cement clinker - wikipedia,cement clinker is a solid material produced in the manufacture of portland cement as an intermediary product. clinker occurs as lumps or nodules, usually 3 millimetres to 25 millimetres in diameter. it is produced by sintering limestone and aluminosilicate materials such as clay during the cement kiln stage..detailed wet process of cement manufacturing,the fused mass turns the fuse into a ball with a diameter of 3 to 25 mm kn called as clinker. the clinker falls into a cooler that cools under controlled conditions. cooled clinker and 3-5% of gypsum are crushed in a ball mill to the necessary fineness and then taken to storage silos, packed with cement..
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cement ball mill. capacity: 12-105t/h applicable materials: cement silicate products chemical fertilizers various ores and etc. cement mill is the key equipment for crushing after the material is broken.cement mill is widely used in cement silicate products new building materials refractories chemical fertilizers black and non-ferrous me tal mineral processing and glass ceramics and other
common applications for our ball mills is grinding of clinker for cement manufacturing, mineral ore’s, calcium bauxites, silicates and other materials that can be
during normal production process, the clinker is always calcined in a fixed temperature range. according to the fluctuation of raw meal composition, the calcination temperature of clinker is generally between 1350℃ and 1450℃. if the temperature in the kiln is too low, it is easy to produce underfired clinker.
the output achieved by a ball mill system varies with the mill power, the fineness of the product and the hardness of the clinker. a typical general purpose portland cement of fineness (specific surface) 340 m².kg -1 ground on an efficient closed-circuit ball mill system requires around 32 kwh per tonne, so a 10 mw mill would produce 313 tonnes of this per hour.
clinker comes out of the kiln as grey balls, about the size of marbles. step 4:cement grinding and storage clinker and gypsum for ordinary portland cement(opc) limestone for limestone cement, and slag for slag cement are all extracted from their respective hoppers and fed to the cement mills.
the grinding if clinkers in modern plants is carried out in the cement mill which contains chromium steel balls of various sizes. these balls roll within the mill and grind the mixture which is collected in a hopper and taken in the bucket elevator for storage in silos. the cement from silos is fed to the packer machines.
as the feed enters the mill, the balls continuously crush and grind the clinker and gypsum into a fine powder, a process known as comminution. this powder is sent to a classifier, where the coarser particles are returned to the mill for further grinding and the finer, more delicate particles are sent to a pneumatic pump and conveyed to storage silos.
like cement, the clinker will react with water and harden, but because it is composed of 1-3 cm diameter fragments it is too coarse to be used. step 4 - cement milling to produce the final product the clinker is mixed with gypsum (caso4 • 2h2o), which is added as a set retarder, and ground for approximately 30 minutes in large tube mills.
the proportioning of clinker, gypsum and fly ash is done by electronic weigh feeders. in modern plants, clinker and gypsum are precrushed in a roller press and subsequently fed into ball mill for fine grinding. the installation of roller press technology is very beneficial in terms of both quality and energy conservation.
when clinker and blastfurnace slag are interground in a ball mill the blastfurnace slag with its poorer grindability is less finely ground, but trials in a semi-industrial polysius roller mill
in line 1 and two roller press+closed circuit ball mill in line 2) based on the type of cement to be produced keeping the quality of cement equal or above the required standard. for instance (clinker+pozzolana+gypsum) are proportioned and milled to produce ppc type of cement, (clinker+gypsum) to produce opc type of cement,
cement manufacturing process. cement is a material which is used to bind other materials together. binding means it has an effect of gluing the substances together due to cohesive and adhesive action and then hardens and sets in order to become permanent. cement is usually not used on its own; it is mixed with other materials called aggregates
the invention provides a process for manufacturing white cement which includes steps of recovering flue gases generated during the quenching and drying process, extracting heat from the recovered flue gases to obtain water condensate and to generate electrical energy.
the cement ball mill is a horizontal cylinder filled with steel balls or other grinding media. inside the cylinder, the steel balls are rotated and tumbled and crush the clinker into very fine powders, which are product cement powders. during the grinding process, a small percentage of gypsum is added to the mix to control the setting time of cement.
clinker is a nodular material produced in the kilning stage during the production of cement and is used as the binder in many cement products. the lumps or nodules of clinker are usually of diameter 3-25 mm and dark grey in color. it is produced by heating limestone and clay to the point of liquefaction at about 1400°c-1500°c in the rotary kiln.
the manufacture of cement is a very carefully regulated process comprising the following stages: 2.1. quarrying - a mixture of limestone and clay. 2.2. grinding - the limestone and clay with water to form slurry. 2.3. burning - the slurry to a very high temperature in a kiln, to produce clinker. 2.4. grinding - the clinker with about 5% gypsum
in the rotary kiln the raw meal is then burned to create portland cement clinker, the basic material for all types of cement. the next step is to grind the clinker in a ball mill equipped with steel balls of varying sizes. depending on the type of cement, other materials such as granulated blast furnace slag can be added at the grinding stage.
the clinker drops into the rotary cooler where it cool under controlled conditions. the cool clinker is then ground in a ball mill with the addition of 2 to 3% of gypsum. in the ball mill, particles crush to a fine powder and filled into bags. the following flow sheet shows the details of the wet process in the manufacture of cement –
cement milling: the clinker is ground by different-sized steel balls while it works its way through the mill’s two chambers, with gypsum being added to extend cement setting times. cement packaging and shipping : the cement is then housed in storage silos, from where it is hydraulically or mechanically extracted and transported to facilities where it will be packaged in sacks or supplied in
disadvantages: the heat consumption of the wet process is too high, usually between 5234-6490 j/kg 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
cement manufacturing involves a grinding process of clinker, gypsum and secondary mineral additions, usually carried out in ball or vertical roller mills. efficiency of grinding (in terms of energy actually used to increase cement fineness over total energy) is usually very low and reported to be in the range 10-30%.
the clinker is ground in a ball mill—a horizontal steel tube filled with steel balls. as the tube rotates, the steel balls tumble and crush the clinker into a super-fine powder. it can now be considered portland cement. the cement is so fine it will easily pass through a sieve that is fine enough to hold water.
the clinkers as obtained from the rotary kiln are finely ground in ball mills and tube mills. during grinding, a small quantity, about 3 to 4 percent, of gypsum is added. the gypsum controls the initial setting time of cement. if gypsum is not added, the cement would set as soon as water is added.
2. wet process of manufacturing of cement. it is considered a better and convenient process for the manufacture of cement, especially where limestone of soft variety is available in abundance. we can discuss this process under three headings; preparation of slurry; burning or calcination; and treatment of clinker. so let’s move on.