Method and system for efficiently removing lead from high-lead gold-loaded carbon desorption electrolytic gold mud

Abstract

The invention relates to a method and a system for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud. The method comprises the following steps: baking pretreatment; pyrogenic process smelting; performing gold-silver-copper-lead alloy sheet forming; separating gold, silver, copper and lead alloy: separating gold by nitric acid; removing lead from sponge gold; removing lead from silver nitrate; recycling copper nitrate and the like. The system comprises a trolley furnace and a rotary intermediate frequency furnace connected with the trolley furnace, and a discharging opening of the rotary intermediate frequency furnace is sequentially connected with a lifting intermediate frequency furnace, a water-quenching bead splashing barrel, a gold separation kettle, a first-stage separation reaction kettle and a second-stage separation reaction kettle. A liquid outlet of the secondary separation reaction kettle is sequentially connected with a silver nitrate transfer tank, a silver reaction kettle, a filter tank, a transfer tank, a copper nitrate storage tank and a copper nitrate reaction kettle. According to the method, the lead removal procedure is added after nitric acid separation of the gold-silver-copper-lead alloy and silver nitrate chlorination precipitation, lead impurities in sponge gold and sponge silver produced in the wet smelting process can be efficiently removed, the gold content and the silver content of gold ingot and silver ingot products obtained through smelting are both larger than 99.9%, and therefore it is guaranteed that the quality of the products reaches the standard.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method and system for efficiently removing lead from high-lead gold-loaded carbon desorption electrolytic gold mud. Background Art

[0002] The gold-loaded carbon in the full-mud cyanide carbon slurry gold extraction process is desorbed and electrolyzed at high temperature and high pressure to obtain electrolytic gold mud whose main components are gold (5%), silver (30%), copper (24%), lead (21%), calcium (9%), powdered carbon (1%), ore mud and other impurities (10%). The main methods for extracting gold and silver from cyanide gold mud are pyrometallurgical process, pyrometallurgical-hydrometallurgical combined process, and full hydrometallurgical process. Among them, the pyrometallurgical-hydrometallurgical combined process has the advantages of short process, low pollution, and high one-time recovery rate, and is widely used. The process method is: high-temperature smelting of electrolytic gold mud to enrich the metal, remove impurities entering the slag phase, and enrich to produce gold, silver, copper and lead alloys. The alloy is added to a reactor after water quenching and bead pouring, and gold and other metals are separated under the action of nitric acid. In this process, gold does not participate in the reaction and exists in the bottom of the reactor in a solid form. After drying, it can be directly cast into ingots. Silver, lead, copper and other metals are dissolved and enter the solution, and then a chlorination precipitation-cleaning neutralization-iron powder replacement process is used to achieve silver and copper separation and silver recovery.

[0003] As the lead content in the ore increases, the lead content in the gold-loaded carbon also increases, causing the lead content in the electrolytic gold mud to gradually increase. The gold and silver ingots produced by the traditional pyrometallurgical-hydrometallurgical combined process cannot meet the requirements. Combined with the analysis of this process method, the main reasons are: a part of the lead in the high-lead electrolytic gold mud is oxidized into lead dioxide during the pyrometallurgical smelting and water quenching process. Since lead dioxide has a stronger oxidizing property than nitric acid, lead dioxide does not react with nitric acid during the separation of gold and silver, and eventually remains in the sponge gold in a solid form, resulting in residual impurities in the gold powder. During the smelting process of the gold powder, lead dioxide and gold fuse together to form a gold-lead alloy. The surface of the cast gold ingot is not smooth, the gold ingot becomes brittle, and there are a large number of pores on the surface of the gold ingot, resulting in the gold ingot quality not meeting the standards. In addition, the unoxidized lead still forms alloys with gold, silver, and copper in a single state. During the nitric acid separation process, lead is converted into Pb 2+ The form is dissolved in the solution, and the mixed solution produced by nitric acid separation is added with hydrochloric acid for chlorination precipitation. + , Pb 2+ It is precipitated in the form of AgCl and PbCl2. Since both AgCl and PbCl2 can be replaced by elemental iron, Pb will also be replaced into the sponge silver during the replacement process. During the casting process, metallic silver and lead are eutectic, and the obtained silver ingot has a high impurity content, resulting in the silver ingot quality not meeting the standards. Summary of the invention

[0004] In view of the above problems, the present invention provides a method and system for efficiently removing lead from high-lead gold-loaded carbon desorption electrolytic gold mud, aiming to solve the problem that the traditional pyrometallurgical-wet method combined with hydrometallurgical method to treat high-lead gold-loaded carbon desorption electrolytic gold mud cannot effectively remove lead, and sponge gold and sponge silver contain a large amount of lead impurities, resulting in substandard product quality.

[0005] The specific technical solution is: The present invention provides a method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud, comprising the following steps: S1: Baking pretreatment: Baking the electrolytic gold mud from high-lead carbon slurry to remove moisture from the gold mud, burning and removing the powdered carbon in the gold mud, oxidizing most of the base metals in the gold mud to convert them into metal oxides, so that they can be removed by slag formation during the later pyrometallurgical primary refining; S2: pyrometallurgical smelting: the gold mud baked in step S1 is mixed with borax, sodium carbonate, and silicon dioxide smelting auxiliary materials, and then added into a rotary medium frequency furnace for smelting. Under the action of the slag-forming agent, the base metal oxides in the gold mud slag into the slag phase, and the gold, silver, copper, and lead metals enter the metal phase. After ingot casting, gold, silver, copper, and lead alloys and smelting slag are obtained. After the smelting slag is crushed, the valuable metals can be further recovered; S3: Gold-silver-copper-lead alloy splashing: the gold-silver-copper-lead alloy obtained in step S2 is added into a water-quenched splashing bucket to splash the alloy into flakes; S4: separation of gold, silver, copper and lead alloys, specifically including the following steps: S401: the flake alloy obtained in step S3 is transferred into a gold separation kettle, nitric acid and clean water are added to perform gold separation, and a supernatant and sponge gold (containing lead dioxide) are obtained; the supernatant is transferred to a transfer tank for the next step of processing; S402: The sponge gold (containing lead dioxide) obtained in step S401 is transferred to a primary separation reactor for lead removal, and a 4% to 5% sodium hydroxide solution is added and stirred for reaction for 2 to 3 hours. The lead dioxide in the sponge gold is converted into Na2PbO3 which is easily soluble in water, and the impurity PbO2 is completely removed, thereby obtaining lead-free sponge gold and waste liquid; S403: The sponge gold obtained in step S402 is transferred to a secondary separation reactor, and the residual silver and copper metals in the sponge gold are removed at 100-200° C. to obtain a high-purity sponge gold with silver and copper removed and a mixed solution of silver nitrate, copper nitrate, and lead nitrate, and the sponge gold is dried and cast into an ingot to obtain a high-purity gold ingot; S404: The mixed solution of silver nitrate, copper nitrate and lead nitrate obtained in step S403 is transferred to a silver reaction kettle, and hydrochloric acid is added until Ag in the solution is reduced to 0. + , Pb 2+ After complete precipitation of AgCl and PbCl2, the supernatant is drawn out from the reactor, and clean water is added to wash the mixed solids until the washing liquid is neutral; S405: adding 9% to 10% acetic acid solution and 12% to 13% sodium acetate solution to the AgCl and PbCl2 mixed solid obtained in step S404, reacting for 2 to 3 hours, the PbCl2 in the AgCl will be converted into (CH3COO)2Pb which is easily soluble in water, removing the doped PbCl2, washing the AgCl solid to neutrality, and obtaining AgCl solid and waste liquid; S406: Add clean water to the AgCl solid washed to neutrality in step S405, add 20 kg of hydrochloric acid for slurry treatment, slowly add iron powder in a ratio of 3:1 by mass of silver metal to iron powder, stir and observe until no white precipitate remains in the silver powder, continue stirring for 60 minutes and then add 20 kg of hydrochloric acid, continue stirring for 60 minutes after the addition of hydrochloric acid, then stop stirring, wash the silver powder to neutrality, then bake it, melt and cast it to obtain a high-purity silver ingot; S407: The supernatant extracted in step S404 and the tail liquid from washing AgCl in step S405 still contain a large amount of copper nitrate ions. These copper nitrate solutions are replaced by iron powder to obtain single sponge copper and waste liquid, and the waste liquid enters the wastewater treatment workshop.

[0006] Furthermore, the baking in step S1 is carried out at a temperature of 600-800° C. for 8 hours.

[0007] Furthermore, in step S2, the addition amounts of borax, sodium carbonate and silicon dioxide are respectively added according to 7% to 10%, 2% to 3% and 4% to 5% of the gold mud.

[0008] Furthermore, in step S401, the addition ratio of the flake alloy to the nitric acid is 1:3.0 to 1:3.3.

[0009] Furthermore, in step S404, the addition ratio of silver metal to hydrochloric acid is 1:1.

[0010] The present invention also provides a lead removal system used in the above-mentioned high-lead gold-loaded carbon desorption electrolytic gold mud efficient lead removal method, comprising a trolley furnace and a rotating medium-frequency furnace connected thereto, the discharge port of the rotating medium-frequency furnace is sequentially connected to a lifting medium-frequency furnace, a water quenching bead-sprinkling bucket, a gold separation kettle, a primary separation reactor and a secondary separation reactor, the reagent addition ports of the gold separation kettle and the primary separation reactor are respectively connected to a nitric acid metering tank and a sodium hydroxide metering tank, the discharge port of the secondary separation reactor is connected to a silver nitrate transfer tank, the discharge port of the silver nitrate transfer tank is connected to a silver reactor, the reagent addition port of the silver reactor is connected to a hydrochloric acid metering tank, an acetic acid metering tank and a sodium acetate metering tank, and the discharge port of the silver reactor is sequentially connected to a filter tank, a transfer tank, a copper nitrate storage tank and a copper nitrate reactor.

[0011] Furthermore, the slag outlet of the rotary medium frequency furnace is connected to a jaw crusher.

[0012] Furthermore, more than two gold-separating kettles are provided.

[0013] Furthermore, more than two silver reactors are provided, and two of them are connected to the same set of filter tanks and transfer tanks.

[0014] Furthermore, more than two copper nitrate storage tanks are provided.

[0015] Beneficial effects of the present invention: The present invention adds a lead removal process after the nitric acid separation of the gold, silver, copper and lead alloy and after the chlorination precipitation of silver nitrate. After the nitric acid separation of the gold, silver, copper and lead alloy, by adding sodium hydroxide solution to the sponge gold containing lead dioxide, lead dioxide and NaOH react to generate sodium lead acid Na2PbO3 that is easily soluble in water, thereby removing the lead dioxide doped in the gold powder; after the chlorination precipitation of silver nitrate, by adding acetic acid solution and sodium acetate solution to the precipitated AgCl and PbCl2 mixed solid, the precipitated PbCl2 is converted into (CH3COO)2Pb that is easily soluble in water, thereby removing the PbCl2 doped with the AgCl solid. Through the above-mentioned combined lead removal process, the present invention can efficiently remove the lead impurities in the sponge gold and sponge silver produced in the hydrometallurgical process, so that the gold and silver contents of the gold ingots and silver ingots obtained by smelting are greater than 99.9%, thereby ensuring that the quality of the hydrometallurgical products meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of a method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud of the present invention; Figure 2 The invention relates to a high-lead gold-loaded carbon desorption electrolysis gold mud high-efficiency lead removal system. Figure 1 ; Figure 3 The invention relates to a high-lead gold-loaded carbon desorption electrolysis gold mud high-efficiency lead removal system. Figure 2 ; In the figure: 1-trolley furnace, 2-rotating medium frequency furnace, 3-jaw crusher, 4-lifting medium frequency furnace, 5-water quenching bead pouring bucket, 6-gold separation kettle, 7-primary separation reactor, 8-nitric acid metering tank, 9-sodium hydroxide metering tank, 10-secondary separation reactor, 11-silver nitrate transfer tank, 12-silver reactor, 13-hydrochloric acid metering tank, 14-acetic acid metering tank, 15-sodium acetate metering tank, 16-filter tank, 17-transfer tank, 18-copper nitrate storage tank, 19-copper nitrate reactor. DETAILED DESCRIPTION

[0017] In order to make the technical problems and technical solutions solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example 1

[0018] like Figure 1 As shown, this embodiment provides a method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud, comprising the following steps: S1: Baking pretreatment: Use a trolley furnace to bake the electrolytic gold mud from high-lead carbon slurry at a temperature of 600-800℃ for 8 hours to remove moisture from the gold mud, burn and remove the powdered carbon in the gold mud, oxidize most of the base metals in the gold mud, and convert them into metal oxides so that they can be removed by slag formation during the later primary smelting by pyrometallurgy; S2: Fire smelting: The gold mud baked in step S1 is mixed with borax, sodium carbonate, and silicon dioxide smelting auxiliary materials, and then added into a rotary medium frequency furnace for smelting (the smelting auxiliary materials are added according to 7% to 10% borax, 2% to 3% sodium carbonate, and 4% to 5% silicon dioxide of the dried gold mud). Under the action of the slag-making agent, the remaining active base metals in the gold mud are oxidized and enter the slag phase, and the gold, silver, copper, and lead metals enter the metal phase. After ingot casting, gold, silver, copper, and lead alloys and smelting slag are obtained. The valuable metals can be further recovered after the smelting slag is crushed; S3: Gold-silver-copper-lead alloy splashing: the gold-silver-copper-lead alloy obtained in step S2 is added into a water-quenched splashing bucket to splash the alloy into flakes; S4: separation of gold, silver, copper and lead alloys, specifically including the following steps: S401: The flake alloy obtained in step S3 is transferred to a gold separation kettle, and nitric acid and clean water are added in a ratio of 1:3.0 to 1:3.3 to perform gold separation to obtain a supernatant and sponge gold (containing lead dioxide); the supernatant is transferred to a transfer tank for the next step of processing; S402: The sponge gold (containing lead dioxide) obtained in step S401 is transferred to a primary separation reactor for lead removal treatment, and 4% to 5% sodium hydroxide solution NaOH is added and stirred for reaction for 2 to 3 hours. At this time, the lead dioxide PbO2 in the sponge gold is converted into easily soluble sodium lead acid Na2PbO3, and the impurity PbO2 is completely removed to obtain sponge gold with a purity greater than 95% and waste liquid. The comparison data of sponge gold and its gold content before and after the process are shown in Table 1: Table 1 Comparison of gold content in sponge gold before and after treatment

[0019] S403: The sponge gold obtained in step S402 is transferred to a secondary separation reactor, and the residual silver and copper metals in the sponge gold are removed at 100-200° C. to obtain a high-purity sponge gold with silver and copper removed and a mixed solution of silver nitrate, copper nitrate, and lead nitrate. The sponge gold is dried and cast into an ingot to obtain a gold ingot with a purity greater than 99.9%; S404: The mixed solution of silver nitrate, copper nitrate and lead nitrate obtained in step S403 is transferred to a silver reactor, and hydrochloric acid is added in a ratio of 1:1 between silver metal and hydrochloric acid until Ag in the solution is reduced to 1.+ , Pb 2+ After complete precipitation of AgCl and PbCl2, the supernatant is extracted from the reactor, and clean water is added to wash the mixed solids (to remove copper ions and remaining nitrates) until the washing liquid is neutral; S405: Add 9% to 10% acetic acid solution and 12% to 13% sodium acetate solution to the AgCl and PbCl2 mixed solid obtained in step S404, and react for 2 to 3 hours. The PbCl2 in the AgCl is converted into (CH3COO)2Pb (the solubility of (CH3COO)2Pb in water is 550 g / L) which is easily soluble in water, remove the doped PbCl2, and wash the AgCl solid to neutrality to obtain AgCl solid and waste liquid; the changes in the metal content of various solutions during the silver separation process are shown in Table 2: Table 2 Changes in metal content of various solutions during silver separation

[0020] S406: Add clean water to the AgCl solid washed to neutrality in step S405, add 20 kg of hydrochloric acid for slurry treatment, slowly add iron powder according to the mass ratio of silver metal to iron powder of 3:1, stir and observe until there is no white precipitate remaining in the silver powder, continue stirring for 60 minutes and then add 20 kg of hydrochloric acid, continue stirring for 60 minutes after the addition of hydrochloric acid, and then stop stirring, wash the silver powder to neutrality, and then bake it and melt and cast it to obtain a silver ingot with an Ag content greater than 99.9%; the change of the metal content of the mixed solid during the silver separation process is shown in Table 3: Table 3 Changes in metal content of mixed solids during silver separation

[0021] S407: The supernatant extracted in step S404 and the tail liquid from washing AgCl in step S405 still contain a large amount of copper nitrate ions. These copper nitrate solutions are replaced by iron powder to obtain single sponge copper and waste liquid, and the waste liquid enters the wastewater treatment workshop.

[0022] This embodiment adds a lead removal process after the separation of gold, silver, copper and lead alloy nitric acid and the precipitation of silver nitrate chloride. After the separation of gold, silver, copper and lead alloy nitric acid, by adding sodium hydroxide solution to the sponge gold containing lead dioxide, lead dioxide PbO2 and NaOH react to generate sodium lead acid Na2PbO3 that is easily soluble in water, thereby removing the lead dioxide PbO2 doped in the gold powder; after the precipitation of silver nitrate chloride, by adding acetic acid solution and sodium acetate solution to the precipitated AgCl, PbCl2 mixed solid, the precipitated PbCl2 is converted into (CH3COO)2Pb that is easily soluble in water, thereby removing the PbCl2 doped with AgCl solid. Through the above-mentioned combined lead removal process, the impurity lead in the sponge gold and sponge silver produced by the hydrometallurgical process is effectively removed, and the gold and silver contents of the gold ingots and silver ingots obtained by smelting are greater than 99.9%, and the product quality meets the standards. It can be seen that this method can efficiently remove the lead metal in the electrolytic gold mud desorbed by high-lead gold-loaded carbon, thereby improving the quality of hydrometallurgical products. Example 2

[0023] The present embodiment provides a lead removal system used in the high-lead gold-loaded carbon desorption electrolytic gold mud efficient lead removal method described in Example 1, comprising a trolley furnace 1 and a rotating medium frequency furnace 2 connected thereto, the slag outlet of the rotating medium frequency furnace 2 is connected to a jaw crusher 3, the discharge port of the rotating medium frequency furnace 2 is sequentially connected to a lifting medium frequency furnace 4, a water quenching bead-sprinkling bucket 5, a gold separation kettle 6, a primary separation reactor 7 and a secondary separation reactor 10, the reagent addition ports of the gold separation kettle 6 and the primary separation reactor 7 are respectively connected to a nitric acid metering tank 8 and a sodium hydroxide metering tank 9, the discharge port of the secondary separation reactor 10 is connected to a silver nitrate transfer tank 11, the discharge port of the silver nitrate transfer tank 11 is connected to a silver reactor 12, the reagent addition port of the silver reactor 12 is connected to a hydrochloric acid metering tank 13, an acetic acid metering tank 14 and a sodium acetate metering tank 15, and the discharge port of the silver reactor 12 is sequentially connected to a filter tank 16, a transfer tank 17, a copper nitrate storage tank 18 and a copper nitrate reactor 19.

[0024] This embodiment is based on the lead removal method described in Example 1, and adds supporting equipment corresponding to the lead removal process of sponge gold and sponge silver, thereby forming a set of pyrometallurgical-hydrometallurgical combined smelting system with lead removal function. The specific working principle is as follows: The high-lead gold-loaded carbon desorption electrolytic gold mud is added to the trolley furnace 1 for baking to remove the moisture in the gold mud, burn and remove the powdered carbon in the gold mud, and oxidize most of the base metals in the gold mud to form metal oxides, so that they can be slag-formed and removed during the later primary smelting by pyrometallurgy; after baking, the gold mud is transferred to the rotating medium frequency furnace 2 for smelting, and under the action of the slag-forming agent, the base metal oxides in the gold mud slag into the slag phase, and the gold, silver, copper and lead metals enter the metal phase; then it is transferred to the lifting medium frequency furnace 4 for ingot casting, and then the gold, silver, copper and lead alloy and smelting slag are obtained, and the smelting slag is transferred to the jaw crusher 3 for crushing to further recover the valuable metals.

[0025] The gold, silver, copper and lead alloy is transferred into a water-quenched bead-splashing barrel 5 to obtain a flake alloy; the flake alloy is then transferred into a gold separation kettle 6, and nitric acid is added from a nitric acid metering tank 8 to perform a gold separation operation to separate the sponge gold (containing) and the supernatant, and the supernatant is transferred into a silver nitrate transfer tank 11 for the next step of treatment.

[0026] The sponge gold (containing lead dioxide) is transferred to the primary separation reactor 7 for lead removal. At this time, sodium hydroxide solution is added from the sodium hydroxide metering tank 9. After stirring and reacting for a period of time, the lead dioxide PbO2 in the sponge gold will be converted into sodium lead acid Na2PbO3 which is easily soluble in water, and the doped PbO2 will be completely removed to obtain lead-free sponge gold and waste liquid.

[0027] The lead-free sponge gold is continuously transferred into the secondary separation reactor 10, and the residual silver and copper metals in the sponge gold are removed at 100-200° C. to obtain high-purity sponge gold with silver and copper removed and a mixed solution of silver nitrate, copper nitrate and lead nitrate. After drying, the sponge gold is transferred into the lifting medium frequency furnace 4 for ingot casting to obtain a high-purity gold ingot.

[0028] The mixed solution of silver nitrate, copper nitrate and lead nitrate is then transferred to the silver reactor 12. First, hydrochloric acid is added from the hydrochloric acid metering tank 13 to make the Ag in the solution + , Pb 2+ After AgCl and PbCl2 are completely precipitated, the supernatant is extracted from the kettle for the next step of treatment, and clean water is added to wash the mixed solid (to remove copper ions and remaining nitrate ions) until the washing liquid is neutral; then acetic acid solution and sodium acetate solution are added from the acetic acid metering tank 14 and the sodium acetate metering tank 15. At this time, the PbCl2 in the AgCl will be converted into (CH3COO)2Pb that is easily soluble in water, and the doped PbCl2 is removed. The AgCl solid is washed to neutrality to obtain AgCl solid and waste liquid.

[0029] Add clean water to the AgCl solid washed to neutrality, add hydrochloric acid from the hydrochloric acid metering tank 13 for slurry treatment, then add iron powder to replace the silver powder, and wash the silver powder to neutrality, then dry the silver powder and transfer it to the lifting medium frequency furnace 4 for ingot casting to obtain a high-purity silver ingot.

[0030] The liquid containing copper nitrate ions produced in the silver reactor 12 is filtered through the filter tank 16, enters the transfer tank 17, and is then pumped to the copper nitrate storage tank 18 and the copper nitrate reactor 19. Iron powder is added to the copper nitrate reactor 19, and after replacement, single sponge copper and waste liquid are obtained, and the waste liquid enters the wastewater treatment workshop.

[0031] like Figure 3As shown, there are two gold separation kettles 6 in the lead removal system; there are four silver reaction kettles 12, two filter tanks 16 and two transfer tanks 17, so that the silver reaction kettles 12 are connected to the same set of filter tanks 16 and transfer tanks 17 in pairs; there are two copper nitrate storage tanks 18. It should be noted that the number of equipment described in the lead removal system is not limited to Figure 3 As shown, the specific number can be flexibly set according to the actual requirements of the gold mud processing volume and processing efficiency. As long as the connection relationship of the additional equipment follows the workflow setting of the system, it is within the scope of protection of this application.

[0032] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud, characterized in that: The steps include: S1: Baking pretreatment: Baking the electrolytic gold mud from high-lead carbon slurry to remove moisture from the gold mud, burning and removing the powdered carbon in the gold mud, oxidizing most of the base metals in the gold mud and converting them into metal oxides; S2: pyrometallurgical smelting: the gold mud baked in step S1 is mixed with borax, sodium carbonate, and silicon dioxide smelting auxiliary materials, and then added into a rotary medium frequency furnace for smelting. Under the action of the slag-forming agent, the base metal oxides in the gold mud slag into the slag phase, and the gold, silver, copper, and lead metals enter the metal phase. After ingot casting, gold, silver, copper, and lead alloys and smelting slag are obtained. After the smelting slag is crushed, the valuable metals can be further recovered; S3: Gold-silver-copper-lead alloy splashing: the gold-silver-copper-lead alloy obtained in step S2 is added into a water-quenched splashing bucket to splash the alloy into flakes; S4: separation of gold, silver, copper and lead alloys, specifically including the following steps: S401: the flake alloy obtained in step S3 is transferred into a gold separation kettle, nitric acid and clean water are added to perform gold separation, and a supernatant and sponge gold are obtained; the supernatant is transferred to a transfer tank for the next step of processing; S402: The sponge gold obtained in step S401 is transferred to a primary separation reactor for lead removal, 4% to 5% sodium hydroxide solution is added, and the reaction is stirred for 2 to 3 hours. The lead dioxide in the sponge gold will be converted into Na2PbO3 which is easily soluble in water, and the impurity PbO2 is completely removed, thereby obtaining lead-free sponge gold and waste liquid; S403: The sponge gold obtained in step S402 is transferred to a secondary separation reactor, and the residual silver and copper metals in the sponge gold are removed at 100-200° C. to obtain a high-purity sponge gold with silver and copper removed and a mixed solution of silver nitrate, copper nitrate, and lead nitrate, and the sponge gold is dried and cast into an ingot to obtain a high-purity gold ingot; S404: The mixed solution of silver nitrate, copper nitrate and lead nitrate obtained in step S403 is transferred to a silver reaction kettle, and hydrochloric acid is added until Ag in the solution is reduced to 0. + , Pb 2+ After complete precipitation of AgCl and PbCl2, the supernatant is drawn out from the reactor, and clean water is added to wash the mixed solids until the washing liquid is neutral; S405: adding 9% to 10% acetic acid solution and 12% to 13% sodium acetate solution to the AgCl and PbCl2 mixed solid obtained in step S404, reacting for 2 to 3 hours, the PbCl2 in the AgCl will be converted into (CH3COO)2Pb which is easily soluble in water, removing the doped PbCl2, washing the AgCl solid to neutrality, and obtaining AgCl solid and waste liquid; S406: Add clean water to the AgCl solid washed to neutrality in step S405, add 20 kg of hydrochloric acid for slurry treatment, slowly add iron powder in a ratio of 3:1 by mass of silver metal to iron powder, stir and observe until no white precipitate remains in the silver powder, continue stirring for 60 minutes and then add 20 kg of hydrochloric acid, continue stirring for 60 minutes after the addition of hydrochloric acid, then stop stirring, wash the silver powder to neutrality, then bake it, melt and cast it to obtain a high-purity silver ingot; S407: The supernatant extracted in step S404 still contains a large amount of copper nitrate ions. These copper nitrate solutions are replaced by iron powder to obtain elemental sponge copper and waste liquid, which enters the wastewater treatment workshop.

2. The method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud according to claim 1 is characterized in that: The baking in step S1 is carried out at a temperature of 600-800° C. for 8 hours.

3. The method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud according to claim 1 is characterized in that: In step S2, the addition amounts of borax, sodium carbonate and silicon dioxide are 7% to 10%, 2% to 3% and 4% to 5% of the gold mud respectively.

4. The method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud according to claim 1 is characterized in that: In step S401, the addition ratio of the flake alloy to nitric acid is 1:3.0 to 1:3.

3.

5. The method for efficiently removing lead from high-lead gold-loaded carbon desorption electrolysis gold mud according to claim 1 is characterized in that: In step S404, the addition ratio of silver metal to hydrochloric acid is 1:

1.

6. A high-lead gold-loaded carbon desorption electrolysis gold mud high-efficiency lead removal system, characterized in that: The invention comprises a trolley furnace (1) and a rotating medium-frequency furnace (2) connected thereto, wherein the discharge port of the rotating medium-frequency furnace (2) is sequentially connected to a lifting medium-frequency furnace (4), a water-quenching bead-sprinkling bucket (5), a gold separation kettle (6), a primary separation reaction kettle (7) and a secondary separation reaction kettle (10), the reagent addition ports of the gold separation kettle (6) and the primary separation reaction kettle (7) are respectively connected to a nitric acid metering tank (8) and a sodium hydroxide metering tank (9), the discharge port of the secondary separation reaction kettle (10) is connected to a silver nitrate transfer tank (11), the discharge port of the silver nitrate transfer tank (11) is connected to a silver reaction kettle (12), the reagent addition port of the silver reaction kettle (12) is connected to a hydrochloric acid metering tank (13), an acetic acid metering tank (14) and a sodium acetate metering tank (15), and the discharge port of the silver reaction kettle (12) is sequentially connected to a filter tank (16), a transfer tank (17), a copper nitrate storage tank (18) and a copper nitrate reaction kettle (19).

7. The high-lead gold-loaded carbon desorption electrolysis gold mud efficient lead removal system according to claim 6 is characterized in that: The slag outlet of the rotary medium frequency furnace (2) is connected to a jaw crusher (3).

8. The high-lead gold-loaded carbon desorption electrolysis gold mud efficient lead removal system according to claim 6 is characterized in that: The gold separation kettle (6) is provided with more than two.

9. The high-lead gold-loaded carbon desorption electrolysis gold mud efficient lead removal system according to claim 6, characterized in that: The silver reaction kettles (12) are provided in two or more groups, and are connected to the same set of filter tanks (16) and transfer tanks (17) in pairs.

10. The high-lead gold-loaded carbon desorption electrolysis gold mud efficient lead removal system according to claim 6, characterized in that: The copper nitrate storage tanks (18) are provided with more than two.

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