introduction gypsum industry - Strzelnica-Starachowice
May 04, 2018· Gypsum is a naturally occurring rock, a metallic salt of calcium. It commonly forms as an evaporite from the dissolution of limestone by exposure to sulphuric acid from volcanic activity. Under certain conditions such as low-lying lagoons, continual cycles of dissolution and evaporation will agglomerate a "primary" deposit of gypsum.