A method and equipment for enrichment of waste rare earth fluorescent powder and comprehensive utilization of waste heat
A technology of rare earth phosphors and waste heat, which is applied in the field of resource recycling and reuse, can solve the problems that silicon elements cannot be completely removed and unfavorable for the complete recovery of rare earths, etc., and achieve the effects of improving the recovery rate of rare earths, making the process environmentally friendly and clean, and reducing recycling costs
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Embodiment 1
[0023] The waste rare earth phosphors are roasted in a roller kiln. The roasting temperature is 400°C, the advancing speed is 0.5m / min, the length of the roasting zone is 10m, the length of the cooling zone is 5m, and the exit temperature is 200°C. After roasting, it is conveyed through vibrating screening-gravity air separation dual-mode physical sorting, and co-processed in a coordinated manner. The vibrating screen and the collection tank are at 10° to the horizontal. A blast pipe is placed 10cm above the vibrating screen. The air outlet is in the horizontal direction. The connection between the high inclined end of the vibrating screen and the container wall is an inclined plane. At the same time, the waste heat of roasting and the waste heat released by the material during the air selection process are collected by the negative pressure device for heating the acid hydrolyzate. The purity of rare earth phosphors obtained by the above-mentioned sorting method is 96.37%, the...
Embodiment 2
[0025] The waste rare earth phosphors are roasted in a roller kiln. The roasting temperature is 500°C, the advancing speed is 1m / min, the length of the roasting zone is 15m, the length of the cooling zone is 6m, and the exit temperature is 180°C. After roasting, it is conveyed through vibrating screening-gravity air separation dual-mode physical sorting, and co-processed in a coordinated manner. The vibrating screen and the collection tank are at 20° to the horizontal. A blast pipe is placed 15cm above the vibrating screen. The air outlet is in the horizontal direction. At the same time, the waste heat of roasting and the waste heat released by the material during the air selection process are collected by the negative pressure device for heating the acid hydrolyzate. The purity of rare earth phosphors obtained by the above-mentioned sorting method is 97.25%, the impurity silicon content is less than 2%, the purity of glass slag on the sorting screen is 94.15%, the loss rate o...
Embodiment 3
[0027] The waste rare earth phosphors are roasted in a roller kiln. The roasting temperature is 600°C, the advancing speed is 1.5m / min, the length of the roasting zone is 20m, the length of the cooling zone is 7m, and the exit temperature is 160°C. After roasting, it is conveyed through vibrating screening-gravity air separation dual-mode physical sorting, and co-processed in a coordinated manner. The vibrating screen and the collection tank are at 30° to the horizontal. A blast pipe is placed 5cm above the vibrating screen. The air outlet is in the horizontal direction. The connection between the high inclined end of the vibrating screen and the container wall is an inclined plane. At the same time, the waste heat of roasting and the waste heat released by the material during the air selection process are collected by the negative pressure device for heating the acid hydrolyzate. The purity of rare earth phosphors obtained by the above-mentioned sorting method is 96.83%, the ...
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