TITLE:
Research on Dihydrate Calcium Sulphate Crystallization during the Production of Phosphoric Acid by Wet Process
AUTHORS:
Huirong Du, Anyin Chen, Li Yang
KEYWORDS:
Calcium Sulfate, Active Additives, Crystal Seed, Crystallization
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.2 No.12,
December
10,
2014
ABSTRACT: Simulate the production of phosphoric acid by wet process is conducted in batch experiments facilities
by adopting phosphorus concentrate as raw material from Wengfu, Dazhou city, with a
view to study sulfuric acid concentration, reaction time, crystallization temperature of calcium
sulfate, active additive, the influence of seed crystal on the size and shape of calcium sulfate crystal
under conditions of Wet process phosphoric acid productive process. The research results show
that under the conditions of the liquid-solid ratio of 4:1, the sulfate acid stoichiometric ratio of 1.1,
phosphoric acid mass fraction of 21%, the crystallization temperature of 75°C, crystallization time
of 120 min, when (NH4)2SO4 taken as active additives, Mg-doped calcium sulphate crystal as crystal
seed can obtain rodlike crystallization of stability, thickness, uniformity.