Design method of double-groove structure for enhancing sorting performance of spiral chute

Abstract

The invention provides a double-groove structure design method for enhancing the sorting performance of a spiral chute, and relates to the technical field of spiral chute structural design. The double-groove structure design method comprises the steps that S1, the inner diameter and the outer diameter of a first groove and the outer diameter of a second groove are selected; s2, selecting a groove spiral line form as an equiangular spiral line, and selecting equiangular spiral line spiral angles of the first groove and the second groove; s3, selecting the maximum depth and the minimum depth of the groove; s4, an adjacent angle between the first groove and the second groove is selected, and the width of the grooves and the total number of the grooves of the spiral chute are selected; s5, the vertical distance between an outlet of the second groove and an inlet of the first groove is selected; and S6, performance checking is conducted on the designed double-groove structure used for enhancing the sorting performance of the spiral chute, if the performance meets the standard, design is ended, and if the performance does not meet the standard, the steps 1-6 are repeated. Rapid and efficient design of the groove structure can be achieved, and powerful technical support is provided for improving the performance of the spiral chute.

Description

Technical Field

[0001] The invention relates to the technical field of spiral chute structure design, and in particular to a double groove structure design method for enhancing the sorting performance of a spiral chute. Background Art

[0002] The spiral chute is a separation equipment that relies on the characteristics of liquid flow to separate minerals of different densities under the action of gravity and centrifugal force. It has the advantages of simple structure, low energy consumption, no pollution, high separation efficiency, etc. It is widely used in the field of mineral separation. The surface of the traditional spiral chute is smooth. During the mineral separation process, some heavy mineral particles will be thrown to the outside of the chute under the action of centrifugal force and enter the tailings area. When the slurry moves to a certain pitch, due to the fast water flow speed, the concentration of the slurry on the chute surface increases, and the fluidity becomes worse, resulting in poor separation effect of the spiral chute.

[0003] Therefore, in recent years, many researchers have introduced special groove surface structures, such as wedge grooves and spiral grooves, to improve the sorting performance of spiral chutes. However, the parameter settings of these structures mostly rely on the engineering experience of researchers, and usually require the introduction of optimization algorithms to optimize a large number of structural parameters, while the basis or principle of structural design is not clear, which greatly limits the accuracy of spiral chute structural parameter optimization and the potential for improving spiral chute performance.

[0004] In the prior art, the publication number CN109731672A discloses a mineral processing spiral chute, which is supported and erected in a spiral shape. The radial cross-sectional curve of the trough gradually rises from the inner side of the trough to the outer side of the trough. The radial cross-sectional curve of the trough is a composite curve, which includes a first curve segment and a second curve segment arranged in sequence from the inner side of the trough to the outer side of the trough. The tail end of the first curve segment and the head end of the second curve segment are connected to a first connection point, and the angle between the curve tangent at the head end of the second curve segment and the horizontal plane is smaller than the angle between the curve tangent at the tail end of the first curve segment and the horizontal plane. The above-mentioned mineral processing spiral chute can not only expand and thin the "high wall of the sand dune" outward to improve the looseness of the mineral particles, but also increase the hourly processing capacity, so as to achieve better mineral processing efficiency and effect. However, the prior art still has shortcomings. The prior art design divides the trough into two parts, one part is used as the first curve, and the other part is used as the second curve. The two curves are processed separately. Although it can also improve the looseness of mineral particles and achieve a certain full-mine effect, the two end curves process the minerals separately. When the slurry moves to a certain pitch, due to the fast water flow speed, the slurry concentration on the trough surface becomes larger and the fluidity becomes worse, which will lead to poor sorting effect of the spiral chute.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0006] The object of the present invention is to provide a double groove structure design method for enhancing the sorting performance of a spiral chute, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A double groove structure design method for enhancing the sorting performance of a spiral chute, wherein a trough body for sorting minerals in the spiral chute is composed of an inner trough wall, an outer trough wall and a trough surface, and a groove 1 and a groove 2 are arranged on the trough surface, wherein the groove 1 is close to the inner trough wall side of the trough body, and the groove 2 is close to the outer trough wall side of the trough body, and the groove 1 and the groove 2 correspond one to one, and the specific steps include: Step 1: Select the inner diameter and outer diameter of groove 1 and groove 2; Step 2: Determine that both groove 1 and groove 2 are in the form of equiangular helical lines, and select the equiangular helical helical angles of groove 1 and groove 2; Step 3: Select the maximum depth and minimum depth of groove 1 and groove 2; Step 4: Select the adjacent angle between groove 1 and groove 2, and select the groove width and the total number of grooves of the spiral chute according to the angle between the adjacent grooves; Step 5: Select the vertical distance between the outlet of groove 2 and the inlet of groove 1; Step 6: Perform a performance check on the double groove structure designed to enhance the sorting performance of the spiral chute. If the performance meets the standard, the design is terminated. If the performance does not meet the standard, repeat steps 1 to 6.

[0008] Further, the radial distance of the zone boundary between heavy ore particles and light ore particles at the spiral chute outlet when no double grooves are provided, the outer diameter of the spiral chute and the inner diameter of the spiral chute are obtained; The range of the inner diameter of the groove is: ; in, is the inner diameter of the groove, is the outer diameter of the spiral chute, is the inner diameter of the spiral chute, It is the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet when double grooves are not provided; The range of the groove outer diameter is: ; in, is the outer diameter of the groove, The value range of groove 2 inner diameter is: ; in, is the second inner diameter of the groove; The value range of groove second outer diameter is: ; in, is the second outer diameter of the groove.

[0009] Furthermore, the helix angle constraint condition of the equiangular helix of the groove 1 and the groove 2 is: ; ; ; in, is the helix angle of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; is the helix angle constant, and ; The expression of groove 1 in polar coordinates is: ; ; in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; The expression of groove 2 in polar coordinates is: ; ; in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 2, is the helix angle of the equiangular helix of groove two.

[0010] Furthermore, when the double grooves are not provided, the radial distance between the zones of heavy ore particles and light ore particles at the outlet of the spiral chute can be obtained by numerical calculation method or experimental test method; The specific logic for obtaining the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set by numerical calculation method is to obtain the geometric parameters of the outlet of the spiral chute when double grooves are not set, and the density of the mineral to be processed, the particle diameter range, the aspect ratio of the particles, the surface roughness range of the particles and the friction coefficient between the particles are defined by the Eulerian-Lagrangian method, and the inlet pressure, outlet pressure, inlet flow rate and outlet flow rate are set by querying the historical operating conditions; the movement trajectory of the mineral particles is numerically calculated to directly obtain the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set; The specific logic for obtaining the radial distance of the boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when no double grooves are set through experimental testing is: use a measuring tool to measure the radial distance of the boundary of the ore separation zone in the stable stage, the stable stage is to measure the system flow rate, particle concentration and outlet pressure, and preset the flow rate stability range, particle concentration stability range and outlet pressure stability range. When the system flow rate, particle concentration and outlet pressure are maintained within the flow rate stability range, particle concentration stability range and outlet pressure stability range within 1 hour, it is defined that the system has reached the stable stage.

[0011] Furthermore, the maximum depth range of groove 1 and groove 2 in step 3 is: ; ; in, is the maximum depth of groove 1, is the maximum depth of groove 2; The minimum depth of groove 1 and groove 2 is 0. , i.e. flush with the groove surface of the spiral chute; The groove one and the groove two are grooves of unequal depth. The depths of the groove one and the groove two gradually decrease from the outer wall to the inner wall of the groove body until the outlets of the groove one and the groove two are flush with the groove surface.

[0012] Further, the adjacent groove angle coefficient is obtained, the number of dividing circles of the spiral chute is set, and the adjacent angle between the groove one and the groove two is selected according to the adjacent groove angle coefficient and the number of dividing circles of the spiral chute; Obtain the adjacent groove angle coefficient, set the spiral chute boundary circle, and select the adjacent angle between groove one and groove two according to the adjacent groove angle coefficient and the number of spiral chute boundary circles; The specific logic for setting the number of demarcation circles of the spiral chute is: the entrance of the spiral chute is the first circle, and the exit of the spiral chute is the Circle, obtain the concentrate flow rate of each circle of the spiral chute, set the circle with the same concentrate flow rate as the outlet circle as the boundary circle, if there is only one boundary circle, then set this circle as the spiral chute boundary circle, if there are multiple boundary circles, then set the first boundary circle as the spiral chute boundary circle; The specific formula for setting the dividing circle of the spiral chute and selecting the angle between adjacent grooves is: ; in, For the The adjacent angle between groove 1 and groove 2 in the circle; is the adjacent groove angle coefficient, is the total number of spiral chute turns, is the index of the spiral chute boundary circle, is the index of the circle, and is a real number.

[0013] Furthermore, the specific formula for selecting the total number of grooves of the spiral chute is: ; in, is the total number of grooves in the spiral chute, is the adjacent angle between groove 1 and groove 2 before the spiral flow channel Nc circle, is the adjacent angle between groove 1 and groove 2 after Nc turns of the spiral flow channel; The specific formula for selecting the groove width is: ; ; in, For the The groove width of the groove one in the circle, For the The groove width of the second groove in the circle, is the outer diameter of the groove, is the second outer diameter of the groove, is the center angle constant, and .

[0014] Furthermore, the vertical distance between the second groove outlet and the first groove inlet of each circle is in the range of: ; in, For the The circle selects the vertical distance between the outlet of groove 2 and the inlet of groove 1.

[0015] Furthermore, the specific logic for using model tests to perform performance verification on the double groove structure designed for enhancing the sorting performance of the spiral chute is as follows: based on the design structural parameters of the above grooves, groove one and groove two are processed on the existing spiral chute model. The model test includes sampling, drying, weighing each sample and calculating the yield and recovery rate of the target mineral in the concentrate zone. If the yield and recovery rate of the double groove structure designed for enhancing the sorting performance of the spiral chute are higher than those of the existing double groove structure of the spiral chute sorting performance, the design is terminated; otherwise, steps 1 to 6 are repeated.

[0016] The yield calculation formula of the target mineral in the ore belt is: ; in, is the yield of the target mineral in the ore belt, For importing all mineral quantities, is the mass of the target mineral in the concentrate zone The recovery rate of the target mineral in the ore belt is calculated as follows: ; in, is the recovery rate of the target mineral in the ore zone, is the grade of the target mineral, It is the original ore grade.

[0017] Furthermore, a numerical calculation method is used to check the performance of the double groove structure designed for enhancing the sorting performance of the spiral chute; the specific logic is as follows: a numerical simulation model is constructed based on the known structural parameters of the spiral chute and the design structural parameters of grooves one and two, the sorting efficiency of the spiral chute is calculated, and the Reynolds number of the last circle of the spiral chute is extracted. If the sorting efficiency of the double groove structure designed for enhancing the sorting performance of the spiral chute and the Reynolds number of the last circle of the spiral chute are both higher than those of the double groove structure of the existing spiral chute sorting performance, the design is terminated, otherwise, steps 1 to 6 are repeated.

[0018] The calculation formula of the sorting efficiency of the spiral chute is: ; in, is the sorting efficiency of the spiral chute, is the mass flow rate of the target solid particles A in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the non-target solid particles B in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the target solid particles A in the concentrate zone at the outlet of the spiral chute, The concentrate belt is exported from the spiral chute The mass flow rate of particle B.

[0019] The formula for extracting the Reynolds number is: ; in, is the Reynolds number of the last turn of the spiral chute, is the flow rate, is the film thickness, is the dynamic viscosity, is the slurry density.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention introduces a double groove structure on the surface of the spiral chute and systematically determines the key structural parameters of the double groove, including the spiral angle, groove width, number of grooves, inner diameter and outer diameter of the groove, etc. The double groove structure can significantly improve the looseness of the mineral particles in the spiral chute and promote the coarse ore particles to move to the inside of the chute; the design method can realize the fast and efficient design of the groove structure, providing strong technical support for improving the performance of the spiral chute. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall method flow of the present invention.

[0022] Figure 2 Overall schematic diagram of spiral chute and double groove.

[0023] Figure 3 Top view of the double groove structure of the first circle of the spiral chute.

[0024] Figure 4 Schematic diagram of numerical simulation results of radial distance of zoning boundaries.

[0025] In the figure: 1, trough body, 2, groove 1, 3, groove 2, 11 inner trough wall, 12 outer trough wall, 13, trough surface, H, chute pitch, D, spiral chute outer diameter, , inner diameter of spiral chute, , the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet when double grooves are not installed. , groove inner diameter, , the second inner diameter of the groove, , groove outer diameter, , the second outer diameter of the groove, , the vertical distance between the outlet of groove 2 and the inlet of groove 1, , the adjacent angle between groove 1 and groove 2. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Example: See also Figure 1-4 , the present invention provides a technical solution, A double groove structure design method for enhancing the sorting performance of a spiral chute, wherein a trough body 1 for sorting minerals in the spiral chute is composed of an inner trough wall 11, an outer trough wall 12 and a trough surface 13, and a groove 12 and a groove 23 are arranged on the trough surface 13, wherein the groove 12 is close to the inner trough wall side of the trough body 1, and the groove 23 is close to the outer trough wall side of the trough body 1, and the groove 12 and the groove 23 correspond one to one, and the specific steps include: Step 1: Select the inner diameter and outer diameter of groove 1 and groove 2; Obtain the radial distance of the zone boundary between heavy ore particles and light ore particles at the spiral chute outlet when no double grooves are provided, the outer diameter of the spiral chute, and the inner diameter of the spiral chute; The range of the inner diameter of the groove is: ; in, is the inner diameter of the groove, is the outer diameter of the spiral chute, is the inner diameter of the spiral chute, It is the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet when double grooves are not provided; The range of the groove outer diameter is: ; in, is the outer diameter of the groove, The value range of groove 2 inner diameter is: ; in, is the second inner diameter of the groove; The value range of groove second outer diameter is: ; in, is the second outer diameter of the groove.

[0029] When the double grooves are not provided, the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet can be obtained by numerical calculation method or experimental test method; The specific logic for obtaining the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set by numerical calculation method is as follows: the geometric parameters of the outlet of the spiral chute when double grooves are not set are obtained, the density of the mineral to be processed, the particle diameter range, the aspect ratio of the particles, the surface roughness range of the particles and the friction coefficient between the particles are defined by the Eulerian-Lagrangian method, and the inlet pressure, outlet pressure, inlet flow rate and outlet flow rate are set by querying the historical operating conditions; the movement trajectory of the mineral particles is numerically calculated to directly obtain the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set; The specific logic for obtaining the radial distance of the boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when no double grooves are set through experimental testing is: use a measuring tool to measure the radial distance of the boundary of the ore separation zone in the stable stage, the stable stage is to measure the system flow rate, particle concentration and outlet pressure, and preset the flow rate stability range, particle concentration stability range and outlet pressure stability range. When the system flow rate, particle concentration and outlet pressure are maintained within the flow rate stability range, particle concentration stability range and outlet pressure stability range within 1 hour, it is defined that the system has reached the stable stage.

[0030] Test method acquisition : Use measuring tools to measure the radial distance of the boundary of the mineralization zone during the stable stage.

[0031] Preferably, the inner diameter of the groove is 80 , the outer diameter of the groove is 150 ; The inner diameter of groove 2 is 150 , the inner diameter of the second groove is 188 .

[0032] Step 2: Determine that both groove 1 and groove 2 are in the form of equiangular helical lines, and select the equiangular helical helical angles of groove 1 and groove 2; The helix angle constraint condition of the equiangular helix of the groove 1 and the groove 2 is: ; ; ; in, is the helix angle of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; is the helix angle constant, and ; The expression of groove 1 in polar coordinates is: ; ; in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; The expression of groove 2 in polar coordinates is: ; ; in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 2, is the helix angle of the equiangular helix of groove 2. Preferably, the helix angles of the equiangular helix of groove 1 and groove 2 are 0.93 and 1.1 ,in , The helical expression of groove 1 is: ; is the diameter of the groove-groove spiral line, The helical expression of groove 2 is: ; It is the spiral line diameter of the groove. .

[0033] Step 3: Select the maximum depth and minimum depth of groove 1 and groove 2; The maximum depth range of groove 1 and groove 2 is: ; ; in, is the maximum depth of groove 1, is the maximum depth of groove 2 The minimum depth of groove 1 and groove 2 is 0. , that is, flush with the groove surface of the spiral chute.

[0034] The groove one and the groove two are grooves of unequal depth. The depths of the groove one and the groove two gradually decrease from the outer wall to the inner wall of the groove body until the outlets of the groove one and the groove two are flush with the groove surface.

[0035] Preferably, the maximum depths of the first and second grooves are selected , the minimum depth of groove 1 and groove 2 is 0 , Step 4: Select the adjacent angle between groove 1 and groove 2, and select the groove width and the total number of grooves of the spiral chute according to the angle between the adjacent grooves; The total number of grooves in the spiral chute is the total number of grooves in groove one or groove two, and the total number of grooves in groove one is equal to the total number of grooves in groove two. Obtain the adjacent groove angle coefficient, set the number of spiral chute dividing circles, and select the adjacent angle between groove one and groove two according to the adjacent groove angle coefficient and the number of spiral chute dividing circles; Obtain the adjacent groove angle coefficient, set the spiral chute boundary circle, and select the adjacent angle between groove one and groove two according to the adjacent groove angle coefficient and the number of spiral chute boundary circles; The specific logic for setting the number of demarcation circles of the spiral chute is: the entrance of the spiral chute is the first circle, and the exit of the spiral chute is the Circle, obtain the concentrate flow rate of each circle of the spiral chute, set the circle with the same concentrate flow rate as the outlet circle as the boundary circle, if there is only one boundary circle, then set this circle as the spiral chute boundary circle, if there are multiple boundary circles, then set the first boundary circle as the spiral chute boundary circle; The specific formula for setting the dividing circle of the spiral chute and selecting the angle between adjacent grooves is: ; in, For the The adjacent angle between groove 1 and groove 2 in the circle; is the adjacent groove angle coefficient, is the total number of spiral chute turns, is the index of the spiral chute boundary circle, is the index of the circle, and is a real number.

[0036] The specific formula for selecting the total number of grooves in the spiral chute is: ; in, is the total number of grooves in the spiral chute, is the adjacent angle between groove 1 and groove 2 before the spiral flow channel Nc circle, is the adjacent angle between groove 1 and groove 2 after Nc turns of the spiral flow channel; The specific formula for selecting the groove width is: ; ; in, For the The groove width of the groove one in the circle, For the The groove width of the second groove in the circle, is the outer diameter of the groove, is the second outer diameter of the groove, is the center angle constant, and .

[0037] Preferably, a numerical calculation method is used to determine the number of demarcation circles of the spiral chute. 2.5, spiral chute outlet number of turns 3.5 ; For the The adjacent angle between the circle groove 1 and the groove 2; is the adjacent groove angle coefficient, is the number of dividing circles of the spiral chute, is the circle number index; ; is the total number of grooves in the spiral chute; ; For the Groove width of groove one in the circle; ; For the The groove width of groove 2 in the circle.

[0038] Step 5: Select the vertical distance between the outlet of groove 2 and the inlet of groove 1; The range of the vertical distance between the second groove outlet and the first groove inlet of each circle is: ; in, For the Circle the vertical distance between the outlet of groove 2 and the inlet of groove 1. is the outer diameter of the groove.

[0039] The range of the vertical distance between the groove 2 outlet and the groove 1 inlet before the spiral flow channel Nc turns is: .

[0040] The range of the vertical distance between the groove 2 outlet and the groove 1 inlet after the spiral flow channel Nc turns is: .

[0041] Preferably, in the embodiment of the present invention, L is uniformly set to 10 .

[0042] Step 6: Perform a performance check on the double groove structure designed to enhance the sorting performance of the spiral chute. If the performance meets the standard, the design is terminated. If the performance does not meet the standard, repeat steps 1 to 6.

[0043] The specific logic for using model tests to perform performance verification on the double groove structure designed for enhancing the separation performance of the spiral chute is as follows: based on the design structural parameters of the above grooves, groove one and groove two are processed on the existing spiral chute model. The model test includes sampling, drying, weighing and calculating the yield and recovery rate of the target mineral in the concentrate zone. If the yield and recovery rate of the double groove structure designed for enhancing the separation performance of the spiral chute are higher than those of the double groove structure of the existing spiral chute separation performance, the design is terminated, otherwise steps 1 to 6 are repeated.

[0044] The yield calculation formula of the target mineral in the ore belt is: ; in, is the yield of the target mineral in the ore belt, For importing all mineral quantities, is the mass of the target mineral in the concentrate zone The recovery rate of the target mineral in the ore belt is calculated as follows: ; in, is the recovery rate of the target mineral in the ore zone, is the grade of the target mineral, It is the original ore grade.

[0045] The performance check of the double groove structure designed to enhance the sorting performance of the spiral chute can also be performed by numerical calculation method; the specific logic is: based on the known structural parameters of the spiral chute and the design structural parameters of groove one and groove two, a numerical simulation model is constructed to calculate the sorting efficiency of the spiral chute and extract the Reynolds number of the last circle of the spiral chute. If the sorting efficiency of the double groove structure designed to enhance the sorting performance of the spiral chute and the Reynolds number of the last circle of the spiral chute are higher than the double groove structure of the existing spiral chute sorting performance, the design is terminated, otherwise, steps 1 to 6 are repeated.

[0046] The calculation formula of the sorting efficiency of the spiral chute is: ; in, is the sorting efficiency of the spiral chute, is the mass flow rate of the target solid particles A in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the non-target solid particles B in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the target solid particles A in the concentrate zone at the outlet of the spiral chute, The concentrate belt is exported from the spiral chute The mass flow rate of particle B.

[0047] The formula for extracting the Reynolds number is: ; in, is the Reynolds number of the last turn of the spiral chute, is the flow rate, is the film thickness, is the dynamic viscosity, is the slurry density.

[0048] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0049] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0050] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0051] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A double groove structure design method for enhancing the sorting performance of a spiral chute, wherein the trough body for sorting minerals in the spiral chute is composed of an inner trough wall, an outer trough wall and a trough surface, and a groove 1 and a groove 2 are arranged on the trough surface, wherein the groove 1 is close to the inner trough wall side of the trough body, and the groove 2 is close to the outer trough wall side of the trough body, and the groove 1 and the groove 2 correspond one to one, characterized in that: The specific steps include: Step 1: Select the inner diameter and outer diameter of groove 1 and groove 2; Step 2: Determine that both groove 1 and groove 2 are in the form of equiangular helical lines, and select the equiangular helical helical angles of groove 1 and groove 2; Step 3: Select the maximum depth and minimum depth of groove 1 and groove 2; Step 4: Select the adjacent angle between groove 1 and groove 2, and select the groove width and the total number of grooves of the spiral chute according to the angle between the adjacent grooves; Step 5: Select the vertical distance between the outlet of groove 2 and the inlet of groove 1; Step 6: Perform a performance check on the double groove structure designed to enhance the sorting performance of the spiral chute. If the performance meets the standard, the design is terminated. If the performance does not meet the standard, repeat steps 1 to 6.

2. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: Obtain the radial distance of the zone boundary between heavy ore particles and light ore particles at the spiral chute outlet when no double grooves are provided, the outer diameter of the spiral chute, and the inner diameter of the spiral chute; The range of the inner diameter of the groove is: ； in, is the inner diameter of the groove, is the outer diameter of the spiral chute, is the inner diameter of the spiral chute, It is the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet when double grooves are not provided; The range of the groove outer diameter is: ； in, is the outer diameter of the groove; The value range of groove 2 inner diameter is: ； in, is the second inner diameter of the groove; The value range of groove second outer diameter is: ； in, is the second outer diameter of the groove.

3. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: When the double grooves are not provided, the radial distance between the zones of heavy ore particles and light ore particles at the spiral chute outlet can be obtained by numerical calculation method or experimental test method; The specific logic for obtaining the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set by numerical calculation method is as follows: the geometric parameters of the outlet of the spiral chute when double grooves are not set are obtained, the density of the mineral to be processed, the particle diameter range, the aspect ratio of the particles, the surface roughness range of the particles and the friction coefficient between the particles are defined by the Eulerian-Lagrangian method, and the inlet pressure, outlet pressure, inlet flow rate and outlet flow rate are set by querying the historical operating conditions; the movement trajectory of the mineral particles is numerically calculated to directly obtain the radial distance of the zoning boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when double grooves are not set; The specific logic for obtaining the radial distance of the boundary of heavy ore particles and light ore particles at the outlet of the spiral chute when no double grooves are set through experimental testing is: use a measuring tool to measure the radial distance of the boundary of the ore separation zone in the stable stage, the stable stage is to measure the system flow rate, particle concentration and outlet pressure, and preset the flow rate stability range, particle concentration stability range and outlet pressure stability range. When the system flow rate, particle concentration and outlet pressure are maintained within the flow rate stability range, particle concentration stability range and outlet pressure stability range within 1 hour, it is defined that the system has reached the stable stage.

4. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: The helix angle constraint condition of the equiangular helix of the groove 1 and the groove 2 is: ； ； ； in, is the helix angle of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; is the helix angle constant, and ; The expression of groove 1 in polar coordinates is: ； ； in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 1, is the helix angle of the equiangular helix of groove one; The expression of groove 2 in polar coordinates is: ； ； in, The groove is at the polar angle The lower diameter, is the coefficient that determines the growth rate of the equiangular helix of groove 2, is the helix angle of the equiangular helix of groove two.

5. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: The maximum depth range of groove 1 and groove 2 in step 3 is: ； ； in, is the maximum depth of groove 1, is the maximum depth of groove 2 The minimum depth of groove 1 and groove 2 is 0. , i.e. flush with the groove surface of the spiral chute; The groove 1 and the groove 2 are both grooves of unequal depth. The depths of the groove 1 and the groove 2 gradually decrease from the outer wall to the inner wall of the groove body until the outlets of the groove 1 and the groove 2 are flush with the groove surface.

6. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: Obtain the adjacent groove angle coefficient, set the spiral chute boundary circle, and select the adjacent angle between groove one and groove two according to the adjacent groove angle coefficient and the number of spiral chute boundary circles; The specific logic for setting the number of demarcation circles of the spiral chute is: the entrance of the spiral chute is the first circle, and the exit of the spiral chute is the Circle, obtain the concentrate flow rate of each circle of the spiral chute, set the circle with the same concentrate flow rate as the outlet circle as the boundary circle, if there is only one boundary circle, then set this circle as the spiral chute boundary circle, if there are multiple boundary circles, then set the first boundary circle as the spiral chute boundary circle; The specific formula for setting the dividing circle of the spiral chute and selecting the angle between adjacent grooves is: ； in, For the The adjacent angle between groove 1 and groove 2 in the circle; is the adjacent groove angle coefficient, is the total number of spiral chute turns, is the index of the spiral chute boundary circle, is the index of the circle, and is a real number.

7. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 6, characterized in that: The specific formula for selecting the total number of grooves in the spiral chute is: ； in, is the total number of grooves in the spiral chute, is the adjacent angle between groove 1 and groove 2 before the spiral flow channel Nc circle, is the adjacent angle between groove 1 and groove 2 after Nc turns of the spiral flow channel; The specific formula for selecting the groove width is: ； ； in, For the The groove width of the groove one in the circle, For the The groove width of the second groove in the circle, is the outer diameter of the groove, is the second outer diameter of the groove, is the center angle constant, and .

8. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 6, characterized in that: The range of the vertical distance between the second groove outlet and the first groove inlet of each circle is: ； in, For the The vertical distance between the second outlet of the circle groove and the first inlet of the groove, is the outer diameter of the groove.

9. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: The specific logic of using the model test to perform performance verification on the double groove structure designed for enhancing the separation performance of the spiral chute is as follows: based on the design structural parameters of the above grooves, groove one and groove two are processed on the existing spiral chute model. The model test includes sampling, drying, weighing and calculating the yield and recovery rate of the target mineral in the concentrate zone. If the yield and recovery rate of the double groove structure designed for enhancing the separation performance of the spiral chute are higher than those of the double groove structure of the existing spiral chute separation performance, the design is terminated, otherwise, steps 1 to 6 are repeated; The yield calculation formula of the target mineral in the ore belt is: ； in, is the yield of the target mineral in the ore belt, For importing all mineral quantities, is the mass of the target mineral in the concentrate zone The recovery rate of the target mineral in the ore belt is calculated as follows: ； in, is the recovery rate of the target mineral in the ore zone, is the grade of the target mineral, It is the original ore grade.

10. A double groove structure design method for enhancing the separation performance of a spiral chute according to claim 1, characterized in that: The performance of the double groove structure designed for enhancing the sorting performance of the spiral chute is checked by a numerical calculation method; the specific logic is as follows: a numerical simulation model is constructed based on the known structural parameters of the spiral chute and the design structural parameters of grooves one and two, the sorting efficiency of the spiral chute is calculated, and the Reynolds number of the last circle of the spiral chute is extracted. If the sorting efficiency of the double groove structure designed for enhancing the sorting performance of the spiral chute and the Reynolds number of the last circle of the spiral chute are higher than those of the double groove structure of the existing spiral chute sorting performance, the design is terminated, otherwise, steps 1 to 6 are repeated. The calculation formula of the sorting efficiency of the spiral chute is: ； in, is the sorting efficiency of the spiral chute, is the mass flow rate of the target solid particles A in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the non-target solid particles B in the raw ore slurry at the spiral chute inlet, is the mass flow rate of the target solid particles A in the concentrate zone at the outlet of the spiral chute, The concentrate belt is exported from the spiral chute The mass flow rate of particle B, The formula for extracting the Reynolds number is: ； in, is the Reynolds number of the last turn of the spiral chute, is the flow rate, is the film thickness, is the dynamic viscosity, is the slurry density.

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