Double-impeller leaching stirring tank for gold selection, which is convenient for cleaning

Abstract

The present invention relates to the field of leaching agitators, especially a double-impeller leaching agitator for gold separation that is easy to clean. In view of the problems of poor stirring effect and low efficiency of the existing leaching agitators, the following solution is proposed. It includes a cylinder body with a plurality of support frames installed at the bottom end. The cross-section of the cylinder body is oval. A driving motor is installed at the middle position of the bottom end of the cylinder body. The output shaft of the driving motor is connected to a rotating cylinder located inside the cylinder body. Two telescopic impeller assemblies that are rotatably connected inside the cylinder body are movably installed on the outer side wall of the rotating cylinder. The structure of the present invention is unique, which can make the pulp in the cylinder form a more complex flow pattern during the stirring process, there is no dead angle in the liquid flow, and the mixing and leaching efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of leaching agitators, and particularly to a double-impeller leaching agitator for gold separation that is convenient for cleaning. Background Art

[0002] At present, hydrometallurgy is an important branch of chemical beneficiation. It has good separation effect and wide application. The leaching tanks widely used in the extraction metallurgy of non-ferrous metals mainly include percolation tanks, compressed air agitation tanks, mechanical agitation tanks, air and mechanical combined agitation tanks, and Karr-Metas.

[0003] Chinese Patent No. CN216514034U discloses a double-impeller leaching agitator. By setting an electric push rod, an impeller body, a housing, a sound-absorbing plate, and a buffer protection plate, it is convenient to drive the impeller body to lift by controlling the electric push rod, so as to facilitate the agitation work in areas of different heights. The agitation effect is good. Then, through the sound-absorbing plate, buffer springs, and buffer protection plate in the housing, the noise diffused to the outside can be effectively reduced, the noise pollution is reduced, and the use performance of the equipment is improved. Although it can drive the impeller body to lift by the electric push rod, it can only agitate the area of a certain height within a certain period of time and cannot always keep the inside of the agitation tank in a fully agitated state, and there is still a problem of poor agitation efficiency. Summary of the Invention

[0004] The double-impeller leaching agitator for gold separation proposed by the present invention solves the problems of poor agitation effect and low efficiency of the existing leaching agitators.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The double-impeller leaching agitator for gold separation includes a cylinder body with a plurality of support frames installed at the bottom end. The cross-section of the cylinder body is oval. A driving motor is installed at the middle position of the bottom end of the cylinder body. The output shaft of the driving motor is connected to a rotating cylinder located inside the cylinder body. Two telescopic impeller assemblies rotatably connected inside the cylinder body are movably installed on the outer side wall of the rotating cylinder. The telescopic impeller assembly includes two stirring blades connected by a spring rod;

[0007] A gas guiding assembly connected to an air pump is installed at the top end of the rotating cylinder. The air outlet end of the gas guiding assembly is communicated with the telescopic impeller assembly with a jet cavity through a gas guiding pipe;

[0008] The rotating cylinder is provided with a plurality of liquid guiding holes along its radial direction. The bottom end of the rotating cylinder is communicated with the top opening of the cylinder body through a liquid return mechanism.

[0009] As a preferred embodiment, the telescopic impeller assembly further includes two wavy stirring blades. Spring rods are connected between the top and bottom ends of the two stirring blades. When the spring rods are telescoped to the minimum length, the two stirring blades are arranged side by side. A fixed rod with a clamping block is installed on one side of a stirring blade, and the clamping block is clamped in a clamping groove on the outer wall of the rotating cylinder.

[0010] As a preferred embodiment, air guide holes are formed in the stirring blades. The air guide holes are connected to an air guide assembly through air guide pipes. Jet cavities with jet holes at both ends are provided at the bent portions of the stirring blades. The jet cavities are communicated with the air guide holes. A tension spring is installed inside the jet cavity through a spring fixing member. Both ends of the tension spring are respectively connected to conical sealing plugs located at the jet holes.

[0011] As a preferred embodiment, a protruding mounting shaft is installed between the top and bottom ends of the other stirring blade. A rotating wheel that is in rolling connection with the inner wall of the cylinder body is sleeved on the mounting shaft.

[0012] As a preferred embodiment, the air guide assembly includes an air guide cylinder located at the top of the rotating cylinder. A rotating joint is installed at the top of the air guide cylinder. The other end of the rotating joint is connected to an air pump through an air guide pipe;

[0013] An installation ring is rotatably sleeved outside the air guide cylinder. Connecting rods are installed on both sides of the installation ring. Two telescopic rods II are installed on the outer wall of the cylinder body. The output shaft of the telescopic rod II is fixedly connected to the connecting rod.

[0014] As a preferred embodiment, a plurality of limit pins are installed at the bottom end of the air guide cylinder. The limit pins are movably inserted into pin holes at the top end of the rotating cylinder.

[0015] As a preferred embodiment, the liquid return mechanism includes a liquid guide cylinder with its top end communicated with the bottom end of the rotating cylinder. The driving motor is installed at the bottom end of the rotating cylinder. The output shaft of the driving motor is connected to a rotating shaft located inside the rotating cylinder. A spiral blade that is in sliding connection with the inner wall of the rotating cylinder is installed outside the rotating shaft. A liquid return pipe and a liquid discharge pipe with valves are connected to the bottom end of the rotating cylinder;

[0016] The top end of the rotating shaft is fixedly connected to a connecting member that is horizontally arranged at the bottom end inside the rotating cylinder.

[0017] As a preferred embodiment, a loading mesh cylinder with an open top end is provided inside the rotating cylinder. The top end of the loading mesh cylinder is threadedly connected to a threaded groove at the bottom end of the air guide cylinder. Activated carbon is filled inside the loading mesh cylinder.

[0018] As a preferred embodiment, an arc-shaped filter screen that separates one side inside the cylinder body is movably installed inside the cylinder body. The arc-shaped filter screen is located between the liquid outlet of the liquid return pipe and the rotating cylinder. A telescopic rod I that drives the arc-shaped filter screen to move up and down is installed outside the cylinder body.

[0019] As a preferred embodiment, two telescopic impeller assemblies are arranged on the rotating cylinder at a 90-degree angle.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention provides a double-impeller leaching stirring tank for gold separation that is easy to clean. By setting the cylinder body as an ellipse and cooperating with stirring blades covering the entire liquid height in a wavy shape, a more complex flow pattern of the pulp in the cylinder can be formed during stirring, reducing the dead corners of liquid flow, making the stirring more uniform and thorough at the same time, and having a high mixing efficiency;

[0022] At the same time, the setting of the telescopic impeller blades can perfectly adapt to the elliptical cylinder design. When rotating, the radial position of the stirring blades also changes, further improving the stirring effect.

[0023] 2. The present invention provides a double-impeller leaching stirring tank for gold separation that is easy to clean. Through the setting of the rotating cylinder, the liquid guiding holes and the liquid return mechanism, the pulp converges and impacts each other in the rotating cylinder under the action of gravity during flow and circulates, further improving the mixing effect and reducing the mixing dead corners;

[0024] At the same time, by arranging a loading mesh cylinder capable of filling activated carbon inside the rotating cylinder, the absorption of impurities in the mixed liquid or the leaching by the activated carbon method can be realized.

[0025] 3. The present invention provides a double-impeller leaching stirring tank for gold separation that is easy to clean. Through the setting of the air guiding assembly and the stirring blades with air jet cavities, gas can be evenly dispersed in the pulp, and bubbles are ejected and move at multiple positions in the cylinder body, which not only strengthens the pulp movement but also increases the gaseous oxygen necessary for leaching, improves the leaching rate, reduces the leaching time, and improves the recovery rate.

[0026] 4. The present invention provides a double-impeller leaching stirring tank for gold separation that is easy to clean. Through the setting of the arc-shaped filter screen and the first telescopic rod, after the leaching and stirring are completed, the gold-bearing resin particles adsorbed by the ion exchange resin method can be quickly filtered out or the impurities in the pulp can be filtered.

[0027] The structure of the present invention is unique, there is no dead corner in liquid flow, and the mixing and leaching efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the double-impeller leaching stirring tank for gold separation proposed by the present invention;

[0029] Figure 2 It is a partial cross-sectional view of the double-impeller leaching stirring tank for gold separation proposed by the present invention;

[0030] Figure 3 Schematic diagram of the installation of the telescopic impeller assembly and the rotating cylinder of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0031] Figure 4 Schematic diagram of the structure of the telescopic impeller assembly of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0032] Figure 5 Schematic diagram of the structure of the stirring blade of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0033] Figure 6 is Figure 5 Partial enlarged view at A in

[0034] Figure 7 Schematic diagram of the structure of the rotating cylinder of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0035] Figure 8 Schematic diagram of the structure of the air guide assembly and the loading mesh cylinder of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0036] Figure 9 Schematic diagram of the structure of the liquid return mechanism and the driving motor of the double-impeller leaching stirring tank for gold separation, which is convenient for cleaning, proposed by the present invention;

[0037] Figure 10 Schematic diagram of the structure of Embodiment 3;

[0038] Figure 11 Schematic diagram of the structure of the arc-shaped filter screen and the first telescopic rod in Embodiment 3.

[0039] In the figure: 1, support frame; 2, cylinder body; 3, telescopic impeller assembly; 301, clamping block; 302, fixed rod; 303, spring rod; 304, stirring blade; 3041, jet cavity; 3042, spring fixing part; 3043, tension spring; 3044, conical sealing plug; 305, mounting shaft; 306, rotating wheel; 4, rotating cylinder; 401, pin hole; 402, liquid guiding hole; 403, clamping groove; 5, air guide assembly; 501, rotating joint; 502, mounting ring; 503, connecting rod; 504, second telescopic rod; 505, air guide cylinder; 506, limit pin; 6, arc-shaped filter screen; 7, first telescopic rod; 8, liquid return pipe; 9, liquid guiding cylinder; 10, driving motor; 11, drain pipe; 12, connecting piece; 13, rotating shaft; 14, spiral blade; 15, loading mesh cylinder. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0041] Example 1. Refer to Figures 1-9 , a double-impeller leaching stirring tank for gold selection that is convenient for cleaning, including a cylinder body 2 with a plurality of support frames 1 installed at the bottom end. The cross-section of the cylinder body 2 is oval. A driving motor 10 is installed at the middle position of the bottom end of the cylinder body 2. The output shaft of the driving motor 10 is connected to a rotating cylinder 4 located inside the cylinder body 2. Two telescopic impeller assemblies 3 that are rotatably connected inside the cylinder body 2 are movably installed on the outer side wall of the rotating cylinder 4. The telescopic impeller assembly 3 includes two stirring blades 304 connected by a spring rod 303;

[0042] The telescopic impeller assembly 3 also includes two wavy stirring blades 304. Spring rods 303 are connected between the top and bottom ends of the two stirring blades 304. And the two stirring blades 304 are arranged side by side when the spring rod 303 is stretched to the minimum length. A fixing rod 302 with a clamping block 301 is installed on one side of a stirring blade 304. The clamping block 301 is clamped in the clamping groove 403 on the outer side wall of the rotating cylinder 4. The clamping installation method can realize the quick disassembly and assembly of the telescopic impeller assembly 3, and it is convenient to clean the inside of the cylinder body 2 and the telescopic impeller assembly 3 after disassembly and assembly.

[0043] Further, the stirring blade 304 can also be in a spiral tubular shape. When the spring rod 303 drives it to stretch to the shortest distance, the two stirring blades 304 are arranged in a staggered manner up and down;

[0044] Air guide holes are opened on the stirring blade 304. The air guide holes are connected to an air guide assembly 5 through an air guide pipe. Jet cavities 3041 with jet holes opened at both ends are provided at the bent parts of the stirring blade 304. The jet cavities 3041 are communicated with the air guide holes. A tension spring 3043 is installed inside the jet cavity 3041 through a spring fixing member 3042. The two ends of the tension spring 3043 are respectively connected to a conical sealing plug 3044 located at the jet hole;

[0045] An outwardly protruding mounting shaft 305 is installed between the top and bottom ends of the other stirring blade 304. A rotating wheel 306 that is in rolling connection with the inner wall of the cylinder body 2 is sleeved on the mounting shaft 305.

[0046] Further, the two telescopic impeller assemblies 3 are arranged at a 90-degree angle on the rotating cylinder 4. The two telescopic impeller assemblies 3 are always in pulp with different flow rates, further improving the mixing effect.

[0047] At the top end of the rotating cylinder 4, a gas guiding assembly 5 connected to an air pump is installed. The air outlet end of the gas guiding assembly 5 is connected to the telescopic impeller assembly 3 with a jet cavity 3041 through a gas guiding pipe (not shown in the figure).

[0048] The gas guiding assembly 5 includes a gas guiding cylinder 505 located at the top end of the rotating cylinder 4. At the top end of the gas guiding cylinder 505, a rotating joint 501 is installed. The other end of the rotating joint 501 is connected to an air pump through a gas guiding pipe.

[0049] An installation ring 502 is rotatably sleeved outside the gas guiding cylinder 505. Connecting rods 503 are installed on both sides of the installation ring 502. Two second telescopic rods 504 are installed on the outer side wall of the cylinder body 2. The output shaft of the second telescopic rod 504 is fixedly connected to the connecting rod 503.

[0050] To further improve the stability of the gas guiding cylinder 505 installed on the rotating cylinder 4, a plurality of limit pins 506 are installed at the bottom end of the gas guiding cylinder 505. The limit pins 506 are movably inserted into the pin holes 401 at the top end of the rotating cylinder 4. The gas guiding cylinder 505 can rotate with the rotation of the rotating cylinder 4, and the gas guiding pipe connected to the stirring blade 304 thereon will not get knotted and fall off due to rotation.

[0051] Inside the rotating cylinder 4, a loading mesh cylinder 15 with an open top end is provided. The top end of the loading mesh cylinder 15 is threadedly connected to the threaded groove at the bottom end of the gas guiding cylinder 505. The inside of the loading mesh cylinder 15 is filled with activated carbon. Through the setting of the loading mesh cylinder 15 and the activated carbon, the adsorption of impurities in the pulp or the leaching of metal ions by the activated carbon method can be realized.

[0052] The rotating cylinder 4 is provided with a plurality of liquid guiding holes 402 along its radial direction. The bottom end of the rotating cylinder 4 is communicated with the top opening of the cylinder body 2 through a liquid return mechanism. The liquid return mechanism can also adopt a liquid return pipe with a liquid pump.

[0053] During use, first, a plurality of telescopic impeller assemblies 3 are clamped in the clamping grooves 403 on the outer side wall of the rotating cylinder 4 through the clamping blocks 301 to realize the rapid installation of the telescopic impeller assemblies 3.

[0054] Then, the output shaft of the second telescopic rod 504 drives the gas guiding cylinder 505 to descend and be fixed on the rotating cylinder 4 through the connecting rod 503 and the installation ring 502, which also prevents the telescopic impeller assembly 3 from running upwards during rotation. Then, the gas guiding pipe connected thereto is connected to the corresponding stirring blade 304. The air pump is started, and the gas enters the gas guiding cylinder 505 through the gas guiding pipe, and then enters the jet cavity 3041 on the stirring blade 304 through another gas guiding pipe, flushing open the conical sealing plug 3044 on the jet cavity 3041 and simultaneously driving the tension spring 3043 to stretch, and the gas is ejected.

[0055] Then, the pulp and the reagent are simultaneously poured into the cylinder body 2, and the driving motor 10 is started at the same time. The output shaft of the driving motor 10 drives the rotating cylinder 4 to rotate, and the rotating cylinder 4 drives the telescopic impeller assembly 3 to rotate in the elliptical cylinder body 2, so as to realize the mixing and stirring of the pulp and the reagent, and make them fully react. When the telescopic impeller assembly 3 rotates around the rotating cylinder 4, the spring rod 303 drives one of the stirring blades 304 thereon to continuously change positions in the cylinder body 2. One side of the stirring blade 304 rolls on the inner wall of the cylinder body 2 through the rotating wheel 306, so that the pulp in the cylinder forms a more complex flow pattern, reducing the dead angle of liquid flow, making the stirring more uniform and thorough at the same time, and the pulp flowing in through the liquid guide hole 402 on the rotating cylinder 4 flows back into the cylinder body 2 through the reflux mechanism, realizing circular flow and further improving the mixing effect.

[0056] Example 2, as Figure 9 shown, different from Example 1, the liquid return mechanism includes a liquid guide cylinder 9 with its top end connected to the bottom end of the rotating cylinder 4. The driving motor 10 is installed at the bottom end of the rotating cylinder 4. The output shaft of the driving motor 10 is connected with a rotating shaft 13 located inside the rotating cylinder 4. A spiral blade 14 slidably connected to the inner wall of the rotating cylinder 4 is installed outside the rotating shaft 13. The bottom end of the rotating cylinder 4 is connected with a liquid return pipe 8 and a liquid discharge pipe 11 with valves. The top end of the rotating shaft 13 is fixedly connected with a connecting piece 12 horizontally arranged at the bottom end inside the rotating cylinder 4.

[0057] Open the valve on the liquid return pipe 8 and close the valve on the liquid discharge pipe 11. The output shaft of the driving motor 10 drives the rotating shaft 13 and the spiral blade 14 to rotate, and the pulp can be sucked into the liquid guide cylinder 9 through the inside of the rotating cylinder 4 and then flow back into the cylinder body 2 through the liquid return pipe 8. When the pulp flows, it converges and impacts each other in the rotating cylinder 4 under the action of gravity and circulates, further improving the mixing effect, reducing the mixing dead angle, and realizing the flow of the pulp without setting an external pump body, reducing the cost.

[0058] Example 3, as Figure 10 and Figure 11 shown, different from Example 2, in order to further quickly filter out the gold-bearing adsorbents or impurities, an arc-shaped filter screen 6 that separates one side inside it is movably installed inside the cylinder body 2. The arc-shaped filter screen 6 is located between the liquid outlet of the liquid return pipe 8 and the rotating cylinder 4. An expansion rod 7 that drives the arc-shaped filter screen 6 to move up and down is installed outside the cylinder body 2;

[0059] When it is necessary to filter the pulp in the cylinder body 2, the output shaft of the expansion rod 7 drives the arc-shaped filter screen 6 to descend and install it inside the cylinder body 2 to realize the separation of the inside of the cylinder body 2. When the liquid return mechanism is started, the pulp flows into one side of the cylinder body 2 through the liquid return pipe 8 and then is filtered through the arc-shaped filter screen 6;

[0060] When using the ion exchange resin method to adsorb metal ions, the cyanided pulp is put into the arc-shaped filter screen side near the return liquid pipe 8 through the adsorption column filled with ion exchange resin. The cyanide gold complex ions in the pulp are exchanged with the exchangeable ions on the resin and adsorbed. After adsorption saturation, it is taken out, and a specific desorbent is used to desorb the resin, so that gold detaches from the resin and enters the desorbing solution, and then gold is extracted from the desorbing solution.

[0061] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A double-impeller leaching stirring tank for gold selection that is easy to clean, comprising a cylinder (2) with a plurality of support frames (1) mounted at the bottom, characterized in that: The cross section of the cylinder (2) is elliptical. A driving motor (10) is installed at the middle position of the bottom end of the cylinder (2). The output shaft of the driving motor (10) is connected to a rotating cylinder (4) located inside the cylinder (2). Two telescopic impeller assemblies (3) rotatably connected to the inside of the cylinder (2) are movably installed on the outer wall of the rotating cylinder (4). The telescopic impeller assembly (3) comprises two stirring blades (304) connected by a spring rod (303). The telescopic impeller assembly (3) further comprises two wavy stirring blades (304). The spring rod (303) is connected between the top and bottom ends of the two stirring blades (304). When the spring rod (303) is extended to a minimum length, the two stirring blades (304) are arranged side by side. A fixed rod (302) with a clamping block (301) is installed on one side of one stirring blade (304). The clamping block (301) is clamped in a clamping groove (403) on the outer wall of the rotating cylinder (4). An air guide assembly (5) connected to an air pump is installed at the top end of the rotating cylinder (4); an air outlet end of the air guide assembly (5) is connected to a telescopic impeller assembly (3) with an air jet chamber (3041) via an air guide pipe; The rotating cylinder (4) is provided with a plurality of liquid guide holes (402) along its radial direction, and the bottom end of the rotating cylinder (4) is connected to the top end opening of the cylinder body (2) via a liquid return mechanism.

2. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 1 is characterized in that: The stirring blade (304) is provided with an air guide hole, the air guide hole being connected to an air guide assembly (5) via an air guide tube, a jet cavity (3041) having jet holes at both ends is provided at the bending part of the stirring blade (304), the jet cavity (3041) and the air guide hole are communicated with each other, a tension spring (3043) is installed inside the jet cavity (3041) via a spring fixing member (3042), and both ends of the tension spring (3043) are respectively connected to a conical sealing plug (3044) located at the jet hole.

3. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 1 is characterized in that: An outwardly protruding mounting shaft (305) is mounted between the top and bottom ends of the other stirring blade (304), and a rotating wheel (306) is sleeved on the mounting shaft (305) and is rollingly connected to the inner wall of the cylinder (2).

4. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 1 is characterized in that: The air guide assembly (5) comprises an air guide cylinder (505) located at the top of the rotating cylinder (4); a rotating joint (501) is installed at the top of the air guide cylinder (505); and the other end of the rotating joint (501) is connected to an air pump via an air guide pipe; The outer portion of the air guide cylinder (505) is rotatably sleeved with a mounting ring (502), and connecting rods (503) are mounted on both sides of the mounting ring (502). Two telescopic rods (504) are mounted on the outer side wall of the cylinder body (2), and the output shaft of the telescopic rod (504) is fixedly connected to the connecting rod (503).

5. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 4 is characterized in that: A plurality of limit pins (506) are installed at the bottom end of the air guide cylinder (505), and the limit pins (506) are movably inserted into the pin holes (401) at the top end of the rotating cylinder (4).

6. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 1 is characterized in that: The liquid return mechanism comprises a liquid guide cylinder (9) whose top end is connected to the bottom end of the rotating cylinder (4); a driving motor (10) is mounted at the bottom end of the rotating cylinder (4); an output shaft of the driving motor (10) is connected to a rotating shaft (13) located inside the rotating cylinder (4); a spiral blade (14) is mounted outside the rotating shaft (13) and is slidably connected to the inner wall of the rotating cylinder (4); and a liquid return pipe (8) and a liquid discharge pipe (11) with a valve are connected to the bottom end of the rotating cylinder (4); The top end of the rotating shaft (13) is fixedly connected to a connecting piece (12) which is arranged transversely at the bottom end of the interior of the rotating cylinder (4).

7. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 4 is characterized in that: A loading net cylinder (15) with an open top is provided inside the rotating cylinder (4), the top of the loading net cylinder (15) is threadedly connected to a thread groove at the bottom of the air guide cylinder (505), and the interior of the loading net cylinder (15) is filled with activated carbon.

8. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 6 is characterized in that: The cylinder (2) is movably provided with an arc-shaped filter screen (6) for separating one side of the interior thereof; the arc-shaped filter screen (6) is located between the liquid outlet of the liquid return pipe (8) and the rotating cylinder (4); and the cylinder (2) is provided with a telescopic rod (7) for driving the arc-shaped filter screen (6) to move up and down.

9. The double-impeller leaching stirring tank for gold selection that is easy to clean according to claim 1, characterized in that: Two telescopic impeller assemblies (3) are arranged at an angle of ninety degrees on the rotating cylinder (4).

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