Technical articles

Settle down - Selection of Liquid/Solid Separating Equipment

TCE

In this three-part article, in part 1 Messrs. Pierson and Perlmutter discuss testing, selection of liquid/solid separating equipment and give practical filtration tips. In part 2 of this, Messrs. Pierson and Perlmutter discuss the finer points of filtration. Finally, in part 3 of their series, Messrs. Pierson and Perlmutter provide a summary and preliminary selection guide for various types of pressure, vacuum, batch and continuous filtration equipment.

Published in: TCE - June 2009
PDF (2.0 MB)
Settle down - Selection of Liquid/Solid Separating Equipment
June 2009
June 2009

Size: 2.0 MB

Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross

AT MINERAL PROCESSING

Metal-containing waste, e.g. slag, incineration ash and dross, are formed during the production of metals and are to be recycled as waste-derived materials. To obtain an optimal and marketable separated product from the processing of these material groups, the process parameters must be individually adjusted depending on the required final product, but series of tests conducted at the BHS test centre have shown that the above-mentioned wastederived materials can be processed in the same machine systems despite different their material properties.

Published in: AT MINERAL PROCESSING - 5/2009
PDF (180 KB)
Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross
5/2009
June 2009

Size: 180 KB

Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross

METALL

Metal-containing waste, e.g. slag, incineration ash and dross, are formed during the production of metals and are to be recycled as waste-derived materials. To obtain an optimal and marketable separated product from the processing of these material groups, the process parameters must be individually adjusted depending on the required final product, but series of tests conducted at the BHS test centre have shown that the above-mentioned wastederived materials can be processed in the same machine systems despite different their material properties.

Published in: METALL - 5/2009
PDF (2.3 MB)
Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross
5/2009
May 2009

Size: 2.3 MB

A treatise of filter cake washing mechanisms in pressure and vacuum filtration systems

BHS-Filtration Inc.

During many chemical and pharmaceutical process operations, cake washing is required since no filter system can remove all of the mother liquor by pressure or vacuum dewatering only. The need for cake washing to produce a “clean cake” for further processing, drying or disposal can be for several reasons including the removal of the mother liquor, exchange of solvents, dissolution of soluble components and the displacement of insoluble contaminants.
The topic of “how to most efficiently wash the cake” is one that many process engineers struggle with when considering the various techniques available to meet the economic, production and quality requirements of the operation. Chemical engineering textbooks are notoriously shy on the subject and such information that is available is frequently lost in a host of theoretical equations. This article introduces pragmatism into cake washing theory and will help to guide engineers during their decision-making processes.

Published in: BHS-Filtration Inc. - June 2008
PDF (462 KB)
A treatise of filter cake washing mechanisms in pressure and vacuum filtration systems
June 2008
June 2008

Size: 462 KB

A Review of Filter Press Basics Versus Alternative Technologies

PharmaChem

Filtration experts, over the years, have discussed and debated filter presses and have indicated that soon they would be a thing of the past; the last filter press would be replaced by more modern equipment. Given that filter presses were amongst the oldest mechanical dewatering devices, this was a fairly plausible suggestion. However, now, almost half a century later, any chemical engineering exhibition shows that filter presses are alive and well and are going to be around for years to come. True, they look different from the ones in the 1950’s, but essentially they are still the same device. Their continued presence is a tribute to the filter press manufacturers who embraced new materials and upgraded the mechanics and configurations. However, the basics are still the same and much of the issues surrounding filter presses remain valid.

Published in: PharmaChem - Mai 2008 - 33
PDF (323 KB)
A Review of Filter Press Basics Versus Alternative Technologies
Mai 2008 - 33
May 2008

Size: 323 KB

A Review of Filter Press Basics Versus Alternative Batch or Continuous Technologies

BHS-Filtration Inc.

The range of liquid/solid separation equipment is very large and without an intimate knowledge it can be confusing and even illogical, the main reason being that there are only two basic principles of liquid/solid separation. This means that equipment which an independent expert would not necessarily chose first can still be made to work, albeit with poor efficiency. This implies that you should be extra careful with suppliers who offer only one type of equipment, as it may well be that although it can be made to work, it may not be the best choice!

Published in: BHS-Filtration Inc. - 2008
PDF (384 KB)
A Review of Filter Press Basics Versus Alternative Batch or Continuous Technologies
2008
March 2008

Size: 384 KB

A Treatise of Filter Cake Washing Mechanisms In Pressure and Vacuum Filtration Systems

BHS-Filtration Inc.

During many chemical and pharmaceutical process operations, cake washing is required since no filter system can remove all of the mother liquor by pressure or vacuum dewatering only. The need for cake washing to produce a “clean cake” for further processing, drying or disposal can be for several reasons including the removal of the mother liquor, exchange of solvents, dissolution of soluble components and the displacement of insoluble contaminants.
The topic of “how to most efficiently wash the cake” is one that many process engineers struggle with when considering the various techniques available to meet the economic, production and quality requirements of the operation. Chemical engineering textbooks are notoriously shy on the subject and such information that is available is frequently lost in a host of theoretical equations. This article introduces pragmatism into cake washing theory and will help to guide engineers during their decision-making processes.

Published in: BHS-Filtration Inc. - December 2007
PDF (462 KB)
A Treatise of Filter Cake Washing Mechanisms In Pressure and Vacuum Filtration Systems
December 2007
December 2007

Size: 462 KB
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