Enhanced thickening mechanism for counter-current decantation (CCD)

Abstract

The present application discloses an enhanced thickening mechanism for counter-current decantation (CCD), comprising a cylinder and a stirring mechanism. The upper part of the cylinder is provided with a flocculant adding pipe, the top of the cylinder is open for a supernatant to overflow into the cylinder, and a through hole is formed in the middle of the cylinder for a turbid liquid to enter the cylinder through the through hole. The stirring mechanism is arranged inside the cylinder and is used for stirring the liquid in the cylinder, and a stirring end of the stirring mechanism is arranged at the lower middle part of the cylinder. In the enhanced thickening mechanism for CCD provided by the present application, the supernatant overflows into the cylinder, the turbid liquid enters the cylinder through the through hole in the middle of the cylinder, and a flocculant is added into the cylinder; and mixed flocculation of the supernatant, the turbid liquid and the flocculant is realized under the action of stirring, thereby improving the flocculation settling effect, and reducing the turbidity degree of the output supernatant.

Description

A CCD countercurrent washing reinforced thickening mechanism TECHNICAL FIELD

[0001] The present application relates to the technical field of CCD countercurrent washing, in particular to a CCD countercurrent washing reinforced thickening mechanism. BACKGROUND

[0002] The CCD countercurrent washing in the hydrometallurgy of laterite nickel ore is a commonly used solid-liquid separation technology. This technology uses the difference in specific gravity of solid phase in the solid-liquid separation process and the impact force of washing liquid on the material to separate the solid phase and the liquid phase, so as to improve the washing efficiency and recovery rate.

[0003] In the existing CCD countercurrent washing process of hydrometallurgy of laterite nickel ore, the flocculation thickening effect of the first-stage countercurrent washing thickener is poor, mainly because the temperature of the ore pulp in the first-stage countercurrent washing thickener is relatively high, which causes the water molecules to move violently, and in turn drives the leaching slag particles to diffuse into the supernatant, resulting in turbidity of the supernatant and affecting the flocculation and sedimentation effect.

[0004] SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and provide a CCD countercurrent washing reinforced thickening mechanism to solve the technical problem that the leaching slag particles diffuse into the supernatant due to the high temperature of the ore pulp in the thickener, making the supernatant turbid and affecting the flocculation and sedimentation effect.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] The present application provides a CCD countercurrent washing reinforced thickening mechanism, comprising:

[0008] a cylinder, an upper part of the cylinder is provided with a flocculant adding pipeline, and a top of the cylinder is open for the overflow of the supernatant into the cylinder, a middle part of the cylinder is provided with a through hole for the turbid liquid to enter the cylinder through the through hole; and

[0009] a stirring mechanism arranged inside the cylinder for stirring the liquid in the cylinder, a stirring end of the stirring mechanism is arranged at a middle lower part of the cylinder.

[0010] In some embodiments, the stirring mechanism comprises a motor, a stirring shaft and a stirring impeller, the stirring shaft is connected with a driving shaft of the motor and located on a central axis of the cylinder, and the stirring impeller is installed on the stirring shaft and located at the middle lower part of the cylinder.

[0011] In some embodiments, the cylinder is in an upper-lower horn shape with the stirring end of the stirring mechanism as a dividing line.

[0012] In some embodiments, the upper portion of the cylinder is provided with holes for the supernatant to flow in.

[0013] In some embodiments, the holes are multiple, and the multiple holes are arranged in multiple layers in the circumferential direction from top to bottom.

[0014] In some embodiments, the number of through holes is at least one.

[0015] In some embodiments, the upper portion of the cylinder is further provided with a dilution liquid pipeline for guiding the overflow supernatant in the next stage of the counter-current washing thickener into the cylinder.

[0016] In some embodiments, the end of the dilution liquid pipeline is provided with multiple branch pipes, and the multiple branch pipes are arranged in the circumferential direction at the upper portion of the cylinder.

[0017] In some embodiments, the number of flocculant adding pipelines is multiple, and the multiple flocculant adding pipelines are arranged in the circumferential direction at the upper portion of the cylinder.

[0018] In some embodiments, a distributor is arranged below the cylinder, the distributor is conical umbrella-shaped, and the lower edge of the distributor has a gap with the bottom of the cylinder.

[0019] Compared with the prior art, the CCD counter-current washing reinforced thickener provided by the application can realize the mixing and flocculation of the supernatant, turbid liquid and flocculant under the stirring action by the overflow of the supernatant into the cylinder, the turbid liquid entering the cylinder through the through hole in the middle of the cylinder, and the addition of the flocculant in the cylinder, so that the turbid liquid in the middle can be treated, the flocculation and sedimentation effect is improved, and the turbidity of the output supernatant is lower. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a structural schematic view of the CCD counter-current washing reinforced thickener provided by an embodiment of the application;

[0021] FIG. 2 is a structural schematic view of the CCD counter-current washing reinforced thickener provided by an embodiment of the application;

[0022] FIG. 3 is a structural schematic view of the CCD counter-current washing reinforced thickener provided by another embodiment of the application;

[0023] FIG. 4 is a three-dimensional view of a straight cylinder provided by an embodiment of the application;

[0024] FIG. 5 is a three-dimensional view of an upper and lower horn-shaped cylinder provided by another embodiment of the application.

[0025] Explanation of reference signs:

[0026] 1, cylinder; 101, flocculant adding pipeline; 102, through hole; 103, hole; 104, dilution liquid pipeline; 1041, branch pipe;

[0027] 2, stirring mechanism; 21, motor; 22, stirring shaft; 23, stirring impeller;

[0028] 3, distributor; 4, liquid level; 5, supernatant layer; 6, turbid liquid layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0030] In order to solve the technical problem that the particles of leaching residue diffuse into the supernatant due to the high temperature of the ore slurry in the thickener, which makes the supernatant turbid and affects the flocculation and sedimentation effect, the present application provides a CCD countercurrent washing reinforced thickener, which can realize the mixed flocculation of the supernatant, turbid liquid and flocculant, improve the flocculation effect, reduce the turbidity of the supernatant that may be generated, and make the output supernatant have lower turbidity.

[0031] It should be noted that the CCD countercurrent washing reinforced thickener described in the present application is used in but not limited to the first stage countercurrent washing thickener. In order to facilitate the description, in the present application, only the CCD countercurrent washing reinforced thickener applied to the first stage countercurrent washing thickener is taken as an example for description, and the principle of the CCD countercurrent washing reinforced thickener applied to other types of equipment is substantially the same as that applied to the first stage countercurrent washing thickener, which is not described here.

[0032] Please refer to Fig. 1, which is a structural diagram of the intensified thickening mechanism for CCD countercurrent washing in an embodiment of the present application. The intensified thickening mechanism for CCD countercurrent washing comprises a cylinder 1 and a stirring mechanism 2. The upper part of the cylinder 1 is provided with a flocculant adding pipeline 101 for adding flocculant. The top of the cylinder 1 is open, corresponding to the supernatant layer 5, for the overflow of supernatant into the cylinder 1. The middle part of the cylinder 1 is provided with a through hole 102, corresponding to the turbid liquid layer 6, for the turbid liquid to enter the cylinder 1 through the through hole 102. In the cylinder 1, the overflowed supernatant has a certain cooling effect on the ore slurry. Under the connection of the through hole 102, the generated turbid liquid enters the cylinder 1. In the cylinder 1, the flocculant, supernatant and turbid liquid are mixed, so that the turbid liquid can be flocculated again by the flocculant, the turbidity of the supernatant is reduced, and the turbidity of the output supernatant is lower. The stirring mechanism 2 is arranged inside the cylinder 1 for stirring the liquid in the cylinder 1. The stirring end of the stirring mechanism 2 is arranged at the middle and lower part of the cylinder 1 for rotating and stirring in the cylinder 1, promoting the mixing of the supernatant, turbid liquid and flocculant, so as to form a better flocculation effect.

[0033] It can be understood that in the CCD countercurrent washing process, the temperature of the ore slurry transported in the first stage countercurrent washing is the highest, and the supernatant turbidity is most likely to occur, so the intensified thickening mechanism is mainly used in the thickener of the first stage countercurrent washing and is installed in the thickener.

[0034] In one embodiment, please refer to Fig. 1, the stirring mechanism 2 comprises a motor 21, a stirring shaft 22 and a stirring impeller 23. The stirring shaft 22 is connected with the driving shaft of the motor 21 and is located on the central axis of the cylinder 1. The stirring impeller 23 is installed on the stirring shaft 22 and is located at the middle and lower part of the cylinder 1. The motor 21 drives the stirring shaft 22 to rotate, and the stirring shaft 22 drives the stirring impeller 23 to rotate, so as to realize the mixing and flocculation of the supernatant, turbid liquid and flocculant under the stirring action of the impeller.

[0035] It can be understood that the stirring mechanism 2 can be the stirring part of the thickener itself, i.e. the rotating driving part of the rake frame. The stirring impeller 23 is installed on the shaft body of the rotating driving part, i.e. the stirring shaft 22, and rotates synchronously with the rotation of the rake frame to mix the supernatant, turbid liquid and flocculant in the cylinder 1.

[0036] In one embodiment, please refer to Figs. 3 and 5, the cylinder 1 is trumpet-shaped above and below the stirring end of the stirring mechanism 2. The upper trumpet promotes the supernatant to gather to the middle center, and the lower trumpet promotes the mixed and flocculated liquid to spread to the outer periphery, playing a role of concentrated mixing and flocculation and then uniform distribution.

[0037] In one embodiment, referring to Figures 2 and 4, the upper part of the cylinder 1 is provided with a plurality of holes 103 for the inflow of supernatant. When the liquid level of the supernatant cannot achieve the overflow effect, the supernatant can flow into the cylinder 1 from the holes 103, ensuring the flocculation effect, and the flow of the supernatant entering the cylinder 1 through the holes 103 is slowed down, avoiding too much supernatant entering the cylinder 1 and affecting the final flocculation effect.

[0038] Further, the plurality of holes 103 are arranged in multiple layers in a circumferential direction from top to bottom, so that the supernatant can enter the cylinder 1 uniformly.

[0039] In one embodiment, referring to Figures 1 and 2, the number of through holes 102 is at least one, which is used to communicate the turbid liquid outside with the inside of the cylinder 1, so as to flow into the cylinder 1.

[0040] Further, the number of through holes 102 is four, which are arranged in a circumferential direction on the outer periphery of the cylinder 1.

[0041] In one embodiment, referring to Figure 1, the upper part of the cylinder 1 is further provided with a dilution liquid pipeline 104, which is used to guide the overflow supernatant in the next stage of the counter-current washing thickener into the cylinder 1, so as to further cool and dilute.

[0042] Further, the end of the dilution liquid pipeline 104 is provided with a plurality of branch pipes 1041, which are arranged in a circumferential direction on the upper part of the cylinder 1, so as to distribute the overflow supernatant from the next stage of the counter-current washing thickener evenly.

[0043] In one embodiment, referring to Figure 1, the number of flocculant adding pipelines 101 is a plurality, which are arranged in a circumferential direction on the upper part of the cylinder 1, so as to distribute the flocculant evenly in the cylinder 1.

[0044] In one embodiment, referring to Figure 1, the lower part of the cylinder 1 is provided with a distributor 3, which is in the shape of a conical umbrella, and the lower edge of the distributor 3 has a gap with the bottom of the cylinder 1. The distributor 3 is used to distribute the material evenly, ensuring the effectiveness and consistency of the subsequent processing process, and can distribute the ore pulp evenly into the thickener, ensuring the uniformity and efficiency of the washing or thickening process.

[0045] In order to better understand the present application, the technical solutions of the present application will be described in detail in combination with Figures 1 to 5:

[0046] The supernatant enters the cylinder 1 by overflowing or passing through the holes 103; the turbid liquid enters the cylinder 1 through the through holes 102; the flocculant is injected into the cylinder 1 through the flocculant adding pipe 101; the overflow supernatant in the next stage of the counter-current washing thickener is introduced into the cylinder 1 through the dilution liquid pipe 104; under the driving of the stirring mechanism 2, the stirring impeller 23 stirs and mixes the supernatant, the overflow supernatant in the next stage of the counter-current washing thickener, the turbid liquid and the flocculant, promotes flocculation, and makes the output supernatant have a lower turbidity.

[0047] The specific implementation of the application described above does not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application should be included in the protection scope of the claims of the application.

Claims

1. A reinforced thickener for counter current washing of a CCD, installed in a thickener, characterized in that, The application relates to a thickener, which comprises: a cylinder, the upper part of which is provided with a flocculant adding pipe, the top of which is open for overflow of supernatant into the cylinder, and the middle part of which is provided with a through hole for turbid liquid to enter the cylinder; and a stirring mechanism arranged inside the cylinder for stirring liquid in the cylinder, the stirring end of the stirring mechanism being arranged at the middle and lower part of the cylinder.

2. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The stirring mechanism comprises a motor, a stirring shaft and a stirring impeller, the stirring shaft being connected with the driving shaft of the motor and being located on the central axis of the cylinder, and the stirring impeller being installed on the stirring shaft and being located at the middle and lower part of the cylinder.

3. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The cylinder is trumpet-shaped above and below the stirring end of the stirring mechanism.

4. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The upper part of the cylinder is provided with holes for supernatant to flow in.

5. The intensified thickener for countercurrent washing of a CCD according to claim 4, characterized by The holes are multiple, and the multiple holes are arranged in multiple layers in the circumferences from top to bottom.

6. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The through hole is at least one.

7. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The upper part of the cylinder is further provided with a dilution liquid pipe for guiding overflow supernatant in a next stage of countercurrent washing thickener into the cylinder.

8. The intensified thickener for countercurrent washing of a CCD according to claim 7, characterized by The end of the dilution liquid pipe is provided with multiple branch pipes, and the multiple branch pipes are arranged in the circumferences of the upper part of the cylinder.

9. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by The flocculant adding pipe is multiple, and the multiple flocculant adding pipes are arranged in the circumferences of the upper part of the cylinder.

10. The intensified thickener for countercurrent washing of CCD according to claim 1, characterized by A distributor is arranged below the cylinder, the distributor is conical umbrella-shaped, and there is a gap between the lower edge of the distributor and the bottom of the cylinder.

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