Fines, solids and chemistry
Changed PSD, clay, concentration, temperature or reagents can reduce cake permeability.
Evidence-led moisture troubleshooting
How to Reduce Disc Filter Cake Moisture
Troubleshoot high filter cake moisture by checking feed concentration, particle size, vacuum, disc speed, cake thickness, cloth condition and drying time.
Measurement + feedFirst check
Cake + vacuumCore drivers
One variableChange method
Moisture vs capacityDecision
Safe diagnostic methodFeed Vacuum Cycle
Confirm the Moisture Result and Operating Context
A higher result can come from a real filtration change, a different sample, inconsistent laboratory method or a changed feed. Verify the measurement before adjusting the machine.
Driving force and air leakage
Low or unstable vacuum, flooding or leakage can shorten effective drying.
Formation, thickness and drying time
Disc speed, slurry level and valve zones determine the time available.
Safety before inspection or maintenance
Stop the equipment and isolate all hazardous energy that can cause rotation, vacuum, pressure, stored mechanical movement, electrical energization or chemical exposure. Follow the site lockout and permit procedure; inspection and maintenance must be performed only by authorized personnel.
Troubleshooting sequence1 2 3 4 5
Separate Feed, Vacuum, Media and Cycle Causes
Change one controlled variable at a time and retain the before-and-after operating evidence.
Verify sample
Repeat sampling and laboratory method.
Compare feed
Review solids, PSD, chemistry and temperature.
Check vacuum path
Trend vacuum, filtrate and leakage indicators.
Inspect media
Assess blinding, damage, fit and cake release.
Run controlled trial
Change one approved setting and compare capacity too.
Evidence to record
Build a Trend, Not a Snapshot
Use the same instruments, sampling points and laboratory method so changes can be compared.
Cake resultSampling point, time, method, replicate and production condition.
Feed conditionSolids, density, PSD, temperature, pH and relevant chemistry.
Machine settingsDisc speed, slurry level, valve timing and wash state.
Vacuum systemVacuum by zone, pump state, receiver level and valve condition.
MediaType, age, permeability trend, blinding, damage and fit.
ProductionDry-solids rate, cake thickness, discharge and downtime.
Corrective-action logic
Lower Moisture Without Creating a New Bottleneck
More drying time can reduce throughput; thinner cake can affect release; higher vacuum demand can expose leakage or auxiliary limits.
| Finding | Review | Possible controlled response |
|---|---|---|
| Feed became finer or lower-solids | Upstream operation, sample data and test history. | Restore feed control or retest the changed duty. |
| Vacuum is below stable baseline | Leaks, valve, piping, receiver, pump and filtrate removal. | Repair the confirmed constraint before raising setpoints. |
| Media permeability declined | Deposit, wash coverage, damage and cloth age. | Apply approved cleaning or replace with verified media. |
| Drying time is too short | Disc speed, immersion and valve-zone relationship. | Trial an approved cycle change while tracking dry throughput. |
| Cake is too thick or uneven | Feed level, solids, agitation, formation and sector condition. | Stabilize feed and formation before optimizing moisture. |
Continue the project path
Continue the Diagnostic Path
Use related technical and service pages to resolve the underlying cause.
Practical answers
Frequently Asked Questions
These answers support project preparation; the final recommendation depends on the actual duty.
Why is representative slurry data required?
Mineral names do not define filterability. Particle-size distribution, mineralogy, clay, reagents, solids and temperature can change cake formation, permeability and release. Use filterability testing when results matter commercially.
What should be sent for a preliminary review?
Provide dry-solids throughput, feed solids, particle-size data, target cake moisture, operating schedule, elevation and available utilities through the quote request.
Can BOYUN promise cake moisture from the mineral name alone?
No. A defensible target must be tied to representative feed data, test conditions, equipment scope and an agreed operating basis.
Define the Next Engineering Step
Share the feed, throughput, operating target and site constraints. BOYUN will identify missing information and recommend testing, sizing or the appropriate equipment scope.