Cement of M-500 Balakleya is 25 kg 2523300000
Cement should be stored separately depending on the brand. Unpackaged cement is stored in closed containers, cement in packaging must be stored in dry rooms. Dampness in the warehouse is not allowed.
Cement can be stored in micro-sized containers (soft containers) made of polyethylene or propylene, the nature of this packaging should exclude moisture from entering the cement. When storing cement outdoors, it is necessary to provide a covering of film materials to protect the cement from rain, while the lower tier is folded onto a double or triple row of pallets.
During grinding, dosed additions of gypsum, slag, sand and other components are made to sintered products according to technological conditions, which makes it possible to obtain cement with a wide variety of properties, depending on consumer demand. Cement is not a natural material. Making cement is an expensive and energy-intensive process, but the result is worth it - the output is one of the most popular building materials, which is used both independently and as a component of other building materials (for example, concrete and reinforced concrete). Cement factories, as a rule, are located immediately at the site of extraction of raw materials for the production of cement.
Cement production includes two stages: the first is to obtain clinker, the second is to bring the clinker to a powdery state with an addition to gypsum or other additives. The first stage is the most expensive, it accounts for 70% of the cost of cement. And it happens as follows: the first stage is the extraction of raw materials. The development of limestone deposits is usually carried out by demolition, that is, part of the mountain is "pulled down", thereby revealing a layer of yellowish-green limestone, which is used for the production of cement. This layer is found, as a rule, at a depth of 10 m (up to this depth it occurs four times), and reaches 0.7 m in thickness. Then this material is sent along a conveyor for crushing to pieces equal to 10 cm in diameter. After that, the limestone is dried, and the process of grinding and mixing it with other components goes on. Further, this raw mixture is fired. This is how clinker is obtained. The second stage also consists of several stages. These are: crushing of clinker, drying of mineral additives, crushing of gypsum stone, grinding of clinker together with gypsum and active mineral additives. However, it must be borne in mind that the raw material is not always the same, and the physical and technical characteristics (such as strength, moisture, etc.) are different for the raw material. Therefore, a specific production method was developed for each type of raw material. It also helps to ensure good uniform grind and complete mixing of the components. In the cement industry, three production methods are used, which are based on various technological methods of raw material preparation: wet, dry and combined.
Wet method of cement production is used in the manufacture cement from chalk (carbonate component), clay (silicate component) and iron-containing additives (converter sludge, ferrous product, pyrite cinders). In this case, the moisture content of the clay should not exceed 20%, and the moisture content of the chalk - 29%. This method is called wet because the grinding of the raw mixture is carried out in an aqueous medium, the output is a charge in the form of an aqueous suspension - sludge with a moisture content of 30 - 50%. Further, the sludge enters the kiln, the diameter of which reaches 7 m, and the length is 200 m or more. Carbon dioxide is released from raw materials during firing. After that, the clinker balls, which are formed at the exit from the furnace, are ground into a fine powder, which is cement.
Dry method is that the raw materials are dried before or during grinding. And the raw material mixture comes out in the form of finely divided dry powder.
Combined cement production method , as the name suggests, involves the use of both dry and wet methods. The combined method has two varieties. The first assumes that the raw mixture is prepared by the wet method in the form of sludge, then it is dehydrated on filters to a moisture content of 16 - 18% and sent to furnaces for roasting in the form of a semi-dry mass. The second cooking option is exactly the opposite of the first:
|Brand of cement||M500|