Process for producing dry magnesium chloride from solutions containing it

Claim 1

A PROCESS FOR THE PRODUCTION OF A MAGNESIUM CHLORIDE-CONTAINING SALT MIXTURE SUBSTANTIALLY FREE OF WATER AND OXIDE FROM AN AQUEOUS MAGNESIUM CHLORIDE-CONTAINING SOLUTION WHICH COMPRISES A FIRST EVAPORATING STEP OF EVAPORATING SUBSTANIALLY ALL WATER FROM THE MAGNESIUM CHLORIDE-CONTAINING SOLUTION TO FORM A SUBSTANTIALLY DRY, FINE-GRAINED PRODUCT BY DIRECT CONTACT HEATING THE SOLUTION WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HEATED AIR AND GAS, FLASH FLOW-DRYING THE SUBSTANTIALLY DRY, FINE-GRAINED PRODUCT TO REMOVE THE REMAINING WATER BY CONTACTING SAID PRODUCT WITH HEAED AIR IN SUCH A MANNER THAT NOT MORE THAN A 40 PERCENT TEMPERATURE DECREASE IN DEGREES CENTIGRADE OCCURS IN THE HEATED AIR DURING SUCH CONTACT AND NOT MORE THAN A LOW DEGREE OF MOISTURE SATURATION REMAINS IN SAID HEATED AIR TO AVOID NOTEWORTHY HYDROLYSIS OF THE MAGNESIUM CHLORIDE AND PASSING THE HEATED AIR AFTER CONTACT TO FIRST EVAPORATING STEP.