为提高防老剂BHT的纯度，采用重结晶和区域熔融法对工业品防老剂BHT进行提纯。
In order to improve the purity of industrial product, Antioxidant BHT was purified by the methods of recrystalize and zone melting.
成矿机理是：区域板块运动使本区在侏罗纪末下地壳形成花岗岩浆熔融层。
The metallogenic mechanism is as follows: in the latest Jurassic, the melting layers of granite magma in the lower crust were formed by the regional plate movement.
主要有溶剂萃取、离子交换、真空熔融、真空蒸馏或升华、电迁移以及区域熔炼等。
There are solvent extraction, ion exchange, vacuum melting, vacuum distillation or sublimation, electro migration and regional melting, etc.
主要有溶剂萃取、离子交换、真空熔融、真空蒸馏或升华、电迁移以及区域熔炼等。
There are solvent extraction, ion exchange, vacuum melting, vacuum distillation or sublimation, electro migration and regional melting, etc.
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