Cooperative dehydration and acid control method for copper dump leaching residues and copper flotation tailings

Abstract

The invention provides a synergistic dehydration and acid control method for copper dump leaching residues and copper flotation tailings, and relates to the technical field of tailing treatment. The collaborative dehydration acid control method comprises the steps that copper dump leaching residues serve as a framework raw material to build a trapezoidal framework, and copper flotation tailings are stacked in grids formed by the framework in a criss-cross mode; in addition, an inverted filter layer, an anti-seepage barrier layer and a seepage drainage pipe are laid; according to the method, the length L of the grids is reasonably set, the problem of rapid and natural solidification of the copper flotation tailings is solved by utilizing the characteristic that the permeability coefficient of a copper dump leaching residue framework is high, the cost is low, meanwhile, acid production of the copper dump leaching residues is inhibited by utilizing alkaline water of the tailings, an anti-seepage barrier layer is further arranged, an acid production source of the copper dump leaching residues is further cut off, and the copper flotation tailings can be recycled. The method treats waste with waste and has obvious environmental benefits.

Description

Technical Field

[0001] The present application relates to the technical field of tailings treatment, and in particular to a method for coordinated dehydration and acid control of copper heap leaching residue and copper flotation tailings. Background Art

[0002] Copper flotation tailings are a major solid waste of copper mining enterprises. The pH value of the tailings slurry leaving the factory is 8-11. They are mainly stored in tailings ponds. Among them, wet tailings storage has the problem of long-term immersion and slow consolidation, which threatens the safety of the tailings pond, while dry tailings storage has the problem of high cost.

[0003] Low-grade copper ore is usually heap leached. Copper heap leaching slag is a large solid waste of hydrometallurgy. The pH of copper heap leaching slag is 2.5-3.5. After heap leaching is completed, the existing technology usually stores it in situ, which causes acidic water pollution.

[0004] Based on this, how to solve the problem of rapid consolidation of tailings in tailings ponds and save costs, and how to prevent and control acidic water pollution of copper heap leaching slag have become issues that need to be urgently addressed at this stage. Summary of the invention

[0005] The purpose of the present application is to provide a method for synergistically dehydrating and controlling acidity of copper heap leaching residue and copper flotation tailings, which can prevent and control the acidic water pollution of heap leaching residue while rapidly and naturally dehydrating the tailings, thereby solving the potential safety hazards and environmental pollution problems of tailings ponds and heap leaching residue fields. At the same time, in view of the problem that the grid spacing is too large, the tailings consolidation speed is slow, and the grid spacing is too small, the amount of tailings discharged is small, the present invention provides a method for determining the grid spacing, which can ensure rapid consolidation of the tailings.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] The method for collaboratively dehydrating and controlling acidity of copper heap leaching residue and copper flotation tailings provided in the present application comprises:

[0008] The copper heap leaching residue is used as a skeleton raw material to construct a trapezoidal skeleton of a stockpile, wherein the trapezoidal skeleton is crisscrossed to form a grid, and the copper flotation tailings are accumulated in the grid;

[0009] The copper flotation tailings are subjected to classification treatment to obtain various tailings including fine tailings and coarse tailings;

[0010] Laying the filter material including the coarse tailings and the copper heap leaching residue on the slope of the trapezoidal skeleton inside the grid to form a filter layer;

[0011] Laying the raw materials including the fine tailings at the bottom and top of each layer of grid and at the edge of the stockpile to form an anti-seepage barrier layer;

[0012] The bottom of the trapezoidal frame is provided with a drainage pipe for quickly discharging the tailings water generated after the copper flotation tailings are accumulated in the grid;

[0013] The distance L between two parallel and adjacent trapezoidal skeletons satisfies:

[0014]

[0015] Wherein, L is the length of a single grid, excluding the length of the upper bases of the two trapezoidal skeletons, in m; k is the average permeability coefficient of the copper heap leaching residue and the reverse filter material, in m / d; h is the height of a single layer of grid, in m; t is the consolidation time of the copper flotation tailings accumulated in a single grid, in d; ρ 水 is the density of water, take 1kg / m 3 ρ d is the dry density of the copper flotation tailings accumulated in the grid, in kg / m 3 ; d is the average width of the trapezoidal skeleton, in m; w1 is the moisture content of the tailings initially deposited in the grid, and w2 is the moisture content of the tailings after consolidation in the grid.

[0016] Preferably, the collaborative disposal method further comprises:

[0017] After the copper flotation tailings are piled up in the single-layer grid and solidified, the anti-seepage barrier layer is laid on top of the grid, the trapezoidal frame identical to the bottom stockpile is constructed, and the corresponding filter layer, the anti-seepage barrier layer, and the drainage pipe are laid.

[0018] Further preferably, after each layer of grids is built, a tailings conveying pipeline is set up on the top of the trapezoidal skeleton to convey the copper flotation tailings to the grids. After the grids are filled, the tailings conveying pipeline is removed, and after the construction of a new layer of grids is completed, a new tailings conveying pipeline is set up;

[0019] And / or, when each layer of grids is constructed, the length of each grid located inside the yard remains consistent.

[0020] Preferably, the width of the upper base of the trapezoidal frame is 1.5m-3m;

[0021] And / or, the tailings conveying pipeline comprises a tailings discharge main pipe and a tailings discharge branch pipe, the tailings discharge main pipe is used to transport the copper flotation tailings to different grid positions, and the tailings discharge branch pipe is used to discharge the tailings in the tailings discharge main pipe into the grid;

[0022] And / or, the periphery of the drainage pipe is covered with a gravel layer with a thickness of 200nm-300nm.

[0023] Further preferably, the crushed stone particle size in the crushed stone layer is 5mm-20mm;

[0024] and / or, the spacing between adjacent tailings discharge branch pipes is 5m-10m;

[0025] And / or, the diameter of the tailings discharge branch pipe is 100mm-120mm.

[0026] Preferably, the particle size of the fine tailings obtained by the classification process is less than 0.03 mm;

[0027] And / or, the particle size of the coarse tailings obtained by the classification process is greater than 0.2 mm;

[0028] And / or, in addition to the fine tailings and the coarse tailings, the classification process also obtains medium tailings, the particle size of the medium tailings is 0.03mm-0.2mm, and the medium tailings are accumulated in the grid.

[0029] Further preferably, the mass ratio of the coarse tailings and the copper heap leaching residue in the reverse filter material is (1-3): 1;

[0030] And / or, the filter layer satisfies D 15 / d 85 <4, D 15 / d 15 >4, among which, D 15 is the particle size corresponding to the content of the reverse filter layer raw material being less than 15%, d 15 and d 85 The particle sizes corresponding to the copper flotation tailings with contents less than 15% and less than 85% stored in the grid, respectively;

[0031] And / or, the thickness of the reverse filter layer is 0.3 cm-0.5 cm.

[0032] Preferably, the raw material of the anti-seepage barrier layer further comprises at least one of polyacrylamide and iron-aluminum polymer;

[0033] And / or, the moisture content of the fine tailings in the anti-seepage barrier layer raw material is 25%-30%;

[0034] And / or, the total amount of the remaining substances in the raw materials of the anti-seepage barrier layer, except for the fine tailings, is 10 mg / kg-50 mg / kg;

[0035] And / or, the thickness of the anti-seepage barrier layer is 0.1m-0.2m;

[0036] And / or, the permeability coefficient of the anti-seepage barrier layer is less than 1×10 -5 cm / s.

[0037] Preferably, k=100m / d-200m / d;

[0038] and / or, h = 0.5 m - 1 m;

[0039] and / or, t = 24h-48h;

[0040] and / or, d =2.5kg / m 3 -2.7kg / m 3 ;

[0041] and / or, d = 2m-4m;

[0042] and / or, w1=65%-70%;

[0043] And / or, w2 = 12%-18%.

[0044] Preferably, the pH of the seepage water collected by the seepage pipe is 4-5;

[0045] The seepage water is treated by adding lime to obtain CaSO4 industrial solid waste, which is dehydrated to a moisture content of 25%-30%, and a flocculant is added and stirred evenly, and then used as the raw material of the anti-seepage barrier layer.

[0046] Beneficial effects of this application:

[0047] This application uses copper heap leaching residue and copper flotation tailings for synergistic dehydration and acid control. Compared with the traditional tailings pond, the disposal method of this application utilizes copper flotation tailings in a graded manner, wherein fine tailings are used to construct an anti-seepage barrier layer, coarse tailings are used to prepare anti-filter materials, and the remaining tailings are piled in the grid. The skeleton permeability coefficient of the copper heap leaching residue is much greater than that of the piled fine tailings, and can be used as a tailings water drainage boundary, with good pore pressure dissipation capacity. Under the premise of reasonably setting the grid spacing L, the tailings water can be quickly discharged and the piled tailings can be quickly consolidated. In addition, the skeleton strength of the copper heap leaching residue is relatively high, which improves the overall shear strength and overall anti-sliding stability of the yard, and the safety is greatly improved compared to the tailings pond. Compared with the traditional copper heap leaching slag site, the collaborative dehydration and acid control method of the present application firstly organizes the acidic water and makes it easy to collect and treat; secondly, the tailings water is alkaline, which can neutralize the acidity of the copper heap leaching slag to a certain extent; thirdly, the tailings wrap the copper heap leaching slag, effectively limiting the flow of water and oxygen and reducing the generation of acidic water. At the same time, after the tailings in each layer of the grid are quickly solidified, a barrier layer is constructed with fine tailings on the top of each layer of the grid to cut off the acid source of the heap leaching slag, achieving multiple goals at one stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0049] Figure 1 A plan view of the storage yard provided for Example 1;

[0050] Figure 2 A cross-sectional view of a trapezoidal frame provided for Example 1;

[0051] Figure 3 A cross-sectional view of a storage yard provided for Example 1;

[0052] Figure 4 Diagram of the mesh tailings discharge pipeline set up in Example 1. DETAILED DESCRIPTION

[0053] As used herein:

[0054] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus. The conjunction "consisting of" excludes any unspecified element, step, or component.

[0055] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0056] In these examples, parts and percentages are by mass unless otherwise indicated.

[0057] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0058] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0059] In addition to the existence of copper flotation tailings as a large solid waste, low-grade copper mines are usually treated by heap leaching, and the resulting heap leaching slag also exists as a large solid waste of hydrometallurgy, and the pH of copper heap leaching slag is 2.5-3.5. After the heap leaching of copper mines is completed, the copper heap leaching slag is usually stored in situ. Then, after being soaked in rainwater, trace amounts of sulfuric acid, copper sulfate, and ferrous sulfate remaining in the slag will dissolve, which will lead to environmental pollution and geological safety hazards. Based on this, the inventors of the present application thought of synergistically dehydrating and controlling the acidity of copper flotation tailings and copper heap leaching slag, especially using copper heap leaching slag as a skeleton to form a grid for storing copper flotation tailings, which can achieve natural and rapid consolidation of tailings, greatly saving costs, and using fine-grained tailings to construct a copper heap leaching slag barrier layer can cut off the acid source of copper heap leaching slag.

[0060] In addition, the present application prepares fine tailings as an anti-seepage barrier layer, mainly because the current anti-seepage of tailings ponds generally adopts artificial anti-seepage material HDEP membrane, which has the disadvantages of high cost, easy aging, poor puncture resistance, and tearing will cause tailings water to leak and pollute groundwater. Once the membrane is damaged, it is extremely difficult to repair. After using fine tailings as an anti-seepage layer, it has the advantages of local materials and low cost, and there is no problem of aging and puncture leakage.

[0061] In order to quickly discharge the tailings water, each grid in the grid formed by the criss-cross trapezoidal skeleton of the present application is designed to be the same length, that is, a square grid. In addition, the present application lays a drainage pipe at the bottom of the skeleton. The drainage pipe adopts an open-hole flower pipe, which is conducive to collecting seepage water and discharging it. On the outer surface of the copper heap leaching slag skeleton at the outermost periphery of the yard, an anti-filtration layer is not laid, but an anti-seepage material formed by fine tailings is laid to form an anti-seepage barrier layer, which can prevent the seepage water in the disposal site from seeping out of the site and causing unorganized overflow and polluting the environment, and can also prevent the copper heap leaching slag itself from producing acidic water and discharging it to cause pollution. The grid skeleton structure designed in the present application has excellent anti-siltation and efficient drainage effects.

[0062] After laying the tailings conveying pipeline, the application discharges tailings near the grid frame to form a tailings deposition area. Because the permeability coefficient of the frame is large, the seepage water is quickly discharged through the frame. The tailings are discharged in layers using the "discharge-consolidation cycle" method, and the discharge height of each layer is consistent, which is 0.5m-1m. This can quickly complete the consolidation of the tailings and prevent the tailings from being piled up too high without consolidation inside.

[0063] Specifically, the seepage water from the disposal site has a pH value of 4-5 and contains heavy metals. After being collected, it is treated using the high-concentration slurry method, namely the HDS method (with the addition of lime). After the treatment meets the standards, the effluent is used for production or discharged externally in compliance with the standards. The neutralized slag produced by the treatment has a pH value of 7-9 and its main component is CaSO4. It is a Class I industrial solid waste. After being dehydrated to a moisture content of 25-30%, flocculants such as polyacrylamide, iron-aluminum salt polymers, etc. are added and stirred evenly, it can continue to be used as the outer copper heap leaching slag skeleton barrier layer around the yard and the final top barrier layer of the yard, which can effectively block the generation of acidic water and has the advantage of treating waste with waste.

[0064] In addition, in addition to the height consistency of each layer of grids, the length of each grid in the grid, that is, the distance between the skeletons, can also be consistent. However, it should be noted that because the edge of the yard is affected by the terrain, the shape and size of the edge grid are not fixed. If it is in a valley, the grid at the edge of the yard needs to be determined according to the shape of the valley.

[0065] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0066] Example 1

[0067] This embodiment provides a method for collaboratively dehydrating and controlling acidity of copper heap leaching residue and copper ore flotation tailings, comprising:

[0068] (1) The flotation tailings are subjected to cyclone classification and classified into three types of tailings: tailings with particle sizes of <0.03mm, 0.03mm-0.2mm, and >0.2mm. Among them, tailings with particle sizes of <0.03mm are used as fine tailings to construct the anti-seepage barrier layer of the storage yard, coarse tailings with particle sizes of >0.2mm are used as ingredients for the filter layer, and medium tailings with particle sizes of 0.03mm-0.2mm are piled in the constructed grid.

[0069] (2) The fine tailings after classification are concentrated until the water content reaches 25%, and then polyacrylamide is added thereto at an amount of 10 mg / kg. After stirring evenly, the tailings are laid at the bottom of the stockpile and rolled. After rolling, the thickness is ensured to be 0.75 mm and the permeability coefficient reaches 0.8×10 -5 cm / s.

[0070] (3) Construct a copper heap leaching slag skeleton grid in the yard, such as Figure 1 As shown, the skeleton is built into a trapezoidal cross section, such as Figure 2 Each grid has a length of 43.2m, a height of 0.5m, a top width of 2m, and a 0.3cm thick filter material is laid on the slopes on both sides of the frame. Figure 3 The filter material is a mixture of copper heap leaching residue and coarse tailings, with a ratio of 4:1. 15 / d 85 =2,D 15 / d 15 =100.

[0071] Among them, the length L of each grid satisfies: k is the average permeability coefficient of the copper heap leaching residue in the skeleton and the filter material in the filter layer, specifically 150m / d; h is the height of a single layer grid, specifically 0.5m; t is the consolidation time of the tailings accumulated in the grid, specifically 24h, i.e. 1d; ρ 水 is the density of water, take 1kg / m 3 ρ d is the dry density of the tailings accumulated in the grid, specifically 2.6kg / m 3 ; d is the average width of the skeleton itself, specifically 4m; w1 is the initial moisture content of the tailings discharged in the grid, specifically 68%, and w2 is the moisture content of the tailings after consolidation, specifically 15%.

[0072] A drainage pipe is laid at the bottom of the grid frame inside the grid. The drainage pipe adopts an open-hole flower pipe. The periphery of the flower pipe is covered with a 200mm thick gravel layer. The gravel layer particle size is required to be 10mm. The seepage water enters the drainage pipe through the gravel layer and all the seepage water is led to the drainage outlet. In addition, the two sides of the trapezoidal frame inside the yard are paved with anti-filtration layers. In addition to laying the frame and drainage pipe at the edge of the yard, the fine tailings anti-seepage material prepared in step (2) is also laid on the outermost side of the yard to form an anti-seepage barrier layer (thickness 0.2m) to prevent the seepage water in the yard from seeping out from the side.

[0073] (4) The tailings conveying pipeline is laid along the top of the grid frame, and the tailings are discharged vertically along the grid frame. The spacing between the tailings discharge branches is 8m, and the branch diameter is 100mm. Figure 4 shown.

[0074] (5) The pH of the seepage water at the disposal site is 4-5 and contains heavy metals. After being collected, it is treated by the high-concentration mud method, namely the HDS method (adding lime). After the treatment meets the standards, the effluent is used for production or discharged when it meets the standards. The neutralized slag produced by the treatment has a pH of 7-9 and its main component is CaSO4. It is a Class I general industrial solid waste. It is dehydrated to a moisture content of 25%, and flocculants such as polyacrylamide and iron aluminum salt polymer are added at a dosage of 50 mg / kg. After being stirred evenly, it is used as an anti-seepage barrier layer between layers and around the yard and as an anti-seepage barrier layer on the top of the yard. The thickness of the top barrier layer after laying and rolling is 0.15m, which effectively blocks the generation of acidic water.

[0075] The surface water in the grid is drained within 24 hours and the tailings are settled and consolidated.

[0076] Example 2

[0077] This embodiment provides a method for coordinated dehydration and acid control of copper heap leaching residue and copper ore flotation tailings, which is the same as that of Embodiment 1, except that the grid length L formed by the skeleton is different, specifically according to the formula satisfied by L: k is the average permeability coefficient of the copper heap leaching residue in the skeleton and the filter material in the filter layer, specifically 150m / d; h is the height of the single-layer grid, specifically 0.5m; t is the consolidation time of the tailings accumulated in the grid, specifically 48h, i.e. 2d; ρ 水 is the density of water, take 1kg / m 3 ρ d is the dry density of the tailings accumulated in the grid, specifically 2.6kg / m 3 ; d is the average width of the skeleton itself, specifically 4m; w1 is the initial moisture content of the tailings discharged in the grid, specifically 68%; w2 is the moisture content of the tailings after consolidation, specifically 15%.

[0078] The calculated length of the grid formed by the skeleton horizontally and vertically is 86.4m.

[0079] Example 3

[0080] This embodiment provides a method for coordinated dehydration and acid control of copper heap leaching residue and copper ore flotation tailings, which is the same as that of Embodiment 1, except that the length L of a single grid formed by the skeleton is different, specifically according to the formula satisfied: k is the average permeability coefficient of the copper heap leaching residue in the skeleton and the filter material in the filter layer, specifically 100m / d; h is the height of the single-layer grid, specifically 0.5m; t is the consolidation time of the tailings accumulated in the grid, specifically 24h, i.e. 1d; ρ 水 is the density of water, take 1kg / m 3 ρ d is the dry density of the tailings accumulated in the grid, specifically 2.6kg / m 3; d is the average width of the skeleton itself, specifically 4m; w1 is the initial moisture content of the tailings discharged in the grid, specifically 70%; w2 is the moisture content of the tailings after consolidation, specifically 18%.

[0081] The calculated length of the grid formed by the skeleton horizontally and vertically is 28.6m.

[0082] Comparative Example 1

[0083] This comparative example provides a method for coordinated dehydration and acid control of copper heap leaching residue and copper ore flotation tailings, which is the same as Example 1, except that the length L of a single grid is not calculated and is arbitrarily set to 200 m, resulting in a slow seepage rate of tailings water in the grid, and the clear water in the grid is not drained until 115 hours, and the tailings settle and consolidate slowly.

[0084] Comparative Example 2

[0085] This comparative example provides a method for collaborative dehydration and acid control of copper heap leaching residue and copper ore flotation tailings, which is the same as Example 1, except that the length L of a single grid is not calculated and is arbitrarily set to 100 m, resulting in insufficient drainage capacity of the grid, and the open water in the grid is not drained until 58 hours, and the tailings settle and consolidate slowly.

[0086] Comparative Example 3

[0087] This comparative example provides a method for disposing of copper ore flotation tailings, which is the same as Example 1, except that: in the skeleton material, the grid skeleton is not laid with filter material, the effluent is turbid, and the discharged tailings quickly clog the skeleton, resulting in the inability to drain the tailings water, the tailings water silting up in the grid, the tailings being unable to settle and consolidate, and the stacking failure.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 application.

[0089] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, any of the above-mentioned claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for collaborative dehydration and acid control of copper heap leaching residues and copper flotation tailings, characterized in that: include: The copper heap leaching residue is used as a skeleton raw material to construct a trapezoidal skeleton of a stockpile, wherein the trapezoidal skeleton is crisscrossed to form a grid, and the copper flotation tailings are accumulated in the grid; The copper flotation tailings are subjected to classification treatment to obtain various tailings including fine tailings and coarse tailings; Laying the filter material including the coarse tailings and the copper heap leaching residue on the slope of the trapezoidal skeleton inside the grid to form a filter layer; Laying the raw materials including the fine tailings at the bottom of each layer of grid and at the edge and top of the stockpile to form an anti-seepage barrier layer; The bottom of the trapezoidal frame is provided with a drainage pipe for quickly discharging the tailings water generated after the copper flotation tailings are accumulated in the grid; The distance L between two parallel and adjacent trapezoidal skeletons satisfies: Wherein, L is the length of a single grid, excluding the length of the upper bases of the two trapezoidal skeletons, in m; k is the average permeability coefficient of the copper heap leaching residue and the reverse filter material, in m / d; h is the height of a single layer of grid, in m; t is the consolidation time of the copper flotation tailings accumulated in a single grid, in d; ρ 水 is the density of water, take 1kg / m 3 ρ d is the dry density of the copper flotation tailings accumulated in the grid, in kg / m 3 ; d is the average width of the trapezoidal skeleton, in m; w1 is the moisture content of the tailings initially deposited in the grid, and w2 is the moisture content of the tailings after consolidation in the grid.

2. The method for co-disposal of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: Also includes: After the copper flotation tailings are piled up in the single-layer grid and solidified, the anti-seepage barrier layer is laid on top of the grid, the trapezoidal frame identical to the bottom stockpile is constructed, and the corresponding filter layer, the anti-seepage barrier layer, and the drainage pipe are laid.

3. The method for co-disposal of copper heap leaching residue and copper flotation tailings according to claim 2, characterized in that: After each layer of grids is built, a tailings conveying pipeline is set up on the top of the trapezoidal skeleton to convey the copper flotation tailings to the grids. After the grids are filled, the tailings conveying pipeline is removed, and after the construction of a new layer of grids is completed, a new tailings conveying pipeline is set up; And / or, when each layer of grids is constructed, the length of each grid located inside the yard remains consistent.

4. The method for collaborative dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: The width of the upper base of the trapezoidal frame is 1.5m-3m; And / or, the tailings conveying pipeline comprises a tailings discharge main pipe and a tailings discharge branch pipe, the tailings discharge main pipe is used to transport the copper flotation tailings to different grid positions, and the tailings discharge branch pipe is used to discharge the tailings in the tailings discharge main pipe into the grid; And / or, the periphery of the drainage pipe is covered with a gravel layer with a thickness of 200nm-300nm.

5. The method for collaborative dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 4, characterized in that: The crushed stone particle size in the crushed stone layer is 5mm-20mm; and / or, the spacing between adjacent tailings discharge branch pipes is 5m-10m; And / or, the diameter of the tailings discharge branch pipe is 100mm-120mm.

6. The method for collaborative dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: The particle size of the fine tailings obtained by the classification process is less than 0.03 mm; And / or, the particle size of the coarse tailings obtained by the classification process is greater than 0.2 mm; And / or, in addition to the fine tailings and the coarse tailings, the classification process also obtains medium tailings, the particle size of the medium tailings is 0.03mm-0.2mm, and the medium tailings are accumulated in the grid.

7. The method for collaborative dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: The mass ratio of the coarse tailings and the copper heap leaching residue in the reverse filter material is (1-3): 1; And / or, the filter layer satisfies D 15 / d 85 <4, D 15 / d 15 >4, among which, D 15 is the particle size corresponding to the content of the reverse filter layer raw material being less than 15%, d 15 and d 85 The particle sizes corresponding to the copper flotation tailings with contents less than 15% and less than 85% stored in the grid, respectively; And / or, the thickness of the reverse filter layer is 0.3 cm-0.5 cm.

8. The method for coordinated dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: The raw material of the anti-seepage barrier layer also includes at least one of polyacrylamide and iron-aluminum polymer; And / or, the moisture content of the fine tailings in the anti-seepage barrier layer raw material is 25%-30%; And / or, the total amount of the remaining substances in the raw materials of the anti-seepage barrier layer, except for the fine tailings, is 10 mg / kg-50 mg / kg; And / or, the thickness of the anti-seepage barrier layer is 0.1m-0.2m; And / or, the permeability coefficient of the anti-seepage barrier layer is less than 1×10 -5 cm / s.

9. The method for collaborative dehydration and acid control of copper heap leaching residue and copper flotation tailings according to claim 1, characterized in that: The k=100m / d-200m / d; and / or, h = 0.5 m - 1 m; and / or, t = 24h-48h; and / or, d =2.5kg / m 3 -2.7kg / m 3 ; and / or, d = 2m-4m; and / or, w1=65%-70%; And / or, w2 = 12%-18%.

10. The method for coordinated dehydration and acid control of copper heap leaching residue and copper flotation tailings according to any one of claims 1 to 9, characterized in that: The pH of the seepage water collected by the seepage pipe is 4-5; The seepage water is treated by adding lime to obtain CaSO4 industrial solid waste, which is dehydrated to a moisture content of 25%-30%, and a flocculant is added and stirred evenly, and then used as the raw material of the anti-seepage barrier layer.

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