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。
This paper introduced the process of aerobic pretreatment process and the test results of anaerobic dry fermentation with crop straw as the main raw material.
介绍了以秸秆为主要原料的好氧预处理过程及厌氧干发酵工艺的试验结果。
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