Han Zike, Gao Jianqiu, Yuan Xizhi, Zhong Yanjun, Ma Xiaodong, Chen Zhiyuan, Luo Dongmei, Wang Ye
School of Chemical Engineering, Sichuan University No. 24 South Section 1, Yihuan Road Chengdu 610065 P. R. China
School of Chemical Engineering, University of Queensland Brisbane Australia.
RSC Adv. 2020 May 7;10(30):17836-17844. doi: 10.1039/d0ra02846k. eCollection 2020 May 5.
For both the waste treatment of large quantities of blast furnace (BF) slag and carbon dioxide (CO) that are discharged in ironworks, mineral carbonation by BF slag was proposed in this decade. However, it has not been widely used due to its high energy consumption and low production efficiency. In this study, a microwave roasting method was employed to mineralize CO with BF slag, and the process parameters for the sulfation and energy consumption were investigated. A mixture of BF slag and recyclable ammonium sulfate [(NH)SO] (mass ratio, 1 : 2) was roasted in a microwave tube furnace, and then leached with distilled water at a solid : liquid ratio of 1 : 3 (g mL). Under the optimized experiment conditions ( = 340 °C, holding time = 2 min), the best sulfation ratios of calcium (Ca), magnesium (Mg), aluminum (Al), and titanium (Ti) were 93.3%, 98.3%, 97.5%, and 80.4%, respectively. Compared with traditional roasting, the production efficiency of this process was more than 10 times higher, and the energy consumption for mineralizing 1 kg of CO could be reduced by 40.2% after simulation with Aspen Plus v8.8. Moreover, 236.1 kg of CO could be mineralized by one ton of BF slag, and a series of by-products with economic value could also be obtained. The proposed process offers an energy-efficient method with high productivity and good economy for industrial waste treatment and CO storage.
针对钢铁厂排放的大量高炉（BF）矿渣和二氧化碳（CO）的废弃物处理问题，本十年提出了利用高炉矿渣进行矿物碳酸化的方法。然而，由于其高能耗和低生产效率，该方法尚未得到广泛应用。在本研究中，采用微波焙烧法使高炉矿渣与CO发生矿化反应，并研究了硫酸化过程参数和能耗。将高炉矿渣与可回收的硫酸铵[(NH)SO]（质量比为1∶2）的混合物在微波管式炉中焙烧，然后以1∶3（g/mL）的固液比用蒸馏水浸出。在优化的实验条件下（温度=340℃，保温时间=2分钟），钙（Ca）、镁（Mg）、铝（Al）和钛（Ti）的最佳硫酸化率分别为93.3%、98.3%、97.5%和80.4%。与传统焙烧相比，该工艺的生产效率提高了10倍以上，使用Aspen Plus v8.8模拟后，将1 kg CO矿化的能耗可降低40.2%。此外，1吨高炉矿渣可使236.1 kg CO矿化，还可获得一系列具有经济价值的副产品。所提出的工艺为工业废弃物处理和CO封存提供了一种高能效、高生产率且经济良好的方法。
