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Mineralogical factors affecting the separation behavior of Ta-Nbbearing minerals in the gravity field : mineral grain size, liberation, and association relationship

Cheng Hongwei, Xu Jian, Wang Shoujing, Lv Zihu, Wei Fushuai, Zhao Dengkui, Wu Dongyin

Physicochemical Problems of Mineral Processing

2023

Vol. 59, iss. 6

art. no. 174504

Gravity separation is the primary method used to beneficiate Ta-Nb-bearing minerals, however, it performs poorly in low-grade and fine-grained ores. A comparative study of gravity separation products (concentrate, middlings, and tailings) reveals the factors affecting the separation behavior of Ta-Nb-bearing minerals in the process combined with a spiral chute and shaking table from the perspective of mineralogy. The results reveal that columbite-tantalite is the principal Ta-Nb-bearing mineral. As the grinding time increases, the grade of Ta and Nb in concentrate increases significantly. The grain size of columbite-tantalite in the concentrate is the coarsest, followed by that in the middlings, and the finest in the tailings, which are mainly distributed in the range of -150+38 μm, -75+20 μm, and -38 μm, respectively. The liberation degree of columbite-tantalite in the concentrate and tailings is positively correlated with grinding time, while that in the middlings is negatively correlated with grinding time. The density of columbite-tantalite-bearing particles in concentrate is mainly distributed above 3 or even 4, due to the high liberation degree of the columbite-tantalite in the concentrate, as well as the high amount of rich intergrowth associated with heavy minerals. The density of Ta-Nb-bearing mineral particles in the middlings and tailings is predominantly distributed in D<3, owing to columbite-tantalite mainly associated with lighter gangue minerals such as quartz, albite, and orthoclase. It demonstrates that the liberation degree is not the most essential factor in determining columbite-tantalite separation behavior in the gravity field, and the mineralogical characteristics of columbite-tantalite including grain size, association relationship, and particle density, may be more important. The results of this investigation can provide theoretical support for the strengthening separation of low-grade tantalum-niobium ore.

Mineralogiczna i chemiczna charakterystyka odpadów wydobywczych z kopalń węgla kamiennego

Bzowski Z.

Wiadomości Górnicze

2013

R. 64, nr 2

93-98

W artykule przedstawiono wyniki badań mineralogicznych i chemicznych odpadów wydobywczych z kopalń wschodniej części Górnośląskiego Zagłębia Węglowego. Pod względem mineralogicznym we wszystkich badanych odpadach wydobywczych stwierdzono obecność kwarcu, skalenia potasowego i plagioklazu, muskowitu i illitu, kaolinitu oraz chlorytów. Ze względu na charakter petrograficzno-mineralogiczny wśród badanych odpadów wyróżniono trzy grupy: pierwsza z przewagą piaskowców, druga to mieszanina iłowców piaskowców i mułowców z przewagą tych ostatnich, a trzecia o wyraźnie ilastym charakterze.

This paper presents the results of mineralogical and chemical studies of wastes generated from mines in the eastern part mining of the Upper Silesian Coal Basin. In terms of mineralogical studies all mining wastes subjected to investigations revealed the presence of quartz, K-feldspar and plagioclase, muscovite and illite, kaolinite and chlorites. From the viewpoint of the petrographic-mineralogical character among the investigated wastes three groups were distinguished: the first one with a predominance of sandstones, the second one consisting of claystones, sandstones and mudstones with a predominance of the latter, and the third one with a strong clayey character.