Acid leaching system and method for reducing copper content of copper electrolysis anode slime

Abstract

The invention discloses an acid leaching system and method for reducing the copper content of copper electrolysis anode slime in the technical field of copper electrolysis refining, and the acid leaching system comprises a leaching reaction unit which is used for anode slime slurrying to form anode slime slurry with a preset solid-liquid ratio and preset acidity and blast oxidation leaching reaction of the anode slime slurry. According to the oxidation-reduction potential monitored in real time, the supply flow of the oxidizing gas is dynamically adjusted, then the main oxidation stage of the blast oxidation leaching process is kept in the initial stage of the reaction, it is ensured that the anode mud slurry is always in the ideal reaction environment, efficient leaching of the copper element is achieved, and the leaching efficiency is improved. And when the oxidation-reduction potential is continuously higher than a preset threshold value within a preset time period, reducing the flow of the oxidizing gas, switching to an oxygen maintaining and heat preservation stage, and dynamically adjusting the input quantity of the oxidizing gas so as to achieve the optimal reaction equilibrium state, improve the leaching efficiency, reduce the overall input of the oxidizing gas and reduce the heat loss.

Description

Technical Field

[0001] This invention relates to the field of copper electrolytic refining technology, specifically to an acid leaching system and method for reducing the copper content in copper electrolytic anode mud. Background Technology

[0002] In the copper electrolytic refining process, a large amount of copper-containing anode mud is generated. As an important byproduct of copper electrolytic refining, anode mud is rich in precious metals such as gold, silver, platinum, and palladium, as well as valuable metals such as copper, lead, and bismuth. The copper content of anode mud from domestic copper mines is generally controlled at 10%-16%, while the copper content of anode mud from recycled copper mines often exceeds 20% due to the enrichment of impurities (zinc, iron, lead) in the raw materials. The single acid dissolution method has limited efficiency and cannot effectively separate the copper powder, resulting in a persistently high copper content in the anode mud. This affects the direct copper recovery rate and causes significant economic losses during sales due to copper pricing coefficient issues.

[0003] The existing anode mud uses a single acid dissolution method, which results in low copper separation efficiency, difficulty in effectively reducing copper content, reduced copper recovery rate, and increased difficulty and cost of subsequent treatment. Summary of the Invention

[0004] The purpose of this invention is to provide an acid leaching system and method for reducing the copper content in copper electrolysis anode mud, in order to solve the problems mentioned above, which are caused by the use of a single acid dissolution method, resulting in low copper separation efficiency in anode mud, difficulty in effectively reducing copper content, reduced copper recovery rate, and increased difficulty and cost of subsequent processing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides an acid leaching system for reducing the copper content in copper electrolytic anode mud, comprising:

[0007] The leaching reaction unit is used for preparing anode mud into anode mud slurry with a preset solid-liquid ratio and preset acidity, and for the forced-air oxidation leaching reaction of the anode mud slurry.

[0008] A multi-parameter real-time sensing unit is built into the leaching reaction unit. The multi-parameter real-time sensing unit is used to monitor the solid-liquid ratio, redox potential, acidity and temperature of the anode mud in real time online and generate control signals.

[0009] An intelligent control unit is electrically connected to a multi-parameter real-time sensing unit. The intelligent control unit receives control signals and outputs adjustment signals.

[0010] A dynamic execution unit is electrically connected to an intelligent control unit and is installed on the leaching reaction unit. The dynamic execution unit receives and executes the anode mud slurry preparation and the blower oxidation leaching reaction of the anode mud slurry in the leaching reaction unit according to the control signal, so as to obtain low copper anode mud and copper-rich leachate.

[0011] As a further aspect of the present invention: the leaching reaction unit includes a leaching tank with a built-in mechanical stirrer, a slurry tube, a steam coil, and an oxidizing gas distributor;

[0012] The leaching tank is used for preparing anode mud into a slurry with a preset solid-liquid ratio and preset acidity, and for the blast oxidation leaching reaction of the anode mud slurry. The mechanical agitator is used for stirring the anode mud during slurry preparation and the blast oxidation leaching process. The slurry tube is used for introducing the slurry fluid. The steam coil is used for introducing steam at a preset temperature. The oxidation gas distributor is used for introducing oxidation gas. The mechanical agitator is electrically connected to the dynamic execution unit.

[0013] As a further aspect of the present invention: the multi-parameter real-time sensing unit includes a redox potential sensor, an online acidity analyzer, a temperature sensor, an online viscometer, and an online density meter;

[0014] The redox potential sensor, online acidity analyzer, temperature sensor, online viscometer, and online densitometer are all built into the leaching tank. The redox potential sensor is used to monitor the redox potential of the anode mud in real time and generate a potential signal. The online acidity analyzer is used to monitor the free acid concentration of the anode mud in real time and generate an acidity electrical signal. The temperature sensor is used to monitor the temperature of the anode mud in real time and generate a temperature electrical signal. The online viscometer is used to monitor the viscosity of the anode mud in real time and generate a viscosity electrical signal. The online densitometer is used to monitor the density of the anode mud in real time and generate a density electrical signal.

[0015] Potential signals, acidity signals, temperature signals, viscosity signals, and density signals form control signals.

[0016] As a further aspect of the present invention: the intelligent control unit includes a pulping control model, a temperature control model, and an oxidation control model;

[0017] The pulping control model receives viscosity and density electrical signals. The model includes a preset liquid-solid ratio-viscosity-density correspondence database. The model outputs a start signal to control the mechanical stirrer and a pulping signal to control the introduction of pulping fluid through the pulping pipe. The model compares the viscosity and density electrical signals with the liquid-solid ratio-viscosity-density correspondence database and outputs a stop signal to stop the introduction of pulping fluid through the pulping pipe based on the viscosity, density, and acidity electrical signals. The start signal, pulping signal, and stop signal form the first-stage signal. The pulping fluid includes water and an acid solution.

[0018] The temperature control model receives temperature electrical signals and outputs a second-stage signal for controlling the steam coil to introduce steam to heat and maintain the anode mud to a preset temperature, and to maintain the uniform rotation of the mechanical agitator.

[0019] The oxidation control model receives a potential signal and outputs an oxidation signal for controlling the oxidation gas distributor to output oxidation gas for the main oxidation stage. When the potential signal is continuously higher than a preset threshold within a preset time period, the oxidation control model outputs an oxygen-maintaining signal for controlling the oxidation gas distributor to output oxidation gas for the oxygen-maintaining and heat-preserving stage. The oxidation signal and the oxygen-maintaining signal form a third-stage signal.

[0020] The first-stage signal, the second-stage signal, and the third-stage signal form the control signal.

[0021] As a further aspect of the present invention: the dynamic execution unit includes a power motor for driving the mechanical stirrer, a steam proportioning valve for regulating steam flow, an oxidation proportioning valve for regulating oxidizing gas fluid, a water flow valve for regulating water, and an acid flow valve for regulating acid solution.

[0022] The motor receives and drives the mechanical stirrer to rotate according to the start signal of the first stage signal. The slurry pipe is connected to the water supply device and the acid supply device. The water flow valve and the acid flow valve control the introduction ratio and introduction amount of water and acid fluid in real time according to the slurry signal and stop signal of the first stage signal, so as to mix the anode mud with water and acid fluid to form an anode mud slurry with a preset solid-liquid ratio and a preset acidity.

[0023] The steam proportional control valve receives and introduces steam into the steam coil according to the second stage signal for heating and maintaining the anode mud material at the preset temperature, and controls the power motor to maintain the uniform rotation of the mechanical agitator.

[0024] The oxidation ratio regulating valve receives and, based on the oxidation signal of the third stage signal, introduces oxidizing gas into the oxidation gas distributor at a first preset gas flow rate. The oxidizing gas and the anode mud undergo an oxidation reaction in the main oxidation stage. When the potential signal is continuously higher than a preset threshold within a preset time period, the oxidation ratio regulating valve, based on the oxygen maintenance signal of the third stage signal, introduces oxidizing gas into the oxidation gas distributor at a second preset gas flow rate. The oxidizing gas and the anode mud undergo an oxidation reaction in the oxygen maintenance and heat preservation stage, resulting in low-copper anode mud and a leachate rich in copper ions. The first preset gas flow rate is greater than the second preset gas flow rate.

[0025] Secondly, the present invention provides an acid leaching method for reducing the copper content in copper electrolytic anode mud, the method comprising:

[0026] The anode mud is fed into the leaching reaction unit and a slurry fluid is introduced. The anode mud and the slurry fluid are stirred to form an anode mud slurry with a preset solid-liquid ratio and a preset acidity.

[0027] Start the supply of heating steam and oxidizing gas and introduce them into the leaching reaction unit so that the anode mud can undergo a forced-air oxidation leaching reaction at a preset temperature;

[0028] The anode mud preparation process and the blower oxidation leaching process are monitored in real time to generate control signals. The control signals are then processed and output as regulation signals.

[0029] The control signal is input to the dynamic execution unit, which controls in real time the amount of slurry fluid introduced, the amount of heating steam introduced, and the amount of oxidizing gas introduced, so that the anode mud obtains an anode mud slurry with a preset solid-liquid ratio in the leaching reaction unit. The anode mud slurry undergoes a forced-air oxidation leaching reaction with oxidizing gas at a preset temperature. Within a preset reaction time, low-copper anode mud and a leachate rich in copper ions are obtained.

[0030] As a further aspect of the present invention: the slurry fluid includes water and an acid solution, and the preset solid-liquid ratio ranges from 3 to 5:1.

[0031] As a further aspect of the present invention: the acid solution is a dilute acid solution obtained from the final copper removal solution of the three-stage purification process of the copper electrolysis system.

[0032] As a further aspect of the present invention, the preset temperature is 82℃~85℃.

[0033] As a further aspect of the present invention: the preset acidity is 350g / L~450g / L.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. In this invention, by creating synergistic leaching conditions of "high temperature, high acid, rich oxygen, and long duration" within the leaching reaction unit, not only can copper powder in the anode mud be effectively dissolved, but the conversion and dissolution of sparingly soluble compounds such as copper oxide and cuprous sulfide can also be significantly promoted. The redox potential sensor in the multi-parameter real-time sensing unit monitors the redox potential of the anode mud slurry in real time. Based on the real-time monitored redox potential, the supply flow rate of oxidizing gas is dynamically adjusted, thereby maintaining the main oxidation stage of the blower oxidation leaching process in the initial stage of the reaction, ensuring that the anode mud slurry is always in an ideal reaction environment, and achieving efficient leaching of copper. The redox potential sensor continuously collects data. When the redox potential is higher than a preset threshold for a preset time period, the flow rate of oxidizing gas is reduced, switching to the oxygen-preserving and heat-maintaining stage, dynamically adjusting the input of oxidizing gas to achieve the optimal reaction equilibrium state, improving leaching efficiency, reducing the overall input of oxidizing gas, and reducing heat loss. While ensuring maximum leaching of copper, it can also save energy input. The system can effectively avoid energy waste, demonstrating good economic and environmental benefits and has broad application prospects.

[0036] 2. In this invention, during the anode mud slurry preparation process, the multi-parameter real-time sensing unit performs online real-time monitoring to ensure that the anode mud and the slurry fluid form an anode mud slurry with a preset solid-liquid ratio and preset acidity in the leaching reaction unit. This ensures that the anode mud slurry undergoes an oxidative leaching reaction under optimal conditions, allowing elemental copper and copper compounds in the anode mud to participate in the reaction more effectively, thereby reducing the overall copper content in the anode mud. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the system connection structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example:

[0041] Please see Figure 1 In this embodiment of the invention, an acid leaching system for reducing the copper content in copper electrolytic anode mud includes:

[0042] Leaching reaction unit 1 is used for preparing anode mud slurry with a preset solid-liquid ratio and preset acidity, and for the forced-air oxidation leaching reaction of the anode mud slurry. The leaching reaction unit includes a leaching tank with a built-in mechanical stirrer, a slurry tube, a steam coil, and an oxidizing gas distributor. The mechanical stirrer is installed in the middle of the leaching tank, and the slurry tube is installed at the upper end of the leaching tank. The outlet end of the slurry tube is located above the stirring part of the leaching tank. The slurry tube is connected to a water supply device and an acid supply device. The slurry tube can simultaneously or separately introduce water and acid solutions. The steam coil is arranged around the inner wall of the leaching tank to provide a constant heating temperature and ensure the stability of the reaction process. The oxidizing gas distributor is evenly distributed at the bottom of the leaching tank, which can effectively release oxidizing gas to promote the full oxidation reaction of the anode mud slurry. At the same time, the oxidizing gas exiting from the bottom can stir the anode mud slurry, achieving a secondary stirring effect.

[0043] Furthermore, the leaching tank is equipped with an external insulation layer to reduce heat loss and improve energy efficiency;

[0044] The leaching tank is used for preparing anode mud into a slurry with a preset solid-liquid ratio and preset acidity, and for the blast oxidation leaching reaction of the anode mud slurry. The mechanical agitator is used for stirring the anode mud during slurry preparation and the blast oxidation leaching process. The slurry tube is used for introducing the slurry fluid. The steam coil is used for introducing steam at a preset temperature. The oxidation gas distributor is used for introducing oxidation gas. The mechanical agitator is electrically connected to the dynamic execution unit 4.

[0045] Multi-parameter real-time sensing unit 2 is built into the leaching reaction unit 1. Multi-parameter real-time sensing unit 2 is used to monitor the solid-liquid ratio, redox potential, acidity and temperature of the anode mud in real time online and generate control signals.

[0046] Specifically, the multi-parameter real-time sensing unit 2 includes a redox potential sensor, an online acidity analyzer, a temperature sensor, an online viscometer, and an online density meter;

[0047] The oxidation-reduction potential sensor, online acidity analyzer, temperature sensor, online viscometer, and online densitometer are all built into the leaching tank. The detection ends of the oxidation-reduction potential sensor, online acidity analyzer, temperature sensor, online viscometer, and online densitometer are all in contact with the anode mud. The oxidation-reduction potential sensor is used to monitor the oxidation-reduction potential of the anode mud in real time and generate a potential signal. The potential signal is used to react to different stages of the blast oxidation leaching reaction, realize the stage control of the introduction of compressed oxidizing gas, and thus realize the switching of the blast oxidation leaching reaction from the main oxidation stage to the oxygen maintenance and heat preservation stage. The online acidity analyzer is used to monitor the free acid concentration of the anode mud in real time and generate an acidity electrical signal. The temperature sensor is used to monitor the temperature of the anode mud in real time and generate a temperature electrical signal. The online viscometer is used to monitor the viscosity of the anode mud in real time and generate a viscosity electrical signal. The online densitometer is used to monitor the density of the anode mud in real time and generate a density electrical signal.

[0048] Potential signals, acidity signals, temperature signals, viscosity signals, and density signals form control signals.

[0049] Intelligent control unit 3 is electrically connected to multi-parameter real-time sensing unit 2. Intelligent control unit 3 receives control signals and outputs regulation signals.

[0050] Dynamic execution unit 4 is electrically connected to intelligent control unit 3. Dynamic execution unit 4 is installed on leaching reaction unit 1. Dynamic execution unit 4 receives and executes the anode mud slurry preparation and the anode mud slurry blast oxidation leaching reaction in leaching reaction unit 1 according to the control signal to obtain low copper anode mud and copper ion rich leachate.

[0051] Specifically, in the leaching reaction unit 1, the present invention uses a multi-parameter real-time sensing unit 2 to monitor the anode mud slurry preparation process online in real time. This ensures that the anode mud and the slurry fluid form an anode mud slurry with a preset solid-liquid ratio and a preset acidity in the leaching reaction unit 1. This ensures that the anode mud slurry undergoes an oxidative leaching reaction under optimal conditions, allowing elemental copper and copper compounds in the anode mud to participate in the reaction more effectively, thereby reducing the overall copper content in the anode mud. The leaching reaction unit 1 forms a synergistic leaching condition of "high temperature, high acid, rich oxygen, and long time," which not only effectively dissolves copper powder in the anode mud but also significantly promotes the conversion and dissolution of insoluble compounds such as copper oxide and cuprous sulfide. The large amount of copper leaching reduces the total amount of anode mud, and the precious metals such as gold and silver are significantly enriched, greatly improving the economic benefits of subsequent precious metal recovery.

[0052] Resource recycling: The dilute acid used in the process comes from the waste acid generated by the electrolysis system itself. The leachate can be returned to the electrolysis system to recover copper, realizing the internal recycling of resources and the reduction of "three wastes", which meets the requirements of green metallurgy and circular economy.

[0053] Steam and oxidizing gas at preset temperatures are introduced through a steam coil and an oxidizing gas distributor, respectively. Control signals monitored by the multi-parameter real-time sensing unit 2 are output as adjustment signals by the intelligent control unit 3 and input to the dynamic execution unit 4. The dynamic execution unit 4 then controls the amount of steam and oxidizing gas introduced. The steam heats the anode mud and maintains it at the preset temperature. The oxidizing gas is introduced and contacts the anode mud, allowing elemental copper or copper compounds to leach under acidic conditions. During the blast oxidation leaching reaction, the oxidation-reduction potential sensor in the multi-parameter real-time sensing unit 2 monitors the oxidation-reduction potential of the anode mud in real time. Based on the real-time monitored oxidation-reduction potential, the oxidation is dynamically adjusted. The gas supply flow rate is adjusted to maintain the main oxidation stage of the blast oxidation leaching process in the initial stage of the reaction, ensuring that the anode mud is always in an ideal reaction environment, achieving efficient leaching of copper. The oxidation-reduction potential sensor continuously collects data. When the oxidation-reduction potential is higher than the preset threshold for a preset time period, the oxidation gas flow rate is reduced, switching to the oxygen-preserving and heat-preserving stage. The input of oxidation gas is dynamically adjusted to achieve the best reaction balance, improve leaching efficiency, reduce the overall input of oxidation gas, and reduce heat loss. While ensuring maximum leaching of copper, it can save energy input. The system can effectively avoid energy waste, showing good economic and environmental benefits and has broad application prospects.

[0054] Furthermore, the oxidizing gas is compressed air or oxygen. In the acid leaching system, the oxidation-reduction potential (ORP) is a crucial indicator of the oxidation and reduction capabilities within the reaction system. By precisely controlling the ORP value range, the leaching process of elemental copper or copper compounds can be effectively guided, ensuring that the conversion occurs under appropriate chemical conditions. When the ORP falls below a preset threshold, it indicates insufficient oxidation capacity in the system. In this stage, a large flow of oxidizing gas is supplied to raise the ORP to the ideal range. Continuous monitoring and adjustment of the ORP allow for precise control of the copper leaching rate, making the entire acid leaching process more efficient and controllable.

[0055] Preferably, the intelligent control unit 3 includes a pulping control model, a temperature control model, and an oxidation control model;

[0056] The pulping control model receives viscosity and density electrical signals. The pulping control model includes a preset liquid-solid ratio-viscosity-density correspondence database. The pulping control model outputs a start signal to control the mechanical stirrer to start and a pulping signal to control the introduction of pulping fluid through the pulping pipe. The pulping control model compares the viscosity and density electrical signals with the liquid-solid ratio-viscosity-density correspondence database and outputs a stop signal to stop the introduction of pulping fluid through the pulping pipe based on the viscosity, density, and acidity electrical signals. The start signal, pulping signal, and stop signal form the first stage signal. The pulping fluid includes water and acid solution.

[0057] Specifically, after receiving viscosity and density electrical signals, the slurry control model converts these signals to obtain the real-time viscosity and density of the anode slurry. The slurry control model has a preset liquid-solid ratio-viscosity-density correspondence database with preset solid-liquid ratios, such as 3:1, 4:1, and 5:1, each corresponding to a target viscosity range and a target density range. The model monitors the acidity, viscosity, and density of the anode slurry during the stirring process in real time, controlling the amount of water or acid solution added to ensure that the viscosity and density parameters fall within the target viscosity and density ranges, and that the acidity of the anode slurry is within the preset acidity range. This results in anode slurry with preset solid-liquid ratio and preset acidity, which facilitates the subsequent blast oxidation leaching reaction.

[0058] The temperature control model receives temperature electrical signals and outputs a second-stage signal to control the steam coil to introduce steam for heating and maintaining the anode mud at a preset temperature, and to maintain the uniform rotation of the mechanical agitator.

[0059] The oxidation control model receives the potential signal and outputs the oxidation signal to control the oxidation gas distributor to output the oxidation gas for the main oxidation stage. When the potential signal is continuously higher than the preset threshold within a preset time period, the oxidation control model outputs the oxygenation signal to control the oxidation gas distributor to output the oxidation gas for the oxygenation and heat preservation stage. The oxidation signal and the oxygenation signal form the third stage signal.

[0060] The first-stage signal, the second-stage signal, and the third-stage signal form the control signal.

[0061] Specifically, the intelligent control unit 3 receives signals from various sensors to achieve precise control of the acid leaching system. Under the action of the first-stage signal, the mechanical stirrer and the slurry tube work together to ensure that the anode mud and the slurry fluid are fully mixed to form an anode mud slurry with a preset solid-liquid ratio and preset acidity. The second-stage signal focuses on temperature management. The steam coil provides a stable heat source according to the set parameters, keeping the anode mud slurry within the optimal reaction temperature range. At the same time, the uniform rotation of the mechanical stirrer further improves the uniformity of temperature distribution. The third-stage signal mainly targets the oxidation process. The oxidation gas distributor dynamically adjusts the supply of oxidation gas according to the changes in the potential signal, providing sufficient oxidation capacity in the main oxidation stage and maintaining a suitable oxidation environment in the oxygen maintenance and heat preservation stage. Through the orderly connection of these three stages of signals, the control signals can comprehensively cover the key links of the acid leaching process, thereby significantly improving the system's operating efficiency and processing effect.

[0062] Preferably, the dynamic execution unit 4 includes a power motor for driving the mechanical agitator, a steam proportional control valve for regulating steam flow, an oxidation proportional control valve for regulating the oxidizing gas flow, a water flow valve for regulating water, and an acid flow valve for regulating the acid solution. The power motor is connected to the mechanical agitator to provide power, driving the agitator to rotate at a set speed, thereby agitating the anode mud and anode mud slurry. The steam proportional control valve is installed at the inlet of the steam coil, precisely controlling the steam flow to ensure the temperature of the anode mud slurry is stably maintained within a preset range. The oxidation proportional control valve dynamically adjusts the supply of oxidizing gas according to the control signal to meet the oxidation capacity requirements at different stages. The water flow valve and acid flow valve are connected to the slurry pipe, which is connected to the water supply device and acid supply device, respectively controlled by the water flow valve and acid flow valve. The water flow valve and acid flow valve are responsible for regulating the flow rates of water and acid solution, respectively. Working together, they ensure that the acidity and solid-liquid ratio of the slurry are always at the optimal state, providing precise control for the acid leaching process and further optimizing the overall performance of the system.

[0063] The power motor, steam proportional control valve, oxidation proportional control valve, water flow valve and acid flow valve are all electrically connected to the intelligent control unit 3;

[0064] The motor receives and drives the mechanical agitator to rotate according to the start signal of the first stage signal. The slurry pipe is connected to the water supply device and the acid supply device. The water flow valve and the acid flow valve control the introduction ratio and introduction amount of water and acid fluid in real time according to the slurry signal and stop signal of the first stage signal, so that the anode mud is mixed with water and acid fluid to form an anode mud slurry with a preset solid-liquid ratio and preset acidity.

[0065] The steam proportional control valve receives and introduces steam into the steam coil according to the second stage signal for heating and maintaining the anode mud material at the preset temperature, and controls the power motor to maintain the uniform rotation of the mechanical agitator.

[0066] The oxidation ratio regulating valve receives and, based on the oxidation signal of the third stage signal, introduces oxidizing gas into the oxidation gas distributor at a first preset gas flow rate. The oxidizing gas and the anode mud undergo an oxidation reaction in the main oxidation stage. When the potential signal is continuously higher than a preset threshold within a preset time period, the oxidation ratio regulating valve, based on the oxygen maintenance signal of the third stage signal, introduces oxidizing gas into the oxidation gas distributor at a second preset gas flow rate. The oxidizing gas and the anode mud undergo an oxidation reaction in the oxygen maintenance and heat preservation stage, resulting in low-copper anode mud and a leachate rich in copper ions. The first preset gas flow rate is greater than the second preset gas flow rate.

[0067] Specifically, the various components in the dynamic execution unit 4 work together precisely to ensure that the acid leaching process is carried out under efficient and stable conditions. The power motor not only provides stirring power but also adjusts the speed according to real-time feedback signals to adapt to the process requirements at different stages. The steam proportioning valve automatically adjusts the steam flow rate by monitoring the temperature changes of the anode mud slurry to avoid affecting the reaction efficiency due to temperature fluctuations. The oxidation proportioning valve dynamically adjusts the supply of oxidizing gas according to the changes in the potential signal, providing sufficient oxygen support in the main oxidation stage and reducing the supply in the oxygen maintenance and heat preservation stage to maintain the stability of the reaction system. The intelligent design not only improves the convenience of operation but also significantly enhances the reliability and maintainability of the system, providing a solid technical guarantee for the optimization of the acid leaching process.

[0068] Please see Figure 2 This invention provides an acid leaching method for reducing the copper content in copper electrolysis anode mud, the method comprising:

[0069] S1: The anode mud is put into leaching reaction unit 1 and slurry fluid is introduced. The anode mud and slurry fluid are stirred to form an anode mud slurry with a preset solid-liquid ratio and preset acidity.

[0070] S2: Start the supply of heating steam and oxidizing gas and introduce them into the leaching reaction unit 1 so that the anode mud material can undergo a forced-air oxidation leaching reaction at a preset temperature;

[0071] S3: Real-time monitoring of the anode mud preparation process and the blower oxidation leaching process, generating control signals, and outputting regulation signals after processing the control signals;

[0072] S4: The control signal is input to the dynamic execution unit 4. The dynamic execution unit 4 controls the amount of slurry fluid introduced, the amount of heating steam introduced, and the amount of oxidizing gas introduced in real time, so that the anode mud obtains an anode mud slurry with a preset solid-liquid ratio in the leaching reaction unit 1. The anode mud slurry undergoes a forced-air oxidation leaching reaction with oxidizing gas at a preset temperature. Within a preset reaction time, low-copper anode mud and a leachate rich in copper ions are obtained. The preset reaction time is 16~20 hours, and the pressure of the heating steam is controlled at 0.25MPa~0.29MPa.

[0073] Furthermore, the obtained low-copper anode mud and copper-rich leachate are pumped to a filter press for filtration to obtain low-copper anode mud and copper-rich leachate, and the filter cake is washed.

[0074] Specifically, after the anode mud is added to the leaching reaction unit 1, it is necessary to ensure that the amount of slurry fluid introduced is precisely matched with the mass ratio of the anode mud to achieve an ideal solid-liquid ratio. By adjusting the flow rate of the oxidizing gas and the pressure of the heating steam, the reaction system is maintained within a stable temperature range, thereby promoting the effective leaching of copper ions. At the same time, the dynamic execution unit 4 automatically adjusts various parameters based on real-time monitoring data to prevent the reaction conditions from deviating from the preset values ​​due to environmental changes. In addition, during the forced-air oxidation leaching process, samples need to be collected periodically for component analysis to evaluate the leaching efficiency of copper ions and optimize the control strategy in a timely manner, ultimately achieving a significant reduction in the copper content in the anode mud.

[0075] Preferably, the slurry fluid includes water and an acid solution, with a preset solid-liquid ratio range of 3 to 5:1. This solid-liquid ratio range ensures that the anode mud slurry has good fluidity and sufficient reaction contact area during the leaching reaction, thereby improving the leaching efficiency of copper ions. The concentration of the acid solution needs to be optimized and adjusted according to the specific composition of the anode mud to avoid unnecessary side reactions or equipment corrosion due to excessive concentration, while also preventing the concentration from being too low and affecting the leaching effect.

[0076] Preferably, the acid solution is a dilute acid solution obtained from the final copper removal solution of the three-stage purification process in the copper electrolysis system. Its acidity is used to regulate the initial acidity of the entire system, ensuring a suitable acidic environment at the beginning of the reaction, thereby effectively activating copper ions in the anode mud. The use of the dilute acid solution not only achieves resource recycling but also reduces the risk of impurities from the introduction of external acid solutions. Furthermore, by precisely controlling the amount of dilute acid solution added, the acidity balance of the system can be further optimized, avoiding adverse effects on subsequent processes due to excessively high or low acidity. This regulation method improves copper leaching efficiency while also ensuring the stability and economy of the system.

[0077] Preferably, the preset temperature is 82℃~85℃. This temperature range can effectively promote the dissolution reaction of copper ions in the anode mud, while avoiding excessive evaporation of the solution or increased energy consumption due to excessive temperature. Within this temperature range, the acid leaching system can maintain a high reaction rate, ensuring the efficient transfer of copper ions from the solid phase to the liquid phase.

[0078] Preferably, the preset acidity is 350 g / L to 450 g / L. This acidity range ensures optimal dissolution of copper ions in the anode mud during acid leaching, while avoiding unnecessary side reactions caused by excessively high acidity. Within this acidity range, the system effectively inhibits the leaching of impurity elements, thereby improving the purity of the copper product. Furthermore, maintaining stable acidity conditions significantly reduces the processing pressure of subsequent neutralization and purification processes, further optimizing the efficiency and cost control of the overall process.

[0079] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An acid leaching system for reducing the copper content of copper electrolytic anode slime, characterized in that, The application relates to a low-copper anode slime production method and device. The application comprises: a leaching reaction unit for slurry preparation of anode slime to form anode slime slurry with a preset solid-liquid ratio and a preset acidity and blast oxygenation leaching reaction of the anode slime slurry; a multi-parameter real-time sensing unit, which is built in the leaching reaction unit, is used for online real-time monitoring of the solid-liquid ratio, oxidation-reduction potential, acidity and temperature of the anode slime slurry, and forms a control signal; an intelligent control unit, which is electrically connected with the multi-parameter real-time sensing unit, receives the control signal and outputs a regulation and control signal; 2. The acid leaching system for reducing copper content of copper electrolysis anode slime according to claim 1, characterized in that: a dynamic execution unit, which is electrically connected with the intelligent control unit, is installed on the leaching reaction unit, receives and executes, according to the regulation and control signal, the slurry preparation of the anode slime to form the anode slime slurry and the blast oxygenation leaching reaction of the anode slime slurry in the leaching reaction unit, and obtains low-copper anode slime and leaching solution rich in copper ions. The leaching reaction unit comprises a leaching tank with a built-in mechanical stirrer, a slurry pipe, a steam coil and an oxidation gas distributor; 3. The acid leaching system for reducing copper content of copper electrolysis anode slime according to claim 2, characterized in that: The leaching tank is used for slurry preparation of anode slime to form anode slime slurry with a preset solid-liquid ratio and a preset acidity and blast oxygenation leaching reaction of the anode slime slurry, wherein the mechanical stirrer is used for slurry preparation stirring of the anode slime and stirring in the blast oxygenation leaching process, the slurry pipe is used for introduction of slurry fluid, the steam coil is used for introduction of steam with a preset temperature, and the oxidation gas distributor is used for introduction of oxidation gas; the mechanical stirrer is electrically connected with the dynamic execution unit. The multi-parameter real-time sensing unit comprises an oxidation-reduction potential sensor, an online acidity analyzer, a temperature sensor, an online viscometer and an online densimeter; The oxidation-reduction potential sensor, the online acidity analyzer, the temperature sensor, the online viscometer and the online densimeter are all built in and installed in the leaching tank; the oxidation-reduction potential sensor is used for real-time monitoring of the oxidation-reduction potential of the anode slime slurry and forms a potential signal; the online acidity analyzer is used for real-time monitoring of the free acid concentration of the anode slime slurry and forms an acidity electric signal; the temperature sensor is used for real-time monitoring of the temperature of the anode slime slurry and forms a temperature electric signal; the online viscometer is used for real-time monitoring of the viscosity of the anode slime slurry and forms a viscosity electric signal; and the online densimeter is used for real-time monitoring of the density of the anode slime slurry and forms a density electric signal.

4. The acid leaching system for reducing copper content of copper electrolysis anode slime according to claim 3, characterized in that: The potential signal, the acidity electric signal, the temperature electric signal, the viscosity electric signal and the density electric signal form the control signal. The intelligent control unit comprises a slurry preparation control model, a temperature control model and an oxidation control model. The pulp control model receives a viscosity electric signal and a density electric signal, the pulp control model comprises a preset liquid-solid ratio-viscosity-density corresponding relationship database, the pulp control model outputs a start signal for controlling the start of the mechanical stirrer, the pulp control model outputs a pulping signal for controlling the pulp pipe to guide the pulping fluid, the pulp control model compares the viscosity electric signal and the density electric signal with the liquid-solid ratio-viscosity-density corresponding relationship database, and outputs a stop signal for stopping the pulp pipe to guide the pulping fluid according to the viscosity electric signal, the density electric signal and the acidity electric signal, and the start signal, the pulping signal and the stop signal form a first stage signal, wherein the pulping fluid comprises water and an acid solution; The temperature control model receives a temperature electric signal, the temperature control model outputs a second stage signal for controlling the steam coil to guide the steam to heat and maintain the anode slurry to a preset temperature and maintain the mechanical stirrer to rotate uniformly; The oxidation control model receives a potential signal, the oxidation control model outputs an oxidation signal for controlling the oxidation gas distributor to guide the oxidation gas to the main oxidation stage, when the potential signal is continuously higher than a preset threshold value within a preset time period, the oxidation control model outputs a maintenance oxygen signal for controlling the oxidation gas distributor to guide the oxidation gas to the maintenance oxygen keeping stage, and the oxidation signal and the maintenance oxygen signal form a third stage signal; The first stage signal, the second stage signal and the third stage signal form a regulation signal.

5. The acid leaching system for reducing copper content of copper electrolysis anode slime according to claim 4, characterized in that: The dynamic execution unit comprises a power motor for driving the mechanical stirrer, a steam proportional regulating valve for regulating the steam flow, an oxidation proportional regulating valve for regulating the oxidation gas flow, a water flow valve for regulating the water and an acid flow valve for regulating the acid solution; The power motor receives and drives the mechanical stirrer to rotate according to the start signal of the first stage signal, the pulp pipe is connected to a water supply device and an acid supply device, the water flow valve and the acid flow valve control the guiding proportion and the guiding amount of the water and the acid flow in real time according to the pulping signal and the stop signal of the first stage signal, so that the anode slurry is mixed with the water and the acid flow to form an anode slurry with a preset solid-liquid ratio and a preset acidity; The steam proportional regulating valve receives and guides the steam into the steam coil according to the second stage signal to heat and maintain the anode slurry to a preset temperature, and controls the power motor to maintain the mechanical stirrer to rotate uniformly; The oxidation proportional regulating valve receives and guides the oxidation gas into the oxidation gas distributor at a first preset gas flow rate according to the oxidation signal of the third stage signal, so that the oxidation gas and the anode slurry perform an oxidation reaction in the main oxidation stage, when the potential signal is continuously higher than a preset threshold value within a preset time period, the oxidation proportional regulating valve guides the oxidation gas into the oxidation gas distributor at a second preset gas flow rate according to the maintenance oxygen signal of the third stage signal, so that the oxidation gas and the anode slurry perform an oxidation reaction in the maintenance oxygen keeping stage to obtain a low-copper anode slurry and a leaching solution rich in copper ions, wherein the first preset gas flow rate is greater than the second preset gas flow rate.

6. A process for reducing the copper content of copper electrolysis anode slime by acid leaching, using the system for reducing the copper content of copper electrolysis anode slime by acid leaching according to any one of claims 1 to 5, characterized in that The method comprises: The anode slime is put into the leaching reaction unit, and a slurry fluid is introduced to stir the anode slime with the slurry fluid to form anode slime slurry with a preset solid-liquid ratio and a preset acidity; The supply of heating steam and oxidizing gas is started, and the heating steam and the oxidizing gas are introduced into the leaching reaction unit to make the anode slime slurry perform the air blowing and oxidizing leaching reaction at a preset temperature; The anode slime slurry process and the air blowing and oxidizing leaching process are monitored in real time to form a control signal, and the control signal is outputted after being processed into a regulation and control signal; The regulation and control signal is inputted into a dynamic execution unit, and the dynamic execution unit controls the introduction amount of the slurry fluid, the introduction amount of the heating steam, and the introduction amount of the oxidizing gas in real time to make the anode slime obtain the anode slime slurry with the preset solid-liquid ratio in the leaching reaction unit, and the anode slime slurry performs the air blowing and oxidizing leaching reaction with the oxidizing gas at the preset temperature to obtain low-copper anode slime and leaching solution rich in copper ions within a preset reaction time.

7. The process for acid leaching of copper from copper electrolytic anode slime as claimed in claim 6 wherein: The slurry fluid comprises water and an acid solution, and the preset solid-liquid ratio ranges from 3 to 5:

1.

8. The process for acid leaching of copper from copper electrolytic anode slime as claimed in claim 7 wherein: The acid solution is a dilute acid solution obtained from the final liquid of the three-stage copper removal in the purification of a copper electrolysis system.

9. The acid leaching process for reducing copper content of copper electrolytic anode slime as claimed in claim 6 wherein: The preset temperature ranges from 82°C to 85°C.

10. The acid leaching process for reducing copper content of copper electrolytic anode slime as claimed in claim 6 wherein: The preset acidity ranges from 350 g / L to 450 g / L.

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