Portland cement
What is Portland cement? Portland cement is a hydraulic cementing material made from Portland cement clinker, 5%-20% mixed materials, and a certain content of gypsum. The Portland cement, also called silicate cement, is a common cement used in civil engineering and construction.As for the types
Send inquiryWhat is Portland cement? Portland cement is a hydraulic cementing material made from Portland cement clinker, 5%-20% mixed materials, and a certain content of gypsum. The Portland cement, also called silicate cement, is a common cement used in civil engineering and construction.
As for the types of Portland cement, there is ordinary Portland cement, composite Portland cement, Portland slag cement, Portland fly-ash cement, etc. The ordinary Portland cement contains 5-20% active addition; other types of Portland cement generally contain more than 20% active addition.
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How to make Portland cement? The answer isPortland cement plant. The Portland cement production is similar to most types of cement making, including cement raw materials preparation, clinker production, finished cement production. Specific Portland cement manufacturing process as follows:
STEP1: Crushing and pre-homogenization of Portland cement
Inthe portland cement production, most of raw materials should be crushed, such as limestone, clay, iron ore, coal and etc. The lime stone is the main raw material of Portland cement making, because its big size and high hardness, the lime stone crushing is more important in the cement crushing. The Portland cement pre-homogenization means that use stacker and recalimer to homogenize the raw material preliminary, the raw material yard plays double role in storage and homogenization.
STEP2: Portland cement raw materials
In general, at least three tons raw materials (including raw material, fuel, mixed materials, gypsum,etc.) is required for per ton of Portland cement manufacture. According to the statistic, the cement grinding plant consume more than 60% energy in the dry process cement production line, raw meal grinding takes 30% and above, so, to ensure cement quality and reduce energy, it is important to select cement grinding mill and cement grinding plant reasonably, optimize cement grinding process, control the operating system.
STEP3: Portland cement raw meal homogenization
The raw meal homogenizing is the last key to stabilize the raw meal of kiln feeding system, in the dry process cement production line, the stable raw meal of kiln feeding system is the premise of cement clinker plant thermal regulation.
STEP4: Preheating and precalcining of Portland cement
When the airflow carries the raw meal into the cyclone, it is forced to make a rotating flow in the annular space between the cyclone cylinder and the inner cylinder (exhaust pipe), and it moves downward while rotating,from the cylinder to the cone, and the movement can be extended to the end of the cone, and then turned upward to rotate upward, discharged by the exhaust pipe.
STEP5: Portland cement clinker production
After the preheating and precalcining, the qualified raw meal will be calcined and cement clinker is produced. We can generally divided the clinker production into six steps, including raw materials drying, raw materials dehydration,decarbonation, clinker cooling, sintering reaction and solid-phase reaction.
STEP6: Portland cement grinding
When the Portland cement clinker is ready, cement grinding plant process cement clinker into finished Portland cement. Then the finished cement can be stored in bulk or packed into bags.
STEP7: Portland cement storing and packing
