Heavy media separation is crushed into a certain particle size of ore, into the density is greater than the water in the fluid (i.e., dense medium), according to the principle of buoyancy, the density is less than the medium particles will float, and the density is greater than medium ore material will sink, intercept respectively two kinds of product, it realized the heavy media separation. Thus, the heavy media separation completely belongs to static process, the fluid movement and the settlement of particles are no longer a layered main effect factors, and the nature of the medium itself is choose other important factors. After the strong, water sand coal preparation method, soon appeared in the world and utilization of magnetite, barite, pyrite and loess dense medium coal preparation method. First appeared in magnetite ore slurry dense medium coal preparation method is (kang Lin Xuan coal method) in 1922. 1936, groom with coal grinding fine magnetite suspension in the Netherlands, and use the settlement of magnetite formed in sorting machine of different density separation. But magnetite really dense medium coal preparation process widely used only after using magnetic separator recycles 60 magnetite.
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