Hydrometallurgy of base and precious metals

贱金属和贵金属的湿法冶金本提案概述了一项计划，以继续在与贱金属和贵金属的回收和加工有关的一些重要领域进行研究和开发。硫化镍的压力浸出是研究的第一个领域。压力浸出是传统冶炼工艺的替代方法，涉及将镍和副产物金属直接提取到水基溶液中。然后，通过一系列工艺从溶液中回收金属。将研究单质硫的行为和控制。可以添加表面活性剂来分散矿物表面的硫，使浸出继续进行。研究了从金厂废水中回收金属和氰化物的方法。在这项工作中，将使用含有定制化学萃取剂或离子交换树脂的有机溶液（溶剂），从金厂废水的废液中选择性地提取目标金属和氰化物。这将使副产品金属回收和氰化物循环利用，确保经济和环境效益。研究了高温高压条件下铁沉淀的形成，以期制备富硫酸铁矿物浸出液。该方法已在老挝的一家铜加工厂得到应用。在这项工作中，将更深入地了解碱性沉淀的形成和析出，以期开发金属提取和回收方面的新应用。

Hydrometallurgy of Base and Precious MetalsThis proposal outlines a program to continue research and development in a number of important areas related to recovery and processing of base and precious metals.The pressure leaching of nickel sulfides is the first area of investigation. Pressure leaching is an alternative to conventional smelting processes and involves direct extraction of nickel and by-product metals into a water-based solution.  The metals are then recovered from solution by a number of processes.  The behaviour and control of elemental sulfur will be studied.  Surfactants can be added to disperse sulfur from mineral surfaces, allowing leaching to proceed.The recovery of metals and cyanide from gold mill effluents will be investigated.  In this work, the use of organic solutions (solvents) containing tailored chemical extractants, or ion exchange resins, will be used to selectively extract target metals and cyanide from waste solutions from gold mill effluents.  This will allow by-product metal recovery and cyanide recycle, ensuring economic and environmental benefits.The formation of iron precipitates under high temperature and pressure conditions will be studied with a view to preparation of ferric sulfate rich solutions for mineral leaching.  This approach has been developed for application at a copper processing plant in Laos.  In this work, a deeper understanding of the formation and releaching of the basic precipitate will be undertaken with a view to development of new applications in metal extraction and recovery.