DE3241470A1 - Process and equipment for the wet mixing of pulverulent solids or granules with liquids - Google Patents

Abstract

In a process for the wet mixing of pulverulent materials or granules with a liquid, the pulverulent materials or granules are supplied in transport containers. By means of a device, they are conveyed out of the transport containers and pass into a mixing section. This is followed by suspending. The suspension is received in a stocking tank. A device for carrying out the process consists of a suction section, a mixing section and a connected stocking tank. They form a constructional unit which is dust- and liquid-tight.

Description

Method and device for wet mixing of powdery

Solids or granules with liquids The invention relates to a method of wet mixing powdered solids or granules with Liquids and an apparatus for carrying out such a method.

In the case of solid-liquid separation, filtration, it is necessary that the separation takes place in the shortest possible time.

One way to speed up the filtration process is to use the separated Solids content - the filter cake - relative to keep permeable. This is achieved by continuously adding filter aids.

The filter aids such as kieselguhr, perlite, granulates, coal dust etc:. are usually delivered in powder form in sacks or other containers.

Up to now, the dissolving and mixing takes place in Containers partially filled with liquid, into which the filter aid is manually inserted is filled.

The disadvantage here is, on the one hand, that human strength is required is to lift the sacks to the opening of the mixing hardener and tear open the sack or cut open, creating a considerable amount of dust. This dust calls mainly damage to the health of the operating staff, which was also represents a significant disadvantage of the previous method. Continues to sit down this dust in nooks and crannies and causes 2U damage to rotating parts of e.g. engines due to its abrasive properties. To remedy this deficiency has therefore been used variously to filter aids in a separate, to be stored in a well-closed room in which a mixing container is also set up. From there, the finished suspension is conveyed to the Dosing device near the Filter device pumped. This is a rather expensive solution and only partially eliminates the problems.

It has already been suggested that filter aids be dust-free to bring from the transport containers into the mixing container, that you have the closed Place the sack on the filling opening of the mixing container, with the filling opening like this is built so that little congestion should escape to the side if the filter aid falls into the mixing container.

The disadvantage here is that the sack individually on the mixing container must be lifted and further - that there is still a dust escape in the area of the Bag opening occurs and that the bag is not completely emptied.

The invention is based on the object of a method for wet mixing of powdery substances or granules with a liquid and a device to carry out the process, with filter aids without generating any dust can be suspended and a simply designed system is used for this purpose will.

According to the invention, this object is achieved in the case of the method mentioned at the outset solved in that the powdery substances or granules in transport containers are delivered, by means of a device from the transport containers heraucgefördelt and pass into a mixing part, in which the suspension takes place and then be collected in a stacking container.

It is advantageous if the powdery substances or granules sucked out of the transport container via a suction system and in the form of dust a wet mixing plant with a mixing channel with nozzle device fall, here intensive mixed with the liquid and suspended.

It is also advantageous if the suspension liquid is in the mixing channel is atomized in a fine mist, and the liquid mist as more uniform Film like a liquid mushroom fills the entire mixing channel and the suspension well mixed.

In addition to liquid, inert gas can also advantageously be used be injected.

The object specified above is achieved according to the invention at the outset described device for wet mixing achieved in that a suction device with at least a nozzle channel contained in the mixing channel with a suspension and aeration device and connected stacking container, connected in a dust- and liquid-tight manner, a structural unit form.

In an advantageous embodiment, the suction device consists of at least a sintered candle, gap filter candle, bag filter or similar separation devices connected to the suction point via a suction hose and above the suspension part arranged. A valve seals the suction part and the suspension part (= mixing channel) against each other.

In a further embodiment, the mixing channel also contains a mixing part Ring channels and / or spray distributors, with the latter having any possible design and can have refinements.

It is also advantageous if the mixing part is on the underside a sealing disc or a domed sealing cap with a central outlet bore having, wherein a downpipe is arranged at the outlet bore.

The arrangement of the nozzle ducts according to the invention is more advantageous Way also inert gas e.g.

To blow in carbon dioxide or nitrogen. This gas injection can both simultaneously with the suspension liquid, e.g. water, and separately and take place independently of it.

In the proposed device there is a circulating device in the stacking container provided, which counteracts segregation of the suspensiona A in the stacking container specially arranged pipe system that is connected to the tank outlet via a pump is, the suspension moves in Whirl pool effect in two opposite directions Circular movements.

The device also allows a metering pump to be attached e.g. on the fitting of the stacking container, so that the acquisition costs for an extra metering device omitted.

Almost every Dosing pump (filter aid dosing pump) retrofitted to the proposed device plant.

The advantages achieved with the invention are procedural especially in the fact that it is now possible to emit powder-form solids or granules wet mixing without the previous disadvantages, while at the same time the in some branches of industry through harmful oxygen such as beer breweries Supply of inert gas is expelled from the mixed water.

The advantages of the device according to the invention are based on the fact that with relatively simple means it is possible to have a suction device in one structural unit with a suspension device and a stacking container, dust- and liquid-tight to integrate. This system can be set up in all filter rooms without that the employers' liability insurance association or health authority has any requirements are to be expected.

By eliminating mechanical agitators in the stackable container, which are subject to constant abrasion, the device can have a long service life Be predicted.

In addition, the device has facilities that were previously used similar devices were not available and only afterwards at great expense could be grown. Sa the proposed device can work continuously, and it can be fully automated. The necessary Mixing ratio between solid and liquid can be set exactly, so that the previous empirical determination of the consistency of the suspension is no longer necessary.

The feeding of full sacks can be done by robots, for example and conveyor belts and also integrate them into the automation circuit via several suction points.

Further advantageous developments and refinements result from the subclaims and the exemplary embodiments explained below with reference to the drawing.

The drawing shows: FIG. 1 the schematic representation of the device in side view; Fig. 2 An embodiment of the mixing channel with Suspension and fumigation equipment; Fig. 3 Ray path of the liquid film in the mixing channel; 3a shows a variant according to FIG. 3 of the liquid film in the mixing channel; 4 shows a suction device with vertical bag emptying; Fig. 5 A suction device with suction tube arranged diagonally to the container.

Fig. 6 Schematic representation in plan view of a possible embodiment the pumping device for the suspension in the stacking container.

Fig. 7 Schematic representation of the device in side view with a feed screw.

Fin. 1 shows the device with a suction part 1, a mixing part 3 2 and a stacking container 3 with container outlet 4. In the suction part 1 hang on the Carrier plate 6, suction cups 7 made of sintered material. The vacuum will Generated via a unit (not shown) and via a line 8, the carrier plate 6 placed on candles 7. The circumference of the suction part 1 is surrounded by a suction channel 9, to which a suction hose 10 is connected, which is connected to a suction tube 11 in the to emptying sack is stuck.

The suction part 1 has a discharge opening 12 with a balance valve 13. The balance valve 13 is the closing device for the discharge opening 12 and is operated by a switching element (not shown).

The mixing part 2, which is designed as a mixing channel, consists of two ring channels 14 and 15 arranged one above the other with liquid inlets 14a, 14b and 15a, 15b. There are gas connections on the liquid inlets 14a + 14b and 15a + 15b 14c + 15c attached.

Exit gaps or exit openings 16 + 17 for the suspension liquid or the gas are annular gaps or nozzles and are uniform over the entire annular channel arranged distributed.

The outlet openings of the annular gaps or nozzles 16 + 17 can both upwards in the direction of the discharge opening 12, as well as horizontally, and downwards in the direction Stacking container 3 should be directed towards the eye. It is also possible to direct the annular gaps 16 upwards in the direction of the dropout opening 12, while the annular gaps 17 are aligned horizontally or downwards in the direction of the stacking container 3 are. However, other variations are also possible.

The mixing part 2 with the ring channel 15 is towards the stacking container 3 with a closure disk 30 with a central outlet opening 31 is provided. At the outlet opening 31 a downpipe 32 is attached.

From the container outlet 4, a line 18 leads to the circulating pump 19, which leads via line 18a to the schematically illustrated pipe system 20 to the stirring effect 33 to generate in the stacking container. A line 5 leads from the line 18a to the point of consumption. It is possible to connect the metering device to line 5 via a coupling piece.

Fig. 2 shows a variant of the nozzle device. in the mixing part 2 there can also be spray heads 21 and 22, which are connected via lines 21a and 22a with liquid or

Gas e.g. carbon dioxide. These '£ spray heads 21 and 22 can be used with the outlets 1 £ and 17 either simultaneously or separately be operated.

In Fig. 3, the course of the spray in the mixing part 2 is according to the embodiment shown in fig. Over the entire circumference of the upper annular channel 14 are exact defined column or fine nozzles arranged so that a closed roof-shaped Spray in the direction of the discharge opening 12 of the suction part 1 extends. At the bottom Annular channel 15 is the gap or nozzle arrangement exactly a mirror image of the upper one Ring channel 14 formed so that a downwardly directed towards the stacking container 3 A closed roof-shaped spray film is created.

Fig. 3a shows an embodiment in which the annular gaps 16+ 17 of the annular channels 14 + 15 are both directed downwards and both liquid mushrooms radiate into the mixing channels 2.

Fig. 4 shows a suction device in which the sack to be emptied 23 is placed vertically on a pallet 24 with a holding device 25. The suction pipe 11 sucks the powdery solid 26 out of the interior of the sack. That Suction pipe 11 is mounted eccentrically in a wheel 27. By turning the wheel 27- the suction tube becomes circular in the direction of arrow 28 through the inside of the bag moved, for the purpose of even and complete emptying, pulsators or vibrators 29 on the pallet 24 support the better sliding of the sack contents In Fig. 5 shows a suction device in which the bag to be emptied on an inclined plane is so that the suction tube 11 is diagonally in the bag, so that the contents of the sack are supported by pulsators or vibrators at the tip of the sack, the deepest Point converges and can be completely sucked out from there.

The eccentric movements of the suction tube inside the bag can omitted here.

A possible embodiment of the pumping device is schematically shown in FIG. 6 the suspension in the stacking container 3 shown in plan view.

A line 18 leads from the container outlet 4 of the stacking container 3 to the pump 19, which is arranged horizontally to the container bottom via the line 18a Pipe system 20 leads.

The inventive device works as follows: By the The pulverulent solid 26 from the sack 23 is exerted under a vacuum in the suction part 1 Pulled into the suction part 1 via the suction pipe 11 and the line 10, finely distributed, where it attaches to the suction cups 7. A switching element interrupts in predetermined Interval the vacuum so that the finely distributed solid adhering to the candles 7 can fall off. A counter-blow gas shock against the suction direction can result in the discharge support.

The discharge opening 12 is during the suction process through the balance valve 13 closed. It is automatically opened by a stopper at the moment where the vacuum is broken. Through the outlet opening 12 with the balance valve 13 the powdery solid falls onto the roof-shaped, upwardly directed liquid mist of the upper ring channel 14 and mixes with this immediately and very intimately and suspends the powder. Then this suspension falls into the area of the lower one Ring channel 15 and meets there on the roof-shaped about 1800 downward Liquid mushroom. The lower mixing channel with an annular channel 15 is provided with a closure disk 30 locked. Because the closure disk 30 only dimensioned a central housing Has outlet opening 31 through which the suspension can drain into the stacking container, the suspension has to linger in this mixing part for some time and is thereby again Strongly mixed. The finished suspension is placed in the stacking container below collected and kept in motion by pumping.

This causes the solids to sediment and separate prevented.

The suction process, the throwing off of the powder and the mixing are carried out cyclically controlled via a switching device, without manual operation.

Since oxygen-containing water is harmful in various branches of industry can be, it is advantageous to use the mixed water by means of metered inert gas of oxygen to free, whereby oxidations in the filter medium and / or filtrate are avoided. To avoid rewetting, the suction part 1 is separated from the mixing part 2 a mechanical conveyor 40 is separated as shown in FIG. The conveyor 40 can preferably consist of a feed screw. But it can also do the same a piston or belt conveyor or an inclined plane with a vibrator be provided.

This measure has the advantage that from the mixing part 2 no spray water in the suction part 1 during the suction process due to the negative pressure reaches the suction part 1.

This means that the wet and dry areas are safely separated from each other.

The conveyor 40 consists of a surrounded by a dust-tight Housing 41, in which a worm 42 runs.

The worm spindle 43 is conical so that it extends from the inlet opening 44 is initially reduced, specifically until shortly before the discharge opening 45, from where it extends cylindrically to the other end of the housing 41.

The drive motor 46 is also provided here.

The worm 42 is only arranged on the conical spindle area; the cylindrical part is essentially without a helix, only at the spindle end of the cylindrical Partly t a short, three-turn, counter-rotating worm arranged.

It is also possible to make the screw 42 in a cylindrical shape, wherein the screw 42 at its end has a cone or similar regulating elements.

The powdery fallen from the suction part 1 through the incidence opening 44 Solid 26 is compressed in volume in the conical spindle area and occurs as a plug 48 in the cylindrical part. This plug 48 is from the following The compacted solid is pushed further into the area of the discharge opening 45, from where it then falls into the mixing part 2. The counter-rotating worm 47 ensures ensuring that all of the compacted solid falls evenly into the mixing section.

The plug 48 formed with this additional feed screw creates not just a safe separation between the wet and dry areas, but its seal increases the vacuum in the suction part 1, through which a continuous suction of the powdery solids 26 can be achieved can.

Another advantage is that any possible splash water only the reached the front area of the plug 48, but not the remaining solid in the Funding area in the screw 42.

It is of course possible to go through with this feed screw the circulation speed to regulate the flow rate and so a continuous To enable promotion or interference. It is also possible with and without a balance valve 13 to work continuously or alternatively in cyclic operation.

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Claims (32)

PATEN TA N 5 P R ü C H E: 1) Process for wet mixing of powdery Substances or granulates with a liquid d a d u r e c h e n n e i c n e t ,, that the powdery substances or granulates are in transport containers delivered are conveyed out of the transport containers by means of a device and pass into a mixing part, in which the suspension takes place and then be collected in a stacking container. 2) Method according to claim 1 d a d u r c h g e k e n n z e i c h n e t that the powdery substances are sucked in and dusty in a mixing part fall and are intensely mixed and suspended therein. 3) Method according to claim 1 and 2 d a d u r c h g e k e n n z e i c h n e t that the powdery substances on a liquid film or a fine atomized liquid mist fall. 4) Method according to one of the preceding claims 1-3, d a d u r c h g e k e n n z e i c h. n e t that the liquid film has an intense, on the powdery substances or granules that trickle down to be suspended are targeted Has direction and the suspension is mixed vigorously. 5) Method according to one of the preceding claims 1-4, d a d u R e k e k e n n n e i n e t that the liquid film is facing upwards der: Direction of fall of the powdery solids or granules is directed. 6) Method according to one of the preceding claims 1-5, d a d u it is noted that the liquid film is simultaneously upwards against the direction of fall of the powdery solids or granules and roof-shaped pointing down towards the stacking container. 7) Method according to one of the preceding claims 1-6 because you u r c h e k e k e n n n n e n e t that the liquid fog is only roof-shaped downwards is directed. 8) Method according to one of the preceding claims 1- 7 d a d u r It is noted that the liquid mist is atomized in the shape of a sphere. 9) Method according to one of the preceding claims 1-8 d a d u r e k e k e n n n z e i n e t, - that inert gas is also blown in. 10) Method according to one of the preceding claims 1-9 d a d u notices that both carbon dioxide and water are separated and is also injected as a mixture. 11) Device for wet mixing of powdery substances with liquids for carrying out the method according to one of claims 1 to 10 d a d u r c h g It is not noted that a suction part (1) with at least one in the mixing part (2) arranged mixing channel with a suspension and aeration device (16 + 17, 21 + 22) and a connected stacking container (3) dust and liquid-tight connected to form a structural unit. 12) Device according to claim 11 d a d u r c h g e k e n n z e i c h n e t that the suction part (1) with at least one extraction point (9,10,11) and at least one sintered candle (7) or a clear filter, gap filter candle or the like, vacuum-tight connected is. 13) device according to one of the preceding claims 11 and 12 d a d u r c h g e k e n n n z e i c h n e t that between the suction part (1) and the mixing part (2) a discharge opening (12) with a sealing valve (13); is arranged. 14) Device according to one of the preceding claims 11-13 da d u r c h g e k e n nz ei c h n et that the mixing part (2) is designed as a mixing channel is. 15) Device according to one of the preceding claims 11-14, d a it is indicated that the mixing part (2) has ring channels (14, 15). 16) Device according to one of the preceding claims 11-15, d a D u r c h g e k e n n t show that the ring channels (14 + 15) are liquid inlets (14a + 14b, 15a + 15b) and gas inlets (14c + 15c) and as outlet openings, Annular gaps or nozzles (16 + 17) included. 17) Device according to one of the preceding claims 11-16, d a it is indicated that the annular gap or the nozzles (16 + 17) and the spray heads (21 + 22) have outlet openings arranged in different ways. 18) Device according to one of the preceding claims 11-17, d a D u r c h g e k e n n n n e i c h n e t that the annular gaps or nozzles (16) of the annular channel (14) are arranged so that the liquid has a roof-shaped upward direction Form a liquid film. 19) Device according to one of the preceding claims 11-18, d a d u r c h g e k e n n n z: e i c h n e t that the annular gaps or nozzles (17) of the annular channel (15) so are arranged that the liquid is about 1800 after Form a downward-facing liquid mushroom. 20) Device according to one of the preceding claims 11 -. 19, d a d u r c h g e k e n n n z e i c h n e t that the mixing part (2) with ring channel (15) towards the stacking container (3) a closure disc (34 with a central outlet opening (31), whereby a closed mixing part (2) is formed and that on a downpipe (3p) is arranged at the outlet opening (31). 21) Device according to one of the preceding claims 11-20, d-a d u r c h e k e n n n n z e i c h n e t that the closure disc (30 of the closed Mixer divides several bores, slots or the like. Has an outlet opening (3t. 22) Device according to one of the preceding claims 11-21, d a D u r c h e k e n n n n z e i c h n e t that at the lower closed mixing part (2 instead of a closure disc (3d a curved closure cap with a central outlet opening (31) with downpipe (32) arranged 1 t 23) device according to a of the preceding claims 11-22, d u r c h g e n n n z e i c h n e t that the curved cap has a lateral tangential inlet for another Has feed for mixed liquid. 24) Device according to one of the preceding claims 11-23, d a d u r c h e k e n n'z e i c h n e t that a pump-over device for the content of the stacking container (3) is available. 25) Device according to one of the preceding claims 11-24, d a D u r c h e k e n n n n e i c h n e t, that in the middle of the container bottom at the outlet (4) a circulation line (18,18a) is connected. 26) Device according to one of the preceding claims 11-25, d a It is indicated that the pipe system in the stacking container (3) (20) from two circles in the vicinity of the container bottom in opposite directions, parallel and mirror images arranged individual tubes. 27) Device according to one of the preceding; Claims 11-26, d a d u r c h g e k e n n n z e i c h n e t that from the line (18a) a line (5) is provided for attaching a metering device. 28) Device according to one of the preceding claims 11-27, d a it is indicated that the suction pipe (11) of the suction device is retracted diagonally into the sack (23) standing on an inclined plane. 29) Device according to one of the preceding claims 11-28, d a d u r c h e k e n n n z e i c h n-e t that the suction tube (11) of the suction device is mounted eccentrically on a wheel (27.). 30) Device according to one of the preceding claims 11-29, d a It is noted that pulsators (29) are used to shake the pulverulent Substances or granules are provided for the suction pipe (11). 31) Device according to one of claims 1 = 30, d a d u r c h g e k e n n n z e i c h n e t that between the suction part (1) and the mixing part (2) a mechanical conveyor (40) is arranged, which the NaFteil from the dry part separates. 32) Device according to claim 31, d a d u r c h e k e n n z e i c h n e t that the conveyor (40) is a feed screw.