Adsorption device for heap leaching pregnant solution with low gold content and heavy mud content

Abstract

The utility model relates to a low-gold heap leaching pregnant solution adsorption device with heavy mud content, which comprises multiple stages of adsorption towers which are connected with one another, the bottoms of the adsorption towers are connected with water inlet pipes, the tops of the adsorption towers are connected with water outlet pipes, the water outlet pipe of the previous stage of adsorption tower is connected with the water inlet pipe of the next stage of adsorption tower, and the multiple stages of adsorption towers are connected together through the circulation. A carbon discharge port is also formed in the bottom of the adsorption tower; the water inlet pipe is connected with a water inlet branch pipe extending into the adsorption tower, a plurality of flow guide pipes are arranged on the water inlet branch pipe, every two flow guide pipes form a group, the flow guide pipes are connected with elbows, and openings of the two elbows of each group of flow guide pipes are oppositely arranged at a certain angle, so that the water outlet direction of each group of flow guide pipes is in an impeller shape. By modifying the water inlet structure of the adsorption device and the structure in the adsorption tower, the mud-containing pregnant solution and the activated carbon fully flow in the tower, and the adsorption capacity of the activated carbon is improved, so that the adsorption index and the comprehensive treatment capacity are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to an adsorption device for heap leaching precious liquid with low gold content and heavy mud. Background Art

[0002] Heap leaching process (such as Figure 1 (as shown) is a method of spraying a leaching liquid on a ore pile so that the useful components in the ore are selectively leached out during the downward infiltration process, and the useful components are recovered from the precious liquid flowing out from the bottom of the pile. Heap leaching is often used in the mining of copper, uranium, gold and silver mines, as well as the treatment of tailings from concentrators and smelter slag containing useful components due to its advantages such as simple process, low equipment investment and low operating cost. However, its disadvantages of low leaching rate and adsorption rate also limit the application scenarios of this process. Especially for low-gold and heavy mud ore piles, the ore components include quartz sandstone fragments, debris, clay, etc. Quartz sandstone has a fine-grained structure and an impregnation-like structure, accounting for about 75%, clay has a muddy structure and an impregnation-like structure, accounting for about 20%, and other minerals account for about 5%. The heap leaching recovery effect of this type of ore is even worse, which is mainly manifested in the process of precious liquid adsorption recovery. The activated carbon in the adsorption tower is seriously calcified and compacted, the adsorption rate is low, and the turbid precious liquid is easy to clog the water filter circle in the adsorption tower, resulting in poor production stability, low processing capacity and high processing cost.

[0003] After long-term research, technicians proposed to optimize the entire adsorption process from three aspects: heap leaching ore property analysis, adsorption equipment modification, and adsorption process parameter adjustment to solve the existing problems. Among them, in the adsorption equipment modification, it is necessary to consider how to make the activated carbon active in the tower, improve the calcification and hardening of activated carbon, improve the adsorption efficiency of activated carbon, and how to solve the turbid precious liquid blocking the water filter circle and improve the water flow capacity of the water filter circle to ensure the balance of water inlet and outlet of the adsorption tower. Utility Model Content

[0004] The utility model provides a device for adsorbing low-gold and heavy-mud heap leaching precious liquid.

[0005] The specific technical scheme of the utility model is: a low-gold and heavy mud heap leaching precious liquid adsorption device, comprising a plurality of mutually connected adsorption towers, the bottom of the adsorption tower is connected with a water inlet pipe, the top is connected with a water outlet pipe, the outlet pipe of the upper adsorption tower is connected with the water inlet pipe of the lower adsorption tower, and the multi-stage adsorption towers are connected together in a cycle in this way, and a carbon discharge port is also arranged at the bottom of the adsorption tower; the water inlet pipe is connected with a water inlet branch pipe extending into the adsorption tower, and a plurality of guide pipes are arranged on the water inlet branch pipe, and the guide pipes are grouped in pairs, and the guide pipes are connected with bent pipes, and the two bent pipe openings of each group of guide pipes are arranged in opposite directions at a certain angle, so that the water outlet direction of each group of guide pipes is in an impeller shape.

[0006] Furthermore, preferably, a water filter ring is installed on the top of the adsorption tower, and the water filter ring is cylindrical, and a plurality of water filter holes are opened on the bottom surface and side walls of the cylinder.

[0007] Furthermore, preferably, the diameter of the water inlet pipe is 100 mm.

[0008] Furthermore, preferably, the diameters of the guide pipe and the curved pipe are 40 mm.

[0009] Furthermore, preferably, valves are installed at the water inlet pipe, the water outlet pipe and the charcoal discharge port.

[0010] The beneficial effect of the utility model is that the utility model makes the muddy precious liquid and activated carbon flow fully in the tower by modifying the water inlet structure and the structure inside the adsorption tower of the adsorption device, thereby improving the adsorption capacity of the activated carbon, thereby improving the adsorption index and comprehensive treatment capacity. The practical examples have proved that the device has a good adsorption effect on the heap leaching precious liquid with low gold content and heavy mud, and the adsorption rate and gold-carrying carbon grade have been greatly improved. The gold grade of the tail liquid and the mid-to-late stage heap washing cycle have been significantly reduced, and the overall treatment capacity has been significantly improved compared with the original device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The following is a flow chart of the existing heap leaching process;

[0012] Figure 2 It is a front view of an existing heap leaching precious liquid adsorption device;

[0013] Figure 3 for Figure 2 Schematic diagram of the structure of the medium adsorption tower-water filter circle;

[0014] Figure 4 This is a front view of a low-gold and heavy-mud heap leaching precious liquid adsorption device of the utility model;

[0015] Figure 5 for Figure 4 Structural diagram of the middle adsorption tower-water inlet branch pipe;

[0016] Figure 6 for Figure 4 Schematic diagram of the structure of the medium adsorption tower-water filter circle;

[0017] In the figure: 1-adsorption tower, 2-water inlet pipe, 3-water outlet pipe, 4-water inlet branch pipe, 401-flow guide pipe, 402-elbow pipe, 5-water filter ring, 501-water filter hole, 6-charcoal discharge port. DETAILED DESCRIPTION

[0018] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figures 4 to 6 As shown, a low-gold and heavy-mud heap leaching precious liquid adsorption device comprises a plurality of mutually connected adsorption towers 1, the bottom of the adsorption tower 1 is connected with a water inlet pipe 2, the diameter of the water inlet pipe 2 is 100 mm, the top of the adsorption tower 1 is connected with a water outlet pipe 3, the water outlet pipe 3 of the upper-stage adsorption tower is connected with the water inlet pipe 2 of the lower-stage adsorption tower, and the plurality of adsorption towers are connected together in such a cycle, a carbon discharge port 6 is further provided at the bottom of the adsorption tower 1, and valves are installed at the water inlet pipe 2, the water outlet pipe 3 and the carbon discharge port 6 for easy control.

[0022] The water inlet pipe 2 is connected to a water inlet branch pipe 4 extending into the adsorption tower 1. A plurality of flow guide pipes 401 are arranged on the water inlet branch pipe 4. The flow guide pipes 401 are arranged in groups of two. Each flow guide pipe 401 is connected to a bend pipe 402. The openings of the two bend pipes 402 of each group of flow guide pipes are arranged in opposite directions at a certain angle, so that the water outlet direction of each group of flow guide pipes is in an impeller shape. The diameter of the flow guide pipe 401 and the bend pipe 402 is 40 mm.

[0023] A water filter ring 5 is installed on the top of the adsorption tower 1. The water filter ring 5 is cylindrical, and a plurality of water filter holes 501 are opened on the bottom surface and side wall of the cylinder.

[0024] Depend on Figures 2 to 3 and Figures 4 to 6By comparison, it can be seen that the low-gold and heavy-mud heap leaching precious liquid adsorption device proposed in this application has been modified as follows based on the existing heap leaching precious liquid adsorption device:

[0025] 1. In order to prolong the contact time between the precious liquid and the activated carbon, the water inlet method is changed from the top of the adsorption tower to the bottom.

[0026] 2. In order to make the activated carbon move in the tower, the diameter of the water inlet pipe 2 is changed from the original 150mm to 100mm to increase the water inlet pressure. At the same time, a water inlet branch pipe 4 is added at the inlet of the water inlet pipe 2, and a plurality of guide pipes 401 are arranged on the water inlet branch pipe 4, and a bend pipe 402 is connected to the open end of the guide pipe 401, so that the water outlet direction of the guide pipes in groups of two forms an impeller shape, which has a stirring effect on the activated carbon and makes the activated carbon flow in the tower, thereby improving the calcification and hardening of the activated carbon, improving the energy efficiency of participating in gold adsorption, and improving the grade of gold-loaded carbon.

[0027] 3. In order to solve the problem of turbid precious liquid clogging the water filter ring, the water filter ring with only bottom water filtering function is transformed into a water filter ring with cylindrical bottom and side water passing capacity, thereby improving the water passing capacity of the water filter ring, balancing the water inlet and outlet of the adsorption tower, and ensuring the stable operation of the adsorption device.

[0028] A low-gold heap leaching mine: using heap leaching + activated carbon adsorption process, the average heap leaching gold grade is about 0.3g / t, and the precious liquid gold grade is 0.75mg / ml. The heap leaching precious liquid adsorption device with low gold and heavy mud content described in this application is used to perform gold adsorption on the heap leaching precious liquid. The specific implementation plan is as follows:

[0029] The precious liquid is introduced into the primary adsorption tower 1 from the water inlet pipe 2, and the flow rate of the precious liquid is controlled at 30m 3 / h-35m 3 / h, the precious liquid will flow out from the bend 402 of the water inlet branch pipe 4, and an impeller-shaped water flow will be formed between a group of bends 402 facing each other, stirring the activated carbon at the bottom of the absorption tower 1, so that the activated carbon will be active in the tower and participate in the adsorption of gold, thereby improving the adsorption capacity of the activated carbon; after the adsorption of the first-stage adsorption tower is completed, the precious liquid will pass through the filter water circle 5 and flow into the next-stage adsorption tower through the outlet pipe 3 for secondary adsorption, and the cycle will continue until the lean liquid after the adsorption of the last-stage adsorption tower is completed is returned from the outlet pipe to the spray system for use as spray liquid, and the gold-loaded carbon in each stage of the adsorption tower is discharged from the carbon discharge port 6 and transferred to the desorption process system for desorption.

[0030] After the above adsorption operation, the adsorption index results are as follows: the gold-loaded carbon grade increased to 5.65g / kg, an increase of 121% compared to the original 2.55g / kg; the average adsorption rate increased to 85%, an increase of 30.8% compared to the original 65%; the adsorption capacity of the precious liquid increased from 20m 3 / d increased to 35m 3 / d, the adsorption capacity is increased to 1.75 times of the original; the gold grade of the tail liquid is reduced to 0.1mg / ml, compared with the original 0.15mg / ml, a decrease of 33%; the mid-to-late stage washing cycle is shortened from the original 40 days to 20 days.

[0031] A low-gold heap leaching (low-grade + cyanide tailings) mine II: Heap leaching + activated carbon adsorption process is used to treat low-grade waste ore, with an average ore grade of 0.25-0.3g / t and a precious liquid gold grade of 0.50mg / ml. The heap leaching precious liquid adsorption device with low gold and heavy mud content described in this application is used to perform gold adsorption on the heap leaching precious liquid. The specific implementation plan is as follows:

[0032] The precious liquid is introduced into the primary adsorption tower 1 from the water inlet pipe 2, and the flow rate of the precious liquid is controlled at 30m 3 / h-35m 3 / h, the precious liquid will flow out from the bend 402 of the water inlet branch pipe 4, and an impeller-shaped water flow will be formed between a group of bends 402 facing each other, stirring the activated carbon at the bottom of the absorption tower 1, so that the activated carbon will be active in the tower and participate in the adsorption of gold, thereby improving the adsorption capacity of the activated carbon; after the adsorption of the first-stage adsorption tower is completed, the precious liquid will pass through the filter water circle 5 and flow into the next-stage adsorption tower through the outlet pipe 3 for secondary adsorption, and the cycle will continue until the lean liquid after the adsorption of the last-stage adsorption tower is completed is returned from the outlet pipe to the spray system for use as spray liquid, and the gold-loaded carbon in each stage of the adsorption tower is discharged from the carbon discharge port 6 and transferred to the desorption process system for desorption.

[0033] After the above adsorption operation, the adsorption index results are as follows: the gold-loaded carbon grade increased to 3g / kg, an increase of 67% compared to the original 1.8g / kg; the average adsorption rate increased to 87%, an increase of 28% compared to the original 68%; the adsorption capacity of the precious liquid increased from 18m 3 / d increased to 38m 3 / d, the adsorption capacity is increased to 2.1 times of the original; the gold grade of the tail liquid is reduced to below 0.07mg / ml, compared with the original 0.16mg / ml, a decrease of 56%; the mid-to-late stage washing cycle is shortened from the original 50 days to 25 days.

[0034] It can be seen from the adsorption indicators of the above application examples that the use of the adsorption device described in the present application to treat heap leaching precious liquid with low gold content and heavy mud can well improve the adsorption indicators, and the adsorption rate and the grade of gold-loaded carbon are greatly improved. The processing capacity of the adsorption device is increased to 1.75-2.1 times of the original, and the gold grade of the tail liquid and the mid-to-late heap washing cycle are also significantly improved.

[0035] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for adsorbing low-gold and heavy-mud heap leaching precious liquid, comprising a plurality of mutually connected adsorption towers (1), characterized in that: The bottom of the adsorption tower (1) is connected to a water inlet pipe (2), and the top is connected to a water outlet pipe (3). The water outlet pipe (3) of the upper adsorption tower is connected to the water inlet pipe (2) of the lower adsorption tower, and the multiple adsorption towers are connected in a cycle in this way. The bottom of the adsorption tower (1) is also provided with a carbon discharge port (6); the water inlet pipe (2) is connected to a water inlet branch pipe (4) extending into the adsorption tower (1), and the water inlet branch pipe (4) is provided with a plurality of guide pipes (401). The guide pipes (401) are arranged in groups of two, and the guide pipes (401) are connected to curved pipes (402). The openings of the two curved pipes (402) of each group of guide pipes are arranged in opposite directions at a certain angle, so that the water outlet direction of each group of guide pipes is in an impeller shape.

2. The device for adsorbing low-gold and heavy-mud heap leaching precious liquid according to claim 1, characterized in that: A water filter ring (5) is installed on the top of the adsorption tower (1); the water filter ring (5) is cylindrical, and a plurality of water filter holes (501) are provided on the bottom surface and side walls of the cylinder.

3. The device for adsorbing low-gold and heavy-mud heap leaching precious liquid according to claim 1, characterized in that: The diameter of the water inlet pipe (2) is 100 mm.

4. The device for adsorbing low-gold and heavy-mud heap leaching precious liquid according to claim 1, characterized in that: The diameters of the flow guide pipe (401) and the curved pipe (402) are 40 mm.

5. The device for adsorbing low-gold and heavy-mud heap leaching precious liquid according to claim 1, characterized in that: Valves are installed at the water inlet pipe (2), the water outlet pipe (3) and the coal discharge port (6).

Images