Flotation of low grade siliceous calcareous phosphate ore
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Central Metallurgical R. & D. Institute, Cairo
 
 
Publication date: 1998-01-01
 
 
Physicochem. Probl. Miner. Process. 1998;32(1):243-253
 
ABSTRACT
This investigation deals with the concentration of low grade siliceous-calcareous phosphate ore by flotation. The ore consists mainly of friable fragments, collophane, carbonate and hydroxyapatite associated with quartz, calcareous and clayey materials. An attempt of upgrading this phosphate ore, assaying 14.37% P2O5, 40.65% CaO, 8.85% MgO, 2.55% R2O3, 17.05% SiO2 and 16.6% CO2, by flotation was made using an adopted technique of bulk-roughing flotation. A new flotation machine, of ‘mechanical type’, with previously established optimum design parameters was successfully used. Optimization of the main concerning variables of the flotation process including chemical reagents, modifiers, depressant, collector, pulp density, air flowrate and time, was conducted. Concentration of the phosphate ore was successfully achieved by anionic flotation with fatty acid collector 3.5 kg/ton, 20% oleic acid in kerosene, and depression of siliceous-calcareous gangue with water glass 0.2 kg/ton at low pulp density (14% solids) and an air flow rate of 0.22 m3/min/m2. A rougher flotation concentrate of high recovery 88.8% and grade 29.12% P2O5 was obtained. Cleaning gave rise to phosphoconcentrate of very high grade 32.41% P2O5%, and recovery (overall recovery 68.78%), and very low silica content 1.91%, which seems to be a suitable marketable concentrate grade.
eISSN:2084-4735
ISSN:1643-1049
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