Energy-efficient mineral carbonation of blast furnace slag with high value-added products
作者： Qiang Liu , Weizao Liu , Jinpeng Hu , Lin Wang , Jianqiu Gao
DOI: 10.1016/J.JCLEPRO.2018.06.150
关键词:
摘要: Abstract Large quantities of CO2 and blast furnace (BF) slag are discharged in the iron steel industry. Mineral carbonation can offer substantial emission reduction comprehensive utilization solid waste. An energy- cost-efficient mineral technology combined with NH3 capturing simultaneous power generation is presented this article. In process, was leached recyclable ammonium bisulphate (ABS) to extract Ca, Mg Al. Gaseous ammonia, which produced during sulphate (AS) roasting for ABS regeneration, used capture flue gases using a mineralization cell (CMC) simultaneously generate NH4HCO3 electricity. The extracted CaSO4 MgSO4 reacted an NH4HCO3/NH3 solution realize stable sequestration while Al recovered form aluminium sulphate, high value-added product. process parameters efficiency leaching, recovery were investigated detail present study. results showed that approximately 91% 97% Ca BF converted into corresponding carbonates 76% NH4Al(SO4)212H2O purity 99.6 wt.%. 3802 kg required 1000 kg CO2. A preliminary energy analysis indicated although somewhat intensive without net emission, improved generating electrical mixed (AS)+ instead separated aqueous leaching slag, energy-efficient 567 kg economic demonstrated sales revenue primary products after deducting cost raw materials reached up $427
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