Slurry thickening duty: which equipment is specifically intended to convert a thin slurry into a thicker suspension prior to downstream handling or filtration?

Introduction / Context:
Before final dewatering, many plants perform a thickening step to raise solids concentration, reduce tankage, and improve filter performance. Thickening differs from filtration that targets a clear filtrate and a compact cake; the thickening objective is a pumpable but concentrated underflow.

Given Data / Assumptions:

• Feed is a thin slurry with low solids content.
• Desired product is a thicker suspension (not necessarily a rigid cake).
• Continuous or batch operation may be acceptable depending on process.

Concept / Approach:
Purpose-built thickeners (including pressure-assisted thickeners) increase solids concentration by settling and/or mild dewatering. Rotary drum vacuum filters and plate-and-frame presses are primarily cake filters aiming for clear filtrate and relatively dry cakes. Cartridge filters are for polishing, not bulk thickening.

Step-by-Step Solution:
Identify objective: higher solids concentration, still flowable.Match to device: dedicated thickener (here, “pressure filter thickener”).Exclude polishing or cake-focused units that overshoot the objective.

Verification / Alternative check:
Process flowsheets often place gravity/pressure thickeners upstream of presses or centrifuges to minimize filter area and cycle times.

Why Other Options Are Wrong:
Cartridge filter: used for fine clarification; easily plugs on slurries.Rotary drum vacuum filter / plate and frame: designed for cake formation, not just thickening to a suspension.

Common Pitfalls:
Attempting to achieve large concentration increases across a polishing filter leads to fouling and poor operability; use a thickener stage instead.

Final Answer:
Pressure filter thickener