| http://www.w3.org/ns/prov#value | - FIG. 2 is a graph on which the relationship between the i values, as hereinafter defined, of Mn0 and the regeneration temperatures is plotted; and FIG. 3 is a graph on which the relationship between the ivalues of the manganese oxide and the excess amount of ammonia for converting the manganese sulfate to manganese oxide and ammonium sulfate is plotted.
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