Multi-functional upper expanding device for producing antimony trioxide

A multi-functional upper expanding device for producing antimony trioxide comprises an inlet pipe, an abdomen pipe, and an air exhausting pipe, wherein the inlet pipe, the abdomen pipe and the air exhausting pipe are orderly connected and communicate with each other; the inner diameter of the abdomen pipe is larger than those of the inlet pipe and the air exhausting pipe; the inlet end of the inlet pipe is arranged on the outlet end of the antimony trioxide reaction chamber, and the outlet end of the air exhausting pipe is connected to the inlet end of the antimony trioxide crystallization device. The multi-functional upper expanding device can adjust the particle size of antimony trioxide product at will, effectively controls the antimony trioxide product quality, timely recycles the agglomerated oxides generated during the antimony trioxide production process, and improves economic and technical indexes such as product yield, and the like.