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High-Performance Lightweight castable used in ladle were prepared by introducing fused magnesia powder and microsilica as the matrix.The effects of magnesia powder and microsilica content on properties of lightweight castable were investigated.It was found that the appropriate magnesia powder and microsilica content were respectively determined as 16 wt% and 4 wt%, which reached to lower volume density, smaller permanent linear change, good strength and better thermal expansion performance.