JPS62502735A - Fluid classification method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Fluid classification method and device The present invention provides a method in which particulate material carried by a liquid is transported through a cylindrical, substantially vertical classification cavity. In a centrifugal force field established between A fine grain product composed of light particles and a fine grain product that is likely to be separated at the outer edge of the centrifugal force field. The relative flow descends to the lower end of the classification space as a winding flow following the edge of the field. (2) A method for classifying fluids into coarse particles consisting of coarse particles.

The most common equipment used for fluid classification of granular materials is usually a cylindrical top It is a hydrocyclone consisting of a lower part and a conical lower part. The hydrocycle Ron separates the material to be classified with the fine product transferred through one pane of the cyclone. , from the lower end of the cyclone, i.e. through the opening at the tip of the lower conical part. Coarse grain products to be transferred. Partially conical hydrocyclone In addition, a cyclone with a flat bottom can separate fine and coarse products. Also used are those in which separation and their discharge occur in a substantially similar manner.

and also that the coarse product is tangentially transported with the aid of passages starting at the periphery or bottom of the device. There are also known classification devices that can be moved in the opposite direction.

The classification carried out with the said equipment of the prior art ideally results in a fine product at the end. However, finely ground substances contained in the material being classified are also present in the material. is hampered by the disadvantage that coarse product is transferred by the liquid classification fluid. . The finely divided material is transferred in at least equal proportions as the classified fluid is transferred. In other words, the more such material is transferred with the coarse product, the more The more that is transferred, the greater the ratio of coarse to fine product. the previous amount form part of a wet milling process where the ratio is optimally between about 100 and 300%. The separation precision of the classification carried out by conventional equipment, i.e. to produce fine-grained products, is The proportion of particles smaller than a specified size limit in the material being classified that are successfully separated. The rate is typically no more than about 50%, and sometimes it is even lower than 40%. .

The most commonly used hydrocyclones do not have such limitations between operations. Another drawback is that it is almost impossible to adjust the field size. cyclo Other than adjusting the dimensions of the coarse product transfer opening at the lower end of the The adjustment method is also largely unknown.

Even this is rarely used due to practical difficulties.

The object of the invention is to eliminate the aforementioned drawbacks of the current state of the art and thereby Better separation accuracy and classification process than before! 11611 Possible Fluid Minutes The goal is to devise a method for determining the grade level. The method of the present invention is characterized by a ring formed at the lower end of the classification space. is guided tangentially to the field of centrifugal force through a gap of Using a separate tangential liquid flow as an auxiliary means, the coarse product is It is characterized by being transferred from the field of mental power.

By using a pure liquid flow directed tangentially to the centrifugal field, Depending on the grain product, fewer, if any, grains below the fine grain threshold size than conventional The effect of entraining finely divided particles with size 1q. liquid During the flow, the liquid fluid supplied to the classification process along with the material to be classified is divided into coarse particles. It is arranged so that everything goes out with the fines, without any participation in the transfer of the product. can be adjusted. It is even possible to further increase the liquid flow, and Therefore, it is used to adjust the critical size between fine and coarse products. obtain. When required, the centrifugal force field can be enhanced by the liquid flow. , whereby said coarse grain product has a critical size between fine grain product and coarse grain product. Even when the noise is small, the separation can be achieved with a sufficient ratio.

According to the configuration of the invention, a secondary classification stage is generated in the area of said annular gap and its operation of said discrete liquid stream fed tangentially to said centrifugal force field. A coarse product in the gap whose velocity and direction are forced by the centrifugal field. It is based on the fact that we determine the particle size whose transfer is possible as Ru. At this stage, the coarse product is divided into primary fractions generated within the main body of the classification space. Since we have not yet left the class stage in terms of RP, the secondary classification Particles finer than the size return to the classification space and are coarsely divided by this path. Affects the separation limit to combine with fine grained products. Chishi coarse grain product is contact with said separate liquid stream transferring it only after it has left the classification space body. If touched, the result would be only a dilution of the coarse product stream. Dew.

An embodiment of the invention provides that the coarse product is separated from the separate liquid in a hydrocyclone. The liquid is separated from the flow and then returned to the classification process where the centrifugal force field generates the liquid. It is characterized by moving as a fluid medium during classification. Therefore, traditional high When compared to drocyclone separation, the liquid balance remains unchanged during classification. You can get a good profit. This reflects the solid material content of the sludge they produce. For wet grinding of solid materials, where the equipment is usually severely limited for subsequent processing steps. This is particularly important.

The invention also relates to an apparatus for fluid classification of particulate material according to the method described above. The device is , as an element known per se, is a cylindrical, substantially vertical classification space; The materials and fluids to be classified, within which a centrifugal field can be established, g1. quality a feed passage that supplies liquid into the classification space, and a center of the classification space; A fine grain product consisting of relatively light particles separated into parts and the outer edge of said classification space. The fin separates into parts and flows into the lower part of the classification space in the form of a roughly swirling downward flow. It has a transfer opening for transferring coarse product consisting of relatively heavy particles.

This device consists of an annular gap in which the coarse product transfer opening is located at the lower end of the classification space. and that a passage in the tangential direction to the centrifugal force in the gap is connected to the device. connection and therefore, in the transfer of coarse products, it is possible to characterized in that a liquid flow moving tangentially with respect to the gap is used. shall be.

The invention will be explained in detail below by way of example with reference to the accompanying drawings. be done. In the drawings, FIG. 1 shows a fluid classifier according to the invention, and FIG. The figure shows a cylindrical classification chamber belonging to the apparatus of FIG. 1 according to the cross section shown in FIG. 1. FIG. 3 shows a portion of the classification space of an apparatus according to another embodiment of the present invention. part, and FIG. 4 shows the classifier of the invention choreographed as a component in a comminution circuit.

Figures 1 and 2 show particles of various sizes carried by a liquid such as water. The granular material is divided into fine-grained products consisting of relatively light particles and relatively heavy particles. A fluid classifier is illustrated for classifying coarse products consisting of:

This classification is carried out by tangential feeding of the material to be classified and the liquid acting as the fluid medium. In the field of centrifugal force generated in the vertical 6-cylindrical classification space 1, the centrifugal force The field positions the fine product in the center of the classification space and the coarse product is classified so that it is located at its outer edge. The first two materials to be classified and the fluid is caused to spirally move within the classification space 1, and this movement causes the center of the space to to lift the fine product to the transfer opening 2 located near the upper end of the space; At the outer edge, the coarse grain product is moved to the lower part of the space by the action of gravity. Press it to the coarse grain product transfer opening 3.

The apparatus shown in FIGS. 1 and 2 includes, as an essential element, the side of the cylindrical classification space 1. a feed passage 4 for the material to be classified and the fluid medium, the feed passage 4 for the material to be classified and the fluid medium; tangentially connected to the upper end of the gap, for fine grain products and the fluid that guides them a passage 5 starting from the transfer frontage, a circle located at the lower end of the classification space; a shaped closing plate 6 which connects the coarse product transfer opening to the plate and the cylindrical wall of the classification space; an annular gap 3 between the With the aid of a moving separate liquid stream, the coarse product passing through said gap is transferred. For this purpose, horizontal passages 7a and 7b are provided which are tangentially connected to the lower end of the classification space.

The liquid flow coming through the passage 7a enters the annular gap 3 through the opening 9a. directly below into the lower end of said classification space, where it is fed into the lower end of said classification space. the swirling motion that follows the outer edge and is higher and higher within the main body of the classification space 1; and is given a spiral motion directly continuous with the frontage 9b, which is Leave into the passageway 7b. Said passageway 7a is indicated with reference numeral 8 in FIG. A control valve is provided. The liquid stream leaving by said passage 7b halves the coarse product. conveyed to hydrocyclone 19, where the coarse product is separated and and the liquid passes through one of the cyclones. Proceed to the vertical transfer passage 12 starting within the end.

In FIG. 3, the lower part 13 of the cylindrical classification space 1 is enlarged, and said space a conical border 15 between said wider lower part and the narrower part 14 above it; 1 in that the movable closure member 16 is arranged in the vertical direction of the shape. An example of a different classification device is illustrated. The closing member 16 and the classification space 1 In this embodiment, the dimensions of the annular coarse product transfer opening 3 between the It can be adjusted by positioning the members.

In the disclosed classification device of the present invention, the classification space 1 is guided in a tangential direction. coarse raw material through said passage 7 with the aid of a liquid flow which does not take part in the classification process. The transfer of products is such that any finely ground material belonging to the fine-grained product is transferred to said coarse-grained product. It is imperative that they are not allowed to be accompanied by objects. The liquid flow is can be regulated by a control valve 8 located in the flow path, and the flow can be regulated by, for example, Responsible only for the transfer of the coarse product, whereby it is transferred together with the material to be classified. The liquid entering into the classification space 1 leaves completely together with the fine product and therefore It is ensured that there is no flow of fluid medium in any direction in the grain product transfer opening 3. can be adjusted to Further, the flow introduced into the classification space 1 through the passage 7 is It is also possible to adjust the flow to be greater than the flow leaving with the coarse product. , in which case a portion of said liquid advances together with the fine product. such adjustment The critical size of fine and coarse products can be increased or decreased by It is possible.

Figure 4 shows a classification space 1 and a separation space, both of which can be as shown in Figure 1. A solid material comminution circuit having a cyclone 10 is disclosed. not pre-processed (reference number 17). The coarse product (reference number 11) separated by cyclone 10 is used to separate other parts. The material to be constituted is ground in the grinding iia, and after grinding, the material is mixed together with water obtained from clone 10, and it is pumped with the help of pump 19 Therefore, it is supplied tangentially to the centrifugal force field within the classification space 1. Separated by classification The separated fines product leaves the process, while the water leaving at the same time is introduced through passage 7. is replaced by a water stream which carries the coarse product to the separation cyclone 10, As mentioned above, after that, the fluid medium is Return to work as a pawn.

The solid material content of each particular stream is entered in number 40 as a percentage. .

Various different embodiments of the invention are not limited to the examples disclosed above and Rather, it is clear to a person skilled in the art that it can be modified within the scope of the following claims. be.

Procedural amendment (6 shots) January 20th, 1986

Claims (6)

[Claims] 1. The granular material carried by the liquid passes through a cylindrical, substantially vertical classification space ( 1) In the field of centrifugal force established in A fine grain product consisting of relatively light particles and a fine grain product separated at the outer edge of the centrifugal force field. and a comparison that descends to the lower end of the classified space as a spiral flow following the edge of the field. In the fluid classification method, the former is classified into coarse products consisting of heavy particles. The centrifugal force is released through the annular gap (3) formed at the lower end of the classification space (1). a separate liquid directed tangentially to the field and moving tangentially to the gap; Using body flow as an auxiliary means, the coarse product is transferred from the centrifugal field. A fluid classification method characterized by: 2. The method according to claim 1, wherein the coarse product is hydrocycled. is separated from the liquid stream in the tube (10), after which the liquid is subjected to the centrifugal force. to be returned to the classification process to act as a liquid medium in the classification that occurs in situ. Characteristic fluid classification method. 3. Classifying granular material by the method described in claim 1 or 2 a cylindrical, substantially vertical device within which a centrifugal field can be established; The material to be classified and the liquid acting as a fluid medium are placed in the classification space (1). a supply passageway (4) for leading into the classification space, and a supply passageway (4) located in the center of the classification space A fine grain product consisting of relatively light particles to be separated and the outer edge of the classification space The relatively separating and further separating in the lower part of said classification space in the form of a swirling downward flow with transfer openings (2, 3) for transferring coarse product consisting of heavy particles in which the coarse product transfer opening (3) is located at the lower end of the classification space (1). consisting of an annular gap and a passage (7) tangential to said centrifugal force field; connection with said device in the gap, so that in the transfer of coarse product, said passage a separate liquid stream directed through the channel and moving tangentially to said gap; Apparatus for classifying granular materials, characterized in that it can be used. 4. 4. The device according to claim 3, wherein said gap (3) is a cylindrical section. A substantially circular closing member (6, 16) is provided at the lower end of the class space (1) so that said gap created by arranging the classification space so as to be defined between the wall of the classification space and the closing member. A device for classifying granular materials. 5. The apparatus according to claim 4, wherein the lower end (13) of the classification space (1) is expanded and said closing member (16) is adapted to the dimensions of said annular gap (13). vertically movable so that the angle can be adjusted by moving said closure member; An apparatus for classifying granular materials, characterized in that: 6. In the device according to any one of claims 3 to 5, The channel (7) for transferring said coarse product separates said coarse product from the liquid stream. being connected to a hydrocyclone (10), and that the hydrocyclone is The supply passage ( 4), and as a result, the liquid is classified by the centrifugal force. granular material, characterized in that it can be returned to the classification process to act as a fluid medium. A device that classifies materials.