AU2020336795A1 - Pyrrhotite mineral processing method using low-alkali process of flotation followed by magnetic separation - Google Patents
Pyrrhotite mineral processing method using low-alkali process of flotation followed by magnetic separation Download PDFInfo
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- AU2020336795A1 AU2020336795A1 AU2020336795A AU2020336795A AU2020336795A1 AU 2020336795 A1 AU2020336795 A1 AU 2020336795A1 AU 2020336795 A AU2020336795 A AU 2020336795A AU 2020336795 A AU2020336795 A AU 2020336795A AU 2020336795 A1 AU2020336795 A1 AU 2020336795A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/087—Subsequent treatment of concentrated product of the sediment, e.g. regrinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A pyrrhotite mineral processing method using a low-alkali process of flotation followed by magnetic separation, comprising the following steps: performing a coarse copper particle flotation process on pyrrhotite ores; performing a secondary fine copper particle flotation process on the obtained copper flotation concentrate; performing a copper flotation scavenging process on tailings obtained from the coarse copper particle flotation process; performing a coarse sulfur particle flotation process on tailings obtained from the copper flotation scavenging process; performing a sulfur flotation scavenging process on tailings obtained from the coarse sulfur particle flotation process; and performing a magnetic separation process on tailings obtained from the sulfur flotation scavenging process, so as to obtain iron ore concentrate. The method applies in particular to pyrrhotite having low copper content and high ferrous sulfide content, and uses a low-alkali process of flotation followed by magnetic separation; valuable metals such as copper, iron, sulfur and pyrrhotite in copper-iron ores can be fully recovered.
Description
Low-alkali flotation-followed-magnetic beneficiation method for ores containing pyrrhotite
FIELD OF THE INVENTION s The invention relates to chemical industry and metallurgy, in particular relates to beneficiation processes of ores mixed with chalcopyrite, pyrite, magnetite and pyrrhotite.
BACKGROUND OF THE INVENTION 1o As an important mineral deposit in Tongling Mineral Concentrated Area which locates in metallogenic belt of the middle and lower reaches of the Yangtze River in China, Xinqiao copper-sulfur-iron mineral deposit, rich in sulfur reserves, mainly contains chalcopyrite, pyrite, magnetite, pyrrhotite and a small amount of galena and sphalerite. In China, there are numerous mines with similar mineral deposits, typically such as Dongguashan Copper Mine in Tongling, Anqing Copper Mine in Anhui, Zijin Mine in Tongling, etc. Xinqiao Mine boasts a mining and beneficiation capacity of 1.5 million tons per year, including 600,000 tons of underground minerals and 900,000 tons of surface minerals. It has become a large polymetallic mine with an annual output of 1.4 million tons of sulfur concentrate, 40,000 tons of copper concentrate and 100,000 tons of iron ore. After years of production, the process flow has become smooth with high quality standard. However, there are still some problems: firstly, due to the influence of market, low-sulfur concentrate with about 40% sulfur is difficult to sell even at low price; secondly, the sulfur in iron concentrate exceeds the standard seriously, the sulfur in the iron concentrate from this mime is generally more than 3-4%, sometimes even more than 10%; besides, the iron recovery rate is low. At present, there are limited literature reported on the beneficiation process of copper-sulfur-iron ores containing pyrrhotite, and the single beneficiation process or process combined with magnetic s separation are mainly used. Zhao Guanfei and others tried to recover the high-sulfur copper-iron ores in Anhui and other places, but the iron concentrate, with high sulfur content, is difficult to be used efficiently.
SUMMARY OF THE INVENTION 1. Technical problem to be resolved The invention is provided to improve the separation efficiency of valuable metals such as copper, sulfur, and iron from gangue such as quartz, garnet and the like in the copper-sulfur-iron ores. 1s 2. Technical solution In order to achieve the said purpose of the invention, a technical solution is provided by the present invention as follows: carrying out a copper flotation roughing process to the pyrrhotite-containing ore, wherein the used collectors are: 0-(2-methylpropyl) N-ethylcarbamothioate Z-200, the dosage being 20 to 23g/t, and Sodium Ethyl Xanthate B03, the dosage being 42 to 48 g/t; the frother is No. two oil, the dosge being 20 to 22g/t; carrying out two copper flotation concentrating processes on the obtained copper flotation concentrate; carrying out a copper flotation scavenging process to the tailings obtained from the copper flotation roughing process, wherein the used collectors are: 0-(2-methylpropyl) N-ethylcarbamothioate Z-200, the dosage being 5 to 9g/t, and Sodium Ethyl Xanthate B03, the dosage being 10 to 20g/t; the frother is No. two oil, the dosgae being 6 to 8 g/t;carrying out sulfur flotation roughing process to the tailings obtained from the said copper flotation scavenging process, wherein there are used 5500-6500g/t of sulfuric acid, 95-105 g/t of Sodium Ethyl Xanthate, 20-22g/t of the No. two oil and 12-13 minutes of s flotation time; carrying out a sulfur flotation scavenging process to the tailings obtained from the said sulfur flotation roughing process, wherein there are used 1800-2000g/t of sulfuric acid, 30-40g/t of Sodium Ethyl Xanthate, 6-8g/t of No. two oil and 4-5 minutes of flotation time; carrying out a magnetic separation process to the 1o tailings obtained from the said sulfur flotation scavenging process to gain iron concentrate. Preferably, the frother used in the said copper flotation roughing process for pyrrhotite-containing ore is No. two oil, the dosage being 21 g/t. 1s Preferably, the two copper flotation concentration processes are divided into a first copper flotation concentration process and a second copper flotation concentration process; the said second copper flotation concentration process also produces first middlings, and the first middlings is returned to the first copper flotation concentration process. Preferably, the first copper flotation concentration process also produces the second middlings, and the said second middlings are returned to the copper flotation roughing process. Preferably, the third middlings obtained from the said copper flotation scavenging process are returned to the said copper flotation roughing process. Preferably, the fourth middlings from the said sulfur flotation scavenging process are returned to the said sulfur flotation roughing process.
Preferably, the copper concentrate is obtained after the two copper flotation concentration processes. Preferably, the sulfur concentrate is obtained after the said sulfur flotation roughing process. s 3. Beneficial effect (1) Equipments with combined action of various kinds of force fields adopted in the present invention, such as a flotation machine and a magnetic separator, are an important supporting point for realizing the method, and the new benefication equipment brings good effect. 1o (2) During the separation, the present invention adopts a novel process flow, which shortens the bebefication process and reduces production cost; the novel process flow is another important supporting point for realizing the invention. (3) During the separation, the present invention adopts a low-alkali method, thereby reducing the consumption of lime during the generation, improving the subsequent dehydration process, reducing the production cost and increasing the economic benefit. (4) Compared with the prior art, the method features in comprehensively recycling the valuable metals in the copper-iron ores, including metal substances such as copper, iron, sulfur, pyrrhotite and the like, thereby bringing good economic benefit.
Figure 1 is a process flow diagram of the beneficiation for pyrrhotite-containing ore of the present invention.
In order to help better understand the technical contents of the present invention, the present invention is further described in detail s with reference to the accompanying drawings in combination with the embodiments The fig. 1 is a process flow diagram of the beneficiation for pyrrhotite-containing ore of the present invention. As is shown in fig. 1, the method comprises the following steps: S1. Performing a copper flotation roughing process on the pyrrhotite-containing ore, and performing two copper flotation concentrating processes on the obtained copper flotation concentrate. In practice, the raw iron ore may be crushed and ground. For example, the raw material is crushed into copper-sulfur-iron ore of 1s size -2mm and then ground by a ball mill; lime reagent is added before grinding, as to keep PH value at 9 ±0.5 eventually; particle size of the product should be controlled by overflow, so that the product with particle size of -0.074mm accounts for 75% of all products. Overflow product is processed by the first copper flotation roughing process which may use suitable collectors and frothers. The preferred collector is Z-200 (the molecular formula is (CH3)2CHOCSNHC2H5)+ B03 (B03 is Sodium Ethyl Xanthate, and the unit G/t is gram per ton), and the dosage is (15-25) + (40-60) g/t; the preferred frother is No. two oil (compound higher alcohol), and the dosage is 15-25g/t. The roughing time could be controlled between 5 to 10 minutes, for example, 7 minutes. Copper flotation roughing concentrate and copper flotation roughing tailings are obtained after the copper flotation roughing process; the first copper flotation concentration is carried out on the copper flotation roughing concentrate by keeping the pH value between 11-12 and the concentration time between 5-15 minutes, for example, 10 minutes, to produce a copper flotation concentrating concentrate s and second middlings. The second copper flotation concentration could be performed on the obtained copper flotation concentrating concentrate. Similarly, by keeping the pH value between 11-12 and the concentration time around 10 minutes, the copper concentrate and first middlings are obtained. The second middlings obtained from the first copper flotation concentrating process is returned to the copper flotation roughing process for copper flotation roughing again; the first middlings obtained from the second copper flotation concentrating process are is returned to the first copper flotation concentrating process for copper flotation concentration again, and a copper flotation scavenging process will be performed on the copper flotation roughing tailings produced by the said copper flotation roughing process .
S2. Performing the copper flotation scavenging process on the tailings obtained from the said copper flotation roughing process. The said copper flotation scavenging process in this step also uses suitable collectors and frothers. The prefer collector in the invention is Z-200 + B03, and the dosage is (5-10) + (20-30) g/t; the frother is No. two oil, and the dosage is 5-1Og/t. S3. Performing a sulfur flotation roughing process on the tailings obtained from the said copper flotation scavenging process. In this step, sulfur flotation roughing is performed. The reagents used are preferably sulfuric acid of 5000-7000g/t, Sodium Ethyl Xanthate of 60-120g/tand No. two oil of 15-25 g/t, and the flotation time is generally 10-15 minutes, preferably 13 minutes; and then the products, namely sulfur concentrate of sulfur flotation roughing and sulfur flotation roughing tailings, are obtained. S4. Performing a sulfur flotation scavenging process on the tailings s obtained by the said sulfur flotation roughing process. Performing one sulfur flotation scavenging process on the said sulfur flotation roughing tailings, preferably, in the sulfur flotation scavenging process, there are used sulfuric acid of 1000-2000g/t, Sodium Ethyl Xanthate of 30-50g/t and No. two oil of 5-10g/t, and about 5 minutes 1o of flotation time. A foam product, namely fourth middlings, and sulfur flotation scavenging tailings are obtained by the said flotation scavenging process, and the foam product, namely the fourth middlings are returned to the said sulfur flotation roughing process for flotation again. S5. Performing a magnetic separation on the tailings obtained from the said sulfur flotation scavenging process to obtain iron concentrate. Performing a magnetic separation roughing process on the tailings obtained from the said sulfur flotation scavenging process, and the magnetic separation roughing process should adopt appropriate magnetic separation parameters, for example, the magnetic field strength is set to be 111.4 KA/M; and the products obtained from the magnetic separation concentrate are iron concentrate and tailings.
The present invention is further illustrated below by a specific embodiment. In this embodiment, the raw materials are copper-sulfur-iron ores from a mime in Anhui, containing 0.365% of Cu, 34.32% of S and 40.15% of Fe, and the mineral composition of the ores is complex; the metal minerals of the said ores include chalcopyrite, magnetite, hematite, pyrrhotite, pyrite, galena and s siderite. And the non-metallic minerals are mainly carbonate minerals. The ores are mainly featured by massive structure and disseminated structure. The distribution of minerals is complex; the magnetite is divided into many particles by calcite as the cracks of the magnetite develop, wherein the nested and distributed particles are mainly fine particles. Copper minerals are rare and relatively dispersed. Pyrite is featured by the structures of porphyroblast and inequigranular crystal, and the nested and distributed grain size is extremely inequigranular nested-distribution. The main reason is that the pyrite with fine nested and distributed grain size, is pierced and 1s cut by calcite network veins, which makes it more difficult to dissociate monomer. The process flow as shown in Fig.1 is adopted, and the specific process parameters are as follows: (1) After crushing the raw materials into copper-sulfur-iron ore of -2mm, grinding the ore in a ball mill (the particle size of the product is controlled by overflow, so that the particle size of -0.074mm accounts for 75%); adding lime reagent before grinding as to keep the pH value at 9 ±0.5 eventually. (2) Firstly performing the first copper flotation roughing process in the overflow product (the used collector is Z-200 + B03, the dosage is 21 + 45g/t; the frother is No. two oil, the dosage is 21g/t); performing the copper flotation concentration I once on the copper flotation concentrate (the pH value is controlled so that the pH value is between 11 to 12 during the flotation ) to obtain copper flotation concentrate and the second middlings; the second middlings are returned to the copper roughing process in sequence; performing the copper flotation concentration II once again on the copper flotation concentrate (the pH is controlled so that the pH value is between 11 to 12 during the flotation) to obtain the final copper concentrate s and the first middlings, and the first middlings are returned to the copper flotation concentration I in sequence. Performing the copper flotation scavenging process on the tailings obtained from the copper flotation roughing process (the used collector is Z-200 + B03, the dosage is 7 + 15g/t; the frother is No. two oil ,the dosage is 7g/t); the 1o flotation concentrate is returned to the copper flotation roughing process, and the flotation tailings are subjected to the next magnetic separation operation. (3) Performing one roughing process and one scavenging process of sulfur concentrate on the copper scavenging tailings. The operation 1s in detail is as follows: performing the sulfur roughing process on the copper scavenging tailings (with 6000g/t of sulfuric acid, 100g/t of Sodium Ethyl Xanthate, 21g/t of No. two oil and 13 minutes of flotation time) to obtain sulfur concentrate products. Performing the sulfur scavenging process to the flotation tailings obtained from the said sulfur roughing process (with 2000g/t of sulfuric acid, 35g/t of Sodium Ethyl Xanthate , 7g/t of No. two oil and 5 minutes of flotation time); the foam products are returned to the said sulfur roughing process, and the flotation tailings enter the subsequent magnetic separation process. (4) The sulfur flotation process is followed by the magnetic separation process, and one magnetic separation roughing process shall be adopted. The specific operation is as follows: the magnetic separation roughing process is carried out on the iron ore (intensity of magnetic field is 111.4KA/M), the magnetic separation concentrate product is iron concentrate, and the tailings are final tailings. To sum up, the products after flotation are as the following table: ore grade recovery yield product yield Cu S Fe Cu S Fe copper 1.63 18.52 34.42 39.98 81.98 1.62 1.61 concentrate Sulfur 69.71 0.076 47.03 44.91 14.35 95.54 77.97 concentrate iron 6.08 0.027 0.51 65.77 0.44 0.09 9.97 concentrate tailings 22.58 0.053 4.18 18.58 3.23 2.75 10.45 raw ore 100.00 0.365 34.32 40.15 100.00 100.00 100.00
As is seen from the above embodiment, in the separation process of the present invention, a novel process flow is adopted to shorten the beneficiation process, and the adoption of a method of low alkali reduces the consumption of lime during the generation, improves the 1o subsequent dehydration process, and reduces the production cost. In addition, the equipment with combined action of various kinds of force fields brings a good effect in separation. Meanwhile, in the separation process, valuable metals in the copper-iron ore are comprehensively recovered, including metal objects such as copper, iron, sulfur, pyrrhotite and the like, resulting in reduced cost and increase benefits. With the specific embodiments described above, the object, technical proposal and beneficial effects of the present invention are described in further detail; it should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims (8)
1. A beneficiation method for pyrrhotite-containing ore, characterized in that the beneficiation method comprises the following steps: s carrying out a copper flotation roughing process to the pyrrhotite-containing ore, wherein the used collectors are: 0-(2-methylpropyl) N-ethylcarbamothioate Z-200, the dosge being 20 to 23g/t, and Sodium Ethyl Xanthate B03, the dosge being 42 to 48 g/t; the frother is No. two oil, the dosge being 20 to 22g/t; carrying out two copper flotation concentrating processes on the obtained copper flotation concentrate; carrying out a copper flotation scavenging process to the tailings obtained from the copper flotation roughing process, wherein the used collectors are: 0-(2-methylpropyl) N-ethylcarbamothioate is Z-200, the dosage being 5 to 9g/t, and Sodium Ethyl Xanthate B03, the dosage being 10 to 20g/t; the frother is No. two oil, the dosage b e i n g 6 t o 8 g / t; carrying out sulfur flotation roughing process to the tailings obtained from the said copper flotation scavenging process, wherein there are used 5500-6500g/t of sulfuric acid, 95-105 g/t of Sodium Ethyl Xanthate, 20-22g/t of the No. two oil and 12-13 minutes of flotation time; carrying out a sulfur flotation scavenging process to the tailings obtained from the said sulfur flotation roughing process, wherein there are used 1800-2000g/t of sulfuric acid, 30-40g/t of Sodium Ethyl Xanthate, 6-8g/t of No. two oil and 4-5 minutes of flotation time; carrying out a magnetic separation process to the tailings obtained from the said sulfur flotation scavenging process to gain iron concentrate.
2. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that the frother used in the said copper s flotation roughing process for pyrrhotite-containing ore is No. two oil, the dosage being 21 g/t.
3. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that the two copper flotation concentration processes are divided into a first copper flotation concentration process and a second copper flotation concentration process; the said second copper flotation concentration process also produces first middlings, and the first middlings is returned to the first copper flotation concentration process.
4. The beneficiation method for pyrrhotite-containing ore according 1s to claim 3, characterized in that the first copper flotation concentration process also produces second middlings, and the said second middlings are returned to the copper flotation roughing process.
5. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that third middlings obtained from the said copper flotation scavenging process are returned to the said copper flotation roughing process.
6. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that fourth middlings obtained from the said sulfur flotation scavenging process are returned to the said sulfur flotation roughing process.
7. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that copper concentrate is obtained after the said two copper flotation concentration processes.
8. The beneficiation method for pyrrhotite-containing ore according to claim 1, characterized in that the sulfur concentrate is obtained after the said sulfur flotation roughing process.
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| CN201910812772.8 | 2019-08-29 | ||
| CN201910812772.8A CN110586337A (en) | 2019-08-29 | 2019-08-29 | Low-alkali flotation-followed-magnetism-based beneficiation method for pyrite containing magnetism |
| PCT/CN2020/112257 WO2021037243A1 (en) | 2019-08-29 | 2020-08-28 | Pyrrhotite mineral processing method using low-alkali process of flotation followed by magnetic separation |
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| CN114749270A (en) * | 2022-04-15 | 2022-07-15 | 昆明冶金研究院有限公司 | Mineral processing technology for recovering copper from copper-sulfur ore containing secondary copper sulfide ore |
| CN115582222A (en) * | 2022-01-24 | 2023-01-10 | 昆明理工大学 | Beneficiation auxiliary agent for high-sulfur copper-sulfur ore and beneficiation method |
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| CN110586337A (en) * | 2019-08-29 | 2019-12-20 | 江西理工大学 | Low-alkali flotation-followed-magnetism-based beneficiation method for pyrite containing magnetism |
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| CN113976331B (en) * | 2021-10-22 | 2023-07-25 | 昆明理工大学 | Method for preparing high-purity pyrite through flotation mass transfer dynamics regulation and control |
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| FR2608462B3 (en) * | 1986-06-06 | 1988-12-09 | Penarroya Miniere Metall | PROCESS FOR RECOVERY OF NON-FERROUS METALS CONTAINED IN PYRRHOTINIFIED SULFIDE ORES |
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| CN108672101B (en) * | 2018-07-09 | 2021-04-20 | 玉溪矿业有限公司 | Method for activating and floating sulfur in copper sulfide and sulfur ore copper separation tailings |
| CN110586337A (en) * | 2019-08-29 | 2019-12-20 | 江西理工大学 | Low-alkali flotation-followed-magnetism-based beneficiation method for pyrite containing magnetism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115582222A (en) * | 2022-01-24 | 2023-01-10 | 昆明理工大学 | Beneficiation auxiliary agent for high-sulfur copper-sulfur ore and beneficiation method |
| CN114749270A (en) * | 2022-04-15 | 2022-07-15 | 昆明冶金研究院有限公司 | Mineral processing technology for recovering copper from copper-sulfur ore containing secondary copper sulfide ore |
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| WO2021037243A1 (en) | 2021-03-04 |
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