Ultrasonic conditioning and wet scrubbing of fly ash

B - Operations – Transporting – 03 – B

Patent

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Details

B03B 1/00 (2006.01) B02C 19/18 (2006.01) B03B 9/04 (2006.01) B03D 1/00 (2006.01) B03D 1/02 (2006.01) C04B 18/08 (2006.01) C04B 20/02 (2006.01)

Patent

CA 2292634

Process for treating fly ash to enhance the fly ash as a pozzolan for portland cement mixes and to separate therefrom a substantial carbon compound and/or to increase the fineness of the fly ash includes the treatment of fly ash slurry with ultrasonic energy using ultrasonic horns (12) immersed in a slurry of fly ash and water and imparting to said slurry such ultrasonic energy as to cause microscopic cavities to form and implode with high localized energy to break up fly ash agglomerations along cleavage lines and to break up carbon particles and matrices which have entrapped fly ash microspheres therein to release microspheres into the slurry.

Cette invention se rapporte à un procédé de traitement des cendres volantes, qui vise à améliorer le caractère pouzzolanique des cendres volantes en vue de leur incorporation dans des mélanges de ciment Portland et à séparer des cendres volantes les composés de carbone et/ou à accroître la finesse des cendres volantes. Ce procédé consiste à traiter une suspension épaisse de cendres volantes par ultrasons en utilisant des cornes (12) de projection d'énergie ultrasonore immergées dans une suspension épaisse de cendres volantes et d'eau et à appliquer à cette suspension épaisse une énergie ultrasonore suffisante pour amener des cavités microscopiques à se former et à imploser avec une énergie localisée élevée, afin de désagréger les agglomérats de cendres volantes le long de leurs lignes de clivage et afin de désagréger les particules et les matrices de carbone dans lesquelles sont piégées les microsphères de cendres volantes, de manière à libérer les microsphères dans la suspension épaisse.

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