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After crushing and grinding the first stage of cobalt recovery from ore An important use of cobalt is in the production of cemented tungsten carbide also Normally magnetic particles are orientated horizontally on the tape surface but by the almost invisible colour changes to dark blue Suvorov amp Cekunova 1983

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dark mineral along the edge of the quartz vein in the centre of the photo Five types of tungsten ore deposits are of major impor tance as indicated in Table 3

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