Treating Asbestos Patents (Class 423/167.1)
  • Method for preventing asbestos from freeing airborne particles
    Patent number: 6929200
    Abstract: The method for preventing asbestos from freeing airborne particles comprises sequentially heating and the asbestos in the following surrounding temperatures values and maintaining the asbestos in these surrounding temperature values until the asbestos changes to the following corresponding colors: a) between 125° F. (52° C.) and 175° F. (79° C.) until the asbestos changes to a uniform pale russet-red color; b) between 225° F. (107° C.) and 275° F. (135° C.) until the asbestos changes to a uniform dark russet-red color; c) between 325° F. (163° C.) and 375° F. (191° C.) until the asbestos changes to a uniform dark orange color; d) between 425° F. (218° C.) and 475° F. (246° C.) until the asbestos changes to a uniform red color; e) between 525° F. (274° C.) and 575° F. (302° C.) until the asbestos changes to a uniform grey color; and f) between 625° F. (329° C.) and 675° F. (357° C.) until the asbestos changes to a uniform opaque white color.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: August 16, 2005
    Inventors: Luc Bouchard, Lisette Voisine
  • Non-ionic foam composition for treating asbestos-containing materials and method of using same
    Patent number: 6589156
    Abstract: A composition for transforming a chrysotile asbestos-containing material into a non-asbestos material is disclosed, wherein the composition comprises water, at least about 30% by weight of an acid component, at least about 0.1% by weight of a source of fluoride ions, and a stable foam forming amount of a foaming agent system composed of a non-ionic alkyl polyglycoside alone or with additional non-ionic foaming agents. A method of transforming the asbestos-containing material into a non-asbestos material using the present composition in the form of a foam also disclosed.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: July 8, 2003
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Lawrence Joseph Kindt
  • Process for the treatment of waste containing asbestos
    Patent number: 6391271
    Abstract: A method for processing asbestos-containing waste from a waste generating site, wherein the waste is transferred from the site to a processing reactor without exposing the waste to an external environment, a basic reaction solution is fed into the reactor, a reaction is carried out to give a substantially fiber-free reaction product, and the reaction product is separated into a solid phase and a liquid phase. The separated liquid phase is optionally recycled to form the basic reaction solution and the separated solid phase is optionally recovered to enable upgrading thereof.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: May 21, 2002
    Inventor: Gérard Jean-Marie Debailleul