bentonite mining process in nairobi kenya mill grinding attachments

Bentonite mining in Nairobi, Kenya, involves several stages, from extraction to processing, including grinding using mills with specialized attachments. Here’s an overview of the process and the role of grinding equipment:

1. Bentonite Mining Process in Kenya

Exploration & Extraction

• Location: Bentonite deposits in Kenya are found in regions like Magadi, Kajiado, and parts of Nairobi’s outskirts.
• Mining Method: Open-pit mining is commonly used due to shallow deposits.
• Extraction: Bulldozers and excavators remove overburden before bentonite clay is extracted.

Processing Stages

1. Drying (if high moisture content) – Sun drying or industrial dryers may be used.
2. Crushing – Primary jaw crushers reduce large chunks into smaller pieces.
3. Grinding – Fine grinding is done using mills (e.g., Raymond mill, ball mill) to achieve desired particle size.
4. Activation (if required) – Sodium or calcium activation modifies properties for industrial use.
5. Packaging – Processed bentonite is bagged for local or export markets.

2. Mill Grinding Attachments for Bentonite

For efficient grinding, different milling systems are used:

• Raymond Mill: Common for fine powder (80-400 mesh), suitable for non-metallic minerals like bentonite.
• Ball Mill: Used for wet or dry grinding; produces ultra-fine particles when paired with classifiers.
• Vertical Roller Mill (VRM): Energy-efficient option for large-scale production.
• Hammer Mill: For coarse-to-medium grinding before finer milling.

Key Grinding Considerations

• Moisture Control: Bentonite’s swelling properties require controlled drying before grinding.
• Particle Size Adjustment: Classifiers or sieves ensure uniform fineness based on application (e.g., drilling mud, cosmetics).
• Wear Resistance: Mills must have abrasion-resistant linings due to bentonite’s abrasive nature.

3. Bentonite Applications in Kenya

Processed bentonite is used in:

• Construction (cement, waterproofing)
• Oil & gas (drilling mud)
• Agriculture (soil conditioner)
• Cosmetics & pharmaceuticals

4. Challenges in Kenya’s Bentonite Mining

• Limited advanced processing facilities locally.
• High transportation costs from remote mines.
• Competition from imported bentonite.



5. Equipment Suppliers in Nairobi

Grinding mills and attachments can be sourced from:

• Local manufacturers (e.g., Rift Valley Machinery)
• International suppliers (Chinese mills like Shanghai Clirik or Liming Heavy Industry).
• Industrial auctions or used equipment dealers.

Would you like details on specific mill models or bentonite activation processes?