Analyzed are the mass-operational characteristics of the magnetic control of ferro-impurities of raw materials (quartz sand, feldspar, gypsum), obeying the exponential both completely and partially (tail section), when the use of an experimental-calculation model for controlling ferro-impurities is possible taking into account the corresponding amendments. On the example of using different field sources, it is shown that the results of magnetic control with a limited number of operations differ significantly among themselves, and with an unlimited one (experimental calculation method), despite the change in the & # 171; form & # 187; mass-operating characteristics remain practically the same
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