| Authors | ملیحه محلوجی فر,محمد رضا منصور نیا |
|---|
| Journal | Materials Research Express |
|---|
| Page number | 25040 |
|---|
| Volume number | 6 |
|---|
| IF | 1.449 |
|---|
| Paper Type | Full Paper |
|---|
| Published At | 2018-11-23 |
|---|
| Journal Grade | Scientific - research |
|---|
| Journal Type | Electronic |
|---|
| Journal Country | Iran, Islamic Republic Of |
|---|
| Journal Index | SCOPUS ,JCR |
|---|
Abstract
Abstract: In this study, we report the thermal decomposition, phase transformation, and
morphological change of two-component kaolinite-K2CO3 (KK) and three-component kaolinite-
K2CO3-Na2CO3 (KKN) solid mixtures calcined at different temperatures. First, the conversion of
kaolinite to the hexagonal and orthorhombic phases of KAlSiO4 via heat treating in solid alkali
media of K2CO3 is investigated. Then, the phase transformations and morphological changes for
MAlSiO4 as the product (M = K, K0.75Na0.25, K0.5Na0.5, K0.25Na0.75, Na), from KAlSiO4 to
NaAlSiO4, are completely examined at 800 °C and 1100 °C. The as-made phases were
characterized utilizing XRD, FT-IR, EDX and FE-SEM techniques. The results demonstrated
that the most important factors having remarkable effect on the formation of different phases are
the mole ratio of K/Na in initial applied carbonate media and the calcination temperature. The
study provides the basic data and the methods for efficient and extensive application of natural kaolinite.
