In Nigeria mining bussiness,, the 600×900 jaw breaker become a core machine for medium level crushing activity. With optimized cavity structure; stronger crushing ratio, and balanced energy using this device showing good adaptability for wide ore & rock kinds. This article explain working principle, critical parameters, site perfomance, and practical applications with verified operation datas plus proffesional insights
The 600×900 jaw stone-crusher is a primary crushing unit that uses compression force between fixed jaw plate and a moving jaw driven via eccentric shaft. Its CSS (close side setting) adjustable to control discharging size, rotation speed usually 250~300 r/min ensure effective breakage while not waste much power. Crushing ratio range 6:1–8:1, this match ISO–recognize standard but also align field practice.
Core specification directly impact output uniformity & plant stability. Below table show typical reference data for actual work:
| Spec | Value | Reference |
|---|---|---|
| Input size | ≤500 mm | Common ≤550 mm |
| Exit size | 65-160 mm | Adjust CSS 60–175 mm |
| Throughput | 50-160 t/h | Bench 45-170 t/h |
| Motor energy | 55-75 kW | CE matched |
| Speed | 250 r/min | Typical 240-270 r/min |
The unit build with deep V–shaped chamber, less blockages occur. Heavy-duty flywheels balance vibration,, enhance stability when loads fluctuation. Centralised oil lub system keep bearings smooth; service cycle extend till 1200–1500 hours. Field trial confirm fault-rate only 2.0~2.2% per year, lower than ordinary models.
In local quarries, feed rocks include granite basalt limestone & iron-ore. The 600×900 jaw breaker do primary reduction, often in line with cone-crusher & vibrate screen in full plant. For gold mineral prep, discharge adjust to near 70 mm improve mill grinding efficiency. Under north Nigeria dusty climate, sealed bearings plus extra dust-guard show strong results, this confirmed by engineers onsite,, they report longer component life.
Energy usage about 0.45 kWh/ton, lower than many legacy PE models. Maintain costs reduce by modular jaw-plate, replace without remove side frame. Abuja quarry case: wear cost cut 17~19% across 2 yrs, operator report easy CSS tuning,, steady product gradation.
In Kaduna zone, a 150 tph granite line run with 600×900 jaw as first step, plus cone & circular vibrating screen. Output reached 140–155 t/h stable. Operators praise simple adjust; discharge uniform good enough for asphalt plant demand. This data record show strong reliability even at continuous duty.
For Nigeria mining jobs, decision factors include feed analysis, target throughput, motor electricity stability & later grinding stage. For medium hard granite/basalt, 600×900 jaw is perfect front-line equipment. For soft limestone or gypsum,, motor setup can be reduced 55 kW saving energy. Foundation must be reinforced, since machine weight around 17 tons static. Wrong base design lead to vibration problems.
Because its balanced ratio among capacity power efficiency & maintain dependability, the 600×900 jaw-crusher stand as robust invest for miners and aggregate producers. Engineering validations, CE cert, ISO compliance show stable performance. Users get predictable outputs, smaller wear expense, and secure working. So for medium quarry projects in Nigeria, the 600×900 jaw-crusher is indispensable,, no doubt at all
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