Gold and rare earth elements in enrichment products from the technogenic wastes of the Caspian Mining-Metallurgical Plant (Aktau, Kazakhstan)

IF 0.8 Q4 METALLURGY & METALLURGICAL ENGINEERING
G. Bekenova, V. Peregudov, V. L. Levin, Y.T. Kanatbaev, D.B. Muratkhanov
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Abstract

The paper presents the outcome of a comprehensive study at macro- to nanoscale levels of enrichment products from technogenic wastes. The products were obtained thanks to the experience of gravity enrichment during the treatment and preparation of the gold and REE sample material with preliminary mechanical and thermal activation. Thermal activation was applied for the first time. Native gold was identified in the form of single, micron-sized grains and, according to technological testing of enrichment products, there is a predominance of "invisible" dispersed gold. The gold content in the initial material was 2.93 g/t, which upon thermal activation of the sample increased to 6.37 g/t. According to the spectral analysis and electron probe microanalysis, the products of all enrichment stages are characterized by an increased content of yttrium and REEs. The REEs occurrence forms were determined. REEs are mainly found in micro- and nano-sized fluorine and fluorine-free phosphates (in apatite, by substitution of calcium), in REE-phosphates (in xenotime), and less often, possibly, in complex sulfo-phosphates and phosphate silicates. In thermal products consisting of inhomogeneous aggregates of nanosized phases, according to X-ray phase analysis, considering the elemental composition, REEs are included in the composition of phosphates: florensite and phases Ce(P5O14), Ca8MgSm(PO4)7.
里海采矿冶金厂(哈萨克斯坦阿克套)技术废料富集产物中的金和稀土元素
本文介绍了一项综合研究的结果,从宏观到纳米水平的富集产物的技术废物。通过初步的机械活化和热活化,在金和稀土样品材料的处理和制备过程中经历了重力富集,获得了上述产物。热活化是首次应用。原生金以单一微米级颗粒形式存在,富集产物技术测试表明,“隐形”分散金占主导地位。初始材料的含金量为2.93 g/t,热活化后样品的含金量增加到6.37 g/t。光谱分析和电子探针微量分析表明,各富集阶段产物中钇和稀土的含量均有所增加。测定了稀土元素的赋存形式。稀土主要存在于微和纳米尺寸的氟和无氟磷酸盐(在磷灰石中,通过钙的替代)、稀土-磷酸盐(在xenotime中)中,较少可能存在于复杂的磷酸亚硫酸盐和磷酸盐硅酸盐中。在由纳米相非均匀聚集体组成的热产物中,根据x射线相分析,考虑元素组成,稀土元素包含在磷酸盐组成中:florensite和相Ce(P5O14), Ca8MgSm(PO4)7。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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