Development of imitation black spinel from pineapple leaves

Abstract

The aims of this research, study the effect of using ashes from pineapple leaves to develop of imitation black spinel. From the analysis of main components of pineapple leaves, both before and after burning. It was found that before burning, pineapple leaves have main element is K2O SiO2 and CaO. In proportion equal to 41. 333, 31. 202 and 23. 067 ( Wt%) and also found that the elements of the additives that affect the color Including MnO, Fe2O3, NiO and CuO. After sintering at a temperature of 500 °C. Found that quantity K2O and CaO has increased proportion. On the other hand, SiO2 has decrease proportion. Then Use the ashes from the burnt pineapple leaves as a chemical replace SiO2 in glass formula (45-x) B2O3: 20SiO2: 15Bi2O3: 20Na2O: xCoO (where x was 8, 10, 12, 14 and 16 mol%). Found that the glass is opaque. The density of the glass was between 3.9704 􀁲 0.0217 to 4.2015 􀁲 0.0066 g/cm3, which is greater than the density of black spinel. Glass had a hardness value of 6.5 Mohs scale compared to sapphire at 7.5 Mohs scale.