DEMining of ore
Storage of ores in the silo
The mined ore is transported with conveyor systems and stored in large aboveground or underground silos until it is sent on to the next processing stages. Large amounts of dust and noise are generated in the storage silos. The different particle sizes and constantly changing repose angles must not influence the accuracy of the level measurement. Contactless measurement is ideal for determining the contents of a silo.
Level measurement with VEGAPULS 68
VEGAPULS 68 is predestined for level measurement of bulk solids under extreme conditions. Due to its high sensitivity it is able to deliver reliable measurement data from bulk materials silos up to 70 m (230 ft) high. Excellent focusing is achieved through the implementation of very high sensor frequencies and antennas specially optimised for bulk solids. Internal vessel installations, struts and buildup on the vessel walls thus do not interfere. Neither the repose angle of the bulk solid nor strong dust generation can influence the measuring result. Thanks to the contactless measurement with microwaves, the sensor is subjected to no wear whatsoever.
Overfill protection with VEGACAP 65
In addition to the continuous level measurement, a second independent sensor is applied for overfill protection. The capacitive measuring technique is the right choice for bulk materials silos with such high requirements on measurement stability. Extreme ruggedness and easy set-up are distinguishing features of the VEGACAP 65 capacitive level switch. The switching state of VEGACAP 65 is displayed on a bicolour LED and is easily visible on the outside of the plastic housing.
Primary and secondary stone crushers in ore mining
To transport and mine the largest possible amount of ore in the plant, the ore must be composed of pieces of the right size.The ore is broken down into the optimal grain size in two steps in the primary and secondary stone crushers. The crusher silo as well as the crusher rollers are subject to heavy wear that depends directly on the amount of material in the crusher. When the crusher is too full, the pressure on the breaker rollers and the resulting wear are very high. If the filling volume is too low, however, capacity utilisation and thus the overall plant output will also be too low.
Level monitoring with VEGAPULS 67
The radar sensor VEGAPULS 67 feels really comfortable even in the most difficult process conditions, such as dust generation and intense filling noise. Due to its high emission frequency and antenna system optimised for bulk solids, VEGAPULS 67 has a very narrow emission beam. This makes measurement possible directly in the throat of the stone crusher. All sensor settings, such as basic adjustment and fine tuning to the application, can be carried out during normal operation. The universal installation fittings enable easy adaptation to existing equipment.
