精炼渣钙组分乙酸浸出制备钙基CO2吸附材料

关键词： CO2； 高炉煤气； 乙酸浸出； 钙基吸附剂； 精炼渣

LI Ling-ling,CHEN Ren,ZHANG Zuo-liang,MENG Xiang-ran,LIN Jun,ZOU Zong-shu

Based on the requirements for developing circular economy and enhancing environmental protection in the metallurgical industry, calcium based material was prepared with refining slag as the raw material, which is convenient for comprehensive utilization of refining slag and industrial flue gas. The adsorption of pure CO2 gas and CO2 in blast furnace gas by calcium based material was further comparatively studied. Through the route of “crushing ultrasonic pretreatment acetic acid leaching precipitation calcination”, the calcium components in refining slag were extracted and recovered. The results show that when the acetic acid concentration is 1mol/L, the solid liquid ratio is 1∶10, the leaching time is 1h, and the leaching temperature is 40℃, the recovery rate of calcium in refining slag can reach 32.7%, and the mass fraction of CaO in the prepared calcium based material is 94.1%. At 400℃, the adsorption capacity of calcium based material to pure CO2 gas and CO2 in blast furnace gas is 30.8 and 19.1mg/g, respectively. The adsorption capacity of the calcium based material to CO2 in blast furnace gas is 62% of that to pure CO2 gas, which shows a good performance of the material for CO2 adsorption from blast furnace gas.