separate any suspended impurities flowing with the rising air bubbles the separated impurities fall downwardly and settle at the bottom 102 of the column 100 as shown in fig7 four equally radially spaced braces 182 extend between a pipe support 180 for receiving the feed tube 66 and the first baffle 160 four equally radially spaced braces 184 extend between the first baffle 160 and the second baffle 170 and four equally radially spaced braces 186 extend between the second baffle 170 and the top 106 of the sidewall 104 of the column 100 with particular reference to fig7 there is seen from the inside to the outside the following components the pipe support 180 the feed well 140 the feed well baffle 188 the first baffle 160 the second baffle 170 the top 106 of the sidewall 104 of the column 100 and finally the top 124 of the sidewall 126 of the launder 120 baffles 160 and 170 aid in the further reduction of turbulence in column 100 and separation of impurities b from the phosphate c c then spills out of the top 106 of the column 100 into the launder 120 for collection it is possible to have one or more baffles depending on the dimensions of the column in order to maintain the column 100.