Gypsum Calcining Metallurgist Mineral Processing Engineer
The pulverized Gypsum was calcined in a vessel of some type, likely ceramic. The resulting product, eventually many hundred of years later, named Plaster of Paris, provided this early man with a medium for making cast objects. In the grinding stage the fineness most generally is turned out at 9093% minus 100 mesh with a 325 mesh range of 30 to ...