公开(公告)号：EP2730667A4

公开(公告)日：2015-04-29

申请号：EP12852449

申请日：2012-07-16

申请人： TAM 5 S L

发明人： TAMARGO GARCÍA FRANCISO JOSÉ

IPC分类号： C22B19/20 ,  C22B1/02 ,  C22B3/00

CPC分类号： C01G9/02 ,  C22B19/02 ,  C22B19/22 ,  C22B19/26 ,  Y02P10/234

摘要： This method is based in the recirculation of an iron free solution or a solution with low iron content in such a manner that the final acidity conditions obtained are ideal for iron to efficiently precipitate as jarosite. In a variation of the invention the zinc concentrate is subjected to the following stages: a. Roasting of at least part of the zinc concentrate. b. Neutral leaching where zinc oxide is dissolved. c. Acid leaching where zinc ferrites are leached. d. Reduction of the Fe +++ contained in the solution to Fe ++ by adding zinc concentrate and diluting it with a zinc sulphate solution resulting from stage (f) to lower the concentration of Fe ++ . e. Neutralizing the acidity in the solution with calcine. h. Iron oxidation and jarosite precipitation, free of contaminating solids, by means of the injection of oxygen or oxygen-enriched air and the addition of an alkali or a Na + o NH4 + salt.