Silicate rocks (mica, feldspar, glauconite, and sericite) having potash values of 7–11% are evaluated as an alternative potash source. Direct leaching of the feed sample in different lixiviants yielded very less potash extraction (1–5%). Heat treatment with suitable flux such as calcium chloride resulted in 100% potash recovery from mica and glauconite, whereas it was limited to 71% and 65% for feldspar and sericite. The activation energy for CaCl2 reaction with mica, feldspar, glauconite, and sericite is 64.35, 70.14, 69.17 and 86.63 kJ/mol. K – extraction is a function of silica-alumina ratio and association of K – bearing phase.
AittaE, LeskelaM, LajunenLHJ, JyrkasK, SeppalaE.1986. Thermal treatment of phlogopite and muscovite with calcium and magnesium compounds. J Chem Technol Biotechnol. 36:169–177. doi: 10.1002/jctb.280360404
2.
AntonyMP, JhaA, TathavadkarV.2006. Alkali roasting of Indian chromite ores: thermodynamic and kinetic considerations. Miner Process Extr Metall. 115(2):71–79. doi: 10.1179/174328506X109086
3.
Better Crops. 1998. Production and use of potassium. 82(3):6–8.
4.
CiceriD, de OliveiraM, StokesRM, SkorinaT, AllanoreA.2017. Characterization of potassium agrominerals: correlations between petrographic features, comminution, and leaching of ultrapotassic syenites. Miner Eng. 102:42–57. doi: 10.1016/j.mineng.2016.11.016
5.
CrundwellF.2015. The mechanism of dissolution of the feldspars: part I. Dissolution at conditions far from equilibrium. Hydrometallurgy. 151:151–162. doi: 10.1016/j.hydromet.2014.10.006
6.
DarkenLS, GurryRW.1987. Physical chemistry of metals. Delhi: CBS Publishers and distributors. (Indian Edition) 368–369.
7.
EberlDD, SrodonJ, LeeM, NadeauPH, NorthropHR.1987. Sericite from Silverton caldera, Colorado: correlation among structure, composition, origin, and particle thickness. Am Mineral. 72:914–934.
8.
FooteHW, ScholesSR.1912. The extraction of potash and alumina from feldspar. Ind Eng Chem Res. 4(5):377.
9.
HansmaHG.2010. Possible origin of life between mica sheets. J Theor Biol. 266:175–188. doi: 10.1016/j.jtbi.2010.06.016
10.
[IBM] Indian Bureau of Mines. 2018. Indian minerals yearbook 2017, 56th edition: Potash. Vol. III, 1–6.
11.
JenaSK, DhawanN, RaoDS, MisraPK, DasB.2016. Extraction of potash values from pyrophyllite mine waste. Sep Sci Technol. 51(2):269–277. doi: 10.1080/01496395.2015.1086376
12.
JenaSK, DhawanN, RaoDS, MisraPK, MishraBK, DasB.2014. Studies on extraction of potassium values from nepheline syenite. Int J Miner Process. 133:13–22. doi: 10.1016/j.minpro.2014.09.006
13.
KleivRA, ThornhillM.2007. Production of mechanically activated rock flour fertilizer by high intensive ultrafine grinding. Miner Eng. 20(4):334–341. doi: 10.1016/j.mineng.2006.08.017
14.
LiD, JiangK, JiangX, WangS, FanY, LiuW.2018. The recovery of potassium oxide and alumina from alunite concentrate. Hydrometallurgy. 176:1–8. doi: 10.1016/j.hydromet.2017.12.018
15.
LuoZ, YangJ, MaH, LiuM, MaX.2015. Recovery of magnesium and potassium from biotite by sulfuric acid leaching and alkali precipitation with ammonia. Hydrometallurgy. 157:188–193. doi: 10.1016/j.hydromet.2015.08.018
16.
MadorskySL.1932. Volatilization of potash from potassium aluminum silicates. Ind Eng Chem Res. 24(2):233–237. doi: 10.1021/ie50266a027
17.
ManningDAC.2010. Mineral sources of potassium for plant nutrition. A review. Agron Sustainable Dev. 30:281–294. doi: 10.1051/agro/2009023
18.
ManningDAC.2018. Innovation in resourcing geological materials as crop nutrients. Nat Resour Res. 27:217–227. doi: 10.1007/s11053-017-9347-2
19.
MazumderAK, SharmaT, RaoTC.1993. Extraction of potassium from glauconitic sandstone by the roast-leach method. Int J Miner Process. 38:111–123. doi: 10.1016/0301-7516(93)90068-L
20.
RossWH.1917. The extraction of potash from silicate rocks-II. Ind Eng Chem Res. 9(5):467–472.
21.
SantosWO, MattielloEM, CostaLM, AbrahaoWAP, NovaisRF, CantaruttiRB.2015. Thermal and chemical solubilization of verdete for use as potassium fertilizer. Int J Miner Process. 140:72–78. doi: 10.1016/j.minpro.2015.05.003
22.
ShihYJ, ShenYH.2009. Swelling of sericite by LiNO3-hydrothermal treatment. Appl Clay Sci. 43:282–288. doi: 10.1016/j.clay.2008.09.006
23.
SkorinaT, AllanoreA.2015. Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing. Green Chem. 17:2123–2136. doi: 10.1039/C4GC02084G
24.
SmilV.2000. Enriching the earth. Cambridge, Massachusetts: MIT University Press.
25.
VaradachariC.1997. Potash fertilizer from biotite. Ind Eng Chem Res. 36:4768–4773. doi: 10.1021/ie970220u
26.
WangX, MillerJD, ChengF, ChengHG.2014. Potash flotation practice for carnallite resources in the Qinghai Province, PRC. Miner Eng. 66-68:33–39. doi: 10.1016/j.mineng.2014.04.012
27.
YeL, YueH, WangY, ShengH, YuanB, LvL, LiC, LiangB, ZhuJ, XieH.2014. CO2 Mineralization of activated K-feldspar + CaCl2 slag to fix carbon and produce soluble potash salt. Ind Eng Chem Res. 53(26):10557–10565. doi: 10.1021/ie500992y
28.
ZhongY, GaoJ, ChenP, GuoZ.2017. Recovery of potassium from K-feldspar by thermal decomposition with flue gas desulfurization gypsum and CaCO3: analysis of mechanism and kinetics. Energy Fuels. 31:699–707. doi: 10.1021/acs.energyfuels.6b01915
