Coarse disseminated weakly magnetic iron ore dissemination size is generally more than 2mm, containing siderite, limonite mostly higher iron. There is often a certain amount of clay in the limonite ore. The coarse-grained weak magnetic iron ore is relatively easy to select, and is generally sorted by washing, re-election (heavy medium, jigging, spiral concentrator ), dry or wet strong magnetic separation and other mineral processing methods.
Among the iron ore processed by the US Sunrise concentrator, 80% of the iron-bearing minerals are soft red earth-like hematite, the rest are hard black crystalline hematite, and the ore contains 42% iron, hematite. Easy to dissociate from the quartz vein. The ore is divided into four levels of 125-38, 38-6.4, 6.4-0.59, and ~0.59 mm through a crushing sieve. The three levels of 125 to 38, 38 to 6.4 mm were respectively subjected to heavy medium sorting using ferrosilicon as a medium. Three grades above 0.59mm are washed first before sorting. The ore is treated by washing, heavy medium, jigging and spiral concentrator, respectively, and the concentrate grade is 48.99%.
The iron ore processed by the steep rock concentrator in Canada is a mechanical mixture of high-grade goethite and gangue, containing 40% to 54% of iron. Using a re-election process combining washing, heavy medium, jigging and spiral concentrator, a mixed concentrate containing 59% iron is obtained.
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