Study on magnetic separation method with low content zinc ore at Cho Dien mine, Cho Don district, Bac Kan province to produce industrial fine ore

Cho Dien mine is a multi-metal ore mine. Ores exist mainly in two forms: zinc sulfide, zinc oxide. Zinc oxide form is divided into two types: brown zinc oxide ore and black zinc oxide ore. Two types of zinc oxide ore have common properties: highly weathered ore; largely proportional fine particles; high iron content; low zinc content; non-magnetic iron minerals; disseminated rock, non-ore and ore particles with fine to very fine dimensions. Brown zinc oxide ore: zinc minerals are mostly calamine. Besides, this ore contains a lot of clay mineral and rock. This ore is easy for separation. Using methods of gravity separation, the magnetization process by heating, wet magnetic separation, the recovery yields reached: 79,94% with fine zinc ore (zinc content of 25,35%) and 64,68% with fine iron ore (TFe content of 62,86%). Black zinc oxide ore: Useful and non-useful minerals are diverse and complex, closely symbiotic relationships together. Zinc mineral is mostly chalcophanite. Manganese element almost does not exist as an independent mineral, but exist in the composition of zinc minerals, occupying the position of zinc in the chalcophanite mineral crystal structure. This ore is very difficult for enrichment. It can not be processed if traditional separation methods were used. (author)