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In this study, we investigat ed the possible use of a new inorganic mate rial as alternative filler in the paper industry. The inorganic material is a mineral composed of calcium sulfate, that is generated when manu-facturing phosphate fertilizer. The inorganic materi al was dehydrated by the thermal treatment to 200 ℃, 500℃, 700 ℃, and 900 ℃ to prepare white filler powders. Their basi c properties, including color, particle shape, elements, and average particle size were identified. To determine the effect of new inorganic filler on paper's physical properties and strength, handsheet s were prepared from HwBKP, SwBKP, and ther-mal treated inorganic fillers. Handsheets' ISO brightness, opacity, bulk, breaking length, and stiffness were measured. Results confirmed that thermal treated inorganic filler could be beneficial to the bulk and opacity of paper while maintaining higher level of breaking length and stiffness that is achieved using talc. Keywords : phosphate fertilizer, calcium sulfate, inorganic filler, thermal treatment, color

Study on the Application of Inorganic Byproduct from Fertilizer Manufacture Process as an Alternative Filler