According to the magnetic characteristics of weakly magnetic minerals beneficiation method
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According to the magnetic characteristics of weakly magnetic minerals beneficiation method

Published by: Sally (10)
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According to the magnetic characteristics of weakly magnetic minerals beneficiation select the appropriate method, most of the weakly magnetic minerals are paramagnetic. Pure weak magnetic minerals, their magnetic susceptibility values ‚Äč‚Äčthan the magnetic minerals is much smaller than the strong, non-magnetic saturation and hysteresis, magnetic susceptibility and magnetic field strength than the linear relationship between the mineral itself with the shape, size has nothing to do only with the mineral composition. When a small amount of ferromagnetic minerals which when mixed, it will change a lot of magnetic. Principle can be divided according to their magnetic roasting reduction roasting, baking and roasting neutral. (1) reduction roasting for hematite and limonite. Their role in the amount of reducing agent, when calcined to 570 degrees, can be reduced to magnetite. (2) neutral roasting for siderite. Siderite in the air or through the barrier into the case of a small amount of air heated to 300-400 degrees, broken down into magnetite.

(3) for pyrite roasting. Pyrite in oxidizing atmosphere (or access to a lot of air) in a short time after firing into a strong magnetic oxide magnetic pyrite. Such as extended roasting time, the oxidation of pyrrhotite into magnetite continue. Weakly magnetic iron minerals (hematite, limonite, siderite, pyrite, specularite) by magnetic roasting method to artificially improve their magnetic properties. After roasting, or they become, the stronger the magnetic characteristics of magnetic minerals with the same natural, therefore, also called artificial strong magnetic minerals. Only artificial than natural magnetite magnetite remanence large coercive force, while smaller than the magnetic susceptibility. So they are in the process of magnetic ore agglomeration serious, resulting in concentrate quality and recovery rates lower than the natural magnetite.

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