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Processing the waste paper produces huge amounts of waste - papermaking sludge. This kind of waste includes around 50 % of inorganic material and high proportion of water. Its current economic recovery is very limited, which affects the overall efficiency of recycling paper. However, the elementary and chemical composition has a high potential for wider and more economically efficient use in various industrial fields. The object of this paper is research of composition and physical properties of such sludge from o...