An environmentally friendly cooling system and control method during gold desorption

Abstract

The present invention is an environmentally friendly cooling system and control method during the gold desorption process. The environmentally friendly cooling system during the gold desorption process includes an electrolytic cell, a circulating pump, a desorption liquid tank, a circulating water tank, a desorption column, an air compressor, and connecting pipes and control valves of the above components; it also includes a low-temperature coolant circulation device, a low-temperature water supply channel, a low-temperature drainage channel, a cold air refrigeration device, a cold air intake channel and a cold air exhaust channel. The present invention also designs a system control method for the above-mentioned improvements. The present invention realizes rapid environmentally friendly cooling during the gold desorption process through the low-temperature coolant circulation device and the cold air refrigeration device, prevents the volatilization of harmful gases, facilitates the condensation recovery of heavy metals during the desorption process, and prevents the formation of a smoky environment due to the temperature difference between the internal temperature of the electrolytic cell and the indoor temperature, thereby reducing the production cycle and improving the production environment.

Description

Technical Field

[0001] The present invention relates to the technical field of gold desorption, and in particular to an environmentally friendly cooling system and a control method in a gold desorption process. Background Art

[0002] The existing cooling process in the gold desorption process usually uses a circulating solution at natural temperature to cool the electrolytic cell. Due to the high temperature and high pressure desorption process, in order to ensure the temperature of the desorption process, the equipment and pipelines usually use insulation materials. The natural temperature solution is used to cool the electrolytic cell, and the cooling speed is slow. At the same time, after cooling to a certain temperature, it is difficult to effectively reduce the temperature of the electrolytic cell due to the power consumption of the equipment circulating the natural temperature solution. The relatively high electrolytic cell solution temperature is also prone to the volatilization of harmful gases, and it is easy to generate smoke when opening the electrolytic cell, which is not conducive to the operation of subsequent operators, affecting the working environment, reducing work efficiency, and prolonging the desorption cycle. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an environmentally friendly cooling system and a control method during the gold desorption process.

[0004] The technical solution adopted by the present invention is:

[0005] An environmentally friendly cooling system for gold desorption process, comprising an electrolytic cell, a circulating pump, a desorption liquid tank, a circulating water tank, a desorption column, an air compressor, and connecting pipes and control valves of the above components; the environmentally friendly cooling system for gold desorption process also comprises a low-temperature cooling liquid circulation device, a low-temperature water supply channel, a low-temperature drainage channel, a cold air refrigeration device, a cold air intake channel and a cold air exhaust channel; one end of the low-temperature cooling liquid circulation device is connected to the bottom of the circulating water tank through a low-temperature water supply channel, and the other end is connected to the electrolytic cell liquid inlet pipe through a low-temperature water supply channel, and the low-temperature water supply channel is close to the circulating water tank. A low-temperature water supply valve is provided at the water tank, and a low-temperature water inlet valve is provided near the liquid inlet pipe of the electrolytic cell; one end of the low-temperature drainage channel is connected to the liquid outlet pipe of the electrolytic cell, and the other end is connected to the bottom of the circulating water tank, on which a low-temperature drainage valve is provided; one end of the cold air inlet channel is connected to the cold air refrigeration equipment, and the other end is connected to the cold air inlet port of the electrolytic cell, the cold air inlet port is opened above the electrolytic cell, and a cold air inlet valve is provided thereon; one end of the cold air exhaust channel is connected to the cold air exhaust port of the electrolytic cell, and the other end is connected to the desorption liquid tank, the cold air exhaust port is opened below the electrolytic cell, and a cold air exhaust valve is provided thereon.

[0006] Preferably, a liquid check valve is provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the liquid inlet pipeline of the electrolytic cell.

[0007] Preferably, a flow meter is provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the liquid inlet pipeline of the electrolytic cell, and the flow meter is located between the liquid check valve and the low-temperature water inlet valve.

[0008] Preferably, a temperature control gauge and a pressure gauge are provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the liquid inlet pipeline of the electrolytic cell.

[0009] Preferably, a temperature gauge is also provided on the cold air exhaust passage.

[0010] A control method, using the environmentally friendly cooling system in the gold desorption process, includes the following steps: Step 1, close the desorption inlet valve, the electrolysis inlet valve, and the electrolysis outlet valve, open the drain valve, discharge the high-temperature desorption liquid to the circulating water tank, after the desorption liquid is discharged, close the drain valve, open the front valve of the replenishment pump and the replenishment valve, start the replenishment circulation pump for cooling and water replenishment, after the water replenishment is completed, stop the replenishment circulation pump, close the front valve of the replenishment pump and the replenishment valve, open the desorption inlet valve, the electrolysis inlet valve, and the electrolysis outlet valve, start the circulation pump, circulate the solution of natural temperature to cool the electrolytic cell, and after the temperature of the electrolytic cell solution drops to below the normal pressure boiling point, open the pressure reducing valve to electrolyze The tank is depressurized; step two, stop the circulation pump, close the valve before the pump and the filter valve, open the low-temperature water supply valve, the low-temperature water inlet valve, and the low-temperature drain valve, start the low-temperature coolant circulation equipment, and circulate the low-temperature water to cool the electrolytic cell again; step three, start the cold air refrigeration equipment at the same time, open the cold air inlet valve and the cold air exhaust valve to cool down; step four, when the temperature of the electrolytic cell solution drops below the daily indoor temperature, stop the low-temperature coolant circulation equipment, close the low-temperature water supply valve, the low-temperature water inlet valve, and the low-temperature drain valve; step five, after closing the low-temperature coolant circulation equipment for 10 to 30 minutes, turn off the cold air refrigeration equipment, close the cold air inlet valve and the cold air exhaust valve, and the cooling is completed.

[0011] The beneficial effects of the present invention are:

[0012] The core of the present invention is to establish a control process that inhibits the volatilization of harmful gases during gold desorption, facilitates the collection of harmful gases and quickly cools them down, mainly by adding necessary hardware to the process and designing a new process model.

[0013] Aiming at the existing problems of the cooling process control technology in the gold desorption process, the present invention has designed a new environmentally friendly cooling process control technology in the gold desorption process after research. The new process solves the problems of slow cooling speed in the gold desorption process, difficulty in controlling the cooling temperature below the production room environment, and volatilization of harmful gases when the electrolytic cell is shut down to unload the gold mud. The new method realizes rapid cooling in the gold desorption process through low-temperature coolant circulation equipment and cold air refrigeration equipment, ensures the equipment temperature when the electrolytic cell is opened to unload the gold mud, prevents the volatilization of harmful gases, and effectively prevents the formation of a smoky environment due to the temperature difference between the internal temperature of the electrolytic cell and the indoor temperature, reduces the production cycle, and improves the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of the cooling system in the traditional gold desorption process;

[0015] Figure 2 This is a flow chart of the cooling system in the gold desorption process of the present invention.

[0016] Figure 1 —2, 1—electrolyzer, 2—circulation pump, 3—desorption liquid tank, 4—circulation water tank, 5—desorption column, 6—air compressor, 7—low-temperature coolant circulation equipment, 8—low-temperature water supply channel, 9—low-temperature drainage channel, 10—cold air refrigeration equipment, 11—cold air intake channel, 12—cold air exhaust channel, 13—electrolyzer liquid inlet pipeline, 14—low-temperature water supply valve, 15—low-temperature water inlet valve, 16—low-temperature drainage valve, 17— Cold air inlet valve, 18-cold air exhaust valve, 19-liquid check valve, 20-flow meter, 21-temperature control meter, 22-pressure gauge, 23-temperature gauge, 24-desorption liquid inlet valve, 25-electrolysis liquid inlet valve, 26-electrolysis liquid outlet valve, 27-drain valve, 28-liquid replenishment pump front valve, 29-liquid replenishment valve, 30-liquid replenishment circulation pump, 31-pressure reducing valve, 32-pump front valve, 33-filter valve, 34-electrolyzer liquid outlet pipeline. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1As shown, the conventional cooling system in the gold desorption process includes an electrolytic cell 1, a circulating pump 2, a desorption liquid tank 3, a circulating water tank 4, a desorption column 5, an air compressor 6, and connecting pipes and control valves of the above components. The conventional cooling system in the gold desorption process has a slow cooling speed during the gold desorption process, and the cooling temperature is difficult to be controlled below the indoor environment of the production room, resulting in the volatilization of harmful gases when the electrolytic cell 1 is shut down to unload the gold mud.

[0019] Based on the cooling system in the traditional gold desorption process, such as Figure 2 As shown, the environmentally friendly cooling system during the gold desorption process designed by the present invention also includes a low-temperature cooling liquid circulation device 7, a low-temperature water supply channel 8, a low-temperature drainage channel 9, a cold air refrigeration device 10, a cold air intake channel 11 and a cold air exhaust channel 12. One end of the low-temperature cooling liquid circulation device 7 is connected to the bottom of the circulating water tank 4 through the low-temperature water supply channel 8, and the other end is connected to the electrolytic cell liquid inlet pipeline 13 through the low-temperature water supply channel 8. The low-temperature water supply channel 8 is provided with a low-temperature water supply valve 14 near the circulating water tank 4, and a low-temperature water inlet valve 15 near the electrolytic cell liquid inlet pipeline 13. One end of the low-temperature drainage channel 9 is connected to the electrolytic cell liquid outlet pipeline 34, and the other end is connected to the bottom of the circulating water tank 4, and a low-temperature drainage valve 16 is provided on it. One end of the cold air intake channel 11 is connected to the cold air refrigeration device 10, and the other end is connected to the cold air inlet of the electrolytic cell 1. The cold air inlet of the electrolytic cell 1 is opened above the electrolytic cell 1, and a cold air intake valve 17 is provided on it. One end of the cold air exhaust channel 12 is connected to the cold air exhaust port of the electrolytic cell 1 , and the other end is connected to the desorption liquid tank 3 . The cold air exhaust port of the electrolytic cell 1 is opened below the electrolytic cell 1 . A cold air exhaust valve 18 is provided on the cold air exhaust channel 12 .

[0020] The principle of the environmentally friendly cooling system during the gold desorption process is to use the low-temperature coolant circulation device 7 and the cold air refrigeration device 10 to achieve rapid cooling during the gold desorption process. The entire gold desorption and electrowinning gold collection system usually uses insulation materials, and the cooling speed is slow. At the same time, after cooling to a certain temperature, it is difficult to effectively reduce the temperature of the electrolytic cell 1 due to the power consumption of the solution at the natural temperature circulated by the equipment, so the low-temperature coolant and the cold air refrigeration device 10 must be used to effectively and fully cool down. When the temperature of the solution in the electrolytic cell 1 is lowered to below the normal indoor temperature by using the low-temperature coolant, the low-temperature coolant circulation device 7 is stopped, and the cold air refrigeration device 10 is continued to be used to fully discharge the harmful gases generated during the electrolysis process. The cold air inlet of the electrolytic cell 1 is opened above the electrolytic cell 1, and the cold air exhaust port is opened below the electrolytic cell 1, so that the heavy metals in the harmful gases in the high-temperature desorption process are condensed and dropped to the bottom of the electrolytic cell 1, making full use of the cylindrical side-placed mode of the entire electrolytic cell 1. During the condensation and descent of the heavy metals, they are concentrated on the lowest arc bottom surface inside the electrolytic cell 1, which is convenient for unified recycling and treatment after the electrolytic cell 1 is opened. At the same time, the cold air refrigeration device 10 is used to control the temperature difference between the internal temperature of the electrolytic cell 1 and the production environment temperature to be 3°C to 8°C. When the electrolytic cell 1 is opened, the smoke effect caused by the temperature difference and the pungent smell generated during the desorption process are eliminated, and the environmental protection cooling and controllability and rapidity of the cooling during the high-temperature desorption process are achieved.

[0021] On the basis of the above technical solution, in order to ensure the flow direction of the low-temperature coolant in the low-temperature water supply channel 8 connected to the low-temperature coolant circulation device 7 and the electrolytic cell liquid inlet pipe 13, a liquid check valve 19 is provided on the low-temperature water supply channel 8 connected to the low-temperature coolant circulation device 7 and the electrolytic cell liquid inlet pipe 13.

[0022] In addition, in order to facilitate the operator of the environmental cooling system to check the flow, temperature and pressure of the low-temperature water supply channel 8 at any time during the gold desorption process, the low-temperature water supply channel 8 connected to the electrolytic cell liquid inlet pipe 13 by the low-temperature cooling liquid circulation device 7 is also provided with a flow meter 20, and the flow meter 20 is located between the liquid check valve 19 and the low-temperature water inlet valve 15. The low-temperature water supply channel 8 connected to the electrolytic cell liquid inlet pipe 13 by the low-temperature cooling liquid circulation device 7 is also provided with a temperature control meter 21 and a pressure meter 22. At the same time, a temperature meter 23 can also be added to the cold air exhaust channel 12 to facilitate checking the temperature of the cold air exhaust channel 12.

[0023] After the environmentally friendly cooling system in the gold desorption process is added with a low-temperature coolant circulation device 7, a low-temperature water supply channel 8, a low-temperature drainage channel 9, a cold air refrigeration device 10, a cold air intake channel 11 and a cold air exhaust channel 12, its control method is carried out according to the following steps:

[0024] Step 1, close the desorption inlet valve 24, the electrolysis inlet valve 25, and the electrolysis outlet valve 26, open the drain valve 27, and discharge the high-temperature desorption liquid to the circulating water tank 4. After the desorption liquid is discharged, close the drain valve 27, open the front valve 28 and the replenishment valve 29 of the replenishment pump, and start the replenishment circulation pump 30 for cooling and water replenishment. After the water replenishment is completed, stop the replenishment circulation pump 30, close the front valve 28 and the replenishment valve 29 of the replenishment pump, open the desorption inlet valve 24, the electrolysis inlet valve 25, and the electrolysis outlet valve 26, start the circulation pump 2, circulate the solution of natural temperature to cool the electrolytic cell 1, and after the temperature of the solution in the electrolytic cell 1 drops to below the boiling point at normal pressure, open the pressure reducing valve 31 to relieve the pressure of the electrolytic cell 1. The function of step one is that the existing gold-loaded carbon desorption process is carried out at a high temperature of 150°C and an air pressure of more than 0.5Mpa. First, close the desorption liquid inlet valve 24, the electrolysis liquid inlet valve 25, and the electrolysis liquid outlet valve 26 to keep the internal air pressure and temperature of the electrolytic cell 1 stable, and discharge the high-temperature electrolytic solution in the desorption column 5 to facilitate rapid cooling. After the high-temperature electrolytic solution is discharged, water is replenished to cool the gold-loaded carbon in the desorption column, and then the aqueous solution in the circulating desorption column 5 is used to gradually cool the electrolytic cell. In order to avoid the collision of cold and hot water, the violent reaction causes the gold mud originally deposited by electrolysis to roll, and the water replenishment in the desorption column is affected by the residual heat of the gold-loaded carbon in the desorption column 5, and there is a certain temperature, which can achieve gradual cooling. The water replenishment is replenished from the bottom of the desorption column 5 to the top of the desorption column 5, which can achieve the temperature height of the aqueous solution that first enters the electrolytic cell 1 for cooling and then enters the electrolytic cell 1, achieving gradual cooling, avoiding the rolling of the gold mud in the electrolytic cell, and causing the loss of precious metals due to rolling and floating. In order to ensure that the solution inside the entire electrolytic cell is in a stable state during the entire process of cooling from 150°C to the normal pressure boiling point, the pressure reducing valve 31 can be opened to relieve the pressure of the electrolytic cell 1 only after the temperature of the solution in the electrolytic cell 1 drops below the normal pressure boiling point. Gradual cooling also avoids the sudden change of temperature of the equipment and prolongs the service life of the equipment.

[0025] Step 2, stop the circulation pump 2, close the pump front valve 32, the filter valve 33, open the low-temperature water supply valve 14, the low-temperature water inlet valve 15, the low-temperature drain valve 16, start the low-temperature coolant circulation device 7, and circulate the low-temperature water to cool the electrolytic cell 1 again. The purpose of step 2 is: when the temperature of the solution in the electrolytic cell 1 drops below the normal pressure boiling point, because the entire equipment uses insulation materials, and the aqueous solution in the circulating desorption column 5 itself generates power consumption, the original aqueous solution can no longer be quickly and effectively cooled, so stop the circulation pump 2, close the pump front valve 32, the filter valve 33, open the low-temperature water supply valve 14, the low-temperature water inlet valve 15, the low-temperature drain valve 16, start the low-temperature coolant circulation device 7, start the low-temperature coolant circulation device 7, and circulate the low-temperature water to cool the electrolytic cell 1 again.

[0026] Step three, start the cold air refrigeration equipment 10 at the same time, open the cold air intake valve 17 and the cold air exhaust valve 18, and cool down. The purpose of step three is to start the cold air refrigeration equipment 10 at the same time in order to speed up the cooling. While speeding up the cooling, it is also beneficial to discharge the harmful gases generated in the electrolysis process, and at the same time condense and recover the heavy metals such as mercury inside the upper part of the electrolytic cell 1, and also avoid the heavy metals such as mercury vapor adhering to the corresponding pipes due to pressure loss and temperature loss. The cold air intake port of the electrolytic cell 1 is opened above the electrolytic cell 1, and the cold air exhaust port is opened below the electrolytic cell 1, so that the heavy metals in the harmful gases in the high-temperature desorption process are condensed and dropped to the bottom of the electrolytic cell 1, making full use of the cylindrical side-placed mode of the entire electrolytic cell 1. During the condensation and descent of the heavy metals, they are concentrated on the lowest arc bottom surface inside the electrolytic cell 1, which is convenient for unified recovery and treatment after the electrolytic cell 1 is opened.

[0027] Step 4: When the temperature of the solution in the electrolytic cell 1 drops below the normal indoor temperature, the low-temperature coolant circulation device 7 is stopped, and the low-temperature water supply valve 14, the low-temperature water inlet valve 15, and the low-temperature drain valve 16 are closed.

[0028] Step 5: Turn off the low-temperature coolant circulation device 7. After 10 to 30 minutes, turn off the cold air refrigeration device 10, close the cold air intake valve 17 and the cold air exhaust valve 18, and the cooling is complete. Turn off the low-temperature coolant circulation device, keep the cold air refrigeration device 10 running for 10 to 30 minutes, fully discharge the gas generated in the electrolytic cell 1 due to the alternating cooling process of hot and cold, control the temperature difference between the internal temperature of the electrolytic cell 1 and the production environment temperature to be 3°C to 8°C, and when opening the electrolytic cell 1, eliminate the smoke effect caused by the temperature difference and the pungent smell generated during the desorption process.

[0029] It should be noted that the cooling medium of the environmentally friendly cooling system during the gold desorption process can be low-temperature water or low-temperature coolant. The low-temperature coolant circulation equipment can be a cooling circulation pump or other similar commercially available products; the air conditioning refrigeration equipment can be a cold air blower, a compressor or other similar commercially available products.

Claims

1. An environmentally friendly cooling system during gold desorption, comprising an electrolytic cell, a circulating pump, a desorption liquid tank, a circulating water tank, a desorption column, an air compressor, and connecting pipes and control valves of the above components; characterized in that: The environmentally friendly cooling system during the gold desorption process also includes a low-temperature coolant circulation device, a low-temperature water supply channel, a low-temperature drainage channel, a cold air refrigeration device, a cold air intake channel and a cold air exhaust channel; One end of the low-temperature coolant circulation device is connected to the bottom of the circulating water tank through a low-temperature water supply channel, and the other end is connected to the liquid inlet pipe of the electrolytic cell through a low-temperature water supply channel. A low-temperature water supply valve is provided at the low-temperature water supply channel near the circulating water tank, and a low-temperature water inlet valve is provided near the liquid inlet pipe of the electrolytic cell; one end of the low-temperature drainage channel is connected to the liquid outlet pipe of the electrolytic cell, and the other end is connected to the bottom of the circulating water tank, on which a low-temperature drainage valve is provided; one end of the cold air inlet channel is connected to the cold air refrigeration device, and the other end is connected to the cold air inlet port of the electrolytic cell, the cold air inlet port is arranged above the electrolytic cell, and a cold air inlet valve is arranged thereon; one end of the cold air exhaust channel is connected to the cold air exhaust port of the electrolytic cell, and the other end is connected to the desorption liquid tank, the cold air exhaust port is arranged below the electrolytic cell, and a cold air exhaust valve is arranged thereon; A liquid check valve is provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the electrolytic cell liquid inlet pipeline; a temperature control meter and a pressure gauge are provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the electrolytic cell liquid inlet pipeline.

2. The environmentally friendly cooling system during gold desorption process according to claim 1, characterized in that: A flow meter is provided on the low-temperature water supply channel of the low-temperature coolant circulation device connected to the electrolytic cell liquid inlet pipeline, and the flow meter is located between the liquid check valve and the low-temperature water inlet valve.

3. The environmentally friendly cooling system during gold desorption according to claim 1, characterized in that: A temperature gauge is also provided on the cold air exhaust passage.

4. A control method, using the environmentally friendly cooling system during gold desorption according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, close the desorption inlet valve, the electrolysis inlet valve, and the electrolysis outlet valve, open the drain valve, discharge the high-temperature desorption liquid to the circulating water tank, after the desorption liquid is discharged, close the drain valve, open the front valve of the refilling pump and the refilling valve, start the refilling circulation pump for cooling and water replenishment, after the water replenishment is completed, stop the refilling circulation pump, close the front valve of the refilling pump and the refilling valve, open the desorption inlet valve, the electrolysis inlet valve, and the electrolysis outlet valve, start the circulation pump, circulate the solution of natural temperature to cool the electrolytic cell, and after the temperature of the electrolytic cell solution drops to a temperature lower than the boiling point at normal pressure, open the pressure reducing valve to relieve the pressure of the electrolytic cell; Step 2: stop the circulation pump, close the pump front valve and filter valve, open the low-temperature water supply valve, low-temperature water inlet valve, and low-temperature drain valve, start the low-temperature coolant circulation equipment, and circulate the low-temperature water to cool the electrolytic cell again; Step 3: Start the air conditioning refrigeration equipment at the same time, open the air conditioning inlet valve and the air conditioning exhaust valve to cool down; Step 4: When the temperature of the electrolytic cell solution drops below the normal indoor temperature, stop the low-temperature coolant circulation equipment, and close the low-temperature water supply valve, low-temperature water inlet valve, and low-temperature drain valve; Step 5. After turning off the low-temperature coolant circulation equipment for 10 to 30 minutes, turn off the air conditioning refrigeration equipment, close the air conditioning air inlet valve and air conditioning exhaust valve, and the cooling is completed.

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