Surface modification of wollastonite by the mechano-activated method and its properties

Abstract

Surface modification of wollastonite particles using titanate as a modification agent incorporated by simultaneous wet ultra-fine grinding in a laboratory stirred mill was investigated. The physical, physic-chemical and application properties of the modified wollastonite were measured and evaluated. The results showed that grinding intensity markedly influences the modification effect because of the mechano chemical effect. The hydrophilic surface of wollastonite was turned into a hydrophobic one after modification. The interaction between titanate and wollastonite under wet grinding circumstances was studied. It was suggested that physical adsorption and chemical adsorption of titanate coexisted on the wollastonite surface. The mechanical properties of polyethylene (PE) filled with the modified wollastonite powder were markedly improved.

Keywords

silicate minerals / modification / surface properties / ball milling / fillers

References

[1] Zheng S.L. Powder Surface Modification, 2003 Beijing, China Building Materials Industry Press, 45.

[2] Ding H., Lu S.C. The theory and practice of the research on mechano-activated surface modification of minerals powder. Met. Ore Dressing Abroad, 1996, 33(9): 14.

[3] Wu W., Lu S.C. Mechano-chemical surface modification of calcium carbonate particles by polymer grafting. Powder Technol., 2003, 137, 41.

[4] Frank S., Stefan M., Jorg S., Wolfgang P. The influence of suspension properties on the grinding behavior of aluminum particles in the submicron site in stirred media mills. Powder Technol., 2005, 156, 103.

[5] Al-Wakeel M.I. Effect of mechanical treatment on the mineralogical constituents of Abu-Tartour phosphate ore, Egypt. Int. J. Miner. Process., 2005, 75, 1015.

[6] Makó Senkár Z., Kristóf J., et al. Surface modification of mechanochemically activated kaolinites by selective leaching. J. Colloid Interface Sci., 2006, 294(2): 362.

[7] Kristof E., Juhaza Z. The effect of intensive grinding on the crystal structure of dolomite. Powder Technol., 1993, 75, 175.

[8] Pourghahramani P., Forssberg E. Microstructure characterization of mechanically activated hematite using XRD line broadening. Int. J. Miner. Process., 2006, 79, 106.

[9] Hiroshi U. The surface-treatment of ceramic powders through pulverization in a reactive atmosphere with a ball mill (1)—The surface treatment of quartz powder. J. Soc. Powder Technol. Jpn., 1989, 26(9): 646.

[10] Hiroshi U. The surface-treatment of ceramic powders through pulverization in a reactive atmosphere by means of ball mill (2)—Pulverization of Al₂O₃ in a reactive atmosphere by means of ball mill. J. Soc. Powder Technol. Jpn., 1990, 27(10): 664.

[11] Suzuki N. The surface-treatment of ceramic powders through pulverization in a reactive atmosphere by means of ball mill (IV)—Surface treatment of silicon carbide. J. Soc. Powder Technol. Jpn., 1991, 28(11): 670.

[12] Ding H., Lu S.C., Deng Y.X., Du G.X. Mechano-activated surface modification of calcium carbonate in wet stirred mill and its properties. Trans. Nonferrous Met. Soc. China, 2007, 17(5): 1100.

[13] Ding H., Liu Y.G., Deng Y.X., Du Y.L. The action mechanism of preparation of calcium carbonate/titanate composite material by mechano-activated method. Key Eng. Mater., 2007, 353–358, 1354.

[14] Du Y.L., Ding H., Liu Y.G., Deng Y.X. Preparation of characterization of calcium carbonate/titanate composite material by mechano-activated method. Key Eng. Mater., 2007, 353–358, 1358.

[15] Ding H., Lu S.C. Research on surface modification of finely ground calcium carbonate with aluminate accompanied by simultaneous wet ultrafine grinding in stirred mill. China Min. Mag., 1999, 8(2): 67.

[16] Ding H., Xu X., Du G.X., Zhu X.Y. The action mechanism of modifying calcium carbonate using alkylamine dimethyl phosphonic acid. J. Chin. Ceram. Soc., 2008, 36(12): 1785.

[17] Y.L. Du and H. Ding, Study on mechano-activated surface modification of tourmaline powder, China Non Met. Min. Ind. Herald, 2006, No.5, p.33.

[18] Wen L., Liang W.X., Zhang Z.G., Huang J.C. Infrared Spectra of Mineral, 1988 Chongqing, Chongqing University Press, 78.

[19] Wang Z.M., He X.X., Sun D.H. Practical Infrared Spectroscopy, 1982 Beijing, Petroleum Industry Press, 138.

[20] Zheng S.L., Yuan J.Z. Handbook for Processing Technology and Application of Non-Metal Minerals, 2005 Beijing, Metallurgical Industry Press, 489.