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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.1 Oct 19-23, 2002 Montreal, Quebec, Canada >Use of Chlorine for Mineral Processing, Metal Extraction and Recycling via the Synthesis of a New Reagent
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Use of Chlorine for Mineral Processing, Metal Extraction and Recycling via the Synthesis of a New Reagent

机译：通过合成新试剂将氯用于矿物加工，金属提取和再循环

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摘要

This paper summarises laboratory experiments on chlorination processes developed for the extraction of Ta and Nb from tin slags, the recovery of Co, Ni, Mo and V from spent hydrodesulphurization catalysts, upgrading chromite, treatment of sulphide concentrates, decontamination of jarosite, as well as the synthesis of potassium ferrate containing iron in the hexavalent state. Each investigation started with a thermodynamic study of the different systems (M-O-Cl, M-S-Cl, M = metal) including the calculation of the standard free energy of these chlorination reactions and the phase stability diagrams. The kinetics of these chlorination reactions was studied by the thermogravimetric analysis technique. The effects of total gas flow rate, temperature and reactant partial pressures on the chlorination reaction rate were investigated. Besides, boat experiments were also performed. Several qualitative and quantitative analytical methods were used to evaluate the selectivity and performance of the chlorination processes. The results show the advantages of the chlorination technology in term of selectivity of the processes, the recovery rate of valuable metals, energy savings, the possibility to treat lean raw materials, improved decontamination of wastes thus generating environmentally safe residues and the synthesis of new compounds.
机译：本文总结了为从锡渣中提取Ta和Nb，从废加氢脱硫催化剂中回收Co，Ni，Mo和V所开发的氯化工艺，进行铬铁矿精制，硫化物精矿的处理，黄铁矿的去污以及黄铁矿的净化实验。合成六价态含铁高铁酸钾。每次研究均始于对不同系统（M-O-Cl，M-S-Cl，M =金属）的热力学研究，包括计算这些氯化反应的标准自由能和相稳定性图。通过热重分析技术研究了这些氯化反应的动力学。研究了总气体流量，温度和反应物分压对氯化反应速度的影响。此外，还进行了船实验。几种定性和定量分析方法用于评估氯化过程的选择性和性能。结果表明，氯化工艺的优势在于工艺的选择性，有价金属的回收率，节约能源，处理稀薄原材料的可能性，改善的废物净化能力，从而产生对环境安全的残留物以及新化合物的合成。

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