DE1119792B - Device for at least partial dewatering of fine grained goods - Google Patents

Description

The invention relates to a device for at least partial dewatering of fine-grained material, which from a channel with a bottom provided with sieve holes, furthermore from a and pushing pushing element, the stroke length of which is smaller than the effective length of the screen surface, and consists of feed means for the feed material. Such devices are from the German patent 120 839 known.

These known devices, which are in a ge ίο know number are set up one after the other, are mainly used to transport the goods, where liquid present in this material can flow away through the sieve holes if possible. the The stroke length of the impact element is only slightly shorter than the length of the screen surface. With every stroke therefore, most of the material on the sieve surface is removed immediately. The one present in the property Liquid has only a small possibility of separating from the solid particles.

The invention is based on the knowledge that the sieving off of liquid is significantly improved can be moved if the feed material is moved under the influence of brief impact movements over the sieve surface will.

For this purpose, according to the invention, the maximum stroke length is a quarter of the length of the sieve surface, and preferably a stroke length which is one tenth of the effective screen length or less is used is.

When the pushing element moves forward, the abandoned good is each time a short distance in the direction pushed onto the exit end of the screen surface. As a result of the friction between the good layer and the The product is pushed upwards on the sieve surface and in this way forms a coherent cake, the extends from the end of the stroke length of the impact element to the exit end of the sieve bottom. That at the moving forward movement of the element is pressed against this cake, whereby it is compressed to a greater extent than in the known device. It is therefore essentially, the pushing element has a relatively small stroke range compared to the length of the screen surface to be given, namely a stroke length so small that the cake is as long as possible.

The advantage of the device according to the invention is that the screen length is nevertheless relatively short can be that there is a low energy consumption and that a very satisfactory drainage is achieved will.

In a preferred embodiment, the device consists

for at least partial drainage
fine-grained good

Applicant:
Stamicarbon NV, Heerlen (Netherlands)

Representative: Dr. F. Zumstein,

Dipl.-Chem. Dr. rer. nat. E. Assmann

and Dipl.-Chem. Dr. R. Koenigsberger,

Patent Attorneys, Munich 2, Bräuhausstr. 4th

Claimed priority:
The Netherlands of October 29, 1958 (No. 232 730)

Freerk Jan Fontein, Heerlen (Netherlands),
has been named as the inventor

Shock element made up of two or more with alternating Impact effect of parts acting next to one another.

Such a construction has the advantage of more regular energy consumption with less Peak load, while the material also comes off more evenly at the outlet end of the channel. because If the lines of force of the impact elements diverge in the direction of the outlet end of the channel, the discharge takes place of the goods practically over the entire width of the channel.

The device according to the invention is of particular importance in combination with an upstream shear classifier, as is described, inter alia, in the German Auslegeschrift 1037381.
In such a construction, which is generally used for separating a mixture of solid particles suspended in a liquid according to particle size or for the partial dewatering of a suspension formed from solid particles and liquid, a residue fraction is obtained which generally still contains too much moisture to be easily transported with the hooves of a conveyor belt. By downstream connection of the invention

109 750 / 8S

Device behind the shear classifier a very satisfactory drainage is achieved. Previously you needed an oscillating or vibrating sieve for this. Even in the case of the shear classifier serves as a draining sieve for a fraction from a heavy liquid such. B. magnetite, working Separation system originates, can by downstream of the device according to the invention behind the Shear classifier still a substantial part of the undiluted heavy liquid in a simple and cheap way win back. The device according to the invention can be short.

The pressing pressure that develops in the cake is mainly due to the resistance caused by the forward movement of the cake. This resistance is of the dehydrated type Good things and also from the shape and inclination of the gutter as well as from the one attached in the gutter Screen lining dependent. In many cases sufficient drainage is achieved if it is ensured that the resistance developed is relatively low, so that also that of the impact element energy to be exerted can be largely reduced.

The gutter is preferably designed to be self-discharging. To this end, the walls of the The channel diverges upwards, or the bottom of the channel becomes the outlet end at least in the last section made wider. A combination of these two measures can also be advantageous.

The resistance is also largely dependent on the slope of the channel. This gutter can tilt up or down or run horizontally. In special cases it is also curved Embodiment of the gutter possible, whereby the gutter e.g. its end is inclined upwards. The resistance and thus also the pressure applied with each stroke of the impact element is developed, decreases when the trough has a more downward slope having. Should the device be intended for the dewatering of goods of different composition it can be constructed so that the angle of inclination of the gutter is adjustable.

The invention is explained as an example using the drawing. It shows

Fig. 1 schematically shows a longitudinal section of the device according to the invention, which is under a shear classifier is set up, namely where the residue fraction is discharged, and

Fig. 2 is a vertical section of a similar device, but which now consists of two parts Has impact element, and

Figure 3 is a top plan view of this device with the shear classifier omitted.

Referring to Fig. 1, there is a shear classifier 1 with a sieve bottom 2 and a feed device set up a flat sieve for a suspension 3, the sieve bottom z. B. from in the longitudinal or Transversely arranged bars can exist, between which there are fine gaps. On the Sieve surface 4 is a push element 5 is attached, which with the help of a compressed air-controlled piston 6 and a Cylinder 7 can perform a reciprocating movement over the sieve surface 4, as indicated by an arrow is specified. A collecting container 8 with a discharge pipe 9 is located under the sieve surface. In the drawing the sieve 4 has a slight downward inclination in the direction of the discharge end, which at Dewatering of z. B. Coal is important.

The device works as follows: the residue falling from the sieve bottom 2 at 10 gets onto a sieve surface 4 and is pushed by the impact element 5 after the exit end of this surface (in of the figure to the right), with liquid and fine particles through the openings in the sieve surface fall into the collecting container 8. As a result of

ίο friction that the material experiences on the sieve bottom 4, a more or less thick cake 11 is formed, which is pushed forward only slowly. At this Cake accumulates a new layer of moist material every time the impact element 5 is lifted, see above that liquid is forced out. The stroke length is preferably small, much less than the effective length of the sieve bottom 4.

It goes without saying that when determining the length of the impact element 5 and the length of the stroke, it also increases calculate that no goods may fall behind the impact element.

The material discharged at 12 is now suitable for being removed with the aid of a conveyor belt.
The device shown in Figs. 2 and 3 differs from that in Fig. T in that the impact elements are constructed from two parts 20 α and 20 b . Each impact element is equipped with a bracket 21 on which a connecting rod 22 engages rotatably. The other end of the connecting rod 22 is rotatably connected to a crankshaft 23, which is mounted in bearings 24 mounted on sockets 25. The crankshaft 23 is also equipped with a flywheel 26, which also serves as a pulley of a drive belt for a drive system, not shown.

A device with two pushing elements is designed in such a way that one element moves forward, while the other is on its way back at the same time. At the top of this Impact elements are guides 28 which are attached to the flat screen 27.

The device also consists of a shear classifier 29 with a feed container 30, into which the material to be screened or dewatered enters at A. The classifier is further provided with a collecting space 31 for the liquid and fine particles which have fallen through the openings of the classifier. In the side wall of this collecting container 31 an opening 32 is provided which is connected to the collecting funnel 34 of the fixed flat sieve 27 via the line 33. The line 33 opens into this funnel through the opening 35. The liquid or suspension that has passed through the shear classifier 29 and the sieve bottom 36 of the flat sieve 27 is discharged through the line 37. A conveyor belt 39 is located below the exit end 38 of the sieve 27. Instead of two, several impact elements can advantageously be used next to one another. As the lines of force of each impact element diverge in the direction of the outlet end of the flat screen, the dewatered material is continuously removed. Instead of a crankshaft drive, the pushing elements can also be driven hydraulically or pneumatically. In the present example, the shear classifier has a developed length of 800 cm and consists of two adjacent parts with a width of 60 cm each. The length of the flat sieve bottom is 36 cm and the width 130 cm. The stroke length of each push element is 10 cm

Claims (5)

5 6 with a frequency of four movements in the The device according to the invention can also serve as a drainage be "oiel 1 ^s ^ ^ ⁰¹ magnetite slurry in a coal or ore P wash at minute, saromen with the shear classifier, with the one discharged at 12 then Via a channel, the bottom of which is made of a flat 5 material over a shower sieve. This sieve consists of a shower sieve parallel in the length direction, can be a vibrating sieve, can be composed of rods, will also consist of a fine classifier, but also a shear classifier, the coal, which is located between vertical plates upstream of a device according to the invention and has a moisture content of ± 35 ° / », is.
out, in the longitudinal direction of the gutter. ok Length of the sieve surface 1500 mm claims: Width of the sieve surface 300 mm. . Distance between the plates,. ¹ ^ device for at least partial development between which the good ^water fine-grained good which from a is located 300 mm ⁱ⁵ gutter with a perforated screen Spaltbreitezwdschen denStäben 0.8 mm ^Bode £ ^from a back across the floor and The height of the layer of material is 250 mm, the impact element, its stroke length Speed of the forward ^{hemer is effective as ώβ effective Lan} S ^{& the} sieve surface, movement + 8 cm / sec and consists of feed means for the feed material, ^{s δ} ao characterized in that the maximum stroke at the end of the flat sieve, the fine coal was still a long time Quarter of the length of the sieve surface.
a moisture content of 27.7%. 2. Apparatus according to claim 1, characterized ge-Die Capacity of the chute was 11.21 solids each, indicating that the stroke length is one tenth of that Hour. effective screen length or less. Example 2 ²⁵ ^ ' Device according to claim 1 or 2, because ^p is characterized in that the walls of the channel diverge upwards over a channel with the same dimensions as those and / or that the channel in example 1 was floor at least in the last section towards the moving-out impact element, as it appears in the figure, is constructed wider and / or that the residue fraction of a shear class 30 is inclined down the channel.
rers led. The fraction consisted of a mixture 4. Device for at least partial Entvon Berge und Mittelgut and had a moist, fine-grained, unbound liquid rate of 35%. Stroke length of the material containing the impact element, characterized by the 300 mm; Frequency: 15 strokes per minute. The combination of an upstream shear class moisture content of the material at the end of the flattener with the device according to claim 1 sieves was 22%. The gutter had a capacity of up to 3. of 121 solids per hour. 5. Device according to one or more of the From the examples it can be seen that in approximately claims 1 to 4, characterized in that the same capacity of the discharged dry substance, the impact element of two or more with the moisture content in example 1 with ± 7.3% and 40 alternating impact effects act side by side - in example 2 decreases by ± 13%. the parts. 1 sheet of drawings © 109 750/88 12.61