleaning solution or neutral cleaning solution is in an alkaline region or neutral region, that is, the pH of the alkaline cleaning solution or neutral cleaning solution is 7 As described above, the type and concentration of the alkaline cleaning liquid or neutral cleaning liquid, the cleaning time and other conditions are adjusted according to the state of the activated carbon after use.
That is, various conditions are controlled so that the alkaline cleaning liquid or neutral cleaning liquid after cleaning the used activated carbon does not become an acidic region by cleaning.
それにより、金の回収方法で用いられた際に活性炭表面に付着して残留していたナトリウムイオンないしナトリウム化合物のナトリウムが、このアルカリ性洗浄液または中性洗浄液による洗浄で除去される結果として、使用後の活性炭の、金の吸着に寄与する表面が露出すると考えられる。
その結果として、先述したような非酸化雰囲気かつ高温下での賦活処理に比して、使用後の活性炭の活性度を大きく高めることができ、その吸着性能を有効に回復させることができる。
As a result, sodium ions or sodium compounds remaining on the activated carbon surface when used in the gold recovery method are removed by washing with this alkaline cleaning solution or neutral cleaning solution. It is thought that the surface of the activated carbon that contributes to the adsorption of gold is exposed.
As a result, the activity of the activated carbon after use can be greatly increased as compared with the activation treatment in a non-oxidizing atmosphere and at a high temperature as described above, and the adsorption performance can be effectively recovered.
なお仮に、使用後の活性炭を酸性洗浄液で洗浄した場合であって、使用後の活性炭がそもそもアルカリ性であったことに起因して、その使用後の活性炭の洗浄が終了した際に前記酸性洗浄液が中性ないしアルカリ性となった場合は、使用後の活性炭表面に付着していた銅、鉄等の金属が一旦溶解した後に再析出して、活性炭の細孔を覆うと考えられるので、使用後の活性炭の活性度を有効に高めることができない。
これに対し、ここで述べる方法では、使用後の活性炭をアルカリ性洗浄液または中性洗浄液で洗浄し、洗浄後のアルカリ性洗浄液または中性洗浄液をアルカリ性領域または中性領域とすることにより、使用後の活性炭表面に付着していた銅、鉄等の金属がそもそも溶解せず、洗浄前に付着していたままの状態が維持されるので、活性炭表面のナトリウム等が除去された分、活性度を有効に向上させることができる。なお、使用後の活性炭に吸着していた鉄や銅等は、再析出等せず、使用時に付着した箇所に変わらず存在するのであれば、活性度の増減に大きな影響を及ぼさないと考えられる。
In addition, if the activated carbon after use is washed with an acidic cleaning liquid, the acidic cleaning liquid is used when the activated carbon after use is finished because the activated carbon after use is alkaline in the first place. If it becomes neutral or alkaline, it is thought that the metal such as copper and iron that has adhered to the activated carbon surface after use once dissolved and then re-deposited, and covers the pores of the activated carbon. The activity of activated carbon cannot be increased effectively.
In contrast, in the method described here, by the activated carbon after use were washed with an alkaline washing solution or neutral cleaning solution, the alkaline washing solution or a neutral washing liquid after washing the alkaline region or neutral region, after use Metals such as copper and iron adhering to the activated carbon surface do not dissolve in the first place, and the state of adhering before cleaning is maintained, so the activity is effective as much as sodium etc. on the activated carbon surface is removed. Can be improved. In addition, it is considered that iron and copper adsorbed on the activated carbon after use do not reprecipitate, etc., and do not significantly affect the increase or decrease of activity if they remain in the place attached at the time of use. .
ここで、使用後の活性炭表面に付着しているナトリウム等をより効果的に取り除いて、再生処理後の活性炭の活性度をさらに高めるため、洗浄終了時の洗浄液のｐＨは７〜１２とすることが好ましく、さらにこのｐＨを８〜１２とすることがより一層好ましい。言い換えれば、洗浄後の洗浄液のｐＨが小さすぎる場合は、アルカリ性領域となった洗浄後の洗浄液のｐＨを下げるために弱酸を添加すると、使用後の活性炭に付着していた銅や鉄等が一旦溶解した後に析出して、活性炭表面を再度覆うことから、活性度を大きく高めることができない可能性がある。この一方で、当該ｐＨが大きすぎる場合は、アルカリ性洗浄液後の流水洗浄を行ったときに、活性炭に付着した水酸化ナトリウムが十分に除去されずに活性炭に残留することがあり、この活性炭を金の吸着に再利用すると、残留した苛性、あるいはＡｕ溶液中のＣｕ、Ｆｅがアルカリで析出してＡｕ吸着が阻害されるおそれがある。 Here, the pH of the cleaning liquid at the end of cleaning should be 7 to 12 in order to more effectively remove sodium attached to the activated carbon surface after use and further increase the activity of the activated carbon after the regeneration treatment. It is more preferable that the pH is 8-12. In other words, if the pH of the cleaning solution after cleaning is too small, adding weak acid to lower the pH of the cleaning solution after cleaning that has become an alkaline region will temporarily remove the copper, iron, etc. attached to the activated carbon after use. Since it precipitates after dissolution and covers the activated carbon surface again, there is a possibility that the activity cannot be greatly increased. On the other hand, when the pH is too high, sodium hydroxide adhering to the activated carbon may remain in the activated carbon without being sufficiently removed when washed with running water after the alkaline cleaning liquid. If it is reused for adsorption, residual Causticity, or Cu and Fe in the Au solution may be precipitated by alkali, and Au adsorption may be inhibited.
またここで、上記のアルカリ性洗浄液としては、苛性ソーダ水溶液の他、様々なアルカリ性の溶液を用いることができる。また中性洗浄液としては水を挙げることができる。
なかでも、再生後の活性炭を、後述する金の回収方法に使用する場合は、苛性ソーダ水溶液または水を用いることが好ましい。
Here, as the above alkaline cleaning liquid, various alkaline solutions can be used in addition to a caustic soda aqueous solution. An example of the neutral cleaning liquid is water.
Especially, when using the activated carbon after reproduction | regeneration for the collection | recovery method of the gold | metal | money mentioned later, it is preferable to use caustic soda aqueous solution or water.
アルカリ性洗浄液または中性洗浄液のモル濃度は、好ましくは０ｍｏｌ／Ｌ〜２．０ｍｏｌ／Ｌ、より好ましくは０ｍｏｌ／Ｌ〜１．０ｍｏｌ／Ｌとすることができる。
特に、アルカリ性洗浄液または中性洗浄液として、苛性ソーダ水溶液を選択する場合は、苛性ソーダ水溶液のモル濃度は、０．１ｍｏｌ／Ｌ〜２．０ｍｏｌ／Ｌとすることが好適である。苛性ソーダ水溶液のモル濃度が高すぎる場合は、苛性ソーダのナトリウムが洗浄時に活性炭表面に付着する可能性があり、このナトリウムが活性度の向上を阻害するおそれがある。
アルカリ性洗浄液または中性洗浄液として、水を選択する場合は、具体的には、水道水、工業用水、蒸留水、精製水、イオン交換水、純水、超純水等を用いることができる。
The molar concentration of the alkaline cleaning liquid or the neutral cleaning liquid is preferably 0 mol / L to 2.0 mol / L, more preferably 0 mol / L to 1.0 mol / L.
In particular, when a caustic soda aqueous solution is selected as the alkaline cleaning solution or the neutral cleaning solution, the molar concentration of the caustic soda aqueous solution is preferably 0.1 mol / L to 2.0 mol / L. When the molar concentration of the aqueous caustic soda solution is too high, sodium of caustic soda may adhere to the activated carbon surface during cleaning, and this sodium may hinder the activity improvement.
When water is selected as the alkaline cleaning liquid or neutral cleaning liquid, specifically, tap water, industrial water, distilled water, purified water, ion-exchanged water, pure water, ultrapure water, or the like can be used.
そしてまた、使用後の活性炭を洗浄する際の、活性炭のアルカリ性洗浄液または中性洗浄液中のパルプ濃度は、洗浄後の活性炭の活性度をより有効に高めるとの観点からは低いほうが好ましく、具体的には、１００ｇ／Ｌ〜４００ｇ／Ｌとすることが好適である。パルプ濃度が４００ｇ／Ｌを超えると、活性度がそれほど大きく向上しないことがある。なおここで、パルプ濃度とは、使用後の活性炭の乾燥重量（ｇ）を、洗浄に用いるアルカリ性洗浄液または中性洗浄液の体積（Ｌ）で除したものである。 In addition, when washing the activated carbon after use, the pulp concentration in the alkaline washing solution or neutral washing solution of activated carbon is preferably lower from the viewpoint of more effectively increasing the activity of the activated carbon after washing. Is preferably 100 g / L to 400 g / L. If the pulp concentration exceeds 400 g / L, the activity may not be greatly improved. Here, the pulp concentration is obtained by dividing the dry weight (g) of the activated carbon after use by the volume (L) of the alkaline cleaning solution or neutral cleaning solution used for cleaning.
このようなアルカリ性洗浄液または中性洗浄液による洗浄は、たとえば、使用後の活性炭をアルカリ性洗浄液または中性洗浄液に浸漬させるとともに、撹拌して又は撹拌せずに洗うことにより行う他、使用後の活性炭を、円筒状等のカラムに充填し、そのカラム内にアルカリ性洗浄液または中性洗浄液を通して通液することにより行うことができる。なお後者の場合、カラムを通過したアルカリ性洗浄液または中性洗浄液を洗浄後のアルカリ性洗浄液または中性洗浄液として、そのｐＨを測定し、また、その測定値に基いて、カラムを通過させるアルカリ性洗浄液または中性洗浄液の濃度や通液速度を変化させる等の調整を行うことで、洗浄終了時のアルカリ性洗浄液または中性洗浄液のｐＨを制御することができる。 Cleaning with such an alkaline cleaning solution or neutral cleaning solution is performed by, for example, immersing activated carbon after use in an alkaline cleaning solution or neutral cleaning solution and washing it with or without stirring. It can be carried out by filling a cylindrical column or the like and passing the alkaline cleaning liquid or neutral cleaning liquid through the column. In the latter case, the alkaline cleaning liquid or neutral cleaning liquid that has passed through the column is measured as the alkaline cleaning liquid or neutral cleaning liquid after cleaning, and the alkaline cleaning liquid or medium that passes through the column is measured based on the measured value. The pH of the alkaline cleaning solution or neutral cleaning solution at the end of cleaning can be controlled by making adjustments such as changing the concentration of the basic cleaning solution and the flow rate.
なお、このようなアルカリ性洗浄液または中性洗浄液による洗浄に先立って、使用後の活性炭に賦活処理を施すことも可能である。この賦活処理では、使用後の活性炭に対し、たとえば水蒸気雰囲気の下、２００〜３００℃で加熱処理を施して再活性化させる。 Prior to cleaning with such an alkaline cleaning solution or neutral cleaning solution, the activated carbon after use can be subjected to an activation treatment. In this activation treatment, the activated carbon after use is reactivated by, for example, heat treatment at 200 to 300 ° C. in a steam atmosphere.
（再生させた活性炭）
このようにして再生された活性炭の活性度は、たとえば、金含有溶液中に活性炭を投入し、活性炭に金を吸着させる試験を行い、それにより得られた測定値を用いて、以下のＦｌｅｍｉｎｇの式（１）から算出することができる。
ｑ＝ｋ×ｃ×ｔn 式（１）
ここで式（１）中、ｋは炭素活性度、ｑは活性炭に付着した金の量（ｇ／ｔ）、ｃは溶液中の金の濃度（ｇ／Ｌ）、ｔは吸着時間（ｈｒ）、ｎは定数をそれぞれ示す。
(Regenerated activated carbon)
The activity of the activated carbon thus regenerated can be determined by, for example, performing a test in which activated carbon is introduced into a gold-containing solution and gold is adsorbed on the activated carbon. It can be calculated from equation (1).
q = k × c × t n Formula (1)
Here, in formula (1), k is the carbon activity, q is the amount of gold attached to the activated carbon (g / t), c is the concentration of gold in the solution (g / L), and t is the adsorption time (hr). , N each represents a constant.
この式（１）より活性度ｋを算出することができる。より詳細には、たとえば、所定の試験時間（２時間）内に複数回にわたって定期的に液サンプルを採取し、それらの液サンプルの測定値を、ｑ／ｃとｔの関係を表すグラフにプロットして累積近似することで、Ｆｌｅｍｉｎｇの式（１）と同じ形の近似式を得ることができ、この近似式からｋやｎを求めることができる。 The activity k can be calculated from this equation (1). More specifically, for example, liquid samples are periodically taken a plurality of times within a predetermined test time (2 hours), and the measured values of the liquid samples are plotted on a graph representing the relationship between q / c and t. By accumulative approximation, an approximate expression having the same form as Fleming's expression (1) can be obtained, and k and n can be obtained from this approximate expression.
そして、この発明の再生方法により再生された活性炭の、上記の式（１）から算出した活性度は、未使用の活性炭の同様の活性度に対し、たとえば８０％以上に高めることが可能である。
一方、非酸化雰囲気かつ高温下での賦活処理のみで再生された活性炭の同様の活性度は一般に、未使用の活性炭の同様の活性度に対して６０％程度又は、それ以下となる。
そのため、この発明の再生方法によれば、賦活処理による再生方法に比して、再生された活性炭の活性度を大きく高めることができる。
And the activity computed from said formula (1) of activated carbon regenerated by the regeneration method of this invention can be raised to 80% or more with respect to the same activity of unused activated carbon, for example. .
On the other hand, the similar activity of the activated carbon regenerated only by the activation treatment in a non-oxidizing atmosphere and at a high temperature is generally about 60% or less with respect to the similar activity of the unused activated carbon.
Therefore, according to the regeneration method of the present invention, the activity of the regenerated activated carbon can be greatly increased as compared with the regeneration method by activation treatment.
以上に述べた再生方法により再生された活性炭を用いる金の回収方法は、図１に例示するように、アニオンとして塩化物イオン及び／又は臭化物イオンを含み、かつ、カチオンとして銅及び鉄を含む酸性浸出液に、含金硫化金属鉱に含まれる金を加温浸出させる金浸出工程と、前記酸性浸出液に浸出した金を活性炭に吸着させる金吸着工程と、前記活性炭に吸着した金を溶離させる金溶離工程とを備えるものである。
この回収方法の実施形態は具体的には以下のとおりである。
As shown in FIG. 1, the gold recovery method using activated carbon regenerated by the regeneration method described above includes chloride ions and / or bromide ions as anions, and an acid containing copper and iron as cations. A gold leaching step for warming and leaching gold contained in the metal-containing metal sulfide ore into the leachate, a gold adsorption step for adsorbing the gold leached in the acidic leachate to activated carbon, and a gold elution for eluting the gold adsorbed on the activated carbon A process.
The embodiment of this recovery method is specifically as follows.
（金浸出工程）
金を含む硫化金属鉱を破砕後、必要に応じて浮遊選鉱法により精鉱とし、この含金硫化金属鉱に含まれる金を、アニオンとして塩化物イオン及び／又は臭化物イオンを含み、かつ、カチオンとして銅及び鉄を含む酸性浸出液中に加温浸出する。ここで、浸出温度は６０℃〜１００℃とすることができ、酸性浸出液のｐＨは０〜１．９とすることができる。また、酸性浸出液は、塩化物イオンと臭化物イオンとをそれぞれ２０〜２００ｇ／Ｌで含み、銅と鉄とをそれぞれ０.０１〜３０ｇ／Ｌで含むことが好ましい。
(Gold leaching process)
After crushing gold sulfide ore containing gold, if necessary, it is made into concentrate by the flotation method, gold contained in this metal sulfide containing metal ore contains chloride ions and / or bromide ions as anions, and cation As a hot leaching in an acidic leachate containing copper and iron. Here, the leaching temperature can be 60 ° C. to 100 ° C., and the pH of the acidic leaching solution can be 0 to 1.9. The acidic leachate preferably contains 20 to 200 g / L of chloride ions and bromide ions, and preferably contains 0.01 to 30 g / L of copper and iron, respectively.
（金吸着工程）
次いで、酸性浸出液中の金を、上記の如く再生させた活性炭に接触させて吸着させる。金の活性炭への接触は、バッチ回分式又は、活性炭を充填した吸着塔に酸性浸出液を連続通水する連続式により行うことができる。ここで用いる活性炭は、先に述べた再生方法によりその活性度が大きく高くなっていることから、金を有効に吸着させることができる。
この金吸着工程では、金とともに酸性浸出液中に浸出していた銅や鉄その他の金属、硫黄等もまた、活性炭に付着する。
(Gold adsorption process)
Next, the gold in the acid leaching solution is adsorbed by contacting the activated carbon regenerated as described above. The contact of gold with activated carbon can be performed by a batch batch system or a continuous system in which an acidic leachate is continuously passed through an adsorption tower packed with activated carbon. The activated carbon used here has a high level of activity due to the regeneration method described above, and therefore can effectively adsorb gold.
In this gold adsorption step, copper, iron and other metals, sulfur, etc. that have been leached with the gold in the acidic leachate also adhere to the activated carbon.
（金溶離工程）
その後、金が吸着した活性炭を、苛性ソーダ等にシアンイオンを添加したシアン溶液又は、チオ硫酸塩を添加した溶液その他の溶液に接触させて、活性炭に吸着した金を溶離させる。それにより、金を溶離させた使用後の活性炭はアルカリ性となることがある。なお、金の回収率の観点からは、シアン溶液を用いることが好ましい。
これにより得られる濃厚金溶液は、たとえば金を５０〜５０００ｍｇ程度で含み、この濃厚金溶液から、シュウ酸ナトリウムによる還元、二酸化硫黄による化学的還元法又は、溶媒抽出−電解採取法その他の公知の方法にて、単体の金を得ることができる。
(Gold elution process)
Thereafter, the activated carbon on which gold is adsorbed is brought into contact with a cyan solution in which cyan ion is added to caustic soda or the like or a solution in which thiosulfate is added to elute the gold adsorbed on the activated carbon. Thereby, activated carbon after use in which gold is eluted may become alkaline. From the viewpoint of gold recovery rate, it is preferable to use a cyan solution.
The concentrated gold solution thus obtained contains, for example, about 50 to 5000 mg of gold. From this concentrated gold solution, a reduction with sodium oxalate, a chemical reduction method with sulfur dioxide, or a solvent extraction-electrolytic extraction method or other known methods. In this way, a single piece of gold can be obtained.
上記の金溶離工程で金を溶離させた使用後の活性炭に対しては再度、この発明の再生方法を実施することができ、それにより、活性炭を有効に繰り返し用いることができる。その結果、新しい活性炭を用いることに必要なコストを抑えることができる。 The activated carbon after use in which gold has been eluted in the gold elution step can be re-executed, whereby the activated carbon can be effectively and repeatedly used. As a result, the cost required to use new activated carbon can be suppressed.
次に、この発明の活性炭の再生方法を試験的に実施し、その効果を検証したので以下に説明する。但し、ここでの具体的な説明は単なる例示を意図したものであって、これに限定されるものではない。 Next, the method for regenerating activated carbon according to the present invention was experimentally carried out, and the effects thereof were verified. However, the specific description here is intended only as an example, and is not limited thereto.
（試験例１）
参考例３及び４並びに実施例３及び４では、使用後の活性炭に対し、表１に示す各条件の下で洗浄を行い、使用後の活性炭を再生させた。
参考例１では、まだ使用されていない未使用の活性炭を対象とし、また参考例２では、使用後の活性炭を対象としたものであり、いずれも再生処理を施さなかった。
比較例１では、使用後の活性炭に賦活処理を施し、洗浄は行わなかった。比較例２では、使用後の活性炭を洗浄したが、洗浄後の洗浄液のｐＨが７．６となった。
(Test Example 1)
In Reference Examples 3 and 4 and Examples 3 and 4 , the activated carbon after use was washed under the conditions shown in Table 1 to regenerate the activated carbon after use.
In Reference Example 1, unused activated carbon that has not been used yet was targeted, and in Reference Example 2, activated carbon after use was targeted, and none of them was subjected to regeneration treatment.
In Comparative Example 1, the activated carbon after use was subjected to activation treatment and was not washed. In Comparative Example 2, the activated carbon after use was washed, but the pH of the washing solution after washing was 7.6.
これらの各実施例３及び４、参考例１〜４並びに比較例１及び２で得られた活性炭に対し、下記の試験を実施した。
The following tests were carried out on the activated carbons obtained in Examples 3 and 4 , Reference Examples 1 to 4 and Comparative Examples 1 and 2.
上記の活性炭のそれぞれを、表２に示す条件の下で評価液に浸漬し、その評価液に含まれる金の濃度を測定する試験を行った。ここで、金の濃度は、ＩＣＰ発光分光分析法（ＩＣＰ−ＯＥＳ）により測定した。なお表２中の浸出液とは、先に述べたような金の回収方法に従って特定の金鉱石を浸出した液であり、Ｃｕ、Ｆｅ等の不純物を含むものである。
そして、それにより得られた測定値から、先述のＦｌｅｍｉｎｇの式（１）を用いて活性度を算出し、それらの各活性炭の活性度を、参考例１の活性炭を１００％とする比率で評価した。その結果を表３に示す。
Each of the activated carbons was immersed in an evaluation solution under the conditions shown in Table 2, and a test was performed to measure the concentration of gold contained in the evaluation solution. Here, the gold concentration was measured by ICP emission spectroscopy (ICP-OES). The leaching solution in Table 2 is a solution obtained by leaching specific gold ore according to the gold recovery method as described above, and contains impurities such as Cu and Fe.
Then, the activity is calculated from the measured value obtained by using the above-mentioned Fleming equation (1), and the activity of each activated carbon is evaluated at a ratio where the activated carbon of Reference Example 1 is 100%. did. The results are shown in Table 3.
表３に示す結果から、賦活処理のみを施した比較例１の活性炭は、活性度が６２％であるのに対し、洗浄処理を施した参考例３及び４並びに実施例３及び４の活性炭はいずれも活性度が８０％を大きく上回っていることが解かる。酸性洗浄液による洗浄処理を施し、洗浄後の洗浄液のｐＨが７．６となった比較例２の活性炭は、活性度が６８．１％と比較的低い値となった。
なお、実施例３よりも苛性ソーダのモル濃度が０．５ｍｏｌ／Ｌと高かった実施例４では、活性度が実施例３ほど大きくは向上しなかった。
From the results shown in Table 3, the activated carbon of Comparative Example 1 subjected only to the activation treatment has an activity of 62%, whereas the activated carbons of Reference Examples 3 and 4 and Examples 3 and 4 subjected to the washing treatment are It can be seen that the activity is much higher than 80%. The activated carbon of Comparative Example 2 that had been subjected to a cleaning treatment with an acidic cleaning solution and the pH of the cleaning solution after cleaning was 7.6 had a relatively low activity of 68.1%.
In Example 4 molar sodium hydroxide than the actual施例3 was as high as 0.5 mol / L, greater activity is higher in Example 3 was not improved.
（試験例２）
使用後の活性炭を水で洗浄し、洗浄前と洗浄後のそれぞれの活性炭表面の元素品位を、ＥＰＭＡ（Ｅｌｅｃｔｒｏｎ Ｐｒｏｂｅ ＭｉｃｒｏＡｎａｌｙｓｅｒ）により測定した。その結果を表４に示す。
(Test Example 2)
The activated carbon after use was washed with water, and the elemental quality of each activated carbon surface before and after washing was measured by EPMA (Electron Probe MicroAnalyzer). The results are shown in Table 4.
表４に示す結果より、洗浄後の活性炭表面では、洗浄前のものと比較して、Ｎａ元素が大きく低下していることが解かる。
従って、使用後の活性炭の表面を覆っていたナトリウムが、洗浄により除去され、その結果として、洗浄後の活性炭の活性度が大きく向上したと考えられる。
From the results shown in Table 4, it can be seen that the Na element is greatly reduced on the activated carbon surface after washing, as compared with that before washing.
Therefore, it was considered that sodium that had covered the surface of the activated carbon after use was removed by washing, and as a result, the activity of the activated carbon after washing was greatly improved.
（試験例３）
アルカリ性洗浄液、中性洗浄液及び酸性洗浄液のそれぞれで使用後の活性炭を洗浄した際の、各洗浄液のｐＨの推移を測定した。その結果を図２に示す。ここでは、アルカリ性洗浄液として０．１ｍｏｌ／Ｌ及び０．５ｍｏｌ／Ｌの苛性ソーダ水溶液、中性洗浄液として工業用水、酸性浄液として０．１ｍｏｌ／Ｌの塩酸溶液を用いた。また、使用後の活性炭としてはアルカリシアン液を用いて金を溶離した後の活性炭を使用した。
(Test Example 3)
The transition of the pH of each cleaning solution was measured when the activated carbon after use was washed with each of an alkaline cleaning solution, a neutral cleaning solution and an acidic cleaning solution. The result is shown in FIG. Here, 0.1 mol / L and 0.5 mol / L aqueous caustic soda were used as the alkaline cleaning liquid, industrial water was used as the neutral cleaning liquid, and 0.1 mol / L hydrochloric acid solution was used as the acidic cleaning liquid. Further, as the activated carbon after use, activated carbon after elution of gold using an alkali cyan liquid was used.
各溶液中に使用後の活性炭を投入すると、洗浄時間の経過に伴って、図２に示すように、その活性炭に付着しているアルカリ性物質（苛性ソーダ）により、いずれの溶液でもｐＨが上昇していることが解かる。
ここで、いずれの苛性ソーダ水溶液及び工業用水も、洗浄の前後にわたってアルカリ性領域ないし中性領域に維持されているのに対し、塩酸溶液では、酸性領域から、洗浄時間が１時間を経過した段階でｐＨが７を超えて略中性領域に変化している。
When activated carbon after use is put into each solution, as the cleaning time elapses, as shown in FIG. 2, the alkaline substance (caustic soda) adhering to the activated carbon increases the pH in any solution. You can see that
Here, all the caustic soda aqueous solution and industrial water are maintained in the alkaline region or neutral region before and after the washing, whereas in the hydrochloric acid solution, the pH is reached after the washing time of 1 hour has passed from the acidic region. Has exceeded 7 and has changed to a substantially neutral region.
この結果から、塩酸溶液では、その後、ｐＨが上昇して中性領域付近になったことに起因して、一旦溶解した銅や鉄等が析出し、活性炭の表面を再度覆ったと推察することができる。そのため、このような塩酸溶液による洗浄では、使用後の活性炭の活性度を高めることができないと考えられる。 From this result, it can be inferred that in the hydrochloric acid solution, the dissolved copper, iron, etc. once deposited and covered the surface of the activated carbon again due to the pH rising to the vicinity of the neutral region. it can. For this reason, it is considered that the activity of activated carbon after use cannot be increased by washing with such a hydrochloric acid solution.
以上に述べた各試験結果より、この発明の活性炭の再生方法によれば、再生される活性炭の活性度を大きく高めて、これを有効に再利用できることが解かった。 From the test results described above, it was found that according to the method for regenerating activated carbon of the present invention, the activity of the activated carbon to be regenerated can be greatly increased, and this can be effectively reused.
Claims (6)
金が吸着した活性炭から、シアン溶液を用いて当該金を溶離させた後の、使用後の活性炭を対象とし、
前記使用後の活性炭をアルカリ性洗浄液である苛性ソーダ水溶液で洗浄し、その洗浄後のアルカリ性洗浄液をアルカリ性領域とする、活性炭の再生方法。 After the gold is adsorbed from the activated carbon on which gold is adsorbed, the activated carbon after use after eluting the gold is regenerated to recycle the activated carbon for gold adsorption,
For activated carbon after use after eluting the gold with cyanide solution from activated carbon on which gold is adsorbed,
The activated carbon after use were washed with sodium hydroxide aqueous solution is alkaline washing solution, the alkaline cleaning liquid after the cleaning and alkaline area, the method of reproducing the activated carbon.
前記金を含む液が、アニオンとして塩化物イオン及び／又は臭化物イオンを含むとともにカチオンとして銅及び鉄を含む酸性浸出液に、含金硫化金属鉱に含まれる金を加温浸出させて得られた液である、請求項１〜４のいずれか一項に記載の活性炭の再生方法。 The target is activated carbon after use after adsorbing gold in a liquid containing gold to activated carbon, and then eluting the gold from the activated carbon on which gold is adsorbed.
The liquid containing gold is obtained by warming and leaching gold contained in a metal-containing metal sulfide ore into an acidic leachate containing chloride ions and / or bromide ions as anions and copper and iron as cations. The regeneration method of activated carbon as described in any one of Claims 1-4 which is.
前記活性炭として、請求項１〜５のいずれか一項に記載の活性炭の再生方法により再生させた活性炭を用いる、金の回収方法。 A gold leaching step in which gold contained in the metal-containing metal sulfide is heated and leached into an acidic leaching solution containing chloride ions and / or bromide ions as anions and copper and iron as cations, and leaching into the acidic leaching solution A gold recovery method comprising a gold adsorption step for adsorbing the gold adsorbed on the activated carbon and a gold elution step for eluting the gold adsorbed on the activated carbon,
As the activated carbon, used activated carbon was regenerated by the method of regeneration of activated carbon according to any one of claims 1 to 5 the method of recovering gold.
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| PCT/JP2016/057483 WO2016143837A1 (en) | 2015-03-06 | 2016-03-03 | Activated carbon regeneration method and gold recovery method |
| AU2016230060A AU2016230060B2 (en) | 2015-03-06 | 2016-03-03 | Activated carbon regeneration method and gold recovery method |
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