▎ 摘　　要

NOVELTY - Treating waste water in graphene production process involves oxidizing graphite prepared by a modified Hummers process and formulating the dispersion liquid or preparing the graphite oxide dispersion liquid by the modified Hummers method. The dispersion liquid is transferred to the purification equipment and filtered. The oxidized graphite colloid is washed to reach the purified target pH value to obtain the purified graphite oxide and the acidic waste water A produced in the purification process. The acidic wastewater A is concentrated in the reactor. USE - Method for treating waste water in graphene production process (claimed). ADVANTAGE - The method enables to treat waste water in graphene production process in cost effective manner and the product avoids industrial waste water discharge, obtains high value by-products and promotes large-scale industrial production of graphene. DETAILED DESCRIPTION - Treating waste water in graphene production process involves oxidizing graphite prepared by a modified Hummers process and formulating the dispersion liquid or preparing the graphite oxide dispersion liquid by the modified Hummers method. The dispersion liquid is transferred to the purification equipment and filtered. The oxidized graphite colloid is washed to reach the purified target pH value to obtain the purified graphite oxide and the acidic waste water A produced in the purification process. The acidic wastewater A is concentrated in the reactor, then alkaline substance is added to the waste water under stirring conditions and controlled temperature condition of the system until the pH of the system reaches the target pH value. The wastewater is subjected to solid-liquid separation to obtain manganese byproduct and waste water B. The waste water B is concentrated to obtain deionized water and concentrated brine C. The concentrated brine C is subjected to multi-effect evaporation to obtain potassium sulfate product.