Grinding is the required process when size reduction of below 5-20 mm is needed. Grinding is a powdering or pulverizing process. Hongxing supplies the right grinding solution to the clients every method and application.ne of the main raw materials in cement industry is limestone powder between 200mesh and 325mesh. Through crushing and fine grinding, raw materials (limestone and clay) are made into cement raw meal and calcined into cement clinker after fed into cement kiln.
Hongxing offers you raymond mill to pulverize your limestone to desired fineness. The vertical mill is kind of large scale powder grinding equipment which can work continuously with higher capacity. You can precisely control your desired fineness. After crushed in vertical mill, the limestone powder can be directly used to produce cement.
Limestone materials are feed to the center of the grinding table through the air locking feeder. Hot air comes into the grinding chamber. Materials move to the edge of grinding table from the center, and then are pulverized by the grinding roller until blown up by the airstream. Bigger materials fall down to the grinding table for further grinding. Finer limestone grains in airstream pass the separator on the top of the mill, and are gathered by dust catcher. By contacting the hot airstream, the moisture materials are dried to meet your moisture requirement.
Cement milling is usually carried out using ball mills with two or more separate chambers containing different sizes of grinding media (steel balls). Grinding clinker requires a lot of energy. How easy a particular clinker is to grind (‘grindability’) is difficult to predict, but rapid cooling of the clinker is thought to improve grindability due to the presence of microcracks in alite and to the finer crystal size of the flux phases. It is frequently observed that belite crystals, which have a characteristic round shape, tend to separate and form single crystal grains during grinding. vibrating feeder:http://www.hx-crusher.com/vibrating_feeder.html
clinker rotary kiln:http://www.hx-crushers.com/p116.html
Cement mills need to be cooled to limit the temperature rise of the cement. This is done by a mixture of both air-cooling and water-cooling, including spraying water inside the mill. The relative proportions and different solubilities of these various types of calcium sulfate are of importance in controlling the rate the rate of C3A hydration and consequently of cement set retardation. Problems associated with setting and strength characteristics of concrete can often be traced to changes in the quantity of gypsum and hemihydrate, or with variations in cooling rate of the clinker in the kiln and subsequent changes in the proportions or size of the C3A crystals.
For set regulation, the most important feature of aluminate is not necessarily the absolute amount present, but the amount of surface which is available to water for reaction. This will be governed by many factors, such as the surface area of the cement, the grinding characteristics of the different phases and also the size of the aluminate crystals. Over-large crystals can lead to erratic setting characteristics.
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