Oxidative decolorization method for remelt syrup of brown granulated sugar by using lime clarification method combined with chlorine dioxide

The invention relates to an oxidative decolorization method for remelt syrup of brown granulated sugar by using a lime clarification method combined with chlorine dioxide. The method comprises the following steps: preliming; primarily heating; secondarily liming; secondarily heating; flocculating and settling and carrying out oxidative decolorization, wherein oxidative decolorization specifically comprises the following steps: taking supernate and adding an oxidizing agent ClO2 for oxidative decolorization of the supernate, the addition of ClO2 is 700-900mg/1kg of supernate, the initial pH value of oxidizing reaction is 6.4-6.6, the temperature of oxidizing reaction is 40-50 DEG C and the time of oxidizing reaction is 30-45 minutes. Experiments show that the oxidative decolorization method for remelt syrup of brown granulated sugar by using the lime clarification method combined with chlorine dioxide provided by the invention is feasible. The decoloring effect is superior to the clarifying and decoloring effect by directly adding chlorine dioxide into the remelt syrup of brown granulated sugar, and the use level of chlorine dioxide is greatly reduced. The method provided by the invention has the advantages of simplicity, efficiency, small use level of the oxidizing agent, low cost, greenness and environmental friendliness and the like and has a relatively good application prospect in clarifying and decoloring the remelt syrup of brown granulated sugar.