For separating abrasive solids suspended in a corrosive liquid stream, which filtration device is generally the most suitable choice (consider material compatibility and wear)?

Difficulty: Medium

Correct Answer: Plate and frame filter press

Explanation:


Introduction / Context:
Abrasive solids erode internals, while corrosive liquids attack metals and elastomers. The chosen filter must allow corrosion-resistant contact surfaces and withstand abrasion without rapid failure.


Given Data / Assumptions:

  • Abrasive solids + corrosive liquid.
  • Need robust, maintainable, pressure-driven separation.
  • Flexibility in media and plate materials is advantageous.


Concept / Approach:
Plate and frame presses accommodate a wide range of chemically resistant plates, gaskets, and fabrics (e.g., polypropylene, PTFE-lined components). The batch operation and high-pressure driving force make them suitable for difficult slurries, while replaceable cloths mitigate abrasion wear. Sand beds and vacuum filters struggle with severe abrasion and material compatibility. Basket centrifuges can handle abrasives but are less favored when corrosion resistance and flexible media selection dominate concerns.


Step-by-Step Solution:
Prioritize corrosion-resistant construction and replaceable cloths.Evaluate abrasion handling and maintenance practicality.Select plate and frame press.


Verification / Alternative check:
Industry practice frequently deploys polypropylene plate presses with appropriate fabrics for corrosive, abrasive slurries.


Why Other Options Are Wrong:
Sand bed: limited solids handling, difficult backwash with abrasives.Vacuum filter: larger wear surfaces; material compatibility may be limiting.Basket centrifuge: viable for some cases, but material-of-construction and cloth options are more versatile in plate and frame systems.


Common Pitfalls:
Overlooking fabric and plate material selection to combat corrosion.


Final Answer:
Plate and frame filter press

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