1.Natural sand drying system
It is unavoidable that the natural sand have water, the cement of dry mix mortar with the water will make hydration if we use it directly, as a result, the mortar will loss of efficiency. So the natural sand needs drying, and remove the water from the sand. And it will satisfy the demand, if the water content of sand is reduced to less than 0.5%. The temperature of finished sand higher than 70℃ is not suitable, otherwise, it will impact the performance of additives. If equipped with a large sand storage bin which can use it after lower the finished sand’s temperature, at the same time, the temperature of the finished sand can not under 70℃. however, in the aspect of energy utilization and conservation, the finished sand’s temperature control under 70℃, the drying system energy utilization rate will achieve the highest. Wet sand feedstock of drying system should be continious, adjustment, gaugeable. And at the conveying equipment should install missing material blocking alarm. The heat energy of the drying system is prefer to clean energy, such as natural gas. It should be install desulfurization and desulfurization device if you choose the coal as the fuel. The dried dyer prefer to use the two or three drum dyer. The inner of the roller have Wear - resistant spiral blade and bucket, it can make the material toss uniformly and advance at a constant speed. Through the hot gas which product by the flue gas furnace take away the water, and achieve the purpose of drying. Three drum roller drying machine can reduce the temperature of finished sand effectively and improve the utilization rate of the heat energy. The dust collection equipment should be equipped at the drying system, generally, it adopt Pulsed back - blowing dust remover or atmospheric back - blowing dust remover. If you want to reduce the stress of the bag dust collection, Inertial or cyclone dust collection can be set as a level of dust collection. The dust collector inlet duct is provided with a temperature sensor and a cold air door.when the wind’s temperature over the set point, the cold air door opens automatically to prevent heat wind burn out the dust bag. The dust was collected by the dusty machine can be added according to the characteristic of the powder and mortar production requirement. Finished sand should be stored in a closed container or have a way of isolating air to prevent the vapour enter into the dry sand again. 2.Sand production system
Recently, the technical of sand making have a big changes. Especially, dry system product sand. Great progress has be made in the aspect of eco-friendly, energy conservation, grain shape, powder choice, and the manufactured sand can be used for dry mix mortar. If use stone to make sand, can set the primary crushing. At the present, At present, there are two kinds of sand making systems, field sand making and tower sand making. The raw material feed of the sand making system should be continuous, adjustable and measurable. If the belt conveyor is adopted, a sealing cover is set along the belt above the belt. Sand machine generally taboo iron, it is possible to damage the sand machine internal lining plate throwing first class hard and brittle wear resistant parts, so in the sand machine before the installation of iron remover. Sand machine should be selected vertical impact sand machine, vertical impact crusher produced by the sand and grade is better, can improve the mechanical properties of mortar and construction performance.