Pedosphere 8(1): 79--84, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Changes of clay mineral association after high-gradient magnetic separation |
| LIU Fan1, TAN Wen-Feng1, HE Ji-Zheng1, LI Xue-Yuan1 and A. VIOLANTE2 |
1 Huazhong Agricultural University, Wuhan 430070 (China)
2 Universitã di Napoli "federico Ⅱ", Napoli 880055 (Italy) |
| ABSTRACT |
| The changes of clay mineral association after high-gradient magnetic separation (HGMS) treatment, and the effects of chemical and physical technologies on concentrating Fe oxides for main soils in central and southern China were investigated by means of X-ray diffraction (XRD) and chemical analysis methods. Results indicated that the concentrating times of Fe oxides by HGMS treatment were the largest for 0.2~2 μm size fractions in the examined soils. For the soils in which 2:1 phyllosilicates were dominant, concentrating times of iron oxides by HGMS treatment were larger than by 5 mol L-1 NaOH treatment. Phyllosilicates were decreased after HGMS treatment; however, the decrease was less than that of kaolinite. The goethite/(goethite+hematite) values in Fe oxides of the soils kept virtually constant after HGMS treatment. |
| Key Words: clay mineral, Fe oxides, magnetic separation, soil |
| Citation: Liu, F., Tan, W. F., He, J. Z., Li, X. Y. and Violante, A. 1998. Changes of clay mineral association after high-gradient magnetic separation. Pedosphere. 8(1): 79-84. |
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