Fluorite beneficiation process for Baiyunebo mine

Abstract

The application discloses a fluorite beneficiation process for Baiyunebo mine, adopts a closed-circuit grinding process, three-stage flotation process, and a combination of positive flotation and magnetic separation, and finally produces qualified fluorite concentrate, fluorite sub-concentrate and tailings; the fluorite beneficiation process realizes efficient recovery of fluorite in Baiyunebo mine, and has great significance for secondary resource utilization of Baiyunebo tailings and environmental protection around the tailings pond.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a process for beneficiating fluorite from the Bayan Obo mine. Background Technology

[0002] In 2011, the project "Research on Key Technologies for Comprehensive Utilization of Rare Earth Niobium Resources in Baotou" was included in the National Science and Technology Support Program. This project achieved key technologies and ideal indicators in the comprehensive utilization of fluorite and niobium resources. In 2011, the project "Research on Fluorite Resources in Baogang Tailings and Development of Fluorochemical Industry Technology" obtained fluorite concentrate with a grade of 95% through small-scale trials. Anhydrous hydrogen fluoride can be obtained using this fluorite concentrate, which laid the technological foundation for fluorite beneficiation in the Bayan Obo mine.

[0003] In 2011, Baogang Group launched the "Baogang Oxide Ore Beneficiation Relocation and Baiyun Obo Mineral Resource Comprehensive Utilization Project". In addition to iron concentrate and rare earth concentrate products, this project has made fluorite beneficiation and niobium ore beneficiation new highlights, increasing the recovery of fluorite concentrate and niobium concentrate. Driven by the mature technology of the iron production line and rare earth production line, the fluorite production line is fully operational.

[0004] In early 2018, Baoshan Mining Company established a fluorite research team. Mineral processing technicians conducted extensive research on low-grade fluorite beneficiation technology, achieving numerous results that significantly advanced fluorite beneficiation techniques. These research findings were gradually applied to industrial production, providing strong data support for on-site research. The successful application of these research results enabled effective separation of fluorite from the Bayan Obo mine. Based on adjustments to flotation influencing factors, the fluorite beneficiation process was optimized to obtain high-grade fluorite concentrate. This propelled Baoshan Mining Company's comprehensive utilization of Bayan Obo mineral resources to a new level, taking a significant step towards becoming a leading national demonstration base for comprehensive resource utilization on the path of scientific development. Summary of the Invention

[0005] The purpose of this invention is to provide a fluorite beneficiation process for the Bayan Obo mine, which adopts a single-stage closed-circuit grinding, a three-stage flotation process, and a combination of direct flotation and magnetic separation to produce final qualified fluorite concentrate, fluorite secondary concentrate, and tailings. This process achieves efficient recovery of fluorite from the Bayan Obo mine and is of great significance for the secondary resource utilization of Bayan Obo tailings and the environmental protection of the surrounding tailings dam.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention discloses a fluorite beneficiation process from the Bayan Obo mine, which specifically includes the following steps:

[0008] 1) The raw ore is fed into a ball mill for primary grinding. Water is added to the ball mill at the same time as the raw ore is fed into the ball mill to fully dissociate the fluorite minerals and gangue minerals. The discharge from the ball mill is sent to a primary hydrocyclone for classification. The primary classification sediment is returned to the ball mill.

[0009] 2) The overflow product from the primary classification enters the mixed roughing and cleaning flotation. The froth product from the mixed flotation is fed into the φ50-meter fluorite roughing feed thickening well. The bottom flow from the feed thickening well is fed into the fluorite direct flotation roughing operation. The froth from the direct flotation roughing is fed into the primary direct flotation operation. The froth from the primary direct flotation is fed into the secondary direct flotation operation. The froth from the secondary direct flotation is fed into the tertiary direct flotation operation. The froth from the tertiary direct flotation is fed into the quaternary direct flotation operation. The froth from the quaternary direct flotation is fed into the quinary direct flotation operation. The froth from the quinary direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the quaternary direct flotation to the septum direct flotation is returned to the φ50-meter fluorite roughing feed thickening well.

[0010] 3) The froth product from the seventh direct flotation is fed into a 1.7T high-intensity magnetic separator for one-step removal of weakly magnetic minerals. The strong magnetic fluorite concentrate is fed into the φ20-meter thickening well of the eighth direct flotation. The bottom flow of the thickening well is fed into the eighth direct flotation operation of fluorite. The froth from the eighth direct flotation is fed into the ninth direct flotation operation. The froth from the ninth direct flotation is fed into the tenth direct flotation operation. The froth from the tenth direct flotation is fed into the eleventh direct flotation operation. The froth product from the eleventh flotation is fed into a 1.7T high-intensity magnetic separator for two-step removal of weakly magnetic minerals. The ore from the ninth to the eleventh direct flotation is returned to the φ50-meter thickening well of fluorite roughing. The ore from the eighth direct flotation and the tailings from the first-step strong magnetic fluorite are the final tailings.

[0011] 4) The two-step strong magnetic fluorite concentrate is fed into a 5T superconducting magnetic separator. The superconducting fluorite concentrate is the final fluorite concentrate product, and the superconducting fluorite tailings is the secondary fluorite concentrate product. The final fluorite concentrate product and the secondary fluorite concentrate product enter the filtration system for separation filtration.

[0012] Furthermore, in step 1), the particle size of the primary graded overflow product is -200 mesh, accounting for 94%-95%, and -325 mesh, accounting for 85%.

[0013] Furthermore, in step 1), the grinding concentration during the first grinding is 70% ± 10; the media filling rate of the ball mill is 40%-45%.

[0014] Furthermore, the reagent system for the mixed flotation in step 2) is as follows: water glass dosage 1.05 kg / t feed, SF collector dosage 0.39 kg / t feed; roughing pulp concentration 40%-45%, flotation temperature 50±5℃, pH value 8-9; fluorite roughing flotation: water glass dosage 1.14 kg / t feed, sulfuric acid dosage 1.14 kg / t feed, FY inhibitor dosage 1.48 kg / t feed, SF collector dosage 1.48 kg / t feed, roughing pulp concentration 35%-40%; fluorite primary to secondary cleaning reagent dosages: water glass dosage 0.87 kg / t feed, sulfuric acid dosage 0.87 kg / t feed, FY inhibitor dosage 1.39 kg / t feed, room temperature flotation, pH value 6-6.5.

[0015] Furthermore, in step 3), the amount of water glass used in the eight-stage flotation of fluorite is 0.48 kg / t feed, the amount of sulfuric acid used is 0.096 kg / t feed, the amount of aluminum sulfate used is 0.38 kg / t feed, the amount of tannin used is 0.18 kg / t feed, and the amount of naphthenic acid used is 0.16 kg / t feed. The pulp concentration for the eight-stage flotation is 35%-40%, the flotation is carried out at room temperature, and the pH value is 6-6.5.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0017] This invention fully considers the symbiotic relationship and intercalation characteristics of fluorite with gangue minerals such as hematite, carbonate minerals, silicate minerals, barite, pyrite, and apatite, and controls the mineral particle size to 94%-95% for -200 mesh, above 85% for -325 mesh, and above 70% for -500 mesh, thereby achieving full liberation of useful minerals.

[0018] The process employs a three-stage flotation separation method, which involves desliming and de-reagenting through three pre-selection concentration wells, thus avoiding problems such as the accumulation of flotation reagents in fluorite ore causing difficulties in separation.

[0019] Two-step 1.7T high-intensity magnetic separators were used to extract and remove weakly magnetic minerals from the froth products of the seventh and eleventh direct froth processes, laying the foundation for improving the grade of the final fluorite concentrate product.

[0020] Superconducting magnetic separators were used to improve the grade of 1.7T strong magnetic fluorite concentrate in two steps, achieving efficient recovery of fluorite minerals in the Bayan Obo mine, producing high-grade fluorite concentrate and secondary concentrate, and improving the fluorite recovery rate.

[0021] Realizing the secondary resource recovery of the Bayan Obo tailings will propel the Bayan Obo mineral resource comprehensive utilization industry to a new level, taking a significant step towards becoming the most competitive national resource comprehensive utilization demonstration base on the road of scientific development, and also having great significance for the environmental protection of the surrounding area. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a flow chart of the fluorite beneficiation process in the Bayan Obo mine of this invention. Detailed Implementation

[0024] like Figure 1 As shown, a fluorite beneficiation process from the Bayan Obo mine specifically includes the following steps:

[0025] 1) The raw ore is fed into a ball mill for primary grinding. Water is added at the same time as the raw ore is fed into the ball mill to fully dissociate the fluorite minerals and gangue minerals. The discharge from the ball mill is sent to a primary hydrocyclone for classification. The primary classification sediment is returned to the ball mill. The primary classification overflow product has a particle size of -200 mesh accounting for 94%-95% and -325 mesh accounting for 85%.

[0026] 2) The overflow product from the primary classification enters the mixed roughing and cleaning flotation. The froth product from the mixed flotation is fed into the φ50-meter thickening well for fluorite roughing. The bottom flow from the thickening well is fed into the fluorite direct flotation roughing operation. The froth from the direct flotation roughing is fed into the primary direct flotation operation. The froth from the primary direct flotation is fed into the secondary direct flotation operation. The froth from the secondary direct flotation is fed into the tertiary direct flotation operation. The froth from the tertiary direct flotation is fed into the quaternary direct flotation operation. The froth from the quaternary direct flotation is fed into the quinary direct flotation operation. The froth from the quinary direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the septum direct flotation operation. The froth from the septum direct flotation is fed into the φ50-meter thickening well for fluorite roughing.

[0027] 3) The froth product from the seventh direct flotation is fed into a 1.7T high-intensity magnetic separator for one-step removal of weakly magnetic minerals. The strong magnetic fluorite concentrate is fed into the φ20-meter thickening well of the eighth direct flotation. The bottom flow of the thickening well is fed into the eighth direct flotation operation of fluorite. The froth from the eighth direct flotation is fed into the ninth direct flotation operation. The froth from the ninth direct flotation is fed into the tenth direct flotation operation. The froth from the tenth direct flotation is fed into the eleventh direct flotation operation. The froth product from the eleventh flotation is fed into a 1.7T high-intensity magnetic separator for two-step removal of weakly magnetic minerals. The ore from the ninth to the eleventh direct flotation is returned to the φ50-meter thickening well of fluorite roughing. The ore from the eighth direct flotation and the tailings from the first-step strong magnetic fluorite are the final tailings.

[0028] 4) The two-step strong magnetic fluorite concentrate is fed into a 5T superconducting magnetic separator. The superconducting fluorite concentrate is the final fluorite concentrate product, and the superconducting fluorite tailings is the secondary fluorite concentrate product. The final fluorite concentrate product and the secondary fluorite concentrate product enter the filtration system for separation filtration.

[0029] In step 1), the grinding concentration during the first grinding is 70% ± 10; the media filling rate of the ball mill is 40%-45%.

[0030] The reagent regime for the mixed flotation in step 2) is as follows: water glass dosage 1.05 kg / t feed, SF collector dosage 0.39 kg / t feed; roughing pulp concentration 40%-45%, flotation temperature 50±5℃, pH value 8-9; fluorite roughing flotation: water glass dosage 1.14 kg / t feed, sulfuric acid dosage 1.14 kg / t feed, FY inhibitor dosage 1.48 kg / t feed, SF collector dosage 1.48 kg / t feed, roughing pulp concentration 35%-40%; fluorite primary to secondary cleaning reagent dosages: water glass dosage 0.87 kg / t feed, sulfuric acid dosage 0.87 kg / t feed, FY inhibitor dosage 1.39 kg / t feed, room temperature flotation, pH value 6-6.5.

[0031] In step 3), the eight-stage flotation of fluorite involves the following dosages: water glass 0.48 kg / t feed, sulfuric acid 0.096 kg / t feed, aluminum sulfate 0.38 kg / t feed, tannin 0.18 kg / t feed, and naphthenic acid 0.16 kg / t feed. The pulp concentration for the eight-stage flotation is 35%-40%, the flotation is performed at room temperature, and the pH value is 6-6.5.

[0032]

Example 1

[0033] In this embodiment, the fluorite beneficiation process of the Bayan Obo mine adopts a combination of closed-circuit grinding, three-stage flotation, and direct flotation and magnetic separation to obtain the final qualified fluorite concentrate, fluorite secondary concentrate and tailings after beneficiation.

[0034] Fluorite ore is separated into 200 mesh (84%) and transported through pipelines to the primary hydrocyclone feed pump pool. The primary hydrocyclone feed pump pool pumps the ore to the primary hydrocyclone for classification. The primary hydrocyclone underflow is fed into a first-stage ball mill. The primary hydrocyclone and the first-stage ball mill form a closed-circuit grinding system.

[0035] The grinding concentration in a single ball mill is 75% ± 10, which means the mass ratio of raw ore to (raw ore + water) is 75% ± 10.

[0036] The ball media filling rate of the primary ball mill is 40%.

[0037] The overflow from the primary hydrocyclone, at a concentration of 94%-95% (200 mesh), is fed into the φ60-meter thickening well before mixed flotation. The bottom flow from the φ60-meter thickening well is pumped to the roughing operation of the mixed positive flotation. The feed concentration is 45%, the flotation temperature is 53℃, and the pH value is 8.5. The froth product from the positive flotation roughing operation enters the primary positive flotation operation. The froth product from the primary positive flotation is fed into the φ50-meter thickening well before fluorite flotation. The tailings from the mixed roughing operation enter another comprehensive resource recovery production line. The ore from the primary flotation operation is returned in a closed loop to the feed well before mixed flotation. The reagent system for the mixed positive flotation roughing operation is as follows: water glass dosage 1.05 kg / t feed, SF collector dosage 0.39 kg / t feed.

[0038] Before flotation, fluorite is concentrated in a 50-meter deep well and pumped to the fluorite direct flotation roughing operation. The feed concentration is 40%, the flotation temperature is ambient, and the pH is 6.5. The roughing flotation foam is fed into the first direct flotation operation, the first direct flotation foam into the second direct flotation operation, the second direct flotation foam into the third direct flotation operation, the third direct flotation foam into the fourth direct flotation operation, the fourth direct flotation foam into the fifth direct flotation operation, the fifth direct flotation foam into the sixth direct flotation operation, and the sixth direct flotation foam into the seventh direct flotation operation. The roughing tailings and the ore from the first direct flotation operation are the final tailings. The concentrate from the first to the seventh stage of direct flotation is returned to the φ50-meter fluorite rougher feed concentration well. The reagent system for the fluorite direct flotation rougher is as follows: water glass 1.14 kg / t feed, sulfuric acid 1.14 kg / t feed, FY inhibitor 1.48 kg / t feed, SF collector 1.48 kg / t feed, and the rougher pulp concentration is 35%-40%. The reagent dosages for the first to seventh stages of fluorite cleaning are: water glass 0.87 kg / t feed, sulfuric acid 0.87 kg / t feed, and FY inhibitor 1.39 kg / t feed.

[0039] The froth product from the seventh direct flotation stage is fed into a 1.7T high-intensity magnetic separator for one-step removal of weakly magnetic minerals. The high-intensity magnetic fluorite concentrate is fed into the φ20-meter thickening well of the eighth direct flotation stage. The feed concentration is 39%, the flotation temperature is ambient, and the pH value is 6.5. The froth from the eighth direct flotation stage is fed into the ninth direct flotation stage, and the froth from the ninth direct flotation stage is fed into the tenth direct flotation stage. The froth is fed into the eleventh direct flotation operation, and the froth product from the eleventh flotation is fed into a 1.7T high-intensity magnetic separator for two-step removal of weakly magnetic minerals; the reagent system for the eight direct flotation operations of fluorite is as follows: water glass dosage 0.48 kg / t feed, sulfuric acid dosage 0.096 kg / t feed, aluminum sulfate dosage 0.38 kg / t feed, tannin dosage 0.18 kg / t feed, and naphthenic acid dosage 0.16 kg / t feed.

[0040] The ore from the ninth to eleventh direct flotation flotation is concentrated and returned to the φ50-meter fluorite roughing feed concentration well. The ore from the eighth direct flotation ...

[0041] The two-step strong magnetic fluorite concentrate is fed into a 5T superconducting magnetic separator. The superconducting fluorite concentrate is the final fluorite concentrate product, and the superconducting fluorite tailings are the secondary fluorite concentrate product. The final fluorite concentrate product and the secondary fluorite concentrate product enter the filtration system for separation filtration.

[0042] In this embodiment, a closed-circuit grinding process, a three-stage flotation process, and a combination of direct flotation and magnetic separation are employed. After separation, the final qualified fluorite concentrate, fluorite secondary concentrate, and a comprehensive tailings consisting of fluorite direct flotation rougher tailings, primary direct flotation concentrate, one-step 1.7T strong magnetic tailings, and eight primary flotation concentrates are obtained. The recovery of fluorite secondary concentrate significantly improves the recovery rate of fluorite ore. After the application of the new process, the production of fluorite concentrate exceeded 10,000 tons / month, the grade of fluorite concentrate increased from 85.02% to 90.32%, and the output of fluorite concentrate increased from 400 tons / day before the implementation of the new process to 406 tons / day, an increase of 4-6 tons / day.

[0043] Comparison of production indicators before and after the implementation of the new process

[0044]

[0045]

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A beneficiation process for fluorite from the Bayan Obo mine, characterized in that: Specifically, the steps include the following: The process involves a closed-circuit grinding process, a three-stage flotation process, and a combination of direct flotation and magnetic separation. After separation, the final qualified fluorite concentrate, fluorite secondary concentrate, and tailings are obtained. Selecting fluorite from raw ore 200 mesh 84% is transported through pipeline to the primary hydrocyclone feed pump pool, and pumped to the primary hydrocyclone for classification. The primary hydrocyclone underflow is fed into a first-stage ball mill. The primary hydrocyclone and the first-stage ball mill form a closed-circuit grinding system. The fluorite beneficiation raw ore is a rare tailings. The grinding concentration in the first-stage ball mill is 75% ± 10, and the ball media filling rate of the first-stage ball mill is 40%. Primary hydrocyclone overflow 200 mesh 94% 95% is fed into the Φ60-meter thickening well before mixed flotation. The bottom flow pump from the Φ60-meter thickening well before mixed flotation is sent to the mixed positive flotation roughing operation. The feed concentration is 45%, the flotation temperature is 53℃, and the pH value is 8.

5. The froth product from the positive flotation roughing operation enters the mixed primary positive flotation operation. The froth product from the mixed primary positive flotation is fed into the Φ50-meter thickening well before fluorite flotation. The tailings from the mixed roughing operation enter another resource recovery production line. The ore from the mixed primary flotation is returned to the feed well before mixed flotation in a closed loop. The reagent system for the mixed positive flotation roughing operation is: water glass dosage 1.05Kg / t feed, SF collector dosage 0.39Kg / t feed. Before flotation, fluorite is concentrated in a 50-meter deep well and pumped to the fluorite roughing operation via a bottom-flow pump. The feed concentration is 40%, the flotation temperature is ambient, and the pH is 6.

5. The roughing flotation foam is fed into the first stage of the direct flotation process, then into the second stage, then into the third stage, then into the fourth, fifth, and finally into the sixth stage. The flotation process involves seven stages of direct flotation (DFF) with froth feed. The rougher tailings and the ore from the first DFF are the final tailings. The ore from the second DFF to the seventh DFF is collected and returned to the Φ50-meter fluorite rougher feed concentration well. The fluorite DFF rougher reagent regimen is as follows: water glass 1.14 kg / t feed, sulfuric acid 1.14 kg / t feed, FY depressant 1.48 kg / t feed, SF collector 1.48 kg / t feed, and the rougher pulp concentration is 35%. 40%, the dosage of reagents for the first to seventh beneficiation of fluorite is 0.87 kg / t feed of water glass, 0.87 kg / t feed of sulfuric acid, and 1.39 kg / t feed of FY inhibitor; The froth product from the seventh direct flotation stage is fed into a 1.7T high-intensity magnetic separator for one-step removal of weakly magnetic minerals. The high-intensity magnetic fluorite concentrate is fed into the Φ20-meter thickening well of the eighth direct flotation stage. The feed concentration is 39%, the flotation temperature is ambient, and the pH value is 6.

5. The froth from the eighth direct flotation stage is fed into the ninth direct flotation stage, and the froth from the ninth direct flotation stage is fed into the tenth direct flotation stage. The flotation foam is fed into the eleventh direct flotation operation, and the flotation foam product from the eleventh flotation is fed into a 1.7T high-intensity magnetic separator for two-step removal of weakly magnetic minerals; the reagent system for the eight direct flotation operations of fluorite is as follows: water glass dosage 0.48 kg / t feed, sulfuric acid dosage 0.096 kg / t feed, aluminum sulfate dosage 0.38 kg / t feed, tannin dosage 0.18 kg / t feed, and naphthenic acid dosage 0.16 kg / t feed. The ore from the ninth to eleventh direct flotation is concentrated and returned to the Φ50-meter fluorite roughing feed concentration well. The ore from the eighth direct flotation and the tailings from the first step of strong magnetic fluorite are the final tailings. The two-step strong magnetic fluorite concentrate is fed into a 5T superconducting magnetic separator. The superconducting fluorite concentrate is the final fluorite concentrate product, and the superconducting fluorite tailings are the secondary fluorite concentrate product. The final fluorite concentrate product and the secondary fluorite concentrate product enter the filtration system for separation filtration.

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