The inorganic chemicals with high purity and low cost directly from ores can be produced through the concentration, separation and purification of solvent extractions.

应用萃取富集、分离、提纯，可以由矿石直接生产金属无机盐，纯度高、成本低。

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Tannin fractions with different molecular weight distributions were obtained by purification of alcohol precipitation and fractionation of solvent extractions of black wattle bark tannins.

通过对黑荆树皮单宁进行醇沉纯化和溶剂萃取分级，可得到分子量分布范围不同的单宁级分。

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Advantages and disadvantages of several sorts of extractions were introduced. The development to palladium recovery with solvent extraction in the future was analyzed.

并对各种类型的萃取剂萃取钯的优缺点做了评述，指出了溶剂萃取法回收钯的发展前景。

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