INCO Cyanide destruction insights from plant reviews and laboratory evaluations

P. Breuer, D. Hewitt
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引用次数: 6

Abstract

ABSTRACT Insights from a number of INCO cyanide destruction process reviews and studies are presented and discussed. In particular, the performance of three plants are discussed in terms of reagent (sulfite and oxygen) stoichiometry and utilisation, and the impact of process design, control, reagent addition points and slurry properties. Discussed also is the effectiveness of hydrogen peroxide use (supplementary oxygen source) in two of the plants reviewed. Oxygen mass transfer often limits the capacity of an INCO process. Hydrogen peroxide addition can improve the capacity, though process design improvements could provide a better economic outcome. Optimisation of the INCO process requires constant monitoring of feed and discharge weak acid dissociable cyanide concentrations and maintaining low but measurable dissolved oxygen in the reactor (e.g. 2–5 mg L−1). Changing solids properties over time requires adjustment to the sodium metabisulfate-to-weak acid dissociable cyanide weight ratio used for the destruction process control.
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来自工厂审查和实验室评估的氰化物破坏见解
本文介绍并讨论了一些INCO氰化物销毁工艺综述和研究的见解。特别是,从试剂(亚硫酸盐和氧气)的化学计量和利用率以及工艺设计、控制、试剂添加点和浆料性质的影响等方面讨论了三种装置的性能。还讨论了在两个综述的工厂中使用过氧化氢(补充氧源)的有效性。氧气的传质通常会限制INCO工艺的能力。添加过氧化氢可以提高产能,尽管工艺设计的改进可以提供更好的经济结果。INCO工艺的优化需要不断监测进料和排出弱酸可离解氰化物的浓度,并保持反应器中溶解氧低但可测量(例如2-5 毫克 L−1)。随着时间的推移改变固体性质需要调整用于破坏过程控制的偏亚硫酸钠与弱酸可离解氰化物的重量比。
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来源期刊
CiteScore
3.50
自引率
0.00%
发文量
6
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