Several ash features obtained from rice husk

Annual production of rice in the Republic of Macedonia is 19 000 - 35 000 t, bearing in mind that about 22% of the mass belongs to rice husk. Even though rice husk is rich with silica and has high caloric value, in our country is treated as a waste, its disposal is serious problem for processors. Rice husk ash (RHA) is one of the most silica, rich raw material containing about 85-95% silica after a complete combustion. In the past, combustion was the only way rice processors handled it, without taking into account the consequences for the environment. Certain quantities of ash obtained by uncontrolled combustion exist at the landfills. In this work characteristics at RHA, obtained by uncontrolled combustion are examined. It is a snow-white powder with a low density (about 130 kg / m3), and the dimensions of the particles are between 100 and 200 microns (measured by laser granulometry). Compared with the density of a sand, silica particles with similar dimensions is 1460 kg/m3 [ ] which indicates a highly porous structure of RHA. X-ray diffractograms and FTIR spectra indicate an crystal silica structure. X-ray fluorescence spectra, show the large presence of Silicon, and small quantities of Aluminum and Iron in RHA. These characteristics of RHA gives opportunity for its use as filler absorbents and further processing in more sophisticated and high cost silica materials