Abstract
In this research, soluble sodium silicate was extracted from rice husk ash. Rice husk in its as-received state was initially burnt in an open air to obtain the rice husk ash (RHA), which was later thermally treated inside the muffle furnace at 600°C for 5hrs to remove the carbonaceous matter and increase the silica (SiO2) content. The thermally treated RHA was later mixed with 3M NaOH as soda source and heated with continuous stirring inside a heating glass vessel placed in a thermostatic water bath at 70°C for 4hrs, 80°C for 3hrs, and 90°C for 2hrs respectively. Physical analyses such as Viscosity, PH, Specific gravity, and Electrical conductivity were carried out on the extracted sodium silicate which was compared with the reference sodium silicate sample.
Highlights
Sodium silicate solutions are complex mixtures of silicate anions and polymer silicate particles of SiO2: Na2O molar ratio >2 which are commercially referred to as water glass [1]
The process of producing Na2SiO3 comprises basically four main stages as stated by [2]: (1) calcinations of a mixture of Na2CO3 and SiO2 in furnace at 1400°C -1500°C to obtain a solid glass; (2) Dissolution of the solid glass produced in a reaction vessel subjected to high pressure and temperature to produced Na2SiO3 solution and impurities; (3) Optimal filtration depending on the purity desired, (4) Evaporation of water from the silicate solution for the production of solid sodium silicate
Three samples A, B, and C measuring 30 gram each was weighed from the obtained heat treated rice husk ash which were later reacted with concentrated sodium hydroxide and boiled in an heating glass vessels at temperature of 70°C, 80°C, 90°C for 2hrs, 3hrs, and 4hrs respectively
Summary
Sodium silicate solutions are complex mixtures of silicate anions and polymer silicate particles of SiO2: Na2O molar ratio >2 which are commercially referred to as water glass [1]. The process of producing Na2SiO3 comprises basically four main stages as stated by [2]: (1) calcinations of a mixture of Na2CO3 and SiO2 in furnace at 1400°C -1500°C to obtain a solid glass; (2) Dissolution of the solid glass produced in a reaction vessel subjected to high pressure and temperature to produced Na2SiO3 solution and impurities (not reacted silica); (3) Optimal filtration depending on the purity desired, (4) Evaporation of water from the silicate solution for the production of solid sodium silicate This process is considered to be very expensive due to the high energy required to achieve a high temperature calcination reactions in addition to generation of air pollution from emission of dust particles, SO2, and Nitrogen. Reaction was carried out in a glass reaction vessel under atmospheric pressure while the closed system was carried out under temperature and pressure inside an autoclave This present work aimed to produce soluble sodium silicate from rice husk ash at different temperature and time interval employing the adapted method stated by [16]. The effects of these parameters (temperature and time variations) on the properties such as viscosity, PH, specific gravity, electrical conductivity, and the characteristics of the sodium silicate produced were investigated
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