Tips to increase cone crusher throughput for willemite 70 tph in Namibia

For zinc mining operations in Namibia – particularly in the Otavi Mountainland and Rosh Pinah regions – willemite (Zn₂SiO₄) is a key ore mineral. Willemite is moderately hard (Mohs 5.5‑6) and can be abrasive when associated with quartz or other hard gangue. A cone crusher operating at 70 tph is a common choice for secondary or tertiary crushing. However, throughput often falls short of design due to suboptimal settings, feed issues, or liner wear. Applying proven tips to increase cone crusher throughput for willemite 70 tph in Namibia can boost production by 10‑20% without major capital investment. OCP Mechanical Company, a factory‑direct manufacturer with over 40 years of experience, supplies Type C cone crushers for African hard rock, backed by 24/7 online support.

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Optimize closed side setting (CSS) and feed grading

The most effective tip to increase cone crusher throughput for willemite 70 tph in Namibia is to adjust the closed side setting (CSS). A wider CSS increases throughput but produces coarser product. For secondary crushing of willemite, a CSS of 16‑25 mm is typical. Widening CSS by 2‑4 mm can increase throughput by 12‑18% with only a small increase in product size. If the downstream mill has spare capacity, this is a quick win. Additionally, feed gradation matters. A well‑graded feed (mix of coarse, medium, and fine) flows through the crusher more efficiently than a feed that is all coarse. Remove fines (<80% of CSS) before the cone crusher using a screen; this reduces packing and increases net throughput by 10‑15%. Many Namibian zinc operations have gained 15% more throughput simply by adjusting CSS and installing a pre‑screen.

Maintain choke‑fed condition and even feed distribution

Another critical tip to increase cone crusher throughput for willemite 70 tph in Namibia is to keep the crushing chamber full (choke‑fed). A starved crusher loses capacity because the crushing cavity is not fully utilized. Use a level sensor in the feed hopper to automatically adjust the feeder speed. Uneven feed distribution (material entering on one side only) reduces effective capacity by 20‑30%. Install a spreader chute or a rotating distributor plate to spread material evenly across the entire circumference of the crushing chamber. Many Namibian operations have increased cone crusher throughput by 12‑18% after correcting feed distribution issues.

Monitor and maintain liner wear profile

As liners wear, the cavity profile changes, and throughput tends to decrease. A practical tip to increase cone crusher throughput for willemite 70 tph in Namibia is to measure liner wear every 200 hours using a profile gauge. When the wear reaches 50‑60% of original thickness, schedule a liner change. Do not wait for the liners to become completely worn; new liners restore the original cavity geometry and immediately increase throughput by 5‑10%. Also, consider using Mn18%+Cr liners for willemite with high quartz content – they maintain their profile longer than Mn14%, extending high‑throughput periods.

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Adjust eccentric speed and use VFD

Cone crusher throughput is sensitive to eccentric speed. For willemite, a higher speed (e.g., 850‑950 rpm) increases fines generation but also increases throughput. However, too high a speed may cause packing. A variable frequency drive (VFD) allows you to find the optimal speed for your specific ore. One of the most effective tips to increase cone crusher throughput for willemite 70 tph in Namibia is to test speed in 20‑rpm increments. Start at 800 rpm, measure throughput and product size, then increase to 850 rpm. Many operations have found a 5‑8% throughput gain with a moderate speed increase, without excessive wear. Additionally, a VFD saves 8‑12% on electricity.

Improve screen efficiency in closed circuit

If your cone crusher operates in closed circuit with a screen, screen efficiency directly affects throughput. A partially blinded screen increases recirculating load, which can exceed 250% and choke the crusher. Use polyurethane screen panels for the fine deck – they resist blinding from moist willemite fines. Increase screen slope from 18° to 22° to move material faster. Install water sprays to wash fines through. A well‑tuned screen can reduce recirculating load from 250% to 180%, effectively increasing crusher throughput by 15‑20% without changing crusher settings.

Optimize feed moisture and tramp protection

Willemite can absorb moisture, especially during Namibia’s rainy season. Wet feed reduces throughput by causing packing and increasing recirculation. If possible, stockpile and drain material before crushing. For dry, dusty feed, use dust suppression water sprays – but avoid over‑wetting. Install a metal detector and magnetic separator to prevent tramp iron from entering the crusher. Tramp metal can cause the crusher to stall or activate tramp release, both of which reduce throughput. In Namibian mines, tramp iron incidents are a common cause of unplanned downtime.

Why OCP is your partner for cone crusher optimization in Namibia

Applying these tips to increase cone crusher throughput for willemite 70 tph in Namibia requires both operational discipline and a crusher that responds to adjustments. OCP Mechanical Company has four decades of experience in cone crusher technology for the African mining industry. Our 24/7 online team helps with CSS tuning, feed distribution, liner selection, and VFD programming. We keep common cone liners, hydraulic parts, and VFD components in our regional warehouse for fast delivery to Namibia. We invite you to request a no‑obligation consultation to identify the best opportunities for your plant.

For a no‑obligation assessment or to learn more tips to increase cone crusher throughput for willemite 70 tph in Namibia, simply click the live chat icon on this page. Our online customer service team is available 24 hours a day, 7 days a week, to provide free technical advice, equipment recommendations, and performance optimization support – helping you crush willemite more efficiently and profitably.