Name: Candle Filter
Brand: JX Filtration

Description

JX Filtration offers a full range of candle filter housings from compact single-element units to large multi-candle configurations, with flexible customization options to suit various batch sizes and clarification duties across chemical, pharmaceutical, food, and metallurgical applications—enclosed, automated, and built for consistent filtrate quality.

A candle filter, also known as a candle filter housing or filter-candle pressure vessel, is a batch-operated pressure filtration device in which multiple vertical candle-shaped filter elements are mounted inside a single containment vessel. Feed slurry is introduced under pressure, and clarified liquid passes through the filter medium on each candle while solids accumulate on the outer surface as a cake. When the cake reaches the desired thickness, the vessel is depressurized and the cake is discharged by a reverse-flow impulse, after which the filter medium is ready for the next cycle.

Working Principle

Cake Formation: Feed slurry enters the pressure vessel and flows through the filter medium on each candle element. Solids are retained on the outer surface, forming a cake layer that itself becomes part of the filtration medium. Clear filtrate passes through the candle support body, exits through the central tube of each candle, and is collected via a common manifold.
Cake Washing & Drying: When required, the cake can be washed in place by displacement or recirculation to remove residual mother liquor. Subsequent drying is achieved by blowing gas or steam through the cake, reducing moisture content before discharge.
Impulse Discharge: At the end of the cycle, the vessel is vented, the discharge valve opens, and a short reverse-flow impulse expands the filter cloth. The cake detaches from the candle surface, breaks into fragments, and drops out of the discharge opening. The filter medium is immediately ready for the next filtration cycle without manual intervention.

Advantages

No moving parts – The absence of drive mechanisms inside the pressure vessel improves operational safety and reduces maintenance demand
Large filtration area in a compact vessel – Multiple candle elements arranged in a single housing provide extensive filtration surface with a small equipment footprint
Enclosed pressure operation – The entire process runs in a gas-tight, pressurized system, suitable for hazardous, sterile, or inert-atmosphere processing
Reusable filter media – The filter cloth is regenerated by impulse discharge after each cycle, eliminating disposable cartridge or bag consumption
Cake washing and drying integrated – The cake can be washed and gas-dried in place before discharge, improving product recovery and reducing downstream handling
Fully automated batch cycles – PLC-controlled sequencing of filtration, washing, drying, and discharge supports unattended operation and consistent batch-to-batch results
High filtrate clarity – The cake layer formed on the candle surface acts as a depth filter, capturing fine particles and delivering polished filtrate

Application

Chemical Processing
Pharmaceutical & Biotechnology
Food & Beverage
Metallurgy & Mining
Petrochemical & Lubricants
Electroplating & Surface Finishing
Water Treatment

Materials & Connection Types

Housing Materials: Carbon steel, stainless steel 304, 316, 316L, titanium, and other corrosion-resistant alloys on request.

Filter Element Materials: Special stainless steel support body with filter cloth in PP, PE, PPS, PTFE, or nylon; sintered metal elements also available.

Candle Interfaces: Threaded connection (M20, M30), 222 interface, 226 interface.

Discharge Method: Reverse-flow gas impulse discharge; cake can be washed and gas-dried before discharge.

Control System: PLC with touch panel interface; automatic sequencing of filtration, washing, drying, and discharge.

Connection Types: Flanged inlet/outlet and discharge connections; customizable pipe diameters and flange standards.