The capacity of an assembly of fine ferromagnetic particles to form large aggregate-floccules under the effect of an external magnetic field or residual magnetization is used extensively in beneficiation of strongly magnetic iron ores to increase the productivity of the plant and improve the selectivity of a number of beneficiatton processes, About 90% of all the iron ore processed is subjected to magnetic beneffciation. However, theoretical and experimental research on magnetic fiocculation is lagging behind practical requirements. The effect of the residence time of the pulp being magnetized in a magnetic field on the results of magnetic flocculation is largely an unknown factor.Recommendations on the necessary duration of magnetization of magnetite pulps are often vague and even contradictory [1-3]. A common feature of most reports [1-6] is that the authors recommend a field intensity of 400 to 600 Oe (32-48 kA/m) and a magnetization period of less than one second$ however, the absolute values of this period vary from 0.2 [1] to 1/15 sec [3].In this paper we attempt to elucidate the role of the duration of magnetization during magnetic floceulatton. Figure 1 shows the layout of the experimental apparatus for studying the effect of the duration of magnetization on the flocculation results.A pulp of given consistency was prepared by mixing water and the product in a mixer 5; it was then fed by pump 6 to two successive separation stages 1. The 10-jet pulp separator I made it possible to feed to the magnetizing apparatus 4 any proportion of the current in the range from 1/100 to 99/100 of the total. The excess pulp was returned to mixer 5 via demagnetizing apparatus 3. Control of the duration of magnetization was effected by varying the volume of pulp handled. A constant pulp level was maintained in the receiver 7 of the apparatus by means of valve 8.The duration of magnetization was determined by the formulawhere L is the path length of the pulp in the magnetization apparatus in meters, S is the cross-sectional area of the magnetization apparatus in m z, and Q is the pulp current,mS/sec.The results of pulp flocculatton were assessed from the settling rate in standard 500 ml measuring cylinders under constant conditions (pulp temperature 291"K and solids content 10 wt.% ); the samples magnetized at higher solids contents (20, 40%) were therefore diluted.The work was performed on magnetite concentrate of the Inguletsk beneficiation combine (see Table 1).In the first stage of the investigations we studied the significance of the magnetization parameters by means of experiments planned by the Box-Wilson method [7]. The experiments were planned on the basis of a two-factor experimental scheme based on the field intensity, H, and the exposure of the material in the field, t. The values Dnepropetrovsk Mining institute.
Введение. Высокий организационный и методический уровень спортивной подготовки с детьми и подростками в значительной степени определяет в дальнейшем успех той или иной страны на международной спортивной арене (
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