US 11,850,664 B2
Silicified modified zero-valent iron and its preparation method and application
Minda Yu, Beijing (CN); Mingxia Zheng, Beijing (CN); Beidou Xi, Beijing (CN); Jing Su, Beijing (CN); Yuanyuan Sun, Beijing (CN); and Xiaosong He, Beijing (CN)
Assigned to CHINESE RESEARCH ACADEMY OF ENVIRONMENTAL SCIENCES, Beijing (CN)
Filed by CHINESE RESEARCH ACADEMY OF ENVIRONMENTAL SCIENCES, Beijing (CN)
Filed on Oct. 15, 2021, as Appl. No. 17/451,151.
Claims priority of application No. 202011112107.7 (CN), filed on Oct. 16, 2020; and application No. 202011112108.1 (CN), filed on Oct. 16, 2020.
Prior Publication US 2022/0118516 A1, Apr. 21, 2022
Int. Cl. B22F 9/24 (2006.01); B22F 9/04 (2006.01); C02F 1/70 (2023.01); C02F 101/34 (2006.01)
CPC B22F 9/24 (2013.01) [B22F 9/04 (2013.01); C02F 1/705 (2013.01); B22F 2009/043 (2013.01); B22F 2201/10 (2013.01); B22F 2301/35 (2013.01); C02F 2101/345 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for preparing a silicified zero-valent iron, comprising:
mixing a silicate and micron-sized iron powder in proportion to form a mixture; and
ball milling the mixture under an inert gas atmosphere to obtain the silicified zero-valent iron comprising a surface layer of a silicon containing oxide;
wherein the silicate comprises one of sodium silicate, potassium metasilicate, a layered crystalline sodium disilicate, a layered crystalline potassium disilicate, or a mixture of two or more thereof, and
wherein a ratio of the silicate to the micron-sized iron powder is from 0.02 to 20% based on a molar ratio of silicon to iron.