Magnesia alumina spinel refractory ball

The present invention relates to a magnalium spinel flame-resisting ball, which has the following component and weight ratio: 58 to 62% of aggregate common burned magnesia, 30 to 32% of packing material middle-grade magnesia, and 8 to 10% of high bauxite, wherein the common burned magnesia contains more than or equal to 91% magnesia with density of 3.0g/cc, the middle-grade magnesia contains more than or equal to 95% of magnesia with density of 3.2g/cc, the high bauxite contains more than or equal to 85% of magnesia with density of 3.0g/cc. The flame-resisting ball provided by the invention has good heat storage performance, the bulk density reaches 2.8g/cc, the strength is bigger than 19 thousand N each, and it is uneasy to be broken up and form slag, as a result, air duct blocking is avoided and heat utilization efficiency is improved.