In flotation process, the harm of excessive reagent is often ignored. Practical experience has proved that the decline of flotation index is caused by excessive flotation reagents in many cases. The harm of excessive flotation reagents mainly includes the following aspects

The company has been allowed to resume operations at a mine in northern Brazil, another step towards regaining the title of the world's largest iron ore producer. The Rio de Janeiro based company said in a statement on Friday that environmental authorities have granted vale the licenses needed to restart and expand the Serra Leste mine in Parra state, which have been suspended since January 2019;