Industrial Centrifuge Sourcing
Screen Scroll Centrifuge for Continuous Crystal Dewatering
A screen scroll centrifuge is a continuous filtering principle in which a screw or scroll transports retained solids along a rotating screen while liquid passes through the filtering surface.
Sourcing Reference XTE-CEN-SSC-001
Direct answer
A screen scroll centrifuge retains solids on a rotating screen and moves them continuously with a screw or scroll while liquid drains through the screen. It may suit free-draining crystalline or granular material when screen retention and transport are demonstrated. Particle breakage, screen wear, bypass, feed stability and wash duty remain project-specific.
When is this centrifuge a good fit?
| Good-fit tendency | Poor-fit or review trigger |
|---|---|
| Representative particles retain on an appropriate screen. | Fine particles pass through or blind the screen. |
| Continuous screw transport is compatible with the solids. | The solids smear, compact or cannot be transported reliably. |
| The material drains without forming an unmanageable cake. | Allowable breakage is lower than the proposed handling can demonstrate. |
| Wear and screen-access requirements can be defined. | A carefully staged batch wash is essential. |
| The buyer can state a feed and result envelope. | Feed variability and upset response are undefined. |
This is a routing screen, not a machine selection or performance guarantee. Final selection requires qualified process review and, where useful, representative material testing.
What process data are required?
Selection begins with a feed envelope and required result, not with capacity alone. The same named chemical can behave differently because crystal distribution, mother liquor, solids concentration, temperature, upstream conditioning and wash duty differ.
Unknown values should be marked unknown and closed through a representative test or agreed engineering assumption. They should not be silently replaced by catalogue data.
| Data group | Buyer input | Why it changes the review |
|---|---|---|
| Material identity | Product, solids, liquid phase and known contaminants | Prevents an equipment name from being treated as a complete duty definition. |
| Particle behaviour | Distribution, shape, fragility, density and settling or filtration observations | Supports the first principle screen and representative test plan. |
| Feed envelope | Minimum, normal and maximum flow; solids concentration; variability; batch or continuous operation | Defines the operating window rather than a single nominal point. |
| Liquid properties | Composition, viscosity, density, pH, chloride or other corrosion contributors, and temperature | Guides wetted-material, sealing, cleaning and safety review. |
| Separation targets | Cake moisture or dry solids, recovery, filtrate or centrate target, purity and allowable breakage | Turns a general request into measurable acceptance criteria. |
| Washing duty | Wash liquid, stage, ratio or sequence and purity objective | Changes residence, cake handling and test requirements. |
| Upstream/downstream | Feed conditioning, crystallizer or reactor, pumps, dryer, recovery and handling equipment | Identifies interface limits and control dependencies. |
| Site and utilities | Indoor/outdoor, area classification, ambient range, altitude, power, water, air and nitrogen | Controls installation scope and source-specific option review. |
| Documents and destination | Country, electrical basis, inspection, FAT, SAT, manuals and buyer-required conformity evidence | Prevents document and compliance gaps after commercial comparison. |
How does the working principle affect separation?
Feed reaches a rotating screening zone. Liquid passes through openings while retained solids are moved along the screen by a scroll toward discharge. The available residence, washing arrangement and solids motion depend on the source-specific geometry and controls.
The principle is not interchangeable with a solid-bowl decanter: one relies on a filtering screen, while the other relies primarily on sedimentation in a solid bowl.
Which design choices must be confirmed?
The buyer should compare source proposals against one controlled data sheet. Each deviation needs a technical effect, commercial effect and disposition before price comparison.
| Choice | Required confirmation |
|---|---|
| Wetted materials | Exact grade, component scope, corrosion basis and evidence; do not rely on a generic “stainless steel” description. |
| Separation element | Screen, cloth, bowl or wear-part arrangement and how it relates to the tested feed. |
| Feed and discharge | Interfaces, operating envelope, blockage or upset response, and downstream handling responsibility. |
| Drive and controls | Motor and drive basis, interlocks, monitoring, PLC boundary, protocol and buyer control philosophy. |
| Sealing and containment | Process hazards, leakage boundary, ventilation or inerting requirement, and source evidence. |
| Cleaning and access | Cleaning method, access points, changeover expectation and safe maintenance isolation. |
| Wear and maintenance | Expected wear locations, inspection method, replacement procedure and recommended spares. |
| Installation scope | Foundation loads, layout, lifting, piping, cabling, commissioning and exclusions. |
What should a performance guarantee include?
A performance value without feed and test boundaries is not comparable. Define how, where and when each result will be measured, who witnesses it, and what happens if the agreed criterion is missed.
| Result | Boundary that must be written down |
|---|---|
| Throughput | Feed composition, solids basis, temperature, operating time and variability. |
| Cake result | Sampling point, moisture or dry-solids method, sample conditioning and averaging rule. |
| Recovery | Mass-balance boundary, sampling interval, analytical method and allowable unaccounted loss. |
| Liquid quality | Filtrate or centrate sampling location, solids method and stable-operation condition. |
| Washing or purity | Wash sequence, liquid, ratio, analysis method and feed impurity envelope. |
| Crystal integrity | Particle-size method, before/after sampling and allowable change where breakage matters. |
| Mechanical acceptance | Vibration, temperature, leakage, interlock and run-test method agreed for the actual source. |
This page explains selection logic. It does not confirm a supplier, machine size, performance guarantee, material compatibility or certification. Those items are verified against the chosen source and project specification.
What should be tested before purchase?
Material testing, design review, FAT and SAT answer different questions. A no-load factory run cannot demonstrate process performance, while a site trial cannot correct an unfrozen interface without cost and delay.
| Stage | Purpose | Buyer record |
|---|---|---|
| Representative material test | Check separation behaviour and reveal missing data before final selection. | Sample identity, conditioning, settings, mass balance, observations and result method. |
| Design review | Freeze interfaces, materials, controls, documents and agreed guarantee basis. | Approved data sheet, drawings, deviation register and responsibility matrix. |
| Factory acceptance test (FAT) | Verify the agreed factory-test scope before release. | Protocol, calibrated instruments where applicable, raw readings, nonconformities and signed disposition. |
| Site acceptance test (SAT) | Check installation, utilities, feed condition and project performance under the agreed site basis. | Commissioning record, feed envelope, sampling, results, open items and remedies. |
Documents and export scope
The contract should identify required documents, submission timing, review status and final language. Checking a standards title does not establish source-specific compliance.
- Approved technical data sheet and supplier deviation list
- General arrangement, interface, foundation-load and lifting information
- Wetted-material schedule and source-specific material evidence requested by the buyer
- Motor, drive, instrument, interlock and control-system documentation
- Inspection and test plan with hold or witness points
- Material-test, FAT and SAT protocols and records where included
- Safety, operation, cleaning and maintenance manuals in the agreed language
- Spare-parts, wear-parts and recommended maintenance list
- Packing, preservation, lifting marks and shipping-document requirements
- Destination-specific conformity evidence requested by the buyer; availability remains subject to source confirmation
Material and application routes
Salt crystallization
Compare screen retention and continuous transport using representative material.
Representative equipment references
What we need for technical review
- Material and liquid identities, composition and safety data where applicable
- Particle distribution, shape, fragility and available settling or filtration observations
- Feed solids, temperature, viscosity, pH, density and minimum/normal/maximum feed rate
- Target cake result, recovery, liquid clarity, purity, washing and allowable breakage
- Operating mode, upstream/downstream equipment and known problems with the current method
- Wetted-material, corrosion, abrasion, containment and area-classification requirements
- Site, utilities, controls, destination, inspection and document requirements
- Available process data sheet, P&ID, layout, photos, lab report, particle report or current nameplate
Related sourcing and trade services
Independent sourcing boundary
XiangtanExport is an independent sourcing and export coordination service. It is not presented as the machine manufacturer and does not publish a supplier directory on this page.
Source identity, model, commercial terms, certificates and source-specific capability evidence are reviewed privately against the buyer requirement.
Frequently asked questions
Is a screen scroll centrifuge a decanter?
No. A screen scroll is a filtering principle with a screen; a decanter is a solid-bowl sedimentation principle.
What particle data are needed?
Provide a representative distribution, shape, fragility and any observed fines variation or agglomeration.
How should screen life be handled?
Ask the selected source to define material, wear basis, inspection, replacement method and recommended spares.
Can wash duty be added later?
Wash location and result should be included before design freeze because they affect residence, drainage and acceptance.
Does continuous operation eliminate feed buffering?
No. Upstream variability and control response still need an agreed interface and upset plan.
What validates the principle?
Representative material behaviour, a controlled data sheet and qualified engineering review support the decision.
Sources & references
GB 19815-2021, Centrifuge—Safety requirements, National Public Service Platform for Standards, published 2021-04-30, effective 2022-05-01, accessed 2026-09-07.
GB/T 10895-2025, Centrifuge & separator—Measurement and evaluation of mechanical vibration, National Public Service Platform for Standards, published 2025-08-01, effective 2026-02-01, accessed 2026-09-07.
These public standards identify review topics; they do not prove that a particular source, model or project complies. Source-specific drawings, certificates, test records and deviations are checked privately before quotation.
Send process data for technical review
Provide the material, feed envelope, separation target, utilities, site and document requirements. We will identify missing data before private supplier matching.
Review and evidence note
Last reviewed: 2026-09-07
Principle-level wording supports initial buyer decisions. Numeric performance, material compatibility, conformity and supplier-specific capability require source-specific evidence and project review.
Final product availability, specification, documentation and commercial terms are confirmed during supplier matching and quotation.