Cement is a soft bonding material that has a cohesive and contiguous material, provided that water is available, making it able to bind the concrete components to each other. The most important uses of cement (concrete and mortar), which binds natural and industrial materials to form strong materials used in construction and resistance to normal environmental effects. There is a difference between cement and concrete. Cement refers to a dry powder used to bind materials used in concrete. There are two types of cement: water cement and non-hydro cement. The cement industry is a strategic industry. Its industry relies on the availability of raw materials. It contains two basic materials: clay and clay. These materials are crushed in crushing machines. They are mixed with each other according to the parameters determined by the laboratory and passed after grinding through a kiln of heat (About 1430 ° C). This results in a material called clinker, in addition to other materials, and is placed again in the milling machine where we get the cement, then the bags are filled with special. Cement is composed of two main materials: the girl and the limestone, and two new additives, depending on the nature of each plant or factory, sand and iron. These materials are designated in the laboratory to correct the proportions to be reached. Sometimes the stone and the girl The cement is composed of four raw oxides: SiO2, Al2O3, CaO, Fe2O3. When grinding raw materials does not occur any chemical reactions, but the process of milling to increase the surface of the particle surface, so that it is ready to enter the chemical reactions, to expose all the granules of these reactions. The percentage of raw materials in milling is about 75% stone, 20% child, 3% sand, 2% iron, and these percentages vary according to the analyzes and results. Three factors are taken into consideration: silica coefficient, lime saturation coefficient, alumina , And each of them significance and significance in terms of operational, in addition to the quality of the product. The method of cement production When the raw material is removed from the mill, it is entered into a silo for storage, and its importance is in flipping. This is followed by a chemical reaction phase. This is done in a huge building called the tower, which is a huge reservoir, one with a flame, and they are connected to each other. The raw material of the kiln is composed of a large, slightly tilted cylinder that revolves around itself. At the end of the cylinder there is a huge flame. The four oxides coalesce into the kiln, forming the so-called clinker phases, which are raw materials in the cement industry. Clinker or enter it in the second stage to form the cement. Cement is made in three ways, after which the best and optimum chemical compound is found. These methods are: wet method in which raw materials are selected and mixed with water. This method is based on crushing, mixing, grinding, heating and then placing in the coolant. Packaged in bags. Dry method This method began to spread, to replace the wet method gradually, because of its energy saving, and its control in the process of mixing and mixing raw materials without the need to add water, and this method of cracking the raw materials and mixing and then grinding and then placed in the oven , Followed by final grinding and packaged. Semi-dry method is a special case of dry process, used by the oven with a column, and the raw material is formed in the dry process in the form of granules, the water is added to it by 13%.