一种新型双碱法烟气脱硫剂的研究

Study of the novel dual-alkali flue gas desulfurization reagent

我国大型化工企业对SO2排放的控制主要采用石灰石/石膏法或MgO法。研究综合上述两种脱硫技术的优点,利用MgO、CaO与碱性固体废弃物制备了一种新型双碱法烟气脱硫剂,并对比分析了MgO与该脱硫剂在不同温度下的溶解性、不同初始浓度的硫化物对MgO水溶液与该脱硫剂水溶液pH值的影响。结果表明:在常温条件下,含硫废水中硫化物的初始浓度越低,MgO和该脱硫剂与硫化物的反应速率越快,且在3 min之内,该脱硫剂与硫化物几乎反应完全,是一种高效的烟气脱硫试剂。

Limestone/gypsium or MgO is predominantly used by large chemical sectors for control of SO2 emission in China.By incorporating the special merits of the above-mentioned two technologies,a novel dual-alkali desulfurization reagent prepared with MgO,CaO and some basic solid waste is developed.The effect of temperature on solubility of MgO and the novel desulfurization agent,and the effect of initial concentration of sulfides on pH value of aqueous solutions of MgO and the novel agent are explored through comparison and analysis.Result of study indicates that at normal temperature,the lower the initial concentration of sulfides in sulfurous wastewater,the faster the reaction rate of MgO and desulfurization agent with sulfides,and their reaction can be completed within 3 minutes.The novel agent proves to be a high-efficiency flue gas desulfurization reagent.