Technology Research For Producting Sandy Alumina By Using Gibbsite's Low Temperature Dissolution Process

Bayer method of the Corporation of ShanDong Aluminum properties import gibbsite, It adopts low-temperature dissolution process. In this latter the seeded precipitation continuously optimize, try to improve the rate of sandy alumina. First, in the laboratory through comparing to real aluminum hydroxide and seeding aluminum hydroxide,seeking better seed types. Secondly in the continuous seeded precipitation and the discontinuous seeded precipitation, organizes a series of enlargement test, seek more suitable technology conditions for the industrial production.This topic adopts a series of measures to direct production.By using electronic microscope observe aluminum hydroxide form.By using laser particle size analyzer detects aluminum hydroxide crystal size distribution.Through a series of process optimization and improve efficiency of hydrocyclone classifier, optimizing auxiliary efficiency, simulative one flow method and two flow method Changes each other for timely,lay the foundation.By adjusting the temperature and solids content of aluminum hydroxide serous fluid, including the duration of the process conditions, summarized the rule of aluminum hydroxide particle changeing. By adjusting the temperature of aluminum hydroxide serous fluid, including solids content and the duration of the process conditions, summarized the rule of aluminum hydroxide particle changeing.while analysising the relationship between the aluminum hydroxide seed of particle size distribution and aluminum hydroxide particle.summarized the process technology system of strengthening agglomeration and nucleation, and formed a set of mature seeded precipitation technique.