The wet process of cement manufacturing refers to grinding raw material into slurry after mixing with water and then feeding them into the wet process kiln for drying and calcination and finally forming clinker The slurrys water content is usually between 32 36 In addition the raw material slurry can also be dehydrated into raw material blocks and put into the kiln to calcine clinker This method is called the semi wet process which still belongs to the cement wet process production.
Advantages the wet process of cement production has the characteristics of simple operation low dust and easy conveying Because the slurry has fluidity so that its homogeneity is good and the quality of clinker is improved Whats more the energy consumption of raw material grinding in the wet process is reduced by nearly 30.
Disadvantages the heat consumption of the wet process is too high usually between 5234 6490 Jkg and the consumption of ball mill vulnerable parts is also large Compared with other processing methods the clinker manufactured by the wet process has a low temperature when it comes out of the kiln so this method is not suitable to produce the clinker with a high silica rate and high aluminum oxygen rate.
The dry process of cement manufacturing means that after raw materials with different particle sizes are dried broken and ground into powders of certain fineness they will be sent into the dry process kiln for calcining finally forming clinker Besides the raw material powder can also be made into raw material balls by adding a proper amount of water and then be directly sent to the Lepol kiln for calcining This method is called a semi dry process which belongs to the cement dry process production.
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The procedures of the wet process are basically the same with the dry process which can be divided into three stages raw materials preparation clinker calcination and the cement grinding All of these stages are covered in the article What You Need to Know about Portland Cement Manufacturing Process we mentioned before.
Similar to the dry process materials also needto undergo quarrying primary crushing secondary crushing proportioning andgrinding in the raw materials preparation stage of the wet process The biggestdifference between the two methods is that in the wet process water is usuallyrequired as a process media added in the raw mix to form slurry After mixingand blending the slurry will be stored in the slurry tank waiting for furtherprocessing While in the dry method cement production line the raw mix doesn8217tneed water.
In the calcination stage the cement kilnused by the wet process is longer in comparison to the dry process and thereis no preheater and precalciner in front of the kiln The temperature in cementkiln can reach 1400 1500 slurry in it is heated and dried and finally formingthe clinker compounds namely Di calcium Silicate Tricalcium Silicate Tri calcium Aluminate and Tetra Calcium Alumino Ferrite Clinker is a kind ofparticle with a variety of size and dark green color After cooled down in thegrate cooler they will be sent into the grinding mill for the last processing.
In the last stage clinker will be groundinto qualified fineness in grinding mills During this process we usually addsome gypsum and other materials into clinker to give the final cement productdifferent properties and usages For example we add gypsum to obtain theordinary Portland cement and add gypsum and fly ash to obtain the PozzolanaPortland Cement.
Conventionally grinding media was made of Cast iron Cast steel and even through Forged process in EN specifications However High Chrome Grinding media has surpassed the conventionally produced grinding media in terms of performance and is now widely being used by all industries across the globe.
The clinker from the pyro processing area is ground in ball mills or roll press Ball mill combination or vertical roller mills to form cement Commonly used separators are in closed circuit grinding are O sepa Sepol and Sepax separators to achieve a finish cement fineness of.
11 6 Portland Cement Manufacturing 11 6 1 Process Description1 7 Portland cement is a fine powder gray or white in color that consists of a mixture of accomplished during grinding in ball and tube mills or roller mills While thermal energy for drying can be supplied by exhaust gases from separate direct fired coal oil or gas burners.
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