These balls are rubbed into powder.

1) wet method. This method is used in the manufacture of cement from chalk (this is a carbonate component), iron -containing additives (pyric cores, converter slopes and the like) and clay (silicate component). With this method, chalk should be moistened by 29 percent, and clay by 20 percent. This method received this name due to the fact that the grinding of raw materials takes place in water. The result is a sludge that has humidity up to 50 percent. At the next step, the slope is sent to the furnace for firing 200 meters long, and the diameter is 7 meters. During firing from the sludge, carbon dioxide is released. After firing from the furnace, get a clinker in the form of balls. These balls are rubbed into powder. This is the cement.