principal scale
3.It describes mainly the mineral composition of scale, scale formation mechanism and recent principal research progress in this research sphere, points out that the thorough research on main minerals in the scale and behaviors of main impurities in bauxite in the Bayer process system will be helpful for the research on scale formation regularity and method for scale prevention and concludes that to develop a new type additive is one of the effective methods for slowing down scale formation in the Bayer process.
5.Dagangshan hydroelectric power station is a large-scale hydroelectric power station of principal Dadu River developed recently. Its dam height is about 210m,reservoir storage is about 7.42 × 10~8 m~3 equipped capacitor is 240MW.

