A METHOD OR PURIFYING SULPHUR FROM ARSENIC, ACCORDING TO WHICH MOLTEN SULPHUR IS TREATED WITH CALCIUM OXIDE OR CALCIUM HYDROXIDE IN THE PRESENCE OF A SULPHUR IMMISCIBLE PHASE AN AQUEOUS SOLUTION OF INORGANIC SALTS, HAVING A BOILING POINT HIGHER THAN THE MELTING POINT OF SULPHUR, THE ANIONS OF SAID AQUEOUS SOLUTION FORMING SOLUBLE COMPOUNDS WITH CALCIUM, SAID SULFUR-IMMESCIBLE PHASE PREFERABLY WETTING ANY EXCESS SOLID CALCIUM OXIDE OR HYDROXIDE OR THE SOLID CALCIUM REACTION PRODUCT WITH ARSENIC. SAID METHOD OF PURIFYING SULPHUR OBVIATES THE FORMATION OF ARSENIFEROUS WASTE SOLUTIONS, PROVIDES FOR THE CONCENTRATION OF ARSENIC IN A SOLID, COMPACT, DUSTLESS PRODUCT WHICH IS CONVENIENT FOR TRANSPORTATION AND BURISL, AND REQUIRES CONVENTIONAL (NON-AUTOCLAVE) EQUIPMENT FOR ITS REALIZATION.