Method for gravity concentration one-time recovery of low-grade gold ore

Abstract

The invention discloses a low-grade gold ore gravity concentration one-time recycling method. The method comprises the steps that surrounding rock waste rocks are preliminarily crushed into crude products with the particle size smaller than 2 cm; grinding and sieving the crude product in a ball mill; an intermediate product A with the particle size smaller than 0.6 mm is screened after grinding and sieving, the intermediate product A is connected into a graded cleaning conical hopper device for graded cleaning, and an intermediate product B with the particle size larger than 0.6 mm is returned into the ball mill for continuous grinding; after the intermediate product A is treated by the graded cleaning conical hopper device, the deslimed ore pulp is output to a silt stirring pump through a discharging opening of the graded cleaning conical hopper device; the silt stirring pump mixes the deslimed ore pulp and then sends the ore pulp into the ore separation barrel, and the ore separation barrel outputs the ore pulp to the cabinet type concentrating table for separation; and middlings, concentrates and tailings are respectively discharged from the discharging areas separated by the cabinet type concentrating table. Flotation reagents are not needed, the whole recycling method is environmentally friendly and efficient, the tailings can be recycled to be used as building materials, multidirectional utilization is achieved, and the recycling efficiency and quality are improved while the recycling difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gold ore dressing, in particular to a method for one-time recovery of low-grade gold ore by gravity selection. Background Art

[0002] Gold mines are primarily composed of shallow metamorphic clastic rocks, with high gold content in the main veins. However, tunnel mining requires a fixed tunnel width, and the main veins vary in width and narrowness. Consequently, some surrounding rock is also mined during the mining process to meet tunnel width requirements. This surrounding rock waste contains between 0.3 and 0.8 grams per tonne of gold. By 2025, approximately 2 to 3 million tons of low-grade surrounding rock waste will be generated. Gold is an essential rare metal in the electronics industry, such as electronic components, chips, circuit boards, aerospace, and medical fields. However, with continued mining, resources are becoming increasingly scarce. High-quality gold ore can be processed through gravity separation combined with flotation to produce gold concentrate for smelting. However, production costs are extremely high, and large amounts of flotation reagents are required, which has a certain impact on the environment.

[0003] Therefore, a method for one-time recovery of low-grade gold ore by gravity selection is provided, which provides a safe and environmentally friendly recovery method. At the same time, the tailings can be recycled and used as building materials, realizing multi-faceted utilization. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for one-time recovery of low-grade gold ore by gravity separation, which effectively solves the technical problems existing in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions.

[0006] A method for one-time recovery of low-grade gold ore by gravity separation, characterized by comprising the following steps:

[0007] S1. Collect low-grade gold-bearing surrounding rock waste and put it into the jaw crusher for initial crushing to coarse products with a particle size of less than 2 cm;

[0008] S2, based on S1, feeds the crude product into a conical belt CNC feeder, which is connected to a ball mill, where the crude product is ground and sieved;

[0009] S3. Based on S2, the intermediate product A with a particle size of less than 0.6 mm after grinding and screening is fed into the lower end classification and cleaning conical bucket device for fine particle sand classification and cleaning, and the intermediate product B with a particle size greater than 0.6 mm is returned to the ball mill for further grinding;

[0010] S4, based on S3, after intermediate product A is processed by the graded cleaning cone bucket device, its muddy water is discharged from the countercurrent tank and connected to the mud dewatering machine for treatment; the desludging slurry is output from the discharge port of the graded cleaning cone bucket device to the mixing mud pump;

[0011] S5: Based on S4, the mixing slurry pump mixes the desludging slurry and sends it to the separation tank, which then outputs it to the cabinet-type mineral separation shaking table for separation;

[0012] S6. Based on S5, the discharge areas after sorting by the cabinet-type mineral processing shaking table are middlings, concentrates and tailings.

[0013] Preferably, a shaking table body is provided in the cabinet-type mineral processing shaking table for sorting deslimed ore pulp, and the shaking table body includes a front bed surface, a middle bed surface, a discharge bed surface and a scavenging bed surface which are connected in sequence. The outlines of the front bed surface and the middle bed surface are rectangles, the outlines of the discharge bed surface and the scavenging bed surface are symmetrical and connected right-angled triangles, and the scavenging bed surface is arranged at the tailings discharge end.

[0014] Preferably, the front bed surface includes multiple groups of first vertical edges and first gentle edges connected end to end, the first vertical edges are vertically arranged, the angle between the lower end of the first vertical edge and the lower end of the first gentle edge is 60°, and the height of the first vertical edge is 8 mm.

[0015] Preferably, the middle bed surface includes multiple groups of second vertical edges, second gentle edges and second connecting edges connected end to end, the first vertical edge is continuous with the second vertical edge, the angle between the lower end of the second vertical edge and the lower end of the second gentle edge is 60°, the upper end of the second gentle edge is connected to the second connecting edge, the second connecting edge is horizontally arranged, and the height of the second vertical edge is 5 mm.

[0016] Preferably, the discharge bed surface includes multiple groups of third vertical edges, third gentle edges and third connecting edges connected end to end, the second vertical edge is continuous with the third vertical edge, the angle between the lower end of the third vertical edge and the lower end of the third gentle edge is 60°, the upper end of the third gentle edge is connected to the third connecting edge, the third connecting edge is horizontally arranged, and the height of the third vertical edge is 2 mm.

[0017] Preferably, the length of the third connecting side is greater than twice the length of the second connecting side.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention collects low-grade surrounding rock waste containing gold, puts it into a jaw crusher, and initially crushes it into coarse products with a particle size of less than 2 cm; the coarse products are sent to a conical belt CNC feeder, which is connected to a ball mill, and the coarse products are ground and screened in the ball mill; after grinding and screening, the intermediate product A with a particle size less than 0.6 mm is connected to the lower end classification and cleaning conical bucket device for fine particle sediment classification and cleaning, and the intermediate product B with a particle size greater than 0.6 mm is returned to the ball mill for further grinding; after the intermediate product A is processed by the classification and cleaning conical bucket device, its mud water is discharged from the countercurrent trough, and the mud water is connected to the mud dewatering machine for treatment; the discharge port of the desludging slurry classification and cleaning conical bucket device is output to the stirring slurry pump; the stirring slurry pump mixes the desludging slurry and sends it to the separation barrel, and outputs it to the cabinet-type mineral processing shaking table for sorting via the separation barrel; the discharge areas after sorting by the cabinet-type mineral processing shaking table are respectively middling, concentrate and tailings. The present invention does not require flotation agents, the entire recovery method is environmentally friendly and efficient, the tailings can be recycled to make building materials, achieving multi-faceted utilization, reducing the difficulty of recovery while improving the efficiency and quality of recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Flowchart of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the graded cleaning conical bucket device of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the rocking table body of the present invention.

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of part of the structure.

[0024] Figure 5 It is a partial cross-sectional view of the front bed surface of the present invention.

[0025] Figure 6 It is a partial cross-sectional view of the middle bed surface of the present invention.

[0026] Figure 7 It is a partial cross-sectional view of the discharge bed surface of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 2 to 7As shown, a method for one-time recovery of low-grade gold ore by gravity separation includes a graded cleaning conical bucket device 1, a countercurrent trough 2, a shaking table body 3, a front bed surface 4, a middle bed surface 5, a discharge bed surface 6, a scavenging bed surface 7, a first vertical edge 8, a first gentle edge 9, a second vertical edge 10, a second gentle edge 11, a second connecting edge 12, a third vertical edge 13, a third gentle edge 14 and a third connecting edge 15.

[0029] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] like Figure 1 As shown, the method for one-time recovery of low-grade gold ore by gravity selection comprises the following steps:

[0032] S1. Collect low-grade gold-bearing surrounding rock waste and put it into the jaw crusher for initial crushing to coarse products with a particle size of less than 2 cm;

[0033] S2, based on S1, feeds the crude product into a conical belt CNC feeder, which is connected to a ball mill, where the crude product is ground and sieved;

[0034] S3. Based on S2, the intermediate product A with a particle size of less than 0.6 mm after grinding and screening is fed into the lower end classification and cleaning conical bucket device 1 for classification and cleaning of fine particles and sand, while the intermediate product B with a particle size greater than 0.6 mm is returned to the ball mill for further grinding;

[0035] S4, based on S3, after intermediate product A is processed by the graded cleaning cone bucket device 1, its muddy water is discharged from the countercurrent tank 2 and connected to the mud dewatering machine for treatment; the desludging slurry is output from the discharge port of the graded cleaning cone bucket device 1 to the mixing mud pump;

[0036] S5: Based on S4, the mixing slurry pump mixes the desludging slurry and sends it to the separation tank, which then outputs it to the cabinet-type mineral separation shaking table for separation;

[0037] S6. Based on S5, the discharge areas after sorting by the cabinet-type mineral processing shaking table are middlings, concentrates and tailings.

[0038] The sewage outlet 16 is used to discharge the suspended mud sewage; the high-pressure water pipe 17 is used to clean the intermediate product A; the conical sedimentation hopper 18 is used to precipitate the deslimed slurry and discharge it through the discharge port 19; the bracket 20 is used to support the entire grading and cleaning conical hopper device 1; the feed port 21 is used to receive the intermediate product A with a particle size of less than 0.6 mm;

[0039] A shaking table body 3 is provided in the cabinet-type mineral processing shaking table for sorting deslimed ore pulp. The shaking table body 3 includes a front bed surface 4, a middle bed surface 5, a discharge bed surface 6 and a scavenging bed surface 7 which are connected in sequence. The outlines of the front bed surface 4 and the middle bed surface 5 are rectangular, and the outlines of the discharge bed surface 6 and the scavenging bed surface 7 are symmetrical and connected right-angled triangles. The scavenging bed surface 7 is arranged at the tailings discharge end.

[0040] The front bed surface 4 includes multiple sets of first vertical edges 8 and first gentle edges 9 connected end to end. The first vertical edges 8 are vertically arranged, with the lower ends of the first vertical edges 8 and the lower ends of the first gentle edges 9 forming a 60° angle. The height of the first vertical edges 8 is 8 mm. The middle bed surface 5 includes multiple sets of second vertical edges 10, second gentle edges 11, and second connecting edges 12 connected end to end. The first vertical edges 8 are continuous with the second vertical edges 10, with the lower ends of the second vertical edges 10 and the lower ends of the second gentle edges 11 forming a 60° angle. The upper ends of the second gentle edges 11 are connected to the second connecting edges 12. The second connecting edges 12 are horizontally arranged, and the height of the second vertical edges 10 is 5 mm. The discharge bed 6 comprises multiple sets of end-to-end connected third vertical edges 13, third gentle edges 14, and third connecting edges 15. The second vertical edge 10 is continuous with the third vertical edge 13. The lower end of the third vertical edge 13 forms a 60° angle with the lower end of the third gentle edge 14, and the upper end of the third gentle edge 14 connects to the third connecting edge 15. The third connecting edge 15 is horizontally arranged, and the height of the third vertical edge 13 is 2 mm. The length of the third connecting edge 15 is greater than twice the length of the second connecting edge 12. When the selected mineral particles are sorted in the shaking table body 3, they move forward due to vibration inertia. In addition to the lateral water flow that washes away the light particles on the upper portion of the front bed 4, middle bed 5, and discharge bed 6, the trough portions of the front bed 4, middle bed 5, and discharge bed 6 gradually decrease in height due to the decreasing height of the first vertical edge 8, second vertical edge 10, and third vertical edge 13. This helps to push the light particles up and reduce their weight, achieving twice the result with half the effort and effectively improving the recovery rate and the selection effect. At the same time, the first vertical edge 8, the second vertical edge 10 and the third vertical edge 13 are all continuously arranged vertically, which protects the heavy particle minerals from being directly eroded by the cross-flowing water, so that during the operation of the mineral material on the shaking table body 3, the heavy particles are always at the bottom of the trough body of the front bed surface 4, the middle bed surface 5 and the discharge bed surface 6.

[0041] The shaking table body 3 designed in the present invention can effectively improve the recovery rate, concentration degree and productivity of gold concentrate. It does not contain resin and fiber, has no pollution to people and the environment, and is highly environmentally friendly.

[0042] In this embodiment, the basic working principle of the cabinet-type mineral processing shaking table is based on the Chinese utility model patent, publication number: CN220573712U, patent name: A cabinet-type mineral processing shaking table. The present invention makes improvements to the shaking table body 3.

[0043] The present invention does not require flotation agents, the entire recovery method is environmentally friendly and efficient, the tailings can be recycled to make building materials, achieving multi-faceted utilization, reducing the difficulty of recovery while improving the efficiency and quality of recovery.

[0044] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A method for one-time recovery of low-grade gold ore by gravity separation, characterized in that: The following steps are involved: S1. Collect low-grade gold-bearing surrounding rock waste and put it into the jaw crusher for initial crushing to coarse products with a particle size of less than 2 cm; S2, based on S1, feeds the crude product into a conical belt CNC feeder, which is connected to a ball mill, where the crude product is ground and sieved; S3, based on S2, the intermediate product A with a particle size less than 0.6 mm after grinding and screening is fed into the lower end classification and cleaning conical bucket device (1) for classification and cleaning of fine particles and sand, and the intermediate product B with a particle size greater than 0.6 mm is returned to the ball mill for further grinding; S4, based on S3, after the intermediate product A is processed by the graded cleaning cone bucket device (1), its muddy water is discharged from the countercurrent tank (2), and the muddy water is connected to the mud dewatering machine for treatment; the discharge port of the desludging slurry graded cleaning cone bucket device (1) is output to the stirring mud pump; S5: Based on S4, the mixing slurry pump mixes the desludging slurry and sends it to the separation tank, which then outputs it to the cabinet-type mineral separation shaking table for separation; S6. Based on S5, the discharge areas after sorting by the cabinet-type mineral processing shaking table are middlings, concentrates and tailings.

2. The method for one-time recovery of low-grade gold ore by gravity separation according to claim 1, characterized in that: The cabinet-type mineral processing shaking table is provided with a shaking table body (3) for separating deslimed ore pulp. The shaking table body (3) comprises a front bed surface (4), a middle bed surface (5), a discharge bed surface (6) and a scavenging bed surface (7) which are connected in sequence. The outlines of the front bed surface (4) and the middle bed surface (5) are rectangular, the outlines of the discharge bed surface (6) and the scavenging bed surface (7) are symmetrical and connected right-angled triangles, and the scavenging bed surface (7) is arranged at the tailings discharge end.

3. The method for one-time recovery of low-grade gold ore by gravity separation according to claim 2, characterized in that: The front bed surface (4) comprises a plurality of groups of first vertical edges (8) and first gentle edges (9) connected end to end, wherein the first vertical edges (8) are arranged vertically, the angle between the lower end of the first vertical edge (8) and the lower end of the first gentle edge (9) is 60°, and the height of the first vertical edge (8) is 8 mm.

4. The method for one-time recovery of low-grade gold ore by gravity separation according to claim 3, characterized in that: The middle bed surface (5) comprises a plurality of groups of second vertical edges (10), second gentle edges (11) and second connecting edges (12) connected end to end, wherein the first vertical edge (8) is continuous with the second vertical edge (10), the angle between the lower end of the second vertical edge (10) and the lower end of the second gentle edge (11) is 60°, the upper end of the second gentle edge (11) is connected to the second connecting edge (12), the second connecting edge (12) is horizontally arranged, and the height of the second vertical edge (10) is 5 mm.

5. The method for one-time recovery of low-grade gold ore by gravity separation according to claim 4, characterized in that: The discharge bed surface (6) includes multiple groups of third vertical edges (13), third gentle edges (14) and third connecting edges (15) connected end to end, the second vertical edge (10) is continuous with the third vertical edge (13), the angle between the lower end of the third vertical edge (13) and the lower end of the third gentle edge (14) is 60°, the upper end of the third gentle edge (14) is connected to the third connecting edge (15), the third connecting edge (15) is horizontally arranged, and the height of the third vertical edge (13) is 2 mm.

6. The method for one-time recovery of low-grade gold ore by gravity separation according to claim 5, characterized in that: The length of the third connecting side (15) is greater than twice the length of the second connecting side (12).

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