Achieve Unmatched Purity in Sodium Dichromate Crystallization with Our Advanced Candle Filter Solution
In the demanding world of chemical processing, achieving a crystal-clear feed for your crystallizer is paramount to product quality and operational efficiency. For a major Indian client specializing in sodium dichromate production, the challenge was clear: effectively remove suspended sodium sulphate solids from a highly acidic solution to ensure an impeccable final product.
Addressing the Specific Filtration Challenge
The process required the purification of a sodium dichromate solution, contaminated with 25 grams per litre of suspended sodium sulphate. The key objective was to deliver a brilliantly clear filtrate to the crystallizer, while the captured solids could be responsibly disposed of for sodium sulphate recovery. Operating within a pH of 4-5 and at temperatures up to 90°C, the filtration system needed to be robust, efficient, and reliable.
Our Engineered Candle Filter: Precision-Engineered for Performance

We provided a state-of-the-art Candle Filter, meticulously designed to meet these exacting requirements.
Filtration Area: 17m2
Material of Housing: Carbon Steel.
Dia of Housing: 1210 mm
Material of Filter cartridge: SS 304
Quantity of Filter Cartridge: 38 pieces with length 1750mm
Cartridge Pitch: 140 mm
Accuracy: 5um,
Design pressure: 6 Bar,
Working pressure: 4 Bar,
Design temp: 150 deg C,
Working Temp-85-90 deg C,
Cover Sealing: VITON,
Body Thickness: 6mm,
Cloth Material: Polyester
Automatic Pneumatic Bottom Discharge with Carbon Steel Support Discharge.
Here’s how its technical specifications deliver outstanding results:
Optimized Filtration Area (17 m²): Perfectly handles the volumetric flow of 15-25 M³/HR, ensuring consistent process throughput.
Superior Filtration Cloth: Features a PTFE-laminated Polyester cloth, offering excellent chemical resistance in the acidic environment and achieving the desired nominal flow permeability of 0.7 to 1.2 m³/hr per m².
High-Efficiency Cartridge Design: With 38 SS 304 cartridges and a fine 5-micron accuracy, the system guarantees the removal of fine sodium sulphate particles, delivering the pristine solution quality essential for the crystallizer.
Robust Construction & Safe Operation: The Carbon Steel housing (6mm body thickness) and a design pressure of 6 Bar ensure long-term durability and safety, withstanding a working pressure of 4 Bar.
Why This Filter is the Ideal Choice for This Process
This installation is a testament to how tailored engineering solves complex industrial problems. By ensuring a pure feed to the crystallizer, our candle filter directly enhances product yield and quality. The robust design promises longevity even in a challenging acidic environment.
For producers of sodium dichromate and similar inorganic salts, this filter represents the gold standard in solid-liquid separation.
Ready to enhance the purity and efficiency of your chemical processes? Contact us today to discover how our filtration solutions can be customized for your specific application.
[Shanghai Junyi Filter Equipment Co.,Ltd] – Filtration Experter










