Closed hydrogen chloride tail gas recovery treatment device

The utility model provides a closed hydrogen chloride tail gas recovery treatment device, and relates to the technical field of tail gas treatment. The device comprises a shell, a first porous filter plate, a first Raschig ring, a second porous filter plate, a second Raschig ring, an alkali liquor absorption tank, a buffer mechanism, an alkali liquor spray head and the like. The tail gas inlet is formed in the bottom of the shell, the gas outlet is formed in the top of the shell, and tail gas flows from bottom to top. Tail gas passes through the first Raschig ring, the second Raschig ring and alkali liquor spraying in sequence, impurities in the tail gas are fully filtered out, and it is guaranteed that hydrogen chloride gas is fully absorbed and then discharged. Meanwhile, a buffer mechanism is arranged between the alkali liquor absorption tank and the second porous filter plate, so that the flowing time of the tail gas is prolonged, on one hand, the tail gas is fully filtered, on the other hand, the tail ga