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:: New High-efficiency HVBF Filters to be Produced in Australia by Outokumpu
New generation high efficiency horizontal vacuum belt vacuum filters (HVBFs) are to be manufactured in Australia by Outokumpu Technology.
The Pannevis RB-CDV and RT filters are designed to eliminate conventional impediments to the efficiency of HVBFs in mineral processing and chemical industry dewatering applications.
Improvements of the Pannevis designs over conventional types include enhanced hydraulic capacity and energy efficiency, high purity cake (up to 99.99 per cent from the RT) and reduced mechanical complexity, offering installation and maintenance cost benefits.
HVBFs are increasingly used as the sole mechanical dewatering technology where the material generated by the separation process has high solids content, such as cyclone underflow in iron ore washing. HVBFs are also preferred technology for filtering coarse materials, such as fine coal dewatering, and for hydrometallurgical applications including cake washing, where they are used as an intermediate step to wash away salts or recover liquid.
The new RB-CDV filter which is more suited to coarse particle, single-pass dewatering has its vacuum box positioned on one or both sides, instead of underneath the filter, as in conventional designs. Because the vacuum box is therefore easily accessible for operational and maintenance reasons, the structure around the RB-CDV can be minimised and installation costs reduced. Further advantages of the RB-CDV include:
The new RT filter, meanwhile, is more suited to complex cake washing dewatering applications, similar to those frequently encountered in the chemical industry. The RT design eliminates the rubber support belt found in conventional filters. Instead, an open grid tray along the full length of the filter supports the filter cloth. The cloth, when under vacuum pulls the tray along at the same speed as the cloth until it reaches the travel end. The vacuum is briefly cut off to retract the tray to its original position and the vacuum is reapplied.
The major advantage of the RT filter is its ability to accommodate multi-step processing in one unit. This makes it possible to address complex dewatering requirements encountered in hydrometallurgical and chemical applications, including multiple washing steps, vibration, hot air drying and mechanical compression of the cake. Further advantages include:
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