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。
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.
经x -衍射分析粉煤灰中的含铁矿物主要是以赤铁矿和磁铁矿的状态存在，少量以磁赤铁矿、镁铁尖晶石以及镁铝铁氧化物的固熔体形式存在。
The X-diffraction analysis of fly ash showed that iron minerals were mainly hematite and magnetite, small amount of magnetic hematite, Mg-Fe spinel and Mg-Fe-Al oxide solid solution.
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