Clinker is lumps or nodules, Usually 3, 25 mm in diameter, Produced by sintering limestone and alumino, Silicate clay during the cement kiln stage. Clinker is ground usually portland cement . A little gypsum is sometimes added. It may also be paired with other components active ingredients or chemical admixtures to produce granulated ground slag from blast, Pozzolana cement furnaces cement, Silica fume cement. Clinker, If stored in can be, Dry conditions kept for several months without appreciable loss of quality. Consequently and because it can be seamlessly handled by ordinary mineral handling equipment, Clinker is traded internationally in large quantities. Cement manufacturers purchasing clinker usually grind it as an supplement to their own clinker at their cement plants. Manufacturers also ship clinker to grinding plants in regions where cement, Making raw materials are not available.