了解红土矿石团聚行为是强化堆浸的前兆

J. Addai-Mensah, I. Quaicoe, A. Nosrati, D. Robinson
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引用次数: 1

摘要

虽然镍(Ni)红土矿占世界范围内镍矿化资源的大部分,但与镍硫化物相比,通过常规选矿(如多重和浮选)和湿法冶金路线处理它们是棘手的,因为它们在矿物学和化学上都主要是低品位和复杂的。由于其物理化学特性,低品位红土矿石需要更积极但昂贵的化学和湿法冶金技术(例如,在高压罐中浸出)来提取贵重金属(Ni和Co)。通过具有成本竞争力的堆(4-10米高)浸出作为替代方法来处理这些矿石,需要成功地将饲料团聚成坚固而多孔的颗粒。迄今为止,生产具有理想属性的颗粒对工业构成了重大的岩土技术挑战。在目前的工作中,我们研究了硅质针铁矿镍红土矿石和选定的氧化物和粘土矿物(赤铁矿、石英和高岭石)的团聚行为,这些氧化物和粘土矿物构成了典型低品位镍红土矿石的主要矿岩相。基本的知识和理解的团聚机制和动力学,这是必不可少的生产稳健的真正的矿石颗粒,关键是随后的堆浸过程,被收集。等温,批量团聚试验涉及30%和44% w/w的硫酸溶液作为粘合剂,表明在8-14分钟内产生了5- 40毫米不同粗糙度和形态的颗粒。结果显示了饲料特性(例如,矿物学和粒度分布)和粘合剂含量(15-25 wt.%)取决于团聚行为。高岭石黏土矿物表现出较慢的团聚成核和生长,而氧化物表现出较快的团聚动力学。硅质针铁矿原料的细/粗比、h2so4粘结剂用量和酸含量、产品干燥温度和老化条件对颗粒润湿、成核和生长过程等团聚机制和粒度、强度等颗粒属性均有显著影响。团聚体强度随细/粗颗粒比的增大而增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding Lateritic Ore Agglomeration Behaviour as a Precursor to Enhanced Heap Leaching
Although nickel (Ni) laterite ores constitute the majority of Ni mineralization resource world-wide, in contrast to Ni sulphides, their processing via conventional beneficiation (e.g. multi-gravity and flotation) and hydrometallurgical routes is intractable as they are predominantly low grade and complex, both mineralogically and chemically. Due to their physico-chemical character-istics, low grade lateritic ores require more aggressive but costly chemical and hydrometallurgical techniques (e.g., leaching in high pressurized tanks) for value metal (Ni and Co) extraction. Processing such ores through cost-competitive heap (4-10 m high) leaching as an alternative, requires successful agglomeration of the feed into robust and porous granules. To date, produc-ing of granules with desirable attributes poses a major geotechnical challenge to industry. In the present work, we investigate agglomeration behaviour of siliceous goethite Ni laterite ore and selected oxides and clay minerals (hematite, quartz and kao-linite) which constitute the predominant host gangue phases of typical low grade Ni laterite ores. Fundamental knowledge and understanding of the agglomeration mechanisms and kinetics which are essential for producing robust real ore granules, and pivotal to the subsequent heap leaching process, are gleaned. Isothermal, batch agglomeration tests involving 30 and 44 % w/w sulphuric acid solution as a binder indicated that 5 – 40 mm granules of differing roughness and morphologies were produced in 8-14 min. The results showed feed characteristics (e.g., mineralogy and particle size distribution) and binder content (15-25 wt.%) dependent agglomeration behaviour. Slow agglomerate nucleation and growth were displayed by the kaolinite clay min-eral whilst the oxides exhibited faster agglomeration kinetics. Siliceous goethite feed ore fine/coarse ratio, H 2 SO 4 binder dosage and acid content, product drying temperature and aging conditions, all showed significant impact on agglomeration mecha-nisms (e.g., particle wetting, nucleation and growth processes) and granule attributes (e.g., size and strength). Agglomerates strength increased with increasing fine/coarse particle ratio.
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