45. Storage, packing, shipment cement to the consumer

After grinding portland directed for storage in the cement silos, which are reinforced concrete towers (banks) of cylindrical shape. In these silos Cement is stored before packaging and sending it to the place of consumption. Served cement silos on pipes using airslides and pneumatic or screw chamber nasosov.Silosy cement plants are needed to prevent breaks in production in the event of possible faults with cement shipment. When maturing in silos coming from the cement mill is cooled. Furthermore, during storage svobodnayaSaO quenched, small amounts of which can remain in Portland cement. This improves its properties makes it more uniform change in volume. When storing slows down the speed setting tsementa.Obschaya Cement Silo capacity must comply with at least 10 daily output of the plant. When calculating the amount of cement contained in silos should be borne in mind that the weight of one cubic meter of 1m3 cement is 1.45 tons. The capacity of each silo is in the range of 2000-10000 tons, the height can reach up to 40 m and a diameter - up to 18 m in order to avoid the formation of dead corners Silo silo bottom is konicheskim.Kolichestvo cans calculated from the assortment of cement and the need to ensure effective control shipped. parties tsementa.dlya each type of cement must be at least two silos. The plants silos installed in two or more rows of cans or 4-5 in a row. Silos can be the bottom, resting on a column or set on concrete slab. The first is much more convenient to use, as they allow to apply various handling devices. Silos are equipped with filters to clean them exiting the pressurized air entering therein with cement. They are equipped with gauges, served on the board signals that the silo is filled tsementom.Tsement tends to cake and svodoobrazovaaniyu. Therefore, to loosen the cement at the bottom of the conical silo stacked porous tiles, through which the lower part of the silo is fed dry compressed air at a pressure of 3-4 bar. As a result, the cement is aerated, it becomes fluid and easily unloaded from the silo. The surface occupied by porous tiles on the bottom should be 15-25%. Consumption of compressed air to the aeration of 0.25 m3 / min. per 1m2 surface aeration with 20% porosity tiles. Instead porous tiles on some foreign plants in silos placed section of pipe with holes covered with a special cloth. Unloads cement from silos using bottom or side air razgruzhateley.Pered cement shipment is packed in paper bags or sent in bulk. Not Bagged cement is delivered to the consumer in samorazgruzhayuyuschihsya rail hopper cars, cement trucks and tanks for cement lifting capacity of 60 tons, as well as in cars cement-carrying capacity up to 35 tons. Cement equipped with devices for the pneumatic discharge of cement. It is also possible to ship cement in dry cargo barges and river longboats. Paper bags are made of 4-5 layers of moisture-resistant and heat-resistant paper. The bags are equipped with special valves that close automatically after filling the cement bag. Cement Weight (net) in paper bag 50 kg.Dlya cement packaging bags used stationary machines "Hammer" with the capacity of 25-40 t / h and rotary (turning) machine capacity of 60-120 t / h.