Disadvantages of stratified caving method: (1) The consumption of wood is large, often reaching 0.03~O.O5m3/t. This shortcoming is more prominent in China where wood is insufficient; (2) the production capacity of ore is small, generally 1500~3000t / month; (3) there is a fire hazard; (4) the ventilation surface of the working face is not good.
Applicable conditions for stratified caving method: (1) The ore value is high. At this time, the economic significance of reducing the loss of ore loss is significant; (2) the loose ore of the ore is not stable and is not allowed to work under the exposed surface of the ore; (3) the surrounding rock is not Stable, it may collapse naturally after exposure to fill the goaf. If the surrounding rock cannot fall down with the mining and naturally collapses, manual forced topping is required to cause the rock cover layer; (4) The inclination and thickness of the ore body shall enable the artificial false roof to move down with the mining work. When the dip angle is large, the thickness of the ore body should be no less than 2m, and when it is inclined, it should be no less than 4~5 m; (5) the ground is allowed to collapse.
In addition, since the stratified caving method uses the mining raft as the smallest unit for recovery, it can be used to mine irregularly shaped ore bodies. After the mine is filled, it is sometimes returned to the mining column by stratified caving.
Description
DZG rotary vacuum dryer is a kind of new type sterile drying equipment. Its tank is installed in the sterile workshop, and the transmission parts and supports are installed in the outside of the sterile room. The middle parts is separated by a wall, and sealed by the silicon sealing ring, so as to ensure normal operation and production in the sterile area. This single-arm Vacuum Drying Equipment is suitable for aseptic production, which can effectively guarantee the product quality and fully meet the GMP standards.
Application
DZG rotary vacuum dryer is used for vacuum drying and mixing powdery and granular materials in pharmaceutical, health care products, food, chemical and other industries.
Features
1. The manhole cover on the tank adopts arc transition, which can avoid dead angle and accumulations. Cover is equipped with vibrating copper hammer in order to achieve the effect of anti-sticking and shaking off materials.
2. This vacuum drying equipment uses steam or hot water heating, and rotary joint for mechanical seal, thus ensuring operation without leakage.
3. DZG rotary vacuum dryer should use three or multipoint metal sintering nets in order to prevent the traditional filter bag and the abrasive dust of sealing cover from falling off. The sintering nets are easy to disassemble and clean.
4. There is a temperature measurement table on the tank. It is convenient to observe and adjust the temperature at any time.
5. The tank is equipped with a vacuum feeding and discharging outlet, also as sample connection, convenient for feeding and taking samples.
6. This vacuum drying equipment adopt quick-opening manhole, easy to operate, maintain, clean and sterilize.
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Jiangsu Yutong Drying Engineering Co.,Ltd , http://www.ytdryer.com