Abstract: Establishing a circular economy system taking white mud as its core in coal-fired power plants located in mud-rich areas can effectively promote the environmental protection in electricity industry and circular economy in China. However， difficulty in desulfurization slurry mass concentration control and high water content in gypsum are the problems in using white mud as desulfurizer.After theoretical study and tests，the solution is regulating the slurry mass concentration range according to the total dissolved solids （TDS） and removing the impurities in the desulfurization slurry.The study can provide reference and practical basis for white mud desulfurization in engineering cases and its large-scale application.

Key words: white mud, desulfurization, circular economy, slurry mass concentration, total dissolved solids（TDS）, impurity