Dissolution Test on CO2 Mineralization by Fly Ash

doi:10.3969/j.issn.1000-7229.2014.07.010

Abstract

Abstract:

CO2 mineralization and sequestration provides an effective way to reduce greenhouse gas emissions, which is suitable for the lack of geological conditions of reservoir area. According to the problems of traditional mineralization technology, such as complicated processes, extreme reaction conditions and the raw materials with high prices in China, this paper proposed the CO2 mineralization and sequestration technology, which used cheap fly ash as raw materials and recyclable ammonium salts NH4HSO4 as dissolution agent. This technology can greatly reduce the reaction temperature of mineralization dissolution, and can not only effective dissolve metallic elements such as Ca, Mg for CO2 mineralization and sequestration, but also produce high value-added products containing Al, Fe elements. This paper also studied the influence of the composition of fly ash, solvent concentration, solid-liquid ratio and other conditions on metal dissolution rate, and obtained the dissolution laws of metallic elements from fly ash in mild condition. The results show that 37% of Ca and 72% of Mg can be extracted from fly ash in 2 h with 3.5 mol/L NH4HSO4 and 25 g/L solid-liquid ratio, respectively. The fly ash of Wuhai Thermal Power Plant is more suitable for CO2 mineralization than the others, because of the highest calcium content.

Key words: CO2 mineralization, fly ash, dissolution, mild condition

WANG Xiaolong, WAN Chaoran, GAO Shiwang, XIE Qiang. Dissolution Test on CO2 Mineralization by Fly Ash[J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(7): 58-62.

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