Abstract:As one of the most important sections in Bayer process, the multi-effect evaporation process has more equipment and complex operation, and the evaporation process involves numerous variables, whose coupled relations are complicated, which brings certain challenges to the field operation. Water evaporating value and steam to water ratio (ratio of fresh steam to water evaporating value) are the important assessment indicators of evaporation process, which values directly affect the operational cost. Especially when the steam in insufficient, the evaporation effect directly affects the concentration of mother liquor, even affects the entire production process and capacity, and ultimately affects the competitiveness of the enterprise. In the real refinery, workers manage process parameters according to practice experience, which sometime cannot achieve expected goal and even arise reverse effect, restricting evaporators potential performance, and process parameters are not optimal. Based on material balance and energy balance, the equivalent physical modules of countercurrent multi-effect evaporation process for alumina production were modeled with the help of process simulation software, and the process parameters of the multi-effect evaporation process for alumina production by Bayer process were analyzed. The influences of different process parameters on the evaporation water amount (steam consumption) were explored to provide theoretical guidance for the actual operation of the evaporation process, which can achieve the purpose of energy saving and emission reduction in alumina production, and help the green and low-carbon sustainable development of alumina enterprises.