Acid leaching treatment device for copper-cadmium slag

Abstract

The utility model relates to the technical field of zinc hydrometallurgy, and discloses a copper-cadmium slag acid leaching treatment device. A first rotating shaft and a second rotating shaft are arranged to drive a first stirring blade and a second stirring blade to rotate respectively, so that a solution and the copper-cadmium slag in the stirring tank are fully stirred, the sulfuric acid solution and the copper-cadmium slag can be in rapid contact, and the pickling speed is increased. A first bevel gear is meshed with a second bevel gear, so that a rotating motor can drive a first rotating shaft and a second rotating shaft to rotate at the same time, on the other hand, second stirring blades can upwards drive a solution to flow in the overturning process, and then particles blocked in a filter plate can be blown out; the continuous work of the filter plate is ensured. And the bottom of the pickling tank is arranged to be V-shaped, a filter plate is arranged, the filter plate can prevent large-particle-size copper-cadmium slag from entering the discharging pump, damage caused by the large-particle-size copper-cadmium slag to follow-up parts is avoided, and the bottom of the pickling tank is arranged to be V-shaped, so that the phenomenon that the slag is accumulated at the bottom of the pickling tank can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of hydrometallurgical zinc smelting, and in particular to a copper-cadmium slag acid leaching treatment device. Background Art

[0002] In the hydrometallurgical zinc industry, the supernatant leachate must be deeply purified before entering the process of preparing basic zinc carbonate to remove various impurities within a reasonable range, mainly metal impurities such as copper, cadmium, cobalt, and nickel. The main method of purification is to add excessive zinc powder for replacement, thus producing a large amount of copper-cadmium slag. The main components of copper slag are copper, zinc, cadmium and some non-metallic components. Copper-cadmium slag needs to be recycled by pickling.

[0003] In the prior art, the bottom of the copper-cadmium slag acid leaching reaction tank is flat, and the bottom discharge port is at a certain height from the bottom. The stirring reaction of the acid leaching reaction tank during the leaching stirring process is not thorough, and the stored material at the bottom of the reaction tank is not completely discharged after the leaching is completed. There is always a certain amount of incompletely leached material stored at the bottom of the reaction tank, resulting in an unsatisfactory leaching effect, which directly affects the comprehensive recovery efficiency of copper, zinc and cadmium in the copper-cadmium slag, causing waste of resources, increased production costs and other problems. Utility Model Content

[0004] In view of the above problems, an embodiment of the present application provides a copper-cadmium slag acid leaching treatment device, which can facilitate the copper-cadmium slag in the pickling tank to quickly participate in the reaction, while avoiding the problem of incompletely leached copper-cadmium slag being deposited at the bottom of the pickling tank.

[0005] According to one aspect of an embodiment of the present application, a copper-cadmium slag acid leaching treatment device is provided. The copper-cadmium slag acid leaching treatment device includes a pickling tank, the pickling tank is provided with a feeding component, the bottom of the pickling tank shrinks inward to form a feeding pipe, the bottom end of the feeding pipe is connected to a discharging pump, a support frame is provided at the bottom of the inner cavity of the pickling tank, a first rotating shaft is rotatably provided on the support frame, the other end of the first rotating shaft penetrates upward to the top of the pickling tank and is connected to a rotating motor, a plurality of first stirring blades are connected at an angle to the outer circumference of the first rotating shaft, a filter plate is provided in the pickling tank, the first rotating shaft penetrates the filter plate, a first bevel gear is connected to the bottom end of the first rotating shaft, at least two second bevel gears are connected to the first bevel gear, a second rotating shaft is connected to the central axis of the second bevel gear, the other end of the second rotating shaft is rotatably connected to the inner wall of the pickling tank, and a second stirring blade is connected to the second rotating shaft.

[0006] In some embodiments, the feeding component includes a feeding cylinder and a sulfuric acid storage tank, the top of the feeding cylinder is an open funnel shape, the bottom of the feeding cylinder is connected to the pickling tank, and the sulfuric acid storage tank is connected to the pickling tank through a sulfuric acid pump and a pipeline.

[0007] In some embodiments, a heating coil is spirally arranged in the inner cavity of the pickling tank, and the heating coil is arranged close to the inner wall of the pickling tank. The two ends of the heating coil respectively form a heat source input end and a heat source output end, and the heat source input end and the heat source output end both extend to the outside of the pickling tank.

[0008] In some embodiments, a support assembly is connected to the bottom of the pickling tank.

[0009] In some embodiments, a cleaning window is provided on the side wall of the pickling tank, a sealing door body is provided at the cleaning window, and the height of the cleaning window matches the height of the filter plate.

[0010] In some embodiments, the inner wall of the pickling tank is coated with an anti-corrosion coating, and the outer wall of the pickling tank is coated with a heat insulation coating.

[0011] The beneficial effects of the present application are as follows: by setting the first rotating shaft and the second rotating shaft so that they can respectively drive the first stirring blade and the second stirring blade to rotate, the solution and the copper-cadmium slag in the stirring tank are fully stirred so that the sulfuric acid solution and the copper-cadmium slag can be quickly contacted, thereby increasing the pickling speed. Also, by setting the first bevel gear and the second bevel gear to mesh, a rotating motor can simultaneously drive the first rotating shaft and the second rotating shaft to rotate. On the other hand, the second stirring blade can drive the solution to flow upward during the flipping process, and then the particles blocked in the filter plate can be blown out to ensure that the filter plate can work continuously. Also, by setting the bottom of the pickling tank to a V shape and setting a filter plate, the filter plate will block the large-size copper-cadmium slag from entering the discharge pump to prevent it from causing damage to subsequent components, and setting the bottom of the pickling tank to a V shape can effectively prevent the residue from accumulating at the bottom of the pickling tank.

[0012] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0014] Figure 1 A schematic diagram of the overall structure of a copper-cadmium slag acid leaching treatment device provided in an embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the pickling tank provided in an embodiment of the present application.

[0016] The reference numerals in the specific implementation manner are as follows:

[0017] A copper-cadmium slag acid leaching treatment device 100, a feeding component 110, a discharge barrel 111, a sulfuric acid storage tank 112, a sulfuric acid pump 112a, a pickling tank 120, a discharge pipe 121, a discharge pump 122, a support frame 123, a first rotating shaft 124, a first stirring blade 124a, a rotating motor 125, a filter plate 126, a first bevel gear 127, a second bevel gear 128, a second rotating shaft 129, a second stirring blade 129a, a heating coil 130, a heat source input end 131, a heat source output end 132, a support assembly 140, and a sealing door body 150. DETAILED DESCRIPTION

[0018] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and cannot be used to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned description of the drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0019] Specifically, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of the copper-cadmium slag acid leaching treatment device provided in the embodiment of the present application, Figure 2A schematic diagram of the cross-sectional structure of the pickling tank provided in the embodiment of the present application. The copper-cadmium slag acid leaching treatment device 100 includes a pickling tank 120, which is the reaction site of the pickling process. It is a prior art, and it should be understood that the pickling tank 120 can be protected from corrosion by coating anti-corrosion materials and the like. A feeding component 110 is provided on the pickling tank 120, and the feeding component 110 is used to feed copper-cadmium slag and sulfuric acid solution into the pickling tank 120. The bottom of the pickling tank 120 contracts inward to form a feed pipe 121. The above-mentioned arrangement makes the bottom of the pickling tank 120 V-shaped, which facilitates the tiny particles to slide along the bottom wall of the pickling tank 120 into the feed pipe 121 under the action of gravity. The bottom end of the feed pipe 121 is connected to a discharge pump 122, which is used to discharge the solution in the pickling tank 120 after the pickling is completed (copper sulfate and chromium sulfate solutions will be generated after the reaction is completed, and this part of the solution can be used to recover copper and chromium through other processes). A support frame 123 is provided at the bottom of the inner cavity of the pickling tank 120, and a first rotating shaft 124 is rotatably provided on the support frame 123. The support frame 123 is used to set up the first rotating shaft 124. The support frame 123 may include a plurality of thin rods for supporting so as to reduce the blocking area of ​​the support frame 123 to the water flow. The other end of the first rotating shaft 124 penetrates upward to the top of the pickling tank 120 and is connected to a rotating motor 125, which is used to drive the first rotating shaft 124 to rotate. A plurality of first stirring blades 124a are connected to the outer circumference of the first rotating shaft 124 at an angle. The first rotating shaft 124 drives the first stirring blades 124a to rotate synchronously during the rotation process. The first stirring blades 124a stir the solution in the pickling tank 120 and turn it over, thereby increasing the reaction speed in the pickling tank 120. A filter plate 126 is arranged in the pickling tank 120, and the first rotating shaft 124 penetrates the filter plate 126. The filter plate 126 is provided with filter holes, and the solution and some solid powders with a diameter smaller than the filter holes can pass through the filter plate 126. During the reaction process, when the copper-cadmium slag is put into the pickling tank 120, it will be located at the top of the filter plate 126. After the copper-cadmium slag participates in the reaction, when the remaining powder is smaller than the filter hole, the powder will pass through the filter plate 126 and move downward under the drive of the solution. At this time, the diameter of the powder meets the needs of subsequent production and will not affect the components such as the discharge pump 122 and the first bevel gear 127. A first bevel gear 127 is externally connected to the bottom end of the first rotating shaft 124, and at least two second bevel gears 128 are connected to the first bevel gear 127. The central axis of the second bevel gear 128 is connected to the second rotating shaft 129. When the first rotating shaft 124 is driven by the rotating motor 125 to rotate, the first rotating shaft 124 will synchronously drive the second rotating shaft 129 to rotate through the transmission of the first bevel gear 127 and the second bevel gear 128.The other end of the second rotating shaft 129 is rotatably connected to the inner wall of the pickling tank 120 . The second rotating shaft 129 is connected to a second stirring blade 129 a . The second rotating shaft 129 can drive the second stirring blade 129 a to flip around the central axis of the second rotating shaft 129 during rotation.

[0020] In the embodiment of the present application, the specific working process is as follows: copper-cadmium slag and sulfuric acid solution are respectively fed into the pickling tank 120 by a feeding device; the copper-cadmium slag is blocked by the filter plate 126 and falls on the top of the filter plate 126; sulfuric acid solution is added to the pickling tank 120 until its liquid level submerges the filter plate 126; and then the rotating motor 125 is turned on; the rotating motor 125 drives the first stirring blade 124a to rotate through the first rotating shaft 124, thereby driving the solution in the pickling tank 120 to fully contact the copper-cadmium slag to increase the pickling speed; after the pickling continues for a period of time, the copper-cadmium slag reacts with the sulfuric acid and dissolves, and the remaining larger particles of impurities will be retained on the filter plate 126, and the small particle size trace impurities will pass through the filter plate 126 with the solution. At the same time, the first rotating shaft 124 will drive the second rotating shaft 129 and the second stirring blade 129a to rotate through the first bevel gear 127 and the second bevel gear 128. Since the second stirring blade 129a rotates along the central axis of the second rotating shaft 129, the second stirring blade 129a will stir the solution upwards during the rotation, and the impurities blocked in the filter hole can be blown out. At the same time, the upward liquid can drive the copper-cadmium slag solid on the top of the filter plate 126 to turn over, further enhancing the pickling speed. After the reaction continues for a period of time, the discharge pump 122 works to export the solution in the pickling tank 120 and some impurities that pass through the filter plate 126 (at this time, the particle size of the impurities is small, and the purity of the copper sulfate and chromium sulfate solutions is within a reasonable range).

[0021] As can be seen from the above, in the embodiment of the present application, the first rotating shaft 124 and the second rotating shaft 129 are arranged to respectively drive the first stirring blade 124a and the second stirring blade 129a to rotate, thereby fully stirring the solution and the copper-cadmium slag in the stirring tank so that the sulfuric acid solution and the copper-cadmium slag can be quickly contacted, thereby increasing the pickling speed. The first bevel gear 127 and the second bevel gear 128 are also arranged to mesh so that a rotating motor 125 can simultaneously drive the first rotating shaft 124 and the second rotating shaft 129 to rotate. On the other hand, the second stirring blade 129a can drive the solution to flow upward during the flipping process, thereby blowing out the particles blocked in the filter plate 126, ensuring that the filter plate 126 can work continuously. In the embodiment of the present application, the bottom of the pickling tank 120 is set to a V shape and a filter plate 126 is set. The filter plate 126 will block the large-particle copper-cadmium slag from entering the discharge pump 122 to prevent it from causing damage to subsequent components. Setting the bottom of the pickling tank 120 to a V shape can effectively prevent residue from accumulating at the bottom of the pickling tank 120.

[0022] In some embodiments, the feeding component 110 includes a lower barrel 111 and a sulfuric acid storage tank 112. The top of the lower barrel 111 is in an open funnel shape, and the bottom of the lower barrel 111 is connected to the pickling tank 120. The sulfuric acid storage tank 112 is connected to the pickling tank 120 through a sulfuric acid pump 112a and a pipeline. In this embodiment, the copper-cadmium slag can be put into the pickling tank 120 through the lower barrel 111, and the sulfuric acid pump 112a can pump the sulfuric acid solution in the sulfuric acid storage tank 112 into the pickling tank 120 during operation.

[0023] In some embodiments, a heating coil 130 is spirally arranged in the inner cavity of the pickling tank 120, and the heating coil 130 is arranged close to the inner wall of the pickling tank 120. The two ends of the heating coil 130 respectively form a heat source input end 131 and a heat source output end 132, and the heat source input end 131 and the heat source output end 132 both extend to the outside of the pickling tank 120. In the embodiment of the present application, through the above arrangement, the heat source input end 131 and the heat source output end 132 can be connected respectively, and the heat transfer medium is circulated into the heating coil 130 to heat the inside of the pickling tank 120 to accelerate the reaction speed in the pickling tank 120. The heat transfer medium here can be water vapor, heat transfer oil or water. The temperature in the pickling tank 120 can be controlled at 25-35 degrees Celsius.

[0024] In some embodiments, a support assembly 140 is connected to the bottom of the pickling tank 120. In the embodiment of the present application, the pickling tank 120 can be supported by providing the support assembly 140, so that the bottom of the pickling tank 120 is suspended above the ground, which is convenient for discharging.

[0025] In some embodiments, a cleaning window is provided on the side wall of the pickling tank 120, and a sealing door body 150 is provided at the cleaning window, and the height of the cleaning window matches the height of the filter plate 126. In the embodiment of the present application, through the above arrangement, since some impurities will remain in the filter screen during the reaction process, the filter screen can be manually cleaned through the cleaning window after opening the sealing door body 150.

[0026] In some embodiments, the inner wall of the pickling tank 120 is coated with an anti-corrosion coating, and the outer wall of the pickling tank 120 is coated with a heat-insulating coating. In the embodiment of the present application, the anti-corrosion coating is applied to prevent the interior of the pickling tank 120 from being corroded by sulfuric acid, and it can be understood that the other components in the pickling tank 120 can also be coated with the anti-corrosion coating. On the other hand, the heat-insulating coating is provided to keep the interior of the pickling tank 120 at a stable temperature, avoiding temperature changes caused by heat transfer between it and the outside.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A copper-cadmium slag acid leaching treatment device, characterized in that: It comprises a pickling tank, on which a feeding component is arranged, the bottom of the pickling tank is contracted inward to form a feeding pipe, the bottom end of the feeding pipe is connected with a discharging pump, a support frame is arranged at the bottom of the inner cavity of the pickling tank, a first rotating shaft is rotatably arranged on the support frame, the other end of the first rotating shaft passes upward to the top of the pickling tank and is connected with a rotating motor, and a plurality of first stirring blades are connected with an outer circumference of the first rotating shaft at an angle upward; A filter plate is arranged horizontally in the pickling tank, the first rotating shaft passes through the filter plate, a first bevel gear is externally connected to the bottom end of the first rotating shaft, at least two second bevel gears are connected to the first bevel gear, a second rotating shaft is connected to the central axis of the second bevel gear, the other end of the second rotating shaft is rotatably connected to the inner wall of the pickling tank, and a second stirring blade is connected to the second rotating shaft.

2. The copper-cadmium slag acid leaching treatment device according to claim 1, characterized in that: The feeding component includes a feeding cylinder and a sulfuric acid storage tank. The top of the feeding cylinder is in the shape of an open funnel. The bottom of the feeding cylinder is connected to the pickling tank. The sulfuric acid storage tank is connected to the pickling tank through a sulfuric acid pump and a pipeline.

3. The copper-cadmium slag acid leaching treatment device according to claim 1, characterized in that: A heating coil is spirally arranged in the inner cavity of the pickling tank. The heating coil is arranged close to the inner wall of the pickling tank. The two ends of the heating coil respectively form a heat source input end and a heat source output end. The heat source input end and the heat source output end both extend to the outside of the pickling tank.

4. The copper-cadmium slag acid leaching treatment device according to claim 1, characterized in that: The bottom of the pickling tank is connected with a supporting assembly.

5. The copper-cadmium slag acid leaching treatment device according to claim 1, characterized in that: A cleaning window is arranged on the side wall of the pickling tank, a sealing door body is arranged at the cleaning window, and the height of the cleaning window matches the height of the filter plate.

6. The copper-cadmium slag acid leaching treatment device according to claim 1, characterized in that: The inner wall of the pickling tank is coated with an anti-corrosion coating, and the outer wall of the pickling tank is coated with a heat insulation coating.

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