preconcentration

基本解释

The composition, work principle as well as measurement and control system of a new X-ray separator for ore preconcentration are presented.
介绍了新型矿石预选设备X射-线分选机的组成、工作原理及其测量操作系统。
Effect of the preconcentration technology on the development economic benefits of the deposit is discussed in this paper based on the technological and economic analysis.
在技术经济初步分析的基础上探讨了预选工艺对某银铅锌矿开发效益的影响。
The lean magnetite ore can be turned into one that has utilization value by wet preconcentration by magnetic separation after fine crushing to discard most of qualified waste.
通过采取细碎后湿式磁选预选方法，抛除掉大部分合格废石后，可以将该贫磁铁矿变成为具有开发利用价值的矿物。

分离富集
For that the separation and preconcentration of the samples before the analyce is requisite.
因此,对待测样品进行分离富集预处理是不可缺少的重要环节。
预富集
The method provided good reproducibility in terms of both migration time and peak height. It can be successfully used for the preconcentration zwitterion.
这种方法有很好的重现性,能够成功地用于两性离子的预富集。
预浓集
The latter has been packed into the micro-columns, which was used in the FI-AA systems; on-line preconcentration and separation of precious metals have been achieved.
将后者填充于FI-AA联用的微型柱内，实现了贵金属的自动在线预浓集与测定。
浓缩