method of mean gradation

The recent technology progress and existed problems for the production of feed-grade calcium hydrogen phosphate by two-stage neutralization method in China are analysed.

分析了近年来中国两段中和法生产饲料磷酸氢钙工艺路线的进展及存在的问题。

Now the traditional two-step neutralization method is adopted by most domestic enterprised for producing feedstuff-grade calcium hydrophosphate.

目前国内外大部分企业采用传统的二段中和法生产饲料级磷酸氢钙,粗磷酸首先采用石灰乳一段中和脱氟,然后再用分离后的净化磷酸二段中和生产饲料级磷酸氢钙。

Linear density of viscose staple fiber is tested by cut-middles method and vibration method.

采用中段称重法、振动法测试黏胶短纤维的线密度,并分别对其进行测量不确定度的评定,给出了评定过程及带有不确定度的完整测试结果;并通过评定测量不确定度来分析影响测量结果的主要因素,对比分析了这两种常用的测试方法,得出两者优缺点及适用场合。