Tubular leaching device for treating lead-containing gold concentrate

Abstract

The utility model relates to a tubular leaching device for treating lead-containing gold concentrate. According to the tubular leaching device, the gold concentrate can be filled in a material rod barrel to form a material rod; a hot hydrochloric acid solution enters the feeding area from the liquid inlet, permeates into the material rod barrel through the lining filter cloth of the material rod barrel and makes contact with the material rods, impurities such as lead and iron in the material rods can be dissolved in the hot hydrochloric acid solution, and lead-acid-containing liquid sequentially enters the leaching area and the discharging area till the liquid level in the discharging area rises to the liquid outlet. And circulating the acid liquor. According to the tubular leaching device, the permeation leaching principle is adopted, and the relative position of the material is fixed, so that compared with the conventional reaction kettle-filter process, the tubular leaching device does not need a filtering process, only needs to replace the material at regular time, reduces the production links, saves the production time, realizes the semi-continuity of production, and greatly improves the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gold smelting, specifically to a tubular leaching device for processing lead-containing gold concentrate. Background Technology

[0002] Many gold mining companies employ Nelson gravity separation processes. Nelson gravity separation yields high-grade gold concentrate and low-grade tailings. However, some mines produce gold concentrates containing high levels of impurities such as lead and iron, making slag formation during smelting difficult and hindering processing via pyrometallurgical methods. Furthermore, the generation of lead vapors during smelting cannot be completely eliminated, causing environmental pollution and harm to the health of operators.

[0003] In addition to Nelson gravity concentrate and tailings, production also generates a large amount of middlings that are of higher grade than concentrate. This middlings have a higher lead content, causing pollution regardless of the conventional smelting method used, while also resulting in low production efficiency and high costs. Using high-concentration, high-temperature hydrochloric acid pretreatment is an effective way to solve these problems. The conventional method involves stirring and leaching in an oil bath-heated glass reactor, followed by liquid-solid separation via a filter. However, the technical requirements of the glass reactor necessitate a heating process from room temperature to high temperature and a cooling process from high temperature to room temperature after leaching, leading to a long working cycle and low production efficiency. Furthermore, the filtration process adds steps, making the entire production process complex and difficult to operate. Utility Model Content

[0004] The purpose of this invention is to provide a tubular leaching device for processing lead-gold concentrate, in order to solve the problems of long working cycle, low production efficiency, complex production process and difficulty in operation in the existing technology.

[0005] To achieve the above objectives, this utility model provides a tubular leaching device for processing lead-gold concentrate. The tubular leaching device includes a tubular shell, a support limiting plate, two flow guide supports, and a material rod barrel.

[0006] The tubular shell includes an integrally formed horizontal cylindrical shell, an inlet sidewall, and an outlet sidewall, which together form an internal chamber for liquid flow. The inlet sidewall has an inlet for injecting the leaching solution. The outlet sidewall has an outlet and a cleaning port. The outlet is used to discharge the leaching solution after leaching, and the cleaning port is used to discharge cleaning wastewater. The horizontal cylindrical shell has an opening for a movable connecting cover plate for detachable connection.

[0007] Two flow guide brackets are fixed radially below the movable connecting cover plate along the tubular shell, so that the flow guide brackets can extend into the internal cavity as the movable connecting cover plate is installed; material rod barrel limiting holes are provided at the relative positions of the two flow guide brackets for fixing the material rod barrel;

[0008] The bracket limiting plate is disposed on the inner wall of the internal chamber; the bracket limiting plate is detachably and sealed to the flow guide bracket to divide the internal chamber of the tubular shell into a feeding zone, a leaching zone and a discharging zone; the leaching zone is connected to the feeding zone through a material bar barrel; the leaching zone is connected to the discharging zone through a material bar barrel.

[0009] The material rod barrel includes a detachable material rod top cover, a material rod barrel shell, and an inner filter cloth lining. The inner filter cloth is disposed on the inner wall of the material rod top cover and the material rod barrel shell, forming a material chamber for filling the gold concentrate.

[0010] Optionally, the tubular shell is made of stainless steel with an inner anti-corrosion lining; the surfaces of the support limiting plate and the flow guide support are covered with anti-corrosion material; the anti-corrosion material includes polytetrafluoroethylene and / or enamel material.

[0011] Optionally, the stainless steel thickness of the tubular shell is 4~20mm; the thickness of the anti-corrosion material of the tubular shell is 80~150μm.

[0012] Optionally, a sealing gasket is provided in the area where the opening of the movable connecting cover of the horizontal cylindrical shell contacts the movable connecting cover to prevent liquid leakage from the tubular leaching device.

[0013] Optionally, the area where the bracket limiting plate contacts the flow guide bracket is provided with a slot so that the flow guide bracket and the bracket limiting plate can be inserted into each other.

[0014] Optionally, the liquid inlet is located at the lower part of the feed sidewall; the liquid outlet is located at the upper part of the discharge sidewall; and the cleaning port is located at the lower part of the discharge sidewall.

[0015] Optionally, the number of material rod barrels in the tubular leaching device is 1 to 10.

[0016] Optionally, the material of the top cover of the material bar and the shell of the material bar are respectively one or more of polytetrafluoroethylene, enamel and titanium alloy; the inner filter cloth includes acid-resistant filter cloth.

[0017] Optionally, the diameter of the material bar is 40~80mm and the length is 250~330mm; the ratio of the length of the material bar to the distance between the two detachable supports is (1~1.1):1.

[0018] Optionally, the material rod barrel shell and the material rod top cover are provided with a plurality of permeation ports; the ratio of the total surface area of ​​the permeation ports to the surface area of ​​the material rod barrel is (0.6~0.75):1.

[0019] Through the above technical solution, the tubular leaching device of this utility model allows gold concentrate to be filled into a material rod barrel to form material rods. Hot hydrochloric acid solution enters the feeding zone through the inlet and permeates into the interior of the material rod barrel through the inner lining filter cloth, contacting the material rods. This dissolves impurities such as lead and iron in the material rods in the hot hydrochloric acid solution, resulting in a lead-containing acid solution that sequentially enters the leaching zone and the discharge zone until the liquid level in the discharge zone rises to the outlet, circulating the acid solution. Using this tubular leaching device, due to the use of the permeation leaching principle, the relative position of the material remains stationary. Therefore, compared with the conventional reactor-filter process, no filtration step is required; only periodic material replacement is needed, reducing production steps, saving production time, achieving semi-continuous production, and greatly improving production efficiency.

[0020] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of a tubular leaching device for lead-gold concentrate according to this utility model.

[0023] Figure 2 This is a schematic diagram of the tubular shell of the tubular leaching device of this utility model.

[0024] Figure 3 This is a schematic diagram of the movable connecting cover plate of the tubular leaching device of this utility model.

[0025] Figure 4 This is a schematic diagram of the material rod tank of the tubular leaching device of this utility model.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Horizontal cylindrical shell; 2. Movable connecting cover plate; 3. Disassembly handle; 4. Feed side wall; 5. Discharge side wall; 6. Liquid inlet; 7. Liquid outlet; 8. Cleaning port; 9. Support limiting plate; 10. Flow guide support; 11. Material rod barrel; 12. Opening of movable connecting cover plate; 13. Material rod barrel limiting hole; 14. Inner filter cloth. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0029] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its normal operating state, for example, referring to... Figure 1 In the drawing orientation, "inner" and "outer" refer to the orientation relative to the outline of the device. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0030] like Figure 1 As shown, this utility model provides a tubular leaching device for processing lead-gold concentrate. The tubular leaching device includes a tubular shell, a support limiting plate 9, two flow guide supports 10, and a material rod barrel 11.

[0031] The tubular shell includes an integrally formed horizontal cylindrical shell 1, a feed sidewall 4, and a discharge sidewall 5, which together form an internal chamber for liquid flow. The feed sidewall 4 has a liquid inlet 6 for injecting the leaching solution. The discharge sidewall 5 has a liquid outlet 7 and a cleaning outlet 8. The liquid outlet 7 is used to discharge the leaching solution after leaching, and the cleaning outlet 8 is used to discharge cleaning wastewater. The horizontal cylindrical shell 1 has a movable connecting cover opening 12 for detachable connection with the movable connecting cover 2 to facilitate replacement and installation of the material rod barrel 11.

[0032] Two flow guide brackets 10 are fixed radially below the movable connecting cover plate 2 along the tubular shell, so that the flow guide brackets 10 can extend into the internal cavity as the movable connecting cover plate 2 is installed; material rod barrel limiting holes 13 are provided at the relative positions of the two flow guide brackets 10 for fixing the material rod barrel 11;

[0033] The bracket limiting plate 9 is disposed on the inner wall of the internal chamber; the bracket limiting plate 9 is detachably and sealed to the flow guide bracket 10 to divide the internal chamber of the tubular shell into a feeding area, a leaching area and a discharging area; the leaching area and the feeding area are connected through a material bar barrel 11; the leaching area and the discharging area are connected through a material bar barrel 11.

[0034] The material rod barrel 11 includes a detachable material rod top cover, a material rod barrel shell, and an inner filter cloth 14. The inner filter cloth 14 is disposed on the inner wall of the material rod top cover and the material rod barrel shell, forming a material chamber for filling the gold concentrate.

[0035] Through the above technical solution, the tubular leaching device of this utility model allows gold concentrate to be filled into a material rod barrel 11 to form material rods. Hot hydrochloric acid solution enters the feeding zone through the inlet 6 and permeates into the interior of the material rod barrel 11 through the inner lining filter cloth 14, contacting the material rods. This dissolves impurities such as lead and iron in the material rods in the hot hydrochloric acid solution, resulting in a lead-containing acid solution that sequentially enters the leaching zone and the discharge zone until the liquid level in the discharge zone rises to the outlet 7, circulating the acid solution. Using this tubular leaching device, due to the use of the permeation leaching principle, the relative position of the material remains stationary. Therefore, compared with the conventional reactor-filter process, no filtration step is required; only periodic material replacement is needed, reducing production steps, saving production time, achieving semi-continuous production, and greatly improving production efficiency.

[0036] In one implementation, such as Figure 2 As shown, the dimensions of the tubular shell of the tubular leaching device can be determined according to the gold concentrate processing capacity. For example, the dimensions of the tubular shell of this utility model include: an outer diameter of 50~100cm and a length of 80~200cm along the axial direction of the horizontal cylindrical shell 1.

[0037] In one embodiment, the tubular shell is made of stainless steel with an inner anti-corrosion lining; wherein the anti-corrosion material includes polytetrafluoroethylene and / or enamel material.

[0038] In one embodiment, the stainless steel thickness of the tubular shell is 4~20mm; the thickness of the anti-corrosion material of the tubular shell is 80~150μm.

[0039] In one embodiment, the movable connecting cover opening 12 on the horizontal cylindrical shell 1 is a square opening, and the dimensions of the square opening include: a length of 27~35cm along the axial direction of the horizontal cylindrical shell 1 and a length of 30~60cm perpendicular to the axial direction.

[0040] In one embodiment, the square opening can be located at the center of the horizontal cylindrical shell 1, that is, the square opening is equidistant from the two sides of the horizontal cylindrical shell 1; or it can be located near the discharge sidewall 5.

[0041] In one embodiment, a sealing gasket is provided in the area where the movable connecting cover opening 12 of the horizontal cylindrical housing 1 contacts the movable connecting cover 2, so as to prevent liquid leakage in the detachable tubular leaching device.

[0042] In one embodiment, a cover plate support is provided below the area where the movable connecting cover plate opening 12 contacts the movable connecting cover plate 2, for supporting the movable connecting cover plate 2 and preventing the movable connecting cover plate 2 from entering the internal cavity. The cover plate support may be formed of an inner anti-corrosion lining material.

[0043] In one embodiment, the inlet 6 is located at the lower part of the feed sidewall 4; the outlet 7 is located at the upper part of the discharge sidewall 5; and the cleaning port 8 is located at the lower part of the discharge sidewall 5. In this embodiment, by adjusting the positions of the inlet 6 and outlet 7, the residence time of the leachate or washing solution in the tubular leaching device can be increased, thereby improving the effectiveness of the leaching and washing processes. Furthermore, the cleaning port 8 ensures that as much residual liquid as possible is discharged from the tubular leaching device when removing it.

[0044] In one embodiment, a disassembly handle 3 is provided above the movable connecting cover 2 to facilitate the disassembly or installation of the movable connecting cover 2.

[0045] like Figure 3 As shown, the two flow guide brackets 10 are fixed radially below the movable connecting cover plate 2 along the tubular housing, and the two flow guide brackets 10 are respectively fixed on both sides of the movable connecting cover plate 2 along the axial direction of the tubular housing.

[0046] In one embodiment, the height of the flow guide 10 is related to the size of the tubular shell. This application will not go into too much detail, as long as the bottom surface of the flow guide 10 can be sealed and connected to the inner wall of the tubular shell.

[0047] In one embodiment, the material rod barrel limiting holes 13 on the two flow guide supports 10 are positioned in a one-to-one correspondence, so that the material rod barrels 11 can be fixed in the same position on the two flow guide supports 10, and the multiple material rod barrels 11 can be parallel to each other.

[0048] In one embodiment, the internal chamber of the tubular shell can be divided into a feeding area, an leaching area, and a discharging area by means of insertion or by setting a seal. Specifically, if the insertion method is used, slots can be opened in the inner wall of the tubular shell and the contact area between the support limiting plate 9 and the flow guide support 10, so that the flow guide support 10 is sealed to the inner wall of the tubular shell and the support limiting plate 9. If the seal method is used, sealing gaskets can be set on all the edges of the flow guide support 10 to prevent the feeding area, leaching area and discharging area from communicating through gaps.

[0049] In one embodiment, the surfaces of the flow guide bracket 10 and the bracket limiting plate 9 are covered with an anti-corrosion material; wherein the anti-corrosion material includes polytetrafluoroethylene and / or enamel material.

[0050] 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.

[0051] like Figure 4 As shown, the material rod barrel shell and the material rod top cover are evenly provided with multiple permeation ports for allowing leachate or washing water to enter the interior of the inner filter cloth 14. The ratio of the total surface area of ​​the permeation ports to the surface area of ​​the material rod barrel 11 is (0.6~0.75):1.

[0052] In one embodiment, the material rod top cover and the material rod barrel shell are made of acid-resistant materials, preferably one or more of polytetrafluoroethylene, enamel, and titanium alloy.

[0053] In one embodiment, the inner filter cloth 14 is a conventional choice in the art, as long as it can ensure that the inner filter cloth 14 has good acid resistance. For example, the inner filter cloth 14 used in this utility model includes an acid-resistant filter cloth, preferably a polyester long fiber filter cloth.

[0054] In one embodiment, the material rod barrel 11 has a diameter of 40-80mm, a length of 250-330mm, and a material filling weight of 0.5-1.5kg.

[0055] In one embodiment, the number of material rod barrels 11 that can be set in the tubular leaching device is 1 to 10.

[0056] In one embodiment, the ratio of the length of the material rod barrel 11 to the distance between the two flow guide supports 10 is (1~1.1):1.

[0057] In one embodiment, the method of using the tubular leaching device includes:

[0058] Open the top cover of the material bar barrel 11, fill the material chamber with gold concentrate until the gold concentrate reaches the filling standard, and then close the top cover of the material bar to complete the feeding. The gold concentrate filled in the material chamber is called a material bar. The filling standard is related to the volume of the material chamber, that is, to the size of the material bar barrel 11.

[0059] The filled material rod barrels 11 are fixed on the corresponding material rod barrel limiting holes 13 on the two flow guide brackets 10, until all the material rod barrel limiting holes 13 on the flow guide brackets 10 are fixed with the filled material rod barrels 11.

[0060] The movable connecting cover 2 is installed at the opening 12 of the movable connecting cover of the horizontal cylindrical shell 1, so that the flow guide bracket 10 carrying the material rod barrel 11 extends into the internal cavity along with the installation of the movable connecting cover 2, and the bracket limiting plate 9 is sealed to the flow guide bracket 10, thereby dividing the internal cavity of the tubular shell into a feeding area, a leaching area and a discharging area; at this time, the leaching area and the feeding area are connected only through the material rod barrel 11, and the leaching area and the discharging area are connected only through the material rod barrel 11.

[0061] In one embodiment, the method for removing impurities from lead-gold concentrate using the tubular leaching apparatus includes:

[0062] S1. The lead-gold concentrate is filled into the material rod barrel 11 lined with filter cloth 14 to form a material rod, and the material rod barrel 11 is placed in the tubular leaching device.

[0063] Hydrochloric acid is introduced into an acid-proof reaction vessel and mixed with water to obtain a hydrochloric acid solution with a concentration of 6~12 mol / L. The solution is then heated to obtain a hot hydrochloric acid solution with a temperature of 95℃ or higher.

[0064] The washing water is heated in a hot water reactor to obtain hot washing water at a temperature of over 90°C.

[0065] S2. The hot hydrochloric acid solution is continuously introduced into the tubular leaching device and flows through the material bar to contact the lead-containing gold concentrate for leaching and impurity removal treatment, resulting in a lead-containing acid solution; the lead-containing acid solution is then returned to the acid-resistant reactor to achieve acid circulation in the acid-resistant reactor; until the leaching and impurity removal treatment time reaches T. 浸出 Proceed to step S3; the leaching and impurity removal treatment takes time T. 浸出 The time is 0.5~2h, and the volume hourly space velocity of the hot hydrochloric acid solution is 480~1600h. -1 ;

[0066] S3. The hot washing water is continuously introduced into the tubular leaching device and flows through the material bar for washing treatment to obtain acid-containing washing water; the acid-containing washing water is then returned to the hot water reactor to achieve the circulation of washing water in the hot water reactor; until the washing treatment time reaches T. 洗涤 The washing process is then completed, and the residual water in the tubular leaching device is drained; the washing process lasts for time T. 洗涤 The time is 5~30 minutes, and the volume hourly space velocity of the hot washing water is 480~1600 h⁻¹. -1 ;

[0067] S4. Remove the material barrel 11 from the tubular leaching device and collect the material in the material barrel 11 to obtain lead-free gold concentrate, then return to step S1.

[0068] S5. The lead-free gold concentrate is fed into the silver smelting unit for gold and silver recovery processing to obtain recovered gold and recovered silver.

[0069] The lead-containing acid solution in the acid-resistant reactor is fed into a lead recovery unit for lead recovery treatment to obtain lead chloride.

[0070] The acid-containing washing water in the hot water reactor is neutralized in the neutralization reaction unit and then discharged after meeting the standards.

[0071] In this embodiment, during the leaching process, hot hydrochloric acid solution enters the feeding zone through inlet 6 until the liquid level in the feeding zone exceeds the lowest material rod barrel 11. The hot hydrochloric acid solution permeates through the filter cloth 14 lining the lowest material rod barrel 11 into its interior and contacts the material rods, dissolving impurities such as lead and iron in the material rods to obtain lead-containing acid solution. This lead-containing acid solution enters the leaching zone. Because the feeding rate of the hot hydrochloric acid solution is greater than the permeation rate, the liquid level in the feeding zone gradually rises until all material rod barrels 11 are permeated with liquid. At this point, the liquid level in the leaching zone also gradually rises. When the liquid level in the leaching zone exceeds the lowest material rod barrel 11, the lead-containing acid solution in the leaching zone, through permeation, not only permeates into all material rod barrels 11 to complete the leaching process, but also partially enters the discharge zone until the liquid level in the discharge zone rises to outlet 7, thus circulating the acid solution and achieving the purpose of acid solution circulation. During the washing process, the circulation method of the washing water is the same as that of the hot hydrochloric acid solution, which will not be elaborated here. When the washing process is completed, the residual liquid (part of the washing water after the washing process) in the tubular leaching device can be discharged through the cleaning port 8.

[0072] The present invention will be further illustrated by the following embodiments, but the present invention is not limited thereto. The lead-containing gold concentrate used in the present invention is a mixed gold concentrate formed from gold concentrate obtained by the Nelson gravity separation process and middlings, the properties of which are shown in Table 1.

[0073] Table 1 Parameters of lead-gold concentrate

[0074]

[0075] Example 1

[0076] Tubular leaching equipment for lead-gold concentrate, such as Figure 1 As shown; there are 6 material rod barrels 11, each with a diameter of 60mm, a length of 300mm, and a material filling weight of 1kg.

[0077] Tube leaching methods for removing impurities from lead-gold concentrates include:

[0078] S1. The lead-gold concentrate is filled into the material rod barrel 11 lined with filter cloth 14 to form a material rod, and the material rod barrel 11 is placed in the tubular leaching device.

[0079] Hydrochloric acid is introduced into an acid-proof reaction vessel and mixed with water. After the concentration of the hydrochloric acid solution reaches 8 mol / L, it is heated to obtain a hot hydrochloric acid solution at a temperature of 98℃.

[0080] The washing water is heated in a hot water reactor to obtain hot washing water at a temperature of 95°C.

[0081] S2. The hot hydrochloric acid solution is continuously introduced into the tubular leaching device and flows through the material bar to contact the lead-containing gold concentrate for leaching and impurity removal treatment, resulting in a lead-containing acid solution; the lead-containing acid solution is then returned to the acid-resistant reactor to achieve acid circulation in the acid-resistant reactor; until the leaching and impurity removal treatment time reaches T. 浸出 Proceed to step S3; the leaching and impurity removal treatment takes time T. 浸出 The time interval is 1 hour, and the volume hourly space velocity (VHSV) of the hot hydrochloric acid solution is 800 h⁻¹. -1 ;

[0082] S3. The hot washing water is continuously introduced into the tubular leaching device and flows through the material bar for washing treatment to obtain acid-containing washing water; the acid-containing washing water is then returned to the hot water reactor to achieve the circulation of washing water in the hot water reactor; until the washing treatment time reaches T. 洗涤 The washing process is then completed, and the residual water in the tubular leaching device is drained; the washing process lasts for time T. 洗涤 The time is 20 minutes, and the volume hourly space velocity of the hot washing water is 800 h⁻¹. -1 ;

[0083] S4. Remove the material barrel 11 from the tubular leaching device and collect the material in the material barrel 11 to obtain lead-free gold concentrate, then return to step S1.

[0084] S5. The lead-free gold concentrate is fed into the silver smelting unit for gold and silver recovery processing to obtain recovered gold and recovered silver.

[0085] The lead-containing acid solution, after circulating three batches in the acid-resistant reactor, is cooled and crystallized before being filtered to obtain lead chloride and filtrate. The cooling and crystallization conditions include cooling to room temperature (20°C) and obtaining lead chloride with a purity of over 90%.

[0086] The filtrate from lead recovery treatment, the washing water from the hot water reactor, and the residual water from the tubular leaching device are introduced into a neutralization reaction device to contact with alkali for neutralization reaction, resulting in neutralized wastewater with a pH value of 6-8. The neutralized wastewater is then filtered, and the resulting filter residue is stockpiled. The resulting filtrate is the wastewater that meets the discharge standards.

[0087] The effect of using the tubular leaching device of this invention to process lead-gold concentrate is shown in Table 2.

[0088] Comparative Example 1

[0089] The method for removing impurities from lead-gold concentrate includes: introducing the lead-gold concentrate into a corrosion-resistant reaction vessel and contacting it with a hydrochloric acid solution of 8 mol / L, then heating it to a temperature of 98°C and reacting it at that temperature for 1 hour to obtain a leaching product; filtering the leaching product through a filtration device to obtain lead-removed gold concentrate and a first filtrate;

[0090] The lead-free gold concentrate is introduced into a hot water reactor and brought into contact with washing water. The mixture is then heated to 95°C and washed at this temperature for 20 minutes to obtain a washing product. The washing product is then filtered through a filtration device to obtain washed gold concentrate and a second filtrate.

[0091] The washed gold concentrate is then fed into a silver smelting unit for gold and silver recovery processing to obtain recovered gold and recovered silver.

[0092] The first filtrate is cooled and crystallized before being filtered by a filtration device to obtain lead chloride and a third filtrate.

[0093] The third and second filtrates are introduced into a neutralization reaction device to contact with alkali for neutralization reaction, resulting in neutralized wastewater with a pH of 6-8. The neutralized wastewater is then filtered, and the resulting filter residue is stored. The resulting filtrate is wastewater that meets discharge standards.

[0094] The effects of using existing methods to process lead-containing gold concentrate are shown in Table 2.

[0095] Table 2. Effects of the Examples and Comparative Examples

[0096]

[0097] in,

[0098] Lead removal rate = (1 - weight of lead in leaching residue / weight of lead in raw material) × 100%;

[0099] Iron removal rate = (1 - weight of iron in leaching residue / weight of iron in raw material) × 100%;

[0100] Total gold and silver recovery rate = (total weight of gold and silver in leaching residue / total weight of gold and silver in raw materials) × 100%;

[0101] Lead recovery rate = (1 - weight of recovered lead chloride / weight of lead in raw material) × 100%.

[0102] Therefore, a comparison of the data between Example 1 and Comparative Example 1 shows that using the tubular leaching device of this invention to process lead-gold concentrate can improve the total gold and silver recovery rate and the lead recovery rate while ensuring the lead removal rate, iron removal rate, and purity of the obtained lead salt. Furthermore, using the tubular leaching device of this invention eliminates the need for pre-leaching heating and post-leaching filtration, reducing production steps, saving production time, achieving semi-continuous production, and greatly improving production efficiency. On the other hand, the tubular leaching device of this invention facilitates feeding and unloading, reducing the difficulty of processing lead-gold concentrate.

[0103] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0104] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0105] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A tubular leaching apparatus for processing lead-gold concentrate, characterized in that, The tubular leaching device includes a tubular shell, a support limiting plate, two flow guide supports, and a material rod tank; The tubular shell includes an integrally formed horizontal cylindrical shell, an inlet sidewall, and an outlet sidewall, which together form an internal chamber for liquid flow. The inlet sidewall has an inlet for injecting the leaching solution. The outlet sidewall has an outlet and a cleaning port. The outlet is used to discharge the leaching solution after leaching, and the cleaning port is used to discharge cleaning wastewater. The horizontal cylindrical shell has an opening for a movable connecting cover plate for detachable connection. Two flow guide brackets are fixed radially below the movable connecting cover plate along the tubular shell, so that the flow guide brackets can extend into the internal cavity as the movable connecting cover plate is installed; material rod barrel limiting holes are provided at the relative positions of the two flow guide brackets for fixing the material rod barrel; The bracket limiting plate is disposed on the inner wall of the internal chamber; the bracket limiting plate is detachably and sealed to the flow guide bracket to divide the internal chamber into a feeding zone, a leaching zone and a discharging zone; the leaching zone is connected to the feeding zone through a material bar barrel; the leaching zone is connected to the discharging zone through a material bar barrel. The material rod barrel includes a detachable material rod top cover, a material rod barrel shell, and an inner filter cloth lining. The inner filter cloth is disposed on the inner wall of the material rod top cover and the material rod barrel shell, forming a material chamber for filling the gold concentrate.

2. The tubular leaching apparatus according to claim 1, characterized in that, The tubular shell is made of stainless steel with an inner anti-corrosion lining. The surfaces of the bracket limiting plate and the flow guide bracket are covered with anti-corrosion material; The corrosion-resistant materials include polytetrafluoroethylene and / or enamel materials.

3. The tubular leaching apparatus according to claim 2, characterized in that, The thickness of the stainless steel in the tubular shell is 4~20mm; The thickness of the anti-corrosion material of the tubular shell is 80~150μm.

4. The tubular leaching apparatus according to claim 1, characterized in that, The area where the opening of the movable connecting cover of the horizontal cylindrical shell contacts the movable connecting cover is provided with a sealing gasket to prevent liquid leakage from the tubular leaching device.

5. The tubular leaching apparatus according to claim 1, characterized in that, The area where the bracket limiting plate contacts the flow guide bracket is provided with a slot so that the flow guide bracket and the bracket limiting plate can be inserted into each other.

6. The tubular leaching apparatus according to claim 1, characterized in that, The liquid inlet is located at the lower part of the feed sidewall; the liquid outlet is located at the upper part of the discharge sidewall; and the cleaning port is located at the lower part of the discharge sidewall.

7. The tubular leaching apparatus according to claim 1, characterized in that, The tubular leaching device contains 1 to 10 material rod barrels.

8. The tubular leaching apparatus according to claim 1, characterized in that, The material of the top cover of the material bar and the shell of the material bar are respectively one or more of polytetrafluoroethylene, enamel and titanium alloy; The inner lining filter cloth includes acid-resistant filter cloth.

9. The tubular leaching apparatus according to claim 1, characterized in that, The diameter of the material rod barrel is 40~80mm and the length is 250~330mm; The ratio of the length of the material bar to the distance between the two flow guide supports is (1~1.1):

1.

10. The tubular leaching apparatus according to claim 1, characterized in that, The material bar barrel shell and the material bar top cover are provided with multiple permeation ports; The ratio of the total surface area of ​​the permeation port to the surface area of ​​the material rod barrel is (0.6~0.75):1.

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