Composite filter aid for iron-manganese ore and preparation method and application thereof

Abstract

The application discloses a kind of iron manganese ore composite filter aid and its preparation method and application, it is related to solid-liquid separation aid technical field, scheme is, composite filter aid is three-component split type, including filter aid component A, B, C, filter aid component A includes polyaluminum ferric chloride, polyferric sulfate and aluminium sulfate, filter aid component B includes sodium humate, sodium dodecyl sulfate and polyethylene glycol, filter aid component C includes anionic polyacrylamide and carboxymethyl modified starch;When preparing, A solution, B solution and C solution are respectively prepared and are respectively stored;When using, adjust iron manganese ore slurry solid content and pH, and according to different ore slurry type matching addition range, adapt magnetic separation, gravity separation and flotation various material system, A, B, C are sequentially added and filtered dewatering.The beneficial effects of the application are: three components play electrical control, surface modification and high molecular flocculation in turn, improve the surface state and floc structure of particles, reduce filter cake drainage resistance, shorten the filtration time and reduce the moisture content of filter cake.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation aids, and in particular to a composite filter aid for iron-manganese ore, its preparation method, and its application. Background Technology

[0002] Iron-manganese ore is a complex ore containing both iron and manganese. In the beneficiation process, fine grinding is typically used to increase the degree of liberation of individual minerals, followed by magnetic separation, gravity separation, and flotation to obtain the corresponding concentrate or tailings products. As grinding fineness increases, the content of fine and ultrafine particles in the slurry increases, the specific surface area of ​​mineral particles increases, and surface hydration of particles intensifies, making filtration and dewatering a crucial limiting step in the subsequent processing of iron-manganese ore. Current slurry dewatering methods usually rely on filter aids to improve particle aggregation or alter slurry filtration performance. The basic idea is to reduce filtration resistance through charge regulation, flocculation, or surface property control, thereby improving filtration efficiency and reducing the moisture content of the filter cake.

[0003] However, iron-manganese ore slurry is not a typical single-metal slurry, and its filtration and dewatering difficulties exhibit distinct systemic characteristics. On one hand, the coexistence of iron oxides, manganese oxides, and gangue minerals results in numerous active sites on the particle surface, strong surface hydrophilicity, and a tendency to form a thick hydration film, making it difficult to remove bound water and capillary water between particles. On the other hand, the high content of fine particles in the slurry leads to dense aggregation between particles, obstructing the filter cake's pore channels and increasing drainage resistance during filtration. Furthermore, free metal ions in the slurry affect the effectiveness of conventional flocculants, weakening the effective extension and bridging ability of polymer chains, resulting in unstable floc structures or insufficient permeability. For slurries containing magnetic minerals, magnetic agglomeration may also occur between particles, further affecting floc uniformity and filter cake structure. Existing filter aid technologies often focus on single charge neutralization or single polymer flocculation, or simply combine inorganic flocculation and polymer flocculation. These technologies typically cannot simultaneously solve problems such as strong hydrophilicity of particle surfaces, high filtration resistance of fine particles, significant ion interference, and insufficient permeability of flocs. Simply increasing the amount of filter aid may also cause excessively dense flocs, clogged filter cake pores, or fluctuating performance under different slurry conditions, making it difficult to stably adapt to different material systems such as magnetically separated iron-manganese concentrate, gravity-separated iron-manganese tailings, and flotation-separated iron-manganese oxide concentrate.

[0004] Therefore, in response to the problems of high fine particle content, strong hydrophilicity of particle surface, complex slurry system, and single function of conventional filter aids in the filtration and dewatering process of iron-manganese ore, it is necessary to develop a filter aid technology that can adapt to the characteristics of iron-manganese ore slurry. This technology can improve the surface state of particles, promote the formation of flocculent structures that are conducive to drainage, reduce the drainage resistance of filter cake, thereby shortening the filtration time and reducing the moisture content of filter cake, and meeting the requirements of subsequent treatment of iron-manganese ore concentrate or tailings for filtration and dewatering performance. Summary of the Invention

[0005] The purpose of this invention is to provide a composite filter aid suitable for the filtration and dewatering process of iron-manganese ore slurry, as well as its preparation and application methods, in order to solve the problems of existing filter aid technologies in treating iron-manganese ore slurry, such as strong hydrophilicity of particle surfaces, high fine-particle filtration resistance, significant interference from free metal ions, insufficient permeability of floc structure, and unstable adaptability to different iron-manganese ore material systems.

[0006] To achieve the above-mentioned objectives and address the above-mentioned technical problems, the present invention provides a composite filter aid for iron-manganese ore. The composite filter aid is a three-component packaged composite filter aid, comprising filter aid component A, filter aid component B, and filter aid component C. The filter aid component A is a modified inorganic flocculant, including polyaluminum ferric chloride, polyferric sulfate and aluminum sulfate; The filter aid component B is a composite surface modification component, including sodium humate, sodium dodecyl sulfate and polyethylene glycol; The filter aid component C is a composite polymer flocculant component, including anionic polyacrylamide and carboxymethyl modified starch.

[0007] Furthermore, the composite filter aid, by mass parts, The filter aid component A comprises 20-40 parts of polyaluminum ferric chloride, 10-25 parts of polyferric sulfate, and 5-15 parts of aluminum sulfate; The filter aid component B comprises 15-30 parts of sodium humate, 10-20 parts of sodium dodecyl sulfate, and 5-15 parts of polyethylene glycol. The mass ratio of anionic polyacrylamide to carboxymethyl modified starch in the filter aid component C is 1:0.3 to 1:0.8.

[0008] Furthermore, the polyaluminum ferric chloride contains ≥28% alumina (aluminum-iron content, calculated as Al2O3), 1.5-5% total iron (Fe), and 20%-85% basicity; The polyferric sulfate contains ≥19.5% total iron (Fe) and has a basicity of 5%–20%. The aluminum sulfate contains ≥15.6% Al2O3.

[0009] Furthermore, the sodium humate contains ≥50% soluble humic acid; The active ingredient content of the sodium dodecyl sulfate is ≥90%; The polyethylene glycol is PEG-400, with an average molecular weight of 380-420.

[0010] Furthermore, The anionic polyacrylamide has a molecular weight of 8 million to 20 million, a degree of hydrolysis of 25% to 40%, and a solid content of ≥88%. The carboxymethyl modified starch is carboxymethyl modified cassava starch with a degree of substitution of 0.25 to 0.4 and a carboxymethyl content of ≥11%.

[0011] Furthermore, When the composite filter aid is used for magnetic separation of iron-manganese concentrate, the following is calculated per ton of dry ore: The amount of filter aid component A added is 255-350 g / t. The amount of filter aid component B added is 110–170 g / t. The amount of filter aid component C added is 26–45 g / t.

[0012] Furthermore, When the composite filter aid is used for gravity separation of iron-manganese tailings, the following is calculated per ton of dry ore: The amount of filter aid component A added is 290–410 g / t. The amount of filter aid component B added is 85–140 g / t. The amount of filter aid component C added is 18–34 g / t.

[0013] Furthermore, When the composite filter aid is used for flotation of iron oxide manganese concentrate, the following is calculated per ton of dry ore: The amount of filter aid component A added is 273–385 g / t. The amount of filter aid component B added is 101–159 g / t. The amount of filter aid component C added is 22-39 g / t.

[0014] This invention also provides a method for preparing the above-mentioned composite filter aid for iron-manganese ore, comprising the following steps: Polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate are mixed with water to prepare a filter aid component A solution with a mass concentration of 8% to 15%. Sodium humate is dissolved in water at 60-80℃, and then sodium dodecyl sulfate and polyethylene glycol are added to prepare a filter aid component B solution with a mass concentration of 5%-10%. Anionic polyacrylamide was prepared into a solution with a mass concentration of 0.1% to 0.3%, and carboxymethyl modified starch was prepared into an aqueous solution with a mass concentration of 0.5% to 1.0%. The two were then mixed to obtain the filter aid component C solution. The filter aid component A solution, filter aid component B solution, and filter aid component C solution are stored separately.

[0015] Furthermore, the method of application includes the following steps: The iron-manganese ore slurry was adjusted to a solid content of 35%–55% and a pH value of 6.0–9.0. Add filter aid component A to the iron-manganese ore slurry and mix for 60-120 s at 200-400 rpm; Then add filter aid component B and mix at 100–200 rpm for 60–120 s; Add filter aid component C and mix at 50–100 rpm for 120–180 s; The resulting slurry is then fed into a filtration device for dewatering. Preferably, the filtration equipment is a ceramic filter, a vacuum cylinder filter, or a plate and frame filter press; When the content of ultrafine particles with a particle size of less than 0.025 mm exceeds 55%, the addition amount of filter aid component C should be increased by 15% to 35% relative to the basic addition amount of filter aid component C under the corresponding mineral conditions.

[0016] The beneficial effects of the technical solution provided by this invention are as follows: The composite filter aid for iron-manganese ore provided by this invention is packaged in three components: filter aid component A, filter aid component B, and filter aid component C. Each component is prepared and stored separately, and then added sequentially to the iron-manganese ore slurry before use. This step-by-step addition method allows each component to function sequentially according to the slurry treatment process, avoiding mutual interference between different components before use. This enables the composite filter aid to better adapt to the characteristics of iron-manganese ore slurry, such as fine particles, complex surface properties, and high filtration resistance.

[0017] The filter aid component A in this invention can first perform inorganic flocculation and electrical regulation on the iron-manganese ore slurry particles. The combined action of polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate helps to reduce the electrical repulsion on the particle surface, promotes the initial aggregation of fine particles, and provides a better particle state for subsequent surface modification and polymer bridging flocculation.

[0018] The filter aid component B in this invention can modify the surface of iron-manganese ore particles. The combined action of sodium humate, sodium dodecyl sulfate, and polyethylene glycol helps to improve the problem of strong hydrophilicity and thick hydration film on the surface of iron-manganese ore particles, and reduces the viscosity of the slurry system, thereby improving the ability of water to be discharged from the filter cake during subsequent filtration.

[0019] The filter aid component C in this invention can further exert its polymeric flocculation effect based on the aforementioned electrical regulation and surface modification. The combined use of anionic polyacrylamide and carboxymethyl modified starch promotes the formation of larger, more permeable floc structures from fine particles, improves the filter cake pore channels, and reduces the filter cake drainage resistance.

[0020] Compared with solutions that do not add filter aids, use inorganic flocculants alone, use polymeric flocculants alone, and combine conventional inorganic flocculants with polymeric flocculants, the three-component composite filter aid system of the present invention can achieve better filtration and dewatering effects, which are manifested in a smoother filtration process, improved filtration efficiency, and reduced filter cake moisture content.

[0021] In this invention, the addition of filter aid component B further enhances the regulatory effect of the composite filter aid on the surface state of iron-manganese ore particles, and makes the synergistic effect between filter aid components A and C more complete. Therefore, filter aid component B is not an ordinary auxiliary additive, but an important component for improving the filtration and dewatering performance of iron-manganese ore slurry.

[0022] In summary, this invention, through the stepwise synergistic effect of modified inorganic flocculants, composite surface modifiers, and composite polymer flocculants, can effectively improve the filtration and dewatering performance of iron-manganese ore slurry, shorten filtration time, reduce filter cake moisture content, and is applicable to different iron-manganese ore slurry systems such as magnetic separation iron-manganese concentrate, gravity separation iron-manganese tailings, and flotation oxidized iron-manganese concentrate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the step-by-step addition process and mechanism of action of the composite filter aid for iron-manganese ore used in the filtration and dewatering of iron-manganese ore slurry according to the present invention.

[0024] Figure 2 The figure shows the test results of the effects of filter aid component A and filter aid component B on the surface properties of iron-manganese ore slurry particles.

[0025] Figure 3 The graph shows a comparison of filtration times in Examples 1-3 and Comparative Examples 1-5.

[0026] Figure 4 This is a comparison chart of the filter cake moisture content in Examples 1-3 and Comparative Examples 1-5. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] Example 1 This embodiment provides a composite filter aid for iron-manganese ore and applies it to the magnetic separation and pressure filtration of iron-manganese concentrate in an iron-manganese ore beneficiation plant.

[0029] Specifically, the steps include the following: S1, Pulp Preparation The magnetic separation concentrate slurry from an iron-manganese ore beneficiation plant was taken. The slurry had a solid content of 48%, TFe of 55.2%, TMn of 11.3%, and D...50 The particle size was 22.5 μm, with particles smaller than 0.045 mm accounting for 68.3% and ultrafine particles smaller than 0.025 mm accounting for 20.3%. The slurry pH was 7.2 and the slurry viscosity was 21.4 mPa·s.

[0030] S2, Preparation of filter aid component A In this embodiment, filter aid component A is a modified inorganic flocculant component, including polyaluminum ferric chloride, polyferric sulfate and aluminum sulfate.

[0031] The polyaluminum ferric chloride contains more than 28% alumina (calculated as Al2O3), 1.5% to 5% total iron (calculated as Fe), and 20.0% to 85.0% basicity; the polyferric sulfate contains more than 19.5% total iron (calculated as Fe) and 5.0% to 20.0% basicity; and the aluminum sulfate contains more than 15.6% Al2O3.

[0032] Polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate were mixed with water to prepare a 10% (w / w) filter aid component A solution. Based on per ton of dry ore, the addition amounts of polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate were 168 g / t, 95 g / t, and 43 g / t, respectively, with a total addition amount of filter aid component A of 306 g / t.

[0033] S3, Preparation of filter aid component B In this embodiment, filter aid component B is a composite surface modification component, including sodium humate, sodium dodecyl sulfate, and polyethylene glycol.

[0034] The sodium humate contains more than 50% soluble humic acid; the sodium dodecyl sulfate contains more than 90% active ingredient; and the polyethylene glycol is PEG-400 with an average molecular weight of 380-420.

[0035] Sodium humate was dissolved in water at 70°C, and then sodium dodecyl sulfate and PEG-400 were added to prepare a 5% (w / w) filter aid component B solution. Based on per ton of dry ore, the addition amounts of sodium humate, sodium dodecyl sulfate, and PEG-400 were 75 g / t, 45 g / t, and 20 g / t, respectively, for a total addition amount of filter aid component B of 140 g / t.

[0036] S4, Preparation of filter aid component C In this embodiment, the filter aid component C is a composite polymer flocculant component, including anionic polyacrylamide and carboxymethyl modified starch.

[0037] The anionic polyacrylamide has a molecular weight of 8 million to 20 million, a degree of hydrolysis of 25% to 40%, and a solid content of 88% or more; the carboxymethyl modified starch is carboxymethyl modified cassava starch with a degree of substitution of 0.25 to 0.4 and a carboxymethyl content of 11% or more.

[0038] Anionic polyacrylamide was prepared into a solution with a mass concentration of 0.1%, and carboxymethyl modified starch was prepared into an aqueous solution with a mass concentration of 0.5%. The two were then mixed at a mass ratio of anionic polyacrylamide to carboxymethyl modified starch of 1:0.46 to obtain the filter aid component C solution.

[0039] Based on per ton of dry ore, the addition amounts of anionic polyacrylamide and carboxymethyl modified starch are 24 g / t and 11 g / t, respectively, and the total addition amount of filter aid component C is 35 g / t; the mass ratio of anionic polyacrylamide to carboxymethyl modified starch is 1:0.46.

[0040] The filter aid component A solution, filter aid component B solution, and filter aid component C solution are stored separately.

[0041] S5, Add filter aid in steps Add filter aid component A to the magnetically separated iron-manganese concentrate slurry obtained in step S1 and mix at 200 rpm for 60 s; then add filter aid component B and mix at 100 rpm for 60 s; then add filter aid component C and mix at 50 rpm for 120 s.

[0042] In this embodiment, ultrafine particles with a particle size of less than 0.025 mm account for 20.3%, which does not exceed 55%, so the amount of filter aid component C added is not increased.

[0043] S6, filtration and dehydration The slurry processed in step S5 is fed into a plate and frame filter press and filtered under a pressure of 0.6 MPa. The filtration time and filter cake moisture content are recorded.

[0044] Example 2 The same three-component preparation and stepwise addition method as in Example 1 was followed, except that this example was used for dewatering iron-manganese tailings from gravity separation in an iron-manganese ore beneficiation plant.

[0045] Pulp conditions: Solid content 40%, containing 18.5% hematite, 12.3% manganese carbonate, 15.6% kaolin, 45.2% quartz, D 50 Its thickness is 32.8 μm, pH is 8.1, and viscosity is 28.6 mPa·s.

[0046] In filter aid component A, the addition amounts of polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate are 195 g / t, 115 g / t, and 52 g / t, respectively, and the total addition amount of filter aid component A is 362 g / t.

[0047] In filter aid component B, the addition amounts of sodium humate, sodium dodecyl sulfate, and PEG-400 are 60 g / t, 37 g / t, and 16 g / t, respectively, with a total addition amount of 113 g / t.

[0048] In filter aid component C, the addition amounts of anionic polyacrylamide and carboxymethyl modified starch are 17 g / t and 9 g / t, respectively, and the total addition amount of filter aid component C is 26 g / t; the mass ratio of anionic polyacrylamide to carboxymethyl modified starch is 1:0.53.

[0049] Example 3 The same three-component preparation and stepwise addition method as in Example 1 was followed, except that this example was used for flotation filtration of iron oxide manganese concentrate.

[0050] Pulp conditions: Solids content 43%, TFe 42.8%, TMn 16.5%, D 50 The sample size was 19.2 μm, the pH was 8.8, the residual sodium oleate was 12 mg / L, and the pine oil was 8 mg / L.

[0051] In filter aid component A, the addition amounts of polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate are 180 g / t, 102 g / t, and 46 g / t, respectively, and the total addition amount of filter aid component A is 328 g / t.

[0052] In filter aid component B, the addition amounts of sodium humate, sodium dodecyl sulfate, and PEG-400 are 68 g / t, 42 g / t, and 18 g / t, respectively, with a total addition amount of 128 g / t.

[0053] In filter aid component C, the addition amounts of anionic polyacrylamide and carboxymethyl modified starch are 20 g / t and 10 g / t, respectively, and the total addition amount of filter aid component C is 30 g / t; the mass ratio of anionic polyacrylamide to carboxymethyl modified starch is 1:0.5.

[0054] Comparative Example 1 The same slurry and filtration conditions as in Example 1 were followed, except that no filter aids were added.

[0055] Comparative Example 2 The same slurry and filtration conditions as in Example 1 were followed, except that APAM was used alone at a dosage of 60 g / t.

[0056] Comparative Example 3 The same slurry and filtration conditions as in Example 1 were followed, except that PAC was used alone at an addition rate of 300 g / t.

[0057] Comparative Example 4 The same slurry and filtration conditions as in Example 1 were followed, except that a PAC+APAM combination was used, with PAC added at 200 g / t and APAM added at 40 g / t.

[0058] Comparative Example 5 The same slurry and filtration conditions as in Example 1 were followed, except that filter aid component A and filter aid component C were used, and filter aid component B was not added.

[0059] Experimental test: 1. Method for determining the moisture content of concentrate / tailings filter cake The hot drying method (gravimetric method / drying and weighing method) involves drying at a constant temperature of 105±5 ℃ until constant weight, and the mass loss is moisture.

[0060] Table 1 Test Data Table

[0061] As shown in Table 1, after adding filter aid components A, B, and C of the present invention in steps in Examples 1-3, the filtration times were 22 min, 32 min, and 23 min, respectively, and the filter cake moisture contents were 11.2%, 14.3%, and 12.8%, respectively. Compared with Comparative Examples 1-5, the scheme of the present invention showed shorter filtration times and lower filter cake moisture contents, indicating that the composite filter aid of the present invention has good filtration and dewatering effects on magnetic separation iron-manganese concentrate, gravity separation iron-manganese tailings, and flotation oxide iron-manganese concentrate.

[0062] In Comparative Example 1, no filter aid was added, the filtration time was 52 min, and the filter cake moisture content was 26.8%. Comparative Example 2 used APAM alone, Comparative Example 3 used PAC alone, and Comparative Example 4 used a combination of PAC and APAM. All of these results showed that the filtration time and filter cake moisture content were higher than in Example 1. This demonstrates that a single filter aid or a conventional PAC+APAM combination is insufficient to achieve the dehydration effect of the three-component composite filter aid of this invention.

[0063] Comparative Example 5 used filter aid components A and C, but without filter aid component B. Its filtration time was 27 min, and the filter cake moisture content was 15.8%. In Example 1, after further adding filter aid component B, the filtration time was reduced to 22 min, and the filter cake moisture content was reduced to 11.2%. These results indicate that filter aid component B can further improve the filtration and dewatering performance of iron-manganese ore slurry.

[0064] Combination Figures 1-4It can be seen that the present invention can improve the surface state of slurry particles, increase filtration efficiency and reduce filter cake moisture content through the stepwise synergistic effect of filter aid component A, filter aid component B and filter aid component C.

[0065] In summary, the composite filter aid of this invention, through its three-component packaging and step-by-step addition, can effectively shorten the filtration time of iron-manganese ore slurry and reduce the moisture content of the filter cake. It has better filtration and dewatering effects than APAM alone, PAC alone, PAC+APAM, and schemes lacking filter aid component B.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite filter aid for iron-manganese ore, characterized in that, The composite filter aid is a three-component packaged composite filter aid, including filter aid component A, filter aid component B and filter aid component C; The filter aid component A is a modified inorganic flocculant, including polyaluminum ferric chloride, polyferric sulfate and aluminum sulfate; The filter aid component B is a composite surface modification component, including sodium humate, sodium dodecyl sulfate and polyethylene glycol; The filter aid component C is a composite polymer flocculant component, including anionic polyacrylamide and carboxymethyl modified starch.

2. The composite filter aid for iron-manganese ore according to claim 1, characterized in that, The composite filter aid, by mass parts The filter aid component A comprises 20-40 parts of polyaluminum ferric chloride, 10-25 parts of polyferric sulfate, and 5-15 parts of aluminum sulfate. The filter aid component B comprises 15-30 parts of sodium humate, 10-20 parts of sodium dodecyl sulfate, and 5-15 parts of polyethylene glycol. The mass ratio of anionic polyacrylamide to carboxymethyl modified starch in the filter aid component C is 1:0.3 to 1:0.

8.

3. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, The polyaluminum ferric chloride contains ≥28% alumina (Al2O3), 1.5-5% total iron, and 20%-85% basicity. The polyferric sulfate contains a total iron content of ≥19.5% and a basicity of 5%–20%. The aluminum sulfate contains ≥15.6% Al2O3.

4. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, The sodium humate contains ≥50% soluble humic acid. The active ingredient content of the sodium dodecyl sulfate is ≥90%; The polyethylene glycol is PEG-400, with an average molecular weight of 380-420.

5. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, The anionic polyacrylamide has a molecular weight of 8 million to 20 million, a degree of hydrolysis of 25% to 40%, and a solid content of ≥88%. The carboxymethyl modified starch is carboxymethyl modified cassava starch with a degree of substitution of 0.25 to 0.4 and a carboxymethyl content of ≥11%.

6. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, When the composite filter aid is used for magnetic separation of iron-manganese concentrate, per ton of dry ore, The amount of filter aid component A added is 255-350 g / t; The amount of filter aid component B added is 110-170 g / t; The amount of filter aid component C added is 26–45 g / t.

7. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, When the composite filter aid is used for gravity separation of iron-manganese tailings, per ton of dry ore, The amount of filter aid component A added is 290–410 g / t; The amount of filter aid component B added is 85-140 g / t; The amount of filter aid component C added is 18–34 g / t.

8. The composite filter aid for iron-manganese ore according to claim 2, characterized in that, When the composite filter aid is used for flotation of iron oxide manganese concentrate, per ton of dry ore, The amount of filter aid component A added is 273-385 g / t; The amount of filter aid component B added is 101-159 g / t; The amount of filter aid component C added is 22-39 g / t.

9. A method for preparing the composite filter aid for iron-manganese ore as described in claim 1, characterized in that, Includes the following steps: Polyaluminum ferric chloride, polyferric sulfate, and aluminum sulfate are mixed with water to prepare a filter aid component A solution with a mass concentration of 8% to 15%. Sodium humate is dissolved in water at 60-80℃, and then sodium dodecyl sulfate and polyethylene glycol are added to prepare a filter aid component B solution with a mass concentration of 5%-10%. Anionic polyacrylamide was prepared into a solution with a mass concentration of 0.1% to 0.3%, and carboxymethyl modified starch was prepared into an aqueous solution with a mass concentration of 0.5% to 1.0%. The two were then mixed to obtain the filter aid component C solution. The filter aid component A solution, filter aid component B solution, and filter aid component C solution are stored separately.

10. A method of using the composite filter aid for iron-manganese ore as described in claim 1, characterized in that, Includes the following steps: The iron-manganese ore slurry was adjusted to a solid content of 35%–55% and a pH value of 6.0–9.

0. Add filter aid component A to the iron-manganese ore slurry and mix for 60-120 s at 200-400 rpm; Then add filter aid component B and mix at 100–200 rpm for 60–120 s; Add filter aid component C and mix at 50–100 rpm for 120–180 s; The resulting slurry is sent to a filtration device for filtration and dewatering.

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