The major factors of affecting extraction and back-extraction were discussed. The better technological conditions were obtained.

分析了影响萃取及反萃取取的因素，获得了较佳工艺条件。

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Calcium magnesium acetate (CMA) can be prepared by extraction of acetic acid from dilute acetic acid wastewater using trioctylamine and then by back extraction using dolomite lime.

用三辛胺萃取醋酸废水中的醋酸，加入白云石灰乳反萃，可制得环保型除冰剂醋酸钙镁盐(CMA)。

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Results show that the mixed solvent can give high distribution extraction rate for acetic acid wastewater. Back extraction rate was 98. 4%.

试验结果表明：混合溶剂对废水中的醋酸有较高的萃取率，反萃取效果为98.4%。

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It has put in place a rehabilitation program that aims to reshape the dunes and bring the forest to its pre-mining state by putting the indigenous plants back into the ground after the extraction process.

CNN: South Africa dune mining whips up sandstorm