| US 7,482,384 B2 | ||
| Iron composite particles for purifying soil or ground water, process for producing the same, purifying agent containing the same, process for producing the purifying agent and method for purifying soil or ground water | ||
| Masayuki Uegami, Ube (Japan); Junichi Kawano, Onoda (Japan); Koji Kakuya, Ube (Japan); Tomoko Okita, Hatsukaichi (Japan); and Kenji Okinaka, Ube (Japan) | ||
| Assigned to Toda Kogyo Corporation, Hiroshima-Ken (Japan) | ||
| Filed on Jun. 08, 2004, as Appl. No. 10/862,899. | ||
| Claims priority of application No. 2003-165812 (JP), filed on Jun. 10, 2003. | ||
| Prior Publication US 2006/0151398 A1, Jul. 13, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A62D 3/34 (2007.01); B01F 3/12 (2006.01); C02F 1/72 (2006.01) | ||
| U.S. Cl. 516—95 [252/178; 510/370; 510/418; 516/88] | 12 Claims |
| 1. A purifying agent for soil or ground water, comprising a water suspension containing as an effective ingredient iron composite particles comprising α-Fe and megnetite, and having a ratio of a diffraction intensity D110 of (110) plane of α-Fe to a sum of a diffraction intensity D311 of (311) plane of magnetite and the diffraction intensity D110(D110/(D311+D110) of 0.30 to 0.95 as measured from X-ray diffraction spectrum of the iron composite particles, an Al content of 0.10 to 1.50% by weight and an S content of at least 3500 ppm, a saturation magnetization value of 85 to 155 Am2/kg, a BET specific surface area of 5 to 60 m2/g, a crystallite size of (110) plane of α-Fe of 200 to 400 Å, an Fe content of not less than 75% by weight based on the weight of whole particles. |