以下为句子列表：
英文: The quality is a burnt magnesia spinel brick made from fused magnesia， low iron sintered magnesia and fused hercynite.This synthetic hercynite is a patent by RHI Refractories.
中文: 它由电熔镁砂、低铁烧结镁砂和电熔铁铝尖晶石制成的烧结镁铁尖晶石砖，这种人工合成的铁铝尖晶石是RHI奥镁公司的专利。
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