Special hemihidratos Alpha and beta Calcium sulfate, Procedure of obtaining from Gypsum ore without requirement of humid atmosphere or additives

摘要

This Invention is based on obtaining a special hemidrato Alpha presents an optimum Curing time, from Gypsum mineral (CA, SO4. 2H2O) through a process of dehydration of around 15% (W / W), which are mixtures of portions of the mineral with a proper proportion of SO3, Cao, CaSO4.H2O and 2H2O Crystallization to a Mineral with a Purity Of = 85% and SO3 content of = 38% and below, this final mixture is subjected to a process of cooking in a pan to atmospheric pressure (10 degrees to 145 deg C to obtain the Alpha without requiring a humid atmosphere or Previous or subsequent addition of Additives and 155 deg C to 200 deg C to obtain the beta.The Invention protects the products, as well as the process of obtaining it.