preconcentration

基本解釋

The composition, work principle as well as measurement and control system of a new X-ray separator for ore preconcentration are presented.
介紹了新型礦石預選設備X射-線分選機的組成、工作原理及其測量操作系統(tǒng)。
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.
在技術經(jīng)濟初步分析的基礎上探討了預選工藝對某銀鉛鋅礦開發(fā)效益的影響。
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.
通過采取細碎后濕式磁選預選方法，拋除掉大部分合格廢石后，可以將該貧磁鐵礦變成為具有開發(fā)利用價值的礦物。

分離富集
For that the separation and preconcentration of the samples before the analyce is requisite.
因此,對待測樣品進行分離富集預處理是不可缺少的重要環(huán)節(jié)。
預富集
The method provided good reproducibility in terms of both migration time and peak height. It can be successfully used for the preconcentration zwitterion.
這種方法有很好的重現(xiàn)性,能夠成功地用于兩性離子的預富集。
預濃集
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.
將后者填充于FI-AA聯(lián)用的微型柱內，實現(xiàn)了貴金屬的自動在線預濃集與測定。
濃縮