Hydrofluoric acid method is that we add the hydrofluoric acid in quartz, feldspar slurry. Glide-slope hopper is often seen in mining process. The primary hopper is in trapezoid with gradient for 30, length for 1.6m. Dropping height of furnace slag is from 3m to 3.5m. Particle size of furnace slag is smaller than 500mm.
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