Recovery and purification device and method for phosphoric acid from tail gases generated in chemical method activated carbon production process

The invention provides a recovery and purification device and method for phosphoric acid from tail gases generated in a chemical method activated carbon production process. The recovery and purification device comprises a phosphoric acid absorption system, an exhaust gas secondary purification system and a filtration recovery system, wherein the phosphoric acid absorption system comprises a phosphoric acid primary absorption tower, a phosphoric acid primary absorption pump, a phosphoric acid secondary absorption tower, a phosphoric acid secondary absorption pump and a circulation liquid tank; the exhaust gas secondary purification system comprises a lime water spraying absorption tower and a draught fan; and the filtration recovery system comprises a filter pump, a pressure filter and a drying tank. The recovery and purification device and method have the advantages that the tail gases are purified and recycled by adopting three-level series-connection manner, and high-concentration phosphoric ...