What is the manufacturing process of Portland cement?

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Emamicement
What is the manufacturing process of Portland
cement?
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What is the manufacturing process of Portland
cement?
The process used by cement manufacturing
companies in india consists of grinding the raw
materials , mixing them intimately in certain
proportions depending upon their purity and
composition and burning them in a kiln at a
temperature of about 1300 to 1500 C, at which
temperature clinkers are formed and they are made
into fine powder in addition with 3 to 5 of
gypsum to form portland cement. Types of
processes There are two processes known as
wet and dry processes depending upon whether
the mixing and grinding of raw materials are done
in wet or dry conditions. For many years wet
process remained popular because of the
possibility of more accurate in the mixing of raw
materials. Later, the dry process gained momentum
with the modern development of techniques for
strong cement.
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What is the manufacturing process of Portland
cement?

• Wet process
• In this process, the raw materials are changed
  to powdered form in the presence of water. In
  this process, raw materials are pulverized by
  using a Ball mill, which is a rotary steel
  cylinder with hardened steel balls.
• When the mill rotates, steel balls pulverize
  the raw materials which form a slurry(liquid
  mixture). The slurry is then passed into storage
  tanks, where correct proportioning is done.
• Proper composition of raw materials can be
  ensured by using a wet process than dry process.
  The corrected slurry is then fed into rotary kiln
  for burning.
• This process is generally used when raw
  materials are soft because complete mixing is not
  possible unless the water is added. Actually, the
  purpose of both processes is to change the raw
  materials to a fine powder.

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What is the manufacturing process of Portland
cement?
Dry process In this process, calcareous
material such as limestone (calcium carbonate)
and argillaceous material such as clay are ground
separately to a fine powder in the absence of
water and then are mixed together in the desired
proportions. Water is then added to it for
getting a thick paste and then its cakes are
formed, dried and burnt in kilns. This process
is usually used when raw materials are very
strong and hard. In this process, the raw
materials are changed to powdered form in the
absence of water.  
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