尾矿
矿化(土壤科学)
钴
镍
超镁铁质岩
硫化物
浸出(土壤学)
橄榄石
硫化物矿物
化学
无机化学
地质学
材料科学
冶金
地球化学
矿物学
氮气
有机化学
土壤科学
土壤水分
作者
Fei Wang,David Dreisinger,Glenn Barr
标识
DOI:10.1007/978-3-031-38141-6_6
摘要
The path to carbon neutrality and transition to global clean energy require accelerated CO2 sequestration and enhanced supply of critical metals. Comprehensive utilization of ultramafic tailings is a promising route to achieve these goals since these materials contain abundant suitable minerals for CO2 mineralization and residual critical metals for further recovery. This work presents the accelerated CO2 mineralization and simultaneous critical metal recovery from ultramafic tailings in a single step under elevated temperature and CO2 pressure. Olivine ((Mg, Fe, Ni, Co)2SiO4) is found as the main reactive mineral during the accelerated CO2 mineralization process and as the important source of nickel and cobalt for recovery. Usage of an aqueous solution containing sodium bicarbonate and a suitable ligand (e.g., trisodium nitrilotriacetate (NTA)) can simultaneously achieve CO2 permanent storage and nickel and cobalt extraction from olivine-based mine tailings. The selectively extracted nickel and cobalt in aqueous solution can be recovered through sulfide precipitation as high-value nickel sulfide concentrates. The use of NTA can also significantly accelerate the coupled CO2 mineralization and metal leaching process and minimize the effects of iron content in olivine on the reaction kinetics. The important findings can make important contributions to utilize ultramafic tailings for enhanced CO2 storage and global supply of critical metals toward carbon neutrality and sustainable developments.
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