Correct Operating Procedures and Maintenance Methods for Spiral Classifiers

The spiral classifier is one of the mineral processing equipment. It operates on the principle that solid particles with different specific gravities settle at varying speeds in a liquid, enabling mechanical classification. This equipment filters the powder ground in the mill, returns coarse material via spiral blades to the mill feed inlet, and discharges the filtered fine material through the overflow pipe.

Commonly abbreviated as a classifier, this equipment primarily includes four types: high-weir single-spiral, double-spiral, submerged single-spiral, and double-spiral classifiers.

The spiral classifier is widely applicable in mineral processing plants for closed-circuit circuit classification and diversion of ore sand in conjunction with ball mills. It is also used in gravity separation plants for classifying ore sand and fine slime, as well as for particle size classification of pulp in metal ore processing flows. Additionally, it serves in desliming and dewatering operations during ore washing. It features a simple structure, reliable operation, and convenient handling.

Operational details for the spiral classifier:

1. Slurry feeding may commence only after the spiral shaft has started rotating, gradually increasing the feed rate.

2. During operation, if an emergency occurs (e.g., jamming or overload requiring immediate shutdown), lift the spiral shaft out of the slurry surface immediately. Never allow the spiral shaft to remain submerged in slurry. Promptly open the discharge valve to prevent blockage.

3. When restarting, lower the screw shaft to a designated position before rotating it.

4. To stop the machine during operation, first cease feeding. Only after the material grading process is complete and no material remains inside should the machine be shut down.

Maintenance Methods for the Screw Classifier:

1. Lubricate all lubrication points with sodium-based or calcium-based grease.

2. Check the lubricant level in the reducer daily to ensure it remains at the oil gauge mark. Change the oil every 6 months.

3. Regularly inspect the lower support or intermediate frame bushings, bearings, and seals for wear, and check the bushings for damage to ensure timely replacement.

4. Bearing lubrication requires manual high-pressure oil injection every 4 hours using a dry grease pump to maintain bearing seal integrity.

The above covers key aspects of screw classifiers. We hope this information proves helpful. You are welcome to visit OCP for an on-site inspection of our facilities and crushing equipment, or to consult on crushers and related auxiliary equipment! Click the website chat icon for immediate free consultation.