Dissolution of Metals by Ammonium Thiocyanate Solution.
| Project/Area Number |
60550477
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属精錬・金属化学
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| Research Institution | Chiba Institute of Technology. |
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Principal Investigator |
HATA Kyoshu Chiba Institute of Tecnology., 工学部, 教授 (30083819)
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| Co-Investigator(Kenkyū-buntansha) |
YAMASHITA Satoshi Chiba Institute of Tecnology., 工学部, 助手 (80118710)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Ammonium Thiocyanate / Dissolution / Silver / Zinc Oxide / Manganese Dioxide / Copper Oxide / Nickel Oxide / 酸化コバルト |
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| Research Abstract |
The dissolution rates and the solubilities of the following materials in the solution of <NH_4> SCN were examined at various conditions, and the chemical reactions of dissolution of them were deduced. The tested materials were Ag, ZnO, Mn <O_2> , NiO and Co oxide. The main informations from these examinations are follows.
1. Ag is soluble in the concentrated NH SCN solution as Ag thiocyanate complex. Ag dissolves considerable fast, when <Fe^(3+)> or <Cu^(2+)> is added to the solution at pH 2-3 or 8-10, respectively, and oxygen is blowed in to the solution.
2. ZnO dissolves very fast and in high concentration. Dissolved Zn becomes <Zn^(2+)> and Zn thiocyanate complex in the acidic solution, and Zn ammine complex in the alkaline solution.
3. <MnO_2> is soluble in the acidic solution, and dissolves considerably fast at pH 4. <Mn^(4+)> of Mn <O_2> is reduced to <Mn^(2+)> by <SCN^-> and dissolved by acid.
4. CuO is soluble in the concentrated <NH_4> SCN solution and its dissolution is fairly fast. Dissolved Cu becomes Cu thiocyanate complex in the acidic solution, and Cu ammine complex in the alkaline solution.
5. NiO dissolves very slowly. Dissolved Ni becomes Ni thiocyanate complex in the acidic solution and Ni ammine complex in the alkaline solution.
6. <Co_3> <O_4> is soluble only in the acidic solution and its dissolution is very slow. CoO resulted from thermal decomposition of <Co_3> <O_4> dissolves fairly fast.
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Report
(1 results)
Research Products
(8 results)
