Beneficiation method for pre-selecting and discarding waste in tungsten ore reselection section

Abstract

The invention belongs to the technical field of beneficiation, and particularly relates to a beneficiation method for conducting pre-selection and waste throwing on a tungsten ore reselection section. According to the method, after the first oversize product and the second middling are subjected to waste throwing and mineral separation, jigging and table mineral separation are conducted, the operation yield of the first waste throwing and mineral separation and the second waste throwing and mineral separation is larger than 50% (the total yield of the tailings obtained through the first waste throwing and mineral separation and the second waste throwing and mineral separation to the tungsten ore to be separated is larger than 36%), and a certain effect is achieved for improving the WO3 grade and the recovery rate of WO3 of obtained reselected rough sand; the WO3 grade of the obtained reselection raw sand is larger than 35%, the recovery rate of WO3 is larger than 86%, it is guaranteed that the WO3 grade and the recovery rate of the reselection raw sand are not lower than those of the reselection raw sand before the pre-selection waste throwing operation is added, the ore quantity of ore grinding and the ore quantity entering the follow-up table concentrator operation can be effectively reduced, the ore grinding operation cost and the table concentrator set number are reduced, and cost reduction and efficiency improvement of enterprises are achieved; and the method is suitable for reselection section waste throwing of small tungsten mines.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and in particular relates to an ore dressing method for pre-selecting and discarding waste from a heavy selection section of tungsten ore. Background Art

[0002] The reserves of high-grade, easy-to-select tungsten ore are decreasing, and the proportion of low-grade, difficult-to-select ore has increased significantly, resulting in higher and higher production costs. In order to meet the growing demand for mineral products, the large-scale development and utilization of low-grade mineral resources is an inevitable trend, and the introduction of waste disposal technology and equipment is particularly important for reducing costs and increasing efficiency.

[0003] In recent years, with the application of intelligent ore sorting machines in the roughing section of tungsten ore and the application of heavy medium beneficiation systems in the heavy separation section, tungsten ore has achieved certain results in mechanized replacement of workers and intelligent reduction of manpower. However, due to the large equipment investment, large land occupation and high cost per ton of ore, the promotion prospect of heavy medium beneficiation system in small tungsten mines is not optimistic. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a tungsten ore beneficiation method for pre-selecting and discarding waste from the re-selection section of the tungsten ore, which can improve the WO3 grade and WO3 recovery rate of the re-selection rough sand, reduce the production cost, and is suitable for application in small tungsten mines that process less than 300,000 tons of raw ore annually.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a method for pre-selecting and discarding waste from a tungsten ore reselection section, comprising the following steps:

[0007] The tungsten ore to be selected is subjected to double-layer sieving and grading to obtain first oversize, intermediate and first undersize respectively;

[0008] The first oversize material is subjected to first waste beneficiation to obtain first intermediate ore and first tailings, respectively, wherein the operating yield of the first waste beneficiation is greater than 50%, and the yield of the first tailings to the tungsten ore to be beneficiated is greater than 16%;

[0009] The intermediate is subjected to a first jigging beneficiation to obtain a first coarse concentrate and a second intermediate ore respectively;

[0010] The second intermediate ore is subjected to a second discarding and beneficiation to obtain a third intermediate ore and a second tailings, respectively, wherein the operating yield of the second discarding and beneficiation is greater than 50%, and the yield of the second tailings to the tungsten ore to be beneficiated is greater than 20%;

[0011] After combining the first intermediate ore and the third intermediate ore, dehydration, grinding and second jigging are sequentially performed to obtain a second coarse concentrate and a fourth intermediate ore;

[0012] Screening and grading the fourth intermediate ore to obtain a fourth intermediate ore oversize and a fourth intermediate ore undersize;

[0013] The fourth intermediate ore underscreen is subjected to first shaking table beneficiation to obtain a third coarse concentrate, a fifth intermediate ore and a third tailings respectively;

[0014] The first undersize material is subjected to a third jigging process to obtain a fourth coarse concentrate and a sixth intermediate ore respectively;

[0015] The sixth intermediate ore is subjected to second shaking table beneficiation to obtain a fifth rough concentrate, a seventh intermediate ore and a fourth tailings respectively;

[0016] The first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are gravity separation rough sand;

[0017] The WO3 grade of the re-selected rough sand is greater than 35%, and the WO3 recovery rate is greater than 86%.

[0018] Preferably, the method further comprises: returning the fourth intermediate ore overscreen, the fifth intermediate ore and the seventh intermediate ore to be ground again.

[0019] Preferably, the double-layer sieve includes a large-aperture sieve and a small-aperture sieve; the large-aperture sieve is a 6-10 mm sieve; and the small-aperture sieve is a 1-2 mm sieve.

[0020] Preferably, the screen used for the screening and grading is consistent with the small-aperture screen in the double-layer sieve grading.

[0021] Preferably, the WO3 grade of the tungsten ore to be selected is 0.2-0.3%.

[0022] Preferably, the grinding is rod grinding, and the mass concentration of the material during the grinding process is 60-70%.

[0023] Preferably, the WO3 grade of the tungsten ore to be selected is 0.2-0.3%.

[0024] Preferably, the WO3 grade of the first intermediate ore is 0.2-0.25%, and the WO3 grade of the first tailings is 0.02-0.03%;

[0025] The WO3 grade of the third intermediate ore is 0.2-0.25%, and the WO3 grade of the second tailings is 0.02-0.03%.

[0026] Preferably, the WO3 grade of the first rough concentrate is 50-60%, and the WO3 grade of the second medium ore is 0.10-0.15%;

[0027] The WO3 grade of the second rough concentrate is 50-60%, and the WO3 grade of the fourth intermediate ore is 0.10-0.15%;

[0028] The WO3 grade of the fourth coarse concentrate is 50-60%, and the WO3 grade of the sixth intermediate ore is 0.10-0.15%.

[0029] Preferably, the WO3 grade of the third rough concentrate is 20-30%, the WO3 grade of the fifth intermediate ore is 0.10-0.15%, and the WO3 grade of the third tailings is 0.02-0.03%;

[0030] The WO3 grade of the fifth coarse concentrate is 20-30%, the WO3 grade of the seventh intermediate ore is 0.10-0.15%, and the WO3 grade of the fourth tailings is 0.02-0.03%.

[0031] The present invention provides a ore dressing method for pre-selecting and discarding waste in a tungsten ore reselection section, comprising the following steps: performing double-layer screening classification on the tungsten ore to be selected, respectively obtaining a first screen oversize, an intermediate and a first screen undersize; performing first screen oversize on the first screen oversize on the first discarding and beneficiation, respectively obtaining a first intermediate ore and a first tailing, wherein the operating yield of the first discarding and beneficiation is greater than 50%, and the yield of the first tailing to the tungsten ore to be selected is greater than 16%; performing first jigging beneficiation on the intermediate, respectively obtaining a first coarse concentrate and a second intermediate ore; performing second discarding and beneficiation on the second intermediate ore, respectively obtaining a third intermediate ore and a second tailing, wherein the operating yield of the second discarding and beneficiation is greater than 50%, and the yield of the second tailing to the tungsten ore to be selected is greater than 20%; performing first intermediate ore and third intermediate ore on the intermediate After the ores are merged, dehydration, grinding and second jig separation are carried out in sequence to obtain a second rough concentrate and a fourth intermediate ore; the fourth intermediate ore is screened and graded to obtain a fourth intermediate ore oversize and a fourth intermediate ore undersize; the fourth intermediate ore undersize is subjected to a first shaking table separation to obtain a third rough concentrate, a fifth intermediate ore and a third tailings; the first undersize is subjected to a third jig separation to obtain a fourth rough concentrate and a sixth intermediate ore; the sixth intermediate ore is subjected to a second shaking table separation to obtain a fifth rough concentrate, a seventh intermediate ore and a fourth tailings; the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are re-selected rough sand; the WO3 grade of the re-selected rough sand is greater than 35%, and the WO3 recovery rate is greater than 86%. The present invention performs jigging + shaking table separation after discarding the first screen material and the second medium ore. The operating yield of the first and second discarding separations is greater than 50% (the total yield of the tailings obtained from the first and second discarding separations for the tungsten ore to be selected is greater than 36%), which has a certain effect on improving the WO3 grade of the obtained gravity separation rough sand and the recovery rate of WO3. The WO3 grade of the obtained gravity separation rough sand is greater than 35%, and the recovery rate of WO3 is greater than 86%, ensuring that the WO3 grade and recovery rate of the gravity separation rough sand are not lower than those before adding the pre-selection discarding operation, and can effectively reduce the amount of ore to be ground and the amount of ore entering the subsequent shaking table operation, reduce the grinding operation cost and the number of shaking table sets, achieve cost reduction and efficiency improvement for enterprises, and is suitable for the gravity separation of small tungsten mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the continuous discharge jig equipment;

[0033] Figure 2 It is a front view of the continuous discharge jig equipment;

[0034] Figure 3 It is a schematic diagram of a heavy material gate valve and a light material gate valve in a continuous discharge jig equipment;

[0035] Figure 4 It is a top view of the continuous discharge jig equipment;

[0036] Figure 5 This is a schematic diagram of the ore dressing process for pre-selection and discarding of waste in the tungsten ore reselection section in Example 1;

[0037] Figure 6 This is a schematic diagram of the process for conventional beneficiation of tungsten ore in the gravity separation section of comparative example 1. DETAILED DESCRIPTION

[0038] The present invention provides a method for pre-selecting and discarding waste from a tungsten ore reselection section, comprising the following steps:

[0039] The tungsten ore to be selected is subjected to double-layer sieving and grading to obtain first oversize, intermediate and first undersize respectively;

[0040] The first oversize material is subjected to first waste beneficiation to obtain first intermediate ore and first tailings, respectively, wherein the operating yield of the first waste beneficiation is greater than 50%, and the yield of the first tailings to the tungsten ore to be beneficiated is greater than 16%;

[0041] The intermediate is subjected to a first jigging beneficiation to obtain a first coarse concentrate and a second intermediate ore respectively;

[0042] The second intermediate ore is subjected to a second discarding and beneficiation to obtain a third intermediate ore and a second tailings, respectively, wherein the operating yield of the second discarding and beneficiation is greater than 50%, and the yield of the second tailings to the tungsten ore to be beneficiated is greater than 20%;

[0043] After combining the first intermediate ore and the third intermediate ore, dehydration, grinding and second jigging are sequentially performed to obtain a second coarse concentrate and a fourth intermediate ore;

[0044] Screening and grading the fourth intermediate ore to obtain a fourth intermediate ore oversize and a fourth intermediate ore undersize;

[0045] The fourth intermediate ore underscreen is subjected to first shaking table beneficiation to obtain a third coarse concentrate, a fifth intermediate ore and a third tailings respectively;

[0046] The first undersize material is subjected to a third jigging process to obtain a fourth coarse concentrate and a sixth intermediate ore respectively;

[0047] The sixth intermediate ore is subjected to second shaking table beneficiation to obtain a fifth rough concentrate, a seventh intermediate ore and a fourth tailings respectively;

[0048] The first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are gravity separation rough sand;

[0049] The WO3 grade of the re-selected rough sand is greater than 35%, and the WO3 recovery rate is greater than 86%.

[0050] Unless otherwise specified, the present invention has no special requirements on the sources of the raw materials used, and commercially available products known to those skilled in the art may be used.

[0051] The invention performs double-layer sieving and grading on the tungsten ore to be selected, and obtains first oversize material, intermediate material and first undersize material respectively.

[0052] As an implementation mode, the WO3 grade of the tungsten ore to be selected is 0.2-0.3%, and in specific embodiments, it is 0.21%, 0.22% or 0.23%; the particle size of the tungsten ore to be selected is less than 12 mm.

[0053] As an embodiment, the double-layer sieve includes a large-aperture sieve and a small-aperture sieve; the large-aperture sieve is a 6-10 mm sieve, and in a specific embodiment, it is a 6 mm sieve or an 8 mm sieve; the small-aperture sieve is a 1-2 mm sieve, and in a specific embodiment, it is a 1.6 mm sieve or a 2 mm sieve.

[0054] After obtaining the first oversize material, the present invention performs first waste beneficiation on the first oversize material to obtain a first intermediate ore and a first tailings, respectively. The operating yield of the first waste beneficiation is greater than 50%, and the yield of the first tailings to the tungsten ore to be selected is greater than 16%.

[0055] As an implementation mode, the equipment used for the first waste beneficiation is a continuous discharge jig; the continuous discharge jig is the continuous discharge jig in the patent document with application number 202422705544.X; the feeding method of the continuous discharge jig is through belt transportation or pipeline gravity flow, and the specific implementation is pipeline gravity flow.

[0056] Figures 1 to 4 It is a structural diagram of a continuous discharge jig, wherein 1-feed hopper, 2-heavy material discharge hopper 2, 3-heavy material discharge pipe, 4-light material discharge hopper, 5-light material discharge pipe, 6-guide plate, 7-support frame, 8-small particle discharge pipe, 9-screen plate, 10-heavy material plug valve, 11-light material plug valve. The continuous discharge jig is provided with a guide plate structure, which can smoothly guide the light material to move to the light material discharge end, reduce the resistance of the water flow and the light material due to the guided flow, and realize the smooth discharge of the light material; the guide plate will not reduce the width of the heavy material discharge end of the jig itself, and maximize the discharge efficiency of the jig, so that the heavy material under the guide plate can move smoothly to the heavy material discharge end, and the material is not easy to accumulate at the discharge port, and the jig has a high production efficiency.

[0057] As an implementation manner, the WO3 grade of the first intermediate ore is 0.2-0.25%; the WO3 grade of the first tailings is 0.02-0.03%, and in a specific embodiment, it is 0.025%.

[0058] In a specific embodiment, the operating yield of the first waste dressing process is 51.21%.

[0059] The present invention has no special limitation on the parameters of the first waste beneficiation. Under the condition that the operating yield of the first waste beneficiation is greater than 50% (the yield of the first tailings to the tungsten ore to be selected is greater than 16%), the first intermediate ore and the first tailings with the above-mentioned WO3 grade can be obtained.

[0060] After obtaining the intermediate, the present invention performs a first jigging beneficiation on the intermediate to obtain a first coarse concentrate and a second medium ore respectively.

[0061] As an embodiment, the WO3 grade of the first rough concentrate is 50-60%, and the WO3 grade of the second medium ore is 0.10-0.15%.

[0062] As an implementation mode, the equipment used for the first jigging ore dressing is a jig; the feeding mode of the jig is through belt transportation or pipeline gravity flow, and in the specific implementation, it is pipeline gravity flow. The present invention has no special limitation on the parameters of the first jigging ore dressing, and it is sufficient to obtain the first coarse concentrate and the second medium ore of the above-mentioned WO3 grade.

[0063] After obtaining the second intermediate ore, the present invention performs a second waste beneficiation on the second intermediate ore to obtain a third intermediate ore and a second tailings, respectively. The operating yield of the second waste beneficiation is greater than 50%, and the yield of the second tailings to the tungsten ore to be selected is greater than 20%.

[0064] As an implementation mode, the equipment used for the second waste beneficiation is the above-mentioned continuous discharge jig, which will not be described in detail here.

[0065] As an implementation manner, the WO3 grade of the third intermediate ore is 0.2-0.25%, and the WO3 grade of the second tailings is 0.02-0.03%, and in a specific embodiment, it is 0.028%.

[0066] In a specific embodiment, the operating yield of the second waste dressing process is 53.42%.

[0067] The present invention has no special limitation on the parameters of the second waste beneficiation. Under the condition that the operating yield of the second waste beneficiation is greater than 50% (the yield of the second tailings to the tungsten ore to be selected is greater than 20%), it is sufficient to obtain the third intermediate ore and the second tailings of the above-mentioned WO3 grade.

[0068] After obtaining the first intermediate ore and the third intermediate ore, the present invention combines the first intermediate ore and the third intermediate ore, and then sequentially performs dehydration, grinding and second jigging separation to obtain a second coarse concentrate and a fourth intermediate ore.

[0069] As an implementation mode, the dehydration equipment is a spiral classifier; the feeding method of the spiral classifier is gravity flow through a pipeline. The present invention has no special restrictions on the parameters in the dehydration process, as long as the material mass concentration in the grinding process can meet the requirements.

[0070] As an implementation mode, the equipment used for grinding is a rod mill; the feeding method of the rod mill is to pump the material through a sand pump.

[0071] As an embodiment, the grinding is rod milling, and the mass concentration of the material in the grinding process is 60-70%, and in a specific embodiment, it is 65-67%. The present invention has no special limitation on the parameters in the grinding process, and can be set according to the parameters known in the art.

[0072] As an embodiment, the WO3 grade of the second rough concentrate is 50-60%, and the WO3 grade of the fourth intermediate ore is 0.10-0.15%.

[0073] As an embodiment, the equipment used for the second jigging ore dressing is a jig. The present invention has no special limitation on the parameters of the second jigging ore dressing, and it is sufficient to obtain the second coarse concentrate and the fourth intermediate ore of the above WO3 grade.

[0074] After obtaining the fourth intermediate ore, the present invention screens and grades the fourth intermediate ore to obtain the fourth intermediate ore oversize and the fourth intermediate ore undersize.

[0075] As an implementation mode, the equipment used for screening and grading is a vibrating screen; the screen used for screening and grading is consistent with the small-aperture screen in the double-layer grading screen; the feeding method of the vibrating screen is to pump the material through a sand pump.

[0076] As an embodiment, the method further includes: returning the fourth intermediate ore screen material to be ground again.

[0077] After obtaining the fourth intermediate ore undersize, the present invention performs first shaking table beneficiation on the fourth intermediate ore undersize to obtain a third coarse concentrate, a fifth intermediate ore and a third tailings, respectively.

[0078] As an implementation mode, the WO3 grade of the third rough concentrate is 20-30%; the WO3 grade of the fifth intermediate ore is 0.10-0.15%; and the WO3 grade of the third tailings is 0.02-0.03%.

[0079] As an implementation mode, the equipment used for the first shaking table mineral processing is a shaking table; the feeding method of the shaking table is gravity flow through a pipeline. The present invention has no special limitation on the parameters of the first shaking table mineral processing, and it is sufficient to obtain the third coarse concentrate, the fifth intermediate ore and the third tailings of the above-mentioned WO3 grade.

[0080] As an embodiment, the method further includes: returning the fifth intermediate ore to be ground again.

[0081] After obtaining the first undersize material, the present invention performs a third jigging beneficiation on the first undersize material to obtain a fourth coarse concentrate and a sixth middling ore.

[0082] As an implementation mode, the WO3 grade of the fourth rough concentrate is 50-60%; the WO3 grade of the sixth intermediate ore is 0.10-0.15%.

[0083] As an implementation mode, the equipment used for the third jigging ore dressing is a jig. The present invention has no special limitation on the parameters of the third jigging ore dressing, and it only needs to achieve the fourth coarse concentrate and the sixth intermediate ore of the above WO3 grade.

[0084] After obtaining the sixth intermediate ore, the present invention performs second shaking table beneficiation on the sixth intermediate ore to obtain a fifth coarse concentrate, a seventh intermediate ore and a fourth tailings, respectively.

[0085] As an implementation mode, the WO3 grade of the fifth rough concentrate is 20-30%, the WO3 grade of the seventh intermediate ore is 0.10-0.15%, and the WO3 grade of the fourth tailings is 0.02-0.03%.

[0086] As an embodiment, the equipment used for the second shaking table beneficiation is a shaking table. The present invention has no special limitation on the parameters of the second shaking table beneficiation, and it is sufficient to obtain the fifth coarse concentrate, the seventh intermediate ore and the fourth tailings of the above WO3 grade.

[0087] As an embodiment, the method further includes: returning the seventh intermediate ore to be ground again.

[0088] As an embodiment, the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are gravity-selected rough sand.

[0089] As an embodiment, the WO3 grade of the re-selected rough sand is greater than 35%, and in specific embodiments, it is 35.92%, 36.16% or 38.13%, and the WO3 recovery rate is greater than 86%, and in specific embodiments, it is 86.36%, 86.45% or 88.36%.

[0090] As an implementation mode, the re-selected rough sand enters the concentration section for concentration. The present invention has no special limitation on the concentration process of the concentration section, and a process well known in the art can be used.

[0091] In the present invention, the operating yield of the first waste ore dressing and the second waste ore dressing is greater than 50% (the total yield of the first tailings and the second tailings to the tungsten ore to be selected is greater than 36%), and the WO3 grade in the first tailings and the second tailings is ≤0.03%, which is not greater than the WO3 grade in the third tailings and the fourth tailings. The present invention performs jigging + shaking table separation after discarding the first screen material and the second medium ore. The operating yield of the first and second discarding separations is greater than 50% (the total yield of the first and second discarding separations for the tungsten ore to be separated is greater than 36%). It has a certain effect on improving the WO3 grade of the obtained gravity separation rough sand and the recovery rate of WO3. The WO3 grade of the obtained gravity separation rough sand is greater than 35%, and the recovery rate of WO3 is greater than 86%. It is ensured that the WO3 grade and the recovery rate of the gravity separation rough sand are not lower than those before adding the pre-selection discarding operation, and the amount of ore to be ground and the amount of ore entering the subsequent shaking table operation can be effectively reduced, the grinding operation cost and the number of shaking table sets are reduced, and the enterprise can reduce cost and increase efficiency. The invention is suitable for the gravity separation of small tungsten mines.

[0092] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, but they should not be construed as limiting the protection scope of the present invention.

[0093] Example 1

[0094] like Figure 5 As shown in the figure, the tungsten ore to be selected with a WO3 grade of 0.21% and a particle size of <12 mm is fed into a double-layer vibrating screen for double-layer screening, and the screens used are a large-aperture screen (8 mm screen) and a small-aperture screen (2 mm screen), and three particle size products of the first oversize (particle size of -12+8 mm), the intermediate (particle size of -8+2 mm) and the first undersize (particle size of -2 mm) are obtained respectively;

[0095] The first oversize material (with a particle size of -12+8 mm) is fed into a continuous discharging jig through a belt conveyor for first waste beneficiation to obtain a first intermediate ore and a first tailing, respectively. The WO3 grade of the first tailing is 0.025%, and the operating yield of the first waste beneficiation is 51.21%;

[0096] The intermediate (with a particle size of -8+2 mm) is fed into a jig through a belt conveyor for first jig separation to obtain a first coarse concentrate and a second intermediate ore;

[0097] The second intermediate ore is fed to a continuous discharging jig through a pipeline by gravity flow for second waste beneficiation to obtain a third intermediate ore and a second tailings, respectively. The WO3 grade of the second tailings is 0.028%, and the operating yield of the second waste beneficiation is 53.42%;

[0098] The first intermediate ore and the third intermediate ore are combined and fed into a spiral classifier through a pipeline for dehydration, and then sent to a rod mill for grinding through a sand pump. The mass concentration of the material during the grinding process is 67%. The ground product is then fed into a jig through a pipeline for second jig separation to obtain a second coarse concentrate and a fourth intermediate ore respectively.

[0099] The fourth intermediate ore is pumped to a vibrating screen by a sand pump for screening and grading with a 2 mm sieve, the fourth intermediate ore screen material (+2 mm) is returned for grinding again, the fourth intermediate ore screen material (-2 mm) is fed to a shaking table by gravity through a pipeline for first shaking table beneficiation, and a third coarse concentrate, a fifth intermediate ore and a third tailings are respectively obtained, and the fifth intermediate ore is pumped back to the rod mill by a sand pump for grinding again;

[0100] The first undersize (with a particle size of -2 mm) is fed by gravity into the third jig beneficiation of the jig through a pipeline to obtain a fourth coarse concentrate and a sixth intermediate ore respectively;

[0101] The sixth intermediate ore is fed into a shaking table by gravity through a pipeline for second shaking table beneficiation to obtain a fifth rough concentrate, a seventh intermediate ore and a fourth tailings, respectively, and the seventh intermediate ore is pumped back to the rod mill by a sand pump for further grinding;

[0102] The first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as re-selected rough sand and enter the concentration stage for concentration, with a yield of 0.50%. After analysis and detection, the WO3 grade of the re-selected rough sand is 35.92%, and the recovery rate is 86.36%. The total yield of the first tailings + the second tailings for the tungsten ore to be selected is 37.28%, the WO3 grade is 0.026%, and the WO3 metal loss is 4.66%. The total yield of the third tailings + the fourth tailings for the tungsten ore to be selected is 62.23%, the WO3 grade is 0.03%, and the WO3 metal loss is 8.98%. The total yield of the first tailings + the second tailings + the third tailings + the fourth tailings for the tungsten ore to be selected is 99.50%, the WO3 grade is 0.0285%, and the WO3 metal loss is 13.64%.

[0103] Example 2

[0104] The difference from Example 1 is that the aperture of the large-pore screen used is changed to 6 mm. When the WO3 grade of the tungsten ore to be selected with a particle size of less than 12 mm is 0.22%, the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as the rough sand for gravity separation and enter the concentration stage for concentration. The yield is 0.47%. After analysis and detection, the WO3 grade of the rough sand for gravity separation is 38.13%, and the recovery rate is 86.45%. The first tailings + the second tailings are the tungsten ore to be selected. The total yield is 38.16%, the WO3 grade is 0.027%, and the WO3 metal loss is 4.97%. The total yield of the third tailings + the fourth tailings for the tungsten ore to be processed is 61.37%, the WO3 grade is 0.029%, and the WO3 metal loss is 8.58%. The total yield of the first tailings + the second tailings + the third tailings + the fourth tailings for the tungsten ore to be processed is 99.53%, the WO3 grade is 0.0282%, and the WO3 metal loss is 13.55%.

[0105] Example 3

[0106] The difference from Example 1 is that the aperture of the small-hole screen used is changed to 1.6 mm. When the WO3 grade of the tungsten ore to be selected with a particle size of less than 12 mm is 0.23%, the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as the rough sand for gravity separation and enter the concentration stage for concentration. The yield is 0.56%. After analysis and detection, the WO3 grade of the rough sand for gravity separation is 36.16%, and the recovery rate is 88.36%. The first tailings + the second tailings are the tungsten to be selected. The total yield of the mine is 39.07%, the WO3 grade is 0.025%, and the WO3 metal loss is 4.26%. The total yield of the third tailings + the fourth tailings for the tungsten ore to be processed is 60.37%, the WO3 grade is 0.028%, and the WO3 metal loss is 7.38%. The total yield of the first tailings + the second tailings + the third tailings + the fourth tailings for the tungsten ore to be processed is 99.44%, the WO3 grade is 0.0268%, and the WO3 metal loss is 11.64%.

[0107] Comparative Example 1

[0108] like Figure 6 As shown in the figure, the tungsten ore to be selected with a WO3 grade of 0.20% and a particle size of <12 mm is fed into a double-layer vibrating screen for double-layer screening, and the screens used are a large-aperture screen (8 mm screen) and a small-aperture screen (2 mm screen), and three particle size products of the first oversize (particle size of -12+8 mm), the intermediate (particle size of -8+2 mm) and the first undersize (particle size of -2 mm) are obtained respectively;

[0109] The intermediate (with a particle size of -8+2 mm) is fed into a jig for first jig separation to obtain a first coarse concentrate and a first intermediate ore;

[0110] The first intermediate ore and the first oversize (with a particle size of -12+8 mm) are combined and fed into a spiral classifier for dehydration, and then fed into a rod mill for grinding. The mass concentration of the materials during the grinding process is 66%. The ground products are then fed into a jig for second jig separation to obtain a second coarse concentrate and a second intermediate ore respectively.

[0111] The second intermediate ore is fed into a vibrating screen for screening and grading with a 2 mm sieve, the obtained oversize (+2 mm) is returned to the rod mill for grinding again, and the obtained undersize (-2 mm) is fed into a shaking table for first shaking table separation to obtain a third coarse concentrate, a third intermediate ore and a first tailings, respectively, and the third intermediate ore is returned to the rod mill for grinding again;

[0112] The first undersize (with a particle size of -2 mm) is fed into a jig for third jig separation to obtain a fourth coarse concentrate and a fourth intermediate ore;

[0113] The fourth intermediate ore is fed into a shaking table for second shaking table beneficiation to obtain a fifth rough concentrate, a fifth intermediate ore and a second tailings, respectively, and the fifth intermediate ore is returned to the rod mill for grinding again;

[0114] The first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as re-selected rough sand with a yield of 0.52%. After analysis and detection, the WO3 grade of the re-selected rough sand is 33.25%, and the recovery rate is 86.13%. The total yield of the first tailings + the second tailings for the tungsten ore to be selected is 99.48%, the WO3 grade is 0.029%, and the WO3 metal loss is 13.87%.

[0115] Comparative Example 2

[0116] The difference from Comparative Example 1 is that the aperture of the large-pore screen used is changed to 6 mm. When the WO3 grade of the tungsten ore to be selected with a particle size of less than 12 mm is 0.21%, the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as re-selection rough sand and enter the concentration section for selection, with a yield of 0.53%. After analysis and detection, the WO3 grade of the re-selection rough sand is 34.26%, and the recovery rate is 86.29%. The total yield of the first tailings + the second tailings for the tungsten ore to be selected is 99.47%, the WO3 grade is 0.025%, and the WO3 metal loss is 13.71%.

[0117] Comparative Example 3

[0118] The difference from Comparative Example 1 is that the aperture of the small-hole screen used is changed to 1.6 mm. When the WO3 grade of the tungsten ore to be selected with a particle size of less than 12 mm is 0.21%, the first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are combined as re-selection rough sand and enter the concentration section for selection, with a yield of 0.49%. After analysis and detection, the WO3 grade of the re-selection rough sand is 36.87%, and the recovery rate is 86.64%. The total yield of the first tailings + the second tailings for the tungsten ore to be selected is 99.51%, the WO3 grade is 0.028%, and the WO3 metal loss is 13.36%.

[0119] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention rather than all the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for pre-selecting and discarding waste from a heavy selection section of tungsten ore, characterized in that: The following steps are involved: The tungsten ore to be selected is subjected to double-layer sieving and grading to obtain first oversize, intermediate and first undersize respectively; The first oversize material is subjected to first waste beneficiation to obtain first intermediate ore and first tailings, respectively, wherein the operating yield of the first waste beneficiation is greater than 50%, and the yield of the first tailings to the tungsten ore to be beneficiated is greater than 16%; The intermediate is subjected to a first jigging beneficiation to obtain a first coarse concentrate and a second intermediate ore respectively; The second intermediate ore is subjected to a second discarding and beneficiation to obtain a third intermediate ore and a second tailings, respectively, wherein the operating yield of the second discarding and beneficiation is greater than 50%, and the yield of the second tailings to the tungsten ore to be beneficiated is greater than 20%; After combining the first intermediate ore and the third intermediate ore, dehydration, grinding and second jigging are sequentially performed to obtain a second coarse concentrate and a fourth intermediate ore; Screening and grading the fourth intermediate ore to obtain a fourth intermediate ore oversize and a fourth intermediate ore undersize; The fourth intermediate ore underscreen is subjected to first shaking table beneficiation to obtain a third coarse concentrate, a fifth intermediate ore and a third tailings respectively; The first undersize material is subjected to a third jigging process to obtain a fourth coarse concentrate and a sixth intermediate ore respectively; The sixth intermediate ore is subjected to second shaking table beneficiation to obtain a fifth rough concentrate, a seventh intermediate ore and a fourth tailings respectively; The first rough concentrate, the second rough concentrate, the third rough concentrate, the fourth rough concentrate and the fifth rough concentrate are gravity separation rough sand; The WO3 grade of the re-selected rough sand is greater than 35%, and the WO3 recovery rate is greater than 86%.

2. The ore dressing method according to claim 1, characterized in that: Also includes: The fourth intermediate ore oversize, the fifth intermediate ore and the seventh intermediate ore are returned to be ground again.

3. The ore dressing method according to claim 1, characterized in that: The double-layer sieve includes a large-aperture sieve and a small-aperture sieve; the large-aperture sieve is a 6-10 mm sieve; the small-aperture sieve is a 1-2 mm sieve.

4. The ore dressing method according to claim 1 or 3, characterized in that: The screen used for the screening and grading is consistent with the small-aperture screen in the double-layer screening grading.

5. The ore dressing method according to claim 1, characterized in that: The WO3 grade of the tungsten ore to be selected is 0.2-0.3%.

6. The ore dressing method according to claim 1 or 2, characterized in that: The grinding is rod grinding, and the mass concentration of the material in the grinding process is 60-70%.

7. The ore dressing method according to claim 1, characterized in that: The WO3 grade of the tungsten ore to be selected is 0.2-0.3%.

8. The ore dressing method according to claim 1, characterized in that: The WO3 grade of the first intermediate ore is 0.2-0.25%, and the WO3 grade of the first tailings is 0.02-0.03%; The WO3 grade of the third intermediate ore is 0.2-0.25%, and the WO3 grade of the second tailings is 0.02-0.03%.

9. The ore dressing method according to claim 1, characterized in that: The WO3 grade of the first rough concentrate is 50-60%, and the WO3 grade of the second medium ore is 0.10-0.15%; The WO3 grade of the second rough concentrate is 50-60%, and the WO3 grade of the fourth intermediate ore is 0.10-0.15%; The WO3 grade of the fourth coarse concentrate is 50-60%, and the WO3 grade of the sixth intermediate ore is 0.10-0.15%.

10. The ore dressing method according to claim 1, characterized in that: The WO3 grade of the third rough concentrate is 20-30%, the WO3 grade of the fifth intermediate ore is 0.10-0.15%, and the WO3 grade of the third tailings is 0.02-0.03%; The WO3 grade of the fifth coarse concentrate is 20-30%, the WO3 grade of the seventh intermediate ore is 0.10-0.15%, and the WO3 grade of the fourth tailings is 0.02-0.03%.

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