Comparison of 4 Popular Thickeners | How to Pick the Right One

Picking the right thickener allows enterprises to handle tailings efficiently, recover water for production reuse, and improve plant sustainability in all aspects. To choose a suitable thickener, you need to fully evaluate various factors including material traits, process parameters and production goals.

We have listed the key parameter comparison of 4 mainstream thickener types: High-Rate Thickeners, High-Density Thickeners, Deep Cone Thickener(Ultra Rakeless Thickeners) and Paste Thickeners. You can select the optimal model according to your actual production demands.

Specifications	High-Rate Thickeners	High-Density Thickeners	Deep Cone Thickeners	Paste Thickeners
Core Structure	Rotating rake; low side wall, mild bottom slope	Rake + vertical drain rods; taller side wall, steep bottom slope	No rakes / moving parts; tall tank, 60° steep bottom	Rake + dense drain rods; ultra-tall side wall, 30°/45° steep bottom
Underflow Yield Stress	10–30 Pa (medium density)	50–100 Pa (high density)	30–60 Pa (medium-high density)	＞150 Pa (paste, max density)
Discharge Pump	Centrifugal pump	Centrifugal pump	Centrifugal pump	Positive displacement pump
Sludge Bed Retention Time	1–2 h	2–4 h	4–8 h	4–10 h
Flocculant Consumption	Very low	Medium	Relatively high	Medium
Water Recovery Rate	~85%	Higher than HRT	Medium	Industry maximum
Overflow Clarity	Excellent	Excellent	Good	Moderately acceptable
Floor Space	Compact	Smallest	Minimal	Medium (tall tank)
Drive System	Hydraulic, with rake lift & torque monitor	Hydraulic, with rake lift & torque monitor	No drive unit	High-torque hydraulic drive
Maintenance Workload	Low	Low	Minimal	Medium
Equipment Cost	Low, cost-efficient	Medium	Medium	High
Total Operation Cost	Lowest	Medium	High (high chemical cost)	Medium (high pump & civil cost)
Core Strengths	Large capacity, low chemical use, clean overflow	High thickening effect, fits filtration & counter-current washing	Simple structure, ultra-reliable, few failures	Paste underflow without free water, small tailings yard
Main Drawbacks	Cannot produce paste underflow	Higher configuration cost	Heavy flocculant reliance	High investment, limited throughput
Suitable Scenarios	Sand/coal mines, water-short plants, general tailings thickening	Pre-treatment before filters, counter-current washing	Remote mines, sites with few maintenance workers	Strict environmental projects, tailings dry stacking, overseas large mines
Unsuitable Scenarios	Projects requiring paste dry stacking	Extremely narrow sites without professional staff	Sites with tight chemical control & high density demand	Low-budget sites, places unable to install displacement pumps