A high-efficiency beneficiation method for niobium ore

Abstract

The present invention discloses an efficient beneficiation method for niobium ore, belonging to the technical field of beneficiation. The niobium ore is crushed and then subjected to weak magnetic treatment to remove strongly magnetic iron ore. The weak magnetic tailings are deslimed and then subjected to strong magnetic treatment to obtain strong magnetic concentrate and strong magnetic tailings. The strong magnetic concentrate is subjected to desiliconization reverse flotation to obtain desiliconized tailings. The desiliconized tailings are dehydrated, demedicated, and deslimed, and then subjected to niobium flotation I to obtain niobium concentrate I. The strongly magnetic tailings are subjected to niobium flotation II to obtain niobium concentrate II. The niobium concentrate II is dehydrated and demedicated, and then subjected to quality-enhancing flotation III to obtain niobium concentrate III. This method, based on the mineral composition characteristics of the niobium ore, first separates the niobium ore through magnetic separation and then uses different flotation methods for magnetic niobium-containing minerals and non-magnetic niobium-containing minerals to enrich the niobium minerals. This method not only improves the total recovery efficiency of the niobium ore, but also improves the grade of the niobium concentrate and reduces reagent consumption.

Description

Technical Field

[0001] The present invention relates to a niobium ore beneficiation method, in particular to a niobium ore efficient flotation development and utilization method, belonging to the technical field of ore beneficiation. Background Art

[0002] Niobium is a lustrous gray-white transition metal with characteristics such as corrosion resistance and high ductility. It is superconducting at low temperatures. Niobium is the most effective microalloying element in metal materials and is a key element in aerospace, superconducting materials, medical materials, metallurgical industry and other fields.

[0003] Primary niobium deposits are relatively rare in nature. Currently, niobium deposits are classified into two types: granite-related deposits (including rare metal granite-type and pegmatite-type deposits, with the main niobium-bearing minerals being niobium-bearing niobite, niobium-bearing rutile, niobium-bearing yttrium niobium, and black rare gold ore); and deposits associated with alkaline and basic-ultramafic complexes (with the main niobium-bearing minerals being pyrochlore, cerium-niobium perovskite, and calcite). Global niobium resources are primarily concentrated in Brazil and Canada. While domestic niobium reserves are relatively abundant, they are mostly low-grade ores with many associated minerals, making them insufficient to meet domestic demand. Therefore, there is an urgent need to develop technologies for efficiently enriching niobium resources from low-grade ores.

[0004] Flotation is one of the most important methods for industrially recovering various niobium minerals, with collectors playing a key role in the collection and enrichment of niobium minerals. Niobium mineral flotation collectors include fatty acids, arsenic acids, hydroxamic acids, phosphonic acids, and amines. Although bisphosphonic acid and arsenic acid collectors exhibit good selectivity for niobium-containing minerals such as niobium iron ore and pyrochlore, these collectors can cause significant environmental pollution during their preparation and use. While fatty acids exhibit strong capture capacity for niobium minerals, they often also capture gangue minerals such as carbonates and silicates, resulting in poor selectivity. Hydroxamic acid, on the other hand, exhibits highly selective chelation for metal ions, such as iron, which inevitably leads to the selective enrichment of iron-containing gangue minerals during niobium flotation. This significantly impacts both niobium flotation efficiency and product quality. Amine collectors can effectively capture niobium minerals, but their disadvantage is that they also have strong capture properties for ore slimes and siliceous minerals, and the foam has high viscosity, resulting in a high amount of niobium running out of the tailings, which greatly reduces the recovery rate and grade of the niobium ore. Summary of the Invention

[0005] In view of the technical problems in the existing niobium ore beneficiation process such as poor selectivity, high reagent consumption, high doping of ore slime and siliceous minerals, low niobium ore recovery rate and low recovery grade, the purpose of the present invention is to provide a high-efficiency niobium ore beneficiation method. According to the mineral composition characteristics of niobium ore, the method first performs magnetic separation and then adopts different flotation methods for enriching magnetic niobium-containing minerals and non-magnetic niobium-containing minerals respectively. This method not only improves the total recovery efficiency of niobium ore, but also improves the grade of niobium concentrate and reduces reagent consumption.

[0006] In order to achieve the above technical objectives, the present invention provides an efficient beneficiation method for niobium ore, which comprises the following steps:

[0007] 1) After the niobium ore is crushed, it is subjected to weak magnetic treatment to remove the strongly magnetic iron ore. After the weak magnetic tailings are desludged, they are subjected to strong magnetic treatment to obtain strong magnetic concentrate and strong magnetic tailings;

[0008] 2) After the pH of the strong magnetic concentrate is adjusted, flotation reagents including starch inhibitors and etheramine collectors are added to perform desiliconization reverse flotation to obtain desiliconized tailings;

[0009] 3) After dehydrating, removing drugs and desludging the desiliconized tailings, flotation reagents including a fluosilicic acid inhibitor and an amine collector are added to carry out niobium flotation I to obtain niobium concentrate I;

[0010] 4) The strong magnetic tailings are added with flotation reagents including silicon mineral inhibitors and hydroxamic acid metal complex collectors to carry out niobium flotation II to obtain niobium concentrate II.

[0011] 5) After dehydration and drug removal, the niobium concentrate II is subjected to flotation upgrading and flotation III by adding flotation reagents including a fluosilicic acid inhibitor-activator and an amine collector to obtain niobium concentrate III.

[0012] The main minerals contained in the niobium ore of the present invention are calcite [CaCO3], dolomite [CaMg(CO3)2], ankerite [Ca(Mg,Fe)(CO3)2], potassium feldspar [K2O·Al2O3·6SiO2], phlogopite [KMg3(Si3AlO 10 )(OH)2], biotite [K(Mg,Fe)3(Al,Fe)Si3O 10 )(OH,F)2], magnetite [Fe3O4], apatite [Ca5(PO4)3(F,OH)] and pyrochlore [(Ca,Na)2(Nb,Ti)2O6F], etc.

[0013] The present invention is based on the phase composition and distribution characteristics of niobium ore, based on the fact that niobium ore mainly contains gangue minerals such as iron minerals and siliceous minerals and niobium minerals, and conventional amine collectors are more sensitive to siliceous minerals, while hydroxamic acid collectors are difficult to achieve iron-niobium separation. The key to the present invention is to first perform pre-separation by magnetic separation, use weak magnetic separation to remove strongly magnetic iron ores such as magnetite, and then use strong magnetism to separate niobium minerals into two parts: magnetic niobium-containing minerals and non-magnetic niobium-containing minerals. The main gangue minerals in the magnetic niobium-containing minerals are iron minerals. The main gangue minerals of non-magnetic niobium-containing minerals are siliceous minerals. Based on the mineral composition characteristics of magnetic niobium-containing minerals and non-magnetic niobium minerals, reasonable flotation reagent systems are designed respectively. After further desiliconization of magnetic niobium-containing minerals, amine collectors are used to achieve efficient flotation separation of niobium-containing minerals and ferrous gangue minerals. Hydroxamic acid metal complex collectors are used to achieve efficient separation of niobium-containing minerals and siliceous gangue minerals for non-magnetic niobium-containing minerals. Amine collectors are then further used for flotation upgrading to improve the grade of niobium ore. In summary, the present invention has a rationally designed mineral processing process, which can greatly improve the recovery rate of niobium ore and simplify the process flow.

[0014] As a preferred solution, the weak magnetic treatment uses a magnetic field strength of 0.15 to 0.3 T. Through the weak magnetic treatment, magnetite, ilmenite, hematite and other minerals with strong magnetism can be preferentially removed, reducing the difficulty of subsequent iron-niobium flotation separation.

[0015] As a preferred solution, the strong magnetic treatment uses a magnetic field strength of 1.2 to 1.5 T. This strong magnetic treatment can separate weakly magnetic iron minerals and associated niobium minerals from siliceous minerals. The main purpose is to achieve desiliconization and prevent the siliceous minerals from affecting the recovery of niobium ore by amine collectors.

[0016] As a preferred solution, in 2), the pH is adjusted to 10-11. Under the preferred pH conditions, favorable pH conditions are provided for the flotation of siliceous minerals using etheramine collectors.

[0017] As a preferred solution, the desiliconization reverse flotation includes a roughing flotation process. As a more preferred solution, the roughing reagent system is: starch inhibitor 300~800g / t; etheramine collector 100~300g / t. Starch inhibitor is mainly used to inhibit iron minerals. Etheramine collector is specifically C 10 ~C 13 Etheramine acetate.

[0018] As a preferred solution, the niobium flotation process (I) utilizes a one-roughing, three-fining flotation process. The roughing flotation reagent system includes: 1500-2500 g / t of fluosilicic acid inhibitor, 100-300 g / t of amine collector, and 30-80 g / t of defoamer. The primary concentrating flotation reagent system includes: 1500-2500 g / t of fluosilicic acid inhibitor and 30-80 g / t of amine collector. The secondary concentrating flotation reagent system includes: 1500-2500 g / t of fluosilicic acid inhibitor. The tertiary concentrating flotation reagent system includes: 1300-1800 g / t of fluosilicic acid inhibitor. The fluosilicic acid inhibitor serves as a pH adjuster to adjust the pH range for flotation and as a suppressant, primarily for iron minerals. After strong magnetic separation of siliceous minerals, the impact of siliceous minerals on niobium mineral separation with the amine collector is significantly reduced. An example of a defoamer is P86.

[0019] As a more preferred solution, the amine collector includes a fatty diamine having 10 to 20 carbon atoms.

[0020] As a preferred solution, the niobium flotation II employs a one-rougher, three-fine flotation process. The rougher flotation reagent system includes: 50-150 g / t of silicon mineral depressant, 300-800 g / t of hydroxamic acid metal complex collector, and 30-80 g / t of frother; the primary finer flotation reagent system includes: 30-80 g / t of silicon mineral depressant; the secondary finer flotation reagent system includes: 15-35 g / t of silicon mineral depressant; and the tertiary finer flotation reagent system includes: 5-15 g / t of silicon mineral depressant. The frother is preferably BK205. Because highly magnetic tailings also contain non-magnetic iron ore, the use of a hydroxamic acid metal complex collector in combination with a silicon mineral depressant enhances the flotation separation of silicon minerals from niobium minerals. A small amount of non-magnetic iron minerals enter the concentrate along with the niobium minerals, allowing for subsequent use of amine collectors to facilitate further upgrading of the niobium minerals.

[0021] As a more preferred solution, the silicon mineral inhibitor includes at least one of sodium hexametaphosphate, carboxymethyl cellulose, tannin, water glass, salinized water glass, sodium fluorosilicate, fluorosilicic acid, and starch.

[0022] As a more preferred solution, the hydroxamic acid metal organic complex collector is composed of at least one of benzohydroxamic acid, salicylic hydroxamic acid, an alkyl hydroxamic acid having 5 to 9 carbon atoms, and Pb 2+ 、Zn 2+ 、Al 3+ 、Cu 2+ 、Fe 2+ 、Fe 3+At least one of the following is assembled in a mass ratio of 8:1 to 12:1. As a preferred embodiment, the upgraded flotation process III utilizes a coarse and fine flotation process. The coarse flotation process uses a reagent system consisting of 1500-2000 g / t of fluosilicic acid inhibitor-activator and 50-150 g / t of amine collector; the primary fine flotation process uses a reagent system consisting of 1500-2000 g / t of fluosilicic acid inhibitor-activator and 10-30 g / t of amine collector; and the secondary fine flotation process uses a reagent system consisting of 1500-2000 g / t of fluosilicic acid inhibitor-activator. Fluosilicic acid not only inhibits silica minerals but also has a strong activating effect on pyrochlore.

[0023] Compared with the existing technology, the beneficial technical effects brought by the solution of the present invention are:

[0024] The present invention separates niobium ore into magnetic niobium-containing minerals and non-magnetic niobium-containing minerals through magnetic separation based on the physical composition and distribution characteristics of niobium ore. In addition, the present invention combines the mineral characteristics of magnetic niobium-containing minerals and non-magnetic niobium-containing minerals, fully considers the flotation separation behavior of niobium and other impurities such as silicon and iron, and designs a reasonable flotation process to achieve efficient separation of niobium-containing components in magnetic and non-magnetic minerals, thereby ensuring the overall niobium recovery rate, improving the grade of niobium concentrate, and reducing reagent consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a process flow chart of the efficient beneficiation of niobium ore according to the present invention. DETAILED DESCRIPTION

[0026] The following specific examples are intended to further illustrate the present invention, but are not intended to limit the scope of protection of the claims of the present invention.

[0027] Example 1

[0028] In this experiment, a pyrochlore-type niobium-containing ore was selected as the experimental research object. Table 1 below shows the main chemical composition of the niobium-containing ore. Its composition is complex, and the content of valuable elements in the ore is low. The Nb2O5 and TiO2 contents are 1.05% and 2.12% respectively, and the total iron content is 11.52%.

[0029]

[0030] The specific test process is as follows Figure 1 As shown by Figure 1It can be seen that after the raw ore is crushed, it is screened and the coarse particles are returned to the crusher for further crushing. After the crushing, the ore is subjected to weak magnetic treatment, and a portion of the strong magnetic concentrate is removed at a magnetic field strength of 0.2T. Since fine-grained minerals are difficult to separate, the magnetic tailing needs to be desludged. The desludged mineral samples are subjected to strong magnetic separation under a magnetic field strength of 1.5T. The strong magnetic concentrate and strong magnetic tailings are flotation-separated according to their corresponding mineralogical characteristics. During the flotation of strong magnetic concentrate, the influence of magnetic iron minerals on the flotation behavior of niobium needs to be avoided. Therefore, the main method adopts reverse flotation desiliconization pretreatment and amine method acidic conditions to select niobium-containing minerals. The main reagent system used for reverse flotation desiliconization is: NaOH pH=10, corn starch 500g / t, C 10 Etheramine acetate (commercial product) 200g / t. Reverse flotation desiliconization adopts a roughing process. The desiliconized tailings are dehydrated and de-doped, and fine mud particles are further removed before niobium mineral flotation tests.

[0031] During the flotation of niobium-containing minerals, the reagent system employed primarily consists of 2000g / t of fluorosilicic acid, 50g / t of defoamer P86, and 200g / t of a commercial C16 saturated fatty diamine. The primary gangue minerals of pyrochlore are SiO2 and iron-containing minerals. Therefore, during the flotation of niobium-containing minerals, pyrochlore can be separated from silica and iron-containing minerals based on the mineral surface electrical properties.

[0032] The main part of the niobium flotation process adopts a one-rough and three-fine flotation process. Fluosilicic acid is used as a depressant in the main concentrating process. The reagent system for the first concentrating process is: 2000g / t of fluosilicic acid depressant, 50g / t of C16 saturated fatty diamine; the reagent system for the second concentrating process is: 2000g / t of fluosilicic acid depressant; the reagent system for the tertiary concentrating process is: 1500g / t of fluosilicic acid depressant.

[0033] During the flotation of high-strength magnetic tailings, a hydroxamic acid-lead metal-based collector is primarily used to enhance the capture of niobium-containing minerals. The roughing reagent system is: 100 g / t tannic acid depressant, a hydroxamic acid-lead metal-based collector (50 g / t lead nitrate, 500 g / t hydroxamic acid), and a frother (50 g / t BK205). Tannic acid is used as a depressant in the cleaning stage to gradually suppress silicate minerals, and middlings are sequentially returned to the previous flotation stage. The primary cleaning reagent system is 50 g / t tannic acid depressant; the secondary cleaning reagent system is 25 g / t tannic acid depressant; and the tertiary cleaning reagent system is 10 g / t tannic acid depressant. After the first roughing and third fine flotation process, dehydration and de-doping are performed. Niobium collectors are then used to further improve the quality of the niobium minerals. The reagent system used is 2000g / t of fluorosilicic acid and 100g / t of C16 saturated fatty diamine. The flotation process mainly consists of one coarse and two fine flotation processes. The reagent system for the first fine flotation process is: 2000g / t of fluorosilicic acid and 20g / t of C16 saturated fatty diamine; the reagent system for the second fine flotation process is: 2000g / t of fluorosilicic acid.

[0034] The test results are shown in Table 2 below. The overall niobium flotation recovery rate, calculated based on the pre-magnetic separation feed, demonstrates a significant improvement in the niobium concentrate grade. The Nb2O5 grade in niobium concentrate 1 reached 38.27%, while that in niobium concentrate 2 reached 37.42%, a significant improvement compared to the 1.05% Nb2O5 content in the original ore. Furthermore, the overall niobium flotation recovery rate was also quite impressive, with niobium concentrate 1 having a recovery rate of 31.74% and niobium concentrate 2 having a recovery rate of 36.35%, totaling nearly 70%. This demonstrates that the mineral processing method of the present invention can effectively enrich niobium minerals from low-grade pyrochlore-type niobium-bearing original ore, achieving efficient separation of niobium-containing components from magnetic and non-magnetic minerals, while simultaneously improving the niobium concentrate grade and ensuring niobium recovery. This validates the feasibility and effectiveness of this method in practical applications and provides strong technical support for the development and utilization of low-grade niobium ore resources.

[0035]

[0036] Example 2

[0037] This experiment selected a pyrochlore-type niobium-containing ore that is the same as that in Example 1 as the experimental research object. Its composition is complex and the content of valuable elements in the ore is low. Its Nb2O5 and TiO2 contents are 1.05% and 2.12% respectively, and the total iron content is 11.52%.

[0038] The specific test process is as follows Figure 1The same, but the reagent system is different. After the raw ore is crushed, it is screened and the coarse particles are returned to the crusher for further crushing. After crushing, the ore is weakly magnetically treated, and a portion of the strong magnetic concentrate is removed at a magnetic field strength of 0.2T. Since fine-grained minerals are difficult to separate, the magnetic tailing needs to be desludged. The desludged mineral samples are subjected to strong magnetic separation under a magnetic field strength of 1.5T. The strong magnetic concentrate and the strong magnetic tailings are flotation-separated according to their corresponding mineralogical characteristics. During the flotation of the strong magnetic concentrate, the influence of magnetic iron minerals on the flotation behavior of niobium needs to be avoided. Therefore, the main method adopts reverse flotation desiliconization pretreatment and the method of selecting niobium-containing minerals under acidic conditions of the amine method. The main reagent system used for reverse flotation desiliconization is: NaOH pH=10.5, corn starch 500g / t, C 10 Etheramine acetate (commercial product) 200g / t. Reverse flotation desiliconization adopts a roughing process. The desiliconized tailings are dehydrated and de-doped, and fine mud particles are further removed before niobium mineral flotation tests.

[0039] During the flotation of niobium-containing minerals, the reagent system employed primarily consists of 2000g / t of fluorosilicic acid, 50g / t of defoamer P86, and 200g / t of a commercial C18 saturated fatty diamine. The primary gangue minerals of pyrochlore are SiO2 and iron-containing minerals. Therefore, during the flotation of niobium-containing minerals, pyrochlore can be separated from silica and iron-containing minerals based on the mineral surface electrical properties.

[0040] The main part of the niobium flotation process adopts a one-rough and three-fine flotation process. Fluosilicic acid is used as a depressant in the main concentrating process. The reagent system for the first concentrating process is: 2000g / t of fluosilicic acid depressant, 50g / t of C18 saturated fatty diamine; the reagent system for the second concentrating process is: 2000g / t of fluosilicic acid depressant; the reagent system for the tertiary concentrating process is: 1500g / t of fluosilicic acid depressant.

[0041] In the flotation process of strong magnetic tailings, the main body adopts hydroxamic acid-lead metal-based collector to enhance the capture of niobium-containing minerals. In the roughing stage, tannin inhibitor 80g / t and hydroxamic acid-lead complex collector (benzohydroxamic acid and Pb 2+ The ore is then dehydrated and de-doped using a niobium collector (coordinating at a mass ratio of 10:1) at 440 g / t and a frother (BK205) at 50 g / t. Tannin inhibitors (40 g / t, 20 g / t, and 8 g / t) are used in the three separate concentrators, respectively. The middlings are returned sequentially. After a single roughing and three fine flotation process, dehydration and drug removal are performed. Niobium collectors are then used to further upgrade and separate the niobium ore. A single roughing and two fine flotation process is employed. Fluosilicic acid inhibitor-activator (1800 g / t) and C18 saturated fatty diamine (80 g / t) are added to the roughing process. Fluosilicic acid (1800 g / t) and C18 saturated fatty diamine (15 g / t) are used in the primary concentrator. Only 1800 g / t of fluosilicic acid is retained in the secondary concentrator.

[0042] The test results are shown in Table 3 below. Niobium concentrate 1 had a Nb2O5 grade of 37.89% and a recovery rate of 29.85%. Niobium concentrate 2 had a Nb2O5 grade of 36.54% and a recovery rate of 34.72%, for a total recovery rate of 64.57%. Compared with Example 1, adjusting the reagent dosage resulted in a slight decrease in niobium concentrate grade, but reduced reagent consumption and improved process stability, demonstrating the flexibility of the present invention in parameter optimization.

[0043]

Claims

1. An efficient beneficiation method for niobium ore, characterized by: The following steps are involved: 1) After the niobium ore is crushed, it is subjected to weak magnetic treatment to remove the strongly magnetic iron ore. After the weak magnetic tailings are desludged, they are subjected to strong magnetic treatment to obtain strong magnetic concentrate and strong magnetic tailings; 2) After the pH of the strong magnetic concentrate is adjusted, flotation reagents including starch inhibitors and etheramine collectors are added to perform desiliconization reverse flotation to obtain desiliconized tailings; 3) after dehydrating, removing the drug and desludging the desiliconized tailings, adding a flotation reagent including a fluosilicic acid inhibitor and an amine collector to carry out niobium flotation I to obtain niobium concentrate I; the amine collector is an aliphatic diamine having 10 to 20 carbon atoms; 4) adding the strong magnetic tailings to a flotation reagent including a silicon mineral inhibitor and a hydroxamic acid metal complex collector to carry out niobium flotation II to obtain niobium concentrate II; 5) After dehydration and drug removal, the niobium concentrate II is subjected to flotation upgrading and flotation III by adding flotation reagents including a fluosilicic acid inhibitor-activator and an amine collector to obtain niobium concentrate III; the amine collector is an aliphatic diamine having 10 to 20 carbon atoms.

2. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: The weak magnetic treatment adopts a magnetic field strength of 0.15~0.3T; The strong magnetic treatment adopts a magnetic field strength of 1.2-1.5T.

3. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: In step 2), the pH is adjusted to 10-11.

4. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: The desiliconization reverse flotation includes a primary roughing flotation process; The rough selection agent system is: 300-800 g / t of starch inhibitor and 100-300 g / t of etheramine collector.

5. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: The niobium flotation I adopts a one-rough three-fine flotation process; in, The reagent system for roughing is: 1500~2500g / t of fluosilicic acid inhibitor, 100~300g / t of amine collector, and 30~80g / t of defoamer; The reagent system for primary selection is: 1500~2500g / t of fluosilicic acid inhibitor and 30~80g / t of amine collector; The reagent system for secondary concentration is: fluosilicic acid inhibitor 1500~2500g / t; The reagent system for the third round of selection is: fluosilicic acid inhibitor 1300~1800g / t.

6. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: The niobium flotation II adopts a one-rough three-fine flotation process; in, The reagent system for roughing is: 50~150g / t of silicon mineral inhibitor, 300~800g / t of hydroxamic acid metal complex collector, and 30~80g / t of foaming agent; The reagent system for primary selection is: 30~80g / t of silicon mineral inhibitor; The reagent system for secondary concentration is: silicon mineral inhibitor 15~35g / t; The reagent system for the third concentration is: 5~15g / t of silicon mineral inhibitors.

7. The efficient beneficiation method of niobium ore according to claim 6, characterized in that: The silicon mineral inhibitor includes at least one of sodium hexametaphosphate, carboxymethyl cellulose, tannin, water glass, salinized water glass, sodium fluorosilicate, fluorosilicic acid, and starch; The hydroxamic acid metal organic complex collector is composed of at least one of benzohydroxamic acid, salicylic hydroxamic acid, an alkyl hydroxamic acid having 5 to 9 carbon atoms, and Pb 2+ 、Zn 2+ 、Al 3+ 、Cu 2+ 、Fe 2+ 、Fe 3+ At least one of them is assembled in a coordination ratio of 8:1 to 12:

1.

8. The efficient beneficiation method of niobium ore according to claim 1, characterized in that: The upgrading flotation III adopts a one coarse and two fine flotation process; in, The reagent system for roughing is: 1500~2000g / t of fluosilicic acid inhibitor-activator, 50~150g / t of amine collector; the reagent system for primary cleaning is: 1500~2000g / t of fluosilicic acid inhibitor-activator, 10~30g / t of amine collector; The reagent system for secondary concentration is: fluosilicic acid inhibitor-activator 1500~2000g / t.

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