technical review
7.Abstract: A review for improvement and current situation about the dressing,metallurgy of platinum ores,a technical line and principal principle of treating the mineral intergrowth,technical index of floatation concentration,technical problems and troubles of treating the floatation concentrate by the hydrometallurgy.
10.Review is made on the results of two designs for the high pressure pregrouting at the stopes of the main shaft and the auxiliary shaft in an iron mine.One design took the geological characteristics as the basis and was strictly and scientifically made.With proper construction technical measures,it brough both good technical and economical effects to the grouting engineering.The another design was made in no consideration of practice.As a result,it brought avoidable losses to the engineering.Its failure cause are analyzed.

