Abstract:The 32m2 fuming furnace introduced in this paper is now the largest one in the world. In this paper, the design difficulties faced by fuming furnace upsizing are analyzed, and the final solution is given. The smooth operation and application of 32m2 fuming furnace verified the success of the upsizing design. At the same time, it is believed that fuming furnace enlargement will become a trend, where more and more large fuming furnaces will be applied.