Process for the conversion of dolomite

Claim 1

A PROCESS OF CONVERTING SLAKED DOLOMIT INTO MG(OH)2 BY EMPLOYING AN INITIAL MAGNESIUM BRINE SUBSTATIALLY SATURATED IN NAC1 AND CONTAINING, IN ADDITION TO CHLORIDES, A SUBSTANTIAL PROPORTION OF SULPHATE, WHICH COMPRISES MIXING WITH SAID INITIAL BRINE A SUFFICIENT QUANTITY OF A RECYCLED CONCENTRATED BRINE RICH IN CAC12 THAN SAID INTIAL BRINE TO THEREBY CAUSE THE SUPERSATURATION OF CALCIUM SULPHATE WITHOUT LOWERING THE NAC1 CONTENT OF THE MIXTURE AND CRYSTALLIZE A GREAT PART OF THE CASO4 IN THE FORM OF GYPSUM FROM ITS MOTHER LIQUOR, MIX STEP, REMOVING THE GYPSUM FROM ITS MOTHER LIQUOR, MIXING MAGNESIUM BRINE MOTHER LIQUOR FROM SAID DESULPHATING STEP WITH SLAKED DOLOMITE IN A FIRST CONVERTING STEP TO PARTIALLY CONVERT IN CONCENTRATED MEDIUM THE DOLOMITE INTO MG(OH)2 AND PRODUCE A CONVERTING BRINE RICHER IN CAC12 THAN SAID MOTHER LIQUOR,UTILIZING THE CONSENTRATED BRINE PRODUCTED IN SAID FIRST CONVERTING STEP AS THE RECYCLED BRINE WHICH IS MIXED WITH SAID INITIAL BRINE, REMOVING THE PARTIALLY CONVERTED DOLOMITE FROM SAID FIRST CONVERTING STEP AND CARRYING ON THE CONVERSION IN A SECOND CONVERTING STEP BY MIXING IT WITH MAGNESIUM-CONTAINING BRIN WHICH IS MORE DILUTE THAN SAID MOTHER LIQUOR AND IS OBTAINED BY DILUTING MOTHER LIQUOR FROM SAID DESULPHATING STEP WITH WATER IN ORDER TO INCREASE THE SOLUBILITY OF THE CASO4 STILL PRESENT IN THE MEDIUM AND AVOID ITS PRECIPITATION, AND TO OBTAIN FINALLY A MAGNESIUM HYDROXIDE WITH A VERY SMALL AMOUNT OF CASO4.