Chlorine absorption and neutralization device suitable for low-temperature environment in electrodeposited cobalt production

Abstract

The utility model discloses a chlorine gas absorption and neutralization device suitable for low-temperature environment in electrodeposited cobalt production, and belongs to the technical field of organic chemical industry production. The steam inlet is formed in the side wall of the original chlorine absorption tower, so that the whole chlorine absorption tower is filled with steam, sprayed alkali liquor and the inside of the chlorine absorption tower are heated by utilizing heat of the steam, and crystals are effectively prevented from being separated out from the alkali liquor. In addition, the alkali liquor intermediate tank is further arranged, a small amount of crystals flowing out of the chlorine gas absorption tower are deposited in the alkali liquor intermediate tank, and the crystals can be effectively deposited and cannot enter the alkali liquor circulating tank due to the fact that the inlet position of the alkali liquor intermediate tank is lower than the outlet position. The heating pipeline is additionally arranged in the alkali liquor circulating tank, liquid such as steam or hot water can be introduced into the heating pipeline, and the alkali liquor is heated, the pH value is adjusted, and then the alkali liquor is circularly fed into the chlorine gas absorption tower; it is guaranteed that chlorine in chlorine-containing waste gas can still be absorbed in northern areas and other cold weather areas, and alkali liquor precipitation crystals and generation of sodium hypochlorite are reduced to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic chemical production, and particularly relates to a chlorine absorption and neutralization device applicable to chlorine electrowinning cobalt production in a low-temperature environment. Background Art

[0002] In the process of producing electrowinning cobalt using cobalt chloride liquid as the electrolyte, the anode generates chlorine-containing waste gas during electrowinning, which has a great impact on production equipment and environmental protection. In Northeast China, the lowest temperature at the location of electrowinning cobalt production can reach -42.6°C. In such a low-temperature environment, although alkaline solution can be used to absorb chlorine-containing waste gas, when the environmental temperature is low, the alkaline solution is prone to crystal precipitation, blocking the chlorine absorption tower, spray nozzles, inlet and outlet pipelines, and packing, resulting in a significant decrease in the absorption efficiency of chlorine-containing waste gas and serious environmental pollution. At the same time, sodium hypochlorite is generated by the reaction of alkaline solution and chlorine at low temperature, and sodium hypochlorite crystals in the packing will continuously precipitate as the temperature decreases. Sodium hypochlorite has oxidizing properties and has certain corrosiveness to equipment and pipelines.

[0003] Therefore, there is an urgent need for a new technical solution in the prior art to solve this problem. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: to provide a chlorine absorption and neutralization device applicable to chlorine electrowinning cobalt production in a low-temperature environment to solve the technical problems that alkaline solution and generated sodium hypochlorite are both prone to crystal precipitation in a low-temperature environment, causing blockage or corrosion of the device, resulting in a significant decrease in the absorption efficiency of chlorine-containing waste gas and serious environmental pollution.

[0005] A chlorine absorption and neutralization device applicable to chlorine electrowinning cobalt production in a low-temperature environment includes a chlorine absorption tower, an electrowinning tank, a chlorine absorption hood, and an alkaline solution circulation tank. The inlet end of the chlorine absorption hood is fixedly connected to the electrowinning tank, and the outlet end of the chlorine absorption hood is fixedly connected to the chlorine inlet at the lower part of the side wall of the chlorine absorption tower through a chlorine absorption pipeline. At least one alkaline solution inlet is arranged at the upper part of the side wall of the chlorine absorption tower, and an alkaline solution outlet is arranged at the bottom of the side wall of the chlorine absorption tower. The inlet of the alkaline solution circulation tank is connected to the alkaline solution outlet, and the outlet of the alkaline solution circulation tank is connected to the alkaline solution inlet. The alkaline solution inlet is connected to an alkaline solution delivery pipe inside the chlorine absorption tower. At least one spray head is arranged on the alkaline solution delivery pipe. At least one steam inlet is arranged on the side wall of the chlorine absorption tower. The outside of the steam inlet is connected to a steam generating device and a steam valve, and the steam inlet is located below the chlorine inlet.

[0006] A chlorine absorption and neutralization device applicable to chlorine electrowinning cobalt production in a low-temperature environment further includes an alkaline solution intermediate tank; the alkaline solution intermediate tank is connected between the alkaline solution outlet and the inlet of the alkaline solution circulation tank for depositing crystals.

[0007] The inlet position of the intermediate caustic liquor tank is lower than the outlet position.

[0008] A heating pipeline is arranged in the caustic liquor circulation tank;

[0009] Steam is introduced into the heating pipeline.

[0010] Through the above design scheme, the utility model can bring the following beneficial effects:

[0011] In the utility model, a steam inlet is opened on the side wall of the original chlorine absorption tower, so that the steam fills the entire chlorine absorption tower. The heat of the steam is used to warm the sprayed caustic liquor and the inside of the chlorine absorption tower, effectively avoiding the easy precipitation of crystals from the caustic liquor. In addition, an intermediate caustic liquor tank is provided, and a small amount of crystals flowing out of the chlorine absorption tower are deposited here. Since the inlet position of the intermediate caustic liquor tank is lower than the outlet position, the crystals can be effectively deposited and will not enter the caustic liquor circulation tank. A heating pipeline is added to the caustic liquor circulation tank, and liquids such as steam or hot water can be introduced into the heating pipeline to warm the caustic liquor and adjust the pH value, and then the caustic liquor is circulated and sent back to the chlorine absorption tower, ensuring that the chlorine in the chlorine-containing waste gas can still be absorbed in cold regions such as the north, and minimizing the precipitation of crystals from the caustic liquor and the generation of sodium hypochlorite to the greatest extent.

[0012] The utility model effectively solves the problem of low chlorine absorption rate of the outdoor chlorine absorption device in cold regions. It has strong operability and low cost. The whole process can continuously absorb chlorine, ensure stable gas indexes, and have no pollution discharge. Description of the Drawings

[0013] The following further explains the utility model in conjunction with the drawings and specific embodiments:

[0014] Figure 1 It is a structural block diagram of a chlorine absorption and neutralization device for the production of electrowinning cobalt applicable to low-temperature environments in the utility model;

[0015] Figure 2 It is a structural schematic diagram of a chlorine absorption tower in a chlorine absorption and neutralization device for the production of electrowinning cobalt applicable to low-temperature environments in the utility model;

[0016] Figure 3 It is a structural schematic diagram of an intermediate caustic liquor tank in a chlorine absorption and neutralization device for the production of electrowinning cobalt applicable to low-temperature environments in the utility model;

[0017] Figure 4 It is a structural schematic diagram of a caustic liquor circulation tank in a chlorine absorption and neutralization device for the production of electrowinning cobalt applicable to low-temperature environments in the utility model.

[0018] In the figure, 1 - chlorine absorption tower, 2 - electrowinning cell, 3 - chlorine absorption hood, 4 - lye circulation tank, 5 - chlorine absorption pipeline, 6 - steam inlet, 7 - lye intermediate tank, 8 - heating pipeline, 101 - chlorine inlet, 102 - lye inlet, 103 - lye outlet, 104 - lye delivery pipe, 105 - spray head. Specific implementation mode

[0019] As Figure 1 shown, a chlorine absorption and neutralization device for electrowinning cobalt production applicable to low-temperature environments includes a chlorine absorption tower 1, an electrowinning cell 2, a chlorine absorption hood 3, a lye circulation tank 4, and a lye intermediate tank 7. The air inlet end of the chlorine absorption hood 3 is fixedly connected to the electrowinning cell 2, and the air outlet end of the chlorine absorption hood 3 is fixedly connected to the chlorine inlet 101 at the lower part of the side wall of the chlorine absorption tower 1 through the chlorine absorption pipeline 5. At least one lye inlet 102 is arranged on the upper part of the side wall of the chlorine absorption tower 1, and the lye outlet 103 is arranged at the bottom of the side wall of the chlorine absorption tower 1. The inlet of the lye circulation tank 4 is connected to the outlet of the lye intermediate tank 7, the outlet of the lye circulation tank 4 is connected to the lye inlet 102 through a circulation pump, and a heating pipeline 8 is arranged in the lye circulation tank 4. Steam or hot water is introduced into the heating pipeline 8 to keep the lye in the lye circulation tank 4 at 50°C to 60°C. The inlet of the lye intermediate tank 7 is connected to the lye outlet 103, and the inlet position of the lye intermediate tank 7 is lower than the outlet position for depositing crystals.

[0020] The lye inlet 102 is connected to the lye delivery pipe 104 inside the chlorine absorption tower 1; at least one spray head 105 is arranged on the lye delivery pipe 104; a steam inlet 6 is arranged on the side wall of the chlorine absorption tower 1; the outside of the steam inlet 6 is connected to a steam generating device and a steam valve, and the steam inlet 6 is located below the chlorine inlet 101.

[0021] A method for absorbing and neutralizing chlorine using the device includes the following steps, which are carried out in sequence as follows:

[0022] a. Configure lye with a concentration of 9% to 11% in the lye circulation tank 4, use the heating pipeline 8 to raise the temperature of the lye to 50°C to 60°C, and then pump it into the chlorine absorption tower 1 from the lye inlet 102 through a circulation pump. The lye enters the packing through the spray head 105 until the lye liquid level at the bottom of the chlorine absorption tower 1 reaches the requirement. Steam is introduced into the chlorine absorption tower 1 through the steam inlet 6. During the process of introducing steam, measure the pressure of the chlorine absorption tower 1. If it exceeds the set maximum value, stop introducing; if it is lower than the set minimum value, continue to introduce.

[0023] b. Turn on the fan on the chlorine absorption hood 3 to send the chlorine in the electrowinning cell 2 into the chlorine absorption tower 1, and control the flow rate of the chlorine to be 4m 3 / h to 5m 3 / h. After the chlorine gas reacts with and is absorbed by the lye through the packing, and the gas is tested and qualified, it is discharged into the atmosphere.

[0024] c. The lye after reacting with the chlorine gas flows back to the intermediate lye tank 7 through the lye outlet 103. In the intermediate lye tank 7, after the precipitated crystals are deposited, the liquid enters the lye circulation tank 4. In the lye circulation tank 4, the lye concentration is detected every 4 hours. When the lye concentration is lower than 5%, a part of it is pumped into the waste liquid tank for the preliminary treatment of the industrial wastewater in the factory area.

[0025] d. Another part of the lye is added with 30% lye in proportion and reconfigured into lye with a concentration of 9% - 11%. After the temperature rises to 50°C - 60°C through the heating pipeline 8, the processes of steps a - d are cycled again.

Claims

1. An apparatus for chlorine absorption and neutralization in the production of electrowinning cobalt applicable to low-temperature environments, comprising a chlorine absorption tower (1), an electrowinning cell (2), a chlorine absorption hood (3), and an alkali solution circulation tank (4). The intake end of the chlorine absorption hood (3) is fixedly connected to the electrowinning cell (2), and the outlet end of the chlorine absorption hood (3) is fixedly connected to a chlorine inlet (101) at the lower part of the side wall of the chlorine absorption tower (1) through a chlorine absorption pipeline (5). At least one alkali solution inlet (102) is provided at the upper part of the side wall of the chlorine absorption tower (1), and an alkali solution outlet (103) is provided at the bottom of the side wall of the chlorine absorption tower (1). The inlet of the alkali solution circulation tank (4) is connected to the alkali solution outlet (103), and the outlet of the alkali solution circulation tank (4) is connected to the alkali solution inlet (102). The alkali solution inlet (102) is connected to an alkali solution delivery pipe (104) inside the chlorine absorption tower (1). At least one spray head (105) is provided on the alkali solution delivery pipe (104); characterized in that: A steam inlet (6) is provided on the side wall of the chlorine absorption tower (1); the outside of the steam inlet (6) is connected to a steam generating device and a steam valve, and the steam inlet (6) is located below the chlorine inlet (101).

2. The chlorine absorption and neutralization device for electrowinning cobalt production applicable to low-temperature environments according to claim 1, characterized in that: It further includes an intermediate caustic solution tank (7); the intermediate caustic solution tank (7) is connected between the caustic solution outlet (103) and the inlet of the caustic solution circulation tank (4) for depositing crystals.

3. The chlorine gas absorption and neutralization device for electrowinning cobalt production applicable to low-temperature environments according to claim 2, characterized in that: The inlet position of the intermediate caustic solution tank (7) is lower than the outlet position.

4. The chlorine absorption and neutralization device for electrowinning cobalt production applicable to low-temperature environments according to claim 1, characterized in that: A heating pipeline (8) is arranged in the caustic solution circulation tank (4).

5. The chlorine absorption and neutralization device applicable to electrowinning cobalt production in a low-temperature environment according to claim 4, characterized in that: Steam is introduced into the heating pipeline (8).

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