期刊
MINERALS ENGINEERING
卷 30, 期 -, 页码 75-86出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2011.12.004
关键词
Mineral carbonation; Serpentinite; Magnesium hydroxide; Ammonium sulphate; Magnesium extraction; Precipitation
资金
- Shell Global solutions International B.V, Amsterdam (NL)
- Academy of Finland
- KH Renlund Foundation
Carbonation of abundantly available magnesium silicates such as serpentinites could be an attractive route to capture and store CO2. In this paper we describe a novel route to produce magnesium hydroxide, Mg(OH)(2), from Finnish serpentinite. The resulting Mg(OH)(2) is much more reactive towards CO2 than the parent serpentinite. The process route of producing Mg(OH)(2) as reported here involves a staged process of Mg extraction using a moderately high temperature solid/solid reaction of serpentinite and ammonium sulphate (AS) salt followed by precipitation of Mg(OH)(2) using aqueous ammonia. Tests at 400-550 degrees C showed promising results. An optimum range of reaction conditions for the extraction stage (Mg extraction) and precipitation stages (production of valuable products) of the process was also identified. The valuable solid products refer to Fe-containing compound (dark brown solid, exhibiting the properties of FeOOH) and Mg(OH)(2) (white precipitate), both precipitated in an aqueous solution with 25% (v/v) ammonia at pH 8-9 and 11-12, respectively. in some cases all Mg extracted from serpentinite was converted to magnesium Mg(OH)(2) with very small volumes of ammonia solution added. Apart from the relatively cheap AS salt reagent, the prospect of recovery and use of by-products of the process: ammonia gas, FeOOH, and AS salt presents significant benefits. (c) 2011 Elsevier Ltd. All rights reserved.
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