| 主权项 |
1. A device for treating fluorine-containing water, comprising:
calcium carbonate packed towers configured to treat the fluorine-containing water having a fluorine concentration of 2,000 to 100,000 mg/L, arranged in series in a plurality of stages, to remove fluorine in the fluorine-containing water at a fluorine removal ratio of 90% or more and recover calcium fluoride; a first pipe connected to the calcium carbonate packed towers configured to pass the fluorine-containing water through the calcium carbonate packed towers, and having one portion connected to one of the calcium carbonate packed towers and having a first valve, and another portion connected to another of the calcium carbonate packed towers through a second valve; a raw water tank connected to the first pipe to supply the fluorine-containing water in the raw water tank to one or another of the calcium carbonate packed towers; a reaction liquid tank arranged between the calcium carbonate packed towers; a second pipe connected to the one or another of the calcium carbonate packed towers configured to extract treated water from the calcium carbonate packed towers; a treated water tank connected to the one or another of the calcium carbonate packed towers through the second pipe; a third pipe having one portion connected to the one of the calcium carbonate packed towers and having a third valve, and another portion connected to the another of the calcium carbonate packed towers through a fourth valve; a fourth pipe connected to the reaction water tank and including a portion connected to an inlet of the another of the calcium carbonate packed towers and having a fifth valve, and another portion connected to an inlet of the one of the calcium carbonate packed towers and having a sixth valve; a fifth pipe connected to the treated water tank through the second pipe, and including a portion connected to an exit of the one of the calcium carbonate packed towers and having a seventh valve, and another portion connected to an exit of the another of the calcium carbonate packed towers and having an eighth valve, wherein a volume mean diameter of calcium carbonate granules packed in the calcium carbonate packed towers is 40 to 100 μm, and the calcium carbonate granules contain granules with a particle diameter of lower than 20 μm at a ratio of 15% or lower. |
