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Rice H usks B efore A nd A fter S team E xplosion (SE)

Explore how rice husks, after steam explosion, turn into high-tech materials like nano-ceramics, sorbents, and carbon ceramics. Learn about the process, products, and characteristics, creating valuable resources from waste.

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Rice H usks B efore A nd A fter S team E xplosion (SE)

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  1. Rice Husks Before And After Steam Explosion (SE) Rha: rhamnose; Ara: arabinose; Xyl: xylose; Man: mannose; Glc: glucose; Gal: galactose (as anhydro sugars) Lignin (AcBr: lignin determined by acetyl bromide method * - Extracted with water and dioxan (90%)

  2. The Basic Components Of Rice Husks Ash

  3. Concentration Of Minor Metallic Components In Rice Husks Ash (mg/kg)

  4. High Tech Materials From Rice Husk • Si (?) • nano-ceramics • alaoxy silicons • exceptionally selective and voracious nano-sorbents • carbon ceramics

  5. CO → CO2 OXIDES RICE HUSKS (SiO2) T Si O2 SiO2 + 2C → Si + 2CO

  6. LOW TEMPERATURE PLASMA RICE HUSKS PRODUCTS: nano-powders (20-100 nm) β – SiC α -, β – Si3N4, X-ray amorphous nano-ceramics PLASMATRON

  7. FT IR Spectra of Rice Husks

  8. Precursors SSA, m2/g N, wt.% C/Si XRD Rice husk 42 3.9 0.56 -SiC Rice husk+SiO2 21.8 3.1 0.37 -SiC Rice husk+Si 20.7 4.5 0.38 -SiC Characteristics of produced products

  9. Experimental The nanosize nitride or oxide based composites are prepared by evaporation of coarse commercially available powders of chemical elements and their compounds and subsequent condensation of products into a radio frequency inductively coupled nitrogen or oxygen plasma (ICP). The elaborated experimental apparatus (Fig. 1) consists of radio-frequency (5.28 MHz) oscillator with maximum power of 100 kW, quartz discharge tube with induction coil, raw powder and gas supply systems, water cooled stainless steel reactor and heat exchanger, and cloth filter for collecting powders. Optimal parameters of the radio-frequency oscillator and parameters of the plasma are determined by calorimetric methods. The growth of product particles and their phase and chemical composition are regulated by changing the velocity of the plasma flow and introducing cold gas (ammonia, hydrocarbon, hydrogen, air) into vapours. The process is optimised by studying the dependence of the particle size, their phase and chemical composition, and the production rate on the flow rate of plasma and cooling gases, the feeding rate of precursor powders, parameters of the plasma flow. The chemical and phase composition of prepared powders is determined by conventional chemical and X-ray powder diffraction analysis. The specific surface area of powders is determined by the BET argon adsorption-desorption method but the shape of particles by transmission electronic microscopy

  10. Acknowledgements Many thanks to my colleagues: Oskars Bikovens, Andris Vēveris and the one of leading experts of low temperature plasma physics and tehnology Academician of the ALS Jānis Grabis. The research was done withouth any financial support

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