Steps in the modern dry-process manufacture of Portland cement (Continued)3. Burning changes raw mix chemically into clinker. Note four stage preheater, flash furnaces, and shorter kiln.
Combustion Limestone + Heat = CaO + CO2 (0.50 tons) Fuel Contribution = CO2 (0.50 tons) Total CO2 Contribution of 1 ton per clinker tonContribution of CO2 emissions duringPortland clinker production.
Clinker & Gypsum Clinker GypsumPortland cement clinker is formed by burning calcium and siliceous rawmaterials in a kiln. This particular clinker is about 20 mm (3¼ - 4 in.) indiameter.Gypsum, a source of sulfate, is interground with Portland clinker to formPortland cement. It helps control setting, drying shrinkage properties, andstrength development.
Steps in the modern dry-process manufacture of Portland cement (Continued)4. Clinker with gypsum is ground into portland cement and shipped
Hydraulic Portland CementBy definition:“a hydraulic cement produced by pulverizingclinker consisting essentially of hydraulic calciumsilicates, usually containing one or more of theforms of calcium sulfate as an intergroundaddition, and up to 5% limestone.”
Raw Materials and GrindingPlease return to Blackboard and watch thefollowing video: Video 1: Storage