JPS6250408B2 - - Google Patents
Info
- Publication number
- JPS6250408B2 JPS6250408B2 JP53066506A JP6650678A JPS6250408B2 JP S6250408 B2 JPS6250408 B2 JP S6250408B2 JP 53066506 A JP53066506 A JP 53066506A JP 6650678 A JP6650678 A JP 6650678A JP S6250408 B2 JPS6250408 B2 JP S6250408B2
- Authority
- JP
- Japan
- Prior art keywords
- gold
- cyanide
- salt
- alkali metal
- solution
- 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
Links
Description
【発明の詳細な説明】
本発明は、シアン化金塩の製造方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a gold cyanide salt.
従来よりシアン化金塩を製造するには、アルカ
リ金属のシアン化金塩（MAu（CN2、MNaまた
はＫ）溶液を冷却させて結晶を析出する方法が採
られているが、その際のシアン化金塩溶液の冷却
温度は５〜10℃で、金濃度約20g／以下のアル
カリ金属のシアン化金塩溶液からシアン化金塩を
析出することができず、決して効率の良い製造方
法とは云えないものである。この為、アルカリ金
属のシアン化金塩溶液を５℃以下の温度に下げる
ことが行われるが、アルカリ金属のシアン化金塩
の溶解度の低下が小さいため、製造収率を大巾に
向上させることが困難であつた。 Traditionally, gold cyanide has been produced by cooling an alkali metal gold cyanide (MAu (CN 2 , MNa or K) solution to precipitate crystals. The cooling temperature of the cyanide gold salt solution is 5 to 10℃, and it is not possible to precipitate cyanide gold salt from an alkali metal cyanide gold salt solution with a gold concentration of about 20 g or less, so this is by no means an efficient production method. For this reason, the temperature of the alkali metal cyanide gold salt solution is lowered to below 5°C, but since the decrease in solubility of the alkali metal cyanide gold salt solution is small, the production yield may be lowered. It was difficult to improve it significantly.
本発明はかかる実状に鑑みてなされたものであ
り、シアン化金塩の製造収率を高めることのでき
る方法を提供せんとするものである。 The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method that can increase the production yield of gold cyanide salts.
本発明によるシアン化金塩の製造方法は、アル
カリ金属のシアン化金塩溶液にアルカリ金属の炭
酸塩を加えて撹拌混合することにより、シアン化
金塩を結晶化させることを特徴とするものであ
る。 The method for producing a gold cyanide salt according to the present invention is characterized in that the gold cyanide salt is crystallized by adding an alkali metal carbonate to a solution of an alkali metal gold cyanide salt and stirring the mixture. be.
本発明のシアン化金塩の製造方法は、塩の飽和
溶液においてその電解質の溶解積は一定の温度で
一定の値を示し、また電解質の溶解度はそれと共
通イオンを持つ他の電解質を加えることによつて
減少するという溶解積の原理に着目し、塩を含む
水溶液中に可溶性塩を溶解することによつて溶解
度の低い塩が析出されるという塩析の技術に、シ
アン化金塩が最も析出しやすいPH領域を見い出し
てなされたものである。即ち、アルカリ金属のシ
アン化金溶液（例えばNa+Au（CN）2）中にアルカ
リ金属の炭酸塩を加え、シアン化金塩の溶解度を
減少し、シアン化金塩を析出するものである。ア
ルカリ金属の炭酸塩、Na2CO3やK2CO3は、水に
溶け、PH12〜14を示す。他方アルカリ金属のシア
ン化金塩はアルカリ水溶液中で
M+＋Au（CN）2MAu（CN）2
の平衡を示すが、PH14以上の強アルカリ中では、
実際の反応は左側に移行して、MAu（CN）2塩が
析出しずらくなる。なお、酸性側では
Au（CN）2-＋H+HAu（CN）2
HAu（CN）2→HCN↑＋AuCN
となり反応が右へ移動し、不安定なシアン化金酸
（HAu（CN）2）を生成する。本発明は、M+の濃度
を高めるという塩析技術をシアン化金塩の最適析
出条件（PH＝12〜14）にて使用することによつ
て、収率よく製造するところにある。 In the method for producing cyanide gold salt of the present invention, the solubility product of the electrolyte in a saturated solution of the salt exhibits a constant value at a constant temperature, and the solubility of the electrolyte is determined by adding another electrolyte having a common ion with it. Focusing on the principle of the solubility area, which decreases as a result of salt-containing aqueous solutions, we focused on the salting-out technique in which a salt with low solubility is precipitated by dissolving a soluble salt in an aqueous solution containing salt. This was done by finding an easy-to-use PH range. That is, an alkali metal carbonate is added to an alkali metal gold cyanide solution (for example, Na + Au (CN) 2 ) to reduce the solubility of the cyanide gold salt and precipitate the cyanide gold salt. Alkali metal carbonates such as Na 2 CO 3 and K 2 CO 3 are soluble in water and have a pH of 12 to 14. On the other hand, the alkali metal cyanide gold salt exhibits an equilibrium of M + +Au(CN) 2 MAu(CN) 2 in an alkaline aqueous solution, but in a strong alkali with a pH of 14 or higher,
The actual reaction shifts to the left, making it difficult for MAu(CN) 2 salt to precipitate. In addition, on the acidic side, Au(CN) 2- +H + HAu(CN) 2 HAu(CN) 2 →HCN↑+AuCN, the reaction moves to the right, and unstable cyanauric acid (HAu(CN) 2 ) is produced. generate. The present invention is directed to high-yield production by using a salting-out technique of increasing the concentration of M + under optimal precipitation conditions (PH = 12 to 14) for gold cyanide salts.
尚、シアン化金塩液中に加える可溶性塩として
は、その他にNaHCO3、K2SO4、KOH、NaOH等
があるが、NaHCO3やK2SO4は弱アルカリでシア
ン化金酸（HAu（CN）2）となりやすく、また、
KOHやNaOHは強アルカリ、PH＝14となつて一
度できたMAu（CN）2が逆解離しやすいため、製
造収率は悪かつた。 Other soluble salts to be added to the cyanide gold salt solution include NaHCO 3 , K 2 SO 4 , KOH, NaOH, etc., but NaHCO 3 and K 2 SO 4 are weak alkalis and can be added to cyanauric acid (HAu). (CN) 2 ) is likely to occur, and
KOH and NaOH are strong alkalis, and when the pH reaches 14, the MAu(CN) 2 formed once is likely to undergo reverse dissociation, resulting in poor production yields.
次に本発明によるシアン化金塩の製造方法の具
体的な実施例について説明する。 Next, specific examples of the method for producing gold cyanide salt according to the present invention will be described.
（実施例）
シアン化金カリウム溶液（金濃度20.50g／）
の液40ml中に炭酸ナトリウムを8g添加し、スタ
ーラーにて30分常温にて撹拌混合し、１時間静置
させてシアン化金ナトリウムを結晶化した。その
後結晶を濾別し、濾液の金を測定したところ、
0.47g／で20g／を大巾に下回り製造収率の高
いものであつた。(Example) Potassium gold cyanide solution (gold concentration 20.50g/)
8 g of sodium carbonate was added to 40 ml of the solution, stirred and mixed using a stirrer at room temperature for 30 minutes, and allowed to stand for 1 hour to crystallize gold sodium cyanide. After that, the crystals were filtered out and the gold content of the filtrate was measured.
The production yield was 0.47g/far below 20g/, indicating a high production yield.
（比較例）
シアン化金カリウム溶液（金濃度57.21g／）
の液20ml中に塩化カリウムを6g添加し、スター
ラーにて30分常温にて撹拌混合し、１時間静置さ
せてシアン化金カリウムを結晶化した。その後結
晶を濾別し、濾液の金を測定したところ5.56g／
で20g／を大巾に下回り製造収率の高いもの
でつあたが、実施例に比べ濾液に残る金は多かつ
た。(Comparative example) Potassium gold cyanide solution (gold concentration 57.21g/)
6 g of potassium chloride was added to 20 ml of the solution, stirred and mixed using a stirrer at room temperature for 30 minutes, and allowed to stand for 1 hour to crystallize gold potassium cyanide. After that, the crystals were filtered out and the gold content in the filtrate was measured to be 5.56g/
Although the production yield was much lower than 20 g/yield, the amount of gold remaining in the filtrate was larger than in the examples.
以上の説明で判るように本発明のシアン化金塩
の製造方法によれば、シアン化金塩を効率良く結
晶化できるので歩留が大巾に向上する。また本発
明のシアン化金塩の製造方法を、シアン化金塩廃
液から金を回収する工程に利用すれば、シアン化
金塩廃液からシアン化金塩のみの結晶が得られ、
これを加熱分解、金属還元、電気分解、硫酸分
解、塩酸分解などによつて分解するだけで金が得
られるので、金回収の省力化に寄与するところ大
なるものである。 As can be seen from the above description, according to the method for producing a gold cyanide salt of the present invention, the gold cyanide salt can be efficiently crystallized, so that the yield is greatly improved. Furthermore, if the method for producing gold cyanide salt of the present invention is used in the process of recovering gold from gold cyanide waste liquid, crystals of only gold cyanide salt can be obtained from the gold cyanide waste liquid,
Since gold can be obtained simply by decomposing this by thermal decomposition, metal reduction, electrolysis, sulfuric acid decomposition, hydrochloric acid decomposition, etc., it greatly contributes to labor saving in gold recovery.
Claims (1)
金属の炭酸塩を加えて撹拌混合し、アルカリ金属
のシアン化金塩を結晶化させることを特徴とする
シアン化金塩の製造方法。1. A method for producing a cyanide gold salt, which comprises adding an alkali metal carbonate to an alkali metal cyanide gold salt solution and stirring and mixing the alkali metal cyanide gold salt solution to crystallize the alkali metal cyanide gold salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6650678A JPS54157798A (en) | 1978-06-02 | 1978-06-02 | Manufacture of gold cyanide salt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6650678A JPS54157798A (en) | 1978-06-02 | 1978-06-02 | Manufacture of gold cyanide salt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54157798A JPS54157798A (en) | 1979-12-12 |
| JPS6250408B2 true JPS6250408B2 (en) | 1987-10-24 |
Family
ID=13317774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6650678A Granted JPS54157798A (en) | 1978-06-02 | 1978-06-02 | Manufacture of gold cyanide salt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54157798A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2588561B2 (en) * | 1988-01-29 | 1997-03-05 | 田中貴金属工業株式会社 | Method for producing gold cyanide powder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842966A (en) * | 1971-10-07 | 1973-06-21 |
-
1978
- 1978-06-02 JP JP6650678A patent/JPS54157798A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54157798A (en) | 1979-12-12 |
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