This paper has studied the copper leaching with sulphuric acid from low grade copper oxide mineral.

介绍了低品位氧化铜矿制备硫酸铜的工艺研究。

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Chemistry 4 Mineral acid cleaning and passivation can be performed for iron oxide removal or passivation.

化学作用4：可进行无机酸清洁和钝化以去除或钝化氧化铁。

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The paper introduces the research of mineral processing test of some low-grade copper oxide ore in Yunnan.

本文主要针对云南某地低品位氧化铜矿样进行了选矿试验研究。

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Inorganic or mineral-based UVA filters titanium dioxide and zinc oxide, which don't break down as easily in sunlight and generally are not allergenic, are better options, according to Lawrence Gibson, professor of dermatology at the Mayo clinic in Minnesota.

WSJ: European Sunscreen Roadblock on U.S. Beaches