Comprehensive recovery method of gold ore waste rock

Abstract

The invention provides a comprehensive recovery method of gold ore waste rocks, and relates to the technical field of mineral processing. According to the comprehensive recovery method for the gold ore waste rock, lump ore screening, magnetic pulley preselection, coarse grain screening and fine grain screening are sequentially conducted on the gold ore waste rock, dense medium preselection is conducted on products on the fine grain screen, and dense medium concentrate and dense medium tailings are obtained; performing high-gradient strong magnetic pre-selection on the fine-grain undersize product to obtain high-gradient strong magnetic pre-selected concentrate and high-gradient strong magnetic pre-selected tailings; and the high-gradient strong magnetic preconcentration tailings are subjected to fine grain reselection preconcentration, and fine grain reselection preconcentration concentrate and fine grain reselection preconcentration tailings are obtained. According to the comprehensive recovery method of the gold ore waste rock, valuable elements such as gold and iron in the gold ore waste rock are comprehensively recovered through a gravity-magnetic combined mineral separation process, selected or leached raw materials which are low in mining cost and higher than the boundary grade are provided for a mine, the utilization rate of mineral resources is increased, the unit ore cost is reduced, and the service life of the mine is prolonged; and sustainable development of enterprises is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of mineral processing, and in particular to a comprehensive recovery method of gold mine waste rock. Background Art

[0002] my country's gold mineral resources are widely distributed, mainly concentrated in Shandong, Gansu, Xinjiang, Inner Mongolia, Henan and Yunnan, with the total proven reserves in the above regions accounting for 58.1%. As a national strategic resource, gold not only has important financial and monetary attributes, but also has irreplaceable application value in high-tech fields such as precision instrument manufacturing, biomedicine, electronic communications, chemical synthesis and aerospace.

[0003] Low-grade waste rock (mainly surrounding rock and interlayer) produced during gold mining is common, and its gold grade is usually between 0.1g / t-0.5g / t. According to statistics, the output of waste rock accounts for about 10%-15% of the original ore mining volume, and the current disposal methods are diversified. Some areas implement environmentally friendly soil covering and vegetation restoration, but because the particle grading of waste rock is mostly a loose porous structure of -600+200mm, it is easy to cause soil erosion control failure during the rainy season; some mines sell waste rock as building aggregate at a low price, but it is limited by the excessive sulfide and heavy metal elements in the waste rock, which limits its large-scale application; the rest of the waste rock is piled up in the spoil dump for a long time, resulting in the continuous expansion of land resource occupation, and the emergence of safety hazards and resource waste.

[0004] With the breakthrough progress of pre-selection and waste disposal technology, pre-enrichment of ore to the selected grade before selection has become the core path to reduce the cost of mineral processing. The key technical bottleneck that needs to be solved urgently is how to build a sorting system with both process simplicity and economic rationality to achieve efficient recovery of valuable elements in waste rock, while avoiding the defects of excessive investment and high energy consumption in traditional processes. Summary of the invention

[0005] The purpose of this application is to provide a comprehensive recovery method for gold mine waste rock, aiming to solve the problem that existing gold mine waste rock cannot be recycled.

[0006] To achieve the above objectives, the present application provides a comprehensive recovery method for gold mine waste rock, comprising:

[0007] The gold ore waste rock is subjected to lump ore screening to obtain lump ore overscreen products and lump ore underscreen products;

[0008] The product on the lump ore screen is subjected to magnetic pulley pre-selection to obtain magnetic pulley pre-selection concentrate and magnetic pulley pre-selection tailings;

[0009] Coarse-grained screening is performed on the magnetic pulley pre-selected concentrate and the lump ore underscreen product to obtain a coarse-grained overscreen product and a coarse-grained underscreen product;

[0010] Perform closed-circuit crushing on the product on the coarse-grain screen, and return the crushed product to the coarse-grain screening;

[0011] Perform fine-grain screening on the product under the coarse-grain screen to obtain a product on the fine-grain screen and a product under the fine-grain screen;

[0012] Perform dense-medium pre-selection on the product on the fine-grain screen to obtain dense-medium pre-selection concentrate and dense-medium pre-selection tailings;

[0013] Perform high-gradient high-intensity magnetic pre-selection on the product under the fine-grain screen to obtain high-gradient high-intensity magnetic pre-selection concentrate and high-gradient high-intensity magnetic pre-selection tailings;

[0014] Perform fine-grain gravity pre-selection on the high-gradient high-intensity magnetic pre-selection tailings to obtain fine-grain gravity pre-selection concentrate and fine-grain gravity pre-selection tailings.

[0015] In some embodiments, the screening particle size of the lump ore screening is 30 mm to 60 mm.

[0016] In some embodiments, the screening particle size of the coarse-grain screening is 10 mm to 30 mm.

[0017] In some embodiments, the screening particle size of the fine-grain screening is 0.5 mm to 3 mm.

[0018] In some embodiments, the Au grade in the dense-medium pre-selection concentrate is ≥ 1.0 g / t, and the Au grade in the dense-medium pre-selection tailings is ≤ 0.10 g / t.

[0019] In some embodiments, the separation density of the dense-medium pre-selection is 1.5 g / cm 3 ~3.2 g / cm 3 , and the dense medium is ferrosilicon powder.

[0020] In some embodiments, the Au grade in the high-gradient high-intensity magnetic pre-selection concentrate is ≥ 1.0 g / t, and the Au grade in the high-gradient high-intensity magnetic pre-selection tailings is ≤ 0.35 g / t.

[0021] In some embodiments, the magnetic field intensity of the high-gradient high-intensity magnetic pre-selection is 1.0 T to 1.7 T, and the high-gradient high-intensity magnetic pulsation impulse frequency conversion is 10 Hz to 35 Hz.

[0022] In some embodiments, the fine-grain gravity pre-selection is spiral chute pre-selection or table concentration.

[0023] In some embodiments, the pulp concentration of the spiral chute pre-selection is 15% to 25%.

[0024] Compared with the prior art, the beneficial effects of the present application include:

[0025] The comprehensive recovery method for gold mine waste rock provided by this application screens the lump ore of gold mine waste rock to obtain the oversize product and undersize product of lump ore screening; performs magnetic pulley pre-selection on the oversize product of lump ore screening to obtain the concentrate of magnetic pulley pre-selection and the tailings of magnetic pulley pre-selection; performs coarse-grained screening on the concentrate of magnetic pulley pre-selection and the undersize product of lump ore screening to obtain the oversize product and undersize product of coarse-grained screening; performs closed-circuit crushing on the oversize product of coarse-grained screening, and the crushed product is returned to coarse-grained screening; performs fine-grained screening on the undersize product of coarse-grained screening to obtain the oversize product and undersize product of fine-grained screening; performs heavy medium pre-selection on the oversize product of fine-grained screening to obtain the concentrate of heavy medium pre-selection and the tailings of heavy medium pre-selection; performs high-gradient strong magnetic pre-selection on the undersize product of fine-grained screening to obtain the concentrate of high-gradient strong magnetic pre-selection and the tailings of high-gradient strong magnetic pre-selection; performs fine-grained gravity pre-selection on the tailings of high-gradient strong magnetic pre-selection to obtain the concentrate of fine-grained gravity pre-selection and the tailings of fine-grained gravity pre-selection; combines the concentrate of heavy medium pre-selection, the concentrate of high-gradient strong magnetic pre-selection, and the concentrate of fine-grained gravity pre-selection to obtain the pre-concentrate; combines the tailings of magnetic pulley pre-selection, the tailings of heavy medium pre-selection, the tailings of high-gradient strong magnetic pre-selection, and the tailings of fine-grained gravity pre-selection to obtain the final tailings.

[0026] The comprehensive recovery method for gold mine waste rock of this application adopts a combined gravity and magnetic separation process to comprehensively recover valuable elements such as gold and iron in gold mine waste rock, providing raw materials for the mine that have a lower mining cost and are above the cut-off grade for beneficiation or leaching, improving the utilization rate of mineral resources, reducing the unit ore cost, extending the mine life, and ensuring the sustainable development of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of this application and should not be regarded as limiting the scope of this application.

[0028] Figure 1 It is a process flow diagram of the comprehensive recovery method for gold mine waste rock of this application;

[0029] Figure 2 It is an operation flow diagram of the comprehensive recovery method for gold mine waste rock in Embodiment 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] As used herein, the term:

[0031] "Prepared from" is synonymous with "comprising". As used herein, the terms "comprising", "including", "having", "containing", or any other variation thereof are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or device containing the listed elements is not necessarily limited to those elements, but may include other elements not explicitly listed or elements inherent to such composition, step, method, article, or device.

[0032] The conjunctive term "consisting of" excludes any unrecited element, step, or component. If used in a claim, this phrase renders the claim closed-ended, excluding materials other than those recited, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause within the body of a claim rather than immediately following the subject, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0033] When an equivalent, 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, it should be understood that all ranges formed by any pairing of any upper range limit or preferred value with any lower range limit or preferred value are specifically disclosed, whether or not the ranges are separately disclosed. For example, when the range "1 to 5" is disclosed, the described range should be interpreted as including the 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 herein, unless otherwise stated, the range is intended to include its end values and all integers and fractions within the range.

[0034] In these examples, unless otherwise specified, the parts and percentages are by mass.

[0035] "Parts by mass" refers to the basic measurement unit representing the mass ratio relationship of multiple components. 1 part can represent any unit mass, such as 1 g or 2.689 g, etc. If we say that the mass part of component A is a parts and the mass part of component B is b parts, it means the mass ratio of component A to component B is a:b. Or, it means the mass of component A is aK and the mass of component B is bK (K is any number representing a multiple factor). It should not be misunderstood that, different from the number of mass parts, the sum of the mass parts of all components is not limited to 100 parts.

[0036] "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).

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0038] This application provides a comprehensive recovery method for gold mine waste rock. Please refer to Figure 1 , including:

[0039] S100: Screen the gold ore waste rock into lump ore products, obtaining oversize lump ore products and undersize lump ore products;

[0040] S200: Conduct magnetic pulley pre-selection on the oversize lump ore products, obtaining magnetic pulley pre-concentrate and magnetic pulley pre-tailings;

[0041] S300: Conduct coarse screening on the magnetic pulley pre-concentrate and the undersize lump ore products, obtaining oversize coarse screening products and undersize coarse screening products;

[0042] S400: Conduct closed-circuit crushing on the oversize coarse screening products, and return the crushed products to the coarse screening;

[0043] S500: Conduct fine screening on the undersize coarse screening products, obtaining oversize fine screening products and undersize fine screening products;

[0044] S600: Conduct dense medium pre-selection on the oversize fine screening products, obtaining dense medium pre-concentrate and dense medium pre-tailings;

[0045] S700: Conduct high-gradient high-intensity magnetic pre-selection on the undersize fine screening products, obtaining high-gradient high-intensity magnetic pre-concentrate and high-gradient high-intensity magnetic pre-tailings;

[0046] S800: Conduct fine-grained gravity pre-selection on the high-gradient high-intensity magnetic pre-tailings, obtaining fine-grained gravity pre-concentrate and fine-grained gravity pre-tailings.

[0047] Merge the magnetic pulley pre-concentrate, the dense medium pre-concentrate, the high-gradient high-intensity magnetic pre-concentrate and the fine-grained gravity pre-concentrate to obtain pre-concentrate; merge the magnetic pulley pre-tailings, the dense medium pre-tailings, the high-gradient high-intensity magnetic pre-tailings and the fine-grained gravity pre-tailings to obtain final tailings.

[0048] The comprehensive recovery method of the gold ore waste rock in this application adopts a combined gravity and magnetic separation process, comprehensively recovers valuable elements such as gold and iron in the gold ore waste rock through the combined gravity and magnetic separation process, provides raw materials for mining with lower mining costs and above the cut-off grade for beneficiation or leaching for the mine, improves the utilization rate of mineral resources, reduces the unit ore cost, extends the mine life, and ensures the sustainable development of the enterprise.

[0049] In an optional embodiment, the Au grade in the gold ore waste rock is 0.10 g / t to 0.5 g / t, and the Fe grade < 15%.

[0050] In some embodiments, the screening particle size of the lump ore screening in step S100 is 30 mm to 60 mm, for example, it can be 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm or any value between 30 mm and 60 mm.

[0051] In some embodiments, the Fe grade in the pre-selected concentrate of the magnetic pulley obtained in step S200 is greater than 15%, and the Fe grade in the pre-selected tailings of the magnetic pulley is less than 10%.

[0052] In some embodiments, the screening particle size of the coarse particle screening in step S300 is 10 mm to 30 mm, and for example, it can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm or any value between 10 mm and 30 mm.

[0053] In some embodiments, the screening particle size of the fine particle screening in step S500 is 0.5 mm to 3 mm, and for example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or any value between 0.5 mm and 3 mm.

[0054] In some embodiments, the Au grade in the pre-selected concentrate of the heavy medium in step S600 is ≥ 1.0 g / t, and the Au grade in the pre-selected tailings of the heavy medium is ≤ 0.10 g / t.

[0055] Control the waste rejection yield according to the Au grades in the pre-selected concentrate of the heavy medium and the pre-selected tailings of the heavy medium.

[0056] In some embodiments, the separation density of the heavy medium pre-selection in step S600 is 1.5 g / cm 3 ~3.2 g / cm 3 , for example, it can be 1.5 g / cm 3 , 1.7 g / cm 3 , 1.9 g / cm 3 , 2.0 g / cm 3 , 2.2 g / cm 3 , 2.5 g / cm 3 , 2.7 g / cm 3 , 3.0 g / cm 3 , 3.2 g / cm 3 or any value between 1.5 g / cm 3 ~3.2 g / cm 3 , and the heavy medium is ferrosilicon powder.

[0057] In some embodiments, the Au grade in the pre-selected concentrate of the high-gradient high-intensity magnetic pre-selection in step S700 is ≥ 1.0 g / t, and the Au grade in the pre-selected tailings of the high-gradient high-intensity magnetic pre-selection is ≤ 0.35 g / t.

[0058] Control the waste rejection yield according to the Au grades in the pre-selected concentrate of the high-gradient high-intensity magnetic pre-selection and the pre-selected tailings of the high-gradient high-intensity magnetic pre-selection.

[0059] In some embodiments, the magnetic field strength of the high-gradient high-intensity magnetic pre-selection in step S700 is 1.0T to 1.7T. For example, it can be 1.0T, 1.1T, 1.2T, 1.3T, 1.4T, 1.5T, 1.6T, 1.7T, or any value between 1.0T and 1.7T. The high-gradient high-intensity magnetic pulsation impulse frequency conversion is 10Hz to 35Hz. For example, it can be 10Hz, 12Hz, 15Hz, 17Hz, 19Hz, 20Hz, 22Hz, 25Hz, 28Hz, 30Hz, 32Hz, 35Hz, or any value between 10Hz and 35Hz.

[0060] In some embodiments, the fine-grained gravity pre-selection in step S700 is spiral chute pre-selection or table concentration.

[0061] In some embodiments, the pulp concentration of the spiral chute pre-selection is 15% to 25%. For example, it can be 15%, 17%, 19%, 20%, 22%, 23%, 25%, or any value between 15% and 25%.

[0062] The following will describe the implementation solutions of the present application in detail in conjunction with specific embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. For those not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0063] Example 1

[0064] Raw materials: Oxidized ore waste from a gold ore dressing plant in Yunnan. The main valuable elements in the oxidized ore waste are Au, Ag, Cu, and TFe, and their grades are 0.31g / t, 9.81g / t, 0.06%, and 9.87% respectively.

[0065] This embodiment provides a comprehensive recovery method for gold ore waste. Please refer to Figure 2 , which specifically includes the following steps:

[0066] (1) Screen the oxidized ore waste with 40mm lump ore to obtain lump +40mm oversize product and -40mm undersize product;

[0067] (2) Conduct magnetic pulley pre-selection on the lump +40mm oversize product to obtain magnetic pulley pre-selection concentrate and magnetic pulley pre-selection tailings;

[0068] (3) Conduct 15mm coarse-grained screening on the magnetic pulley pre-selection concentrate and -40mm undersize product to obtain +15mm coarse-grained oversize product and -15mm undersize product;

[0069] (4) The products on the +15 mm coarse particle screen are subjected to closed-circuit crushing, and the crushed products are returned to the coarse particle screening;

[0070] (5) The products under the coarse particle screen are subjected to 1 mm fine particle screening to obtain products on the -15 + 1 mm fine particle screen and products under the -1 mm fine particle screen;

[0071] (6) The products on the -15 + 1 mm fine particle screen are subjected to dense medium pre-selection, with a separation density of 2.78 g / cm 3 , and the dense medium is ferrosilicon powder. Through dense medium pre-selection, dense medium pre-selection concentrate and dense medium pre-selection tailings are obtained;

[0072] (7) The products under the -1 mm fine particle screen are subjected to high-gradient strong magnetic pre-selection. The high-gradient strong magnetic pulsation impulse frequency is converted to 25 Hz, and the magnetic field intensity is 1.6 T. Through high-gradient strong magnetic pre-selection, high-gradient strong magnetic pre-selection concentrate and high-gradient strong magnetic pre-selection tailings are obtained;

[0073] (8) The high-gradient strong magnetic pre-selection tailings are subjected to fine particle shaking table pre-selection to obtain shaking table pre-selection concentrate and shaking table tailings.

[0074] The test results of the oxidized ore waste rock in Example 1 are shown in Table 1.

[0075] Table 1 Test results of oxidized ore waste rock pre-selection

[0076]

[0077] Example 2

[0078] Raw materials: Sulfide ore waste rock from a gold ore dressing plant in Shandong. The main valuable elements in the sulfide ore waste rock are Au, Ag, Cu, and TFe, and their grades are 0.37 g / t, 10.35 g / t, 0.07%, and 10.24% respectively.

[0079] This example provides a comprehensive recovery method for gold ore waste rock, which specifically includes the following steps:

[0080] (1) The sulfide ore waste rock is subjected to 30 mm lump ore screening to obtain lump +30 mm screen products and -30 mm screen products;

[0081] (2) The lump +30 mm screen products are subjected to magnetic pulley pre-selection to obtain magnetic pulley pre-selection concentrate and magnetic pulley pre-selection tailings;

[0082] (3) The magnetic pulley pre-selection concentrate and the -30 mm screen products are subjected to 12 mm coarse particle screening to obtain +12 mm coarse particle screen products and -12 mm screen products;

[0083] (4) The +12 mm coarse particle screen products are subjected to closed-circuit crushing, and the crushed products are returned to the coarse particle screening;

[0084] (5) Screen the product passing through the coarse screen for fine screening of 0.5 mm particles to obtain the product on the +0.5 mm fine screen of -12 mesh and the product passing through the -0.5 mm screen.

[0085] (6) Conduct heavy medium pre-selection on the product on the +0.5 mm fine screen of -12 mesh. The separation density is 2.89 g / cm 3 , and the heavy medium is ferrosilicon powder. Through heavy medium pre-selection, heavy medium concentrate and heavy medium tailings are obtained.

[0086] (7) Conduct high-gradient high-intensity magnetic pre-selection on the product passing through the -0.5 mm screen. The high-gradient high-intensity magnetic pulsation impact frequency is variable-frequency to 25 Hz, and the magnetic field intensity is 1.2 T. Through high-gradient high-intensity magnetic pre-selection, high-gradient high-intensity magnetic pre-selection concentrate and high-gradient high-intensity magnetic pre-selection tailings are obtained.

[0087] (8) Conduct fine particle spiral chute pre-selection on the high-gradient high-intensity magnetic pre-selection tailings. The feeding concentration of the spiral chute is 18%, and spiral chute pre-selection concentrate and spiral chute tailings are obtained.

[0088] The test results of the sulfide ore waste rock in Example 2 are shown in Table 2.

[0089] Table 2 Test results of pre-selection of sulfide ore waste rock

[0090]

[0091]

[0092] According to the method provided in this application, through the combined gravity and magnetic pre-selection process, pre-concentrate with a yield of 14.45% can be obtained from the oxidized ore waste rock. The grades of Au, Ag, Cu, and TFe in the pre-concentrate are 1.57 g / t, 37.46 g / t, 0.27%, and 37.84% respectively, and the recovery rates of Au, Ag, Cu, and TFe are 73.11%, 55.21%, 63.92%, and 55.43% respectively. Through the combined gravity and magnetic pre-selection process, pre-concentrate with a yield of 13.34% can be obtained from the sulfide ore waste rock. The grades of Au, Ag, Cu, and TFe in the pre-concentrate are 1.77 g / t, 39.03 g / t, 0.27%, and 37.50% respectively, and the recovery rates of Au, Ag, Cu, and TFe are 63.66%, 50.29%, 54.17%, and 48.86% respectively.

[0093] Through the combined gravity and magnetic pre-selection process, valuable elements such as gold and silver in the waste rock are comprehensively recovered. The enrichment effects of gold and copper are obvious, reaching the ore feed grade of the concentrator, realizing the recovery of waste rock resources, improving the utilization rate of mineral resources, and extending the mine life. At the same time, the unit cost of obtaining the selectable ore by the waste rock pre-selection process is much lower than that of open-pit mining or underground mining, reducing the production cost of resource recovery and ensuring the sustainable development of the enterprise.

[0094] 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 them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and 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.

[0095] In addition, those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims above, any one of the claimed embodiments can be used in any combination. The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those skilled in the art.

Claims

1. A comprehensive recovery method for gold mine waste rock, characterized in that Including: Carry out lump ore screening on gold mine waste rock to obtain lump ore oversize product and lump ore undersize product; Carry out magnetic pulley preselection on the lump ore oversize product to obtain magnetic pulley preselection concentrate and magnetic pulley preselection tailings; Carry out coarse particle screening on the magnetic pulley preselection concentrate and the lump ore undersize product to obtain coarse particle oversize product and coarse particle undersize product; Carry out closed-circuit crushing on the coarse particle oversize product, and return the crushed product to the coarse particle screening; Carry out fine particle screening on the coarse particle undersize product to obtain fine particle oversize product and fine particle undersize product; Carry out dense medium preselection on the fine particle oversize product to obtain dense medium preselection concentrate and dense medium preselection tailings; Carry out high-gradient strong magnetic preselection on the fine particle undersize product to obtain high-gradient strong magnetic preselection concentrate and high-gradient strong magnetic preselection tailings; Carry out fine particle gravity preselection on the high-gradient strong magnetic preselection tailings to obtain fine particle gravity preselection concentrate and fine particle gravity preselection tailings.

2. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that, The screening particle size of the lump ore screening is 30mm to 60mm.

3. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that, The screening particle size of the coarse particle screening is 10mm to 30mm.

4. The comprehensive recovery method of gold mine waste rock according to claim 1, wherein The screening particle size of the fine particle screening is 0.5mm to 3mm.

5. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that, The Au grade in the dense medium preselection concentrate is ≥1.0g / t, and the Au grade in the dense medium preselection tailings is ≤0.10g / t.

6. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that The separation density of the heavy medium pre-selection is 1.5 g / cm 3 ~3.2 g / cm 3 , and the heavy medium is ferrosilicon powder.

7. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that, The Au grade in the high-gradient strong magnetic preselection concentrate is ≥1.0g / t, and the Au grade in the high-gradient strong magnetic preselection tailings is ≤0.35g / t.

8. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that, The magnetic field intensity of the high-gradient strong magnetic preselection is 1.0T to 1.7T, and the high-gradient strong magnetic pulsation impulse frequency conversion is 10Hz to 35Hz.

9. The comprehensive recovery method of gold mine waste rock according to claim 1, characterized in that The fine particle gravity preselection is spiral chute preselection or table concentration.

10. The comprehensive recovery method of gold mine waste rock according to claim 9, characterized in that, The pulp concentration of the spiral chute preselection is 15% to 25%.

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