Abstract
Most magnesite deposits in Yugoslavia contain serpentine and olivine as impurities. Heavy medium separation is used for the beneficiation of raw magnesite ore with particle size greater than 0.35 ram. The results of investigations reported in this work indicate a possibility of efficient removal of serpentine and olivine using HGMS and superconducting magnetic separators for fines smaller than 0.35 ram. Based on these results a new technological process for magnesite upgrading was established. The process combines the gravity and magnetic separation processes for treatment of raw material, as well as for magnesite after its decarbonisation. It is possible to upgrade the magnesite fines below 0.35 mm which are rejected from the conventional processes. The grade of the magnesite concentrate of 98% and above may be obtained using this process.
Highlights
The plant with gravity separation in magnetic suspensions built in the magnesite mine "Goles" contains two technological circuits:-gravity concentration of raw magnesite, preconcentration and -gravity concentration of the pre-concentrate from the first circuit, after decarbonisation and hydration.M.R
The technology of the process consists of the following stages: ao The crushing of the ore to the desired size limit which depends on the required degree of liberation of impurities on the one hand, and on the capabilities of the concentrating equipment and imposition by the subsequent products on the other hand
Separation in heavy medium of decarbonised and hydrated products. In this stage the magnesium oxide and magnesium hydroxide float while silicate-bearing impurities such as undissociated carbonates report in the sink product
Summary
:University of Belgrade, Faculty of Mining and Geology, Belgrade, University of Belgrade, Technical Faculty Bor, Bor, Yugoslavia (Received February 7, 1995, accepted March 23, 1995)
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