a steam entrainment column 35 steam is introduced at 36 into this column and entrains the organic solvent load present in the aqueous phase the organic solvent entrained by steam is recycled into the extraction column 17 through the pipe 37 the aqueous solution of cacl 2 which may possibly still be treated in order to eliminate a few heavy metal impurities from it can in its turn be discharged at 40 as can be seen only some of the cacl 2 resulting from the introduction of hcl in the method must be treated by a steam entrainment which greatly reduces the energy cost compared with the methods which effect a liquid liquid extraction directly on the liquid phase separated from the liquor resulting from the hydrochloric attack the invention will now be described in more detail by means of example embodiments given non limitingly phosphate ore of moroccan origin which has a p 2 o 5 content of 33 and a total cao content of 50 cao representing all the ca available in the ore as ca 3 po 4 2 caco 3 cao and other ca compounds is fed at a rate of 15 kg h into a stirred reactor in order.