▎ 摘　　要

NOVELTY - Refining agent comprises 3-6 pts. wt. modified graphene, 6-10 pts. wt. nano aluminum nitride, 2-4 pts. wt. titanium pigment, 1-3 pts. wt. ammonium fluoroborate, 0.8-1.6 pts. wt. epidesmine antibacterial powder, 0.4-0.8 pts. wt. alumina, 0.1-0.3 pts. wt. sulfur, 4-6 pts. wt. hydrogen type mordenite powder, and 0.1-0.3 pts. wt. magnesium aluminum silicate, where modified graphene is modified by using 2-hydroxypropyltrimethylammonium chloride chitosan as a modifier. USE - Refining agent for improving casting performance of waste aluminum. ADVANTAGE - The refining agent is capable of obtaining a high quality waste aluminum alloy melt, which reduces microporosity of casting and significantly increases the mechanical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing refining agent, which involves mixing the raw materials, and subjecting to ball milling for 6-10 minutes under a nitrogen atmosphere to a particle size of 200-600 mu m to obtain final product.