采用正交试验的方法，研究了在无机盐催化剂作用下苯酚双氧水直接氧化制取邻、对苯二酚的合成技术。

Using the orthogonal test , the synthesis of pyrocatechol and hydroquinone by catalytic oxidation of phenol by inorganic salts has studied.

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利用罐式法直接还原原理在试验室进行了氧化铁鳞制取直接还原铁的研究。

By retort mechanism of direct reduction, the preparation direct reduction iron with scale oxide is studied in the laboratory.

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通过试验研究，提出了利用难处理矿石的热压氧化预处理的原有体系直接进行氰化提金的新工艺。

This paper makes use the original system of pretreating refractory ore by hot-press oxidation to extract gold by cyanide process.

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