Abstract
AbstractABSTRACT: Low grade phosphate ore of Jhamarkotra that analyzes 16.5% P~2~O~5~ is upgraded to 34% P~2~O~5~ by a two stage flotation process after size reducing the ore to 90% passing through 200mesh using conventional equipment such as jaw and cone crushers followed by ball mills. Re-engineering the flotation circuit reduced the power consumption from 55 kWh per metric ton of ore treated to 50 kWh. Incorporation of roller press in the grinding circuit resulted into further reduction of power consumption to 32 kWh per metric ton of ore treated.
Highlights
Beneficiation of phosphate ores containing carbonate gangue minerals such as calcite and dolomite is one of the toughest problems before mineral process engineers, whereas phosphate ores with siliceous gangue (Florida, Senegal, Matoon ores) can be processed [1] by direct flotation of apatite minerals with soap collectors after desliming the ore( to remove clay, chert etc.) before milling
Laboratory/pilot stage techniques to separate apatite, carbonate minerals are known. These techniques [2] involve reverse flotation carrying carbonate minerals into the froth product using soap collectors while depressing apatite minerals either by phosphoric acid or by fluosilisic acid and the phosphate concentrate is recovered as chamber product
Schonert designed a size reduction equipment which is based on the principle of “crushing a mineral particle between other mineral particles instead of grinding elements”
Summary
Beneficiation of phosphate ores containing carbonate gangue minerals such as calcite and dolomite is one of the toughest problems before mineral process engineers, whereas phosphate ores with siliceous gangue (Florida, Senegal, Matoon ores) can be processed [1] by direct flotation of apatite minerals with soap collectors after desliming the ore( to remove clay, chert etc.) before milling. K. Schonert designed a size reduction equipment (commercial machines are popularly known as roller presses or High Pressure Grinding Rolls) which is based on the principle of “crushing a mineral particle between other mineral particles instead of grinding elements”. Schonert designed a size reduction equipment (commercial machines are popularly known as roller presses or High Pressure Grinding Rolls) which is based on the principle of “crushing a mineral particle between other mineral particles instead of grinding elements” This is achieved by choke feeding the roller press that has two rolls of which one is fixed and the other is sliding. Both rolls are driven by separate motors, and comminution pressure is hydraulically applied to the sliding roll These machines are highly energy efficient and are very successful in cement. The success of these machines in mineral processing industry (hard rock) is very limited mainly due to the wear problems of the grinding surfaces [5]
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