Leaching device for zinc sulfate purification equipment

Abstract

The utility model relates to a leaching device for zinc sulfate purification equipment. The leaching device comprises a leaching tank, a filter plate, an air inlet pipe, an exhaust pipe and a barometer, the leaching tank comprises an outer tank and an inner tank, the inner tank is arranged at the upper part in the outer tank, so that a filtering chamber is formed between the bottom of the inner tank and the outer tank, and a filtering plate is arranged in the filtering chamber and is used for filtering solid impurities such as slag after reaction; the exhaust pipe is communicated into the inner tank to extract toxic tail gas, the gas inlet pipe is communicated into the inner tank and releases inert gas to perform low-pressure compensation of the inner tank, and the barometer is combined, so that the gas pressure of the inner tank is kept stable, and the situation that low pressure promotes generation of harmful gas is avoided. The device can effectively solve the problem that harmful tail gas and solid residues generated in the zinc sulfate leaching reaction are inconvenient to treat, the process is simplified, and the harmful gas is prevented from being directly discharged into the atmosphere to cause harm.

Description

Technical Field

[0001] The utility model relates to the technical field of zinc sulfate production, in particular to a leaching device for zinc sulfate purification equipment. Background Art

[0002] The existing process flow for preparing zinc sulfate solution is to put the zinc oxide raw material into the reaction tank, add sulfuric acid for acid leaching reaction, and because the raw material contains metal impurities such as zinc, iron, copper, and calcium, it is also necessary to use hydrogen peroxide for redox reaction and zinc powder for displacement reaction to remove impurities. During the leaching reaction, harmful gases such as sulfur dioxide and hydrogen will be produced. These harmful gases will be directly discharged into the air, which will affect the physical and mental health of the operators and have adverse effects on the environment. The tail gas needs to be collected and treated.

[0003] In addition, since the raw materials themselves contain solid residues such as slag, the zinc sulfide liquid output from the reaction tank needs to be filtered additionally to separate the solid and liquid, and the process is cumbersome. Therefore, a leaching device that can simultaneously treat harmful tail gas and solid residues is needed.

[0004] Based on this, it is necessary to study a leaching device for zinc sulfate purification equipment. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a leaching device for zinc sulfate purification equipment, which can effectively solve the problem that harmful tail gas and solid residue generated in the zinc sulfate leaching reaction are inconvenient to handle.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A leaching device for zinc sulfate purification equipment, characterized in that it comprises a leaching tank, a filter plate, an air inlet pipe, an air extraction pipe and a barometer;

[0008] The leaching tank comprises an outer tank and an inner tank, wherein the inner tank is arranged above the inner part of the outer tank, so that a filter chamber is formed between the bottom of the inner tank and the outer tank, and a filter plate is arranged in the filter chamber;

[0009] A feed inlet is provided above the leaching tank, the feed inlet is connected to the inner tank, and a feed valve is provided on the feed inlet;

[0010] The bottom of the inner tank is provided with a discharge port connected to the filter chamber, and a discharge valve is provided on the discharge port;

[0011] The bottom of the outer tank is provided with a discharge port, and a discharge valve is provided on the discharge port;

[0012] The air intake pipe is connected to the inner tank and releases the inert gas, and an air intake valve is arranged on the air intake pipe;

[0013] One end of the exhaust pipe is connected to the inner tank, an exhaust valve and a negative pressure fan are arranged in the middle of the exhaust pipe, and the other end of the exhaust pipe is connected to the exhaust gas treatment system;

[0014] The barometer is arranged on the leaching tank and detects the air pressure inside the tank.

[0015] Furthermore, it also includes a stirring device, which includes a motor, a rotating shaft, a blocking ring and a stirring blade; the upper part of the leaching tank is provided with a mounting hole that passes through to the inner tank, the blocking ring is fixedly sleeved in the mounting hole, and the motor is mounted on the upper end surface of the blocking ring;

[0016] The rotating shaft is connected with the motor in driving mode and passes through the sealing ring to be rotatably arranged in the inner tank. A stirring blade is arranged on the rotating shaft.

[0017] Furthermore, it also includes a heating pipe, the leaching tank is provided with a heating port connected to the inner tank, the input end of the heating pipe passes through the heating port and enters the inner tank from the outside, the stirring blades are distributed at the lower part of the inner tank, the heating pipe is spirally arranged around the rotating shaft in the middle part of the inner tank, and the output end of the heating pipe passes through the heating port and returns to the outside;

[0018] A temperature sensor is arranged at the lower part of the inner tank.

[0019] Furthermore, a diverter is installed on the discharge port.

[0020] Furthermore, the outer tank is provided with an inspection door connected to the filter chamber.

[0021] The beneficial effects of the above technical solution are:

[0022] (1) The leaching tank of the utility model comprises an outer tank and an inner tank. The leaching reaction is carried out in the inner tank. A filter chamber is formed between the bottom of the inner tank and the outer tank. A filter plate is arranged in the filter chamber. Solid impurities such as slag after the reaction are filtered by gravity. There is no need to additionally pump and filter the zinc sulfide liquid output from the reaction tank, thereby simplifying the process.

[0023] (2) The utility model uses an exhaust pipe to extract and collect harmful exhaust gas generated by the reaction in the inner tank, and uniformly transports it to the exhaust gas treatment system for centralized treatment. In addition, in order to prevent the leakage of harmful gases, the inner tank needs to be sealed. Extracting gas alone will cause low pressure to form in the inner tank, and low pressure will promote the chemical reaction of harmful gas production. To this end, the utility model connects the air intake pipe to the inner tank and releases inert gas, and combines it with a barometer to compensate for the low pressure of the inner tank, so that the air pressure in the inner tank remains stable, avoiding the situation where low pressure promotes the generation of harmful gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0025] Figure 2 for Figure 1 A partial enlarged view of the circled area.

[0026] Figure numerals: 1 is an extraction tank, 2 is a filter plate, 3 is an air inlet pipe, 4 is an exhaust pipe, 5 is a barometer, 6 is a feed port, 7 is a discharge port, 8 is a discharge port, 9 is a stirring device, 10 is a heating tube, 11 is a temperature sensor, 12 is a diverter, 13 is an inspection door, 101 is an outer tank, 102 is an inner tank, 103 is a filter chamber, 104 is a mounting hole, 301 is an air inlet valve, 401 is an exhaust valve, 402 is a negative pressure fan, 601 is a feed valve, 701 is a discharge valve, 801 is a discharge valve, 901 is a motor, 902 is a rotating shaft, 903 is a sealing ring, 904 is a stirring blade, 905 is a bearing, 906 is a sealing gasket, 1001 is an input end, and 1002 is an output end. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods:

[0028] The present embodiment aims to provide a leaching device for zinc sulfate purification equipment, which is mainly used in the leaching process of zinc sulfate purification process, and aims to solve the problem that harmful tail gas and solid residue generated in the zinc sulfate leaching reaction are inconvenient to handle.

[0029] A leaching device for zinc sulfate purification equipment, such as Figure 1 , including a leaching tank 1, a filter plate 2, an air inlet pipe 3, an exhaust pipe 4 and a barometer 5; the leaching tank 1 includes an outer tank 101 and an inner tank 102, the inner tank 102 is arranged above the inner tank 101, the inner tank 102 is used as the main body for the actual chemical reaction, and the outer tank 101 is used as a protective layer to prevent accidents or leakage, and the reaction in the inner tank 102 is preferably maintained at about 80 degrees Celsius, and the outer tank 101 can play a role in heat insulation and heat preservation. A filter chamber 103 is formed between the bottom of the inner tank 102 and the outer tank 101, and a filter plate 2 is arranged in the filter chamber 103, and the filter plate 2 is used to perform solid-liquid separation on the zinc sulfate liquid output from the inner tank 102, and separate solid impurities such as slag.

[0030] A feed port 6 is provided above the leaching tank 1, and the feed port 6 is connected to the inner tank 102. A feed valve 601 is provided on the feed port 6. The feed valve 601 is used to control the input of materials. The input materials include zinc oxide raw materials and leaching solutions containing sulfuric acid. The feed port 6 can be provided at one place or multiple places to correspond to different materials. A discharge port 7 connected to the filter chamber 103 is provided at the bottom of the inner tank 102. A discharge valve 701 is provided on the discharge port 7. The discharge valve 701 is used to control the output of the bottom flow of the inner tank 102. The discharge valve 701 uses an electric control valve. A discharge port 8 is provided at the bottom of the outer tank 101. A discharge valve 801 is provided on the discharge port 8 to output the filtered zinc sulfate liquid.

[0031] One end of the exhaust pipe 4 is connected to the inner tank 102. An exhaust valve and a negative pressure fan 402 are provided in the middle of the exhaust pipe 4 to extract and collect the harmful tail gas generated by the reaction in the inner tank 102. The exhaust valve is used to switch the exhaust pipe 4. The other end of the exhaust pipe 4 is connected to the tail gas treatment system. The tail gas treatment system is mainly used to treat harmful tail gases such as sulfur dioxide and hydrogen, including an alkali liquid tank, an activated carbon box, etc. The tail gas treatment system used in the zinc sulfate leaching process is a prior art and has been widely used in this technical field, so it will not be repeated here. In order to prevent the leakage of harmful gases, the inner tank 102 needs to be sealed, and only extracting gas will cause the inner tank to A low pressure is formed in 102, and the low pressure will promote the chemical reaction of the production of harmful gases. To address this situation, the present embodiment adopts an air inlet pipe 3 to be connected to the inner tank 102 and release the inert gas. The air inlet pipe 3 is provided with an air inlet valve 301, and the air inlet valve 301 is used to control the release of the inert gas and prevent the gas from flowing back and leaking. The barometer 5 is arranged on the leaching tank 1 and detects the air pressure of the inner tank 102. In combination with the barometer 5, the staff or the controller controls the air inlet valve 301 and the air extraction valve 401 to compensate for the low pressure of the inner tank 102, so that the air pressure of the inner tank 102 remains stable, and avoids the situation where low pressure promotes the production of harmful gases.

[0032] In order to increase the reaction rate in the inner tank 102, as Figure 1 , further comprising a stirring device 9, the stirring device 9 comprising a motor 901, a rotating shaft 902, a sealing ring 903 and a stirring blade 904; Figure 2A mounting hole 104 penetrating to the inner tank 102 is provided at the upper part of the leaching tank 1, a sealing ring 903 is fixedly sleeved in the mounting hole 104, a motor 901 is installed on the upper end surface of the sealing ring 903, and a sealing gasket 906 is also provided between the motor 901 and the sealing ring 903; a through hole is provided in the middle part of the sealing ring 903, a rotating shaft 902 is transmission-connected with the motor 901, the rotating shaft 902 extends through the through hole into the inner tank 102, a bearing 905 is provided between the rotating shaft 902 and the through hole, so that the rotating shaft 902 is rotatably arranged in the inner tank 102, and a stirring blade 904 is provided on the rotating shaft 902 to stir the liquid in the inner tank 102 and improve the reaction rate.

[0033] In order to increase the reaction rate in the inner tank 102, as Figure 1 , and also includes a heating pipe 10. The leaching tank 1 is provided with a heating port connected to the inner tank 102. The input end 1001 of the heating pipe 10 passes through the heating port and enters the inner tank 102 from the outside. The stirring blades 904 are distributed at the lower part of the inner tank 102. The heating pipe 10 is spirally arranged around the rotating shaft 902 in the middle of the inner tank 102. The output end 1002 of the heating pipe 10 passes through the heating port and returns to the outside. Hot water or hot air circulates in the heating pipe 10. The hot water or hot air is input from the input end 1001, flows through the inner tank 102 for heat exchange, and leaves the inner tank 102 from the output end 1002. A temperature sensor 11 is arranged at the lower part of the inner tank 102 for detecting the reaction temperature of the liquid. The reaction temperature is best controlled at about 80 degrees Celsius.

[0034] In order to improve the filtering effect of the filter plate 2, a diverter 12 is installed on the discharge port 8. The diverter 12 is provided with a plurality of through holes, which can disperse the bottom flow into a plurality of divergent tributaries, so that when the discharge port 8 outputs the bottom flow, the contact area between the bottom flow and the filter plate 2 is increased, thereby improving the filtering effect.

[0035] In order to facilitate cleaning and maintenance of the filter chamber 103, an inspection door 13 connected to the filter chamber 103 is provided on the outer tank 101, and the inspection door 13 needs to be sealed when closed.

Claims

1. A leaching device for zinc sulfate purification equipment, characterized in that: It includes a leaching tank, a filter plate, an air inlet pipe, an air extraction pipe and a barometer; The leaching tank comprises an outer tank and an inner tank, wherein the inner tank is arranged above the inner part of the outer tank, so that a filter chamber is formed between the bottom of the inner tank and the outer tank, and a filter plate is arranged in the filter chamber; A feed inlet is provided above the leaching tank, the feed inlet is connected to the inner tank, and a feed valve is provided on the feed inlet; The bottom of the inner tank is provided with a discharge port connected to the filter chamber, and a discharge valve is provided on the discharge port; The bottom of the outer tank is provided with a discharge port, and a discharge valve is provided on the discharge port; The air intake pipe is connected to the inner tank and releases the inert gas, and an air intake valve is arranged on the air intake pipe; One end of the exhaust pipe is connected to the inner tank, an exhaust valve and a negative pressure fan are arranged in the middle of the exhaust pipe, and the other end of the exhaust pipe is connected to the exhaust gas treatment system; The barometer is arranged on the leaching tank and detects the air pressure inside the tank.

2. A leaching device for zinc sulfate purification equipment according to claim 1, characterized in that: It also includes a stirring device, which includes a motor, a rotating shaft, a blocking ring and a stirring blade; the upper part of the leaching tank is provided with a mounting hole that passes through to the inner tank, the blocking ring is fixedly sleeved in the mounting hole, and the motor is mounted on the upper end surface of the blocking ring; The rotating shaft is connected with the motor in driving mode and passes through the sealing ring to be rotatably arranged in the inner tank. A stirring blade is arranged on the rotating shaft.

3. A leaching device for zinc sulfate purification equipment according to claim 2, characterized in that: It also includes a heating pipe, the leaching tank is provided with a heating port connected to the inner tank, the input end of the heating pipe passes through the heating port and enters the inner tank from the outside, the stirring blades are distributed at the lower part of the inner tank, the heating pipe is spirally arranged around the rotating shaft in the middle part of the inner tank, and the output end of the heating pipe passes through the heating port and returns to the outside; A temperature sensor is arranged at the lower part of the inner tank.

4. A leaching device for zinc sulfate purification equipment according to claim 1, characterized in that: A flow divider is installed on the discharge port.

5. A leaching device for zinc sulfate purification equipment according to any one of claims 1 to 4, characterized in that: The outer tank is provided with an inspection door connected to the filter chamber.

Images