Zinc sulfide concentrate leaching device

Abstract

The utility model relates to the field of metallurgical equipment, and discloses a zinc sulfide concentrate leaching device which comprises a ball mill, an autoclave, a flash tank and an adjusting tank which are connected in sequence, leachate enters the autoclave through a tube pass of a heat exchanger, and flash steam of the flash tank is connected with a shell pass of the heat exchanger; a buffer tank is arranged between the ball mill and the autoclave, a feed port of the buffer tank is connected with the ball mill, and a discharge port of the buffer tank is connected with the autoclave; a jacket is arranged outside the buffer tank and is connected with a steam outlet of a shell pass of the heat exchanger through a first pipeline; a gas distribution pipe is also arranged in the buffer tank and is connected with a steam outlet of the autoclave through a second pipeline. The steam generated after the leachate is preheated and the steam generated by the autoclave are used for preheating the ore pulp, the temperature of the ore pulp entering the autoclave is increased by recovering the heat energy of the steam, and the use amount of the steam in the autoclave is reduced, so that the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of metallurgical equipment, in particular to a zinc sulfide concentrate leaching device. Background Art

[0002] The current zinc sulfide concentrate leaching process is as follows: the zinc sulfide concentrate is ground in a ball mill to a particle size of 95% less than 44 μm, and after adding a surfactant, it is pumped into the first chamber of the autoclave; at the same time, the leaching solution (zinc electrolytic deposition waste electrolyte) preheated to 343K and industrial oxygen are pumped in, the leaching temperature is 418-428K (the autoclave is heated by steam introduced into the coil), the leaching pressure is 1300 kPa, and the leached pulp is discharged from the autoclave to the flash tank, where the pressure is reduced to 100 kPa, and the steam generated by the flash is used to preheat the leaching solution, and the pulp is then discharged from the flash tank into the regulating tank. The current zinc sulfide concentrate leaching process has the following defects:

[0003] 1. Flash steam preheats the leaching liquid and then discharges it directly. Its heat energy cannot be fully utilized, resulting in heat energy waste;

[0004] 2. The steam generated by the autoclave is not fully utilized, resulting in a waste of heat energy;

[0005] 3. The slurry after ball milling is not preheated before entering the autoclave, and more steam is needed to heat it to reach the required leaching temperature.

[0006] Based on this, the present application provides a zinc sulfide concentrate leaching device that can use excess steam from an autoclave and a heat exchanger to preheat zinc sulfide slurry to reduce the amount of steam used in the autoclave to solve the above problems. Utility Model Content

[0007] The utility model aims to solve the problems of heat energy waste and large steam consumption in the existing zinc sulfide concentrate leaching device. To this end, the utility model provides a zinc sulfide concentrate leaching device that can use excess steam from an autoclave and a heat exchanger to preheat zinc sulfide slurry to reduce the steam consumption of the autoclave.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] Provided is a zinc sulfide concentrate leaching device, comprising a ball mill, an autoclave, a flash tank and an adjusting tank connected in sequence, wherein the leachate enters the autoclave through the tube side of a heat exchanger, and the flash steam of the flash tank is connected to the shell side of the heat exchanger; a buffer tank is further provided between the ball mill and the autoclave, wherein the feed port of the buffer tank is connected to the ball mill, and the discharge port of the buffer tank is connected to the autoclave; a jacket is provided outside the buffer tank, and the jacket is connected to the steam outlet of the shell side of the heat exchanger through a first pipeline; an air distribution pipe is further provided inside the buffer tank, and the air distribution pipe is connected to the steam outlet of the autoclave through a second pipeline.

[0010] Preferably, the air distribution pipe includes a connecting pipe and an annular pipe, one end of the connecting pipe is connected to the annular pipe arranged at the bottom of the buffer tank, and the other end is connected to the second pipeline, and a plurality of air distribution holes are evenly distributed on the annular pipe.

[0011] Preferably, an exhaust pipe is provided on the top of the cache tank.

[0012] Preferably, a condensate discharge pipe is provided at the bottom of the jacket, and the condensate discharge pipe is connected to a water tank.

[0013] Preferably, a stirring device is also provided in the buffer tank to prevent the slurry from settling.

[0014] Preferably, the buffer tank is also provided with a surfactant injection pipe for injecting the surfactant.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model sets a buffer tank between the ball mill and the autoclave. In subsequent production, the ore pulp first enters the buffer tank, and the ore pulp is preheated by using the steam from preheating the leaching liquid and the steam generated by the autoclave. The heat energy of the steam is recovered to increase the temperature of the ore pulp entering the autoclave, and the use of steam in the autoclave is reduced, thereby saving production costs. In addition, the steam discharged from the air distribution pipe in the buffer tank can also play a role in aeration and stirring the mine, making the ore pulp more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 It is a structural schematic diagram of a zinc sulfide concentrate leaching device provided by the utility model;

[0019] Figure 2 yes Figure 1 A schematic structural diagram of the cache tank is provided.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1—ball mill, 2—buffer tank, 2.1—steam outlet, 2.2—condensate outlet pipe, 3—autoclave, 4—flash tank, 5—regulating tank, 6—heat exchanger, 7—first pipeline, 8—water tank, 9—gas distribution pipe, 9.1—connecting pipe, 9.2—annular pipe, 10—second pipeline, 11—exhaust pipe, 12—stirring device, 13—active agent injection pipe. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific position, be constructed and operate in a specific position, and therefore should not be understood as limiting the present invention;

[0025] In addition, the descriptions involving the terms "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] Embodiment: This embodiment provides a zinc sulfide concentrate leaching device, as shown in the attached Figure 1 and attached Figure 2 As shown, it includes a ball mill 1, a buffer tank 2, an autoclave 3, a flash tank 4, an adjustment tank 5, and a heat exchanger 6 for heating the leachate, which are connected in sequence. The buffer tank 2 is preferably a buffer tank with a jacket, the feed port of the buffer tank 2 is connected to the ball mill 1, and the discharge port thereof is connected to the autoclave 3. The jacket of the buffer tank 2 is connected to the steam outlet of the shell side of the heat exchanger 6 through a first pipeline 7. The jacket is provided with a steam outlet 2.1 and a condensate discharge pipe 2.2, which are used to discharge steam and condensate respectively, and the condensate discharge pipe 2.2 is connected to a water receiving tank 8.

[0028] Working principle: The zinc sulfide concentrate is ground by a ball mill to a particle size of 95% less than 44μm, and then the slurry is pumped into the buffer tank, and then pumped into the first chamber of the autoclave through the buffer tank; at the same time, the leachate preheated to 343K and industrial oxygen are pumped into the autoclave, and the leachate is heated by a heat exchanger. Specifically, the tube side of the heat exchanger passes the leachate, and the shell side passes the high-temperature steam. That is, the leachate enters the autoclave through the tube side of the heat exchanger, and the slurry is leached through the autoclave and discharged to the flash tank, where the pressure is reduced to 100kPa, and then discharged from the flash tank into the regulating tank. The flash steam of the flash tank is connected to the shell side of the heat exchanger to heat the leachate. After the flash steam comes out of the heat exchanger, it enters the jacket of the buffer tank to preheat the slurry entering the autoclave.

[0029] Furthermore, the buffer tank 2 is also provided with an air distribution pipe 9, and the air distribution pipe 9 is connected to the steam outlet of the autoclave 3 through the second pipe 10. Preferably, the air distribution pipe 9 includes a connecting pipe 9.1 and an annular pipe 9.2, one end of the connecting pipe 9.1 is connected to the annular pipe 9.2 arranged at the bottom of the buffer tank 2, and the other end is connected to the second pipe 10, and the annular pipe 9.2 is evenly distributed with a number of air distribution holes. Since the slurry in the buffer tank needs to be pumped into the autoclave, the steam generated by the autoclave can be directly introduced into the slurry to directly heat the slurry. This design can further utilize the steam generated by the autoclave to heat the slurry, further increase the temperature of the slurry when it enters the autoclave, thereby maintaining the leaching temperature in the autoclave well and saving the amount of heating steam for the autoclave; in addition, the steam discharged from the air distribution pipe in the buffer tank can also play a role in aeration and stirring the mine, making the slurry more uniform.

[0030] Preferably, an exhaust pipe 11 is provided on the top of the cache tank 2 for exhausting gas.

[0031] Preferably, the buffer tank 2 is further provided with a stirring device 12, which can be used to stir the slurry to prevent the slurry from settling.

[0032] Preferably, the buffer tank 2 is also provided with an active agent injection pipe 13 for injecting a surfactant. After the ball mill pumps the slurry into the buffer tank, the surfactant can be injected through the active agent injection pipe, and the surfactant and the slurry can be evenly mixed in cooperation with the stirring device and the air distribution pipe.

[0033] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A zinc sulfide concentrate leaching device, comprising a ball mill, an autoclave, a flash tank and an adjusting tank connected in sequence, wherein the leachate enters the autoclave through the tube side of the heat exchanger, and the flash steam of the flash tank is connected to the shell side of the heat exchanger; characterized in that: A buffer tank is also provided between the ball mill and the autoclave, wherein the feed port of the buffer tank is connected to the ball mill, and the discharge port of the buffer tank is connected to the autoclave; The buffer tank is provided with a jacket outside, and the jacket is connected to the steam outlet of the shell side of the heat exchanger through a first pipeline; An air distribution pipe is also provided in the buffer tank, and the air distribution pipe is connected to the steam outlet of the autoclave through a second pipeline.

2. The zinc sulfide concentrate leaching device according to claim 1, characterized in that: The air distribution pipe includes a connecting pipe and an annular pipe. One end of the connecting pipe is connected to the annular pipe arranged at the bottom of the buffer tank, and the other end is connected to the second pipeline. A plurality of air distribution holes are evenly distributed on the annular pipe.

3. The zinc sulfide concentrate leaching device according to claim 1, characterized in that: An exhaust pipe is provided on the top of the cache tank.

4. The zinc sulfide concentrate leaching device according to claim 1, characterized in that: A condensate discharge pipe is provided at the bottom of the jacket, and the condensate discharge pipe is connected to a water tank.

5. The zinc sulfide concentrate leaching device according to any one of claims 1 to 4, characterized in that: The buffer tank is also provided with a stirring device to prevent the slurry from settling.

6. The zinc sulfide concentrate leaching device according to claim 5, characterized in that: The buffer tank is also provided with a surfactant injection pipe for injecting the surfactant.

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