Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1999-01-26
2000-05-30
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209169, 2102212, B03D 114, B03D 116, B03D 124
Patent
active
060681322
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a perfected reactor suitable for realising liquids purification, particularly suitable for realising the de-inking of aqueous suspensions of recycled paper.
As it is known, fittings, which, using the flotation, realise the de-inking of fibrous suspensions of recycled paper, are used in the paper working field.
In particular a reactor belonging to the known technique for liquids purification is described in the patent having reference number MI93A001455, registered on behalf of the same depositor of the present invention. Said reactor is substantially formed of a cylindrical tank in which the liquid to be purified is introduced by a sequence of injectors which are arranged in a circumference in comparison with the tank itself just below the free surface of the suspension to be purified.
The suspension to be purified is pumped in the tank through a feeding pipeline, in parallel to which, a suction pipeline which communicates with the outside, is arranged. The liquid through the feeding pipeline sucks air up from the outside, by Venturi effect, through the suction pipeline, in order that inside the tank an emulsion, formed of the suspension to be purified, in which air bubbles are dispersed, is introduced.
The air bubbles, helped by the presence of chemical reagents, capture the impurities present in the liquid and they carry them away, purificating it.
A first flotation, which leads to the formation of a foam loaded with impurities, is this way realised. Said foam rises towards the surface, where a rotating spatula conveys it towards an evacuation conduct, while the liquid comes down towards the bottom of the tank where a suction hood is present.
The liquid is therefore sucked up by said suction hood through further delivery pipelines connected in parallel to further suction pipelines, is re-introduced in an intermediate position in the tank by further injectors in order to undergo a second flotation.
This way the liquid already partially purified which, re-introduced in the tank, during the descent, undergoes a counter-washing by the air bubbles which rise and which are loaded again with the impurities, according to the same process previously described.
When the liquid re-enter for the second time in the suction hood arranged on the bottom of the tank, it has substantially finished its purification cycle, and by pumps is conveyed for the utilisation.
The known technique includes that the purification is always realised using two machineries of the described kind, arranged in a cascade connection and this in order to obtain an optimum purification of the liquid to be treated.
The present invention sets a purpose for realising a perfected reactor which, having the same dimensions of the reactors belonging to the known technique, and in particular of the reactor of the patent here mentioned, permits to realise the same degree of purification which, according to the known technique, is obtained using two of said reactors belonging to the known technique, arranged in a cascade connection.
The mentioned purpose is achieved by the realisation of a reactor for liquids purification which, according to the main claim, comprises: with said tank, in correspondence with the free surface of the liquid to be purified, suitable for introducing in the tank itself said liquid to be purified with an aeriform substance dispersed in it, in the from of bubbles; shaft suitable for set them on rotation in order to agitate said liquid in which they are immersed; means arranged on the bottom of said tank and suitable for sucking up and re-introducing in the tank in a lower position, in comparison with said upper injectors, the liquid itself with an aeriform substance dispersed in it, in the form of bubbles; liquid the foam formed by said bubbles loaded with the impurities captured from said liquid; arranged inside said tank at an intermediate height, suitable for receiving the descending liquid during the purification phase, being said low box supplied with second interception means suitable for permitting th
REFERENCES:
patent: 4431531 (1984-02-01), Hollingsworth
patent: 5335785 (1994-08-01), Kawatra et al.
patent: 5454935 (1995-10-01), Magaraggia
patent: 5650044 (1997-07-01), Serres
Comer SpA
Lithgow Thomas M.
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