Guide to using a grizzly feeder for bauxite 180 tph

1. Understand Bauxite Characteristics and Grizzly Role
Bauxite is a soft to medium-hard ore (Mohs 2-3) but can be sticky when wet, especially in tropical regions like Brazil and Guinea. When following this guide to using a grizzly feeder for bauxite 180 tph, the primary goal is to remove fines (-30mm) before the primary crusher (usually a jaw or impact crusher). A vibrating grizzly feeder (Type VGF) uses tapered grizzly bars to scalp undersize material, reducing wear on the crusher and improving overall plant efficiency. For bauxite at 180 tph, proper feeder operation can lower energy consumption by 10-15% and extend jaw plate life by 20-30%. *Actual performance depends on bauxite moisture (typically 5-15%), clay content, and feed uniformity. Always test your material or consult OCP engineers.*

2. Setting the Right Grizzly Gap and Speed
A key part of this guide to using a grizzly feeder for bauxite 180 tph is adjusting the grizzly bar spacing and feeder speed. For bauxite, set the grizzly gaps at 50-70mm – this allows most fines and small lumps to pass through, while larger boulders (above 80-100mm) are fed into the crusher. If your bauxite is wet and sticky, use wider gaps (80-100mm) to prevent clogging. The feeder stroke should be 6-8mm at a frequency of 700-850 rpm – lower than for hard rock to avoid bouncing wet lumps. OCP’s Type VGF-180 feeder features adjustable grizzly bars and a variable frequency drive, allowing operators to fine-tune these settings. *Production data are based on typical bauxite (density 1.2-1.6 t/m³, moisture 10%). For latest parameters, contact our 24/7 support.*

3. Preventing Buildup and Bridging
Sticky bauxite can adhere to grizzly bars and feeder pan, reducing open area and causing material bridging. In this guide to using a grizzly feeder for bauxite 180 tph, follow these anti-clogging measures:

• Install polyurethane or rubber liners on the feeder pan – bauxite slides more easily than on steel.

• Use self-cleaning grizzly bars with tapered or stepped profiles – they shed sticky material better than flat bars.

• Add a heated or vibrating backplate in extremely wet conditions (moisture >15%).

• Keep the hopper above the feeder at 60-65° angle – steeper than standard rock hoppers.
  OCP Mechanical Company offers optional air cannons and electric vibrators mounted on the grizzly section to dislodge buildup automatically.

4. Optimizing Feed Distribution for 180 tph
To consistently achieve 180 tph, the feeder must receive a uniform, controlled flow from the hopper. Use a variable-speed belt feeder or apron feeder ahead of the grizzly if the material surge loads are high. The grizzly feeder itself should be choke-fed – always keep material covering the grizzly bars to prevent direct impact damage. Monitor the amperage draw of the feeder motor: for bauxite, a 15-22 kW motor should run at 70-80% of rated load at 180 tph. If amperage spikes, reduce feed rate or increase grizzly gap. Many Brazilian and Guinean bauxite operations successfully use a two-step feeding system: a heavy-duty apron feeder (Type A-120) feeding the vibrating grizzly. Machine efficiency and cost-effectiveness are our design goals, but actual throughput depends on operator skill and material consistency.

5. Maintenance Tips for Long Grizzly Life
Proper maintenance is the final part of this guide to using a grizzly feeder for bauxite 180 tph:

• Inspect grizzly bars weekly for wear or bending – replace bars when the gap increases by 20% from original.

• Check rubber isolators (springs) every month – worn springs alter vibration amplitude, reducing conveying speed.

• Lubricate eccentric bearings every 200 hours with high-quality grease (Type L-2).

• Clean the discharge chute daily – bauxite fines can harden like cement if left overnight.

OCP Mechanical Company, with over 40 years of history, designs grizzly feeders that are highly reliable for sticky bauxite applications. As a direct manufacturer (no middlemen), we offer cost-effective pricing and fast spare parts delivery to Brazil and Guinea. Our Type VGF-180 is widely used for 150-200 tph bauxite operations. We also provide free remote consulting on grizzly bar spacing, feeder speed, and hopper geometry. Prices shown are for reference only – final quotes depend on feeder size, options, and shipping. OCP reserves the right to update technical data without prior notice.

Need a customized feeding solution for your bauxite plant? Our customer service team is online 24/7 – click the chat button for free quote, grizzly bar selection advice, or a complete plant layout. Let OCP help you maximize bauxite crushing efficiency at 180 tph.