Value added utilization of ferronickel slags as raw materials of 4A zeolite for CO 2 reduction
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Value added utilization of ferronickel slags as raw materials of 4A zeolite for CO2 reduction Shuwen Cheng1 · Tao Du1 · Yuan Long1 · Liying Liu1 · Gang Li1,2 Received: 30 August 2019 / Revised: 31 May 2020 / Accepted: 23 June 2020 / Published online: 29 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The scale of smelting ferronickel by RKEF (Rotary kiln—electric furnace) process is increasing these years, these untreated ferronickel slags will occupy a large area as accumulation and cause ecological damage. On the other hand, the C O2 emission and global warming are urgent problems to be solved as they have resulted in severe climate change. Carbon Capture and Storage (CCS) technology is considered as a feasible solution to the problem of excessive C O2 emissions, and the key of the CCS is the exploration for adsorbents which are low-cost, efficient and energy saving. We found that it is viable to use ferronickel slag as raw material to synthesize 4A zeolite. Further improvement for the purities of 4A zeolite was also accomplished by optimizing the synthesis conditions via single factor experiments. The as-synthesized sample was characterized in terms of structural morphology, chemical composition and surface properties. The adsorption and adsorption kinetics properties were investigated by thermal gravimetric analyzer and four models, respectively. The results indicated that 4A zeolite has a great performance in the adsorption and separation of C O2/N2 with the high value-added utilization of ferronickel slags which conducts. Keywords Ferronickel slags · CO2/N2 adsorption and separation · CO2 emission · 4A zeolite
1 Introduction The ferronickel slag (FNS) is a by-product formed in the process from molten nickel slag to granulated slag by water quenching in the nickel–iron industry which occupied a large proportion of industrial waste (Chen et al. 2020). Approximately 14 tons of FNS can be produced by 1 ton of ferronickel production and millions of tons of FNS are generated in China yearly (Saha and Sarker 2016). Meanwhile, the climate change related to excessive C O2 emission is a tricky problem we faced these years. Plenty of CO2 captured technologies has been formed to reduce the C O2 emission from the industry exhaust including pre-combustion, * Tao Du [email protected] Shuwen Cheng [email protected] 1
SEP Key Laboratory of Eco‑Industry, Northeastern University, Shenyang, Liaoning 110819, People’s Republic of China
Department of Chemical Engineering, The University of Melbourne, Melbourne, VIC 3010, Australia
2
post-combustion and oxygen-enriched burning technology (The post-combustion contains absorption methods and membrane separation adsorption method) (Anthony and Clough 2019). Carbon Capture and Storage (CCS) is a feasible technological measurement for mitigating global warming, whose critical point is the selection of absorbents. High selectivity for CO2 over N2 is essential when evaluating an adsorbent for CO2 capture, thus it has rece
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