印度的斯特里卡库拉姆(Strikakulam)和维斯克哈帕特南姆(Viskhapatnam)矿区的锰矿从1890年就开始开采。大部分的高品位矿石现在已经采尽,仅剩合15—30%Mn和0.35—0.45%P的贫矿。进行了研究,以便确定最合适的选矿方法,特别重要的是磷含量要降到0.17%甚至更低。筛分分析表明,全部矿石粒度均小于50毫米,其小80%在26毫米+8网目之间。有一趋向,锰富集于较粗粒部分中,磷含量随着粒度的减小而提高。有迹象表明,粗粒物料可用重选法,细粒可用浮选法选别。采用丹佛实验室用的跳汰机选别 Manganese mines in Strikakulam and Viskhapatnam mines in India began mining in 1890. Most of the high grade ore is now depleted, leaving only lean mines with 15-30% Mn and 0.35-0.45% P remaining. Research was conducted to determine the most suitable beneficiation method, and it is especially important that the phosphorus content be reduced to 0.17% or lower. The sieve analysis showed that all the ores were less than 50 mm in size and 80% smaller at 26 mm + 8 mesh. There is a tendency that manganese is enriched in the coarser part, and phosphorus content increases as the particle size decreases. There are indications that the coarse material available re-election method, the fines can be used flotation method. Denver laboratory used jig selection