The successful recovery of tin ore depends not only on equipment selection but also on understanding the physical characteristics of the ore itself. Recently, Forui Machinery completed the manufacturing and shipment of a complete tin ore gravity separation plant for an African customer. The plant was designed to process weathered tin-bearing material and recover cassiterite through a combination of crushing, classification, gravity concentration, and dewatering.
The customer operates a tin mining project in Africa and required a reliable solution capable of recovering cassiterite from ore containing a significant amount of waste rock and gangue minerals. After reviewing the ore characteristics and processing objectives, our engineering team recommended a gravity separation flowsheet, which remains the most economical and environmentally friendly method for recovering coarse and medium-sized cassiterite.
Unlike flotation or chemical processing methods, gravity separation relies on the significant density difference between cassiterite and associated gangue minerals. This approach reduces operating costs, minimizes reagent consumption, and simplifies plant operation.
| ROM Tin Ore | → | Jaw Crusher | → | Double Roller Crusher | → | Screening & Classification | → | Spiral Chute Concentration | → | Shaking Table Upgrading | → | Dewatering Screen | → | Tin Concentrate |
The crushing section consists of a jaw crusher followed by a double roller crusher. The jaw crusher performs primary size reduction, while the roller crusher further liberates cassiterite particles without generating excessive slimes.
After crushing, the material is screened and classified before entering the gravity separation circuit. Spiral chutes perform the initial roughing stage by recovering the majority of heavy minerals. The rough concentrate is then upgraded using shaking tables, where the final separation between cassiterite and lighter gangue minerals is achieved.
A dewatering screen is installed at the final stage to reduce moisture content in the concentrate and improve handling efficiency prior to transportation or further processing.
Cassiterite (SnO₂) has a specific gravity of approximately 6.8–7.1, which is significantly higher than most associated gangue minerals. This large density difference makes gravity separation the preferred processing method for many tin deposits around the world.
Compared with chemical processing methods, gravity concentration offers several advantages:
For many African tin mining operations, gravity separation remains the most practical and cost-effective solution.
The processing plant shipped for this project includes:
All equipment was completed, inspected, and prepared for international shipment before delivery.
One of the most common reasons for poor tin recovery is over-grinding. Excessive crushing and grinding can generate ultra-fine cassiterite particles that are difficult to recover through conventional gravity separation.
For this reason, the crushing circuit in this project was specifically designed to achieve adequate mineral liberation while minimizing unnecessary fines generation. This approach helps maximize overall recovery and improve final concentrate grade.
Another important factor is proper classification before gravity concentration. Stable feed size distribution allows spiral chutes and shaking tables to operate more efficiently and consistently.
Forui Machinery has extensive experience in gravity separation systems for tin ore, tungsten ore, gold ore, chrome ore, manganese ore, and other heavy mineral projects. From laboratory testing and process design to equipment manufacturing and plant commissioning, our engineering team provides complete support throughout the project lifecycle.
If you are planning a tin ore processing plant and would like recommendations based on your ore characteristics, feel free to contact our engineering team for a customized solution.
Have a question, need advice, or want to schedule an appointment? We're happy to assist with any inquiries you have about our equipment and system solutions.
