不溶性氧化物相留存在残渣中。

The insoluble lead oxide is remained in the residue.

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钢材表面应无可见的油脂和污物，并且没有附着不牢的氧化皮、铁锈和油漆涂层及其它杂质（水溶性盐和焊接残渣）。

Steel surface should be no visible grease and dirt, and there is no attachment not firm scale, rust, paint and other impurities (water soluble salt and welding residue).

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上述残渣分别在碱液和酸液中浸提、抽滤、清水洗至中性，干燥后得到水不溶性膳食纤维产品。

The water insoluble dietary fiber is obtained by leaching the residue in alkali solution and acid solution respectively, suction filtering, water washing to neutral, drying.

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