Abstract
Gravity methods are widely used for processing of gold ores. But many aspects of these processing techniques require improvement. In the study, methods of fire assay, gravimetric, chemical, mineralogical analyses of gold ores were used. In terms of sulfide sulfur content and degree of sulfur oxidation, the gold ore is assigned to the low-sulfide type of ore in the primary zone. Mineralogical analysis showed the ore-bearing rock is represented by phyllite. Gold in the ore occurs mainly in the form of free large and fine particles. The fine gold is closely associated with pyrite. GRG test was carried out for assessing gravity dressability of the gold ore. The total gold recovery is more than 41 %. The highest gold recoveries were achieved at the first stage at 100 % of -1.6 mm ore grain size, and at the third stage at 80 % of -0.071 mm ore grain size. This indicates that both relatively large gold and fine free gold particles are present in the ore. This is also confirmed by mineralogical analysis. The GRG test results showed that the gold ore can be effectively concentrated using centrifugal concentrators. The level of gold recovery by gravity at the multi-stage ore grinding is quite high. When developing the ore concentration process flow sheet, gravity separation in centrifugal concentrators should be included.
Highlights
Gravity methods are widely used for processing of gold ores
Total percentage of gold recovered by gravity depending on the ore grain size
Koppalkar S. et al Understanding the discrepancy between prediction and plant GRG recovery for improving the gold gravity performance
Summary
Рентгенодифрактометрический анализ средних проб выполнен на дифрактометре ДРОН-4 с CuKa-излучением, β-фильтр. Рентгенофазовый анализ на полуколичественной основе проведен по дифрактограммам порошковых проб с применением метода равных навесок и искусственных смесей. Оценку гравитационной обогатимости золотосодержащей руды методом GRG-теста проводили на центробежном концентраторе Нельсона (KC-MD3) при следующих режимах: центробежное ускорение – 60G; расход флюидизирующей воды – 3,5 дм3/мин; производительность по твердому – 0,5–0,6 кг/мин; избыточное давление флюидизирующей воды – 10–14 кПа; содержание твердого в пульпе, подаваемой на гравитационное обогащение, – 25–30 %. На 1-й стадии руду массой 10 кг дробили до крупности 100 % класса –1,6 мм и дробленую руду пропускали через концентратор Нельсона. Далее хвосты первой стадии доизмельчали до крупности 80 % класса –0,3 мм и пропускали через концентратор Нельсона. На 3-й стадии хвосты 2-й стадии доизмельчали до крупности 80 % класса –0,071 мм.
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