Production system for extracting coarse-grained alloy from high-nickel matte ore grinding loop
By improving the grinding and screening process, the coarse-grained alloy in the high-nickel matte grinding circuit is subjected to multi-stage magnetic separation and regrinding treatment, which solves the problem of low recovery rate of coarse-grained alloy, achieves efficient recovery of precious metals and increase of alloy yield, and improves the dispersion loss of precious metals.
Patent Information
- Application Number
- CN202422988950.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the existing technology, the recovery rate of coarse-grained alloy in the high-nickel matte grinding circuit is low, the precious metals are severely dispersed, and the traditional process flow is difficult to effectively improve the yield and grade, resulting in serious dispersion and loss of precious metals during the mineral processing process.
The staged grinding and screening process of "one roughing + coarse and fine regrinding + one fine cleaning + one scavenging + middling regrinding" is adopted to recover the coarse-grained alloy from the sand returned from the second stage of classification. The combination of multi-stage magnetic separators and screw conveyors can achieve multiple enrichment and recovery of precious metals.
The yield of coarse-grained alloy and the recovery rate of precious metals are improved, the dispersion of precious metals in flotation operations is reduced, and the quality and economic benefits of alloy products are improved.
Smart Images
Figure CN223445603U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to mineral processing technical field, concretely relates to a kind of production system of extracting coarse-grained alloy from high nickel matte grinding circuit. BACKGROUND
[0002] High nickel matte is an important intermediate product in nickel smelting process, is a kind of artificial nickel, copper sulphide mineral, and its basic phase composition is nickel sulfide (Ni3S2), copper sulfide (Cu2S) and nickel-iron alloy (Cu-Ni-Fe), wherein sulfide accounts for more than 90%. High nickel matte contains platinum, palladium, gold and other precious metals, grade is generally 28~32g / t, and most of them are enriched in alloy.
[0003] Nickel-iron alloy has large density and good ductility, most of the alloy is extruded by steel ball to form flaky material with relatively coarse granularity in grinding process, and is collected in returned sand in classification operation, and alloy is continuously accumulated with returned sand in closed circuit grinding circuit composed of spiral classifier and grinding mechanism, and precious metal is cyclically enriched, and precious metal grade of one-stage classification returned sand is about 45g / t, and precious metal grade of two-stage classification returned sand can reach 135g / t;Small part of alloy is thinned and fine after grinding, and is accompanied by overflow into flotation process in classification process, and is mainly deposited in nickel concentrate after copper-nickel separation. Nickel-iron alloy has magnetism, and alloy rich in precious metal can be obtained by magnetic separation method. Because two-stage classification returned sand has higher precious metal content, coarse-grained alloy recovery is generally arranged in two-stage classification operation of grinding circuit. Fine-grained alloy recovery is generally arranged before nickel concentrate dewatering operation.
[0004] In existing system, coarse-grained alloy recovery process adopts one-stage magnetic separation process, and its yield relative to high nickel matte raw ore is about 6%, yield relative to two-stage classification returned sand is 26~28%, and precious metal grade is about 260g / t;The recovery process of fine-grained alloy adopts the magnetic separation process of "one roughing + one scavenging", and its yield relative to high nickel matte raw ore is about 2.5%, yield relative to nickel concentrate is about 4~5%, and precious metal grade is 75~85g / t. The yield of coarse-grained alloy in traditional process flow is low, the enrichment degree of precious metal is not enough, and the recovery rate of precious metal relative to two-stage classification returned sand is not more than 60%.
[0005] Therefore, the structure of alloy recovery system should be optimized, the alloy recovery process should be improved, especially the coarse-grained alloy recovery process should be improved to extract alloy in grinding circuit quickly and efficiently, the phenomenon that alloy is not recovered in time and enters flotation operation with finer granularity after multiple grinding should be improved, and the dispersion of precious metal in beneficiation process should be reduced. At the same time, on the basis of existing beneficiation index, the yield and quality of coarse-grained alloy should be further improved, and the recovery rate of precious metal should be improved. UTILITY MODEL CONTENT
[0006] The utility model provides a kind of production system for extracting coarse grain alloy from high nickel matte grinding circuit, it has the advantages of timely and efficient recovery of coarse grain alloy, comprehensive improvement of coarse grain alloy yield and noble metal grade, improve the recovery rate of noble metal, can effectively reduce the yield of alloy into flotation operation, reduce the dispersion of noble metal in nickel, copper concentrate.
[0007] The production system provided by the utility model recovers coarse grain alloy from two-stage classification returned sand by adopting the stage grinding and separation process of "one roughing + coarse concentrate regrinding + one cleaning + one scavenging + middling reselection".
[0008] The production system for extracting coarse grain alloy from high nickel matte grinding circuit includes roughing magnetic separator, coarse concentrate screw conveyor, grinding machine, coarse concentrate pump pool, ore pulp agitator, coarse concentrate slurry pump, cleaning magnetic separator, high-grade alloy screw conveyor, high-grade alloy bin, scavenging magnetic separator, middling reselection magnetic separator, low-grade alloy screw conveyor, low-grade alloy bin, tailings pump pool, tailings slurry pump, two-stage grinding machine and chute.
[0009] The two-stage classification returned sand is connected to the roughing magnetic separator through the chute, and the roughing magnetic separator is used for roughing material.
[0010] The tailings discharge end of the roughing magnetic separator is connected to the scavenging magnetic separator.
[0011] The ore discharge end of the grinding machine is connected to the coarse concentrate pump pool, and the coarse concentrate pump pool is provided with an ore pulp agitator.
[0012] The concentrate discharge end of the cleaning magnetic separator is connected to the high-grade alloy screw conveyor, and the high-grade alloy screw conveyor is connected to the high-grade alloy bin.
[0013] The utility model discloses a beneficial effect is: adopt " one rough selection + rough fine grinding + one selection + one sweep selection + middling reselection " stage grinding selection process, can improve the process selection condition, realize the early collection of coarse particle alloy fast collection, reduce precious metal dispersion, further improve the yield of coarse particle alloy and precious metal grade, promote the efficient utilization of ore resources, and further optimize economic benefit. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the production process chart of the utility model;
[0015] Figure 2 It is the equipment image contact chart of the utility model;
[0016] In the drawing: 1 - rough selection magnetic separator;2 - rough concentrate screw conveyor;3 - grinding machine;4 - rough concentrate pump pool;5 - ore pulp agitator;6 - rough concentrate slag slurry pump;7 - selected magnetic separator;8 - high-grade alloy screw conveyor;9 - high-grade alloy warehouse;10 - sweep selection magnetic separator;11 - middling reselection magnetic separator;12 - low-grade alloy screw conveyor;13 - low-grade alloy warehouse;14 - tailings pump pool;15 - tailings slag slurry pump;16 - two-stage grinding machine;17 - chute. DETAILED DESCRIPTION
[0017] The utility model will be further described in connection with the drawings and specific embodiment:
[0018] As Figure 1 And 2 Shown, production system includes rough selection magnetic separator 1, rough concentrate screw conveyor 2, grinding machine 3, rough concentrate pump pool 4, ore pulp agitator 5, rough concentrate slag slurry pump 6, selected magnetic separator 7, high-grade alloy screw conveyor 8, high-grade alloy warehouse 9, sweep selection magnetic separator 10, middling reselection magnetic separator 11, low-grade alloy screw conveyor 12, low-grade alloy warehouse 13, tailings pump pool 14, tailings slag slurry pump 15, two-stage grinding machine 16, chute 17, and the connection feeding mode of each component is as follows:
[0019] Two-stage classification sand returns through chute 17 and connects to rough selection magnetic separator 1, and rough selection magnetic separator 1 is used for rough selection material;The concentrate discharge end of rough selection magnetic separator 1 is connected to rough concentrate screw conveyor 2, and the discharge end of rough concentrate screw conveyor 2 is connected to grinding machine 3;The tailings discharge end of rough selection magnetic separator 1 is connected to sweep selection magnetic separator 10.
[0020] The discharge end of the mill 3 is connected to a rough concentrate pump pool 4, and the rough concentrate pump pool 4 is provided with a slurry agitator 5, and the rough concentrate pump pool 4 is connected to a concentrate magnetic separator 7 through a concentrate slurry pump, the concentrate magnetic separator 7 is used for further enrichment of high-grade alloy; the concentrate discharge end of the concentrate magnetic separator 7 is connected to a high-grade alloy screw conveyor 8, and the discharge end of the high-grade alloy screw conveyor 8 is connected to a high-grade alloy bin 9.
[0021] The concentrate outlet of the scavenging magnetic separator 10 and the tailing outlet of the concentrate magnetic separator 7 are combined and connected to a middling re-concentration magnetic separator 11, and the middling re-concentration magnetic separator 11 is used for recycling precious metals again; the concentrate discharge end of the middling re-concentration magnetic separator 11 is connected to a low-grade alloy screw conveyor 12, and the discharge end of the low-grade alloy screw conveyor 12 is connected to a low-grade alloy bin 13.
[0022] The tailing outlet of the scavenging magnetic separator 10 and the tailing outlet of the middling re-concentration magnetic separator 11 are connected to a tailing pump pool 14 by gravity, and the tailing pump pool 14 is connected to a two-stage mill 16 through a tailing slurry pump 15.
[0023] The specific working process of the production system is as follows: the two-stage classified returned sand is given to the rough magnetic separator 1 through the chute 17 for preliminary separation, the precious metals are preliminarily enriched in the process, the obtained rough concentrate is sent to the mill 3 for grinding through the rough concentrate screw conveyor 2, and the rough tailing is self-flowed into the scavenging magnetic separator 10 for further recycling of the precious metals. The mill 3 is connected to the rough concentrate pump pool 4, and the rough concentrate pump pool 4 is provided with a slurry agitator 5, and the rough concentrate pump pool 4 is connected to the concentrate magnetic separator 7 through the concentrate slurry pump 6, so that the precious metals are further enriched to obtain the high-grade alloy, and then the high-grade alloy is transported to the high-grade alloy bin 9 by the high-grade alloy screw conveyor 8. The concentrate of the scavenging magnetic separator 10 and the tailing of the concentrate magnetic separator 7 are combined and entered into the middling re-concentration magnetic separator 11 for recycling of the precious metals again, and the obtained low-grade alloy is sent to the low-grade alloy bin 13 for storage through the low-grade alloy screw conveyor 12. The tailing of the scavenging magnetic separator 10 and the tailing of the middling re-concentration magnetic separator 11 are self-flowed into the tailing pump pool 14 as the final tailing, and are transported back to the two-stage mill 16 through the tailing slurry pump 15.
[0024] In the grinding circuit, the coarse-grained alloy is efficiently extracted, on the one hand, the amount of the precious metal particles entering the flotation operation can be reduced, and the adverse effects of the dispersion loss of the precious metal minerals in the beneficiation process can be improved; on the other hand, the content of the precious metals in the nickel and copper concentrate can be reduced, and the quality of the concentrate product is improved, so that favorable conditions are provided for subsequent smelting and purification and impurity removal processes.
[0025] Compared with the original process, the coarse alloy recovery process adopted by the production system increases coarse and fine regrinding, cleaning, and middling re-concentration operations. Coarse and fine regrinding can effectively improve the liberation degree of nickel-iron alloy and reduce the content of intergrowth, create better process conditions for efficient recovery of alloy, and further improve the recovery rate of precious metals. The cleaning operation can further improve the precious metal grade of coarse alloy and provide high-quality raw material guarantee for the downstream process. The scavenging operation can extract precious metal components from the coarse tailings, reduce the precious metal content of the tailings, strengthen the effective recovery of alloy minerals, reduce the loss of precious metals, and further improve the utilization rate of mineral resources. The middling re-concentration operation can recover the residual precious metal minerals in the cleaning tailings and scavenging concentrate, further improve the recovery rate of precious metals, and the re-concentrated concentrate can be sold as low-grade coarse alloy products.
[0026] The production system can produce high-grade alloy and low-grade alloy at the same time, and can meet the raw material needs of different customers and different processes.
[0027] Compared with the existing system, the production system increases the yield of coarse alloy by 9-11 percentage points, and the recovery rate of precious metals by 17 percentage points. Under the premise of ensuring the steady improvement of the yield of coarse alloy and the recovery rate of precious metals, the quality of coarse alloy products has also been greatly improved, and the precious metal grade has been increased from 260g / t in the existing system to 335-345g / t, truly achieving efficient recovery of precious metals and effectively controlling the dispersion degree of precious metals.
[0028] The coarse concentrate pump tank 4 and the tailings pump tank 14 are circular pump tanks, which have good fluid mechanics characteristics and good slurry flowability compared with rectangular pump tanks, and are not easy to form dead zones.
[0029] The alloy has a large density and is easy to settle in the slurry. The slurry agitator 5 is arranged in the coarse concentrate pump tank 4, which can keep the alloy mineral particles in a suspended state and effectively prevent the deposition and death of alloy particles.
Claims
1. A production system for extracting coarse-grained alloy from a high-nickel matte grinding circuit, characterized in that: The production system includes a coarse concentrate magnetic separator (1), a coarse concentrate screw conveyor (2), a grinding mill (3), a coarse concentrate pump tank (4), a slurry agitator (5), a coarse concentrate slurry pump (6), a fine concentrate magnetic separator (7), a high-grade alloy screw conveyor (8), a high-grade alloy bin (9), a scavenging magnetic separator (10), a middling re-selection magnetic separator (11), a low-grade alloy screw conveyor (12), a low-grade alloy bin (13), a tailings pump tank (14), a tailings slurry pump (15), a secondary grinding mill (16), and a chute (17); the connection and feeding methods of the various components are as follows: The secondary graded return sand is connected to the roughing magnetic separator (1) through a chute (17), and the roughing magnetic separator (1) is used for roughing materials; the concentrate discharge end of the roughing magnetic separator (1) is connected to the roughing concentrate screw conveyor (2), and the discharge end of the roughing concentrate screw conveyor (2) is connected to the grinding mill (3); the tailings discharge end of the roughing magnetic separator (1) is connected to the scavenging magnetic separator (10); The discharge end of the grinding mill (3) is connected to a coarse concentrate pump pool (4), a slurry agitator (5) is provided in the coarse concentrate pump pool (4), the coarse concentrate pump pool (4) is connected to a concentration magnetic separator (7) through a concentrate slurry pump, and the concentration magnetic separator (7) is used to further enrich high-grade alloys; the concentrate discharge end of the concentration magnetic separator (7) is connected to a high-grade alloy screw conveyor (8), and the discharge end of the high-grade alloy screw conveyor (8) is connected to a high-grade alloy bin (9); The concentrate outlet of the scavenging magnetic separator (10) and the tailings outlet of the concentrating magnetic separator (7) are combined and connected to the middling reselection magnetic separator (11), which is used to recover precious metals again; the concentrate discharge end of the middling reselection magnetic separator (11) is connected to the low-grade alloy screw conveyor (12), and the discharge end of the low-grade alloy screw conveyor (12) is connected to the low-grade alloy bin (13); The tailings outlet of the scavenging magnetic separator (10) and the tailings outlet of the middling re-selection magnetic separator (11) are connected to the tailings pump pool (14) by gravity, and the tailings pump pool (14) is connected to the secondary grinding mill (16) via the tailings slurry pump (15).