Physico-chemical characteristics of some Lesotho’s clays and their assessment for suitability in ceramics production
| Autor: | Mukuna Patrick Mubiayi, Monaheng L. Masheane, Thimothy Thamae, Sabelo D. Mhlanga, Lebea N. Nthunya |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
General Chemical Engineering Mineralogy 020101 civil engineering 02 engineering and technology Raw material Silt 021001 nanoscience & nanotechnology 0201 civil engineering Flexural strength Environmental chemistry Particle-size distribution Mica Particle size 0210 nano-technology Water content Shrinkage |
| Zdroj: | Particulate Science and Technology. 36:117-122 |
| ISSN: | 1548-0046 0272-6351 |
| Popis: | The physico-chemical properties of three clays (reddish, yellow and gray) collected at Ha Motloheloa quarry in Lesotho were determined. The main components in all the clays were SiO2, Al2O3, Fe2O3 and K2O in the form of mica, CaO, MgO, Na2O, TiO2 and P2O5 with less than 6% loss of ignition (LOI). The clays showed a wide variation in particle sizes with clay fractions from 15.81% to 27.38%, silt fractions from 41.95% to 52.32% and sand fractions from 30.6% to 31.9%. The surface area of the clays increased with a decrease in particle size. All the clays showed water content below 9% and shrinkage value below 6%. The clays had moderate plasticity indexes between 20 and 25 and less than 9% water content with 17.32%–20.72% water required to produce sufficient workability. Their densities were less than 3 g/cm−3 and had low green to dry shrinkage (4.19%–5.35%). For all firing temperatures used (950°C–1100°C), the flexural strength varied from 2.3 to 17.6 MPa, while the water content varied from 6.1% to ... |
| Databáze: | OpenAIRE |
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