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Share your ore details for a suitable processing route
Tin grade alone is insufficient for selecting a processing plant.
The investigation should establish whether tin occurs mainly as cassiterite, whether the mineral is liberated, and which associated minerals enter the same recovery products.
This solution focuses on cassiterite-bearing ores. Material containing a significant proportion of other tin minerals requires a separate assessment.
Before selecting equipment, determine:
Use representative samples from the expected mining zones. Rich hand specimens may help identify minerals, but they do not represent the operating feed.
| Feed Type | Main Challenge | Processing Route to Evaluate |
|---|---|---|
| Free-washing alluvial ore | Recover liberated cassiterite across different sizes | Washing, screening and classified gravity recovery |
| Clay-rich alluvial ore | Release cassiterite from clay without excessive losses | Scrubbing, screening and separate treatment of fines |
| Hard-rock cassiterite ore | Liberate cassiterite while controlling fines generation | Staged crushing, selective grinding and gravity recovery |
| Sulfide-bearing tin ore | Manage sulfides and their effect on concentrate quality | Gravity recovery combined with a tested sulfide separation stage |
| Fine tin-bearing tailings | Recover small or partly liberated cassiterite | Size-by-size assessment of gravity, regrinding and flotation options |
Alluvial cassiterite may already be liberated from the original host rock. In that case, the preparation duty is to remove clay, separate unsuitable oversize and deliver controlled feed to the recovery circuit.
A grizzly and feeder can regulate the incoming material. Washing equipment should then be selected according to the behavior of the clay and the amount of disaggregation required.
A trommel screen separates material by size, but screening alone may not break down persistent clay lumps. Where necessary, evaluate a scrubber ahead of the sizing stages.
Conceptual route:
Raw feed → Washing or scrubbing → Screening → Gravity recovery by size → Concentrate cleaning
Large particles should not automatically be treated as barren waste. Sample the oversize to establish whether it contains coarse cassiterite, mineralized fragments or clay lumps retaining fine valuable minerals. The results determine whether it can be rejected, washed again or sent for further treatment.
Clay removal also needs a tin-loss assessment. Measure the mass and tin content of the removed fine fraction before choosing a desliming cut. A cleaner-looking gravity feed is not an improvement if preparation discards a substantial part of the recoverable tin.
Cassiterite can respond to gravity separation because of its density difference from many common gangue minerals. Separation performance still depends on liberation, particle size, feed stability and the other minerals present.
A single machine should not be expected to treat every size fraction equally well.
| Recovery Duty | Equipment to Evaluate | Main Selection Considerations |
|---|---|---|
| Suitable coarser fractions | Jig separator | Liberation, size range, bed conditions and water supply |
| Fine classified feed | Shaking table | Deck type, feed rate, particle size and slurry density |
| Selected fine recovery duties | Centrifugal concentrator | Test response, operating mode and concentrate yield |
| Rough concentrate cleaning | Shaking table or another tested cleaner | Grade–recovery balance and associated heavy minerals |
Shaking tables can be used for classified fine feed or for cleaning a rough gravity concentrate. Deck selection and operating conditions should match the material reaching the table.
Every product needs a defined destination. For example, a tested arrangement may use a jig for roughing and a shaking table to clean its concentrate. The table may produce concentrate, middlings and tailings, each requiring separate assessment.
Middlings should be examined before retreatment. Partly locked material may benefit from further liberation, while liberated particles may respond better to adjusted separation conditions.
Avoid returning all intermediate material indefinitely. Uncontrolled recycling can increase circulating load and make the plant unstable.
Hard-rock cassiterite must be released from its host rock before effective separation.
A jaw crusher may provide primary crushing. Further size reduction and screening should be selected according to ore competence, liberation and the required downstream feed.
Where testing supports recovery at a relatively coarse size, remove liberated cassiterite before additional grinding.
Conceptual route:
Ore → Staged crushing and screening → Early gravity recovery where suitable → Selected streams to grinding → Classification → Fine recovery
Screen oversize should return to the appropriate crushing stage or follow another defined treatment route. It should not disappear from the flowsheet.
A ball mill may be evaluated for material requiring further liberation. Its duty should be considered together with classification and downstream recovery, rather than selected around an arbitrary grinding target.
In a closed grinding circuit:
The objective is sufficient liberation with controlled fines generation.
Regrinding should address a demonstrated liberation problem. Check whether tin in the middlings occurs as locked cassiterite, liberated grains or another mineral form before selecting further treatment.
A finer grind may improve liberation while increasing the difficulty of gravity recovery. Evaluate the combined result rather than the grinding stage alone.
Fine cassiterite should be assessed as a defined recovery duty rather than treated as an extension of the coarse gravity circuit.
A size-by-size investigation should establish where tin losses occur and whether they are caused by poor liberation, separation limitations or feed preparation.
Potential options include:
Cassiterite flotation and sulfide flotation serve different purposes. Cassiterite flotation aims to recover tin-bearing oxide mineral particles. Sulfide flotation may recover associated sulfides or remove them from a stream before subsequent tin treatment.
They require different evaluations and should not be represented as one generic flotation step.
Where flotation is justified, select the flotation equipment together with conditioning, reagent addition, water quality and cleaning requirements.
Flotation should not be added solely because the feed is fine. Its contribution must be demonstrated against the alternative routes.
A gravity concentrate may contain cassiterite together with iron minerals, sulfides, tungsten minerals or tantalum–niobium minerals. Further cleaning should target the actual separation problem.
Magnetic separation may help separate associated minerals with different magnetic responses. Equipment and operating conditions should follow concentrate testing. Neither the magnetic nor the non-magnetic product should automatically be treated as finished tin concentrate; both require analysis.
Electrostatic separation may be evaluated for suitable dry, sized material where electrical response provides a useful separation. Feed moisture, surface condition and particle-size distribution are part of the selection process.
Associated valuable minerals may justify separate products. Where cassiterite occurs with columbite–tantalite, the tantalum niobium ore processing solution provides related recovery and upgrading considerations. The final sequence must still be established for the actual mixed concentrate.
A higher tin grade does not always produce the best project outcome.
Additional cleaning can reduce recovery, increase processing cost or create a product that offers little additional payable value.
Confirm the intended buyer’s requirements for:
Potentially troublesome constituents depend on the deposit and buyer. Include the relevant analyses in the test program rather than relying on a single tin assay.
Evaluate grade and recovery together using a consistent reporting basis. Stage recovery describes an individual treatment step, while overall recovery describes the proportion of tin in the original feed reaching the intended final product.
A high cleaner-stage recovery does not establish a high overall plant recovery. Assess feed, products, circulating streams and losses together.
Concentrate dewatering should match the product requirements and any subsequent treatment.
Depending on the solids and required moisture, the arrangement may include settling, thickening or filtration. Filtration tests help define equipment duty and cake handling.
Filter cake may be suitable for storage or dispatch after dewatering. If dry magnetic or electrostatic separation is required, additional drying and feed preparation may be necessary.
Conceptual arrangement:
Wet concentrate → Dewatering → Product handling
Optional branch: Dewatered concentrate → Drying as required → Dry separation → Separate products
Mineral slurry is generally transferred through suitable pumps and pipes. Dewatered cake requires a separate handling arrangement, which may involve bins, chutes or dedicated conveying equipment.
A conceptual flowsheet can use labelled arrows to indicate solid transfer without implying a particular conveyor layout.
Collected water should be assessed before reuse. Suspended fines and dissolved constituents may affect washing, gravity separation or flotation.
Coarse gravity rejects, fine tailings and slimes may also need different handling arrangements. Check their residual tin content before disposal and assess the settling, dewatering and storage requirements of each stream.
Plant capacity is not defined by the raw-feed tonnage alone.
Clay, water demand, fine solids and circulating material can create very different equipment loads for ores treated at the same nominal rate.
| Process Duty | Equipment to Evaluate | Design Information Required |
|---|---|---|
| Feed control | Hopper, grizzly and feeder | Feed variability, lump size and moisture |
| Washing | Washing screen or scrubber | Clay behavior and disaggregation requirements |
| Size separation | Screens and classifiers | Required cuts and size-by-size tin distribution |
| Crushing | Primary and secondary crushers | Competence, abrasiveness and target product size |
| Grinding | Mill and classification equipment | Liberation, grindability and circulating load |
| Gravity recovery | Jigs, tables or centrifugal concentrators | Recovery response by size fraction |
| Concentrate cleaning | Gravity, magnetic, electrostatic or flotation equipment | Product composition and separation tests |
| Dewatering | Thickener, filter and associated pumps | Settling, filtration and cake properties |
| Water management | Collection tanks, clarification and return pumps | Water balance and reuse quality |
Equipment selection should account for normal operation, expected feed changes and maintenance access.
Avoid treating the largest catalogue capacity as the expected operating capacity for the project.
Provide the available information below to define the initial scope:
A preliminary proposal should state the proposed route, equipment duties, utility assumptions and outstanding testwork.
Recovery and concentrate-quality targets should be based on representative testing under defined feed conditions.
Can the same plant process alluvial and hard-rock tin ore?
Some equipment may be shared, but feed preparation differs. Alluvial ore may need washing and classification, while hard-rock ore usually requires crushing and may need grinding.
Does alluvial tin ore need a ball mill?
Not necessarily. Grinding is only needed where valuable minerals remain locked and testing supports further liberation.
Can gravity separation produce a saleable tin concentrate?
It may do so for suitable feed. Mixed heavy-mineral concentrates may require additional cleaning to meet buyer specifications.
Can fine tin be recovered from slimes or tailings?
Potentially. Size-by-size assays and recovery tests are needed to assess suitable methods and economic viability.
Is concentrate drying always required?
No. Drying depends on the buyer’s moisture requirements and whether downstream dry separation is needed.
Share your ore type, available analysis, target capacity and concentrate requirements.
These details provide a starting point for evaluating the processing route, matching equipment and identifying the testwork needed before final design.
Contact LIPU to discuss a preliminary flowsheet and equipment proposal.
We provide a variety of mining and processing equipment, including feeders, rock crushers, grinders, classifying and screening machines, washing machines, gravity separators, flotation machines, magnetic separators, electric separators, dewatering equipment and laboratory mineral processing equipment.
