Department of Chemistry, National Institute of Technology, Rourkela 769008, Orissa, India.
J Hazard Mater. 2010 Jul 15;179(1-3):28-34. doi: 10.1016/j.jhazmat.2010.02.052. Epub 2010 Feb 24.
A laboratory study was conducted to investigate the ability of neutralization of red mud (RM) using carbon dioxide gas sequestration cycle at ambient conditions. The neutralized red mud (NRM) was characterized by XRD, SEM, EDX, FT-IR and auto titration method. X-ray diffraction pattern of NRM was revealed that the intensity of gibbsite was increased prominently and formed ilmenite due to dissolution of minerals. EDX analysis was showed that the %(w/w) of Na, C, O, Si were higher in the carbonated filtrate as compared to the RM and NRM. The permanently sequestered CO(2)%(w/w) per 10 g of red mud were approximately 26.33, approximately 58.01, approximately 55.37, and approximately 54.42 in NRM and first, second, third cycles of carbonated filtrate, respectively. The pH of red mud was decreased from approximately 11.8 to approximately 8.45 and alkalinity was decreased from approximately 10,789 to approximately 178 mg/L. The acid neutralizing capacity of NRM was approximately 0.23 mol H(+)/kg of red mud. The specific advantages of these cyclic processes are that, large amount of CO(2) can be captured as compared to single step.
进行了一项实验室研究，以调查在环境条件下使用二氧化碳气体固碳循环中和赤泥（RM）的能力。通过 XRD、SEM、EDX、FT-IR 和自动滴定法对中和赤泥（NRM）进行了表征。NRM 的 X 射线衍射图谱表明，水铝石的强度明显增加，并由于矿物的溶解而形成钛铁矿。EDX 分析表明，与 RM 和 NRM 相比，碳酸化滤液中 Na、C、O、Si 的%（w/w）更高。每 10 g 赤泥永久封存的 CO2%（w/w）分别约为 26.33、约 58.01、约 55.37 和约 54.42，在 NRM 和碳酸化滤液的第一、第二和第三循环中。赤泥的 pH 值从约 11.8 降低至约 8.45，碱度从约 10789 降低至约 178 mg/L。NRM 的酸中和能力约为 0.23 mol H+ / kg 赤泥。这些循环过程的特定优势在于，可以比单步过程捕获大量的 CO2。
