(57) The present invention is a low-temperature calcined cement clinker comprising Iimit and calcium silicate, the cement clincher is a low-grade limestone having a CaO content of 44 to 47% by weight as a source, a fluidized bed boiler fly ash, bituminous coal flue gas desulfurization gypsum and alumina a raw material composition containing process sludge is pulverized to obtain a pulverized product, and a low-carbon low-temperature calcined cement clinker, which is a product obtained by sintering the pulverized product at 1250 to 1350°C, and a method for producing the same. The low-carbon low-temperature sintering cement clinker of the present invention has a low sintering temperature compared to the conventional Portland cement clinker, so that the amount of carbon dioxide generated during manufacture is small and has excellent greenhouse gas reduction effect. In addition, depending on the use, such a cement clinker is pulverized to 2500 to 4500 cm2/g or mixed and pulverized with anhydrite, slaked lime, etc., depending on the purpose, alone or mixed with Portland cement at 5 to 70% by weight. If so, functions such as expandability, fast setting and high strength can be given to cement concrete.
(71) Acmtech Inc (KR)