SU1284579A1 - Mass exchange apparatus - Google Patents

Abstract

The mass exchange column apparatus can be used for the simultaneous implementation of pulp classification processes, sand washing and sorption of soluble valuable substances. The purpose of the invention is to simplify the production of valuable substances by simultaneously carrying out processes for the classification of pulp, washing sand and sorption of soluble valuable substances, as well as reducing sand removal from the conical part of the upper settling chamber. A distinctive feature of the apparatus is that the cylindrical part of the upper settling chamber is provided with contact elements, a mesh conical shell and a nozzle for removing the ion exchanger, while the ratio of the cross-sectional areas of the reaction chamber and the cylindrical part of the upper settling chamber is 0.15-0.55. In addition, a package of truncated cones and a conical tube are installed in the conical part of the upper settling chamber, with which a nozzle for supplying the pulp is tangentially connected. The device can be used in the chemical industry, hydrometallurgy of rare and non-ferrous metals and other industrial fields. 1 il. with $ (L S

Description

The invention relates to the design of column apparatus and is intended for use in the chemical industry, hydrometallurgy of rare and non-ferrous metals in the implementation of countercurrent mass-exchange processes in the liquid-solid system, such as, for example, the classification of slurries with simultaneous washing of sand, the sorption of soluble substances by ion-exchange. resins, etc.

The purpose of the invention is to simplify the production of valuable substances by simultaneously carrying out processes for the classification of pulp, washing sand, sorption of soluble substances, and also preventing sand from being removed from the conical part of the upper settling chamber.

The drawing shows a mass exchange apparatus, a general view,

The mass exchange column apparatus contains an upper settling chamber consisting of cylindrical 1 and conical 2 parts, lower 3 settling and pulsation 4 chambers, reaction chamber 5, branch pipes for supplying pulp 6 and removal of sand 7, ion exchange resin) for supplying wash liquid 10 and removal of slurry slurry I. The cylindrical part of the upper settling chamber 1 and the reaction chamber 5 are provided with contact elements 12, and the conical part of the upper chamber 2 is a package of truncated cones 13 and a conical pipe 14. ilindricheska part of the upper settling chamber also is provided with a conical sidewall 15 mesh.

Mass transfer apparatus operates as follows.

Pulp containing solid particles and a valuable soluble component, such as molybdenum, is fed tangentially through pipe 6 into the conical pipe 14 of the conical part of the upper settling chamber 2. From the bottom, the washing liquid (water, acidified water, etc. .). The sands, which are repeatedly in contact with the washing liquid in the reaction chamber 5, are concentrated in the lower settling chamber 3 and are discharged through a runway, cuttings 7. The liquid phase containing the valuable component and sludges is acceptable for further processing.

five

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sa - sorption, the amount of sand, passes through a packet of straight truncated cones 13 and enters through the mesh shell 15 into the cylindrical part of the upper settling chamber 1. There, through the nozzle 8, ion exchanger is fed, which, repeatedly in contact with the slurry suspension, is retained on the mesh conical shell 15, having a size larger than the grain diameter of the ion exchanger, and taken out for regeneration through the pipe 9. The suspension that was in contact with the ion exchanger is removed from the device through the pipe 11. The volume of the pulp filling the device is The cooling chamber 4 communicates reciprocating oscillatory movements by means of a slide-distributing mechanism. Contact elements 1.2 are used to ensure efficient mass transfer of sand with wash liquid and ion exchanger with slurry slurry.

Thus, three separation zones are created: the reaction chamber, the conical part of the upper settling chamber and the cylindrical part of the upper settling chamber. In the first zone, there is a diffusion process of separating soluble matter from the pore moisture of the Peskovy particles into the stream of washing liquid, in the second -. the mechanical process of separating the solid to the 5th phase of the initial pulp into the sand and slurry fractions, and in the third - the mass transfer sorption process of the soluble substance.

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Making the apparatus such that the ratio of the cross-sectional areas of the reaction chamber and the cylindrical part of the upper settling chamber is 0.15-0.55 results in the creation of a suspended sediment layer over the entire vertical flow. With a ratio of areas of cross section less than 0.15, violation of the suspended ion exchanger occurs due to compaction and formation of channels in the cylindrical part of the upper settling chamber, which leads to deterioration of the mass transfer efficiency. When the area ratio is more than 0.55, violation of the suspended layer of ion exchanger also occurs due to its significant expansion due to the increased speed of the upward flow of the suspension. In addition, the contact time of the slurry suspension and the ion exchanger is insufficient to saturate the resin with a soluble substance. This leads to the loss of a valuable component with the solution leaving the apparatus.

The supply of the cylindrical part of the upper settling chamber with a mesh conical shell and a pipe for sludge removal prevents the resin from entering the classification zone and facilitates independent removal of the sludge from the apparatus. This creates an additional zone of the mass-exchange sorption process. The advantages of this technique, consisting in carrying out two mass-transfer and one mechanical processes in one machine, are the absence in the technological chain of pumps, airlifts, buffer tanks, valves and other stop valves, reduction of production space and energy consumption, creating a single layer with a single pulsator. for the process of classification of the pulp with simultaneous washing of the sands, and for the process of sorption.

The conical part of the upper settling chamber, in which the classification takes place, i.e. separation of the solid phase of the original pulp on

The leached pulp has a follow-up and slurry fraction. And from the characteristics: the content of molybne, how much the separation in the liquid phase is 4.3-4.5 g / l; density, depends on how the quality of the bottom product - sand, which should contain the minimum number of small classes - sludge and the quality of the upper drain 40, which should contain the minimum number of major classes for the subsequent process - sands. This is facilitated by the installation in the conical part 45 of the upper settling chamber of a package of truncated cones and a conical pipe, with which a pipe for feeding the pulp is tangentially connected. Efficient use of a conical tube enters water in the ca- mometer Flow rate as a cyclone chamber for the provision of 4.9-5.1 l / min. Sands, many times additional classification of the solid phase of the pulp due to the creation of a centrifugal field. The proposed shape of the pipe is also due to the need to create increased resistance in the lower part of the conical pipe, which prevents a large number of pshams from falling into the reno 1420-1490 kg / m; sand content class +0.1 mm 39-42%.

The experimental procedure is as follows.

The initial leached pulp with a flow rate of 4.8-5.0 l / min is tangentially fed into the conical tube of the conical part of the upper settling chamber, which mainly separates the solid phase of the pulp into the sand part (particles larger than 0.1 mm) and slurry (particle size less than 0.1 mm) fraction. Down through

in contact with water, they are thickened and removed from the lower settling chamber of the apparatus. The spam suspension, passing through a packet of truncated cones, enters the cylindrical part of the upper settling chamber, into which the ion exchanger is fed from the top at a rate of 0.9-1.0 l / min. Pillar of pulp in appa

Promotional chamber 5. The package of truncated cones 13 serves the same purpose.

Thus, the supply of the cylindrical part of the upper settling chamber with contact elements, a mesh conical shell, a pipe for draining the sludge and making the apparatus such that the ratio of the cross-sectional areas of the reaction chamber and the cylindrical part of the upper settling chamber is 0.15-0.55 in the conical part of the upper settling chamber of the truncated cones package and the conical pipe, with which the pipe for supplying the original pulp is tangentially connected, provide the possibility of simultaneous classifications of pulp classification, washing of sands and sorption of soluble valuable substances in a single apparatus with the production of wash sands, all-ion exchange and drainage containing sludge fractions.

Example 1. In a column apparatus having a diameter of the reaction chamber of 0.2 m and a height of 2.2 m, a diameter of the cylindrical part of the upper settling chamber is 0.3 m and a height of 3.2 m (the height of the conical part of the upper settling chamber is 1.3 m) , classification of leached pulp, washing of sand and sorption of molybdenum by ion exchanger are carried out. .

The leached pulp has the following characteristics: the molybdenum content in the liquid phase is 4.3–4.5 g / l; the density flow meter is water. Water consumption 4.9-5.1 l / min. Sands, many times

 characteristics: the molybdenum content in the liquid phase is 4.3–4.5 g / l; the flow meter enters the water. Water consumption 4.9-5.1 l / min. Sands, many times

ness 1420-1490 kg / m; sand content class +0.1 mm 39-42%.

The experimental procedure is as follows.

The initial leached pulp with a flow rate of 4.8-5.0 l / min is tangentially fed into the conical tube of the conical part of the upper settling chamber, which mainly separates the solid phase of the pulp into the sand part (particles larger than 0.1 mm) and slurry (particle size less than 0.1 mm) fraction. Down through

 characteristics: the molybdenum content in the liquid phase is 4.3–4.5 g / l; the flow meter enters the water. Water consumption 4.9-5.1 l / min. Sands, many times

in contact with water, they are thickened and removed from the lower settling chamber of the apparatus. The spam suspension, which passes through a packet of truncated cones, enters the cylindrical part of the upper settling chamber, into which the ion exchanger is fed from above at a flow rate of 0.9-1.0 l / min. A pulp column in the apparatus is reciprocated through a pulsation chamber and oscillating movements are carried out. The speed of the upward flow of water in the reaction chamber is 9.7 m / h, the speed of the upward flow of the slurry slurry in the cylindrical part of the upper settling chamber, 8.5 m / h.

The results of the experiments are presented in table.1.

Table 1

As can be seen from the results of the experiments, high efficiency of mass transfer processes and classification of the solid phase of the initial alkalized pulp is achieved. The resulting lower and upper products of the proposed mass transfer column apparatus contain the minimum amount of dissolved molybdenum, the top drain - the minimum amount of sand.

Example 2. In the column apparatus having the diameter of the reaction

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cameras 0.2 m and the diameter of the cylindrical part of the upper settling chamber, respectively, 0,22; 0.24; 0.27; 0.30; 0.40; 0.44; o, 51; o, 60; oh, 70m and. made in accordance with the proposed design, produced

 classification of leached pulp, sand washing and molybdenum sorption by ion exchanger (test condition No. 1). As a result of testing, the following technological parameters are obtained.

35 (table 2).,,

table 2

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The results of the tests showed that in order to achieve this goal, it is necessary to perform a column apparatus in which the cross section of the reaction chamber is (0.15-0.55) of the cross section of the cylindrical part of the upper settling chamber. If this ratio is less, the loss of the valuable component due to channeling in the ion exchanger layer increases by three or more times, and if the area ratio is more than 0.55, the loss of the valuable component (molybdenum) also increases due to disturbance of the suspended layer (an upward flow rate that exceeds equal to or slightly less than the experimentally determined deposition rate of the ion exchanger in the slurry suspension, which leads to a strong displacement of the suspended layer and in some cases to the partial removal of the ion exchanger) and insufficient contact time a nion exchange resin with a solution.

The proposed apparatus is characterized by significant technical and economic efficiency and can be used to simplify the conduct of mass-exchange processes. Carrying out the processes of pulp classification and sand washing in a single apparatus, sorption of the valuable soluble substance with ionite simplifies the technological scheme for obtaining a valuable component since I exclude from the chain of apparatuses

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Additional pumps, air lifters, buffer tanks, valves, valves, instrumentation and automatic machines, etc.

Claims (2)

1. A mass transfer apparatus of continuous action with countercurrent phases and suspended sediment, including an upper, lower settling and a pulsation chamber, a reaction chamber with contact elements, branch pipes for inlet and outlet of phases, characterized in that in order to simplify the production of valuable substances by simultaneous implementation of the processes of pulp classification, sand washing and sorption of soluble substances, the cylindrical part of the upper settling chamber is equipped with contact elements, a mesh conical shell and a nozzle for water sludge, wherein the ratio of the sectional area of the reaction chamber and the upper cylindrical portion of the settling chamber is equal to 0,15-0,55. 2. A mass transfer apparatus according to claim 1, characterized in that, in order to prevent sand from being carried out from the conical part of the upper settling chamber, the settling chamber is provided with a package of truncated cones and a conical set installed therein. a pipe with which a phase supply pipe is tangentially connected.