METHOD OF MANUFACTURE AND ENVIRONMENT-FRIENDLY QUARRY LANDFILL FILLER OF OCCURRED IN THE CIRCULATING FLUIDIZED BED BOILER USING GAS DESULFURIZATION GYPSUM

摘要

The present invention relates to an environment-friendly filler to be embedded in a quarry site using a desulfurized gypsum generated in a circulating fluidized bed boiler and a manufacturing method thereof and, more specifically, to an environment-friendly filler to be embedded in a quarry site in which a desulfurized gypsum generated after petroleum cokes are used in a circulating fluidized bed boiler, a mixture for concrete, and a bonding material are mixed and to a manufacturing method thereof. The desulfurized gypsum generated in the circulating fluidized bed boiler using petroleum cokes contains anhydrite (CaSO_4) and calcium oxide (CaO). Thus, recycling the desulfurized gypsum is limited. According to the present invention, to stabilize the calcium oxide contained in the desulfurized gypsum and to apply a pressing method, excellent strength expression properties are obtained by mixing the calcium oxide with water in case of agitation, determining time to form a section wherein the highest temperature generated in case of agitation decreases, and increasing hydrates and densifying a fine porous structure through a steam curing process. Calcium hydroxide (Ca(OH)_2) generated by a reaction of the calcium oxide and water in an accelerated carbonation process is reacted with carbon oxide (CO_2) rapidly penetrated through the accelerated carbonation process so that calcium carbonate (CaCO_3) is generated and calcium carbonate densifies the fine structure. Thus, pH is a little bit reduced and strength is increased. In addition, (a) leachate obtained by an acidic water-soaking process creates an effect of the environment-friendly filler to be embedded in a quarry site of which pH is 9 or less and which is harmless to vegetation.