FLOTATION PROCESS FOR IMPROVING RECOVERY OF PHOSPHATES FROM ORES

摘要

d-5850A FLOTATION PROCESS FOR IMPROVING RECOVERY OFPHOSPHATES FROM ORESABSTRACT OF THE DISCLOSUREA flotation process is provided for beneficiating phos-phate ores in at least two floats after conditioning with 0.4-1.5pound per ton of fuel oil and adding 0.025-0.1 pound per ton ofa frother and 0.2-0.5 pound per ton of a polyamine cationiccollector to remove silica in the froth (tails) and obtain 75-84%recoveries of phosphate in the concentrate (sink) which containsno more than about 6% insol. For some ores, the floats can bemade on each fraction, after desliming thereof, which are obtainedby screening over a 35 mesh screen. For other ores, desliming anda rougher flotation are initially needed. The silica froths(rougher tails) from this float are then cleaned and recleaned inseparate floats, without additional conditioning or addition ofcollector to produce tails which are discarded and a combined sinkwhich is screened over a 48 mesh screen to produce a +48 meshfraction which is discarded and a -48 mesh fraction which isconcentrate (product). Depending upon the ore, the sink from thefirst float is directly usable as product or is screened over a35 mesh screen to produce a -35 mesh concentrate (product) and a+35 mesh fraction which is conditioned with fuel oil, treated witha frother and collector, and floated to produce a tails, which isdiscarded, and a third concentrate as product.