Effect of the plant waste onto the properties of use and the microstructure of phyllosilicates based ceramics

摘要

The present study aimed at using plant waste (Musa Paradisiaca) for manufacturing clay-based ceramics in order to promote lower sintering temperature while preserving the properties of use. Two kaolinic-illitic clays (NZ1 and KO) from Central African Republic were used mixed with 1 to 10 mass of the plant waste (MP). The clays and the waste exhibited accessory phases: quartz and iron oxides, and K2O respectively. MP was collected, dried and sieved (<100 mu m) previously to its mixture with clays. According to the sintering behavior of KO and NZ1 derived from thermodilatometry, the densification was obtained after firing at 1200 degrees C. Results showed that open porosity decreased from 35 to 17 with increasing temperature in the range 900 to 1200 degrees C for KO and NZ1. This porosity remained in the range 30-40 while increasing the MP content (firing at 1000 degrees C for 1h.). The optimized MP content was 3 and 5 mass for KO and NZ1 clay materials respectively. The compressive strength and thermal conductivities were improved compared to clay samples without MP fired at 1200 degrees C. Moreover a significant decrease in the sintering temperature was achieved, leading to energy saving in line with sustainability issues.