JPH1112663A - Method for purifying gold - Google Patents
Method for purifying goldInfo
- Publication number
- JPH1112663A JPH1112663A JP16854397A JP16854397A JPH1112663A JP H1112663 A JPH1112663 A JP H1112663A JP 16854397 A JP16854397 A JP 16854397A JP 16854397 A JP16854397 A JP 16854397A JP H1112663 A JPH1112663 A JP H1112663A
- Authority
- JP
- Japan
- Prior art keywords
- gold
- iodide
- org
- solvent
- organic solvent
- 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
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000010931 gold Substances 0.000 title claims abstract description 68
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims description 19
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 17
- 239000011630 iodine Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 8
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000003960 organic solvent Substances 0.000 claims description 28
- 229910001516 alkali metal iodide Inorganic materials 0.000 claims description 4
- 229910001619 alkaline earth metal iodide Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims 1
- 150000002826 nitrites Chemical class 0.000 claims 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 abstract description 12
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000002904 solvent Substances 0.000 abstract description 7
- 238000010908 decantation Methods 0.000 abstract description 6
- 239000006228 supernatant Substances 0.000 abstract description 6
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Chemical compound [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 abstract description 4
- 150000001298 alcohols Chemical class 0.000 abstract description 3
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 3
- 150000004694 iodide salts Chemical class 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 150000002825 nitriles Chemical class 0.000 abstract description 3
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 abstract description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 2
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 2
- 229910001640 calcium iodide Inorganic materials 0.000 abstract description 2
- 229940046413 calcium iodide Drugs 0.000 abstract description 2
- 238000004821 distillation Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000001376 precipitating effect Effects 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract 2
- 241000416536 Euproctis pseudoconspersa Species 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 9
- 239000000126 substance Substances 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 235000009518 sodium iodide Nutrition 0.000 description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- SGUXGJPBTNFBAD-UHFFFAOYSA-L barium iodide Chemical compound [I-].[I-].[Ba+2] SGUXGJPBTNFBAD-UHFFFAOYSA-L 0.000 description 1
- 229910001638 barium iodide Inorganic materials 0.000 description 1
- 229940075444 barium iodide Drugs 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- -1 methanol and ethanol Chemical class 0.000 description 1
- MCSAJNNLRCFZED-UHFFFAOYSA-N nitroethane Chemical compound CC[N+]([O-])=O MCSAJNNLRCFZED-UHFFFAOYSA-N 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- UQFSVBXCNGCBBW-UHFFFAOYSA-M tetraethylammonium iodide Chemical compound [I-].CC[N+](CC)(CC)CC UQFSVBXCNGCBBW-UHFFFAOYSA-M 0.000 description 1
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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金の精製方法の改良
に関し、さらに詳しくは、低品位の金から、簡単な操作
により短時間で効率よく高品位の金を得る金の精製方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for refining gold, and more particularly, to a method for refining gold from low-grade gold to obtain high-grade gold efficiently and in a short time by a simple operation. is there.
【０００２】[0002]
【従来の技術】金は装飾品や電子部品などに多く使用さ
れているが、高価な材料であるため、これらの加工や製
造に際して生じる加工屑や廃棄物から金を再利用可能な
状態で回収することが産業上極めて重要な問題になって
いる。2. Description of the Related Art Gold is often used for decorative articles and electronic components, but is an expensive material, so gold can be recovered in a recyclable state from processing waste and waste generated during processing and manufacturing. Is a very important industrial issue.
【０００３】これまで、このような金の回収には、王水
又は空気を吹き込んだシアン化物水溶液にいったん溶解
させたのち、これを還元して析出する方法がとられてい
るが、王水やシアン化物は有害物であり、取り扱いを慎
重にしないと作業者の衛生を害するおそれがあり、工業
的に実施するには不適当であった。Heretofore, to recover such gold, a method of once dissolving it in aqua regia or an aqueous cyanide solution into which air has been blown, and then reducing and precipitating the solution has been adopted. Cyanide is a harmful substance, and if not handled carefully, it may impair the hygiene of workers and is unsuitable for industrial practice.
【０００４】最近、このような有害物の代りに、ハロゲ
ン単体やハロゲン化物を含有する有機溶剤に金を溶解さ
せたのち、水素化ホウ素ナトリウムなどにより還元して
金を再析出させる方法が提案されている（特開平４−６
２２９号公報、特開平４−２１７２６号公報）。Recently, instead of such harmful substances, a method has been proposed in which gold is dissolved in an organic solvent containing a halogen alone or a halide, and then reduced with sodium borohydride or the like to precipitate gold again. (Japanese Patent Laid-Open No. 4-6)
229, JP-A-4-21726).
【０００５】しかしながら、この方法も、溶解した液か
ら金を回収するには還元工程を必要とするため、煩雑な
操作を行わなければならない上、還元に際して多量の副
生物を伴うために、より純度が向上した金を得るには、
さらに精製しなければならないという欠点がある。さら
に、少なくとも一方のハロゲンがヨウ素であるハロゲン
化物とハロゲン単体を含有する有機溶剤に金を溶解し、
次いで冷却してより高品位の金を得る方法が提案されて
いる（特開平７−３３５１号公報）。しかしながら、こ
の方法においては、一回の操作で得られる金が、使用す
るハロゲンの１５モル％程度と低い上、冷却して金を析
出させるのに長時間を要するという欠点がある。[0005] However, this method also requires a reduction step in order to recover gold from the dissolved liquid, which requires a complicated operation, and involves a large amount of by-products in the reduction. To get improved gold,
It has the disadvantage of having to be further purified. Further, at least one halogen is dissolved in an organic solvent containing a halide containing iodine and a simple halogen,
Then, a method of obtaining higher quality gold by cooling is proposed (JP-A-7-3351). However, this method has the drawbacks that the gold obtained by one operation is as low as about 15 mol% of the halogen used, and that it takes a long time to precipitate gold by cooling.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、このような
従来の金の精製方法における欠点を克服し、有害物を用
いることなく、しかも簡単な操作により、短時間で、か
つ効率よく高品位の金を得ることができる方法を提供す
ることを目的としてなされたものである。SUMMARY OF THE INVENTION The present invention overcomes the drawbacks of the conventional method for refining gold, and uses a simple operation without using harmful substances, in a short time and efficiently. The purpose of the present invention is to provide a method for obtaining gold.
【０００７】[0007]
【課題を解決するための手段】本発明者は、工業的に実
施するのに適した金の精製方法を開発するために鋭意研
究を重ねた結果、特定のヨウ化物とヨウ素単体とを含有
する有機溶剤溶液を用いて、精製すべき金を処理するこ
とにより、その目的を達成しうることを見出し、この知
見に基づいて本発明を完成するに至った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to develop a method for refining gold suitable for industrial implementation, and as a result, the present invention contains a specific iodide and iodine alone. It has been found that the object can be achieved by treating gold to be purified with an organic solvent solution, and based on this finding, the present invention has been completed.
【０００８】すなわち、本発明は、揮発性有機溶剤にア
ルカリ金属又はアルカリ土類金属のヨウ化物及びヨウ素
単体を溶解したのち、この溶液に不純物を含む金を加熱
溶解させ、次いで該有機溶剤を留去して金を析出させ、
この金を分離後、前記有機溶剤で洗浄処理することを特
徴とする金の精製方法を提供するものである。That is, according to the present invention, an alkali metal or alkaline earth metal iodide and iodine alone are dissolved in a volatile organic solvent, gold containing impurities is dissolved in the solution by heating, and then the organic solvent is distilled off. Leaving to deposit gold,
An object of the present invention is to provide a method for purifying gold, wherein the gold is separated and washed with the organic solvent.
【０００９】[0009]
【発明の実施の形態】本発明方法においては、アルカリ
金属又はアルカリ土類金属のヨウ化物及びヨウ素単体を
含有する有機溶剤溶液が用いられる。上記ヨウ化物及び
ヨウ素単体のいずれか一方が含まれない場合には、金が
十分に溶解せず、本発明の目的が達せられない。前記ヨ
ウ化物としては、アルカリ金属やアルカリ土類金属のヨ
ウ化物が用いられる。アルカリ金属のヨウ化物として
は、例えばヨウ化リチウム、ヨウ化ナトリウム、ヨウ化
カリウムなどが挙げられ、またアルカリ土類金属のヨウ
化物としては、例えばヨウ化カルシウム、ヨウ化バリウ
ムなどが挙げられる。ヨウ化テトラエチルアンモニウム
のようなヨウ素含有第四級アンモニウム塩を使用した場
合は、金は溶解するものの、溶剤を留去した際に、金が
析出しにくいので、本発明方法には適さない。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, an organic solvent solution containing iodide of an alkali metal or alkaline earth metal and simple iodine is used. If one of the above-mentioned iodide and iodine alone is not contained, gold is not sufficiently dissolved, and the object of the present invention cannot be achieved. As the iodide, an alkali metal or alkaline earth metal iodide is used. Examples of the alkali metal iodide include lithium iodide, sodium iodide and potassium iodide, and examples of the alkaline earth metal iodide include calcium iodide and barium iodide. When an iodine-containing quaternary ammonium salt such as tetraethylammonium iodide is used, gold is dissolved, but when the solvent is distilled off, it is difficult to deposit gold, which is not suitable for the method of the present invention.
【００１０】本発明においては、前記ヨウ化物は単独で
用いてもよいし、２種以上を組み合わせて用いてもよ
い。また、このヨウ化物とヨウ素単体との使用割合につ
いては特に制限はないが、一般にヨウ素単体の価格が高
いことから、精製の効果及び経済性などを考慮すると、
ヨウ素単体は、ヨウ化物中のヨウ素に対し、０．３〜
０．７倍モル程度用いるのが有利である。In the present invention, the iodides may be used alone or in combination of two or more. In addition, there is no particular limitation on the use ratio of this iodide and iodine alone, but since the price of iodine alone is generally high, considering the effect of purification and economics,
Iodine alone is 0.3 to 0.3% of iodine in iodide.
It is advantageous to use about 0.7 times mol.
【００１１】次に、有機溶剤としては、揮発性であっ
て、使用するヨウ化物及びヨウ素単体の両方を溶解する
ものであればよく、特に制限はないが、例えばアセトニ
トリルやプロピオニトリルなどのニトリル類、メタノー
ルやエタノールなどの低級アルコール類、ニトロメタ
ン、ニトロエタンのようなニトロ化アルカン類、酢酸エ
チル、酢酸メチルのようなエステル類が用いられるが、
金の溶解率が高く留去が容易という点でニトリル類や低
級アルコール類が好ましい。これらの有機溶剤は単独で
用いてもよいし、２種以上を混合して用いてもよい。The organic solvent is not particularly limited as long as it is volatile and can dissolve both iodide and iodine alone. Examples of the organic solvent include nitrile such as acetonitrile and propionitrile. , Lower alcohols such as methanol and ethanol, nitrated alkanes such as nitromethane and nitroethane, and esters such as ethyl acetate and methyl acetate.
Nitriles and lower alcohols are preferred from the viewpoint that the solubility of gold is high and the distillation is easy. These organic solvents may be used alone or as a mixture of two or more.
【００１２】本発明においては、前記ヨウ化物及びヨウ
素単体は、有機溶剤溶液中のそれらの合計濃度が、通常
１ミリモル／リットルないし飽和濃度の範囲、好ましく
は５〜５００ミリモル／リットルの範囲になるように含
有させるのがよい。In the present invention, the total concentration of the iodide and the simple substance of iodine in the organic solvent solution is usually in the range of 1 mmol / liter to saturated concentration, preferably in the range of 5 to 500 mmol / liter. It is better to contain it.
【００１３】本発明方法を好適に実施するには、まず、
ヨウ化物及びヨウ素単体を、それぞれ所定濃度で含有す
る有機溶剤溶液中に、不純物を含む金を溶解させる。こ
の際、効率よく多量の金を溶解させるために、使用する
有機溶剤の還流温度まで加熱して溶解させるのが有利で
ある。In order to carry out the method of the present invention suitably, first,
Gold containing impurities is dissolved in an organic solvent solution containing iodide and iodine alone at predetermined concentrations. At this time, in order to efficiently dissolve a large amount of gold, it is advantageous to dissolve by heating to the reflux temperature of the organic solvent used.
【００１４】次いで、有機溶剤を留去し、金を析出させ
たのち、この析出した金を含む残渣を有機溶剤、好まし
くは留去した有機溶剤を用いて十分に洗浄後、デカンテ
ーション、ろ過、遠心分離などの手段を用いて固液分離
し、得られた固形物を乾燥処理することにより、高品位
の金が得られる。この際、留去し、回収した有機溶剤を
残渣の洗浄に用い、デカンテーションにより析出した金
を分離すれば、その上澄液を再度金の溶解に使用するこ
とができる。すなわち、有機溶剤の留去、残渣の有機溶
剤による洗浄、デカンテーションによる金の回収を行っ
たのち、その上澄液に精製すべき金を溶解させたのち、
上記操作を繰り返すことにより、有機溶剤を廃棄物とす
ることなく、連続的に高品位の金を得ることができる。Next, after the organic solvent is distilled off and gold is deposited, the residue containing the deposited gold is sufficiently washed with an organic solvent, preferably the distilled off organic solvent, and then decantation, filtration, and the like are performed. By performing solid-liquid separation using a means such as centrifugation and drying the obtained solid, high-grade gold can be obtained. At this time, if the organic solvent which has been distilled off and collected is used for washing the residue and the gold deposited by decantation is separated, the supernatant can be used again for dissolving the gold. That is, after distilling off the organic solvent, washing the residue with the organic solvent, and collecting the gold by decantation, after dissolving the gold to be purified in the supernatant,
By repeating the above operation, high-grade gold can be obtained continuously without turning the organic solvent into waste.
【００１５】[0015]
【発明の効果】本発明方法によれば、有害な薬品を使用
することなく、入手が容易なヨウ化物及びヨウ素単体を
含む有機溶剤溶液を用い、単に金の溶解、有機溶剤の留
去及び残渣の有機溶剤による洗浄の操作を行うだけで、
低品位の金を高品位の金に精製することができるので、
加工屑や廃棄物中からの金の回収や、低品位金合金から
の高品位金の回収のための工業的方法として好適であ
る。また、使用する有機溶剤を、回収再使用するシステ
ムとすれば、廃棄物として排出させることなく連続的な
操業を行うことができる。According to the method of the present invention, an organic solvent solution containing iodide and iodine, which is easily available, is used without using harmful chemicals. Just perform the cleaning operation with an organic solvent
Since low-grade gold can be refined to high-grade gold,
It is suitable as an industrial method for recovering gold from processing waste and waste and recovering high-grade gold from low-grade gold alloys. In addition, if the organic solvent used is collected and reused, continuous operation can be performed without discharging the waste as waste.
【００１６】[0016]
【実施例】次に、本発明を実施例によりさらに詳細に説
明するが、本発明は、これらの例によってなんら限定さ
れるものではない。EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００１７】実施例１ アセトニトリル２ｇに、ヨウ化ナトリウム１ミリモル及
びヨウ素単体０．５ミリモルを溶解し、次いでこの溶液
に、０．２ｍｍ径の金線２３５ｍｇを浸し、かきまぜな
がら６時間加熱還流させ、金を飽和濃度まで溶解させ
た。次に、加熱したまま、溶解しなかった金線を取り出
し、メタノールで洗浄したのち、乾燥後、秤量して還流
加熱下で溶解した金の重量を求めたところ、１６８．８
ｍｇであった。これにより、金６６．２ｍｇが溶液中に
溶解したことが分る。次に、溶液中からアセトニトリル
を留去し、金を含む残渣に、留去したアセトニトリル２
ｇを加えて洗浄処理した。次いで、上澄液を除いたの
ち、残った金をメタノールで洗浄後、乾燥することによ
り、粉末状の金１１５．３ｍｇを得た。Example 1 1 mmol of sodium iodide and 0.5 mmol of iodine alone were dissolved in 2 g of acetonitrile, and 235 mg of a 0.2 mm diameter gold wire was immersed in this solution, and the mixture was heated and refluxed for 6 hours while stirring. Gold was dissolved to saturation. Next, while heating, the undissolved gold wire was taken out, washed with methanol, dried, weighed, and the weight of the gold dissolved under reflux heating was determined to be 168.8.
mg. This indicates that 66.2 mg of gold has dissolved in the solution. Next, acetonitrile was distilled off from the solution, and a residue containing gold was added to the distilled acetonitrile 2
g was added for washing. Next, after removing the supernatant, the remaining gold was washed with methanol and dried to obtain 115.3 mg of powdered gold.
【００１８】実施例２〜５ アセトニトリル２ｇの代わりに、メタノール１０ｇを、
ヨウ化ナトリウム１ミリモルの代わりに、表１に示す種
類と量のヨウ化物を用い、かつ表１に示す時間還流させ
た以外は、実施例１と同様にして実施した。結果を表１
に示す。Examples 2 to 5 Instead of 2 g of acetonitrile, 10 g of methanol was used.
The procedure was carried out in the same manner as in Example 1 except that the type and amount of iodide shown in Table 1 were used instead of 1 mmol of sodium iodide, and the mixture was refluxed for the time shown in Table 1. Table 1 shows the results
Shown in
【００１９】[0019]
【表１】 [Table 1]
【００２０】実施例６ 実施例１において、アセトニトリルを留去して得た金を
含む残渣に、アセトニトリル２ｇを加えて洗浄処理した
のち、デカンテーションによりアセトニトリルを除き、
金を分離した。上澄液に、０．２ｍｍ径の金線２３５ｍ
ｇを加えて、６時間加熱還流させ、金１１５．１ｍｇを
さらに溶解させた溶液を調製した。次いで、溶液中のア
セトニトリルを留去し、金を含む残渣に留去したアセト
ニトリル２ｇを加えて洗浄処理後、デカンテーションに
より上澄液を除いたのち、金をメタノールで洗浄し、乾
燥して粉末状の金１１２．６ｍｇを得た。Example 6 In Example 1, 2 g of acetonitrile was added to a gold-containing residue obtained by distilling off acetonitrile, and the residue was washed. Then, acetonitrile was removed by decantation.
Gold separated. 235m of 0.2mm diameter gold wire in the supernatant
g was added and the mixture was heated under reflux for 6 hours to prepare a solution in which 115.1 mg of gold was further dissolved. Then, acetonitrile in the solution was distilled off, and 2 g of the distilled acetonitrile was added to the residue containing gold. After washing, the supernatant was removed by decantation. The gold was washed with methanol, dried, and dried. 112.6 mg of gold were obtained.
Claims (3)
カリ土類金属のヨウ化物及びヨウ素単体を溶解したの
ち、この溶液に不純物を含む金を加熱溶解させ、次いで
有機溶剤を留去して金を析出させ、この金を分離後、前
記有機溶剤で洗浄することを特徴とする金の精製方法。1. An alkali metal or alkaline earth metal iodide and iodine alone are dissolved in a volatile organic solvent, and then gold containing impurities is dissolved in the solution by heating, and then the organic solvent is distilled off to remove the gold. A method for purifying gold, comprising depositing, separating the gold, and washing with the organic solvent.
少なくとも１種である請求項１記載の金の精製方法。2. The method for purifying gold according to claim 1, wherein the organic solvent is at least one selected from nitrites.
から留去した有機溶剤を用いる請求項１又は２記載の金
の精製方法。3. The method for purifying gold according to claim 1, wherein an organic solvent distilled from a solution in which the gold is dissolved is used for washing the deposited gold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16854397A JP3002723B2 (en) | 1997-06-25 | 1997-06-25 | Gold refining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16854397A JP3002723B2 (en) | 1997-06-25 | 1997-06-25 | Gold refining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1112663A true JPH1112663A (en) | 1999-01-19 |
| JP3002723B2 JP3002723B2 (en) | 2000-01-24 |
Family
ID=15869972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16854397A Expired - Lifetime JP3002723B2 (en) | 1997-06-25 | 1997-06-25 | Gold refining method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3002723B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023153291A1 (en) * | 2022-02-10 | 2023-08-17 | 株式会社ガルデリア | Noble metal recovery agent and noble metal recovery method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102412645B1 (en) * | 2020-09-21 | 2022-06-28 | 선도화학 주식회사 | Manufacturing device for dry ice product and Manufacturing method for dry ice product using therefore |
| KR102412644B1 (en) * | 2020-09-21 | 2022-06-28 | 선도화학 주식회사 | Manufacturing device for dry ice product |
-
1997
- 1997-06-25 JP JP16854397A patent/JP3002723B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023153291A1 (en) * | 2022-02-10 | 2023-08-17 | 株式会社ガルデリア | Noble metal recovery agent and noble metal recovery method |
| JP2023117124A (en) * | 2022-02-10 | 2023-08-23 | 株式会社ガルデリア | Noble metal recovery agent, and method for recovering noble metal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3002723B2 (en) | 2000-01-24 |
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