Production process for extracting coarse-grained alloy from high-nickel matte ore grinding loop
By adopting a multi-stage grinding process in the process of high-nickel sulfonium ore, the coarse-grain alloy recovery of the second-stage graded sand is recovered, and the problems of low recovery yield of coarse-grain alloys and dispersion of precious metals in the existing technology are solved, and the problem of low recovery yield of coarse-grain alloys and dispersion of precious metals is realized. Efficient recycling and optimization of economic benefits.
Patent Information
- Application Number
- CN202411775030.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-02-18
AI Technical Summary
In the prior art, the recovery yield of coarse-grained alloys is low and the degree of precious metals is insufficient, resulting in the dispersion of precious metals during the ore dressing process, and the adverse phenomenon of coarse-grained alloys entering flotation operation is relatively serious.
Using the stage grinding process of 'one coarse selection + coarse finish remix + one fine selection + one sweep selection + medium ore re-select', the second stage grading sand is recovered and the coarse-grain alloy is recycled through multi-stage magnetic separation and re-selecting. Grinding treatment improves the recovery and grade of precious metals.
It realizes early and fast harvesting of coarse-grain alloys, reduces precious metal dispersion, improves coarse-grain alloy yield and precious metal grade, improves precious metal recovery rate, and optimizes economic benefits.
Smart Images
Figure CN119464708A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit. Background Art
[0002] High nickel matte is an important intermediate product in the nickel smelting process. It is a man-made nickel, copper and sulfur mineral. Its basic phase composition is nickel sulfide (Ni3S2), copper sulfide (Cu2S) and nickel-iron alloy (Cu-Ni-Fe), of which sulfide accounts for more than 90%. High nickel matte contains precious metals such as platinum, palladium and gold, with a grade of generally 28-32g / t, and most of them are enriched in the alloy.
[0003] Nickel-iron alloy has high density and good ductility. Most of the alloy is squeezed by steel balls during the grinding process to form coarse-grained flakes. During the classification operation, it is collected in the returned sand. The alloy accumulates in the closed-circuit grinding circuit composed of spiral classifier and grinding machine with the returned sand, and the precious metals are cyclically enriched. The grade of precious metals in the first-stage returned sand is about 45g / t, and the grade of precious metals in the second-stage returned sand can reach 135g / t; a small part of the alloy becomes thinner and finer after grinding, and enters the flotation process with overflow during the classification process, and is mainly deposited in the nickel concentrate after copper and nickel separation. Nickel-iron alloy is magnetic, and alloys rich in precious metals can be obtained by magnetic separation. Because the content of precious metals in the returned sand of the second-stage classification is high, the recovery of coarse-grained alloy is generally set in the second-stage classification operation of the grinding circuit. The recovery of fine-grained alloy is often set before the dehydration operation of nickel concentrate.
[0004] In the existing system, the recovery process of coarse-grained alloy adopts a single magnetic separation process, with a yield of about 6% relative to high-nickel matte ore, a yield of 26-28% relative to the return of the second-stage classification, and a precious metal grade of about 260g / t; the recovery process of fine-grained alloy adopts a "one roughing + one sweeping" magnetic separation process, with a yield of about 2.5% relative to high-nickel matte ore, a yield of about 4-5% relative to nickel concentrate, and a precious metal grade of 75-85g / t. The yield of coarse-grained alloy in the traditional process is low, the degree of precious metal enrichment is not enough, and the precious metal recovery rate relative to the return of the second-stage classification does not exceed 60%.
[0005] Therefore, the alloy recovery system structure should be optimized, the alloy recovery process should be improved, and efforts should be made to improve the coarse-grained alloy recovery process, so as to quickly and efficiently extract the alloy in the grinding circuit, improve the undesirable phenomenon that the alloy is not recovered in time, resulting in multiple grindings and fine particles entering the flotation operation, and reduce the dispersion of precious metals in the mineral processing process. At the same time, on the basis of the existing mineral processing indicators, the yield and quality of coarse-grained alloys should be further improved, and the recovery rate of precious metals should be increased. Summary of the invention
[0006] The present invention provides a production process suitable for extracting coarse-grained alloy from a grinding circuit during the beneficiation of high-nickel matte ore. The production process has the advantages of timely and efficient recovery of coarse-grained alloy, comprehensive improvement of coarse-grained alloy yield and precious metal grade, and improvement of precious metal recovery rate. It can effectively reduce the yield of alloy entering flotation operation and reduce the dispersion of precious metals in nickel and copper concentrates.
[0007] The present invention adopts the staged grinding process of "one roughing + coarse and fine re-grinding + one cleaning + one scavenging + middling re-selection" to recover the coarse-grained alloy from the second-stage classification return sand. After the second-stage classification return sand is sorted, the final product is high-grade alloy and low-grade alloy, among which: the selected concentrate is high-grade alloy; the middling re-selected concentrate is low-grade alloy; the final tailings are scavenging tailings and middling re-selected tailings, all of which are returned to the second-stage grinding.
[0008] The production system of the present invention comprises a roughing magnetic separator, a coarse concentrate screw conveyor, a grinding machine, a coarse concentrate pump pool, a slurry agitator, a coarse concentrate slurry pump, a fine magnetic separator, a high-grade alloy screw conveyor, a high-grade alloy bin, a scavenging magnetic separator, a middling re-selection magnetic separator, a low-grade alloy screw conveyor, a low-grade alloy bin, a tailings pump pool, a tailings slurry pump, a second-stage grinding machine, and a chute.
[0009] The roughing magnetic separator, the fine magnetic separator, the scavenging magnetic separator, and the medium ore re-selection magnetic separator are all wet permanent magnetic drum magnetic separators, among which: the drum surface magnetic induction intensity of the roughing magnetic separator is 250mT, and the tank type is countercurrent; the drum surface magnetic induction intensity of the fine magnetic separator is 150mT, and the tank type is semi-countercurrent; the drum surface magnetic induction intensity of the scavenging magnetic separator is 500mT, and the tank type is countercurrent; the drum surface magnetic induction intensity of the medium ore re-selection magnetic separator is 150mT, and the tank type is countercurrent. Mill 3 is a wet overflow ball mill. The coarse concentrate pump pool and the tailings pump pool are both circular pump pools, and the structural type is not limited. A slurry agitator is provided in the coarse concentrate pump pool. The coarse concentrate slag slurry pump and the tailings slurry pump can use horizontal or vertical centrifugal pumps, and the flow rate and head should meet the process requirements. High-grade alloy silos and low-grade alloy silos are generally underground rectangular silos. In areas with high groundwater levels, ground-type or semi-underground structures can also be used. The second-stage grinding machine is the second-stage grinding equipment of the existing system. The self-flow slope of the chute should be no less than 35%.
[0010] The beneficial technical effect of the present invention is: adopting the staged grinding and selection process of "one roughing selection + coarse and fine grinding + one fine selection + one scavenging selection + medium ore reselection", the process selection conditions can be improved, the early and fast collection of coarse-grained alloys can be achieved, the dispersion of precious metals can be reduced, and the yield and precious metal grade of coarse-grained alloys can be further improved, the recovery rate of precious metals can be improved, the efficient utilization of ore resources can be promoted, and the economic benefits can be optimized. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1It is a production process flow chart of the present invention; Figure 2 It is a visual connection diagram of the production system equipment of the present invention; In the figure: 1-roughing magnetic separator; 2-coarse concentrate screw conveyor; 3-grinding mill; 4-coarse concentrate pump pool; 5-slurry agitator; 6-coarse concentrate slag slurry pump; 7-fine magnetic separator; 8-high-grade alloy screw conveyor; 9-high-grade alloy bin; 10-scavenging magnetic separator; 11-mid-grade re-selection magnetic separator; 12-low-grade alloy screw conveyor; 13-low-grade alloy bin; 14-tailings pump pool; 15-tailings slurry pump; 16-second-stage grinding mill; 17-chute. DETAILED DESCRIPTION
[0012] The specific working process of the production system described in the present invention is: the second-stage classified return sand is fed into the roughing magnetic separator 1 through the chute 17 for preliminary sorting, and the precious metals are initially enriched in this process. The obtained rough concentrate is sent to the grinding machine 3 for grinding through the rough concentrate screw conveyor 2, and the roughing tailings flow into the scavenging magnetic separator 10 by gravity to further recover the precious metals.
[0013] The discharge of the grinding mill 3 flows into the coarse concentrate pump pool 4. Under the action of the slurry agitator 5, the coarse concentrate slurry pump 6 is fed to the concentrating magnetic separator 7 to further enrich the precious metals to obtain high-grade alloys, and then transported to the high-grade alloy bin 9 for storage by the high-grade alloy screw conveyor 8. The concentrate of the scavenging magnetic separator 10 and the tailings of the concentrating magnetic separator 7 are combined and sent to the medium ore re-selection magnetic separator 11 to recover the precious metals again. The obtained low-grade alloy is sent to the low-grade alloy bin 13 for storage by the low-grade alloy screw conveyor 12. The tailings of the scavenging magnetic separator 10 and the tailings of the medium ore re-selection magnetic separator 11 flow into the tailings pump pool 14 as the final tailings, and are transported back to the second-stage grinding mill 16 by the tailings slurry pump 15.
[0014] The sand returned from the second stage classification is used as the roughing feed, and its material particle size is -200 mesh, accounting for 45%, the precious metal grade is 130-140g / t, and the sulfur content is 18%. The grinding concentration of the coarse concentrate is 60-70%, and the grinding fineness is -200 mesh, accounting for 60%. The yield of high-grade alloy relative to the roughing feed is 28%, the material particle size is -200 mesh, accounting for 52%, the precious metal grade is 335-345g / t, and the sulfur content is ≤10%. The yield of low-grade alloy relative to the roughing feed is 9%, the material particle size is -200 mesh, accounting for 56%, the precious metal grade is 100-105g / t, and the sulfur content is ≤12%. The total yield of the two precious metal products, high-grade alloy and low-grade alloy, relative to the roughing feed is 37%, and the precious metal recovery rate can reach 77%. The final tailings yield relative to the roughing feed is 63%, the material particle size is -200 mesh accounting for 62%, the precious metal grade is 45-50g / t, and the sulfur content is ≤23%.
[0015] Efficient extraction of coarse alloy particles in the grinding circuit can, on the one hand, reduce the amount of precious metal particles entering the flotation operation and improve the adverse effects of dispersion loss of precious metal minerals in the beneficiation process; on the other hand, it can reduce the precious metal content in nickel and copper concentrates, improve the quality of concentrate products, and provide favorable conditions for subsequent smelting and purification and impurity removal processes.
[0016] Compared with the original process, the coarse-grained alloy recovery process adopted by the present invention adds coarse-fine regrinding, concentration, scavenging and middling reselection operations. The regrinding of coarse concentrate can effectively improve the dissociation degree of nickel-iron alloy monomers, reduce the content of intergrowths, create better process conditions for the efficient recovery of alloys, and further improve the recovery rate of precious metals. The concentration operation can further improve the precious metal grade of coarse-grained alloys and provide high-quality raw materials for downstream processes. The scavenging operation can deeply extract precious metal components from the rough 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 reselection operation conducts targeted recovery of the residual precious metal minerals that are difficult to recover in the selected tailings and scavenged concentrates, and further improves the recovery rate of precious metals. The reselected concentrate can be sold as a coarse-grained alloy product with a lower grade.
[0017] The production system of the present invention can produce both high-grade alloys and low-grade alloys at the same time, and can meet the raw material requirements of different customers and different processes.
[0018] Compared with the existing system, the production system of the present invention increases the yield of coarse-grained alloy relative to the second-stage classification return sand by 9 to 11 percentage points, and the recovery rate of precious metals increases by 17 percentage points. Under the premise of ensuring the steady increase of the yield of coarse-grained alloy and the recovery rate of precious metals, the quality of coarse-grained alloy products has also been greatly improved, and the precious metal grade can be increased from 260g / t of the existing system to a maximum of 335 to 345g / t, truly achieving efficient recovery of precious metals and effectively controlling the dispersion of precious metals.
[0019] The coarse concentrate pump pool 4 and the tailings pump pool 14 are both circular pump pools. The circular pump pools have good fluid mechanics characteristics. Compared with the rectangular pump pools, the slurry fluidity is good and dead zones are not easily formed.
[0020] 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 pool 4 to keep the alloy mineral particles in a suspended state all the time, effectively preventing the alloy particles from being deposited and crushed.
Claims
1. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit, characterized in that: The production process includes a production system, which includes a roughing magnetic separator (1), a coarse concentrate screw conveyor (2), a grinding mill (3), a coarse concentrate pump pool (4), a slurry agitator (5), a coarse concentrate slurry pump (6), a fine 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 pool (14), a tailings slurry pump (15), a second-stage grinding mill (16), and a chute (17); the connection and feeding methods of the various components are as follows: The secondary classification return sand is connected to a 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 a roughing concentrate screw conveyor (2), and the discharge end of the roughing concentrate screw conveyor (2) is connected to a grinding mill (3); the tailings discharge end of the roughing magnetic separator (1) is connected to a 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) via 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 connected to the intermediate ore re-selection magnetic separator (11), and the intermediate ore re-selection magnetic separator (11) is used to recover precious metals again; the concentrate discharge end of the intermediate ore re-selection 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 flow, and the tailings pump pool (14) is connected to the secondary grinding mill (16) via the tailings slurry pump (15); The production process is as follows: the sand returned from the second stage classification is fed into a roughing magnetic separator (1) through a chute (17) for preliminary sorting, and the precious metals are initially enriched in this process. The obtained rough concentrate is fed into a grinding machine (3) through a rough concentrate screw conveyor (2) for grinding, and the rough tailings flow by gravity into a scavenging magnetic separator (10) for further recovery of precious metals. The ore discharged from the grinding mill (3) flows into the coarse concentrate pump pool (4), and under the action of the slurry agitator (5), is fed into the fine magnetic separator (7) through the coarse concentrate slurry pump (6) to further enrich the precious metals to obtain high-grade alloys, and then is transported to the high-grade alloy bin (9) for storage by the high-grade alloy screw conveyor (8); the concentrate from the scavenging magnetic separator (10) and the tailings from the fine magnetic separator (7) are combined and enter the medium ore re-selection magnetic separator (11) to recover the precious metals again, and the obtained low-grade alloy is sent to the low-grade alloy bin (13) for storage by the low-grade alloy screw conveyor (12); the tailings from the scavenging magnetic separator (10) and the tailings from the medium ore re-selection magnetic separator (11) as the final tailings flow by gravity into the tailings pump pool (14), and are transported back to the secondary grinding mill (16) by the tailings slurry pump (15).
2. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit according to claim 1, characterized in that: The sand returned from the second stage classification is used as the roughing feed, with a material particle size of -200 mesh accounting for 45%, a precious metal grade of 130-140g / t, and a sulfur content of 18%.
3. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit according to claim 2, characterized in that: The grinding concentration of coarse concentrate is 60-70%, and the grinding fineness is -200 mesh accounting for 60%.
4. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit according to claim 3, characterized in that: The yield of high-grade alloy relative to roughing feed is 28%, the material particle size is -200 mesh accounting for 52%, the precious metal grade is 335-345g / t, and the sulfur content is ≤10%.
5. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit according to claim 4, characterized in that: The yield of low-grade alloy relative to roughing feed is 9%, the material particle size is -200 mesh accounting for 56%, the precious metal grade is 100-105g / t, and the sulfur content is ≤12%.
6. A production process for extracting coarse-grained alloy from a high-nickel matte grinding circuit according to claim 5, characterized in that: The yield of the two precious metal products, high-grade alloy and low-grade alloy, relative to the roughing feed is 37% in total, and the precious metal recovery rate can reach 77%; the yield of the final tailings relative to the roughing feed is 63%, the material particle size is -200 mesh accounting for 62%, the precious metal grade is 45-50g / t, and the sulfur content is ≤23%.