Steel ladle aluminum-magnesium refractory mortar capable of recycling refractory dust collection powder and preparation method thereof

The invention discloses steel ladle aluminum-magnesium refractory mortar capable of recycling refractory dust collection powder and a preparation method thereof. The steel ladle aluminum-magnesium refractory mortar is prepared from the following raw materials in percentage by mass: 5.0%-90.0% of refractory dust collection powder, 5.0%-30.0% of corundum fine particles with the particle size of 0.5-0.15 mm, 2.0%-20.0% of fused magnesia fine particles with the particle size of 0.5-0.15 mm, 1.0%-10.0% of corundum micro powder and/or alpha-type activated alumina micro powder, 0.5%-5.0% of silica micro powder, 0.1%-1.5% of a water reducing agent, 0.01%-1.0% of a plasticizer and 0.01%-1.0% of a preservative. The preparation method comprises the following steps: firstly, adding the refractory dust collection powder into a mixing mill, then adding the water reducing agent, the plasticizer and the preservative, uniformly mixing, then adding the other raw materials, continuously uniformly mixing, and discharging to obta