Cleaning and liquid contact with solids – Processes – Including work heating or contact with combustion products
Patent
1995-01-24
1997-10-07
El-Arini, Zeinab
Cleaning and liquid contact with solids
Processes
Including work heating or contact with combustion products
134 251, 134 30, 134 32, 134 33, 134 34, 134 35, 134 10, B08B 300, B08B 306, B08B 310
Patent
active
056743246
ABSTRACT:
An improved method for heating the aqueous slurries of soils contaminated with tarry/oily organics and volatile compounds. The method includes the steps of heating the slurry (containing inorganic and carbonaceous solids below 1/8 inch) with atmospheric pressure steam in a specially designed slurry heater(s), contacting the hot (95.degree.-99.degree. C.) slurry with the contaminated feed soil (top size 5 inch) in a hydraulic feeder, processing the resultant slurry in a tumbler at temperatures up to 90.degree. C., separating the -1/8 inch solids from the slurry exiting the tumbler and recycling a portion of the -1/8 inch solids in slurry back to slurry heater(s). In order to reach the required temperature in the tumbler, the -1/8 inch slurry has to travel through the tumbler at mass flow rates 1.5-4.0 times higher as compared to those for the soil feed stream. Under such conditions, the fine (-1/8 inch) components of the soil are processed under more rigorous conditions (steam, high temperature, residence time, agitation) compared to large (1/8-5.0 inch) mineral components of the soil. This results in further improvement of thermal efficiency of the process.
REFERENCES:
patent: 4424081 (1984-01-01), Giguere
patent: 5019245 (1991-05-01), Ignasiak et al.
patent: 5172709 (1992-12-01), Eckhardt et al.
El-Arini Zeinab
Envirotech Consulting Inc.
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