Fluorite sorting generates massive fine mineral dust. Dust deposited on optical lenses, background plates, jet valves, circuit boards and other components reduces recognition accuracy, clogs nozzles, accelerates aging of electrical parts and impairs stable equipment operation. Dust control for fluorite color sorters requires coordinated measures including upstream material pretreatment, full machine sealing protection, matched dust removal system, routine inspection & maintenance and workshop environment management to minimize mineral dust entering the core chamber and ensure stable sorting performance.

Implement upstream material pretreatment to reduce dust at source. Before fluorite feed enters the color sorter, install screening and de-dusting processes. Use trommel screens or vibrating screens to separate fine powder attached to ore surfaces in advance. Maintain raw material moisture within a proper range. Over-dry materials aggravate dust emission while excessive moisture causes sticking on chutes and hoppers, forming lumps that fall off and continuously generate dust. Add buffer structures at feeding points to reduce impact from falling ore and associated dust. Fit dust-proof soft curtains at feed inlets to block outward dust diffusion and lower the chance of floating mineral dust entering the sorting chamber. Remove large foreign objects from raw materials beforehand to prevent shell damage and broken sealing caused by hard objects hitting material channels.

Carry out equipment sealing and chamber protection. Inspect sealing strips on machine doors, access ports and observation windows of the color sorter. Aged, cracked or fallen strips create passages for dust ingress and shall be replaced promptly. Fill sealing materials at cabinet joints, cable penetrations and air pipe inlets to seal gaps. The sorting chamber and optical bin are key dust-proof areas; keep them closed and avoid opening access doors arbitrarily during operation. Wear-resistant plates are adopted for feed chutes, passages and discharge hoppers to reduce secondary dust from abrasion. Repair holes caused by wear in a timely manner to prevent mineral dust leakage. Fit automatic ash cleaning assemblies on optical windows to reduce direct dust accumulation on protective glass and avoid extra interference from frequent manual wiping.

Equip independent dust removal system to build negative pressure dust collection. Fluorite color sorters shall be connected to external dust extraction fans to form slight negative pressure inside the sorting chamber, so as to extract floating mineral dust in time and prevent dust accumulation near optical lenses and background plates. Arrange dust pipelines reasonably and minimize sharp bends to avoid dust deposition and pipe blockage. Inspect dust filter bags and cartridges regularly. Clogged cartridges reduce air volume and weaken dust removal effect. Clean or replace them periodically according to dust load. Link fan start-stop with host operation: activate dust removal synchronously when the machine starts and delay fan shutdown after halt to exhaust residual dust in the chamber. Keep dust extraction fans running during chamber cleaning to prevent dust from spreading to optical components during blowing.

Standardize dust protection for pneumatic systems. Compressed air supplies power for the jet rejection mechanism of color sorters. Dust and moisture in air sources will block nozzles. Install filters and dryers behind air compressors for multi-stage purification of compressed air and drain water from filters each shift. Disassemble jet nozzles regularly and perform reverse purging with compressed air to clear fluorite powder deposits and avoid abnormal rejection action caused by blocked orifices. Protect air pipe joints against dust to stop external dust entering solenoid valves through pipe interfaces.

Establish tiered cleaning and inspection maintenance system. Formulate shift-based cleaning plans. After each shutdown, blow hoppers, vibratory feeders, slides and discharge chutes with compressed air to clear residual mineral powder. Gently wipe optical protective glass and background plates with dust-free cloth and anhydrous alcohol. Hard tools are forbidden to scratch glass surfaces. Inspect sealing strips and dust pipelines for damage daily; check ash cleaning brushes and negative pressure suction ports weekly to remove accumulated dust; de-dust electric control cabinets and cooling filter screens monthly to prevent circuit board overheating from dust buildup. Keep electric control cabinets sealed and fit dust filter screens on ventilation openings to block mineral dust entering electrical bins. Cut off power before cleaning. Do not aim air guns directly at optical lenses or nozzle interiors during purging.

Optimize overall workshop environment to lower ambient dust concentration. Zone the area for color sorting equipment. Fit the workshop with an overall dust removal system to control suspended dust concentration. Keep the area around equipment tidy and sweep scattered fluorite powder promptly to avoid secondary dust. Implement dust suppression on workshop floors to reduce dust stirred up by personnel and vehicle movement. Position equipment away from dust airflows to prevent mineral dust from other processes drifting continuously toward the optical bin of color sorters.

Maintain fault records and implement preventive component replacement. Record dust deposition positions and clogging conditions in each maintenance, analyze dust ingress paths, and optimize sealing or dust removal air volume accordingly. Seals, dust filter cartridges and ash cleaning brushes are consumable parts. Prepare spare parts in advance per service cycle and replace them timely when performance degrades. Install dust covers on optical windows, nozzles and electric control cabinets during long-term shutdown to prevent dust accumulation in standby status.

Dust control for fluorite color sorters relies on upstream raw material de-dusting, chamber sealing protection and negative pressure dust removal systems, together with standardized phased cleaning and inspection. It reduces mineral dust entering core optical and pneumatic parts, lowers failures such as lens contamination and nozzle blockage, maintains stable color sorting recognition and extends service life of equipment components.