Agitating – Having specified feed means – Liquid injector within mixing chamber
Patent
1995-06-23
1997-04-15
Jenkins, Robert W.
Agitating
Having specified feed means
Liquid injector within mixing chamber
366144, 366221, 366224, B01F 902, B01F 1502
Patent
active
056202512
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a compacting granulator for continuous, compacting granulation and possible simultaneous mixing of at least one powdery or pasty material under supply of at least one fluid in a drum.
In many industries producing or handling powdery materials a granulating or agglomerating treatment is performed for making the materials less dusty, to increase their flowability, to make them easier to dose or in general easier to handle or to give them a desired appearance, by which treatment the primary particles and/or small agglomerate granules are united for the formation of bigger agglomerate granules. It may also be of interest to produce granulate on the basis of pasty starting materials, possibly with the addition of dry, powdery components.
Examples of such industrial branches, in which such processes take place, are the detergent industry, the fertilizer industry and the food, drink and tobacco industry as well as the pharmaceuticals industry and the metallurgical industry.
The attainment of agglomerated particles is achieved by use of widely differing measures either as part of a drying or production process or as a pre-treatment and by use of binding forces which are either present spontaneously or provided by the supply of suitable liquid or vaporous auxiliary means.
Many agglomeration processes, as for instance those performed in connection with a spray drying or a subsequent treatment in a fluidized bed, however, entail a reduction of the powder density of the material, also called the bulk weight, which in respect of a lot of products is undesirable, i.e. on account of increased packing and transport costs. To this may be added that the consumers wishes for instance within the detergent area tend to go towards more concentrated products, for the production of which components with relatively high powder density are used.
It is known that in connection with the selection of detergent components in a particular ratio, by mechanical treatment of the powdery material derived from spray drying by addition of a tenside acting as a binding agent, a detergent agglomerate with increased powder density is obtained, presumably because the mechanical treatment results in dense agglomerates with comparatively little interspace air between the primary particles.
Such a treatment is disclosed in published Danish Patent Application No. 1823/89, in which it is proposed to perform the agglomeration or the granulation while the material passes through a horizontal or slightly tilting mixing drum, in the interior of which a central, rotatable shaft is provided, the shaft carrying several radially directed impact tools. The mixing drum itself is stationary, and the passage of the material through the drum is therefore exclusively controlled by the impact tools.
Related apparatuses are known which have a horizontal, rotating mixing drum, in which a stirring shaft, which is parallel to the axis of the cylinder, but positioned under and at the side thereof, rotates in the same direction as the drum, see Japanese Patent Application 79-23438 (publication no. 80-116690). The described apparatus is for use in the manufacture of phosphate fertilizer with a surface layer of water-soluble phosphoric acid, the most important task being to distribute the liquid phosphoric acid on the phosphate granules. Inter alia as a consequence of the fact that the mixing shaft is adapted to rotate fairly slowly and that the design of the apparatus does not make an effective control possible of the staying time of the material in the apparatus and consequently the particle size, it will be obvious that this known apparatus is not suited for a real compacting granulation for the attainment of dense agglomerate particles with high density. Furthermore, the apparatus is not suited for treating material which consists of so small particles, that it is not flowing freely.
In addition to this many mixing apparatuses are known, in which large shear forces are exerted on the material to be mixed (high shear
REFERENCES:
patent: 3528781 (1970-09-01), Riggert
patent: 3988114 (1976-10-01), Gorin
patent: 4046496 (1977-09-01), Gorin
Funder Christian R.
Hansen Morten M.
Hansen Ove E.
Hein Torben
Larsen Tage M.
Jenkins Robert W.
Niro A/S
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