CN114682375A - Method for recovering lead from low-grade lead ore - Google Patents
Method for recovering lead from low-grade lead ore Download PDFInfo
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Abstract
The invention belongs to the technical field of mineral separation. The invention provides a method for recovering lead from low-grade lead ore, which comprises the following steps of performing coarse crushing, fine crushing and ball milling on raw ore in sequence to obtain a primary product; carrying out water conservancy grading on the primary product to obtain an overflow product; and (4) performing gravity reselection on the overflow product to complete lead recovery. The method provided by the invention has simple and reliable flow operation, can effectively recover valuable metal lead with high specific gravity for treating low-grade lead-containing lead ores, and can obtain high-grade lead concentrate with high recovery rate. Meanwhile, the sorting process flow provided by the invention does not need to add any sorting agent, the obtained tailings can be directly used for recycling other valuable metals or recycling secondary resources, the pollution problem of drug-containing tailings storage to the environment is reduced, the requirement of a green high-efficiency sorting process is met, and the enterprise benefit is improved.
Description
Technical Field
The invention relates to the technical field of ore dressing, in particular to a method for recovering lead from low-grade lead ore.
Background
Metallic lead plays a very important role in promoting the development of industry due to its unique physicochemical properties. Along with the large-scale development of high-quality lead ore resources in recent years, the rich ore resources are increasingly poor, so that the reasonable utilization of the low-grade lead ore resources has great industrial value. For low-grade lead ore resources, although the traditional flotation process can obtain an excellent sorting effect in the aspect of lead sorting, the large-scale application of the low-grade lead ore resources in the field of low-grade lead ore resources is limited by the problems of high cost caused by a complex reagent system, environmental pollution caused by subsequent tailing storage and the like. Therefore, the method for recovering lead in an efficient and environment-friendly manner has important industrial significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for recovering lead from low-grade lead ore.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for recovering lead from low-grade lead ore, which comprises the following steps:
(1) carrying out coarse crushing, fine crushing, screening and ball milling on raw ores in sequence to obtain a primary product;
(2) carrying out water conservancy grading on the primary product to obtain an overflow product;
(3) and (4) performing gravity reselection on the overflow product to complete lead recovery.
Preferably, the minerals of the raw ore in step (1) comprise quartz, mica and calcite;
the mass fraction of lead in the raw ore is 0.4-1.4%.
Preferably, the size of the coarse crushed ore discharge opening in the step (1) is 30-50 mm; the size of the finely-crushed ore discharge port is 8.5-9.5 mm;
the aperture of the screening is 7.8-8.2 mm.
Preferably, the concentration of the ore pulp subjected to ball milling in the step (1) is 60-70%, the filling rate is 30-40%, the rotating speed of the mill is 70-75%, and the time is 6-8 min.
Preferably, the cone angle of the hydraulic classification hydrocyclone in the step (2) is 25-35 degrees.
Preferably, the diameter of the hydrocyclone for hydraulic classification in the step (2) is 450-550 mm.
Preferably, in the step (2), the diameter of the water conservancy grading feed inlet is 0.23-0.28 of the diameter of the cyclone, the diameter of the overflow outlet is 0.29-0.31 of the diameter of the cyclone, and the diameter of the underflow outlet is 0.23-0.25 of the diameter of the cyclone.
Preferably, the concentration of the ore pulp reselected by gravity in the step (3) is 20-30%.
Preferably, the centrifugal gravity value of the gravity reselection in the step (3) is 40-60G.
Preferably, the backwash water pressure of the gravity reselection in the step (3) is 5-7 psi.
The invention provides a method for recovering lead from low-grade lead ore, which comprises the steps of performing coarse crushing, fine crushing and ball milling on raw ore in sequence to obtain a primary product; carrying out water conservancy grading on the primary product to obtain an overflow product; and (4) performing gravity reselection on the overflow product to complete lead recovery. The method provided by the invention is simple and reliable in process operation, can effectively recover valuable metal lead with high specific gravity for treating low-grade lead-containing lead ores, and can obtain high-grade and high-recovery lead concentrate, wherein the lead content in the concentrate is 11.93-14.18%, and the concentrate yield is 3.21-9.64%; the lead content in the tailings is 0.02-0.04%, and the tailing yield is 90.36-96.79%; the total recovery rate of lead in the final concentrate is 95.74-97.64%. Meanwhile, the sorting process flow provided by the invention does not need to add any sorting agent, the obtained tailings can be directly used for recycling other valuable metals or reusing secondary resources, the pollution problem of drug-containing tailings storage to the environment is reduced, the requirement of a green high-efficiency sorting process is met, and the enterprise benefit is improved.
Drawings
FIG. 1 is a flow chart of lead ore recovery in example 1.
Detailed Description
The invention provides a method for recovering lead from low-grade lead ore, which comprises the following steps:
(1) carrying out coarse crushing, fine crushing, screening and ball milling on raw ores in sequence to obtain a primary product;
(2) carrying out water conservancy grading on the primary product to obtain an overflow product;
(3) and (4) performing gravity reselection on the overflow product to complete lead recovery.
In the present invention, the minerals of the raw ore in step (1) preferably comprise quartz, mica and calcite.
In the invention, the mass fraction of the minerals in the raw ore is preferably 90.63-94.32%, more preferably 91-94%, and even more preferably 92-93%.
In the invention, the mass fraction of lead in the raw ore is preferably 0.4-1.4%, more preferably 0.6-1.2%, and even more preferably 0.8-1.0%.
In the invention, the size of the coarsely crushed ore discharge opening in the step (1) is preferably 30-50 mm, more preferably 35-45 mm, and more preferably 38-42 mm; the size of the finely-crushed ore discharge opening is preferably 8.5-9.5 mm, further preferably 8.6-9.4 mm, and more preferably 8.8-9.2 mm.
In the invention, the aperture of the screening is preferably 7.8-8.2 mm, more preferably 7.85-8.15 mm, and even more preferably 7.95-8.05 mm.
In the invention, the materials which cannot be sieved return to the fine crushing flow for reprocessing.
In the invention, the concentration of the ore pulp subjected to ball milling in the step (1) is preferably 60-70%, more preferably 62-68%, and even more preferably 64-66%; the filling rate is preferably 30-40%, more preferably 32-38%, and more preferably 34-36%; the rotation speed rate of the mill is preferably 70-75%, more preferably 71-74%, and more preferably 72-73%; the time is preferably 6-8 min, more preferably 6.5-7.5 min, and even more preferably 7 min; the diameter of the grinding ball is preferably 20-30 mm, more preferably 22-28 mm, and even more preferably 24-26 mm.
In the present invention, the particle size of the primary product after ball milling is preferably equal to or less than 0.074mm, more preferably equal to or less than 0.072mm, and still more preferably equal to or less than 0.070 mm.
In the invention, the cone angle of the hydraulic classification hydrocyclone in the step (2) is preferably 25-35 degrees, more preferably 26-34 degrees, and even more preferably 28-32 degrees.
In the invention, the diameter of the hydrocyclone of the hydraulic classification in the step (2) is preferably 450-550 mm, more preferably 460-540 mm, and even more preferably 480-520 mm.
In the invention, the diameter of the water conservancy grading feed inlet in the step (2) is 0.23-0.28 of the diameter of the cyclone, more preferably 0.24-0.27, and more preferably 0.25-0.26; the diameter of the overflow port is preferably 0.29-0.31 of the diameter of the cyclone, more preferably 0.295-0.305, and even more preferably 0.298-0.302; the diameter of the underflow port is preferably 0.23 to 0.25, more preferably 0.235 to 0.245, and even more preferably 0.238 to 0.242 of the diameter of the cyclone.
In the invention, overflow products and settled sand products are obtained through water conservancy grading, and the grain diameter of the overflow products is preferably less than or equal to 0.208mm, more preferably less than or equal to 0.206mm, and even more preferably less than or equal to 0.204 mm; returning the settled sand product to the ball milling process for ball milling.
In the present invention, the gravity reselection in the step (3) is a nielsen reselection.
In the invention, the concentration of the ore pulp reselected by gravity in the step (3) is preferably 20-30%, more preferably 22-28%, and even more preferably 24-26%.
In the invention, the centrifugal gravity value of the gravity reselection in the step (3) is preferably 40-60G, more preferably 45-55G, and even more preferably 46-54G.
In the invention, the backwash water pressure for gravity reselection in the step (3) is preferably 5-7 psi, more preferably 5.5-6.5 psi, and even more preferably 5.8-6.2 psi.
In the invention, after gravity reselection operation, the obtained concentrate product can be subjected to re-concentration treatment after being stored, and tailings can be used for recycling other valuable metals or recycling secondary resources.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
In this example, the mass fraction of the minerals in the raw ore is 90.63%, and the mass fraction of the metallic lead is 0.4%.
Roughly crushing raw ore in a jaw crusher (model: FTEP-100 x 125), wherein the size of a roughly crushed ore discharge opening is 40mm, and finely crushing the raw ore in a double-roller crusher (model: XPZ-200 x 150) after the rough crushing is finished, wherein the size of a finely crushed ore discharge opening is 9 mm; screening and checking the product obtained by fine crushing, wherein the aperture of a vibrating screen (the model is ZYC-200) is 8mm, the yield of the product with the particle size of more than 8mm is 18.14%, and returning to the fine crushing process; the yield of the product with the particle size of less than 8mm is 81.86 percent, and the product is subjected to the next step of ball milling. The diameter of a grinding ball in the ball mill (type XMQ-360 multiplied by 160) is 25mm, the concentration of ore pulp subjected to ball milling is 65%, the filling rate is 35%, the rotating speed rate of the mill is 70%, and the time is 7 mm; and (3) obtaining a primary product after the ball milling is finished, wherein the particle size of the primary product is less than 0.074mm, the yield is 29.72%, and carrying out the next step of hydraulic classification.
Carrying out grading operation on the obtained primary product by utilizing a hydraulic cyclone (the model is FX-500), wherein the cone angle of the cyclone is 25 degrees, the diameter of the cyclone is 500mm, the diameter of a feed inlet is 125mm, the diameter of an overflow port is 150mm, and the diameter of a bottom flow port is 120 mm; obtaining an overflow product and a sand setting product after water conservancy grading, wherein the particle size of the sand setting product is more than 0.208mm, the yield is 22.57%, and returning to the ball milling operation for regrinding; the grain diameter of the overflow product is less than or equal to 0.208mm, the yield is 77.43 percent, and the overflow product enters a Nielsen beneficiation agent for gravity reselection.
And (3) reselecting the overflow product in a Nielsen concentrator (model is MD-3), wherein the concentration of ore pulp is 25%, the centrifugal gravity value is 40G, and the pressure of recoil water is 5.0 psi.
After the Nielsen gravity reselection, the lead content in the concentrate is 11.93%, and the yield of the concentrate is 3.21%; the lead content in the tailings is 0.02 percent, and the yield of the tailings is 96.79 percent; the overall recovery of lead in the final concentrate was 95.74%.
The flow chart of lead ore recovery in this example is shown in fig. 1.
Example 2
In this example, the mass fraction of the minerals in the raw ore was 91.55%, and the mass fraction of metallic lead was 0.7%.
Carrying out coarse crushing on raw ore in a jaw crusher, wherein the size of a coarse crushing ore discharge opening is 30mm, and carrying out fine crushing in a roller crusher after the coarse crushing is finished, wherein the size of a fine crushing ore discharge opening is 9 mm; screening and checking the product obtained by fine crushing, wherein the aperture of a vibrating screen is 8mm, the yield of the product with the particle size larger than 8mm is 21.13%, and returning to the fine crushing process; the yield of the product with the particle size of less than 8mm is 78.87 percent, and the product is subjected to the next step of ball milling. The diameter of a grinding ball in the ball mill is 30mm, the concentration of ore pulp subjected to ball milling is 60%, the filling rate is 33%, the rotating speed rate of the ball mill is 71%, and the time is 6 mm; and (3) obtaining a primary product after the ball milling is finished, wherein the particle size of the primary product is less than 0.072mm, the yield is 31.91%, and carrying out the next step of water conservancy classification.
Carrying out grading operation on the obtained primary product by using a hydraulic cyclone, wherein the cone angle of the cyclone is 30 degrees, the diameter of the cyclone is 500mm, the diameter of a feeding opening is 115mm, the diameter of an overflow opening is 145mm, and the diameter of a bottom flow opening is 125 mm; obtaining an overflow product and a settled sand product after water conservancy classification, wherein the particle size of the settled sand product is more than 0.207mm, the yield is 15.91 percent, and returning to the ball milling operation for regrinding; the grain diameter of the overflow product is less than or equal to 0.207mm, the yield is 84.09%, and the overflow product enters a Nielsen beneficiation agent for gravity separation.
And (3) reselecting the overflow product in a Nielsen concentrator, wherein the concentration of ore pulp is 20%, the centrifugal gravity value is 45G, and the pressure of the back-flushing water is 5.5 psi.
After the Nielsen gravity reselection, the lead content in the concentrate is 12.11 percent, and the yield of the concentrate is 5.58 percent; the lead content in the tailings is 0.03 percent, and the tailing yield is 94.42 percent; the overall recovery of lead in the final concentrate was 96.53%.
Example 3
In this example, the mass fraction of the minerals in the raw ore is 92.47%, and the mass fraction of the metallic lead is 1.00%.
Carrying out coarse crushing on raw ore in a jaw crusher, wherein the size of a coarse crushing ore discharge opening is 45mm, and carrying out fine crushing in a roller crusher after the coarse crushing is finished, wherein the size of a fine crushing ore discharge opening is 8.5 mm; screening and checking the product obtained by fine crushing, wherein the aperture of a vibrating screen is 7.8mm, the yield of the product with the particle size of more than 7.8mm is 19.69%, and returning to the fine crushing process; the yield of the product with the particle size of less than 7.8mm is 80.31 percent, and the next step of ball milling is carried out. The diameter of a grinding ball in the ball mill is 20mm, the concentration of ore pulp subjected to ball milling is 65%, the filling rate is 38%, the rotating speed rate of the ball mill is 74%, and the time is 8 mm; and (3) obtaining a primary product after ball milling, wherein the particle size of the primary product is less than 0.074mm, the yield is 34.08%, and carrying out the next step of hydraulic classification.
Carrying out grading operation on the obtained primary product by using a hydrocyclone, wherein the cone angle of the hydrocyclone is 33 degrees, the diameter of the hydrocyclone is 550mm, the diameter of a feeding opening is 154mm, the diameter of an overflow opening is 165mm, and the diameter of a bottom flow opening is 132 mm; obtaining an overflow product and a settled sand product after water conservancy grading, wherein the particle size of the settled sand product is more than 0.206mm, the yield is 13.68%, and returning to the ball milling operation for regrinding; the grain diameter of the overflow product is less than or equal to 0.206mm, the yield is 86.32%, and the overflow product enters a Nielsen beneficiation agent for gravity separation.
And (3) reselecting the overflow product in a Nielsen concentrator, wherein the concentration of ore pulp is 25%, the centrifugal gravity value is 50G, and the pressure of recoil water is 6.0 psi.
After the Nielsen gravity reselection, the lead content in the concentrate is 13.48 percent, and the yield of the concentrate is 7.19 percent; the lead content in the tailings is 0.03 percent, and the tailing yield is 92.81 percent; the overall recovery of lead in the final concentrate was 96.92%.
Example 4
In this example, the mass fraction of minerals in the raw ore is 92.47%, and the mass fraction of metallic lead is 1.20%.
Carrying out coarse crushing on raw ore in a jaw crusher, wherein the size of a coarse crushing ore discharge opening is 35mm, and carrying out fine crushing in a roller crusher after the coarse crushing is finished, wherein the size of a fine crushing ore discharge opening is 9.5 mm; screening and checking the product obtained by fine crushing, wherein the aperture of a vibrating screen is 8mm, the yield of the product with the particle size larger than 8mm is 17.54%, and returning to the fine crushing process; the yield of the product with the particle size of less than 8mm is 82.46 percent, and the product is subjected to the next step of ball milling. The diameter of a grinding ball in the ball mill is 30mm, the concentration of ore pulp subjected to ball milling is 70%, the filling rate is 34%, the rotating speed rate of the ball mill is 73%, and the time is 7 mm; and (3) obtaining a primary product after ball milling, wherein the particle size of the primary product is less than 0.074mm, the yield is 36.27%, and carrying out the next step of hydraulic classification.
Carrying out grading operation on the obtained primary product by using a hydraulic cyclone, wherein the cone angle of the cyclone is 28 degrees, the diameter of the cyclone is 450mm, the diameter of a feeding opening is 117mm, the diameter of an overflow opening is 135mm, and the diameter of a bottom flow opening is 108 mm; obtaining an overflow product and a settled sand product after water conservancy grading, wherein the particle size of the settled sand product is more than 0.208mm, the yield is 11.46 percent, and returning to the ball milling operation for regrinding; the grain diameter of the overflow product is less than or equal to 0.208mm, the yield is 88.54 percent, and the overflow product enters a Nielsen beneficiation agent for gravity reselection.
And (3) reselecting the overflow product in a Nielsen concentrator, wherein the concentration of the ore pulp is 30%, the centrifugal gravity value is 55G, and the pressure of the back-flushing water is 6.5 psi.
After the Nielsen gravity reselection, the lead content in the concentrate is 13.71 percent, and the yield of the concentrate is 8.50 percent; the lead content in the tailings is 0.04%, and the tailing yield is 91.50%; the overall recovery of lead in the final concentrate was 97.11%.
Example 5
In this example, the mass fraction of the minerals in the raw ore was 92.47%, and the mass fraction of metallic lead was 1.40%.
Carrying out coarse crushing on raw ore in a jaw crusher, wherein the size of a coarse crushing ore discharge opening is 45mm, and carrying out fine crushing in a roller crusher after the coarse crushing is finished, wherein the size of a fine crushing ore discharge opening is 9.3 mm; screening and checking the product obtained by fine crushing, wherein the aperture of a vibrating screen is 8.2mm, the yield of the product with the particle size of more than 8.2mm is 22.57%, and returning to the fine crushing process; the yield of the product with the particle size of less than 8.2mm is 77.43 percent, and the next step of ball milling is carried out. The diameter of a grinding ball in the ball mill is 25mm, the concentration of ore pulp subjected to ball milling is 65%, the filling rate is 38%, the rotating speed rate of the ball mill is 75%, and the time is 7 mm; and (3) obtaining a primary product after the ball milling is finished, wherein the particle size of the primary product is less than 0.074mm, the yield is 38.46%, and carrying out the next step of hydraulic classification.
Carrying out grading operation on the obtained primary product by using a hydrocyclone, wherein the cone angle of the hydrocyclone is 33 degrees, the diameter of the hydrocyclone is 500mm, the diameter of a feeding opening is 130mm, the diameter of an overflow opening is 155mm, and the diameter of a bottom flow opening is 115 mm; obtaining an overflow product and a settled sand product after water conservancy grading, wherein the particle size of the settled sand product is more than 0.208mm, the yield is 9.23%, and returning to the ball milling operation for regrinding; the grain diameter of the overflow product is less than or equal to 0.208mm, the yield is 90.77%, and the overflow product enters a Nielsen beneficiation agent for gravity reselection.
And (3) reselecting the overflow product in a Nielsen concentrator, wherein the concentration of ore pulp is 30%, the centrifugal gravity value is 60G, and the pressure of the back-flushing water is 7.0 psi.
After the Nielsen gravity reselection, the lead content in the concentrate is 14.18 percent, and the yield of the concentrate is 9.64 percent; the lead content in the tailings is 0.04%, and the tailing yield is 90.36%; the overall recovery of lead in the final concentrate was 97.64%.
According to the embodiment, the invention provides the method for recovering lead from the low-grade lead ore, which comprises the steps of performing coarse crushing, fine crushing and ball milling on raw ore in sequence to obtain a primary product; carrying out water conservancy grading on the primary product to obtain an overflow product; and (4) performing gravity reselection on the overflow product to complete lead recovery. The method provided by the invention is simple and reliable in process operation, can effectively recover valuable metal lead with high specific gravity for treating low-grade lead-containing lead ores, and can obtain high-grade and high-recovery lead concentrate, wherein the lead content in the concentrate is 11.93-14.18%, and the concentrate yield is 3.21-9.64%; the lead content in the tailings is 0.02-0.04%, and the tailing yield is 90.36-96.79%; the total recovery rate of lead in the final concentrate is 95.74-97.64%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The method for recovering lead from low-grade lead ore is characterized by comprising the following steps of:
(1) carrying out coarse crushing, fine crushing, screening and ball milling on raw ores in sequence to obtain a primary product;
(2) carrying out water conservancy grading on the primary product to obtain an overflow product;
(3) and (4) performing gravity reselection on the overflow product to complete lead recovery.
2. The method according to claim 1, wherein the minerals of the raw ore in step (1) comprise quartz, mica and calcite;
the mass fraction of lead in the raw ore is 0.4-1.4%.
3. The method according to claim 1 or 2, wherein the size of the coarsely crushed ore discharge port in step (1) is 30 to 50 mm; the size of the finely-crushed ore discharge port is 8.5-9.5 mm;
the aperture of the screening is 7.8-8.2 mm.
4. The method according to claim 3, wherein the concentration of the slurry in the ball milling in the step (1) is 60-70%, the filling rate is 30-40%, the rotation rate of the mill is 70-75%, and the time is 6-8 min.
5. The method of claim 1 or 4, wherein the hydro-graded hydrocyclone in step (2) has a cone angle of 25-35 °.
6. The method of claim 5, wherein the hydraulically classified cyclone in step (2) has a diameter of 450 to 550 mm.
7. The method of claim 6, wherein the hydraulic classification in step (2) has a feed port diameter of 0.23 to 0.28, a spill port diameter of 0.29 to 0.31, and a underflow port diameter of 0.23 to 0.25.
8. The method according to claim 1 or 7, characterized in that the concentration of the slurry reselected by gravity in the step (3) is 20-30%.
9. The method of claim 8, wherein the gravity reselection in step (3) has a centrifugal gravity value of 40-60G.
10. The method of claim 9, wherein the backwash water pressure for the gravity reselection in step (3) is 5-7 psi.
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| DE3109448A1 (en) * | 1981-03-12 | 1982-11-04 | Klöckner-Humboldt-Deutz AG, 5000 Köln | METHOD AND SYSTEM FOR OBTAINING PLASTIC-FREE LEAD PRODUCTS FROM OLD ACCUMULATORS |
| JP2006035102A (en) * | 2004-07-27 | 2006-02-09 | Mitsui Mining & Smelting Co Ltd | Specific gravity sorting machine and specific gravity sorting method |
| CN102527498A (en) * | 2011-12-31 | 2012-07-04 | 元阳县华西黄金有限公司 | Non-cyanide ore dressing method for gold-copper-lead sulfide ore |
| CN104148163A (en) * | 2014-07-29 | 2014-11-19 | 广西金山铟锗冶金化工有限公司 | Beneficiation method for processing low grade tin-lead-zinc multi-metal oxidized ores |
| CN113304875A (en) * | 2021-05-07 | 2021-08-27 | 广东省科学院资源利用与稀土开发研究所 | Dolomite-barite lead-zinc ore full-recycling method |
| CN113731625A (en) * | 2021-08-19 | 2021-12-03 | 河南金源黄金矿业有限责任公司 | Low-grade ore dressing process |
-
2022
- 2022-04-12 CN CN202210379261.3A patent/CN114682375A/en active Pending
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| DE3109448A1 (en) * | 1981-03-12 | 1982-11-04 | Klöckner-Humboldt-Deutz AG, 5000 Köln | METHOD AND SYSTEM FOR OBTAINING PLASTIC-FREE LEAD PRODUCTS FROM OLD ACCUMULATORS |
| JP2006035102A (en) * | 2004-07-27 | 2006-02-09 | Mitsui Mining & Smelting Co Ltd | Specific gravity sorting machine and specific gravity sorting method |
| CN102527498A (en) * | 2011-12-31 | 2012-07-04 | 元阳县华西黄金有限公司 | Non-cyanide ore dressing method for gold-copper-lead sulfide ore |
| CN104148163A (en) * | 2014-07-29 | 2014-11-19 | 广西金山铟锗冶金化工有限公司 | Beneficiation method for processing low grade tin-lead-zinc multi-metal oxidized ores |
| CN113304875A (en) * | 2021-05-07 | 2021-08-27 | 广东省科学院资源利用与稀土开发研究所 | Dolomite-barite lead-zinc ore full-recycling method |
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