METHOD FOR PRODUCING REUSABLE GRANULATED MATERIAL FROM GYPSUM BOARD WASTE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a reusable granulated material from a gypsum board waste material where the generation of hydrogen sulfide is suppressed.SOLUTION: A method for producing a reusable granulated material from a gypsum board waste material comprises: a step to crush the gypsum board waste material; a step to remove a paper component from a crushed material; a step to add blast furnace slag cement type B, water and a predetermined additive to the crushed material where the paper component is removed and to agitate the mixture; and a step to produce the granulated material from the mixture. In the method, the reusable granulated material where the generation of hydrogen sulfide from the granulated material is suppressed is produced by adding an alkali to bring a pH value to 8 or higher and a reductive ferrous compound as the predetermined additive in the mixing step and being mixed under the condition that oxidation reduction potential becomes negative potential.