Quartz stone processing with small jaw crusher tutorial
Quartz stone features high hardness (Mohs 7), strong abrasion resistance. Small jaw crusher is widely used for primary coarse crushing of quartz blocks in small‑scale processing plants, laboratories and mini production lines. This tutorial covers material properties, equipment selection, pre‑check, operation steps, parameter adjustment, common faults, maintenance and safety notes.
1. Equipment & material preparation
Suitable small jaw crusher models
- Feed opening range: 100×150, 150×250, 200×300 small lab / mini production jaw crusher
- Recommended motor power: 3‑11 kW
- Feed size requirement: raw quartz block shall be less than 80% of the machine feed opening maximum dimension
- Discharge adjusting range: 10‑40 mm (coarse crushed quartz output for secondary milling / fine crushing)
Raw material requirements
- Quartz lump: remove surface mud, iron impurities and soft gangue in advance
- Max feeding lump size: do not exceed 80% of feed port; oversize blocks need pre‑breaking
- Moisture: material moisture＜8%; wet sticky quartz may block crushing chamber
- Remove metal fragments, iron nails, drill bits to avoid jaw plate damage
Auxiliary tools
Iron remover / magnetic separator, sieve set, feeler gauge (for discharge gap calibration), spanner set, dust mask, safety goggles, vibration feeder (optional).
2. Pre‑operation inspection
- Check fastening bolts: toggle plate, jaw plates, flywheel, bearing housing must be tightly locked; no loose parts.
- Check wear condition: fixed jaw plate and movable jaw plate, toggle plate shall not have deep cracks or serious pitting.
- Lubrication check: bearing parts fill with correct lithium‑based grease, not overfilled.
- Rotate flywheel manually for several turns: confirm no jamming, friction or abnormal collision inside crushing chamber.
- Check motor wiring, grounding protection; ensure rotating direction matches marking.
- Install iron remover above feeding hopper to capture accidental iron mixing.
- Adjust discharge gap to target output size (for quartz coarse crushing: usually 15‑30 mm).
Tip: Quartz is highly abrasive. Worn jaw plates will sharply reduce production capacity and increase particle size fluctuation. Replace liners in time.
3. Step‑by‑step processing operation
Step 1: Start‑up sequence
Start the jaw crusher first, run no‑load for 3‑5 minutes. Observe vibration, noise, flywheel rotation. Only after stable no‑load operation can feeding begin. Never feed material before machine reaches full speed.
Step 2: Feeding quartz material
- Adopt even, continuous feeding; avoid heap‑feeding and blocking the hopper fully.
- Quartz lumps fall naturally into crushing chamber, do not push raw material by hand into the cavity.
- Keep material in the middle of crushing chamber; avoid side‑biased feeding which causes uneven jaw‑plate wear.
- If equipped with small vibration feeder, set moderate feeding speed for steady throughput.
Step 3: Crushing & output monitoring
- Observe discharging size frequently. If output becomes coarser, check jaw‑plate wear and discharge gap.
- Watch current reading: keep motor working current below rated value. Over‑current means over‑feeding or cavity blockage.
- Collect discharged coarse quartz, send to vibrating screen for classification. Oversized material can be re‑circled back for re‑crushing.
Step 4: Shutdown sequence
- Stop feeding raw quartz first.
- Run the crusher until all quartz inside crushing chamber is completely discharged.
- Then cut off motor power.
Critical rule: Do not shut down while crushing chamber still holds quartz lumps, will cause difficult restart.
4. Parameter adjustment for quartz crushing
- Discharge gap adjustment: adjust by shim sets behind toggle seat. Use feeler gauge to measure gap between movable‑jaw and fixed‑jaw lower end.
- For quartz coarse product (15‑30 mm): larger gap, higher capacity, more coarse particles.
- For finer coarse output (8‑15 mm): narrow gap; note that quartz high abrasion will accelerate jaw‑plate wear, throughput drops.
- Do not set gap too small: high risk of cavity blocking and toggle‑plate overload fracture.
5. Frequent problems in quartz processing & solutions
表格
| Problem | Possible reason | Solution |
|---|---|---|
| Large vibration & loud impact noise | Loose foundation bolt, worn toggle plate, uneven feeding | Tighten bolts; inspect toggle plate; optimize feeding method |
| Output size becomes suddenly coarse | Severely worn jaw liners | Adjust gap or replace jaw plates |
| Crushing chamber blockage | Wet material, over‑feeding, too small discharge gap | Stop feeding, power off then clean cavity; increase discharge gap; dry raw quartz |
| Motor over‑current | Overload feeding, hard unbreakable foreign object inside cavity | Reduce feeding rate; install iron removal device |
6. Routine maintenance (critical for quartz high‑abrasive working condition)
- Daily: check jaw‑plate wear, bolt tightness, abnormal noise and vibration; clean accumulated quartz dust.
- Every 8‑10 working hours: inspect bearing temperature (shall be＜70 ℃), replenish grease.
- Periodically: check toggle plate and toggle seat abrasion; replace jaw plates when wear depth exceeds 1/3 thickness.
- Clean flywheel grooves from quartz powder buildup.
- Check foundation anchor bolts regularly; high quartz‑crushing vibration tends to loosen bolts.
7. Safety precautions
- Strictly prohibit hands into crushing hopper while machine running; use long‑rod tools for blockage clearing after power‑off.
- Wear dust‑proof and eye‑protection equipment, quartz powder is harmful to respiratory tract.
- Lockout‑tagout procedure during maintenance and cavity cleaning.
- Do not crush metal, high‑strength alloy pieces mixed in quartz ore.
8. Process downstream suggestion
Small jaw crusher only performs primary coarse crushing for quartz. Discharged 10‑30 mm quartz particles usually go to hammer mill / roller mill for fine grinding to obtain sand‑grade quartz product.