区域熔融 meaning in Chinese

zone fusion
zone melting
zonemelting

Zone melting without crucible
无坩埚区域熔融
This paper is mainly concerned about how to purify the industrial products of the antioxidant d and bht , how to determine their purities , determining their purities and the purities need to be more than 99 % . in order to attain this objective , the recrystalizing method is used to purify antioxidant d and antioxidant bht . the methods of high performance liquid chromatography ( hplc ) is used to determine the chemical composition of the antioxidant d and bht , it is qualitative analysis
本论文是以防老剂d与bht工业品为主要原料制备防老剂d与bht标准物质，首先进行了防老剂d与bht的提纯和熔点的测定试验，并通过实验确定了防老剂d与bht重结晶提纯工艺；然后设计区域熔融装置，拟定操作规程和技术条件，通过用区域熔融法提纯重结晶后的防老剂d和bht产品满足标准物质的纯度要求。