The pretreatment of the raw material by magnetic separation to prepare the qualified ultrapure iron concentrate for producing permanently magnetic ferrite is described.
介绍了磁选方法预处理原料，制备适合于永磁铁氧体生产的合格超纯铁精矿。
It was studied that technique conditions in cattle placenta processing by proteinase, including suitable enzyme types, hydrolytic time, hydrolytic temperature and pretreatment methods of raw material.
研究了酶法加工牛胎盘时酶的选择、水解时间、水解温度及原料的预处理等工艺条件。
The pineapple produced in Zhanjiang as the raw material and the single factor tests and orthogonal test were used to study the effects of enzyme pretreatment on extraction rate of pineapple juice.
采用正交试验法研究了果胶酶和纤维素酶的酶用量、酶比例、酶解温度以及酶解时间对菠萝果汁提取率的影响。
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