The indissoluble calcium sulfite can be removed from the circulating water by the way of precipitated separation and dissolvable sodium hydroxide can be recycled.

• 通过沉淀分离可将难溶的亚硫酸钙从循环水中清除,氢氧化钠易溶于水可循环使用,脱硫过程只消耗氢氧化钙。