TY - JOUR
T1 - Production of magnesium hydroxide from magnesium silicate for the purpose of CO 2 mineralisation - Part 1
T2 - Application to Finnish serpentinite
AU - Nduagu, Experience
AU - Björklöf, Thomas
AU - Fagerlund, Johan
AU - Wärn, Johan
AU - Geerlings, Hans
AU - Zevenhoven, Ron
N1 - Funding Information:
Shell Global solutions International B.V, Amsterdam (NL) is acknowledged for funding and support, mentioning specifically Dr Marcel Verduyn. We want to acknowledge also the Academy of Finland Sustainable Energy “SusEn” Programme (2008–2011) and KH Renlund Foundation (2007–2009) for additional support. Paul Ek and Sten Lindholm from the Laboratory of Analytical Chemistry at ÅAU deserve some appreciation for the ICP-OES analysis, as Dr. Kaj Fröberg, Berndt Södergård and Jaana Paananen from the Laboratory of Inorganic Chemistry ÅAU for support with XRD analysis. Many thanks to Lauri Järvinen, currently with the Laboratory of Geology and Mineralogy at ÅAU for processing of Finnish serpentinite rock to required particle size. The mineral used here was provided by Mr. Olli-Pekka Isomäki from Finn Nickel Oy at Hitura, Finland.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/4
Y1 - 2012/4
N2 - Carbonation of abundantly available magnesium silicates such as serpentinites could be an attractive route to capture and store CO 2. 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 CO 2 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°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.
AB - Carbonation of abundantly available magnesium silicates such as serpentinites could be an attractive route to capture and store CO 2. 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 CO 2 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°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.
KW - Ammonium sulphate
KW - Magnesium extraction
KW - Magnesium hydroxide
KW - Mineral carbonation
KW - Precipitation
KW - Serpentinite
UR - http://www.scopus.com/inward/record.url?scp=84859421272&partnerID=8YFLogxK
U2 - 10.1016/j.mineng.2011.12.004
DO - 10.1016/j.mineng.2011.12.004
M3 - Article
AN - SCOPUS:84859421272
SN - 0892-6875
VL - 30
SP - 75
EP - 86
JO - Minerals Engineering
JF - Minerals Engineering
ER -