(JP5504326-W)      A strip acid regeneration process in a method for recycling contaminated sulphuric acid from lead-acid batteries comprises diluting the contaminated acid to 150-230 g/l, filtering to remove solids, oxidising any Fe (II) to Fe (III) and removing this by liq.-liq. extn. using a mixt. of a mono- or di-alkyl phosphoric acid and a 7-substd. 8-hydroxyquinoline or oil-soluble 2-hydroxybenzophenone oxime chelating agent. A modifier pref. tridecamol keeps these agents soluble and aids phase sepn. and there is a water-immiscible carrier.    The molar ratio of the quinoline and the phosphoric acid lies between 1:1-1:4, the ratio of the extn. agent to water-immiscible carrier exceeds 10:90 and extn. is performed at a vol. ratio between acid and extn. agent of from 4:1 to 1:4 and repeated until Fe is largely removed.    The prod. is filtered through a C filter to remove residual extn. agent, concn. H2SO4 added to increase the concn. of the recovered acid to that suitable for new batteries, with a Fe concn. not exceeding 20 ppm. The contaminants are removed from extn. agent by contacting with a strip acid having an acid concn. of 30-50%. The extn. agent is reused, Fe in the strip acid is reduced to Fe (II) and the acid used to remove contaminating Fe (III) from the extn. agent.    USE/ADVANTAGE -   A method for reclamation of expended Pb-acid battery.    (JP94060008-B2)      A strip acid regeneration process in a method for recycling contaminated sulphuric acid for lead-acid batteries comprises diluting the contaminated acid to 150-230 g/l, filtering to remove solids, oxidising any Fe(II) to Fe(III) and removing this by liq.-liq. extn. using a mixt. of a mono- or di-alkyl phosphoric acid and a 7-substd. 8-hydroxy-quinoline or oil-soluble 2-hydroxy-benzophenone-oxime chelating agent. A modifier keeps these agents soluble and aids phase sepn. and there is a water-immiscible carrier.    The molar ratio of the quinoline and the phosphoric acid lies between 1:1 and 1:4, the ratio of the extn. agent to water-immiscible carrier exceeds 10:90 and extn. is performed at a vol. ratio between acid and extn. agent of from 4:1 to 1:4 and repeated until Fe is largely removed.    The prod. is filtered to remove residual extn. agent, conc. H2SO4 added to increase the concn. of the recovered acid to that suitable for new batteries, the Fe concn. - not exceeding 20 ppm, and the contaminants removed from the extn. agent with a strip acid having a concn. of 30-50%. The extn. agent is reused, Fe in the strip acid is reduced to Fe(II) and the acid used to remove -.contaminating Fe(III) from the extn. agent.    Also claimed is a method as above in which the Fe(III) to Fe(II) redn. is brought about by passing the strip acid through a cell (10) with sepd. anode (24) and cathode (19) compartments and applying electric current to reduce the Fe(III) in the cathode compartment.    USE/ADVANTAGE -   A method for the reclamation of expended Pb-acid battery.    (EP506741-B1)      A strip acid regeneration process in a method for recycling contaminated sulphuric acid for lead-acid batteries comprises diluting the contaminated acid to 150-230 gl-1, filtering to remove solids, oxidising any Fe(II) to Fe(III) and removing this by liq.-liq. extn. using a mixt. of a mono- or di-alkyl phosphoric acid and a 7-substd.8-hydroxyquinoline or oil-soluble 2-hydroxybenzophenoneoxime chelating agent. A modifier keeps these agents soluble and aids phase sepn. and there is a water-immiscible carrier.    The molar ratio of the quinoline and the phosphoric acid lies between 1:1 and 1:4, the ratio of the extn. agent to water-immiscible carrier exceeds 10:90 and extn. is performed at a vol. ratio between acid and extn. agent of from 4:1 to 1:4 and repeated until Fe is largely removed.    The prod. is filtered to remove residual extn. agent, conc. H2SO4 added to increase the concn. of the recovered acid to that suitable for new batteries, the Fe concn. - not exceeding 20 ppm, and the contaminants removed from the extn. agent with a strip acid having a concn. of 30-50%. The extn. agent is reused, Fe in the strip acid is reduced to Fe(II) and the acid used to remove -.contaminating Fe(III) from the extn. agent.    Also claimed is a method as above in which the Fe(III) to Fe(II) redn. is brought about by passing the strip acid through a cell (10) with sepd. anode (24) and cathode (19) compartments and applying electric current to reduce the Fe(III) in the cathode compartment.    USE/ADVANTAGE -   A method for the reclamation of expended Pb-acid battery.