Phosphorus pentasulfide automatic feeding device

The utility model relates to an automatic phosphorus pentasulfide feeding device, which belongs to the technical field of arsenic removal process in phosphoric acid production, and is characterized in that a feeding bin is arranged at the top of a stock bin, materials enter the feeding bin from a top feeding pipe, the bottom of the feeding bin is connected with the stock bin through flexible connection, and a weighing module is arranged beside the stock bin. The material bin is connected with a weighing system and is connected with a spiral discharging bin through a discharging pipe, a spiral conveying roller is arranged in the discharging bin, materials are spirally conveyed into a preparation tank, a pure water inlet pipe is arranged at the top of the preparation tank, an air outlet pipe is arranged at the top of the preparation tank, and the air outlet pipe is connected with a tail gas washing tower; according to the automatic phosphorus pentasulfide feeding device, DCS interlocking automatic control is ad