采用磁选分离法+稀酸浸泡法联合处理后，使该地石英砂的化学成分达到了优质的生产平板玻璃用硅质原料的国家标准。
The chemical contents in the sand quartz has reached national standards of silicon raw material for plate glass production after combined treating by magnetic separation plus diluted acid dipping.
铁铝榴石呈红褐色，菱形十二面体晶形，化学成分以铁、铝、硅为主，含钙、镁等微量元素。
Almandine being red-brown rhombododecahedron consists of iron, aluminium and silicon, containing trace elements of calcium and magnesium.
评述了铝硅活塞合金的种类，化学成分，晶粒细化，变质处理，合金化和热处理工艺等优化手段。
It reviews the optimization measures of Al-Si piston alloy, including kinds, chemical composition, grain refinement, modification, alloying and heat treatment.
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