And the iron contents of the iron extractive mines prepared from the magnetic substances were respectively 62.01 % ( Longganghu Vitriol Plant ) and 67.81 % ( Zhuzhou Chemical Plant ) .

由该磁性物质制备的铁精矿，其含铁量分别为62.01%（龙感湖 硫酸 厂）和67.81%（株洲化工厂）。

Analysis of Auto Control on Feeding Vitriol in Water Treatment Plant

净 水厂加 矾自动控制分析