Candle Filter

Product Overview

The candle filter is a precision clarification device characterized by advanced technology, safety, high efficiency, energy conservation, pollution-free operation, and automatic, hermetically sealed filtration. Utilizing solid particles or filter aids as the filtration medium, the candle-style element design ensures complete discharge of liquid residue from the vessel, preventing cross-contamination between batches; the absence of structural obstructions at the bottom of the filter elements facilitates efficient discharge, which can be operated manually, pneumatically, or electrically through a large discharge port. The vertical installation of the filter elements further aids in vertical discharge. This equipment comes closest to meeting full sanitary standards among all filtration systems and offers diverse structural configurations (materials include 304/316L stainless steel, PP, PPS, PTFE, etc.). The reusability of the filtration medium significantly reduces consumable costs; the secure, sealed vessel design ensures a leak-free production process; and the entire operation is controlled by an automated microcomputer system.

Working Principle

During operation, a pump feeds the material to be filtered into the unit. As the liquid passes through the filter cloth, solid matter gradually accumulates on the surface, eventually forming a filter cake. The minute interstices between the cake particles trap impurities, thereby clarifying the filtrate. Before the filter cake layer is fully established, the discharged "clear liquid" is recirculated back to the raw material tank; once the cake layer forms (meeting filtration specifications), the system signals the PLC to stop recirculation, and the clear liquid is directed through the outlet valve to the next processing stage for standard filtration. Technical Features

• Capable of direct filtration, pre-coat filtration, slurry concentration, cake recovery, and washing

• PLC-controlled automation for all process stages: liquid filling, pre-filtration, filtration, residual liquid discharge, cake discharge, and back-blowing

• Suitable for high-precision, high-solids, and high-viscosity applications

• Multi-level filtration precision, down to 0.22 microns

• Grouped filter element design reduces air consumption during back-blowing and allows for the isolation of damaged elements

• Enclosed filtration system to control contamination

• Drying capability available for recovering drier filter cakes

• Residual material filtration design to minimize product waste

Industry Applications

• Chemical Industry: Amine solutions, electrolytes, polyols, titanium dioxide, PTA, polyglycols, potassium carbonate, epoxy resins, catalyst recovery

• Food & Beverage: Fruit juice, syrup, sucrose, alcoholic beverages, edible oils, drinking water, gelatin, ultra-pure crystals

• Metalworking: Cleaning agents, coal tar, machining coolants, metal sheet/foil rolling oils, copper foil

• Biopharmaceuticals: Citric acid, fermentation extracts, antibiotics, pharmaceutical intermediates, herbal medicine preparations

• Water Treatment: Filtration of various wastewaters, such as heavy metal, battery manufacturing, magnetic material, electrophoresis, coal mine, coal yard runoff, and fluoride-containing wastewater

• Oils, Fats & Inks: Dewaxing, decolorization, and fine filtration of industrial oils; filtration of biodiesel, hydraulic oil, waste oil, mixed oils, base oils, diesel, kerosene, lubricants, transformer oil, etc.