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Electric fused sand and electric fused magnesia are different materials.

1. Electric fused sand is a high-purity silicon sand, mainly composed of silicon dioxide (SiO2), which is an important raw material in high-tech fields such as semiconductor materials, optical glass, and electronic materials.

2. Electric fused magnesia is a magnesia material mainly composed of magnesium oxide (MgO), which has high temperature fire resistance and can be used in the manufacturing of refractory materials, high-temperature insulation materials, metallurgical industry, and other fields.