Vertical pressure filtration has become a preferred dewatering method across minerals processing operations where cake moisture content, throughput, and automation all matter. The tower press pressure filter addresses these requirements through a compact, fully automatic design that integrates filling, diaphragm pressing, air drying, and cake discharge in a single continuous cycle. For engineers evaluating solid-liquid separation pressure filter options in mining and minerals processing, understanding how this technology performs and where it fits best is a practical starting point.
Roxia’s Tower Press TP™ represents the current standard in vertical pressure filtration, available in two models: the Tower Press TP60™ and the Tower Press TP16™. The TP60 covers filtration areas from 60 to 168 m² and consistently achieves cake moisture values of 7 to 8% for base metal concentrates and 13 to 18% for tailings, depending on slurry characteristics. These figures reflect real operating conditions, not laboratory ideals, and are the reason minerals processing pressure filter applications increasingly specify this technology.
How tower press technology outperforms conventional filter presses
The fundamental advantage of the tower press pressure filter over a conventional horizontal filter press lies in its chamber geometry and multi-stage dewatering cycle. Slurry is fed under pressure into horizontal filter chambers stacked vertically. Liquid passes through the filter cloths and is collected as filtrate, while solids build up as a filter cake within each chamber. Once filling is complete, a diaphragm inflates under high pressure to mechanically compress the cake further, expelling liquid that primary filtration alone cannot remove. Compressed air is then blown through the cake to reduce moisture even further before discharge.
This sequence produces a consistently dry, uniform cake that conventional filter presses with single-stage pressing cannot match. The horizontal chamber orientation promotes even cake formation across the entire filtration area, which is important for both cake washing efficiency and final moisture uniformity. Where a conventional press might leave moisture variation across the plate pack, the tower press design minimises that variability because gravity assists cake distribution rather than working against it.
Automation and operator independence
The Tower Press TP™ uses a single continuous filter cloth that runs automatically through the full cycle: fill, filtration, diaphragm pressing, air drying, cake discharge, and cloth washing. Cake discharge requires no operator intervention. This is a meaningful operational difference in mining environments where labour availability is a constraint and where manual cake handling introduces both safety risk and process variability.
The complete cycle runs under programmable control and can be monitored remotely through the Roxia Malibu™ online portal, which connects the filter to real-time performance data and remote diagnostics. When a parameter drifts outside the expected range, the system identifies it before it becomes a failure, allowing maintenance to be scheduled rather than reactive. This is how the Tower Press TP™ supports high availability in continuous production environments.
Safety design
The tower press filter mining installation includes integrated safety systems as standard: perimeter protection, safety interlocked doors, and a caged ladder with a fall arrest system. These are not optional additions. They reflect the reality that pressure filtration equipment operates at elevated pressures in environments where personnel access must be controlled during the cycle.
Best applications for tower press filters in mining and minerals processing
The Tower Press TP™ is well suited to applications where low final moisture content is a process or commercial requirement, and where high throughput must be maintained with minimal operator involvement.
In base metal concentrate filtration, the TP60’s typical cake moisture of 7 to 8% meets the moisture specifications required for smelter feed or concentrate export without additional drying stages. Reducing moisture at the filtration stage lowers downstream energy consumption in drying or smelting, because less thermal energy is needed to evaporate residual water from the feed material. For copper, zinc, lead, and nickel concentrates, this directly affects operating cost per tonne of metal produced.
Tailings dewatering
Tailings dewatering is a growing application area as mining operations face increasing pressure to reduce tailings storage footprint and recover process water. The Tower Press TP™ achieves 13 to 18% cake moisture in tailings applications, producing a stackable cake that can be placed in a dry stack facility rather than a conventional tailings pond. Dry stack tailings reduce long-term closure liability and allow process water to be returned to the circuit immediately, which matters in water-scarce regions where Roxia operates, including Chile and Peru.
Other minerals processing applications
Beyond concentrates and tailings, the tower press pressure filter is used in iron ore pellet feed preparation, phosphate processing, and industrial minerals applications where both product purity and moisture specification are tightly controlled. The uniform cake formation and efficient cake washing capability of the horizontal chamber design make it suitable wherever washing soluble impurities out of the cake is part of the process.
Operational and lifecycle performance considerations
Selecting a tower press filter for mining requires more than matching filtration area to throughput. Slurry characteristics, including particle size distribution, solids concentration, and the compressibility of the cake, all affect cycle time, achievable moisture, and cloth life. Roxia recommends filtration testing with a minimum 20-litre slurry sample before equipment selection, because sizing based on assumed parameters rather than measured data leads to either undersized equipment or overcapacity that inflates capital cost.
Filter cloth wear is the primary consumable cost in pressure filtration. The single continuous cloth design of the Tower Press TP™ simplifies cloth replacement compared to multi-cloth plate pack configurations, and the automatic cloth washing at the end of each cycle extends cloth service life by preventing cake residue from drying and blinding the cloth between cycles. Longer cloth life reduces both consumable cost and the maintenance interventions needed to replace worn cloths during production.
Over the operational life of the equipment, performance can shift as feed conditions change or as components wear. Roxia’s Life Cycle Support for dewatering equipment covers spare parts, scheduled inspections, refurbishments, and process optimisation to maintain the filter’s performance at specification rather than allowing gradual degradation to go unaddressed. A filter running at reduced efficiency because of worn diaphragms or suboptimal cycle parameters costs more per tonne of dry product than one maintained to original specification.
For operations evaluating the Tower Press TP™ for a new project or considering it as a replacement for existing pressure filtration equipment, the right starting point is a filtration test on the actual slurry. Contact Roxia to request a filtration test. Our engineers will analyse your slurry, recommend the most suitable model, and size the equipment for your specific process conditions and throughput targets.