| 摘要 |
<p>A method for the hydrometallurgical recovery of metal values from metal sources (11) containing more than one metal such as antimony, lead, copper, zinc, bismuth, tin, cadmium and other metals by leaching the metal containing source (11) with a ferric fluoborate/fluoboric acid solution (12) to provide a metal containing leach solution (16). The leach solution is extracted with organic extractants (19a), ion exchange resins and the like in extractor (17) to provide a loaded extract (18) and a raffinate (25) which contains fluoboric acid produced in the extraction step. The fluoboric acid concentration is reduced in the raffinate by adding to the raffinate a metal oxide (27) of a metal in the raffinate to form an acid adjusted raffinate (28). The acid adjusted raffinate (28) is then electrowon by electrowinning cell (29) or otherwise treated to form the desired metal (30) and to provide a ferric fluoborate solution which is recycled (15) for leaching additional metal containing material. When the metal containing material is a copper bearing material, a copper containing raffinate (25) is treated with copper oxide (27) to control the fluoboric acid in the raffinate.</p> |
