Thermochemical properties of hydrothermal alkaline solutions and their application to metal extraction.

热液碱性溶液的热化学性质及其在金属萃取中的应用。

• 批准号: 05403019
• 负责人: TOKUDA Masanori
• 金额: $ 10.56万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05403019/
• 关键词: hydrothermal reaction; hydrothermal oxidation; hydrothermal leaching; dissolution rate; kinetics; alkaline solution; hot solution; hydrolysys; not solution; in-situ analysys; spectrometry; in-situ analysis; hydrolysis

1. <Dissolution mechanism of Tin and Zine in NaOH Solutions at elevated Temperatures and its application to scrap recycling of surface coated steel plates>The dissolution behavior of metallic tin plate in aqueous sodium hydroxide solutions was investigated. The dissolution rate was mainly controlled by the diffusion of dissolved oxygen at temperatures higher than 30ﾟC and NaOH concentration higher than 0.1 mol/1-H20. It increase with the increase in temperature and in rotation speed, while a maximum rate was observed as incresing NaOH concentration. These results were applied to the recycling treatment of surface coated steel plates.2. <Enhanced Dissolution of Copper in Cupric Ammine Solutions at elevated Temperatures and its application to removal of Cu from steel scraps.>The dissolution rate of metallic copper plate in aqueous cupric ammine solutions was mainly controlled by chemical reaction at temperatures below 30ﾟC,and by diffusion of cupric complex at temperatures higher than 40 … More ﾟC.It increase with an increase in temperature and rotation speed, while a maximum rate was observed for increasing Cu (II) concentration. The effect of different anion showed significant results on dissolution rate of copper and iron, and carbonate ion was found to prevent the corrosion of iron. From the result, a method to remove Cu from steel scraps was proposed.3. <Solubility of Nb205 and leaching behaviors of Nb and Ta from niobite in KOHsolutions have been investigated in order to develop an alkali hydrothermal leaching prcess of Nb and Ta.>The solubility of Nb 205 was measured in the range of 40ﾟC to 200ﾟC at various molar ratios (K/Nb) of K20 to Nb205. Nb205 shows the maximum solubility at the solution composition of K/Nb=4/3 at a given temperature. The rise of temperature causes the solubility of Nb205 to increase at the temperatures below 120ﾟC,but decrease above 120ﾟC.The maximum leaching degree of about 90% was obtained at 200ﾟC.It was proved that the alkali hydrothermal leaching process is effective for the recovery of Nb and Ta from the niobite concentrate. Less

1. <锡和锌在NaOH溶液中的高温溶解机理及其在表面涂层钢板报废回收中的应用>研究了金属锡板在氢氧化钠水溶液中的溶解行为。溶解速率主要受温度高于30℃和NaOH浓度高于0.1 mol/1-H2O时溶解氧的扩散控制。它随着温度和转速的增加而增加，而随着 NaOH 浓度的增加观察到最大速率。研究结果应用于表面涂层钢板的回收处理。 2． <铜在铜氨溶液中的高温强化溶解及其在废钢中去除铜中的应用。>金属铜板在铜氨溶液中的溶解速率在低于30℃时主要受化学反应控制，在高于40℃时主要受铜络合物的扩散控制。溶解速率随着温度和转速的增加而增加，同时观察到最大速率 增加 Cu (II) 浓度。不同阴离子的影响对铜和铁的溶解速率显示出显着的结果，并且发现碳酸根离子可以防止铁的腐蚀。根据研究结果，提出了一种从废钢中去除Cu的方法。 3． <为了开发铌和钽的碱水热浸出工艺，研究了 Nb205 的溶解度以及铌矿在 KOH 溶液中的浸出行为。>在 40°C 至 200°C 的范围内，在 K20 与 Nb205 的不同摩尔比 (K/Nb) 下测量了 Nb205 的溶解度。 Nb 2 O 5 在给定温度下在K/Nb=4/3的溶液组成下显示出最大溶解度。温度的升高导致Nb2O5的溶解度在120℃以下增加，而在120℃以上则降低。200℃时浸出率最大，约为90%。证明碱水热浸出工艺对于从铌铁矿精矿中回收Nb和Ta是有效的。较少的

项目成果

Satoshi Uchida: ""Dissolution of Copper in Agueous Cupric Ammine Solutions"" ISIJ International. Vol. 36. 522-527 (1996)

Satoshi Uchida：“铜在铜胺溶液中的溶解”ISIJ International。

内田聡: "鉄スクラップからの銅の回収" 資源処理技術. 41. 32-33 (1994)

Satoshi Uchida：“从铁废料中回收铜”资源加工技术。41. 32-33 (1994)。

内田聡: "Dissolution of Copper in Aqueous Cupric Ammine Solutions" ISIJ International. 36. 522-527 (1996)

Satoshi Uchida：“铜在铜胺溶液中的溶解”ISIJ International 36. 522-527 (1996)。

周康根,徳田昌則: "水熱科学ハンドブック" 技報堂, (1996)

Yasuken Zhou、Masanori Tokuda：《热液科学手册》Gihodo，（1996）