Facile purification of locally mined gypsum and its use for preparing nano-hemihydrates
Keywords:Gypsum, Hemihydrate, Retrograde solubility, Microwave energy, Purification
Gypsum has a wide range of applications, in interior decorations, building construction, supplements or implants in orthopaedics to mention a few. However, in many developing countries including Nigeria, there is still a large-scale importation despite huge available natural deposits. In this study, a facile method to purify locally-mined gypsum has been explored based on the mineral retrograde solubility in water. The purified gypsum was investigated for its elemental composition in comparison to the crude sample and a commercially obtained medical-grade gypsum using X-ray fluorescence (XRF). The results showed that the purified gypsum contained 94.05% CaSO4 compared with the crude which had a CaSO4 content of 58.10%. Hemihydrates obtained by the treatments of the purified gypsum in an oven, autoclave and microwave gave different morphologies when observed under a scanning electron microscope (SEM). Transmission electron microscopy (TEM) showed that particle sizes of all the hemihydrates were within the range 9 nm to 32 nm, but the microwave-derived sample exhibited the most desirable morphological characteristics which could impart high mechanical performance. We have reported here a new facile method for purifying gypsum ore that can have huge commercial benefits.
K. Asante – Kyei, “Manufacturing of local plaster of Paris (P.O.P) from salt residue mined in Sege in the Dangme East District of the Greater Accra Region of Ghana,” Research Journal of Environmental and Earth Sciences, vol. 4(4), pp. 953-958, 2012.
P. Coquard, R. Boistelle, L. Amathieu, and P. Barriac, “Hardness, elasticity modulus and flexion strength of dry set plaster,” Journal of Materials Science, vol. 29(17), pp. 4611-4617, 1994. DOI: https://doi.org/10.1007/BF00376285
J. Karni, and E. Karni, “Gypsum in construction: origin and properties,” Materials Structures, vol. 28(2), pp. 92-100, 1995. DOI: https://doi.org/10.1007/BF02473176
M. Arikan, and K. Sobolev, “The optimization of gypsum-based composite material,” Cement and Concrete Research, vol. 32(11), pp. 1725-1728, 2002. DOI: https://doi.org/10.1016/S0008-8846(02)00858-X
P.E. Harris, S. Hoyer, T.J. Lindquist, and C.M. Stanford, “Alterations of surface hardness with gypsum die hardeners,” Journal Prosthetic Dentistry, vol. 92(1), pp. 35-38, 2004. DOI: https://doi.org/10.1016/j.prosdent.2004.04.002
L.G.N. Melo, M.J.H. Nagata, A.F. Bosco, L.L.G Ribeiro, and C.M. Leite, “Bone healing in surgically created defects treated with either bioactive Glass particles, a calcium sulfate barrier, or a combination of both materials,” Clinical Oral Implants Research, vol. 16(6), pp. 683-691, 2005. DOI: https://doi.org/10.1111/j.1600-0501.2005.01090.x
A. Papageorgiou, G. Tzouvalas, and S. Tsimas, ‘Use of inorganic setting retarders in cement industry,” Cement and Concrete Research, vol. 27(2), pp 183-189, 2005. DOI: https://doi.org/10.1016/j.cemconcomp.2004.02.005
C.P. Peters, J.L. Hines, K.N. Bachus, M.A. Craig, and R.D. Bloebaum, “Biological effects of calcium sulfate as bone graft substitute in ovine metaphyseal defects,” Journal of Biomedical Materials Research A, vol. 76(3), pp. 456-462, 2005. DOI: https://doi.org/10.1002/jbm.a.30569
T. Sievert, W. Wolter, and N.B. Singh, “Hydration of anhydrite of gypsum (CaSO4.II) in a ball mill,” Cement and Concrete Research, vol. 35(4), pp. 623-630, 2005. DOI: https://doi.org/10.1016/j.cemconres.2004.02.010
M.D. Dogara, and J.O. Aloa, “Preliminary estimate of gypsum deposit based on Wenner and Schlumberger electrical resistivity methods at Ikpeshi, Edo State, Nigeria,” Scientific World Journal, vol. 12(2), pp. 19-23, 2017.
Trendeconomy. (2021). Annual International Trade Statistics by country (HS02), Reporting period: 2002-2020. Available: https://trendeconomy.com/data/h2/Nigeria/2520.
U. Lar, Local sourcing of gypsum for industrial utilization in Nigeria, Nigerian Society of Chemical Engineers Conference, Abuja, Nigeria, 2016.
J. Moisset, and A. Petit, Process for Preparation of Purified Calcium Sulfate in an Aqueous Medium, US Patent, Application 5,173,284 A, 1992.
E.M. van der Merwe, and C.A. Strydom, “Purification of South African phosphogypsum for use as Portland cement retarder by a combined thermal and sulphuric acid treatment method,” South African Journal of Science, vol. 100(9), pp. 411-414, 2004.
H. Ölmez, and E. Erdem, “The effects of phosphogypsum on the setting and mechanical properties of Portland cement and Trass cement,” Cement and Concrete Research, vol. 19(3), pp. 377-384, 1989. DOI: https://doi.org/10.1016/0008-8846(89)90027-6
Y. Erdogan, A. Demirbas, and H. Genc, “Partly refined chemical by-product gypsums as cement additives,” Cement and Concrete Research, vol. 24(4), pp..601-604), 1994. DOI: https://doi.org/10.1016/0008-8846(94)90183-X
M. Singh, M. Garg, C.L. Verma, S.K. Handa, and R. Kumar, “An improved process for the purification of phosphogypsum,” Construction and Building Materials, vol. 10(8), pp. 597-600, 1996. DOI: https://doi.org/10.1016/S0950-0618(96)00019-0
S. Al-Jabbari, F. Faisal, F. Ali, and S. Nasir, “Scientific Research Council,” Baghdad, Building Research, (Baghdad), vol. 7, pp. 49-69, 1988.
A. Jarosinski, “Properties of anhydrite cement obtained from apatiapatite phosphogypsum. properties of anhydrite cement obtained from apatite phosphogypsum,” Cement and Concrete Research, vol. 24, pp. 99-108, 1994. DOI: https://doi.org/10.1016/0008-8846(94)90090-6
I. Hammas-Nasri, K. Horchani-Naifer, and M. Férid, “Rare earths concentration from phosphogypsum waste by two-step leaching method,” International Journal of Minerals Processing, vol. 149, pp. 78-83, 2016. DOI: https://doi.org/10.1016/j.minpro.2016.02.011
R. Moalla, M. Gargouri, F. Khmiri, L. Kamoun, and M. Zairi, “Phosphogypsum purification for plaster production: a process optimization using full factorial design,” Environmental Engineering Research, vol. 23(1), pp. 36-45, 2018. DOI: https://doi.org/10.4491/eer.2017.055
J. Kaszuba, B. Yardley, and M. Andreani, “Experimental perspectives of mineral dissolution and precipitation due to carbon dioxide-water-rock interactions,” Reviews in Mineralogy and Geochemistry, vol. 77(1), pp. 153-188, 2013. DOI: https://doi.org/10.2138/rmg.2013.77.5
A. Klimchouk, “The Dissolution and conversion of gypsum and anhydrite,” International Journal of Speleology, vol. 25(3-4), pp. 21-36, 1996. DOI: https://doi.org/10.5038/1827-806X.25.3.2
N.B. Singh, and B. Middendorf, “Calcium sulphate hemihydrate hydration leading to gypsum crystallization,” Progress in Crystal Growth and Characterization of Materials, vol. 53(1), pp. 57-77, 2007. DOI: https://doi.org/10.1016/j.pcrysgrow.2007.01.002
Q.L. Yu, and H.J.H. Brouwers, “Thermal properties and micro-structure of gypsum board and its dehydration products: a theoretical and experimental investigation,” Fire Materials, vol. 36(7), pp. 575-589, 2011. DOI: https://doi.org/10.1002/fam.1117
Y. Li, Q. Li, and H. Ma, “The voids formation mechanisms and their effects on the mechanical properties of flax fiber reinforced epoxy composites,” Composites Part A: Applied Science and Manufacturing, vol. 72, pp. 40-48, 2015. DOI: https://doi.org/10.1016/j.compositesa.2015.01.029
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