Combustion treatment is one step, does not contain tar, crystallized substances, residual agricultural chemicals and carcinogenic substances, and is porous and easily soluble in water, amorphous silicon used for foods, pharmaceuticals, cosmetics, feeds, and its A manufacturing method and apparatus is obtained. While stirring rice husk etc. in a temperature range of 500 ° C. or higher and 700 ° C. or lower, the mass of 6.7 times or more and 20 times or less the weight of the rice husk etc. or the weight of the rice husk etc. In contrast, 1.4 to 4 times or less oxygen gas or a mixture of air and oxygen (mixing ratio is in the above-mentioned range) is introduced into the furnace and burned. Porous and easily soluble in water, free of tar, crystals, residual agricultural chemicals and carcinogens, which is obtained by means of exhausting some of the dry distillation gas from the furnace to obtain combustion products such as rice husks A method for producing amorphous silicon, characterized by producing silicon.燃焼処理が１工程であって、タール、結晶物、残留農薬及び発がん性物質を含まず、また多孔質性で水溶化しやすい食品、医薬品、化粧品、飼料に利用される非晶質ケイ素、及びその製造方法と装置を得る。 もみ殻等を５００℃以上、７００℃以下の温度範囲にて、撹拌しながら、前記もみ殻等の重量の６.７倍以上、２０倍以下の質量の大気、または前記もみ殻等の重量に対して１.４倍以上、４倍以下の酸素ガス、または大気と酸素の混合ガス（混合比は前述の範囲内）を炉内に導入し、燃焼させると同時に、もみ殻等の熱分解時に生じる乾留ガスを一部炉内から排出させて、もみ殻等の燃焼物を得る手段で行われる、タール、結晶物、残留農薬及び発がん性物質を含まない、多孔質で水溶化し易い非晶質ケイ素を製造することを特徴とする非晶質ケイ素の製造方法とする。
