A mineral processing method for regrinding and flotation of fluorite tailings from multi-linked associated fluorite deposits.

Abstract

This invention provides a beneficiation method for refractory flotation of fluorite tailings from multi-linked associated fluorite deposits, relating to the field of metallic and non-metallic mineral flotation. The method includes the following steps: S1, ore sample preparation; S2, concentration operation; S3, classification operation, with the graded sediment having a concentration of approximately 50-60% entering an abrasive mill for refractory grinding; S4, strong magnetic flotation operation; S5, fluorite roughing; and S6, fluorite refining. By using refractory-enhanced magnetic flotation technology for the recovery of fluorite tailings, the incoming ore sample undergoes further liberation and friction, generating numerous new liberation surfaces for the mineral particles. The strong magnetic field also effectively separates weakly magnetic gangue minerals. Furthermore, the use of calcium carbonate inhibitors in the roughing process to suppress calcium carbonate and multiple open-circuit discharges of calcium carbonate reduces the pressure on subsequent operations by lowering the calcium carbonate content, resulting in excellent separation performance.

Description

Technical Field

[0001] This invention relates to the field of flotation technology for metallic and non-metallic minerals, specifically to a mineral processing method for re-grinding and flotation of fluorite tailings from multi-linked associated fluorite deposits. Background Technology

[0002] Fluorite, also known as fluorspar, is a strategic non-metallic mineral resource with wide applications in traditional industries and increasingly important applications in high-tech industries. The Shizhuyuan polymetallic mine is a typical associated fluorite deposit. Before recovering the associated fluorite, molybdenum-bismuth sulfide ore and tungsten ore must be recovered first. Therefore, factors such as flotation concentration, grinding fineness, and pH value in the separation process need to be comprehensively considered, meaning that the current fluorite separation conditions may not be optimal.

[0003] Flotation is a widely used mineral processing method in mineral processing. It involves flotating solid minerals from a suspension (slurry) in water based on differences in the physical and chemical properties of the mineral surface. Flotation is widely used in the mineral processing industry and is best suited for separating disseminated ores with low grades and fine particles. Before flotation, the ore must be ground to the particle size required for flotation, ensuring that the valuable minerals are essentially liberated for separation. Flotation reagents are also added. During flotation, air is introduced into the slurry, forming a large number of bubbles. Particles that are not easily wetted by water, commonly known as hydrophobic minerals, adhere to the bubbles and rise to the surface of the slurry, forming a mineralized froth layer. Particles that are easily wetted by water, commonly known as hydrophilic minerals, do not adhere to the bubbles and remain in the slurry. The mineralized froth is then removed, achieving the separation purpose.

[0004] The characteristics of fluorite tailings obtained by flotation include: poor liberation of individual particles, many intergrowths, uneven particle size distribution with more particles at both ends and less in the middle, and the adverse effects of a large amount of residual reagents from the previous flotation stage. As a result, the direct reflotation performance of fluorite tailings is not ideal. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a beneficiation method for refractory flotation of fluorite tailings from multi-linked associated fluorite deposits. This method solves the problem that existing flotation-obtained fluorite tailings have many deficiencies, leading to unsatisfactory reflotation results from direct refractory flotation of fluorite tailings.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides a mineral processing method for regrinding and flotation of fluorite tailings from multi-linked associated fluorite deposits, comprising the following steps:

[0009] S1. Mineral sample preparation;

[0010] S2, Concentration Operation;

[0011] S3. Grading process: The graded sand with a concentration of about 50-60% is then ground again in the sand mill.

[0012] S4, Strong magnetic field operation;

[0013] S5. Fluorite roughing: Non-magnetic separation products are sequentially treated with sodium carbonate 1-3 kg / t, water glass 0.5-1.5 kg / t, calcium carbonate inhibitor 80-250 g / t, and fluorite collector 100-300 g / t to adjust the slurry for fluorite roughing, to obtain fluorite roughing concentrate and fluorite roughing tailings.

[0014] S6, Fluorite Selection;

[0015] The use of regrinding and enhanced magnetic flotation technology for the recovery of tailings from fluorite beneficiation has enabled the re-dissociation and friction of the feed ore sample.

[0016] Preferably, the ore sample in S1 is derived from the tailings of fluorite beneficiation associated with a metal beneficiation plant, with a concentration of 8-15%, a fineness of -0.074mm content of 65-72%, a fluorite grade of 20-35%, and a calcium carbonate grade of 8-15%.

[0017] Preferably, the specific steps of the concentration operation are to concentrate the ore sample obtained in S1 in a concentration tank or inclined plate thickening box to obtain an underflow concentration of 30-40%.

[0018] Preferably, the specific steps of the grading operation are as follows: the underflow obtained in S2 is graded using a hydrocyclone, and the graded sediment concentration of about 50-60% is then fed into an abrasive mill for further grinding.

[0019] Preferably, in the grading process, during the regrinding of the sand mill, the regrinded product is combined with the concentrated underflow and enters the hydrocyclone for grading. The overflow product has a concentration of 30-40% and a fineness of -0.074mm content of 80-90%. The underflow is returned in a closed loop.

[0020] Preferably, the strong magnetic separation process is as follows: the overflow product obtained in S3 is subjected to strong magnetic separation to extract the magnetic gangue minerals.

[0021] Preferably, in S4, a 1T strong magnetizer is used to strongly magnetize the overflow product.

[0022] Preferably, in S1, the fluorite grain size distribution is uneven, with more at both ends and less in the middle, and the gangue minerals are mainly garnet, calcite, common pyroxene, feldspar, etc.

[0023] Preferably, the fluorite rough concentrate obtained in step S5 is subjected to four fine-tuning processes to obtain the final fluorite concentrate. 0-300 g / t of acidified water glass and 0-600 g / t of hydrochloric acid are added to concentrates 1 to 4 respectively. The medium ore from concentrate 1 is discharged, the medium ore from concentrate 2 is returned to concentrate 1, the medium ore from concentrate 3 is returned to concentrate 2, and the medium ore from concentrate 4 is returned to concentrate 3.

[0024] Preferably, in S4, a semi-countercurrent magnetic separator is used for strong magnetic separation. The specific steps are as follows: the ore slurry is fed into the separation space from below the tank in a loose suspended state. The direction of slurry movement is basically the same as the direction of magnetic force. The ore particles reach the cylindrical surface where the magnetic force is very high. The tailings are discharged from the tailings hole on the bottom plate so that the overflow surface can maintain the slurry level in the tank.

[0025] (III) Beneficial Effects

[0026] This invention provides a mineral processing method for regrinding and flotation of fluorite in tailings from multi-linked associated fluorite deposits. It has the following beneficial effects:

[0027] This invention employs a grading process. The graded sand with a concentration of approximately 50-60% is then regrinded in an abrasive mill. The regrinded product is combined with the concentrated underflow and regrinded in a hydrocyclone for further grading. The overflow product undergoes strong magnetic separation to remove magnetic gangue minerals. The non-magnetically separated product is then mixed with modifiers, inhibitors, and collectors to prepare the slurry for fluorite roughing, resulting in fluorite roughing concentrate and fluorite roughing tailings. The regrinding, combined with strong magnetic flotation technology, is used for the recovery of fluorite tailings. This process achieves further liberation and friction of the incoming ore sample, generating numerous new liberation surfaces for the mineral particles. The strong magnetic field also effectively separates weakly magnetic gangue minerals. Furthermore, the use of calcium carbonate inhibitors in the roughing process suppresses calcium carbonate, and multiple open-circuit discharges reduce the calcium carbonate content and alleviate pressure in subsequent operations, resulting in excellent separation performance. Attached Figure Description

[0028] Figure 1 The flowchart of the fluorite beneficiation process for refractory tailings regrinding and magnetic flotation of fluorite, as proposed in this invention, is shown in the figure. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] like Figure 1As shown in the figure, this embodiment of the invention provides a mineral processing method for refractory flotation of tailings from multi-linked associated fluorite deposits, comprising the following steps:

[0032] S1. Mineral sample preparation;

[0033] S2, Concentration Operation;

[0034] S3. Grading process: The graded sand with a concentration of about 50-60% is then ground again in the sand mill.

[0035] S4, Strong magnetic field operation;

[0036] S5. Fluorite roughing: Non-magnetic separation products are sequentially treated with sodium carbonate 1-3 kg / t, water glass 0.5-1.5 kg / t, calcium carbonate inhibitor 80-250 g / t, and fluorite collector 100-300 g / t to adjust the slurry for fluorite roughing, to obtain fluorite roughing concentrate and fluorite roughing tailings.

[0037] S6. Fluorite Refinement: The fluorite rough concentrate obtained in step S5 is refined four times to obtain the final fluorite concentrate. 0-300g / t of acidified water glass and 0-600g / t of hydrochloric acid are added to refinements 1 to 4 respectively. The ore in refinement 1 is sent out, the ore in refinement 2 is returned to refinement 1, the ore in refinement 3 is returned to refinement 2, and the ore in refinement 4 is returned to refinement 3.

[0038] The ore sample in S1 was derived from the tailings of fluorite beneficiation associated with a metal beneficiation plant. The concentration was 8-15%, the fineness (-0.074mm) content was 65-72%, the fluorite grade was 20-35%, and the calcium carbonate grade was 8-15%.

[0039] The specific steps of the concentration operation are to concentrate the ore sample obtained from S1 in a concentration tank or inclined plate thickener to obtain an underflow concentration of 30-40%.

[0040] The specific steps of the classification operation are as follows: the underflow obtained from S2 is classified using a hydrocyclone, and the sediment concentration of the classified sediment is about 50-60%, which is then further ground in an abrasive mill.

[0041] In the grading process, during the regrinding of the sand mill, the regrinded product is combined with the concentrated underflow and enters the hydrocyclone for grading. The overflow product has a concentration of 30-40% and a fineness of -0.074mm content of 80-90%. The underflow is returned in a closed loop.

[0042] The strong magnetic separation process is as follows: the overflow product obtained from S3 is subjected to strong magnetic separation to extract the magnetic gangue minerals.

[0043] In S4, a 1T strong magnetizer is used to strongly magnetize the overflow product.

[0044] In S1, the fluorite grain size distribution is uneven, with more at both ends and less in the middle. The gangue minerals are mainly garnet, calcite, common pyroxene, feldspar, etc.

[0045] In S4, a semi-countercurrent magnetic separator is used for strong magnetic separation. The specific steps are as follows: the ore slurry is fed into the separation space from below the tank in a loose and suspended state. The direction of slurry movement is basically the same as the direction of magnetic force. The ore particles reach the cylindrical surface where the magnetic force is very high. The tailings are discharged from the tailings hole on the bottom plate so that the overflow surface can maintain the slurry level in the tank.

[0046] The specific working principle is as follows:

[0047] Prepare tailings containing associated fluorite with a concentration of 8-15%, a fineness of -0.074mm of 65-72%, a fluorite grade of 20-35%, and a calcium carbonate grade of 8-15%.

[0048] The obtained ore sample is concentrated in a thickening tank or inclined plate thickening box to obtain an underflow concentration of 30-40%. The underflow is then classified using a hydrocyclone. The concentration of the classified underflow sand is about 50-60%, which is then regrinded in an abrasive mill. The regrinded product is combined with the concentrated underflow and re-classified in a hydrocyclone. The overflow product has a concentration of 30-40% and a fineness of -0.074mm content of 80-90%. The underflow sand is returned in a closed loop. The overflow product is then subjected to strong magnetic separation to remove magnetic gangue minerals. The non-magnetically separated product is then adjusted by adding sodium carbonate 1-3 kg / t, water glass 0.5-1.5 kg / t, calcium carbonate inhibitor 80-250 g / t, and fluorite collector 100-300 g / t to the slurry for fluorite roughing to obtain fluorite roughing concentrate and fluorite roughing tailings.

[0049] The obtained fluorite roughing concentrate was subjected to four fine-tuning processes to obtain the final fluorite concentrate. For concentrates 1 to 4, 0-300 g / t of acidified water glass and 0-600 g / t of hydrochloric acid were added respectively. The middlings from concentrate 1 were discharged, the middlings from concentrate 2 were returned to concentrate 1, the middlings from concentrate 3 were returned to concentrate 2, and the middlings from concentrate 4 were returned to concentrate 3. By using regrinding + strong magnetic flux + flotation technology for the recovery of fluorite tailings, the input ore sample underwent further liberation and friction, generating many new liberation surfaces for the mineral particles. The strong magnetic flux also had a good separation effect on weakly magnetic gangue minerals. Furthermore, the use of calcium carbonate inhibitors in the roughing process to suppress calcium carbonate and the multiple open-circuit discharge of calcium carbonate reduced the pressure on subsequent operations by lowering the calcium carbonate content.

[0050] Example 2:

[0051] Based on the mineral processing method for regrinding and flotation of fluorite tailings from multi-linked associated fluorite deposits provided in the first embodiment of this application, the second embodiment of this application proposes another mineral processing method for regrinding and flotation of fluorite tailings from multi-linked associated fluorite deposits. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0052] Specifically, the difference between the beneficiation method for refractory tailings and fluorite regrinding and flotation provided in the second embodiment of this application is that:

[0053] Fluorite tailings were further processed to obtain fluorite with a grade of 24.17%. The particle size distribution was uneven, with more fluorite at both ends and less in the middle. Gangue minerals mainly included garnet, calcite, pyroxene, and feldspar. The obtained fluorite tailings were concentrated in a thickener. The concentrated 32.1% underflow slurry was fed into a hydrocyclone for pre-classification and then into an abrasive mill for regrinding. The regrinded products were combined and fed into a thickener underflow hydrocyclone for classification, resulting in an overflow product with a concentration of 35.25% and a fineness of 82.5%. The overflow product was then subjected to strong magnetic separation in a 1T magnetic field separator using a semi-countercurrent magnetic separator. The specific steps are as follows: the ore slurry, in a loose suspended state, enters the separation space from below the tank, with the slurry movement direction basically the same as the magnetic field direction. The mineral particles reach the surface of the cylinder where the magnetic force is very high. The tailings are discharged from the tailings holes on the bottom plate so that the overflow level can maintain the slurry level in the tank. The obtained non-magnetic product is subjected to slurry flotation. Sodium carbonate 1.8 kg / t, water glass 1 kg / t, carbonic acid inhibitor DF-06 180 g / t, and collector CYP 200 g / t are added sequentially for roughing to obtain roughing tailings and roughing concentrate. The roughing concentrate is then subjected to fine cleaning. For concentrate 1, acidified water glass 200 g / t and hydrochloric acid 400 g / t are added. For concentrate 2, acidified water glass 100 g / t and hydrochloric acid 200 g / t are added. For concentrate 3, acidified water glass 50 g / t and hydrochloric acid 100 g / t are added. The middlings of concentrate 1 and the roughing tailings are discharged together. The middlings of concentrate 2 are returned to concentrate 1, and the middlings of concentrate 3 are returned to concentrate 2.

[0054] The results of the mineral processing tests are shown in the table below. (Flotation test parameters (wt%))

[0055] Magnetic product 30.21 20.25 25.31 Fluorspar concentrate 14.56 86.54 52.13 Tails 55.23 9.87 22.55 Fluorspar concentrate tails Fluorspar concentrate tails 100 24.17 100

[0056] Example 3:

[0057] Based on the mineral processing method for refractory flotation of fluorite tailings from multi-linked associated fluorite formations provided in the first embodiment of this application, the third embodiment of this application proposes another mineral processing method for refractory flotation of fluorite tailings from multi-linked associated fluorite formations. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0058] Specifically, the beneficiation method for refractory tailings of multi-linked associated fluorite provided in the third embodiment of this application differs in that:

[0059] Fluorite tailings were further processed to obtain fluorite with a grade of 26.25%. The particle size distribution was uneven, with more fluorite at both ends and less in the middle. Gangue minerals mainly included garnet, calcite, pyroxene, and feldspar. The obtained fluorite tailings were concentrated in a thickener. The concentrated slurry with a concentration of 35.12% was fed into a hydrocyclone for pre-classification and then into an abrasive mill for regrinding. The regrinded products were combined and fed into a thickener underflow hydrocyclone for classification, resulting in an overflow product with a concentration of 37.63% and a fineness of 83.55%. The overflow product was then subjected to strong magnetic separation in a 1T magnetic field separator using a semi-countercurrent magnetic separator. The specific steps are as follows: the ore slurry was fed into the separation space from below the tank in a loose, suspended state, with the slurry movement direction basically the same as the magnetic field direction. The mineral particles reach the surface of the cylinder where the magnetic force is very high. The tailings are discharged from the tailings holes on the bottom plate so that the overflow level can maintain the slurry level in the tank. The obtained non-magnetic product is subjected to slurry flotation. Sodium carbonate 2.1 kg / t, water glass 1.2 kg / t, carbonic acid inhibitor DF-06 200 g / t, and collector CYP 230 g / t are added sequentially for roughing to obtain roughing tailings and roughing concentrate. The roughing concentrate is then subjected to cleaning. For concentrate 1, acidified water glass 220 g / t and hydrochloric acid 510 g / t are added. For concentrate 2, acidified water glass 130 g / t and hydrochloric acid 210 g / t are added. For concentrate 3, acidified water glass 60 g / t and hydrochloric acid 110 g / t are added. The middlings of concentrate 1 and the rough tailings are discharged together. The middlings of concentrate 2 are returned to concentrate 1, and the middlings of concentrate 3 are returned to concentrate 2.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mineral processing method for regrinding and flotation of fluorite in tailings from multi-linked associated fluorite deposits, characterized in that, Includes the following steps: S1. Mineral sample preparation; S2, Concentration Operation; S3. Grading process: The graded sand with a concentration of about 50-60% is then ground again in the sand mill. S4, Strong magnetic field operation; S5. Fluorite roughing: Non-magnetic separation products are sequentially treated with sodium carbonate 1-3 kg / t, water glass 0.5-1.5 kg / t, calcium carbonate inhibitor 80-250 g / t, and fluorite collector 100-300 g / t to adjust the slurry for fluorite roughing, to obtain fluorite roughing concentrate and fluorite roughing tailings. S6, Fluorite Selection; Among them, regrinding achieves the re-dissociation and friction of the feed ore sample, strong magnetization achieves the separation of weakly magnetic gangue minerals, and calcium carbonate inhibitor + multiple open-circuit calcium carbonate discharge has a synergistic effect in the flotation of fluorite in the tailings. The specific steps of the classification operation are as follows: the underflow obtained from S2 is classified using a hydrocyclone, and the sediment concentration of the classified sediment is about 50-60% before being re-grinded in an abrasive mill. In the grading process, during the regrinding of the sand mill, the regrinded product is combined with the concentrated underflow and enters the hydrocyclone for grading. The overflow product has a concentration of 30-40% and a fineness of -0.074mm content of 80-90%. The underflow is returned in a closed loop. The fluorite rough concentrate obtained in step S5 is subjected to four fine-tuning processes to obtain the final fluorite concentrate. 0-300g / t of acidified water glass and 0-600g / t of hydrochloric acid are added to concentrates 1 to 4 respectively. The ore in concentrate 1 is discharged, the ore in concentrate 2 is returned to concentrate 1, the ore in concentrate 3 is returned to concentrate 2, and the ore in concentrate 4 is returned to concentrate 3.

2. The beneficiation method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: The ore sample in S1 was derived from the tailings of fluorite beneficiation associated with a metal beneficiation plant. The concentration was 8-15%, the fineness (-0.074mm) content was 65-72%, the fluorite grade was 20-35%, and the calcium carbonate grade was 8-15%.

3. The beneficiation method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: The specific steps of the concentration operation are to concentrate the ore sample obtained from S1 in a concentration tank or inclined plate thickener to obtain an underflow concentration of 30-40%.

4. The mineral processing method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: The strong magnetic separation process is as follows: the overflow product obtained from S3 is subjected to strong magnetic separation to extract the magnetic gangue minerals.

5. The beneficiation method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: In S4, a 1T strong magnetizer is used to strongly magnetize the overflow product.

6. The mineral processing method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: In S1, the fluorite grain size distribution is uneven, with more at both ends and less in the middle. The gangue minerals are mainly garnet, calcite, common pyroxene, feldspar, etc.

7. The beneficiation method for refractory flotation of tailings from multi-linked associated fluorite deposits according to claim 1, characterized in that: In S4, a semi-countercurrent magnetic separator is used for strong magnetic separation. The specific steps are as follows: the ore slurry is fed into the separation space from below the tank in a loose and suspended state. The direction of slurry movement is basically the same as the direction of magnetic force. The ore particles reach the cylindrical surface where the magnetic force is very high. The tailings are discharged from the tailings hole on the bottom plate so that the overflow surface can maintain the slurry level in the tank.

Images