JP3202375B2 - Method for producing potassium dicyanoaurate - Google Patents
Method for producing potassium dicyanoaurateInfo
- Publication number
- JP3202375B2 JP3202375B2 JP34682792A JP34682792A JP3202375B2 JP 3202375 B2 JP3202375 B2 JP 3202375B2 JP 34682792 A JP34682792 A JP 34682792A JP 34682792 A JP34682792 A JP 34682792A JP 3202375 B2 JP3202375 B2 JP 3202375B2
- Authority
- JP
- Japan
- Prior art keywords
- anode
- gold
- current
- surface area
- plate
- 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.)
- Expired - Lifetime
Links
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims description 7
- 229910052700 potassium Inorganic materials 0.000 title claims description 7
- 239000011591 potassium Substances 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 16
- 239000010931 gold Substances 0.000 claims description 16
- 229910052737 gold Inorganic materials 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種金メッキや金合金
メッキの金供給用の薬剤として用いるジシアノ金酸カリ
ウムの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing potassium dicyanoaurate used as a chemical for supplying gold for various gold platings and gold alloy platings.
【０００２】[0002]
【従来の技術】ジシアノ金酸カリウムは、従来より電解
法によって製造されている。この方法は、金地金を板状
の陽極とし、イオン交換樹脂やセラミック等による隔膜
を介して不溶性金属を陰極として対向させ、シアン化カ
リウム溶液中で電解することにより製造するものであ
る。2. Description of the Related Art Potassium dicyanoaurate is conventionally produced by an electrolytic method. In this method, gold is used as a plate-like anode, and an insoluble metal is opposed as a cathode via a diaphragm made of an ion exchange resin or ceramics, and electrolysis is performed in a potassium cyanide solution.
【０００３】この方法によると、通電する電流は、陽極
板の表面積に対する電流の大きさ、つまり電流密度をも
とに決定されるもので、この電流密度を維持することに
より金の陽極溶解反応が進行し、保持されるものであ
る。そこで、電解が進み、陽極板の表面積が減少して陽
極表面が不働態化されると、電流値が下がり、酸素ガス
の発生が始まることになる。According to this method, the current to be supplied is determined on the basis of the magnitude of the current with respect to the surface area of the anode plate, that is, the current density. It is something that progresses and is retained. Then, when the electrolysis proceeds and the surface area of the anode plate decreases and the anode surface is passivated, the current value decreases and the generation of oxygen gas starts.
【０００４】そこで、この陽極溶解反応を確保するため
に一定電流を保持しようと電圧をあげると、電流値もあ
がるが、通電した電流は酸素の発生反応に消費されてし
まう。その結果、板状の陽極を使用した場合は、その電
極の全量を溶解することができず、およそ60〜65% の溶
解率となっているのが現状である。If the voltage is increased to maintain a constant current in order to secure the anodic dissolution reaction, the current value increases, but the supplied current is consumed in the oxygen generation reaction. As a result, when a plate-like anode is used, the entire amount of the electrode cannot be dissolved, and at present, the dissolution rate is about 60 to 65%.
【０００５】[0005]
【発明が解決しようとする課題】そこで、シアン化カリ
ウムを電解液とし、金板を陽極としたときの電流・電圧
曲線は実験の結果を図１に示すと、電圧を徐々に増すと
電流も増し、ａ点に達するまで増加して金はシアン化カ
リウムに溶解する。さらに電圧を増すと電流が下がって
ｂ点に達し、その後は電圧を上げると電流も増すが酸素
の発生が激しくなるものの金は溶解しないことになる。The current-voltage curve when potassium cyanide is used as the electrolyte and the metal plate is used as the anode is shown in FIG. 1. The experimental results are shown in FIG. 1. As the voltage is gradually increased, the current also increases. Gold increases and dissolves in potassium cyanide until point a is reached. When the voltage is further increased, the current decreases and reaches point b. After that, when the voltage is increased, the current also increases, but the generation of oxygen increases but gold does not dissolve.
【０００６】また、陽極の表面積を変えたときの電流・
電圧曲線は、図２に示す如く、電流値は、同一電位にお
いては、表面積が大きいものほど電流値も大であること
がわかる。そこで、電解法によるジシアノ金酸カリウム
の製造においは、定電流装置を用いて常に一定電流を保
ち、溶解により表面積が小さくなると電圧をあげて電流
値を保つ働きをするようにしてある。そのため、表面積
の小さい電極は、大きい電極に比べて不働態化電位に達
し易くなり、溶解反応が止まり易くなるという問題があ
る。Also, the current when the surface area of the anode is changed
As shown in FIG. 2, the voltage curve shows that the larger the surface area is, the larger the current value is at the same potential. Therefore, in the production of potassium dicyanoaurate by the electrolytic method, a constant current device is always used to maintain a constant current, and when the surface area is reduced by dissolution, the voltage is increased to maintain the current value. Therefore, there is a problem that an electrode having a small surface area is more likely to reach a passivation potential than an electrode having a large surface area, and the dissolution reaction is easily stopped.
【０００７】本発明は、陽極の表面積を大きくとり、溶
解による表面積の減少を原因とする不働態化電位までの
到達時間を長くして溶解効率を向上させることを目的と
する。It is an object of the present invention to increase the surface area of an anode and to increase the time to reach a passivation potential due to a decrease in surface area due to dissolution, thereby improving dissolution efficiency.
【０００８】[0008]
【課題を解決するための手段】そこで、本発明は、粒状
に加工した金地金をチタン製容器に入れ、シアン化カリ
ウム溶液の電解槽中に陽極としてセットし、陰極板を隔
膜を介してセットしたことを特徴とする。なお、上記容
器の形状は皿状、椀状等どのような形状でもよく溶液の
通過性のよい網体や穴あき容器でもよい。In view of the above, the present invention provides a method of placing granular gold metal in a titanium container, setting it as an anode in an electrolytic cell of a potassium cyanide solution, and setting a cathode plate through a diaphragm. It is characterized by. The shape of the container may be any shape such as a dish shape or a bowl shape, and may be a mesh or a perforated container having good solution permeability.
【０００９】また、陰極板としては、金に限らず、チタ
ン、ステンレス等どのような材料でも可能である。この
ようにすることにより、金の投入量を低く抑え、しかも
表面積を大きくすることができ、材料管理にすぐれると
共に溶解効率を向上させることになり、金の溶解率を約
20% あげることができた。The cathode plate is not limited to gold, but may be any material such as titanium or stainless steel. By doing so, the amount of gold input can be kept low, and the surface area can be increased. As a result, the material management is improved and the dissolving efficiency is improved.
20% increase.
【００１０】なお、粒状加工の方法は、溶融した金地金
を水中に投ずることにより処理することができる。[0010] In the graining method, the molten gold can be treated by throwing it into water.
【００１１】[0011]
【実施例】金地金21.5Kgを黒鉛坩堝中で加熱溶解し、溶
湯を水中に少しずつ投入して粒状金を製造する。これ
を、チタンバスケット（150 ×300 ×25mm）４個に均等
に入れてこれを陽極とする。EXAMPLE 21.5 kg of gold bullion is heated and melted in a graphite crucible, and a molten metal is poured little by little into water to produce granular gold. This is evenly placed in four titanium baskets (150 × 300 × 25 mm) and used as an anode.
【００１２】陰極としては、金板（150 ×300 ×1mm ）
２枚を作り、素焼隔膜を介して20%シアン化カリウム溶
液中で、60℃、160Aで18時間電解した。その結果、18.6
Kgが溶解し、溶解率は86.5% であった。この溶液を一般
的な濾過ー濃縮ー冷却ー結晶採取ー乾燥の工程を経てジ
シアノ金酸カリウムの結晶を得た。As the cathode, a metal plate (150 × 300 × 1 mm)
Two sheets were prepared, and electrolyzed at 60 ° C. and 160 A for 18 hours in a 20% potassium cyanide solution through a non-sintering diaphragm. As a result, 18.6
Kg was dissolved, and the dissolution rate was 86.5%. This solution was subjected to general filtration-concentration-cooling-crystal collection-drying steps to obtain potassium dicyanoaurate crystals.
【００１３】つぎに、比較として従来技術によって行っ
た例を以下に説明する。金地金27.8Kgを黒鉛坩堝中で加
熱溶解し、鋳造により150 ×300 ×8mm の極板４枚を製
造し、これを陽極とする。陰極としては、金板（150 ×
300 ×1mm ）２枚を作り、素焼隔膜を介して20%シアン
化カリウム溶液中で、60℃、160Aで18時間電解した。Next, an example performed by the conventional technique will be described below for comparison. 27.8 kg of gold metal is heated and melted in a graphite crucible, and four electrodes of 150 × 300 × 8 mm are manufactured by casting, and this is used as an anode. As a cathode, a metal plate (150 ×
(300 × 1 mm) Two sheets were made, and electrolyzed at 60 ° C. and 160 A for 18 hours in a 20% potassium cyanide solution through a sintered diaphragm.
【００１４】その結果、17.4Kgが溶解し、溶解率は62.3
% であった。この溶液を一般的な濾過ー濃縮ー冷却ー結
晶採取ー乾燥の工程を経てジシアノ金酸カリウムの結晶
を得た。As a result, 17.4 kg was dissolved and the dissolution rate was 62.3%.
% Met. This solution was subjected to general filtration-concentration-cooling-crystal collection-drying steps to obtain potassium dicyanoaurate crystals.
【００１５】[0015]
【発明の効果】以上詳細に説明した本発明によると、粒
状に加工した金地金をチタン製容器に入れ、シアン化カ
リウム溶液の電解槽中に陽極としてセットし、陰極板を
隔膜を介してセットしたことにより、従来の板材の陽極
に比べ、溶解効率が大きく向上する効果を有し、粒状金
を追加補給するだけで連続して作業が可能となり、従来
の金板の取り付け、取り外しの作業が不要となる効果が
ある。According to the present invention described in detail above, the gold bullion processed into granules is placed in a titanium container, set as an anode in an electrolytic cell of a potassium cyanide solution, and the cathode plate is set via a diaphragm. This has the effect of greatly improving the dissolution efficiency compared to the conventional plate material anode, making it possible to work continuously by simply replenishing the granular gold, eliminating the need for the installation and removal work of the conventional metal plate. There is an effect.
【００１６】また、陽極は従来の板材に比べ粒材は製造
工程数が少なくてよいために高価な金地金を経済的に運
用することができる効果を有する。Further, since the number of manufacturing steps for the granular material is smaller than that of the conventional plate material for the anode, it is possible to economically operate expensive gold bullion.
【図１】電解液中に金板を陽極としたときの電流と電圧
の関係を示すグラフである。FIG. 1 is a graph showing the relationship between current and voltage when a metal plate is used as an anode in an electrolytic solution.
【図２】陽極金板の表面積を変えたときの電流と電圧の
関係を示すグラフである。FIG. 2 is a graph showing a relationship between current and voltage when the surface area of the anode metal plate is changed.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C25B 1/00 - 15/08 C01G 7/00 C25D 21/14 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C25B 1/00-15/08 C01G 7/00 C25D 21/14
Claims (1)
入れ、シアン化カリウム溶液の電解槽中に陽極としてセ
ットし、陰極板を隔膜を介してセットしたことを特徴と
するジシアノ金酸カリウムの製造方法。1. A method for producing potassium dicyanoaurate, characterized in that granular gold metal is placed in a titanium container, set as an anode in an electrolytic cell of a potassium cyanide solution, and a cathode plate is set through a diaphragm. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34682792A JP3202375B2 (en) | 1992-12-25 | 1992-12-25 | Method for producing potassium dicyanoaurate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34682792A JP3202375B2 (en) | 1992-12-25 | 1992-12-25 | Method for producing potassium dicyanoaurate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06192866A JPH06192866A (en) | 1994-07-12 |
| JP3202375B2 true JP3202375B2 (en) | 2001-08-27 |
Family
ID=18386078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34682792A Expired - Lifetime JP3202375B2 (en) | 1992-12-25 | 1992-12-25 | Method for producing potassium dicyanoaurate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3202375B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2166660B1 (en) * | 1999-05-06 | 2003-02-16 | Torres Josep Ferre | PROCEDURE AND EQUIPMENT FOR THE ELECTRODEPOSITION OF GOLD OR GOLD ALLOYS. |
| KR101301526B1 (en) * | 2012-02-02 | 2013-09-04 | 성일하이텍(주) | Manufacturing method of potassium silver cyanide solution using air bubbling |
| CN109518210A (en) * | 2018-11-29 | 2019-03-26 | 泰州市欣港电子材料有限公司 | A kind of gold potassium cyanide production technology |
| JP7137649B2 (en) | 2021-01-26 | 2022-09-14 | 松田産業株式会社 | Method for producing potassium gold cyanide |
-
1992
- 1992-12-25 JP JP34682792A patent/JP3202375B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06192866A (en) | 1994-07-12 |
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