A process for expanding the lead bullion refining slag gold contact interface and efficiently separating the refining slag

Abstract

The present application belongs to the technical field of crude lead refining, and particularly relates to a process for expanding the contact interface of crude lead refining slag and gold and efficiently separating the refining slag, which comprises the following steps: step 1, heating crude lead to a molten state in a refining kettle and keeping constant temperature; step 2, adding a refining agent into the refining kettle, and the refining agent covers the surface of the lead liquid; step 3, immersing a supergravity composite stirring multifunctional device below the lead liquid surface and starting rotation, the lead liquid and the refining agent enter from the upper opening of the device, are dispersed in the device through stirring, the refining slag is generated and enriched on the inner wall of the device, and the lead liquid flows out from the lower opening gap of the device and returns to the refining kettle. The present application introduces the supergravity composite stirring separation into the refining process, significantly expands the contact area of the slag and gold, improves the efficiency of the impurity removal reaction, realizes the efficient separation of the refining slag and the lead liquid, the removal rate of the refining slag is more than 99.9%, the refining time is shortened, and the amount of the refining agent is reduced, which is superior to the existing refining process level.

Description

Technical Field

[0001] This invention relates to the field of crude lead refining technology, and in particular to a process for expanding the gold contact interface of crude lead refining slag and efficiently separating the refining slag. Background Technology

[0002] Lead sulfide concentrate is a polymetallic symbiotic ore. Direct smelting produces crude lead melt containing large amounts of impurities such as Cu, As, Sb, and Sn. These impurities affect the properties of metallic lead. To remove harmful impurities and recover precious metals and other valuable elements, crude lead must be refined. Currently, the melting and precipitation method is mainly used for preliminary copper removal. However, the resulting lead melt still contains large amounts of As, Sb, and Sn impurities. Because these three elements have similar chemical properties, they are often removed simultaneously. Currently, oxidation or alkaline refining methods are mainly used to enrich these three impurities in the oxidizing or alkaline slag. Alkaline refining is widely used in pyrometallurgical refineries due to its advantages such as low impurity removal temperature, good operating conditions, lower arsenic, tin, and antimony content in the final product, and recoverable reagents. However, current limitations in slag-gold reactions during refining result in the consumption of large amounts of refining agents and long processing times. Furthermore, the generated impurity oxides easily encapsulate metallic lead, leading to lead loss. Therefore, strengthening the refining process while achieving efficient separation of the refining slag is crucial. Summary of the Invention

[0003] The purpose of this invention is to provide a process for expanding the gold-slag contact interface in crude lead refining slag and efficiently separating the refining slag, so as to solve the limitations of the gold-slag reaction in the above-mentioned refining process and the problem of metallic lead entrainment in the refining slag, while reducing the amount of refining agent and shortening the refining time.

[0004] To achieve the above objectives, the present invention provides a process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag, mainly comprising the following steps: Step 1: Heat the crude lead to a molten state in a refining pot and maintain a constant temperature; Step 2: Add the refining agent to the refining pot, ensuring the refining agent covers the surface of the molten lead. Step 3: Immerse the multi-functional supergravity composite stirring device below the surface of the lead liquid and start rotating it. The lead liquid and refining agent enter from the top of the device and are dispersed by stirring inside the device. Refining slag is generated and accumulates on the inner wall of the device. The lead liquid flows out from the gap at the bottom of the device and returns to the refining pot.

[0005] Preferably, in step 1, the refining pot is a refining device used in the pyrometallurgical refining process of crude lead.

[0006] Preferably, in step 1, the crude lead is the lead liquid obtained after copper removal by pyrometallurgical process, and the lead liquid contains As, Sn and Sb elements.

[0007] Preferably, in step 1, the temperature of the crude lead is maintained at 450-480℃.

[0008] Preferably, in step 2, the amount of refining agent used is 2-5 times the total mass of impurities to be removed from the lead liquid, and the impurities to be removed are As, Sn and Sb.

[0009] Preferably, in step 2, the refining agent is a mixture of NaNO3-NaOH-NaCl.

[0010] Preferably, in the NaNO3-NaOH-NaCl mixture, the mass ratio of NaNO3, NaOH, and NaCl is (4-6):(4-6):(0.5-1.5).

[0011] In further detail regarding the present invention, in step 2, a mixture of NaNO3-NaOH-NaCl is used as a refining agent, wherein NaNO3 is an oxidant in the refining process, NaOH can act as an absorbent for impurity oxides, and NaCl can enhance the absorption capacity of NaOH for impurity oxides.

[0012] In further explanation of the present invention, a mixture of NaNO3-NaOH-NaCl is used as a refining agent. At a temperature of 450-480°C, the mixture melts into a liquid phase and covers the surface of the lead liquid. During the refining process, NaNO3 in the refining agent decomposes and releases oxygen, which oxidizes the impurity elements (As, Sn, Sb) in the crude lead into oxides, which are then absorbed by NaOH on the surface of the lead liquid. At this time, the slag-gold contact interface is only the surface of the lead liquid.

[0013] In further explanation of the present invention, in step 3, a multi-functional supergravity composite stirring device is introduced into the refining process. A supergravity field with a gravity coefficient of G=100-500 can be generated inside the device by high-speed rotation. At the same time, the device has a composite stirring paddle with an opening at the top and a gap at the bottom, which allows the liquid phase to circulate inside and outside the device during rotation.

[0014] In further detail regarding the present invention, in step 3, the multifunctional supergravity composite stirring device is immersed in the lead liquid surface and rotated, with the gravity coefficient controlled at G=100-500. The crude lead liquid and refining agent enter from the top of the device. Under the stirring action of the device, the refining agent is drawn into the interior of the lead liquid, forming a large number of tiny slag-gold interfaces, significantly expanding the slag-gold contact interface area. At the same time, a large amount of refining slag formed enters the device along with the lead liquid. Under the strong drive of the supergravity field generated by the rotation of the device, the refining slag and lead liquid undergo efficient separation. That is, the refining slag is forcibly pushed towards and enriched on the inner wall of the device, while the separated lead liquid flows out from the gap at the bottom of the device and flows back into the main body of the refining pot, realizing the synchronous and continuous reaction and separation, thereby achieving efficient separation of refining slag and lead liquid.

[0015] In this invention, the expansion of the slag-gold contact interface in crude lead refining is mainly achieved through the combined functions of the aforementioned high-gravity composite stirring multifunctional device. On one hand, the high-speed rotation of the device creates forced circulation within the crude lead molten material, allowing continuous exchange between the lead molten material and the refining agent inside and outside the device. On the other hand, the stirring paddle inside the device provides powerful shearing and dispersing effects, dispersing the refining agent within the lead molten material and forming numerous tiny slag-gold interfaces. Through these two aspects, the single planar contact interface in the traditional process is transformed into a three-dimensional contact surface, significantly improving reaction efficiency.

[0016] Preferably, in step 3, the temperature of the supergravity composite stirring multifunctional device immersed in the molten pool is 25-600℃.

[0017] Preferably, in step 3, the gravity coefficient of the multi-functional supergravity composite stirring device is 100-500G.

[0018] Preferably, in step 3, the centrifugal rotation time of the multifunctional supergravity composite stirring device is 20-40 minutes.

[0019] The present invention discloses the following technical effects: Compared to existing technologies, this invention provides a process for expanding the gold-slag contact interface in crude lead refining and efficiently separating the refining slag. By applying a multi-functional, high-gravity composite stirring device to the crude lead refining process, it simultaneously enhances impurity removal and achieves efficient separation of the refining slag. During the refining process, the stirring action of the high-gravity composite stirring device draws the refining agent into the molten lead, forming numerous tiny slag-gold interfaces. This significantly expands the three-dimensional contact area, extending the impurity removal reaction from the surface to the entire volume of the molten lead, greatly improving reaction efficiency. Simultaneously, under the influence of the high-gravity field generated by the device, the refining slag is instantly enriched on the inner wall of the device, while the molten lead flows out from the lower opening and returns to the refining pot, achieving efficient separation of the refining slag and molten lead. The refining slag removal rate is over 99.9%. Compared to traditional refining processes, the process provided by this invention effectively shortens refining time, reduces the amount of refining agent used, and reduces the loss of metallic lead due to impurity oxide encapsulation, thereby improving the direct lead recovery rate and product quality. The process provided by this invention can significantly expand the contact area between slag and gold, enhance the impurity removal process, and achieve efficient separation of refining slag. Moreover, the process is simple, the separation efficiency is high, and it has good prospects for industrial application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the process of the present invention; Figure 2 The macroscopic morphology and SEM image of the crude lead refining and separation sample from Example 1 are shown. Figure 3 The image shows the XRD pattern of the crude lead refining and separation sample from Example 1.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

[0024] This invention proposes a process to expand the gold-slag contact interface in crude lead refining and to efficiently separate the refining slag, thereby solving the limitations of the gold-slag reaction in the crude lead refining process and the problem of metallic lead entrainment in the refining slag in the existing technology.

[0025] To achieve the above objectives, the present invention provides a process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag, mainly comprising the following steps: Step 1: Heat the crude lead to a molten state in a refining pot and maintain a constant temperature; Step 2: Add the refining agent to the refining pot, ensuring the refining agent covers the surface of the molten lead. Step 3: Immerse the multi-functional supergravity composite stirring device below the surface of the lead liquid and start rotating it. The lead liquid and refining agent enter from the top of the device and are dispersed by stirring inside the device. Refining slag is generated and accumulates on the inner wall of the device. The lead liquid flows out from the gap at the bottom of the device and returns to the refining pot.

[0026] Preferably, in step 1, the refining pot is a refining device used in the pyrometallurgical refining process of crude lead.

[0027] Preferably, in step 1, the crude lead is the lead liquid obtained after copper removal by pyrometallurgical process, and the lead liquid contains As, Sn and Sb elements.

[0028] Preferably, in step 1, the temperature of the crude lead is maintained at 450-480℃.

[0029] Preferably, in step 2, the amount of refining agent used is 2-5 times the total mass of impurities to be removed from the lead liquid, and the impurities to be removed are As, Sn and Sb.

[0030] Preferably, in step 2, the refining agent is a mixture of NaNO3-NaOH-NaCl.

[0031] Preferably, in the NaNO3-NaOH-NaCl mixture, the mass ratio of NaNO3, NaOH, and NaCl is (4-6):(4-6):(0.5-1.5).

[0032] In further detail regarding the present invention, in step 2, a mixture of NaNO3-NaOH-NaCl is used as a refining agent, wherein NaNO3 is an oxidant in the refining process, NaOH can act as an absorbent for impurity oxides, and NaCl can enhance the absorption capacity of NaOH for impurity oxides.

[0033] Preferably, a mixture of NaNO3-NaOH-NaCl is used as a refining agent. At a temperature of 450-480℃, the mixture melts into a liquid phase and covers the surface of the lead liquid. During the refining process, NaNO3 in the refining agent decomposes and releases oxygen, which oxidizes the impurity elements (As, Sn, Sb) in the crude lead into oxides, which are then absorbed by NaOH on the surface of the lead liquid. At this time, the slag-gold contact interface is only the surface of the lead liquid.

[0034] Preferably, in step 3, a multi-functional supergravity composite stirring device is introduced into the refining process. The device generates a supergravity field with a gravity coefficient of G=100-500 through high-speed rotation. At the same time, the device has a composite stirring paddle with an opening at the top and a gap at the bottom, which allows the liquid phase to circulate inside and outside the device during rotation.

[0035] Preferably, in step 3, the multi-functional supergravity composite stirring device is immersed in the lead liquid surface and rotated, with the gravity coefficient controlled at G=100-500. The crude lead liquid and refining agent enter from the top of the device. Under the stirring action of the device, the refining agent is drawn into the interior of the lead liquid, forming a large number of tiny slag-gold interfaces, significantly expanding the slag-gold contact interface area. At the same time, a large amount of refining slag formed enters the device along with the lead liquid. Under the strong drive of the supergravity field generated by the rotation of the device, the refining slag and lead liquid undergo efficient separation. That is, the refining slag is forced to be pushed towards and enriched on the inner wall of the device, while the separated lead liquid flows out from the gap at the bottom of the device and flows back into the main body of the refining pot, realizing the synchronous and continuous reaction and separation, thereby achieving efficient separation of refining slag and lead liquid.

[0036] Preferably, in this invention, the expansion of the crude lead refining slag-gold contact interface is mainly achieved through the combined functions of the aforementioned high-gravity composite stirring multifunctional device. On one hand, the high-speed rotation of the device creates forced circulation within the crude lead molten material, allowing continuous exchange between the lead molten material and the refining agent inside and outside the device. On the other hand, the stirring paddle inside the device provides powerful shearing and dispersing effects, dispersing the refining agent within the lead molten material and forming numerous tiny slag-gold interfaces. Through these two aspects, the single planar contact interface in the traditional process is transformed into a three-dimensional contact surface, significantly improving reaction efficiency.

[0037] Preferably, in step 3, the temperature of the supergravity composite stirring multifunctional device immersed in the molten pool is 25-600℃.

[0038] Preferably, in step 3, the gravity coefficient of the multi-functional supergravity composite stirring device is 100-500G.

[0039] Preferably, in step 3, the centrifugal rotation time of the multifunctional supergravity composite stirring device is 20-40 minutes.

[0040] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0041] Example 1 A process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag includes the following steps: Step 1: In the refining pot, the temperature of the lead liquid after pyrometallurgical copper removal is controlled at 450℃; the composition of the lead liquid is: Pb 99.97wt%, As 0.01wt.%, Sn 0.01wt.%, Sb 0.01wt.%. Step 2: Add a refining agent, which is three times the total mass of the impurities As, Sn and Sb to be removed from the lead liquid, into the refining pot. The refining agent covers the surface of the lead liquid. The refining agent is a mixture of NaNO3-NaOH-NaCl, and the mass ratio of NaNO3, NaOH and NaCl is 4.5:4.5:1. Step 3: Immerse the multi-functional supergravity composite stirring device on the surface of the lead liquid and start its rotation, maintaining a gravity coefficient G=300. The device is centrifugally rotated for 40 minutes. During the centrifugal rotation of the device, the lead liquid and refining agent enter from the top of the device and are dispersed by stirring inside the device. Refining slag is generated and enriched on the inner wall of the device, while the lead liquid flows out from the gap at the bottom of the device and returns to the refining pot, thus achieving the separation of lead liquid and refining slag.

[0042] Samples were taken and analyzed from the refined slag and the molten lead in the refined pot after separation in this embodiment. The macroscopic morphology and SEM and XRD patterns of the separated samples are shown below. Figure 2 , Figure 3 As shown. By Figure 2It can be seen that the refining slag in the lead melt was efficiently separated. The separated refining slag mainly consisted of NaCl and the corresponding sodium salts formed by impurity oxides. The purity of the lead melt after separation was also very high, with a Pb content as high as 99.998 wt%, and the removal rate of the refining slag was 99.9%, as shown in Table 1. Figure 3 As can be seen, no metallic lead phase was found in the XRD pattern of the separated refining slag, while only a single Pb diffraction peak appeared in the XRD pattern of the lead liquid, further proving the efficient separation of the refining slag and the lead liquid.

[0043] Table 1 Chemical composition of the lead solution after separation Example 2 A process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag includes the following steps: Step 1: In the refining pot, the temperature of the lead liquid after pyrometallurgical copper removal is controlled at 480℃; the composition of the lead liquid is: Pb 99.97wt%, As 0.01wt.%, Sn 0.01wt.%, Sb 0.01wt.%. Step 2: Add a refining agent, which is 5 times the total mass of the impurities As, Sn and Sb to be removed from the lead liquid, into the refining pot. The refining agent covers the surface of the lead liquid. The refining agent is a mixture of NaNO3-NaOH-NaCl, and the mass ratio of NaNO3, NaOH and NaCl is 4.5:4.5:1. Step 3: Immerse the multi-functional supergravity composite stirring device on the surface of the lead liquid and start its rotation, maintaining a gravity coefficient G=400. The device is centrifugally rotated for 20 minutes. During the centrifugal rotation of the device, the lead liquid and refining agent enter from the top of the device and are dispersed by stirring inside the device. Refining slag is generated and enriched on the inner wall of the device, while the lead liquid flows out from the gap at the bottom of the device and returns to the refining pot, thus achieving the separation of lead liquid and refining slag.

[0044] Comparative Example 1 A crude lead refining process includes the following steps: Step 1: In the refining pot, the temperature of the lead liquid after pyrometallurgical copper removal is controlled at 480℃; the composition of the lead liquid is: Pb 99.97wt%, As 0.01wt.%, Sn 0.01wt.%, Sb 0.01wt.%. Step 2: Add a refining agent, which is three times the total mass of the impurities As, Sn and Sb to be removed from the lead liquid, into the refining pot. The refining agent covers the surface of the lead liquid. The refining agent is a mixture of NaNO3-NaOH-NaCl, and the mass ratio of NaNO3, NaOH and NaCl is 4.5:4.5:1. Step 3: Maintain the temperature for crude lead refining for 30 minutes; Step 4: After refining, immerse the supergravity separation device on the surface of the molten lead. The supergravity separation device has an opening at the top and a gap at the bottom. Start the device and maintain the gravity coefficient G=300 for 10 minutes. During the separation, the molten lead and refining slag enter from the top of the device. After separation inside the device, the refining slag accumulates on the inner wall of the device, while the molten lead flows out from the gap at the bottom of the device and returns to the refining pot, thus achieving the separation of molten lead and refining slag.

[0045] Samples were taken from the refined slag and the molten lead in the refining pot after separation in this comparative example for analysis. The Pb content in the molten lead after separation was only 99.975 wt%, and the removal rate of the refined slag was 99.5%. The analysis results show that the Pb content in the molten lead obtained in this comparative example is significantly lower than that in Example 1, and the removal rate of the refined slag is also lower than that in Example 1. This indicates that without the introduction of the supergravity composite stirring separation of this invention, using the same amount of refining agent and refining time, the insufficient contact between the slag and gold interface during the refining process in this comparative example results in a lower impurity removal rate and a significantly worse refining effect than in Example 1. Therefore, the process of this invention can significantly improve the impurity removal efficiency and achieve efficient separation of molten lead and refined slag.

[0046] Comparative Example 2 A crude lead refining process includes the following steps: Step 1: In the refining pot, the temperature of the lead liquid after pyrometallurgical copper removal is controlled at 480℃; the composition of the lead liquid is: Pb 99.97wt%, As 0.01wt.%, Sn 0.01wt.%, Sb 0.01wt.%. Step 2: Add a refining agent, which is three times the total mass of the impurities As, Sn and Sb to be removed from the lead liquid, into the refining pot. The refining agent covers the surface of the lead liquid. The refining agent is a mixture of NaNO3-NaOH-NaCl, and the mass ratio of NaNO3, NaOH and NaCl is 4.5:4.5:1. Step 3: Maintain the temperature for crude lead refining for 120 minutes; Step 4: After refining, immerse the supergravity separation device on the surface of the molten lead. The supergravity separation device has an opening at the top and a gap at the bottom. Start the device and maintain the gravity coefficient G=300 for 10 minutes. During the separation, the molten lead and refining slag enter from the top of the device. After separation inside the device, the refining slag accumulates on the inner wall of the device, while the molten lead flows out from the gap at the bottom of the device and returns to the refining pot, thus achieving the separation of molten lead and refining slag.

[0047] The lead solution obtained after separation in this comparative example was sampled and analyzed. The Pb content in the separated lead solution was 99.986 wt%. The analysis results show that the Pb content in the lead solution obtained in this comparative example is significantly lower than that in Example 1, and the refining time is significantly longer than that in Example 1. This indicates that without the introduction of the supergravity composite stirring separation of this invention, even with extended refining time, the refining effect is significantly worse than that in Example 1. Therefore, the process of this invention can significantly shorten the refining time and improve the impurity removal efficiency.

[0048] Comparative Example 3 A crude lead refining process includes the following steps: Step 1: In the refining pot, the temperature of the lead liquid after pyrometallurgical copper removal is controlled at 480℃; the composition of the lead liquid is: Pb 99.97wt%, As 0.01wt.%, Sn 0.01wt.%, Sb 0.01wt.%. Step 2: Add a refining agent, which is 8 times the total mass of the impurities As, Sn and Sb to be removed from the lead liquid, into the refining pot. The refining agent covers the surface of the lead liquid. The refining agent is a mixture of NaNO3-NaOH-NaCl, and the mass ratio of NaNO3, NaOH and NaCl is 4.5:4.5:1. Step 3: Maintain the temperature for crude lead refining for 120 minutes; Step 4: After refining, immerse the supergravity separation device on the surface of the molten lead. The supergravity separation device has an opening at the top and a gap at the bottom. Start the device and maintain the gravity coefficient G=300 for 10 minutes. During the separation, the molten lead and refining slag enter from the top of the device. After separation inside the device, the refining slag accumulates on the inner wall of the device, while the molten lead flows out from the gap at the bottom of the device and returns to the refining pot, thus achieving the separation of molten lead and refining slag.

[0049] The lead solution obtained after separation in this comparative example was sampled and analyzed. The Pb content in the separated lead solution was 99.996 wt%. The analysis results show that the Pb content in the lead solution obtained in this comparative example is close to that of Example 1, but the amount of refining agent used is significantly higher than that of Example 1, and the refining time is significantly longer. This indicates that without the introduction of the supergravity composite stirring separation of this invention, even with a significant increase in the amount of refining agent and an extended refining time, the refining effect can only approach the level of Example 1 of this invention, and is still slightly inferior. Therefore, the process of this invention can significantly shorten the refining time while greatly reducing the consumption of refining agent, achieving a highly efficient and low-consumption refining process.

[0050] This invention provides a process for expanding the gold-slag contact interface in crude lead refining and efficiently separating the refining slag. By applying a multi-functional, high-gravity composite stirring device to the crude lead refining process, it simultaneously enhances impurity removal and achieves efficient separation of the refining slag. Through the stirring action of the device, the refining agent is drawn into the interior of the molten lead, forming numerous tiny slag-gold interfaces. This significantly expands the three-dimensional contact area, extending the impurity removal reaction from the surface to the entire volume of the molten lead, greatly improving reaction efficiency. Simultaneously, under the influence of a high-gravity field, the refining slag is instantly enriched on the inner wall of the device, while the molten lead flows out from the lower opening and returns to the refining pot, achieving efficient separation of the refining slag and molten lead. The refining slag removal rate is over 99.9%. Furthermore, the process provided by this invention effectively shortens refining time, reduces the amount of refining agent used, and decreases the loss of metallic lead due to impurity oxide encapsulation, thereby improving the direct lead recovery rate and product quality. The process provided by this invention can significantly expand the slag-gold contact area, enhance the impurity removal process, and achieve efficient separation of the refining slag. Moreover, the process flow is simple, the separation efficiency is high, and it has good prospects for industrial application.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag, characterized in that, Includes the following steps: Step 1: Heat the crude lead to a molten state in a refining pot and maintain a constant temperature; Step 2: Add the refining agent to the refining pot, ensuring the refining agent covers the surface of the molten lead. Step 3: Immerse the multi-functional supergravity composite stirring device below the surface of the lead liquid and start rotating it. The lead liquid and refining agent enter from the top of the device and are dispersed by stirring inside the device. Refining slag is generated and accumulates on the inner wall of the device. The lead liquid flows out from the gap at the bottom of the device and returns to the refining pot.

2. The process for expanding the gold contact interface of crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 1, the refining pot is a refining device used in the pyrometallurgical refining process of crude lead.

3. The process for expanding the gold contact interface of crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 1, the crude lead is the lead liquid after copper removal by fire method, and the lead liquid contains As, Sn and Sb elements.

4. The process for expanding the gold contact interface in crude lead refining slag and efficiently separating the refining slag according to claim 1, characterized in that, In step 1, the temperature of the crude lead is maintained at 450-480℃.

5. The process for expanding the gold contact interface in crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 2, the amount of refining agent used is 2-5 times the total mass of impurities to be removed from the lead liquid, and the impurities to be removed are As, Sn and Sb.

6. The process for expanding the gold contact interface of crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 2, the refining agent is a mixture of NaNO3-NaOH-NaCl.

7. The process for expanding the gold contact interface in crude lead refining slag and efficiently separating refining slag according to claim 6, characterized in that, In the NaNO3-NaOH-NaCl mixture, the mass ratio of NaNO3, NaOH, and NaCl is (4-6):(4-6):(0.5-1.5).

8. The process for expanding the gold contact interface in crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 3, the supergravity composite stirring multifunctional device can be immersed in a molten pool with a temperature of 25-600℃.

9. The process for expanding the gold contact interface of crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 3, the gravity coefficient of the supergravity composite stirring multifunctional device is 100-500G.

10. The process for expanding the gold contact interface of crude lead refining slag and efficiently separating refining slag according to claim 1, characterized in that, In step 3, the centrifugal rotation time of the supergravity composite stirring multifunctional device is 20-40 minutes.

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