Tubular leaching impurity removal method for lead-containing gold concentrate

Abstract

The invention relates to a tubular leaching impurity removal method for lead-containing gold concentrate, which comprises the following steps of: preparing the lead-containing gold concentrate into a material rod, and then infiltrating lining filter cloth by utilizing a circularly flowing hot hydrochloric acid solution to dissolve impurities such as lead and iron in mineral aggregate, so that semi-continuous leaching of production is realized; the total recovery rate of gold and silver and the recovery rate of lead can be improved while the lead removal rate, the iron removal rate and the purity of the obtained lead salt are guaranteed. Moreover, compared with the prior art, the tubular leaching device disclosed by the invention is adopted for leaching and impurity removal treatment, so that heating treatment before leaching treatment and filtering treatment after leaching treatment can be cancelled, further production links can be reduced, the production time is saved, and the production efficiency is greatly improved; in addition, the tubular leaching device disclosed by the invention is relatively convenient to charge and discharge, so that the difficulty of treating the lead-containing gold concentrate is reduced.

Description

Technical Field

[0001] The present invention relates to a gold smelting process, and in particular to a method for removing impurities from a lead-containing gold concentrate by tubular leaching. Background Art

[0002] Many gold mining companies use the Nelson concentrator beneficiation process. Nelson gravity separation can produce high-grade gold concentrate and low-grade tailings. The gold concentrate produced by some mines contains a large amount of impurities such as lead and iron, which makes it difficult to slag in the smelting process and difficult to process through pyrometallurgical smelting. At the same time, during the smelting process, the generation of lead vapor cannot be fundamentally removed, causing environmental pollution and damage to the health of operators.

[0003] In addition, in addition to Nelson re-selection concentrate and tailings, a large amount of medium ore with high grade but not reaching the concentrate grade will be produced during production. This part of the ore contains higher lead. No matter which conventional smelting method is used, it will cause pollution, and at the same time, the production efficiency is low and the production cost is high. The use of high-concentration, high-temperature hydrochloric acid pretreatment method is an effective means to solve the above problems. The conventional method is to use an oil bath to heat the glass reactor for stirring and leaching, and then use a filter to achieve liquid-solid separation. However, in the production process, due to the technical requirements of the glass reactor, a heating process from room temperature to high temperature and a cooling process from high temperature to room temperature after leaching is completed are required, resulting in a long working time cycle and low production efficiency. At the same time, a filtration process is required, which increases the process links, making the entire production process complicated and difficult to operate. Summary of the invention

[0004] The purpose of the present invention is to provide a method for tubular leaching and impurity removal of lead-containing gold concentrate to solve the problems of long working cycle, low production efficiency, complex production process and difficult operation in the prior art.

[0005] In order to achieve the above object, the present disclosure provides a method for treating lead-containing gold concentrate by tubular leaching and impurity removal, the method comprising: S1. Fill the lead-gold concentrate into a material bar barrel lined with filter cloth to form a material bar, and place the material bar barrel in a tubular leaching device; allow hydrochloric acid to enter an acid-proof reactor for heating to obtain a hot hydrochloric acid solution; allow washing water to enter a hot water reactor for heating to obtain hot washing water; S2, the hot hydrochloric acid solution is continuously introduced into the tubular leaching device, and flows through the material rod to contact the lead-containing gold concentrate for leaching and impurity removal treatment to obtain lead-containing acid liquid; the lead-containing acid liquid is returned to the acid-proof reactor to realize the circulation of the acid liquid in the acid-proof reactor; until the leaching and impurity removal treatment time reaches T 浸出 , go to step S3; S3, the hot washing water continuously enters the tubular leaching device and flows through the material rod for washing to obtain acid-containing washing water; the acid-containing washing water is returned to the hot water reactor to realize the circulation of the washing water in the hot water reactor; until the washing treatment time reaches T 洗涤 , ending the washing process and discharging the residual water in the tubular leaching device; S4, taking out the material barrel in the tubular leaching device, collecting the material in the material barrel to obtain lead-free gold concentrate, and returning to step S1.

[0006] Optionally, the lead content in the lead-gold concentrate is 10-50% by weight, the iron content is 5-30% by weight, and the gold content is 300-150000 g / t.

[0007] Optionally, the lead-containing gold concentrate includes gold concentrate and / or middlings obtained by Nelson gravity separation process; the gold content in the gold concentrate is 50,000-150,000 g / t; the gold content in the middlings is 300-50,000 g / t.

[0008] Optionally, step S1 also includes allowing the hydrochloric acid to enter the acid-proof reactor and mix with water and then heat to obtain the hot hydrochloric acid solution; the concentration of the hot hydrochloric acid solution is 6~12mol / L, and the temperature is above 95°C; the temperature of the hot washing water is above 90°C.

[0009] Optionally, the leaching and impurity removal treatment time T 浸出 The volume space velocity of the hot hydrochloric acid solution is 480~1600h -1 ; The time T of the washing process 洗涤 The volume space velocity of the hot washing water is 480~1600h -1 .

[0010] Optionally, the tubular leaching device comprises a tubular shell, a support limit plate, two flow guide supports and a material rod barrel; The tubular shell comprises an integrally arranged horizontal cylindrical shell, a feed side wall and a discharge side wall, wherein the horizontal cylindrical shell, the feed side wall and the discharge side wall form an internal chamber for liquid flow; the feed side wall is provided with a liquid inlet for injecting a leaching solution; the discharge side wall is provided with a liquid outlet and a cleaning outlet, wherein the liquid outlet is used to discharge the leaching solution after leaching, and the cleaning outlet is used to discharge clean waste water; an opening for a movable connection cover plate is provided on the horizontal cylindrical shell, which is used to be detachably connected to the movable connection cover plate; The two flow guide brackets are fixed below the movable connection portion along the radial direction of the tubular shell, so that the flow guide brackets can extend into the internal chamber along with the installation of the movable connection cover plate; material rod barrel limiting holes are provided at the relative positions of the two flow guide brackets for fixing the material rod barrel; The support limit plate is arranged on the inner wall of the internal chamber; the support limit plate is detachably sealed and connected to the flow guide support to divide the internal chamber of the tubular shell into a feed area, a leaching area and a discharge area; the leaching area is connected to the feed area through a material rod barrel; the leaching area is connected to the discharge area through a material rod barrel; The material rod barrel comprises a detachable material rod top cover, a material rod barrel shell and an inner lining filter cloth, wherein the inner lining filter cloth is arranged on the inner wall of the material rod top cover and the material rod barrel shell to form a material chamber for filling the gold concentrate.

[0011] Optionally, the number of material rod barrels in the tubular leaching device is 1 to 10; the diameter of the material rod barrel is 40 to 80 mm, the length is 250 to 330 mm, and the material filling weight is 0.5 to 1.5 kg.

[0012] Optionally, the material of the material rod top cover and the material rod barrel shell includes one or more of enamel, glass and polytetrafluoroethylene; the acid-proof reactor is selected from an enamel reactor, a glass reactor or a reactor lined with polytetrafluoroethylene; the method also includes using an acid-resistant pressure pump to achieve the circulation of acid or washing water.

[0013] Optionally, the method further includes: S5, allowing the lead-free gold concentrate to enter a silver separation smelting unit for gold and silver recovery processing to obtain recovered gold and recovered silver; allowing the lead-containing acid liquid in the acid-proof reactor to enter a lead recovery unit for lead recovery processing to obtain lead chloride; allowing the acid-containing washing water in the hot water reactor to enter a neutralization reaction unit for neutralization and then be discharged in compliance with the standards.

[0014] Optionally, step S5 also includes that the total recovery rate of gold and silver in the gold and silver recovery process is greater than 99 weight %.

[0015] Through the above technical solution, the present invention makes the lead-containing gold concentrate into a material rod, and then uses a circulating hot hydrochloric acid solution to penetrate the inner lining filter cloth to dissolve the impurities such as lead and iron in the ore, so as to achieve semi-continuous leaching in production, which can ensure the lead removal rate, iron removal rate and purity of the obtained lead salt while improving the total recovery rate of gold and silver and the recovery rate of lead. Moreover, compared with the prior art, the tubular leaching device disclosed in the present invention is used for leaching and impurity removal treatment, which can eliminate the heating treatment before the leaching treatment and the filtering treatment after the leaching treatment, thereby reducing the production links, saving production time, and greatly improving the production efficiency; in addition, the tubular leaching device disclosed in the present invention is relatively convenient for loading and unloading, which reduces the difficulty of processing the lead-containing gold concentrate.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The present invention is a schematic diagram of a tubular leaching and impurity removal system for lead-containing gold concentrate.

[0018] Figure 2 The present invention discloses a schematic diagram of a tubular leaching device.

[0019] Figure 3 It is a schematic diagram of a tubular shell of a tubular leaching device disclosed in the present invention.

[0020] Figure 4 It is a schematic diagram of a movable connection cover plate of a tubular leaching device disclosed in the present invention.

[0021] Figure 5 It is a schematic diagram of a material rod barrel of a tubular leaching device disclosed in the present invention.

[0022] Description of Reference Numerals 1 horizontal cylindrical shell; 2 movable connection cover plate; 3 disassembly and assembly handle; 4 feed side wall; 5 discharge side wall; 6 liquid inlet; 7 liquid outlet; 8 cleaning port; 9 bracket limit plate; 10 flow guide bracket; 11 material rod barrel; 12 movable connection cover plate opening; 13 material rod barrel limit hole; 14 lining filter cloth; 21 hydrochloric acid tank; 22 water storage tank; 23 acid-proof reactor; 24 hot water reactor; 25 PLC program control device; 26 switching valve; 27 tubular leaching device; 28 circulating pump; 29 check valve; 30 check valve. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] In the present disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of a device in normal use. Figure 2 In the drawing direction, "inside" and "outside" refer to the outline of the device. In the description of the present disclosure, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0025] like Figure 1 and Figure 2 As shown, the present disclosure provides a method for treating lead-containing gold concentrate by tubular leaching and impurity removal, the method comprising: S1, fill the lead-gold concentrate in the material rod barrel 11 lined with filter cloth to form a material rod, and place the material rod barrel 11 in the tubular leaching device 27; allow hydrochloric acid to enter the acid-proof reactor 23 for heating to obtain a hot hydrochloric acid solution; allow washing water to enter the hot water reactor 24 for heating to obtain hot washing water; S2, the hot hydrochloric acid solution is continuously introduced into the tubular leaching device 27, and flows through the material rod to contact the lead-containing gold concentrate for leaching and impurity removal treatment to obtain lead-containing acid liquid; the lead-containing acid liquid is returned to the acid-proof reactor 23 through the circulation pump 28, so that the acid liquid in the acid-proof reactor 23 circulates; until the leaching and impurity removal treatment time reaches T 浸出 , go to step S3; S3, the hot washing water continuously enters the tubular leaching device 27, and flows through the material rod for washing treatment to obtain acid-containing washing water; the acid-containing washing water is returned to the hot water reactor 24 through the circulation pump 28, so that the washing water in the hot water reactor 24 circulates; until the washing treatment time reaches T 洗涤 , ending the washing process and discharging the residual water in the tubular leaching device 27; S4, taking out the material barrel 11 in the tubular leaching device 27, and collecting the material in the material barrel 11 to obtain lead-free gold concentrate, and returning to step S1.

[0026] Through the above technical scheme, the present invention makes the lead-containing gold concentrate into a material rod, and then uses a circulating hot hydrochloric acid solution to penetrate the inner lining filter cloth to dissolve the impurities such as lead and iron in the ore, so as to achieve semi-continuous leaching in production, which can ensure the lead removal rate, iron removal rate and purity of the obtained lead salt while improving the total recovery rate of gold and silver and the recovery rate of lead. Moreover, compared with the prior art, the tubular leaching device 27 of the present invention is used for leaching and impurity removal treatment, which can eliminate the heating treatment before the leaching treatment and the filtering treatment after the leaching treatment, thereby reducing the production links, saving production time, and greatly improving the production efficiency; in addition, the tubular leaching device 27 of the present invention is relatively convenient for loading and unloading, which reduces the difficulty of processing the lead-containing gold concentrate.

[0027] In one embodiment, the tubular leaching and impurity removal system for treating lead-containing gold concentrate used in the present disclosure is as follows: Figure 1 As shown, the system includes a hydrochloric acid tank 21, an acid-proof reactor 23, a water storage tank 22, a switching valve 26, a hot water reactor 24 and a tubular leaching device 27; The outlet of the hydrochloric acid tank 21 is connected to the inlet of the acid-proof reactor 23 so that hydrochloric acid can enter the acid-proof reactor 23; the outlet of the water storage tank 22 is connected to the inlet of the hot water reactor 24 so that washing water can enter the hot water reactor 24; the outlet of the acid-proof reactor 23 or the outlet of the hot water reactor 24 is respectively connected to the inlet of the switching valve 26, and the outlet of the switching valve 26 is connected to the liquid inlet 6 of the tubular leaching device 27 so that acid or washing water can enter the tubular leaching device 27 for leaching and impurity removal treatment or washing treatment respectively; the liquid outlet 7 of the tubular leaching device 27 is respectively connected to the circulating acid liquid inlet of the acid-proof reactor 23 and the acid-containing washing water inlet of the hot water reactor 24.

[0028] In one embodiment, the hydrochloric acid tank 21 and the water storage tank 22 described in the present disclosure are conventionally selected in the art, and this application does not make any special requirements.

[0029] In one embodiment, the acid-proof reactor 23 described in the present disclosure is selected from an enamel reactor, a glass reactor or a conventional reactor lined with polytetrafluoroethylene.

[0030] In one embodiment, the hot water reactor 24 described in the present disclosure is selected from an enamel reactor, a glass reactor or a conventional reactor lined with polytetrafluoroethylene.

[0031] In one embodiment, the heat sources of the acid-proof reactor 23 and the hot water reactor 24 described in the present disclosure are conventionally selected in the art, and this application does not make special requirements. For example, they can be heated by a water bath or an oil bath.

[0032] In one embodiment, the acid-proof reactor 23 and the hot water reactor 24 are respectively provided with discharge ports for discharging acid solution and waste water respectively.

[0033] In one embodiment, the number of acid-proof reactors 23 and hot water reactors 24 in the system described in the present disclosure is 2 to 5 respectively.

[0034] In one embodiment, the method further includes, in order to realize the circulation of acid solution or washing water, a circulation pump 28 can be set on the liquid outlet pipeline of the tubular leaching device 27, wherein the circulation pump 28 is an acid-resistant pressure pump; or, it can be realized by vacuuming with an air compressor.

[0035] In one embodiment, the system further comprises a PLC program control device 25, which is electrically connected to a switching valve 26 to adjust the leaching and impurity removal time according to the time T of the leaching and impurity removal treatment. 浸出 and washing treatment time reaches T 洗涤 The inlet of the control switching valve 26 is connected to the outlet of the acid-proof reactor 23 or the outlet of the hot water reactor 24 .

[0036] In one embodiment, according to actual production needs, valves such as check valves, flow regulating valves and cut-off valves can be respectively arranged on each pipeline of the tubular leaching and impurity removal system to realize the flow direction of each logistics. For example, a check valve 29 is arranged on the outlet pipeline of the acid-proof reactor 23, and a check valve 30 is arranged on the outlet pipeline of the hot water reactor 24.

[0037] In one embodiment, the tubular leaching device 27 described in the present disclosure is as follows Figure 2 As shown, the tubular leaching device 27 includes a tubular housing, a support stop plate 9, two flow guide supports 10 and a material rod barrel 11; The tubular shell comprises an integrally arranged horizontal cylindrical shell 1, a feed side wall 4 and a discharge side wall 5, wherein the horizontal cylindrical shell 1, the feed side wall 4 and the discharge side wall 5 form an internal chamber for liquid flow; the feed side wall 4 is provided with a liquid inlet 6 for injecting a leaching solution; the discharge side wall 5 is provided with a liquid outlet 7 and a cleaning port 8, wherein the liquid outlet 7 is used to discharge the leaching solution after leaching, and the cleaning port 8 is used to discharge clean waste water; an opening for a movable connection cover plate is provided on the horizontal cylindrical shell 1, which is used to be detachably connected to the movable connection cover plate 2; The two flow guide brackets 10 are fixed below the movable connection portion along the radial direction of the tubular shell, so that the flow guide brackets 10 can extend into the internal chamber along with the installation of the movable connection cover plate 2; material rod barrel limiting holes are provided at the relative positions of the two flow guide brackets 10 for fixing the material rod barrel 11; The support limit plate 9 is arranged on the inner wall of the internal chamber; the support limit plate 9 is detachably sealed and connected to the flow guide support 10 to divide the internal chamber of the tubular shell into a feed area, a leaching area and a discharge area; the leaching area is connected to the feed area through a material rod barrel 11; the leaching area is connected to the discharge area through a material rod barrel 11; The material rod barrel 11 includes a detachable material rod top cover, a material rod barrel shell and an inner lining filter cloth. The inner lining filter cloth is arranged on the inner wall of the material rod top cover and the material rod barrel shell to form a material chamber for filling the gold concentrate.

[0038] In one embodiment, if Figure 3 As shown, the size of the tubular shell of the tubular leaching device can be determined according to the gold concentrate processing capacity. For example, the size of the tubular shell of the present disclosure includes: the outer diameter of the tubular shell is 50~100cm, and the length along the axial direction of the horizontal cylindrical shell 1 is 80~200cm.

[0039] In one embodiment, the tubular shell is made of stainless steel lined with an anti-corrosion material; wherein the anti-corrosion material includes polytetrafluoroethylene and / or enamel material.

[0040] In one embodiment, the thickness of the stainless steel of the tubular housing is 4-20 mm; the thickness of the anti-corrosion material of the tubular housing is 80-150 μm; In one embodiment, the movable cover opening 12 on the horizontal cylindrical shell 1 is a square opening, and the dimensions of the square opening include: a length along the axial direction of the horizontal cylindrical shell 1 of 27 to 35 cm, and a length perpendicular to the axial direction of 30 to 60 cm.

[0041] In one embodiment, the square opening can be set at the center of the horizontal cylindrical shell 1, that is, the square opening is at the same distance from the two sides of the horizontal cylindrical shell 1; it can also be set at a position close to the discharge side wall 5.

[0042] In one embodiment, a sealing gasket is provided in the contact area between the movable connection cover opening 12 of the horizontal cylindrical shell 1 and the movable connection cover 2 to prevent liquid leakage in the detachable tubular leaching device.

[0043] In one embodiment, a cover support is provided below the contact area between the movable cover opening 12 and the movable cover 2, for supporting the movable cover 2 to prevent the movable cover 2 from entering the internal chamber, and the cover support may be formed by an inner lining anti-corrosion material.

[0044] In one embodiment, the liquid inlet 6 is arranged at the lower part of the feed side wall 4; the liquid outlet 7 is arranged at the upper part of the discharge side wall 5, and the cleaning port 8 is arranged at the lower part of the discharge side wall 5. In this embodiment, by setting the positions of the liquid inlet 6 and the liquid outlet 7, the residence time of the leaching liquid or the washing liquid in the tubular leaching device can be increased, thereby improving the effect of the leaching treatment and the washing treatment. In addition, the setting of the cleaning port 8 can ensure that as much residual liquid as possible is discharged from the tubular leaching device when the residual liquid therein is discharged.

[0045] In one embodiment, a disassembly handle 3 is provided above the movable connection cover plate 2 for facilitating disassembly or installation of the movable connection cover plate 2 .

[0046] like Figure 4 As shown, the two flow guide brackets 10 are fixed below the movable connection cover plate 2 along the radial direction of the tubular shell, and the two flow guide brackets 10 are respectively fixed on both sides of the movable connection cover plate 2 along the axial direction of the tubular shell.

[0047] In one embodiment, the height of the flow guide bracket 10 is related to the size of the tubular shell, and the present application will not elaborate on this. It only needs to make the bottom surface of the flow guide bracket 10 sealed and connected to the inner wall of the tubular shell.

[0048] In one embodiment, the material rod barrel limiting holes 13 on the two flow guide brackets 10 are arranged in one-to-one correspondence, so that the material rod barrel 11 can be fixed at the same position of the two flow guide brackets 10, and multiple material rod barrels 11 can be parallel to each other.

[0049] In one embodiment, the internal chamber of the tubular shell can be divided into a feed zone, a leaching zone and a discharge zone by plugging or setting a seal. Specifically, if the plug-in method is adopted, a slot can be opened in the inner wall of the tubular shell and the contact area between the bracket limit plate 9 and the guide bracket 10, so that the guide bracket 10 is sealed and connected to the inner wall of the tubular shell and the bracket limit plate 9; if the seal is set, a sealing pad can be set on all the edges of the guide bracket 10 to avoid communication between the feed zone, the leaching zone and the discharge zone through gaps.

[0050] In one embodiment, the surfaces of the flow guide bracket 10 and the bracket limiting plate 9 are coated with an anti-corrosion material; wherein the anti-corrosion material includes polytetrafluoroethylene and / or enamel material.

[0051] In one embodiment, the thickness of the flow guide bracket 10 is 2-8 mm, and the thickness of the bracket limiting plate 9 is 2-8 mm.

[0052] like Figure 5 As shown, the material rod barrel shell and the material top cover are evenly provided with a plurality of penetration holes, wherein the ratio of the total surface area of ​​the penetration holes to the surface area of ​​the material rod barrel 11 is (0.6-0.75):1.

[0053] In one embodiment, the material of the material rod top cover and the material rod barrel shell are respectively made of acid-resistant materials, preferably one or more of polytetrafluoroethylene, enamel and titanium alloy.

[0054] In one embodiment, the inner lining filter cloth 14 is conventionally selected in the art, as long as it can be ensured that the inner lining filter cloth 14 has good acid resistance. For example, the inner lining filter cloth 14 used in the present disclosure includes an acid-resistant filter cloth, preferably a polyester long-fiber filter cloth.

[0055] In one embodiment, the material barrel 11 has a diameter of 40-80 mm, a length of 250-330 mm, and a material filling weight of 0.5-1.5 kg.

[0056] In one embodiment, the method for using the tubular leaching device 27 includes: Open the material rod top cover of the material rod barrel 11, fill the gold concentrate into the material chamber until the gold concentrate reaches the filling standard, and then cover the material rod top cover to complete the loading; wherein, the gold concentrate filled in the material chamber is called material rod; the filling standard is related to the volume of the material chamber, that is, the size of the material rod barrel 11; The filled material barrels 11 are fixed to the corresponding material barrel limiting holes on the two flow guide brackets 10 respectively, until all the material barrel limiting holes on the flow guide brackets 10 are fixed with the filled material barrels 11; The movable connecting cover plate 2 is installed at the movable connecting cover plate opening of the horizontal cylindrical shell 1, so that the guide bracket 10 carries the material rod barrel 11 and extends into the internal chamber as the movable connecting cover plate 2 is installed, and the bracket limit plate 9 is sealed and connected to the guide bracket 10, thereby dividing the internal chamber of the tubular shell into a feeding area, a leaching area and a discharging area; at this time, the leaching area is connected to the feeding area only through the material rod barrel 11, and the leaching area is connected to the discharging area only through the material rod barrel 11.

[0057] In this embodiment, when performing step S2, the hot hydrochloric acid solution enters the feeding area from the liquid inlet 6 until the liquid level in the feeding area exceeds the lowest material rod barrel 11, and the hot hydrochloric acid solution penetrates into the interior of the material rod barrel 11 through the inner lining filter cloth of the lowest material rod barrel 11, and contacts the material rod, which can dissolve impurities such as lead and iron in the material rod in the hot hydrochloric acid solution to obtain lead-containing acid liquid, and the lead-containing acid liquid enters the leaching area. Since the feeding rate of the hot hydrochloric acid solution is greater than the penetration rate, the liquid level in the feeding area gradually rises until all the material rod barrels 11 can be permeated with liquid, and the liquid level in the leaching area also gradually rises. When the liquid level in the leaching area exceeds the lowest material rod barrel 11, through the same osmosis, the lead-containing acid liquid in the leaching area can not only penetrate into all the material rod barrels 11 to complete the leaching process, but also some of the lead-containing acid liquid enters the discharging area until the liquid level in the discharging area rises to the liquid outlet 7, so that the acid liquid can be circulated to achieve the purpose of circulating the acid liquid. When the step S3 is performed, the circulation mode of the washing water is the same as that of the hot hydrochloric acid solution, which will not be described in detail here. When the washing process in step S3 is completed, the residual liquid (part of the washing water after the washing process) in the tubular leaching device 27 can be discharged through the cleaning port 8.

[0058] In one embodiment, the number of material rod barrels 11 that can be provided in the tubular leaching device 27 is 1 to 10. The ratio of the length of the material rod barrel 11 to the distance between the two flow guide brackets 10 is (1 to 1.1):1.

[0059] In one embodiment, the material barrel 11 has a diameter of 40-80 mm, a length of 250-330 mm, and a material filling weight of 0.5-1.5 kg.

[0060] In one embodiment, the main impurities in the lead-containing gold concentrate described in the present disclosure are lead and iron, wherein the lead content is 10-50% by weight and the iron content is 5-30% by weight.

[0061] In one embodiment, the gold content in the lead-gold concentrate described in the present disclosure is 300~150000g / t.

[0062] In one embodiment, the lead-containing gold concentrate described in the present disclosure includes gold concentrate and middlings obtained by Nelson gravity separation process or other gold concentrates with higher lead content, preferably gold concentrate and / or middlings obtained by Nelson gravity separation process.

[0063] In one embodiment, the gold content in the gold concentrate obtained by the Nelson gravity separation process is 50,000-150,000 g / t, the silver content is 25,000-80,000 g / t, the lead content is 10-50% by weight, and the iron content is 5-30% by weight; the gold content in the middling ore obtained by the Nelson gravity separation process is 300-50,000 g / t, the silver content is 300-50,000 g / t, the lead content is 10-50% by weight, and the iron content is 5-30% by weight.

[0064] In one embodiment, step S1 further includes allowing the hydrochloric acid to enter the acid-proof reactor 23 and mix with water and then heat to obtain the hot hydrochloric acid solution; wherein the concentration of the hot hydrochloric acid solution is 6-12 mol / L and the temperature is above 95°C.

[0065] In one embodiment, the temperature of the hot washing water is above 90°C.

[0066] In one embodiment, the conditions for the leaching and impurity removal treatment include: the time T of the leaching and impurity removal treatment 浸出 The volume space velocity of the hot hydrochloric acid solution is 480~1600h -1 , preferably 1000~1200h -1 .

[0067] In one embodiment, the washing process conditions include: the washing process time T 洗涤 The volume space velocity of the hot washing water is 480~1600h -1 , preferably 1000~1200h -1 .

[0068] In one embodiment, a heat preservation device is provided on each pipeline of the system disclosed herein so that the temperature drop of the hydrochloric acid solution or the washing water can be maintained below 10° C. during the circulation process.

[0069] In one embodiment, the hot hydrochloric acid solution in the acid-proof reactor 23 is circulated in batches of 2 to 10 batches. In this embodiment, the volume of the hot hydrochloric acid solution in the acid-proof reactor 23 in the initial stage is recorded, and the volume of the hot hydrochloric acid solution delivered to the tubular leaching device 27 can be calculated according to the volume space velocity and time of the leaching and impurity removal treatment, until the calculated volume of the hot hydrochloric acid solution delivered to the tubular leaching device 27 is the same as the volume of the hot hydrochloric acid solution in the acid-proof reactor 23 in the initial stage, it is considered that one batch is completed.

[0070] In one embodiment, the hot hydrochloric acid solution configured in the acid-proof reactor 23 can participate in the leaching and impurity removal treatment of 2 to 5 batches of lead-containing gold concentrate. It should be noted that the multiple material rods formed in step S1 are subjected to steps S1 to S4 to obtain lead-free gold concentrate, and at this time, the leaching and impurity removal treatment of a batch of lead-containing gold concentrate is considered to be completed.

[0071] In one embodiment, the acid liquid after completing 2 to 5 batches in the acid-proof reactor 23 is discharged to the acid liquid subsequent treatment unit through the discharge port of the acid-proof reactor 23.

[0072] In one embodiment, after completing step S3, the residual water in the tubular leaching device 27 is discharged to the neutralization reaction unit through the cleaning port 8, and the washing water in the hot water reactor 24 is discharged to the neutralization reaction unit through the discharge port.

[0073] In one embodiment, the method further comprises: S5, allowing the lead-free gold concentrate to enter the silver separation smelting unit for gold and silver recovery treatment to obtain recovered gold and recovered silver; The lead-containing acid liquid in the acid-proof reaction kettle 23 enters the lead recovery unit for lead recovery treatment to obtain lead chloride; The acid-containing washing water in the hot water reactor 24 is fed into the neutralization reaction unit for neutralization and then discharged in compliance with the standards.

[0074] In one embodiment, the method for gold and silver recovery and processing is a conventional method in the art, and no special requirements are made in the art. For example, a conventional refining process can be used.

[0075] In a specific embodiment, the conventional refining process includes: First, silver is added according to 3 times the total amount of gold, and a small amount of slag-forming agent is added to carry out gold smelting. After smelting, the slag is removed, and the molten metal phase is poured into beads. Then, nitric acid is used to separate the gold and silver. Sodium chloride or hydrochloric acid is added to the solution to precipitate silver, and then the silver product is obtained through reduction-smelting-ingot casting. The nitric acid leaching slag is used to dissolve the gold with aqua regia or chloride leaching, and then the gold product is obtained through filtration-reduction-washing-drying-ingot casting.

[0076] In one embodiment, the gold recovery rate of the gold and silver recovery process is greater than 99% by weight.

[0077] In one embodiment, the lead recovery process includes: subjecting the lead-containing acid solution to cooling and crystallizing treatment and then filtering it in a filtration device to obtain lead chloride and filtrate. The conditions of the cooling and crystallizing treatment include: cooling to room temperature (20° C.); and the purity of the obtained lead chloride is above 90% by weight.

[0078] In one embodiment, the neutralization described in step S5 includes: allowing the filtrate obtained from the lead recovery treatment, the washing water in the hot water reactor 24, and the residual water discharged from the tubular leaching device 27 to enter the neutralization reaction device and contact with the alkali for neutralization reaction to obtain neutralized wastewater with a pH value of 6 to 8; filtering the neutralized wastewater and storing the obtained filter residue, and the obtained filtrate is the wastewater that can meet the discharge standards.

[0079] In one embodiment, if Figure 1 and Figure 2 As shown, the method for removing impurities from lead-containing gold concentrate by tubular leaching includes: S1, filling the lead-gold concentrate into a material rod barrel 11 lined with filter cloth to form a material rod, and placing the material rod barrel 11 in a tubular leaching device 27; Allow hydrochloric acid to enter the acid-proof reaction kettle 23 and mix with water to obtain a hydrochloric acid solution with a concentration of 6 to 12 mol / L, and then heat it to obtain a hot hydrochloric acid solution with a temperature of more than 95° C.; The washing water is heated in the hot water reactor 24 to obtain hot washing water with a temperature of more than 90°C; S2, the hot hydrochloric acid solution is continuously introduced into the tubular leaching device 27, and flows through the material rod to contact the lead-containing gold concentrate for leaching and impurity removal treatment to obtain lead-containing acid liquid; the lead-containing acid liquid is returned to the acid-proof reactor 23 to realize the circulation of the acid liquid in the acid-proof reactor 23; until the time T of the leaching and impurity removal treatment is reached 浸出 , go to step S3; the leaching and impurity removal treatment time reaches T 浸出 The volume space velocity of the hot hydrochloric acid solution is 480~1600h -1 ; S3, the hot washing water continuously enters the tubular leaching device 27, and flows through the material rod for washing treatment to obtain acid-containing washing water; the acid-containing washing water is returned to the hot water reactor 24 to realize the circulation of the washing water in the hot water reactor 24; until the washing treatment time reaches T 洗涤 , end the washing process and discharge the residual water in the tubular leaching device 27; the washing process time T 洗涤The volume space velocity of the hot washing water is 480~1600h -1 ; S4, taking out the material barrel 11 in the tubular leaching device 27, and collecting the material in the material barrel 11 to obtain lead-free gold concentrate, and returning to step S1; S5, allowing the lead-free gold concentrate to enter the silver separation smelting unit for gold and silver recovery treatment to obtain recovered gold and recovered silver; The lead-containing acid liquid in the acid-proof reaction kettle 23 enters the lead recovery unit for lead recovery treatment to obtain lead chloride; The acid-containing washing water in the hot water reactor 24 is fed into the neutralization reaction unit for neutralization and then discharged in compliance with the standards.

[0080] The present disclosure is further described below by way of examples, but the present disclosure is not limited thereby. The lead-containing gold concentrate used in the present disclosure is a mixed gold concentrate formed by gold concentrate and middlings obtained by the Nelson gravity separation process, and its properties are shown in Table 1.

[0081] Table 1 Parameters of lead-gold concentrate

[0082] Example 1 Tubular leaching and impurity removal system for lead-containing gold concentrate Figure 1 As shown, the number of acid-proof reactors 23 is 3, and the number of hot water reactors 24 is 2; the tubular leaching device 27 used in the system is as shown in Figure 2 As shown; wherein, the number of material rod barrels 11 is 6, the diameter of the material rod barrel 11 is 60mm, the length is 300mm, and the material filling weight is 1kg; The method of tubular leaching and impurity removal of lead-containing gold concentrate includes: S1, filling the lead-gold concentrate into a material rod barrel 11 lined with filter cloth to form a material rod, and placing the material rod barrel 11 in a tubular leaching device 27; The hydrochloric acid is introduced into the acid-proof reaction kettle 23 and mixed with water to obtain a hydrochloric acid solution having a concentration of 8 mol / L, and then heated to obtain a hot hydrochloric acid solution having a temperature of 98° C.; The washing water is allowed to enter the hot water reactor 24 for heating to obtain hot washing water with a temperature of 95°C; S2, the hot hydrochloric acid solution is continuously introduced into the tubular leaching device 27, and flows through the material rod to contact the lead-containing gold concentrate for leaching and impurity removal treatment to obtain lead-containing acid liquid; the lead-containing acid liquid is returned to the acid-proof reactor 23 to realize the circulation of the acid liquid in the acid-proof reactor 23; until the leaching and impurity removal treatment time reaches T 浸出 , go to step S3; the leaching and impurity removal treatment time reaches T 浸出The volume space velocity of the hot hydrochloric acid solution is 800h -1 ; S3, the hot washing water continuously enters the tubular leaching device 27, and flows through the material rod for washing treatment to obtain acid-containing washing water; the acid-containing washing water is returned to the hot water reactor 24 to realize the circulation of the washing water in the hot water reactor 24; until the washing treatment time reaches T 洗涤 , end the washing process and discharge the residual water in the tubular leaching device 27; the washing process time T 洗涤 The volume space velocity of the hot washing water is 1200h -1 ; S4, taking out the material barrel 11 in the tubular leaching device 27, and collecting the material in the material barrel 11 to obtain lead-free gold concentrate, and returning to step S1; S5, allowing the lead-free gold concentrate to enter the silver separation smelting unit for gold and silver recovery treatment to obtain recovered gold and recovered silver; The lead-containing acid solution after three batches of circulation in the acid-proof reactor 23 is subjected to cooling crystallization treatment and then to filtration in a filtering device to obtain lead chloride and filtrate; wherein the conditions of the cooling crystallization treatment include: cooling to room temperature (20° C.); the purity of the obtained lead chloride is 98% by weight; The filtrate obtained from the lead recovery treatment, the washing water in the hot water reactor 24, and the residual water discharged from the tubular leaching device 27 are brought into a neutralization reaction device to contact with alkali for neutralization reaction to obtain neutralized wastewater with a pH value of 6 to 8; the neutralized wastewater is filtered and the obtained filter residue is stored, and the obtained filtrate is the wastewater that can meet the discharge standards.

[0083] The effect of the above method is shown in Table 2.

[0084] Example 2 The tubular leaching and impurity removal system for lead-containing gold concentrate is the same as that in Example 1, except that the number of acid-proof reactors 23 is 4, and the number of hot water reactors 24 is 2; The method for removing impurities from the lead-containing gold concentrate by tubular leaching is the same as that in Example 1, except that the concentration of the hot hydrochloric acid solution is 10 mol / L and the temperature is 95°C; The leaching and impurity removal treatment time reaches T 浸出 The volume space velocity of the hot hydrochloric acid solution is 800h -1 ; The time T of the washing treatment 洗涤 The volume space velocity of the hot washing water is 1000h -1 ; The lead-containing acid solution in the acid-proof reactor 23 is circulated for 5 batches before subsequent treatment.

[0085] The effect of the above method is shown in Table 2.

[0086] Example 3 The tubular leaching and impurity removal system for lead-containing gold concentrate is the same as that in Example 1, except that the number of acid-proof reactors 23 is 2, and the number of hot water reactors 24 is 2; The method for tubular leaching and impurity removal of lead-containing gold concentrate is the same as that in Example 1, except that the leaching and impurity removal treatment time reaches T 浸出 is 0.5h, and the volume space velocity of the hot hydrochloric acid solution is 1000h -1 ; The time T of the washing treatment 洗涤 The volume space velocity of the hot washing water is 1200h -1 ; The lead-containing acid solution in the acid-proof reactor 23 is circulated for 8 batches before subsequent treatment.

[0087] The effect of the above method is shown in Table 2.

[0088] Comparative Example 1 The method for removing impurities from a lead-containing gold concentrate comprises: placing the lead-containing gold concentrate in an anti-corrosion reactor and contacting it with a hydrochloric acid solution with a concentration of 8 mol / L, then heating it to a temperature of 98° C. and reacting it at the temperature for 1 hour to obtain a leaching product; filtering the leaching product through a filtering device to obtain a lead-removed gold concentrate and a first filtrate; The lead-free gold concentrate is placed in a hot water reactor 24 to contact with washing water, and then heated to a temperature of 95° C. and washed at the temperature for 20 minutes to obtain a washed product; the washed product is filtered through a filtering device to obtain a washed gold concentrate and a second filtrate; The washed gold concentrate enters a silver separation smelting unit for gold and silver recovery processing to obtain recovered gold and recovered silver; The first filtrate is cooled and crystallized and then passed into a filtration device for filtration to obtain lead chloride and a third filtrate; The third filtrate and the second filtrate are sent into a neutralization reaction device to contact with alkali for neutralization reaction to obtain neutralized wastewater with a pH value of 6 to 8; the neutralized wastewater is filtered and the obtained filter residue is stored, and the obtained filtrate is the wastewater that can meet the discharge standards.

[0089] The effect of the above method is shown in Table 2.

[0090] Table 2 Effects of Examples and Comparative Examples

[0091] in, Lead removal rate = (1-lead content in leached residue / lead content in raw materials) × 100%; Iron removal rate = (1-iron content of leached slag / iron content of raw materials) × 100%; Total recovery rate of gold and silver = (weight of gold and silver in leached slag / weight of gold and silver in raw materials) × 100%; Lead recovery rate = (1-recovered lead chloride weight / raw material lead weight) × 100%; As shown in Table 2, according to the comparison of the data in Examples 1 to 3 and Comparative Example 1, it can be seen that the method disclosed in the present invention can ensure the lead removal rate, iron removal rate and purity of the obtained lead salt while improving the total recovery rate of gold and silver and the recovery rate of lead. Specifically, the lead removal rate is at least 95%, the iron removal rate is at least 72%, the gold and silver recovery rates are at least 99.5%, the purity of lead chloride is 98%, and the lead recovery rate is at least 75%. In addition, the tubular leaching device disclosed in the present invention can, on the one hand, cancel the heating treatment before the leaching treatment and the filtering treatment after the leaching treatment, reduce the production links, save production time, and greatly improve the production efficiency; on the other hand, the tubular leaching device disclosed in the present invention is relatively convenient to add and unload, reducing the difficulty of processing lead-containing gold concentrate.

[0092] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0093] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0094] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for removing impurities from a lead-containing gold concentrate by tubular leaching, characterized in that: The method includes: S1. Fill the lead-gold concentrate into a material bar barrel lined with filter cloth to form a material bar, and place the material bar barrel in a tubular leaching device; allow hydrochloric acid to enter an acid-proof reactor for heating to obtain a hot hydrochloric acid solution; allow washing water to enter a hot water reactor for heating to obtain hot washing water; S2, the hot hydrochloric acid solution is continuously introduced into the tubular leaching device, and flows through the material rod to contact the lead-containing gold concentrate for leaching and impurity removal treatment to obtain lead-containing acid liquid; the lead-containing acid liquid is returned to the acid-proof reactor to realize the circulation of the acid liquid in the acid-proof reactor; until the leaching and impurity removal treatment time reaches T 浸出 , go to step S3; S3, the hot washing water continuously enters the tubular leaching device and flows through the material rod for washing to obtain acid-containing washing water; the acid-containing washing water is returned to the hot water reactor to realize the circulation of the washing water in the hot water reactor; until the washing treatment time reaches T 洗涤 , ending the washing process and discharging the residual water in the tubular leaching device; S4, taking out the material barrel in the tubular leaching device, collecting the material in the material barrel to obtain lead-free gold concentrate, and returning to step S1.

2. The method according to claim 1, characterized in that The lead content of the lead-containing gold concentrate is 10-50% by weight, the iron content is 5-30% by weight, and the gold content is 300-150000 g / t.

3. The method according to claim 1, characterized in that The lead-containing gold concentrate includes gold concentrate and / or middlings obtained by Nelson gravity separation process; The gold content in the gold concentrate is 50,000-150,000 g / t; the gold content in the middling ore is 300-50,000 g / t.

4. The method according to claim 1, characterized in that: Step S1 also includes allowing the hydrochloric acid to enter the acid-proof reactor and mix with water and then heat to obtain the hot hydrochloric acid solution; The hot hydrochloric acid solution has a concentration of 6-12 mol / L and a temperature of above 95°C; The temperature of the hot washing water is above 90°C.

5. The method according to claim 1, characterized in that The time T of the leaching and impurity removal treatment 浸出 The volume space velocity of the hot hydrochloric acid solution is 480~1600h -1 ; The time T of the washing process 洗涤 The volume space velocity of the hot washing water is 480~1600h -1 .

6. The method according to claim 1, characterized in that The tubular leaching device comprises a tubular shell, a support limit plate, two flow guide supports and a material rod barrel; The tubular shell comprises an integrally arranged horizontal cylindrical shell, a feed side wall and a discharge side wall, wherein the horizontal cylindrical shell, the feed side wall and the discharge side wall form an internal chamber for liquid flow; the feed side wall is provided with a liquid inlet for injecting a leaching solution; the discharge side wall is provided with a liquid outlet and a cleaning outlet, wherein the liquid outlet is used to discharge the leaching solution after leaching, and the cleaning outlet is used to discharge clean waste water; an opening for a movable connection cover plate is provided on the horizontal cylindrical shell, which is used to be detachably connected to the movable connection cover plate; The two flow guide brackets are fixed below the movable connection portion along the radial direction of the tubular shell, so that the flow guide brackets can extend into the internal chamber along with the installation of the movable connection cover plate; material rod barrel limiting holes are provided at the relative positions of the two flow guide brackets for fixing the material rod barrel; The support limit plate is arranged on the inner wall of the internal chamber; the support limit plate is detachably sealed and connected to the flow guide support to divide the internal chamber of the tubular shell into a feed area, a leaching area and a discharge area; the leaching area is connected to the feed area through a material rod barrel; the leaching area is connected to the discharge area through a material rod barrel; The material rod barrel comprises a detachable material rod top cover, a material rod barrel shell and an inner lining filter cloth, wherein the inner lining filter cloth is arranged on the inner wall of the material rod top cover and the material rod barrel shell to form a material chamber for filling the gold concentrate.

7. The method according to claim 1, characterized in that The number of material rod barrels in the tubular leaching device is 1 to 10; The material barrel has a diameter of 40-80 mm, a length of 250-330 mm, and a material filling weight of 0.5-1.5 kg.

8. The method according to claim 1, characterized in that The material of the material rod top cover and the material rod barrel shell includes one or more of enamel, glass and polytetrafluoroethylene; The acid-proof reactor is selected from an enamel reactor, a glass reactor or a reactor lined with polytetrafluoroethylene; The method also includes using an acid-resistant pressure pump to achieve the circulation of the acid solution or the washing water.

9. The method according to claim 1, characterized in that: The method further includes: S5, allowing the lead-free gold concentrate to enter the silver separation smelting unit for gold and silver recovery treatment to obtain recovered gold and recovered silver; The lead-containing acid liquid in the acid-proof reaction kettle enters a lead recovery unit for lead recovery treatment to obtain lead chloride; The acid-containing washing water in the hot water reactor is allowed to enter the neutralization reaction unit for neutralization and then discharged in compliance with the standards.

10. The method according to claim 9, characterized in that Step S5 also includes that the total recovery rate of gold and silver in the gold and silver recovery process is above 99 weight %.

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