Selective Leaching of Manganese Nodules Using Sulfur Dioxide as a Reductant

使用二氧化硫作为还原剂选择性浸出锰结核

• 批准号: 01550525
• 负责人: KAWAHARA Masayasu
• 金额: $ 1.34万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550525/
• 关键词: Manganese nodules; Sulfur dioxide; Selective leaching; Extractive metallurgy of nickel; Extractive metallurgy of cobalt; Reduction leaching; Ammonia leaching

The selective extraction of nickel, cobalt and copper from manganese nodules was achieved by using ammoniacal solution as a solvent and using sulfur dioxide as a reductant. The selective extractability was a pronounced with raising leaching temperature. When the nodules were leached in the solution using lower concentrations of ammonium ion, manganese and iron were also extracted considerably at lower concentrations of sulfur dioxide. The suitableness of selective extraction was decided by pH of the solution, and the limit value was estimated at pH=6.Manganese ammonium sulfite hydroxide was detected as a leaching residue using ammonia solution as a solvent, and manganese carbonate was detected at the ammonium carbonate solution leaching. When the nodules were leached in the mixed solution of ammonia and ammonium carbonate using sulfur dioxide as as a reductant, the extraction of manganese was lower using higher concentrations of ammonium carbonate, and that of iron was lower using higher concentrations of ammonia water.The extraction percentages of metallic components under optimum conditions were 99% for copper, 98% for nickel, 95% for cobalt, 3% for manganese and 1% for iron, respectively. This method of leaching may be effective for the treatment of manganese nodules because there are high extraction of valuabl emetals and good selective extractability.

以氨溶液为溶剂，以二氧化硫为还原剂，实现了锰结核中镍、钴和铜的选择性萃取。随着浸出温度的升高，其选择性提取率显著提高。当锰结核在较低浓度的铵离子溶液中浸出时，锰和铁在较低浓度的二氧化硫中也被大量提取。选择提取的适宜性由溶液的pH决定，pH=6时估计其极限值。以氨溶液为溶剂浸出残渣检测亚硫酸铵锰，以碳酸铵溶液浸出残渣检测碳酸锰。在以二氧化硫为还原剂的氨和碳酸铵混合溶液中浸出结核时，高浓度碳酸铵对锰的提取率较低，高浓度氨水对铁的提取率较低。在最佳条件下，铜、镍、钴、锰、铁的提取率分别为99%、98%、95%、3%和1%。该浸出方法对锰结核有价金属提取率高，可选择性好，是锰结核处理的有效方法。