Integrated Processing of Rice Hulls for Production of Polyfunctional Materials

Corby G Anderson, SV Yefremova

Abstract

The following method has been proposed for processing the rice hulls with producing materials of polyfunctional purpose that includes the washing, drying, and pyrolysis of the raw materials, and condensation of the vapor-gas mixture. The solid product – nanocomposite produced by densely packed carbon nanoparticles (~500 Å) and silicon dioxide (100÷200Å), which were present in the amorphous form in number of ~52.0% and ~35.0% respectively, proved to be advanced filler for elastomers, sorbent for recovery of precious and rare metals, and fodder supplement for the farm poultry. The organic product (aqueous solution of carboxylic acids (22%), phenols (14%), ketones (12%), cyclic aliphatic hydrocarbons (4.5%), heterocyclic compounds (4%), and spirits and esters (4.5%)) is a high-selective collector to the lead minerals when beneficiating complex rebellious ores, plant growth stimulant used on the non-productive soils and an antiseptic agent. The mixture of non-condensable gases (percent by volume: СН4~ 40÷45;С2Н4~ 4÷6; СО 2 ~ 20÷22; СО ~ 22÷24; Н2~ 4÷6) can be used for producing carbon black or as a high-calorific fuel