Fine-particle powder containing calcium oxide or calcium hydroxide and production method for same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsHisao Nagai, Hiroki Maruyama, Takeshi Koiwasaki, Takafumi Okuma
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Abstract
A method for producing a fine-particle powder containing calcium oxide or calcium hydroxide includes: preparing a pulverized powder of shells or eggshells; introducing the pulverized powder of shells or eggshells into a controlled atmosphere, vaporizing the pulverized powder under thermal plasma and then solidifying the pulverized powder in a gas phase to produce fine particles containing calcium oxide or calcium hydroxide; and collecting a powder of the fine particles containing calcium oxide or calcium hydroxide produced with the thermal plasma.
Claims7
A fine-particle powder containing calcium oxide or calcium hydroxide, wherein the fine-particle powder is composed of primary particles, a particle size of the primary particles is from 5 nm to 300 nm inclusive and a specific surface area of the entire fine-particle powder is equal to or more than 18 m2/g.
A fine-particle powder containing calcium oxide or calcium hydroxide, wherein the fine-particle powder is composed of primary particles, a particle size of the primary particles is from 5 nm to 300 nm inclusive, and a specific surface area of the entire fine-particle powder is equal to or more than 18 m2/g,
- wherein the primary particles are spherical particles having a smooth surface shape, and the fine-particle powder is a fine particle powder derived from seashells or eggshells.
Dependencies are inferred from the claim text.