RICE HUSK COAL OR RICE STRAW COAL INCLUDING ABUNDANCE OF AMORPHOUS SILICA, METHOD FOR MANUFACTURING RICE HUSK COAL OR RICE STRAW COAL INCLUDING ABUNDANCE OF AMORPHOUS SILICA, AND FOOD, AGRICULTURAL FERTILIZER, AND FODDER EACH INCLUDING ABUNDANCE OF AMORPHOUS SILICA

摘要

PROBLEM TO BE SOLVED: To provide a rice husk coal or rice straw coal including an abundance of amorphous silica which includes an abundance of water-soluble amorphous silica but includes no carcinogenic substances; a method for manufacturing a rice husk coal or rice straw coal including an abundance of amorphous silica; and a food, an agricultural fertilizer, and a fodder each including an abundance of amorphous silica.SOLUTION: The provided rice husk coal or rice straw coal including an abundance of amorphous silica is obtained by carbonizing rice husks or rice straws within an oxygen-free atmosphere by using a carbonizing apparatus for executing carbonization in an agitated state, whereas the rice husk coal or rice straw coal is obtained by confining, to 500°C to 700°C, the temperature range for carbonizing the rice husks or rice straws within the carbonizing apparatus. Moreover, a method for manufacturing amorphous silica wherein the rice husk coal or rice straw coal is agitated within a body of ion-exchanged water within a range of 30 to 100°C so as to dissolve and extract, into and with the ion-exchanged water, amorphous silica included within the rice husk coal or rice straw coal is also provided.