Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1992-07-30
1994-08-30
Dawson, Robert A.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210747, 210787, 2102422, B01D 116
Patent
active
053425294
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a process for mechanical treatment of media in liquid to thin-slurry form. Many processes for mechanically treating media in liquid to thin-slurry form have become known; they are predominantly used in the fields of wastewater purification, water treatment, and the preparation of disperse mixtures. Turbulence is employed, particularly by means of rotors, to achieve intensive mixing of the starting components. Comminuting coarse components into smaller units is done to attain a high degree of dispersion.
In a known process of this type (German Published, Unexamined Patent Application DE-OS 32 41 011), the medium to be treated is fed from above into a funnel-like container; it flows through it from top to bottom by gravity and leaves it through a discharge opening provided at the lower end of the funnel. By means of this apparatus, a vortex-like turbulence is generated, which is intended to bring about intensive mixing of the components present in the medium, such as cement and water. This process has also been disclosed in a further development (German Published, Unexamined Patent Application DE-OS 33 25 952), in which a two-chamber system is used. The inner, funnel-like chamber again serves to make the medium that flows from top to bottom through the chamber by gravity turbulent; the outer chamber serves to return the medium leaving the inner chamber to the inlet opening of the inner chamber. For the return, a rotor supported in the vertical container axis is used; its vanes are located in the outer chamber underneath the discharge opening of the inner chamber, and it pumps the medium back to the inlet opening of the inner chamber counter to gravity.
These known processes have the disadvantage that the efficiency is not high enough to achieve an adequate degree of dispersion of the treated medium within reasonable periods of time. Despite the provision of propellers to reinforce the swirling action of gravity from suction and pumping, the energy input still remains too low.
In another known process (U.S. Pat. No. 4,628,391) for mixing a two-phase liquid mixture, the direction of circulation is reversed compared with the apparatus discussed above. The circulatory flow is brought about here, however, with a propeller or an impeller wheel, and the medium is aspirated from one chamber and ejected into a second chamber. The energy input is therefore too low to achieve an adequate degree of dispersion of the treated medium within reasonable periods of time.
OBJECT AND SUMMARY OF THE INVENTION
The object of the invention is therefore to further develop a generic process for mechanically treating media in liquid to thin-slurry form in such a manner that a high degree of dispersion of the components of the medium is attained within the shortest possible time. Moreover, the intensive mixing of the components of the medium is intended also to enable optional coagulation of components of the medium, in order to separate them from the remaining medium, for instance by sedimentation.
The process according to the invention has the advantage that by repeated spraying of the medium within a short time, a high energy input is possible, which leads to rapid dispersal of the components of the medium. Moreover, this treatment enables coagulation of certain components of the medium, so that they can be separated in the form of solids from the liquid components of the medium. The coagulation can be effected by clustering, for instance, which is promoted by the fine distribution of the components effected by the spraying apparatus.
Clustering is further promoted on the one hand, and the degree of distribution of the components of the medium is further increased on the other, by an advantageous further feature of the process of the invention, in which the medium to be treated is nebulized by the spraying device. In this nebulization, some liquid components of the medium change to the gas phase.
Pumping of the medium into the spraying apparatus can be done either by suction or by compression, in advanta
REFERENCES:
patent: 4268398 (1981-05-01), Shuck et al.
patent: 5085809 (1992-02-01), Stirling
Dawson Robert A.
Greigg Edwin E.
Greigg Ronald E.
Walker W. L.
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