Phosphoric Acid Filtration: How Optimized Filter Media Boost Process Performance

In our latest White Paper “Phosphoric Acid Filtration – Process Optimization”, we show how optimized textile filter media support key process stages – from phosphate rock washing to phosphoric acid clarification and water removal & recovery.

Why filtration performance matters

Phosphoric acid environments place high demands on mechanical stability and chemical resistance. Whether you’re working with horizontal vacuum belt filters, pan-filters or filter presses, well matched filter media can make a measurable difference in:

• dewatering efficiency
• throughput
• service lifetime
• filtrate purity

A well-optimized media setup increases both process reliability and product consistency.

A preview from the White Paper

To spark interest, here’s an original excerpt:

“With Markert’s customized solutions, end customers achieve notable improvements, including reduced production costs, enhanced product quality, increased productivity, and an improved safety and environmental footprint.”
 

The full document goes deeper into how these improvements are achieved under real process conditions such as hemi hydrate, di hydrate, and contaminated water recovery operations.

What you’ll learn in the full White Paper

The White Paper provides clear, practical insights into:

1. Phosphate Rock Washing
How filter belts support stable dewatering performance on horizontal vacuum belt filters.

2. Phosphoric Acid Clarification
Key differences between hemi-hydrate and di-hydrate conditions — and what these mean for media selection.

3. Water Removal & Recovery
Why precise fabrication and cake release behavior are critical in filter press applications.

4. Customized Filter Media
How laboratory analyses help determine the optimal textile structure for each plant setup.Why this matters for your operation

Process matched filter media lead to:

• more stable filtration results
• improved product quality
• reduced operating costs
• fewer unplanned interruptions

Our White Paper highlights where these improvements originate and how they translate into measurable process benefits.

Access the complete document in our Knowledge Library:
 

Phosphoric Acid Filtration – Process Optimization

FAQ: Markert – Presence in Phosphoric Acid Filtration

1) What does Markert do in phosphoric acid filtration?
Markert designs and manufactures tailored textile filter media for phosphoric acid and phosphate processing, including phosphate rock washing, phosphoric acid clarification, and contaminated process water treatment. The goal is to improve filtration performance, reliability, and total cost of ownership.

2) Which benefits can optimized filter media deliver in phosphoric acid applications?
With application-specific filter textiles, you can typically achieve lower operating costs, improved product quality, higher throughput, better dewatering, and a stronger environmental and safety footprint—depending on process conditions and equipment.

3) Where does filtration occur in the phosphate-to-phosphoric-acid process chain?
Phosphate rock (apatite) is processed through steps such as crushing, flotation, thickening, and washing, followed by multiple filtration and dewatering stages. Horizontal vacuum belt filters are commonly used for dewatering and clarification-related duties.

4) What filter belt advantages does Markert offer for phosphate rock washing on horizontal vacuum belt filters?
Markert filter belts for horizontal vacuum belt filters are engineered for:

• Excellent dewatering performance
• High flow rates
• Long service life
• Precise fabrication
  This helps stabilize operation and improve overall process efficiency.

5) What is phosphoric acid clarification, and why is the filter medium critical?
Clarification removes solids from phosphoric acid to support consistent quality and stable downstream processing. The filter medium strongly influences separation efficiency, filtration throughput, cake formation, residual moisture, filtrate clarity, and service lifetime under demanding chemical and thermal conditions.

6) Which Markert solutions are available for pan filters (mostly hemi-hydrate)?
For pan filters used in hemi-hydrate conditions, Markert offers:

• PPD 3115: a proven standard solution
• PPD 90314: a premium-quality option designed for longer service life (e.g., via increased thickness, higher tensile strength, and thicker yarns—configuration dependent)

7) Which Markert solution supports di-hydrate clarification on horizontal vacuum belt filters?
For di-hydrate operation on horizontal vacuum belt filters, Markert offers DID 11137. Based on comparative plant testing, it is positioned to deliver:

• Service lifetime improvement up to ~40%
• Filtration throughput increase up to ~25%
• Reduced residual moisture
• Higher separation efficiency and fewer solids in filtrate
  Belt widths up to 4.5 m can be implemented (application dependent).

8) Which Markert solution supports hemi-hydrate clarification on horizontal vacuum belt filters?
Hemi-hydrate processes typically require fabrics with very high air permeability (often around ~1000 L/dm²·min as a reference, process dependent). Markert’s DID 11028 is positioned as an alternative and has been successfully tested in practice. Key targets include high lifetime, strong throughput, and precise fabrication.

9) What does Markert provide for contaminated water removal and recovery with filter presses?
Markert supplies filter press cloths designed for demanding water purification duties where fabric precision and stable filtration performance matter. A representative option is PPD 3134, designed for:

• Clear filtrates
• Excellent cake release
• Easy installation
• Tailor-made production
• High flow rates
• Dry, clean filter cakes
• Good cleanability

10) How does Markert develop customized filtration solutions for phosphoric acid systems?
Markert combines decades of application expertise with laboratory testing and performance screening to match the filter medium to your process parameters (e.g., chemistry, pH, temperature, solids load, particle size, and equipment configuration).

11) Which laboratory tests and fabric measurements are part of Markert’s development approach?
Depending on your application, Markert can evaluate:

• Filtration tests and fabric screening (e.g., pressure nutsche testing)
• Electrical resistance through and along the fabric
• Air permeability and water permeability
• Pore size via microscopy
• Area weight, binding type, fabric material, thickness, yarn type
• Abrasion behavior and chemical resistance

12) How do I start a project with Markert for phosphoric acid filtration media?
A typical start includes sharing your process conditions (equipment type, temperature, pH, solids content, particle size, target performance) and, when possible, fabric samples or baseline data. Markert then supports screening/testing, selection, and implementation—plus technical follow-up.