A flotation device and method for full particle size recovery

Abstract

The application provides a full-grain-level recovery flotation device and flotation method, which comprises a conventional grain-level flotation machine, a mineral separation intermediate tank, a coarse grain-level flotation machine and a fine grain-level flotation machine. The mineral separation intermediate tank is divided into two isolated cavities. One cavity is used for recovering fine grain-level minerals which are not recovered by the conventional grain-level flotation machine and feeding the fine grain-level minerals into the fine grain-level flotation machine. The other cavity is used for recovering coarse grain-level minerals which are not recovered by the conventional grain-level flotation machine and feeding the coarse grain-level minerals into the coarse grain-level flotation machine. The application separates coarse and fine grain-level minerals during the sweeping operation, and the coarse grain-level minerals enter the short transportation area flotation machine to perform coarse grain separation, and the fine grain-level minerals enter the high-turbulence flotation machine group to perform fine grain separation, so that the low-grade mineral resources are recovered efficiently in full grain level.

Description

Technical Field

[0001] This invention relates to the field of flotation equipment technology, and in particular to a flotation device and flotation method with full particle size recovery. Background Technology

[0002] Flotation machines are one of the most important supports for realizing the flotation process. The skillful combination of different types of flotation machines is a key technology for achieving efficient separation of target and non-target minerals. With the increase in mined resources, the proportion of poor-endowed, low-grade, fine-grained, and mixed resources is increasing. The particle size distribution of grinding products changes significantly, with an increased proportion of difficult-to-float coarse and fine-grained minerals, while the content of easily floatable intermediate-grained minerals decreases. The floatability parameters of minerals of different sizes vary considerably. Conventional sequential or partial return processes cannot adapt to these changes.

[0003] Developing suitable flotation machines and process configuration technologies for both coarse and fine particle sizes would transform the current state of the mineral processing industry, improving economic and technical indicators while saving on reagent and energy consumption, and providing a method for achieving low-carbon development in the mineral processing sector. Current technologies rely on the combined configuration of different types of flotation machines to recover both coarse and fine particles. Some devices for enhanced fine particle recovery mainly employ vertical or horizontal jet pipe technology, requiring additional pumps as a power source. Alternatively, they improve recovery rates by enhancing coarse particle recovery. However, these existing technologies require processing the entire volume and all particle sizes of the slurry during enhanced recovery, resulting in high energy consumption and low efficiency. Therefore, there is a need to develop flotation equipment and methods for achieving efficient recovery of all particle sizes from low-grade mineral resources. Summary of the Invention

[0004] The purpose of this invention is to provide a flotation device and method for full-scale recovery of minerals. In the scavenging operation, coarse and fine-grained minerals are separated. The coarse-grained minerals enter the short transport zone flotation machine for coarse particle separation, and the fine-grained minerals enter the high-turbulence flotation machine for fine particle separation, thereby achieving efficient full-scale recovery of low-grade mineral resources.

[0005] According to one objective of the present invention, a flotation apparatus for full particle size recovery is provided, comprising a conventional particle size flotation machine, a mineral separation intermediate box, a coarse particle size flotation machine, and a fine particle size flotation machine. The mineral separation intermediate box is internally divided into two isolated chambers; one chamber is used to recover fine particle size minerals not recovered by the conventional particle size flotation machine and feed the fine particle size minerals into the fine particle size flotation machine; the other chamber is used to recover coarse particle size minerals not recovered by the conventional particle size flotation machine and feed the coarse particle size minerals into the coarse particle size flotation machine.

[0006] Furthermore, the number of conventional particle size flotation machines is 1-5 units.

[0007] Furthermore, the conventional particle size flotation machine includes a first transmission device, a first bubble pusher cone, a first foam tank, a first tank body, a first stator, and a first impeller. The first bubble pusher cone is inverted cone shape and is installed around the upper middle part of the first tank body. The first foam tank is installed on the inner wall of the first tank body. The first stator and the first impeller are installed at the bottom of the first tank body. The first transmission device is fixed to the top of the first tank body and is connected to the first impeller.

[0008] Furthermore, the intermediate ore sorting box includes an upper slurry inlet and a lower slurry inlet. The interior of the intermediate ore sorting box is divided into a left chamber and a right chamber by a left and right cavity partition plate. The upper slurry inlet is located in the lower middle part of the left chamber and is connected to the conventional particle size flotation machine. The bottom of the left chamber is provided with a left slurry outlet, through which the slurry is discharged into the fine particle size flotation machine. The lower slurry inlet is located at the bottom of the right chamber and is connected to the conventional particle size flotation machine. The bottom of the right chamber is provided with a right slurry outlet, through which the slurry is discharged into the coarse particle size flotation machine.

[0009] Furthermore, the left chamber is provided with a fine-particle sweeping control cone valve and a left cone valve stem, and the right chamber is provided with a right cone valve stem and a coarse-particle sweeping control cone valve.

[0010] Furthermore, the coarse-grained flotation machine includes a second pusher cone, a second froth tank, a second tank body, a second stator, a second impeller, and a guide tube. The second pusher cone consists of inner and outer parts. The inner part of the second pusher cone is inverted conical and is installed around the upper middle part of the central axis of the second tank body. The outer part of the second pusher cone is conical and is installed around the side wall of the second tank body. The upper part of the second pusher cone is 200-400mm higher than the top of the second froth tank. The second froth tank is annular and located in the middle of the second tank body. The second stator is installed on the upper end face of the guide tube. The second stator adopts trapezoidal blades and has an annular bottom plate at the bottom. The upper part of the second stator is completely open. The second impeller adopts a backward-inclined centrifugal double inverted cone form. The upper end face of the second impeller is 30-280mm lower than the upper end face of the second stator.

[0011] Furthermore, the fine-particle flotation machine includes a third bubble pusher cone, a foam expansion plate, a third foam tank, and a third tank body. The third bubble pusher cone is installed in an inverted cone shape around the upper middle part of the central axis of the third tank body, and the upper part of the third bubble pusher cone is 200-400mm higher than the top of the third foam tank. The foam expansion plate is conical and has an angle of 45-75 degrees with the tank wall of the third tank body. The third foam tank is located in a ring shape outside the foam expansion plate.

[0012] Furthermore, the fine-particle flotation machine includes an outer stator and an inner stator. The outer stator is annular, and the inner stator is cylindrical. The blades of the inner stator have an airfoil-shaped cross-section. The outer stator is provided with an eddy current strengthening plate, and the eddy current strengthening plate has an annular channel with the side wall of the third tank.

[0013] According to another objective of the present invention, the present invention provides a flotation method for full-scale recovery, comprising the following steps: Fresh slurry is fed into the first flotation machine of the conventional particle size flotation machine. After conventional particle size roughing, it is connected to the left chamber of the intermediate tank of the ore sorting via the last flotation machine. The bottom of the last flotation machine is connected to the right chamber of the intermediate tank of the ore sorting. The left chamber guides the slurry rich in fine particles into the fine particle size flotation machine for fine particle scavenging. The right chamber guides the slurry rich in coarse particles into the coarse particle size flotation machine for coarse particle scavenging. The foam from the fine particle scavenging and coarse particle scavenging operations is regrinded or scrubbed and then sent to the cleaning operation.

[0014] Furthermore, the left chamber feeds fine-grained minerals that were not recovered in the conventional particle separation operation into the fine-grained flotation machine for fine particle scavenging to recover the fine-grained target minerals; the right chamber feeds coarse-grained minerals that were not recovered in the conventional particle separation operation into the coarse-grained flotation machine for coarse particle scavenging to recover the coarse-grained minerals.

[0015] The technical solution of this invention separates coarse and fine-grained minerals in a scavenging operation. Coarse-grained minerals enter a short-transport flotation unit for coarse particle separation, while fine-grained minerals enter a high-turbulence flotation unit for fine particle separation, thereby achieving efficient recovery of low-grade mineral resources across all particle sizes. This invention creates different flotation processes based on the floatability of particles of different sizes, achieving efficient recovery based on particle size differentiation. It also facilitates precise reagent addition according to different functions of the process, enhancing reagent effectiveness and saving reagents. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 Schematic diagram of the structure of AAA; Figure 3 This is an embodiment of the present invention. Figure 1A schematic diagram of the structure of ABB in China; Figure 4 This is a schematic diagram of the structure of a conventional particle size flotation machine according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the intermediate box for mining according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 Schematic diagram of the structure in the C-direction; Figure 7 This is an embodiment of the present invention. Figure 5 Schematic diagram of the structure in the middle D direction; Figure 8 This is a schematic diagram of the coarse-grained flotation machine according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a fine-particle flotation machine according to an embodiment of the present invention; Figure 10 This is an embodiment of the present invention. Figure 9 A schematic diagram of the structure of CC; In the figure, 100 is a conventional particle size flotation machine; 101 is the first transmission device; 102 is the first bubble pusher cone; 103 is the first foam tank; 104 is the first tank body; 105 is the first stator; and 106 is the first impeller. 200. Mineral sorting intermediate box; 201. Pneumatic actuator; 202. Left cone valve stem; 203. Upper slurry inlet; 204. Lower slurry inlet; 205. Fine particle scavenging control cone valve; 206. Coarse particle scavenging control cone valve; 207. Left and right chamber partition plate; 208. Left slurry outlet; 209. Right slurry outlet; 210. Left chamber; 211. Right chamber; 212. Right cone valve stem; 300. Coarse-grained flotation machine; 301. Second transmission device; 302. Second bubble pusher cone; 303. Second froth tank; 304. Second tank body; 305. Second stator; 306. Second impeller; 307. Guide tube; 308. Guide bottom; 400. Fine-grained flotation machine; 401. Third transmission device; 402. Third bubble pusher cone; 403. Foam expansion plate; 404. Third foam tank; 405. Eddy current reinforcement plate; 406. Outer stator; 407. Inner stator; 408. Third tank body; 409. Third impeller. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example 1 like Figure 1 As shown, a flotation device for full particle size recovery includes a conventional particle size flotation machine 100, a sorting intermediate tank 200, a coarse particle size flotation machine 300, and a fine particle size flotation machine 400. The conventional particle size flotation machine 100 generally consists of 1-5 flotation machines (the specific number is determined by the flotation time). Fresh ore pulp is fed into the first flotation machine of the roughing operation (composed of the conventional particle size flotation machine 100), and the tailings from the roughing operation enter the sorting intermediate tank 200.

[0022] like Figure 2 and Figure 3 As shown, the intermediate ore separator 200 is internally divided into two isolated chambers, each with an inlet and an outlet. The inlet of the left chamber is located in the lower part, and the outlet is at the bottom. The inlet and outlet of the right chamber are both at the bottom. The left chamber feeds fine-grained minerals not recovered in conventional particle separation into a fine-particle scavenging process (composed of a fine-particle flotation machine 400) to recover the fine-grained target minerals. The right chamber feeds coarse-grained minerals not recovered in conventional particle separation into a coarse-particle scavenging process (composed of a coarse-particle flotation machine 300) to recover the coarse-grained minerals.

[0023] like Figure 4As shown, the conventional particle size flotation machine 100 includes a first transmission device 101, a first bubble pusher cone 102, a first foam tank 103, a first tank body 104, a first stator 105, and a first impeller 106. The first transmission device 101 is driven by a belt, a reducer, or a direct-drive motor. The first bubble pusher cone 102 is an inverted cone shape, 90-120 degrees, and is mounted around the upper middle part of the flotation machine's central shaft, with its upper part higher than the top of the first foam tank 103. The first foam tank 103 consists of an annular foam tank and a radial foam tank mounted on the inner wall of the first tank body 104. The first stator 105 and the first impeller 106 are mounted at the bottom of the first tank body 104. The first transmission device 101 drives the first impeller 106 to rotate. The first stator 105 uses trapezoidal blades, has an annular bottom plate, and is completely open at the top. The first impeller 106 adopts a backward-inclined centrifugal double inverted cone design, with blades evenly distributed circumferentially in the central area of ​​the impeller.

[0024] like Figure 5 , Figure 6 and Figure 7 As shown, the intermediate ore sorting tank 200 includes a left cone valve stem 202, an upper slurry inlet 203, a lower slurry inlet 204, a fine particle scavenging control cone valve 205, a coarse particle scavenging control cone valve 206, a left and right chamber partition plate 207, a left slurry outlet 208, a right slurry outlet 209, a left chamber 210, a right chamber 211, and a right cone valve stem 212. The intermediate ore sorting tank 200 is divided into two chambers, left and right, by the left and right chamber partition plate 207. The upper slurry inlet 203 is located in the lower middle part of the left chamber and is connected to the flotation machine in the previous operation. The left chamber 210 is equipped with the fine particle scavenging control cone valve 205 and the left cone valve stem 202. The slurry is discharged from the left slurry outlet 208 and enters the fine particle flotation machine 400. The lower inlet 204 is located at the bottom of the right chamber 211. The right chamber 211 is equipped with 2-3 right cone valve stems 212 and a coarse particle scavenging control cone valve 206 to control the flow rate. The slurry is discharged from the right outlet 209 and enters the coarse particle flotation machine 300.

[0025] The pneumatic actuator 201 is located directly above the intermediate box 200 of the ore distribution. The housing of the pneumatic actuator 201 is connected to the intermediate box 200 of the ore distribution. The piston rod of the pneumatic actuator 201 is connected to the valve rod 202 of the left cone valve and the valve rod 212 of the right cone valve, thereby driving the cone valve to open and close.

[0026] like Figure 8As shown, the coarse-grained flotation machine 300 includes a second transmission device 301, a second bubble pusher cone 302, a second froth tank 303, a second tank body 304, a second stator 305, a second impeller 306, a guide tube 307, and a guide bottom 308. The second transmission device 301 is driven by a belt, a reducer, or a direct-drive motor. The second bubble pusher cone 302 consists of inner and outer parts. The inner part is an inverted cone (cone angle 90-120 degrees) and is installed around the upper middle part of the flotation machine's central shaft. The outer part is conical and is installed around the side wall of the flotation machine. Both parts are 200-400 mm higher than the top of the second froth tank 303. The second froth tank 303 is located in a ring shape in the middle of the flotation machine. The second stator 305 is installed on the upper end face of the guide tube 307. The second stator 305 uses trapezoidal blades, has an annular bottom plate, and is completely open at the top. The second impeller 306 adopts a backward-inclined centrifugal double-cone design, with blades evenly distributed circumferentially in the central area of ​​the multi-hole air distributor. The second impeller 306 is mounted at the end of the shaft, in the middle of the second trough 304, and in the central area of ​​the second stator 305. The upper surface of the second impeller 306 is 30-280mm lower than the upper surface of the second stator 305. The guide bottom 308 is located in the lower part of the second trough 304 and is fixed to the bottom of the second trough 304 via support legs. The guide cylinder 307 is installed above the center of the guide bottom 308.

[0027] like Figure 9 and Figure 10 As shown, the fine-particle flotation machine 400 includes a third transmission device 401, a third bubble pusher cone 402, a foam expansion plate 403, a third foam tank 404, a vortex strengthening plate 405, an outer stator 406, an inner stator 407, a third tank body 408, and a third impeller 409. The third transmission device 401 is driven by a belt, a reducer, or a direct-drive motor. The third bubble pusher cone 402 is an inverted cone (cone angle 100-150 degrees) and is mounted around the upper part of the flotation machine's central shaft, with its upper part 200-400 mm higher than the top of the third foam tank 404. The foam expansion plate 403 is conical with an angle of 45-75 degrees to the tank wall and is located on the upper part of the third tank body 408. The third foam tank 404 is annular and located outside the foam expansion plate 403.

[0028] The fine-grained flotation machine 400 has a double-layered stator. The outer stator 406 is annular, with square or circular holes on its blades and an open upper surface. The inner stator 407 is cylindrical, with a sealing plate at the upper end and a number of circular holes arranged therein, and a mounting and fixing ring at the lower end. The stator blades of the inner stator are also designed with square or circular holes, and the cross-section of the blades is airfoil-shaped. The eddy current strengthening plate 405 is located around the outer stator 406 and has an annular channel with the side wall of the third tank 408. The third impeller 409 has double-inverted conical straight blades, with 8-16 blades evenly distributed circumferentially.

[0029] The eddy current strengthening plate of the fine-particle flotation machine 400 is cylindrical and located on the periphery of the outer stator 406, with an annular channel between it and the side wall of the third tank 408. The radial distance between the eddy current strengthening plate and the stator blades can be adjusted. The lower end of the eddy current strengthening plate is 200-600mm from the bottom of the tank, and the upper end face is flush with the lower end of the sprue plate.

[0030] The flotation process of this invention consists of conventional size roughing, coarse scavenging, and fine scavenging. The underflow from conventional size roughing is divided into two slurries, one of which enters the coarse scavenging and the other enters the fine scavenging.

[0031] The flotation system for this process consists of a conventional particle size flotation machine 100, a sorting intermediate tank 200, a coarse particle size flotation machine 300, and a fine particle size flotation machine 400. The underflow from the conventional particle size roughing operation is divided into two slurry streams, which enter the fine particle scavenging operation and the coarse particle scavenging operation, respectively. Specifically, fresh slurry is fed into the first flotation machine of the conventional particle size roughing operation. The middle section of the last flotation machine of the conventional particle size roughing operation is connected to the left chamber of the sorting intermediate tank 200, and the bottom section is connected to the right chamber of the sorting intermediate tank 200. The left chamber guides the fine-particle-rich slurry into the fine particle scavenging operation, and the right chamber guides the coarse-particle-rich slurry into the coarse particle scavenging operation. The froth from the fine particle scavenging and coarse particle scavenging operations is regrinded or scrubbed before entering the cleaning operation.

[0032] This invention creates different flotation processes based on the floatability of particles of different sizes, achieving efficient recovery based on particle size differentiation. It also facilitates precise reagent addition according to different functions of the process, enhancing reagent effectiveness and saving reagents.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flotation device for full-scale recovery, characterized in that, The flotation system includes a conventional particle size flotation machine, a mineral separation intermediate box, a coarse-grained flotation machine, and a fine-grained flotation machine. The mineral separation intermediate box is internally divided into two isolated chambers. One chamber is used to recover fine-grained minerals that were not recovered by the conventional particle size flotation machine and feed these fine-grained minerals into the fine-grained flotation machine. The other chamber is used to recover coarse-grained minerals that were not recovered by the conventional particle size flotation machine and feed these coarse-grained minerals into the coarse-grained flotation machine. The conventional particle size flotation machine includes a first transmission device, a first bubble pusher cone, a first froth tank, a first tank body, a first stator, and a first impeller. The first bubble pusher cone is inverted conical in shape. The first bubble pusher cone is mounted around the upper middle part of the first tank body, the first foam tank is mounted on the inner wall of the first tank body, the first stator and the first impeller are mounted at the bottom of the first tank body, the first transmission device is fixed at the top of the first tank body, and the first transmission device is connected to the first impeller; the intermediate ore sorting box includes an upper slurry inlet and a lower slurry inlet, the interior of the intermediate ore sorting box is divided into a left chamber and a right chamber by a left and right cavity partition plate, the upper slurry inlet is located in the lower middle part of the left chamber, the upper slurry inlet is connected to the conventional particle size flotation machine, and the bottom of the left chamber is provided with a left slurry outlet, the slurry is fed by the... The slurry is discharged from the left outlet into the fine-grained flotation machine; the lower inlet is located at the bottom of the right chamber and is connected to the conventional particle size flotation machine; the bottom of the right chamber has a right outlet, through which the slurry is discharged into the coarse-grained flotation machine; the coarse-grained flotation machine includes a second bubble pusher cone, a second froth tank, a second tank body, a second stator, a second impeller, and a guide cylinder; the second bubble pusher cone consists of inner and outer parts, the inner part of the second bubble pusher cone is inverted cone-shaped and is installed around the upper middle part of the central axis of the second tank body, and the outer part of the second bubble pusher cone is conical and is installed around the side of the second tank body. The second foam tank is annular and located in the middle of the second tank body. The second stator is installed on the upper end face of the guide tube. The bottom of the second stator is provided with an annular bottom plate, and the upper part of the second stator is completely open. The second impeller adopts a backward-inclined centrifugal double inverted cone form. The fine-particle flotation machine includes a third foam pusher cone, a foam expansion plate, a third foam tank, and a third tank body. The third foam pusher cone is inverted cone shape and is installed around the upper middle part of the central axis of the third tank body. The foam expansion plate is conical and has an angle of 45-75 degrees with the tank wall of the third tank body. The third foam tank is annular and located on the outside of the foam expansion plate.

2. The flotation device for full-scale recovery according to claim 1, characterized in that, The number of conventional particle size flotation machines is 1-5.

3. The flotation device for full-scale recovery according to claim 1, characterized in that, The left chamber is equipped with a fine-particle sweeping control cone valve and a left cone valve stem, while the right chamber is equipped with a right cone valve stem and a coarse-particle sweeping control cone valve.

4. The flotation device for full-scale recovery according to claim 1, characterized in that, The fine-grained flotation machine includes an outer stator and an inner stator. The outer stator is annular, and the inner stator is cylindrical. The blades of the inner stator have an airfoil-shaped cross-section. The outer stator is surrounded by an eddy current enhancement plate, and the eddy current enhancement plate has an annular channel with the side wall of the third tank.

5. A flotation method for full-scale recovery based on the flotation apparatus of claim 1, characterized in that, Includes the following steps: Fresh slurry is fed into the first flotation machine of the conventional particle size flotation system. After conventional particle size roughing, it is connected to the left chamber of the intermediate ore separation tank via the last flotation machine. The bottom of the last flotation machine is connected to the right chamber of the intermediate ore separation tank. The left chamber guides the slurry rich in fine particles into the fine particle size flotation machine for fine particle scavenging, while the right chamber guides the slurry rich in coarse particles into the coarse particle size flotation machine for coarse particle scavenging. The foam from the fine particle scavenging and coarse particle scavenging operations is regrinded or scrubbed and then sent to the cleaning operation. The left chamber feeds the fine particles that were not recovered in the conventional particle size separation operation into the fine particle size flotation machine for fine particle scavenging to recover the fine particles of the target mineral. The right chamber feeds coarse minerals that were not recovered in the conventional particle separation operation into the coarse flotation machine for coarse scavenging to recover the coarse minerals.

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