Dofil Filtration Equipment

24/07/2026

A customer asked us:

“The filter cloth is blinding more often, and cycle times are getting longer. Should we replace it?”

Our first question is:

**What has changed in the process?**

Slurry concentration, particle size, chemical conditioning, feed pressure, and cleaning practices can all affect cloth performance.

Longer cycles, wetter cakes, and poor cake release may look like a filter cloth problem—but they are often symptoms of an upstream change.

**Before replacing the cloth, identify what has changed.**

A new cloth may solve the symptom.
The right process adjustment solves the cause.

09/07/2026

This batch of VPA20 mining filter plates** has just been completed in our workshop.

For replacement projects, the real challenge is not making a plate that looks similar. It is making sure every detail matches the customer’s existing filter press.

Before production, I usually confirm:

🔹 Overall dimensions, plate thickness, and total plate pack length
🔹 Feed and filtrate hole positions and diameters
🔹 Handle, rail, and support point locations
🔹 Sealing surface height and flatness
🔹 Filter cloth fixing method and plate arrangement

Even if the plate can be installed, one small mismatch may still cause slurry leakage, poor drainage, uneven cake thickness, faster cloth wear, or abnormal stress across the plate pack.

That is why, during production, we focus more on **batch consistency, hole accuracy, and sealing fit** than appearance alone.

For a mining customer, the goal is not to receive plates that are “close enough.”

The goal is to install them with minimal modification and bring the original machine back into stable operation as quickly as possible.

**A replacement plate should not only fit. It should keep working reliably after installation.**

08/07/2026

💥 Why Do Filter Plates Keep Breaking? Is It Really Because They’re Not Strong Enough?

When I see filter plates cracking repeatedly on site, I usually don’t blame the plate first. I check the whole system.

Common causes include:

1️⃣ Unstable raw material or poor manufacturing quality
2️⃣ High temperature or chemical conditions beyond the plate’s limits
3️⃣ Excessive feed or squeezing pressure
4️⃣ Blocked feed ports, drainage channels, or filter cloth
5️⃣ Torn, folded, or incorrectly installed filter cloth
6️⃣ Excessive closing force or plate pack misalignment
7️⃣ Residual cake trapped between the plates

My usual approach is:

✅ Check the actual operating pressure
✅ Clean the feed ports, drainage channels, and sealing surfaces
✅ Replace damaged or heavily blinded filter cloth
✅ Check plate alignment, hydraulic cylinder condition, and closing force
✅ Confirm the plate material matches the slurry temperature, pH, and chemistry
✅ Avoid sudden heating or cooling to reduce thermal stress

In many cases, the broken plate is only the final symptom. The real problem may be pressure, blockage, cloth condition, or operation.

💬 What do you see most often on site: cracking, deformation, or slurry spraying?

07/07/2026

From manual cake scraping after every cycle to much cleaner discharge — this time, I did not start with the discharge system. ⚙️

At the site, the problem was very clear:

The cake kept sticking to the filter cloth, discharge was incomplete, and operators had to clean the plates manually after each cycle. 😓

During the inspection, I focused on several key points:

🔹 Filter cloth material, permeability, and surface finish
🔹 Cloth ageing and blinding
🔹 Feed pressure and feed time
🔹 Cake thickness and final moisture
🔹 Slurry particle size, viscosity, and chemical dosing
🔹 Discharge time and cake release performance

The issue was not caused by one single factor.

The material was fine and sticky, the cloth surface was already partially blinded, and the final feed pressure and holding time were too high. The cake had become too dense and was almost locked onto the cloth.

We then:

🧼 cleaned the plate drainage channels
🧪 adjusted the chemical dosing
📉 optimized the feed pressure curve and cycle time
🧵 rechecked the filter cloth selection

The result was clear:

✅ Cleaner cake release
✅ Less manual scraping
✅ Shorter discharge time
✅ Lower cleaning frequency
✅ More stable filtration cycles

This is why I never look at cake discharge as an isolated problem.

Cloth selection, slurry properties, dosing, pressure, time, and moisture all show up in the final cake.

💬 What causes more trouble at your site:
cloth blinding, wet cake, or over-compacted cake?

03/07/2026

Clean cake discharge is never just luck.

On site, we often look at the final moment:
Does the cake drop cleanly?
Is the cloth still sticky?

But the real answer usually starts much earlier.

Chemical dosing, flocculation, feed concentration, filtration pressure, cycle time, cloth selection, and plate sealing — every small detail shows up in the final cake.

If one step is unstable, the result is clear:
wet cake, cloth sticking, poor discharge, more manual cleaning, and a slower production rhythm.

That’s why I believe a filter press should never be judged only by the machine itself.

From dosing to cake formation to final discharge, every step has to be stable.

In the end, the cake tells the truth.

What do you see most often on site:
wet cake, cloth sticking, or poor discharge?

29/06/2026

29/06/2026

Site update from coal washing plant!
Full replacement of 1500×1500 filter plates finished successfully.
Old plates suffered severe deformation & cracking after long-term coal slurry dehydration, causing leakage, low dewatering efficiency and frequent downtime.
Our new high-strength PP filter plates perfectly fit the original filter press, wear-resistant, anti-cracking and pressure-resistant, specially customized for harsh coal tailings working conditions.
After replacement, filter cake moisture drops obviously, production capacity restored to full load, less maintenance cost for the plant.
We supply standard & custom 1500 chamber / membrane filter plates, compatible with all mainstream filter press brands for coal washing, mineral sludge & tailings dewatering.
DM us for filter plate quotation & technical matching support!

24/06/2026

Do you replace your filter cloth directly — or clean it first? 🤔

In this video, we’re using a high-pressure water gun to clean the filter cloth while the plates are still installed in the press. 💧

A lot of people focus on replacement.
But in real operation, good cleaning and maintenance often matter just as much.

💬 How do you usually maintain your filter plates and filter cloth on site — regular cleaning, or only when problems appear?

24/06/2026

This week, I visited a large lithium iron phosphate (LFP) processing site.
At first, I only wanted to check how the filter press system was running.
But once I got there, the situation was more serious than expected:
3 filter presses were already facing shutdown risk. ⚠️
On the surface, the issue was damaged filter plates.
But on site, you quickly realize it is never just about “a few broken plates.”
What I saw was very real:
🔸 some plates could no longer seal properly, causing slurry spraying
🔸 once slurry starts spraying, the filter cloth gets hit directly, and its service life drops fast
🔸 uneven loading inside the plate pack increases the risk of leakage and misalignment
🔸 cycle times start drifting, cleaning becomes more frequent, and operators have to intervene more often
🔸 if this continues, it stops being a “plate replacement” issue and becomes a full machine shutdown problem
The more site work I do, the more convinced I am of one thing:
A lot of people think the main concerns in LFP filtration are cake moisture, filtration precision, or capacity.
But in real operation,
what often starts pulling the whole system down first is plate stability.
Because once the filter plates can no longer hold up,
the next problems come quickly:
sealing failure
shorter cloth life
unstable cycles
and pressure on the whole production line
So in projects like this,
customers are never just replacing filter plates.
They are trying to avoid a much bigger shutdown.
💬 For those working in LFP filtration, what usually shows up first on site:
slurry spraying, shorter cloth life, or cycle instability?