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What is a cement mill and cement grinding plant?

  • Cement is an important construction material in modern building, road construction etc. Cement is produced from limestone, gypsum, coal etc. In the process of cement production, crushing plant and grinding plant is necessary.

    cement millCement mill, also called cement grinding mill plant is used for grinding raw materials of cement in the cement grinding processing. A cement mill is an installation used to grind the clinker component of concrete. Clinker is a hard, nodular material produced by sintering aluminosilicate and limestone in a cement kiln. There are several cement mill types which are able to grind clinker of which the ball mill is the most common. Ball mills consist of cylinders partially filled with large numbers of steel balls which employ their rolling action to crush the raw material when each cylinder is rotated. High pressure roller mills are occasionally used to grind clinker although their use has not yet gained broad acceptance.

    The chief constituent of portland cement is a sintering product of limestone and aluminosilicate known as clinker. This hard, pebble like material is the ingredient in cement which causes it to "cure" and harden to form the mortar or concrete used so extensively in construction. The clinker sintering or heat combination process produces a coarse, nodular material of particular hardness which requires fine grinding prior to cement production. Particle sizes of below 45 ┬Ám are required which, due to clinker's hardness, requires a particularly efficient milling process.
  • Cement Grinding Plant
  • Divided by cement production process, there are four types of cement company which includes the cement plant, cement clinker factory, cement grinding plant and preparation plant.

    In the present situation of cement industry, the design and construction of cement grinding station has adopted many new features. While most of the cement clinker production line is set up near the mine, most cement grinding plants are set up around the city, not far from the selling market which greatly reduces transportation cost. At the present, cement grinding plant is developing towards large-scale along with the consideration of separation grinding of materials.

    In cement production, the traditional cement mill grinding process is of huge energy consumption, accounting for 70% of total electricity consumption of cement. Therefore, it is the cement companies' great demand about how to reduce the energy consumption which will greatly reduce cost and improve efficiency. At the moment when saving space in the cement kiln is becoming smaller and smaller, improving the cement grinding plant system would be helpful to the cement industry.
  • Cement Ball Mill
  • Traditional cement mill also named as cement ball mill, raw material mill, material grinding mill and clinker mill, is the key equipment for grinding after the cement crush process, which is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics, etc. Cement ball mill can be used for the dry and wet grinding for all kinds of ores and other grind-able materials.

    Ball mill is highly effective grinding systems which subject the raw material to relatively low heat and pressure levels. They consist of large diameter, rotating cylinders or drums driven by electric motors. The drum is partially filled with high-chromium steel balls or, occasionally, cubes. These roll around freely inside the cylinder when it is rotated. This rolling action crushes clinker by impact and then grinds it finely due to friction between the balls. Ball mills often feature a intermediate partition that divides the cylinder into two sections with differing ball sizes allowing for progressive grinding in one mill. The efficient grinding of clinker in a ball mill is subject to closely controlled drum speeds. At rotational speeds above the critical speed of a mill, the contents are simply forced against the sides of the drum by centrifugal force with little or no grinding action. The size of the balls is also an important consideration in a cement mill. If the balls are too large, the raw material will not be ground finely enough.

    According to different materials and discharging methods, there are dry cement ball mills and wet cement ball mills for choice.
  • Cement Vertical Mill
  • Cement vertical mill is the main and new process equipment in the cement grinding plant. LM series cement vertical mill is of strong crushing, high crushing efficiency and good operational stability. To some extent, reducing the power consumption or increasing the system output has solved concerns of low production of cement, running instability, etc.

    By replacing cement ball mill with cement vertical mill, we can realize the role of reducing energy consumption. Relatively speaking, using cement vertical mill to grind cement raw material, coal and blast furnace slag has been fine for the mature technology. As long as we control the cement particle size distribution, water demand, the types of ingredients in the gypsum and grinding temperature and so on, to achieve large-scale promotion of the cement vertical mill use is very promising.

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