METHOD OF USING HIGH CONCENTRATION SULFURIC ACID FOR STRIPPING AND PRECIPITATION OF ADSORBED MAGNESIUM

摘要

METHOD OF USING HIGH CONCENTRATIONSULFURIC ACID FOR STRIPPING ANDPRECIPITATION OF ADSORBED MAGNESIUMABSTRACTAdsorbed magnesium is removed from a cationexchange resin by elution with 20 to 70% sulfuric acid asincrements of the loaded resin move upwardly in a strippingcolumn, the regenerated resin being removed at the top ofthe column and the sulfuric acid of reduced concentrationwith the eluted magnesium is removed from the lower portionof the column. The sulfuric acid concentrations arecontrolled so that the regenerating solution can be formedfrom commercial concentrations of sulfuric acid withoutundue dilution, and so that the magnesium can be precipitatedfrom the eluting solution by increasing the sulfuric acidconcentration without adding a large amount of commercialconcentration acid. The amount of dilute sulfuric acidproduced as a waste material is kept to a minimum, whilethe prinicpal sulfuric acid by-product has a usefully highconcentration, such as may be employed for treatment ofphosphate rock.