9GonzalezJ.A,Del,M,Ruiz,C. Bleaching ofkaolins and clays by chalorination of Iron and titanjum[J].Applied Clay Science,2006.219-229.
10Mandal,S.K,Banerjee,P.C. Iron leaching from China clay with oxalic acid:effect of different physicochemical parameters[J].International Journal of Mineral Processing,2004.263-270.