Flotation method for copper sulfide ore with non-uniform dissemination granularity

Abstract

The invention discloses a flotation method for disseminated copper sulphide ore with non-uniform granularity, which is characterized in that monomer or intergrowth-enriched copper sulphide ore enriched in settled sand of a cyclone is recycled in advance through flash flotation, and meanwhile, a high-grade copper concentrate product with larger granularity is directly produced by utilizing the characteristic of short flash flotation time. And metal loss caused by over-crushing is avoided. And further, through graded flotation, the interaction influence between the coarse-grain minerals and the fine-grain minerals is weakened, and the flotation efficiency of the fine-grain minerals is improved. According to the method, through combined use of flash flotation and graded flotation, efficient recycling of copper sulfide ore resources with non-uniform disseminated particle sizes is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a flotation method for copper sulfide ore with uneven distribution of particle sizes. Background Art

[0002] With the rapid increase of copper consumption in my country and the continuous development and utilization of high-quality mineral resources, easy-to-process ores are gradually decreasing, and copper ore resources with uneven particle size have become one of the main sources of copper recovery. For ores with uneven particle size, especially fine-grained minerals, in order to achieve the full dissociation of fine-grained minerals, it usually causes over-grinding and mudification of coarse-grained minerals, resulting in the loss of some metals in the tailings. At the same time, the efficient flotation recovery of fine-grained minerals has always been the focus and difficulty of flotation.

[0003] At present, most mines at home and abroad use cyclone classification in the grinding and classification circuit. In this case, there will inevitably be coarse-grained monomer dissociated minerals enriched in the cyclone sand settling. If effective measures are not taken to recover them, these dissociated monomers will re-enter the mill, resulting in over-grinding, and will also increase the fine-grained content in the flotation system, thereby affecting the flotation index. For copper sulfide minerals with fine particles embedded in them, while achieving the dissociation of target mineral monomers through grinding, the proportion of fine particles in the slurry will increase sharply. Fine particles will absorb a large amount of flotation reagents during the flotation process, reducing the probability of the mineral and reagent interacting, and fine mineral particles will undergo non-selective flocculent phenomenon, resulting in a decrease in the selectivity of the flotation process, which seriously affects the flotation efficiency. Therefore, the development of a beneficiation method for copper sulfide ores with uneven embedded particle size is of great significance to improving the overall utilization rate of copper ore resources. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a flotation method for copper sulfide ore with uneven particle size.

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

[0006] A flotation method for copper sulfide ore with uneven particle size, comprising the following steps:

[0007] S1. Flash flotation: The raw ore is ground and classified once using a cyclone; the sediment obtained from the first classification is added with a collector and a frother for flash flotation to obtain copper concentrate and flash flotation tailings, and the flash flotation tailings are returned to the grinding mill;

[0008] S2, classification: the overflow obtained from the first classification is subjected to secondary classification by using a hydrocyclone, the sediment obtained from the secondary classification enters step S3 for coarse particle flotation, and the overflow obtained from the secondary classification enters step S4 for fine particle flotation;

[0009] S3. Coarse particle flotation: Coarse particle flotation includes one coarse particle roughing and two coarse particle concentrations; in the coarse particle roughing operation, a collector and a frother are added, and the foam product obtained from the coarse particle roughing operation is fed into the coarse particle concentration operation 1, and the bottom flow obtained from the coarse particle roughing operation is tailings 1; in the coarse particle concentration operation 1, a collector is added, and the foam product obtained from the coarse particle concentration operation 1 is fed into the coarse particle concentration operation 2, and the bottom flow obtained from the coarse particle concentration operation 1 is returned to the coarse particle roughing operation; in the coarse particle concentration operation 2, a collector is added, and the foam product obtained from the coarse particle concentration operation 2 is copper concentrate 2, and the bottom flow obtained from the coarse particle concentration operation 2 is returned to the coarse particle concentration operation 1;

[0010] S4. Fine particle flotation: Fine particle flotation includes one fine particle roughing selection and two fine particle concentration selections. Adjusters, collectors and frothers are added in the fine particle roughing selection operation. The foam product obtained in the fine particle roughing selection operation is fed into the fine particle concentration operation one, and the bottom flow obtained in the fine particle roughing selection operation is tailings two; collectors are added in the fine particle concentration operation one, and the foam product obtained in the fine particle concentration operation one is fed into the fine particle concentration operation two, and the bottom flow obtained in the fine particle concentration operation one is returned to the fine particle roughing selection operation; collectors are added in the fine particle concentration operation two, and the foam product obtained in the fine particle concentration operation two is copper concentrate three, and the bottom flow obtained in the fine particle concentration operation two is returned to the fine particle concentration operation one.

[0011] Furthermore, in step S1, the particle size of the sediment obtained by the first classification is -200 μm, accounting for 75-85%, and the mass concentration of solid particles in the ore pulp in the flash flotation is between 65% and 70%; the collector includes isobutyl xanthate, and the frother includes FLORREA522. Based on the dry weight of each ton of raw ore, the amount of isobutyl xanthate is 20-25 g / t, and the amount of FLORREA 522 is 15-20 g / t; the flash flotation time is 40 seconds to 60 seconds.

[0012] Furthermore, in step S2, the particle size of the overflow obtained after the first classification is -38 μm, accounting for 85-90%, the +20 μm particle size accounts for 75-80% of the sediment obtained after the second classification, and the -20 μm particle size accounts for 80-85% of the overflow obtained after the second classification.

[0013] Further, in step S3, in the coarse particle roughing operation, the collector includes isobutyl xanthate, and the frother includes FLORREA 522; based on the dry weight of each ton of raw ore, the dosage of isobutyl xanthate is 60-80 g / t, and the dosage of FLORREA 522 is 20-30 g / t; the mass concentration of solid particles in the slurry in the coarse particle roughing operation is between 37% and 42%; the collectors in the coarse particle selection operation 1 and the coarse particle selection operation 2 both include isobutyl xanthate, and the dosage is 15-20 g / t based on the dry weight of each ton of raw ore.

[0014] Further, in step S4, in the fine particle roughing operation, the adjusting agent includes water glass, the collecting agent includes isobutyl xanthate, and the frother includes FLORREA 522. Based on the dry weight of each ton of raw ore, the amount of water glass is 500-550 g / t, the amount of isobutyl xanthate is 140-160 g / t, and the amount of FLORREA 522 is 40-50 g / t; the mass concentration of solid particles in the slurry in the fine particle roughing operation is between 18% and 22%; the collecting agents used in the fine particle selection operation 1 and the fine particle selection operation 2 are both isobutyl xanthate, and based on the dry weight of each ton of raw ore, the amount of isobutyl xanthate in the fine particle selection operation 1 is 30-40 g / t, and the amount of isobutyl xanthate in the fine particle selection operation 2 is 10-20 g / t.

[0015] Further, copper concentrate 1, copper concentrate 2 and copper concentrate 3 are combined into total copper concentrate, and tailings 1 and tailings 2 are combined into total tailings.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention recovers the monomer or intergrowth-rich copper sulfide minerals accumulated in the cyclone sand settling in advance through flash flotation, and directly produces high-grade, coarse-grained copper concentrate products by utilizing the short time of flash flotation, thereby avoiding metal loss caused by over-crushing.

[0018] 2. The present invention reduces the interaction between coarse-grained and fine-grained minerals through graded flotation, thereby improving the flotation efficiency of fine-grained minerals.

[0019] 3. Through the combined use of flash flotation and graded flotation, efficient recovery and utilization of copper sulfide ore resources with uneven particle size is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an overall flow chart of the method of the embodiment of the present invention;

[0021] Figure 2 This is the overall flow chart of the production process of Comparative Example 1. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0023] A copper mine abroad contains 4.95% copper, and the main copper-containing minerals are chalcocite, bornite and other copper sulfide minerals. Under the condition that the grinding fineness of -200μm accounts for 80%, the monomer dissociated copper sulfide minerals account for 31.65%, of which 28.40% are distributed in the 20-147μm particle size. Flash flotation can be used to achieve early collection of this part of the monomer dissociated copper sulfide ore. Under the condition that the grinding fineness of -38μm accounts for 90%, the fine particle size of -20μm accounts for 62.25%, and the fine particle size of -10μm accounts for 45.58%. At the same time, under the condition that the grinding fineness of -38μm accounts for 90%, the monomer dissociation degree of copper sulfide minerals is 70.87%, mainly distributed in -20μm, and the poor intergrowth accounts for 7.39%, which is mainly distributed in the -20μm particle size and intergrows with the gangue minerals. It is a typical copper sulfide ore with uneven embedded particle size.

[0024] Example 1

[0025] This embodiment adopts a flotation method for copper sulfide ore with uneven particle size to process the above copper ore. Figure 1 As shown, the steps include:

[0026] (1) Flash flotation: The ore is ground and classified once through a cyclone. The content of -200μm in the sediment accounts for 75%. The sediment obtained from the first classification is fed into the flash flotation system. Based on the dry weight of the ore, 20g / t of collector isobutyl xanthate and 15g / t of frother FLORREA 522 are added (for details, please refer to http: / / www.florrea.com / product / detail?id=116 ), the mass concentration of solid particles in the flash flotation slurry is 65%, and the copper concentrate is obtained by flotation for 40 seconds. The flash flotation tailings are returned to the grinding and classification circuit;

[0028] (2) Classification: The overflow obtained in the first classification (the content of -38 μm in the overflow accounts for 85%) is subjected to secondary classification. The content of +20 μm in the sediment obtained in the second classification accounts for 75%, and the content of -20 μm in the overflow accounts for 85%. The sediment and overflow obtained in the second classification are respectively fed into the coarse particle flotation system and the fine particle flotation system;

[0029] (3) Coarse particle flotation: Coarse particle flotation includes one coarse particle roughing and two coarse particle concentrations. Based on the dry weight of each ton of raw ore, 60 g / t of collector isobutyl xanthate and 20 g / t of frother FLORREA 522 are added in the coarse particle roughing operation. The mass concentration of solid particles in the ore pulp from the coarse particle roughing is 37%. The foam product obtained from the coarse particle roughing operation is fed to the coarse particle concentration operation I, and the bottom flow is tailings I (coarse particle tailings). 15 g / t of collector isobutyl xanthate is added to the coarse particle concentration operation I, and the foam product obtained from the coarse particle concentration operation I is fed to the coarse particle concentration operation II. The bottom flow of the coarse particle concentration operation I is returned to the coarse particle roughing operation. 15 g / t of collector isobutyl xanthate is added to the coarse particle concentration operation II, and the foam product obtained from the coarse particle concentration operation II is copper concentrate II (coarse particle concentrate). The bottom flow from the coarse particle concentration operation II is returned to the coarse particle concentration operation I.

[0030] (4) Fine particle flotation: Coarse particle flotation includes one fine particle roughing and two fine particle concentrations. Based on the dry weight of each ton of raw ore, 500 g / t of water glass as an adjusting agent, 140 g / t of isobutyl xanthate as a collector and 40 g / t of frother FLORREA 522 as a frother are added in the fine particle roughing operation. The solid particle mass concentration of the ore pulp in the fine particle roughing operation is 18%. The foam product obtained from the fine particle roughing operation is fed to the fine particle concentration operation I. The underflow obtained from the fine particle roughing operation is tailings II (fine particle tailings). 30 g / t of isobutyl xanthate as a collector is added to the fine particle concentration operation I. The foam product obtained from the fine particle concentration operation I is fed to the fine particle concentration operation II. The underflow obtained from the fine particle concentration operation I is returned to the fine particle roughing operation. 10 g / t of isobutyl xanthate as a collector is added to the fine particle concentration operation II. The foam product obtained from the fine particle concentration operation II is copper concentrate III (fine particle concentrate). The underflow obtained from the fine particle concentration operation II is returned to the fine particle concentration operation I.

[0031] Example 2

[0032] This embodiment adopts a flotation method for copper sulfide ore with uneven particle size to process the above copper ore. Figure 1 As shown, the steps include:

[0033] (1) Flash flotation: The ore is ground and classified once through a hydrocyclone. The content of -200 μm in the sediment accounts for 85%. The sediment obtained from the first classification is fed into the flash flotation system. Based on the dry weight of the ore, 25 g / t of collector isobutyl xanthate and 20 g / t of frother FLORREA 522 are added. The mass concentration of solid particles in the ore pulp in the flash flotation is 70%. The copper concentrate is obtained by flotation for 60 seconds. The flash flotation tailings are returned to the grinding and classification circuit;

[0034] (2) Classification: The overflow obtained in the first classification (the content of -38 μm in the overflow accounts for 90%) is subjected to secondary classification. The content of +20 μm in the sediment obtained in the second classification accounts for 80%, and the content of -20 μm in the overflow accounts for 80%. The sediment and overflow obtained in the second classification are respectively fed into the coarse particle flotation system and the fine particle flotation system;

[0035] (3) Coarse particle flotation: Coarse particle flotation includes one coarse particle roughing and two coarse particle concentrations. Based on the dry weight of each ton of raw ore, 80g / t of collector isobutyl xanthate and 30g / t of frother FLORREA 522 are added in the coarse particle roughing operation. The mass concentration of solid particles in the ore pulp from the coarse particle roughing is 42%. The foam product obtained from the coarse particle roughing operation is fed to the coarse particle concentration operation I, and the bottom flow is tailings I (coarse particle tailings). 20g / t of collector isobutyl xanthate is added to the coarse particle concentration operation I, and the foam product obtained from the coarse particle concentration operation I is fed to the coarse particle concentration operation II. The bottom flow of the coarse particle concentration operation I is returned to the coarse particle roughing operation. 20g / t of collector isobutyl xanthate is added to the coarse particle concentration operation II, and the foam product obtained from the coarse particle concentration operation II is copper concentrate II (coarse particle concentrate). The bottom flow from the coarse particle concentration operation II is returned to the coarse particle concentration operation I.

[0036] (4) Fine particle flotation: Coarse particle flotation includes one fine particle roughing and two fine particle concentrations. Based on the dry weight of each ton of raw ore, 550 g / t of water glass as an adjusting agent, 160 g / t of isobutyl xanthate as a collector and 50 g / t of frother FLORREA 522 as a frother are added in the fine particle roughing operation. The solid particle mass concentration of the ore pulp in the fine particle roughing operation is 22%. The foam product obtained from the fine particle roughing operation is fed to the fine particle concentration operation I. The underflow obtained from the fine particle roughing operation is tailings II (fine particle tailings). 40 g / t of isobutyl xanthate as a collector is added to the fine particle concentration operation I. The foam product obtained from the fine particle concentration operation I is fed to the fine particle concentration operation II. The underflow obtained from the fine particle concentration operation I is returned to the fine particle roughing operation. 20 g / t of isobutyl xanthate as a collector is added to the fine particle concentration operation II. The foam product obtained from the fine particle concentration operation II is copper concentrate III (fine particle concentrate). The underflow obtained from the fine particle concentration operation II is returned to the fine particle concentration operation I.

[0037] Comparative Example 1

[0038] This comparative example adopts the on-site designed flotation process to treat the above copper ore. Figure 2 As shown, the steps include:

[0039] (1) Rough scavenging: After the raw ore is ground to -53μm, accounting for 80%, 200g / t of collector isobutyl xanthate and 80g / t of frother FLORREA 522 are added to the roughing process based on the dry weight of each ton of raw ore. The foam from the roughing process is fed to the concentrating process to obtain concentrate 1; 60g / t of collector isobutyl xanthate and 50g / t of frother FLORREA 522 are further added to the roughing underflow to obtain scavenging concentrate, and the underflow is tailing 1;

[0040] (2) Sweep and concentrate: The above-mentioned tailings and scavenged concentrate are combined into the scavenged concentrate operation. Based on the dry weight of each ton of raw ore, 50g / t of collector isobutyl xanthate is added. The foam product is scavenged concentrate, and the underflow is tailings II;

[0041] (3) Regrinding and reselection of scavenging concentrate: The regrinding fineness of scavenging concentrate is -10μm, accounting for 80%. Based on the dry weight of each ton of raw ore, flotation includes one roughing and two concentrating operations. In the roughing operation, 150g / t of collector isobutyl xanthate and 20g / t of frother FLORREA 522 are added. The foam product obtained from the roughing operation is fed to the first concentrating operation, and the underflow is returned to the scavenging operation. 10g / t of collector isobutyl xanthate is added to the first concentrating operation. The foam product obtained from the first concentrating operation is fed to the second concentrating operation. The underflow of the first concentrating operation is returned to the roughing operation. 10g / t of collector isobutyl xanthate is added to the second concentrating operation. The foam product obtained from the second concentrating operation is copper concentrate II, and the underflow obtained from the second concentrating operation is returned to the first concentrating operation.

[0042] The process parameters of Examples 1, 2 and Comparative Example 1 are shown in Table 1.

[0043] It can be seen from the embodiments and the original on-site production indicators shown in Table 1 that the method of Example 1 recovers qualified copper concentrate products with a copper grade of about 50% and a recovery rate of more than 30% in advance through flash flotation, and the application of graded flotation greatly reduces the copper loss in the tailings. Compared with Comparative Example 1 (original production process flow), the combined application of flash flotation and graded flotation increases the overall copper recovery rate by more than about 4 percentage points, and the total copper concentrate grade is also increased from 43.75% to more than 46.5%, which has huge economic benefits.

[0044] Table 1

[0045]

[0046]

[0047] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. A flotation method for copper sulfide ore with uneven particle size, characterized in that: The steps include: S1. Flash flotation: The raw ore is ground and classified once using a cyclone; the sediment obtained from the first classification is added with a collector and a frother for flash flotation to obtain copper concentrate and flash flotation tailings, and the flash flotation tailings are returned to the grinding mill; S2, classification: the overflow obtained from the first classification is subjected to secondary classification by using a hydrocyclone, the sediment obtained from the secondary classification enters step S3 for coarse particle flotation, and the overflow obtained from the secondary classification enters step S4 for fine particle flotation; S3. Coarse particle flotation: Coarse particle flotation includes one coarse particle roughing and two coarse particle concentrations; in the coarse particle roughing operation, a collector and a frother are added, and the foam product obtained from the coarse particle roughing operation is fed into the coarse particle concentration operation 1, and the bottom flow obtained from the coarse particle roughing operation is tailings 1; in the coarse particle concentration operation 1, a collector is added, and the foam product obtained from the coarse particle concentration operation 1 is fed into the coarse particle concentration operation 2, and the bottom flow obtained from the coarse particle concentration operation 1 is returned to the coarse particle roughing operation; in the coarse particle concentration operation 2, a collector is added, and the foam product obtained from the coarse particle concentration operation 2 is copper concentrate 2, and the bottom flow obtained from the coarse particle concentration operation 2 is returned to the coarse particle concentration operation 1; S4. Fine particle flotation: Fine particle flotation includes one fine particle roughing selection and two fine particle concentration selections. Adjusters, collectors and frothers are added in the fine particle roughing selection operation. The foam product obtained in the fine particle roughing selection operation is fed into the fine particle concentration operation one, and the bottom flow obtained in the fine particle roughing selection operation is tailings two; collectors are added in the fine particle concentration operation one, and the foam product obtained in the fine particle concentration operation one is fed into the fine particle concentration operation two, and the bottom flow obtained in the fine particle concentration operation one is returned to the fine particle roughing selection operation; collectors are added in the fine particle concentration operation two, and the foam product obtained in the fine particle concentration operation two is copper concentrate three, and the bottom flow obtained in the fine particle concentration operation two is returned to the fine particle concentration operation one.

2. The method according to claim 1, characterized in that: In step S1, the particle size of the sediment obtained by the primary classification is -200 μm, accounting for 75-85%, and the mass concentration of solid particles in the ore pulp in the flash flotation is between 65% and 70%; the collector includes isobutyl xanthate, and the frother includes FLORREA 522. Based on the dry weight of each ton of raw ore, the dosage of isobutyl xanthate is 20-25 g / t, and the dosage of FLORREA 522 is 15-20 g / t; the flash flotation time is 40 seconds to 60 seconds.

3. The method according to claim 1, characterized in that In step S2, the particle size of the overflow obtained after the first classification is -38 μm, accounting for 85-90%, the +20 μm particle size accounts for 75-80% of the sediment obtained after the second classification, and the -20 μm particle size accounts for 80-85% of the overflow obtained after the second classification.

4. The method according to claim 1, characterized in that: In step S3, in the coarse particle selection operation, the collector includes isobutyl xanthate, and the frother includes FLORREA 522; based on the dry weight of each ton of raw ore, the dosage of isobutyl xanthate is 60-80 g / t, and the dosage of FLORREA 522 is 20-30 g / t; the mass concentration of solid particles in the slurry in the coarse particle selection operation is between 37% and 42%; the collectors in the coarse particle selection operation 1 and the coarse particle selection operation 2 both include isobutyl xanthate, and the dosage is 15-20 g / t based on the dry weight of each ton of raw ore.

5. The method according to claim 1, characterized in that In step S4, in the fine particle roughing operation, the adjusting agent includes water glass, the collecting agent includes isobutyl xanthate, and the frother includes FLORREA 522. Based on the dry weight of each ton of raw ore, the amount of water glass is 500-550 g / t, the amount of isobutyl xanthate is 140-160 g / t, and the amount of FLORREA 522 is 40-50 g / t; the mass concentration of solid particles in the slurry in the fine particle roughing operation is between 18% and 22%; the collecting agent used in the fine particle selection operation 1 and the fine particle selection operation 2 is isobutyl xanthate, and based on the dry weight of each ton of raw ore, the amount of isobutyl xanthate in the fine particle selection operation 1 is 30-40 g / t, and the amount of isobutyl xanthate in the fine particle selection operation 2 is 10-20 g / t.

6. The method according to claim 1, characterized in that Copper concentrate 1, copper concentrate 2 and copper concentrate 3 are combined into total copper concentrate, and tailings 1 and tailings 2 are combined into total tailings.

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