Combined collecting agent for low-temperature type iron ore flotation desilicication and application of combined collecting agent

Abstract

The invention discloses a low-temperature combined collector for flotation and desilicication of iron ore and application of the low-temperature combined collector, and belongs to the technical field of iron ore flotation. The combined collecting agent is an anion combined collecting agent and is prepared from three components, the component 1 is sodium oleate, the component 2 is sodium linoleate, the component 3 is sodium caprate, the component 1, the component 2 and the component 3 are prepared into aqueous solutions with the mass concentration being 5% respectively, the proportion of the aqueous solutions of the component 1, the component 2 and the component 3 is adjusted, the aqueous solutions of the component 1, the component 2 and the component 3 are mixed to be uniform, and the low-temperature type iron ore flotation desilicication combined collecting agent is obtained. The combined collecting agent is used for reverse flotation desilicication of refractory iron ore at the low temperature of 10-15 DEG C. According to the combined collecting agent, the defect that a traditional anion collecting agent is poor in collecting capacity under the low-temperature condition is overcome, the ore pulp temperature needed by iron ore reverse flotation desilicication is reduced (heating is not needed), the energy consumption of a dressing plant is effectively reduced, and the combined collecting agent is wide in component source, convenient to commercially obtain, low in cost and beneficial to industrial application and popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of iron ore flotation, and in particular relates to the application of a combined collector for flotation desiliconization of iron ore under low temperature conditions. Background Art

[0003] my country's low-grade and difficult-to-select iron ore resources are widely distributed and have abundant reserves. Flotation is a necessary means to treat my country's low-grade and difficult-to-select iron ore. Iron ore usually uses reverse flotation to remove silicon-containing gangue minerals, such as quartz, chlorite, tremolite, etc. Among them, the reverse flotation process can be divided into cationic collector reverse flotation and anionic collector reverse flotation. Cationic reverse flotation has the characteristics of simple reagent system and low cost, but there are problems such as high foam viscosity and poor stability of flotation process; anionic reverse flotation has the characteristics of high concentrate grade and stable flotation process, but the collector effect is greatly affected by temperature. The water temperature in the northern concentrator is relatively low in winter, usually around 10°C. It is often necessary to heat the slurry to above 45°C to ensure good flotation indicators and high energy consumption. Therefore, the development of iron ore reverse flotation desiliconization collectors for low temperature conditions is the key to achieving increased production and reduced consumption in concentrators.

[0004] At present, with the wide application of reagent molecular structure design and quantum chemical calculation in the field of mineral processing, the continuous screening and development of iron ore flotation collectors, the application of high-efficiency desiliconization collectors for low-grade and difficult-to-select iron ore has become increasingly mature, but the flotation effect of a single collector under low temperature conditions is still unsatisfactory. Therefore, under the existing technical conditions, it is of great significance to develop a combined collector suitable for desiliconization of iron ore under low temperature conditions to reduce the energy consumption of mineral processing plants and improve mineral processing efficiency. Summary of the invention

[0005] In view of the problem that a single collector in the background technology has poor flotation effect under low temperature conditions, the purpose of the present invention is to provide a combined collector for low-temperature iron ore flotation desiliconization and its application. By selecting three anion collectors and combining them in appropriate proportions, efficient reverse flotation desiliconization of iron ore can be achieved under low temperature conditions (10°C-15°C). The combined collector has simple preparation and dosing methods, stable effect, excellent mineral processing indicators, and can effectively reduce the production energy consumption of the mineral processing plant.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] The invention provides a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components, wherein component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and the proportions of the aqueous solutions of components 1, 2, and 3 are adjusted and mixed uniformly to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0008] Furthermore, when configuring the combined collector, the mass ratio of components 1, 2, and 3 is 1:(0.67-1):(0.67-1).

[0009] The present invention provides an application of a combined collector for low-temperature iron ore flotation desiliconization. Under low temperature conditions of 10°C-15°C, the combined collector is used for reverse flotation desiliconization of refractory iron ore.

[0010] Furthermore, the application of the combined collector for low-temperature iron ore flotation desiliconization comprises the following steps:

[0011] (1) Grinding: Grinding the crushed low-grade and difficult-to-select iron ore to obtain slurry;

[0012] (2) Magnetic separation: The ore pulp is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic separation concentrate and weak magnetic separation tailings. The weak magnetic separation tailings are subjected to strong magnetic separation. The obtained strong magnetic separation concentrate and weak magnetic separation concentrate are mixed and stirred to adjust the ore pulp concentration.

[0013] (3) Slurry adjustment: continue to adjust the pH value of the slurry in step (2), and then add iron ore inhibitor, gangue activator and combined collector;

[0014] (4) Anion reverse flotation: The ore pulp treated in step (3) is introduced into a flotation machine for secondary anion reverse flotation to obtain an iron ore concentrate and rougher tailings, and a combined collector is added to the iron ore concentrate for beneficiation, and the rougher tailings are scavenged; after beneficiation of the iron ore concentrate, an iron ore concentrate product and middlings are obtained, and after scavenging of the rougher tailings, the middlings are obtained.

[0015] Furthermore, in step (1), the ore is ground to a fineness of -400 mesh accounting for 70%-85% of the ore pulp.

[0016] Furthermore, in step (2), the slurry concentration is adjusted to 30wt.%-40wt.%.

[0017] Furthermore, in step (3), the pH value of the slurry is adjusted to 11.0-11.5.

[0018] Furthermore, in step (3), the iron ore inhibitor is starch, and the inhibitor dosage is 350g / t-500g / t; the gangue activator is lime, and the activator dosage is 500g / t-750g / t; the combined collector dosage is 400g / t-750g / t.

[0019] Furthermore, in step (4), the coarse iron ore concentrate is added with a combined collector for primary concentration, the dosage of the combined collector is 150g / t-250g / t, and the middlings after primary concentration are returned to the previous anion reverse flotation operation.

[0020] Furthermore, in step (5), the roughing tailings are subjected to three-stage scavenging, and the middlings produced in scavenging I are returned to the previous stage anion reverse flotation operation, and the middlings produced in scavenging II and scavenging III are returned to the previous stage scavenging operation in sequence.

[0021] The combined collector is applied to the reverse flotation desiliconization of low-grade refractory iron ore. The iron ore concentrate TFe grade obtained by grinding-magnetic separation-anion reverse flotation is 64.32%-66.39%, and the iron recovery rate is 75.12%-80.57%.

[0022] The present invention provides a low-temperature iron ore flotation desiliconization combined collector and its application. Compared with conventional iron ore flotation desiliconization agents, the beneficial effects are as follows:

[0023] 1. The present invention develops a combined collector for flotation desiliconization of iron ore under low temperature conditions. By combining the traditional iron ore anion collector sodium oleate with two anion collectors in a certain ratio, the disadvantage of the poor collection ability of the traditional anion collector under low temperature conditions is overcome, the pulp temperature required for reverse flotation desiliconization of iron ore is reduced (no heating is required), and the energy consumption of the ore dressing plant is effectively reduced;

[0024] 2. Among the combined collectors used in the present invention, sodium linoleate and sodium caprate, in addition to sodium oleate, also have good water solubility, foaming properties and the ability to capture silicon-containing gangue minerals. When mixed with sodium oleate, the capture property of sodium oleate is improved by molecular association, and the amount of sodium oleate used is significantly reduced, further achieving cost reduction and efficiency improvement in the process of iron ore development and utilization;

[0025] 3. The combined collector used in the present invention can selectively remove silicate minerals in the iron ore flotation system during use, and the combined collector has a wide source of components, is easy to obtain commercially, has low cost, and is conducive to industrial promotion and use;

[0026] 4. The combined collector of the present invention is used for reverse flotation desiliconization of low-grade refractory iron ore under low temperature conditions (10°C-15°C), and the obtained iron ore concentrate TFe grade is ≥64%, and the iron recovery rate is ≥75%. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a process flow chart of reverse flotation desiliconization of iron ore using the combined collector for low-temperature iron ore flotation desiliconization under low-temperature conditions. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the embodiments.

[0029] The embodiments of the present invention adopt Figure 1 The process flow shown uses the low-temperature combined collector of the present invention to carry out reverse flotation and desiliconization of iron ore under low-temperature conditions.

[0030] Example 1

[0031] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are uniformly mixed in a mass ratio of 1:0.67:1 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0032] Application of low-temperature iron ore flotation desiliconization combined collector, under 15 ℃ conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a difficult-to-select iron ore with a TFe grade of 33.45% as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0033] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 80%;

[0034] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 43.42%. The mixed concentrate is then fed into a mixing barrel to adjust the slurry concentration to 35 wt.%;

[0035] (3) Slurry adjustment: adjust the pH value of the slurry to 11.5, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 500g / t, the activator dosage is 500g / t, and the combined collector dosage is 600g / t;

[0036] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 200 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations is returned to the previous scavenging operation in turn.

[0037] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 1.

[0038] Table 1 Flotation product indicators of Example 1

[0039]

[0040] Example 2

[0041] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are evenly mixed in a mass ratio of 1:0.67:0.67 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0042] Application of low-temperature iron ore flotation desiliconization combined collector, under 15 ℃ conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a difficult-to-select iron ore with a TFe grade of 33.21% as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0043] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 85%;

[0044] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 42.78%. The mixed concentrate is then fed into a stirring barrel to adjust the slurry concentration to 30 wt.%;

[0045] (3) Slurry adjustment: adjust the pH value of the slurry to 11.0, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 400g / t, the activator dosage is 600g / t, and the combined collector dosage is 650g / t;

[0046] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 200 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations is returned to the previous scavenging operation in turn.

[0047] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 2.

[0048] Table 2 Flotation product indicators of Example 2

[0049]

[0050] Example 3

[0051] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are evenly mixed in a mass ratio of 1:1:0.67 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0052] Application of low-temperature iron ore flotation desiliconization combined collector, under 15 ° C conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a difficult-to-select iron ore with a TFe grade of 32.78% as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0053] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 70%;

[0054] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 41.86%. The mixed concentrate is then fed into a mixing barrel to adjust the slurry concentration to a slurry concentration of 40 wt.%;

[0055] (3) Slurry adjustment: adjust the pH value of the slurry to 11.0, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 350 g / t, the activator dosage is 500 g / t, and the combined collector dosage is 400 g / t;

[0056] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 150 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations are returned to the previous scavenging operation in turn.

[0057] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 3.

[0058] Table 3 Flotation product indicators of Example 3

[0059]

[0060]

[0061] Example 4

[0062] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are uniformly mixed in a mass ratio of 1:1:1 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0063] Application of low-temperature iron ore flotation desiliconization combined collector, under 10 ℃ conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a difficult-to-select iron ore with a TFe grade of 33.09% as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0064] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 80%;

[0065] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 43.21%. The mixed concentrate is then fed into a stirring barrel to adjust the slurry concentration to 30 wt.%;

[0066] (3) Slurry adjustment: adjust the pH value of the slurry to 11.5, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 400g / t, the activator dosage is 650g / t, and the combined collector dosage is 700g / t;

[0067] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 230 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations are returned to the previous scavenging operation in turn.

[0068] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 4.

[0069] Table 4 Flotation product indicators of Example 4

[0070]

[0071] Example 5

[0072] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are uniformly mixed in a mass ratio of 1:0.67:1 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0073] Application of low-temperature iron ore flotation desiliconization combined collector, under 10 ℃ conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a difficult-to-select iron ore with a TFe grade of 32.77% as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0074] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 80%;

[0075] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 43.31%. The mixed concentrate is then fed into a stirring barrel to adjust the slurry concentration to 30 wt.%;

[0076] (3) Slurry adjustment: adjust the pH value of the slurry to 11.5, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 500g / t, the activator dosage is 750g / t, and the combined collector dosage is 750g / t;

[0077] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 250 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations is returned to the previous scavenging operation in turn.

[0078] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 5.

[0079] Table 5 Flotation product indicators of Example 5

[0080]

[0081] Example 6

[0082] The invention discloses a combined collector for low-temperature iron ore flotation desiliconization. The combined collector is an anionic combined collector, which is configured from three components. Component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and are evenly mixed in a mass ratio of 1:0.8:0.9 to obtain the combined collector for low-temperature iron ore flotation desiliconization.

[0083] Application of low-temperature iron ore flotation desiliconization combined collector, under 15 ° C conditions, the obtained low-temperature iron ore flotation desiliconization combined collector is used for iron ore reverse flotation desiliconization operation, the iron ore uses a 33.58% TFe grade of difficult-to-select iron ore as the raw ore, the useful minerals in the ore are iron ore and magnetite, and the gangue minerals are mainly quartz, chlorite, etc., including the following steps:

[0084] (1) Grinding: Grinding the crushed low-grade refractory iron ore to obtain a slurry with a grinding fineness of -400 mesh accounting for 85%;

[0085] (2) Magnetic separation: The slurry is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic tailings are further subjected to strong magnetic separation. The obtained strong magnetic concentrate and weak magnetic concentrate are mixed and stirred to obtain a mixed magnetic concentrate with a TFe grade of 44.12%. The mixed concentrate is then fed into a mixing barrel to adjust the slurry concentration to 30 wt.%;

[0086] (3) Slurry adjustment: adjust the pH value of the slurry to 11.2, then add iron ore inhibitor starch, gangue activator lime and combined anion collector, the inhibitor dosage is 450 g / t, the activator dosage is 700 g / t, and the combined collector dosage is 750 g / t;

[0087] (4) Anion reverse flotation: The slurry after slurry adjustment is introduced into a flotation machine for anion reverse flotation to obtain an iron ore rough concentrate and rougher tailings. After adding 230 g / t of anion combination collector, the rougher concentrate is further subjected to first-stage concentration to obtain iron ore concentrate, which is the final product. The intermediate ore produced by the first-stage concentration operation is returned to the previous anion reverse flotation operation; the rougher tailings are further subjected to three-stage scavenging, and the intermediate ore produced by scavenging I is returned to the previous anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations are returned to the previous scavenging operation in turn.

[0088] The TFe grade and recovery rate of the iron ore concentrate and flotation tailings obtained by grinding-magnetic separation-anion reverse flotation are shown in Table 6.

[0089] Table 6 Flotation product indicators of Example 6

[0090]

Claims

1. A combined collector for low-temperature iron ore flotation desiliconization, characterized in that: The combined collector is an anionic combined collector, which is configured from three components, component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium caprate. Components 1, 2, and 3 are respectively configured into aqueous solutions with a mass concentration of 5%, and the ratio of the aqueous solutions of components 1, 2, and 3 is adjusted and mixed evenly to obtain a low-temperature iron ore flotation desiliconization combined collector.

2. A combined collector for low-temperature iron ore flotation desiliconization according to claim 1, characterized in that: When preparing the combined collector, the mass ratio of components 1, 2, and 3 is 1:(0.67-1):(0.67-1).

3. Application of a combined collector for low-temperature iron ore flotation desiliconization, characterized in that: Under low temperature conditions of 10°C-15°C, the combined collector for low temperature iron ore flotation desiliconization according to claim 2 is used for reverse flotation desiliconization of difficult-to-select iron ore.

4. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 3, characterized in that: The following steps are involved: (1) Grinding: Grinding the crushed low-grade and difficult-to-select iron ore to obtain slurry; (2) Magnetic separation: The ore pulp is fed into a magnetic separator for weak magnetic separation to obtain weak magnetic separation concentrate and weak magnetic separation tailings. The weak magnetic separation tailings are subjected to strong magnetic separation. The obtained strong magnetic separation concentrate and weak magnetic separation concentrate are mixed and stirred to adjust the ore pulp concentration. (3) Slurry adjustment: continue to adjust the pH value of the slurry in step (2), and then add iron ore inhibitor, gangue activator and combined collector; (4) Anion reverse flotation: The ore pulp treated in step (3) is introduced into a flotation machine for secondary anion reverse flotation to obtain an iron ore concentrate and rougher tailings, and a combined collector is added to the iron ore concentrate for beneficiation, and the rougher tailings are scavenged; after beneficiation of the iron ore concentrate, an iron ore concentrate product and middlings are obtained, and after scavenging of the rougher tailings, the middlings are obtained.

5. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: Step (1) grinding the ore to a fineness of -400 mesh accounting for 70%-85% of the ore pulp.

6. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: Step (2) adjusts the slurry concentration to 30wt.%-40wt.%.

7. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: Step (3) adjusts the pH value of the slurry to 11.0-11.

5.

8. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: In step (3), the iron ore inhibitor is starch, and the inhibitor dosage is 350g / t-500g / t; the gangue activator is lime, and the activator dosage is 500g / t-750g / t; the combined collector dosage is 400g / t-750g / t.

9. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: In step (4), the coarse iron ore concentrate is added with a combined collector for primary concentration, wherein the amount of the combined collector is 150 g / t-250 g / t. The middlings after primary concentration are returned to the previous anion reverse flotation operation.

10. The use of a combined collector for low-temperature iron ore flotation desiliconization as claimed in claim 4, characterized in that: In step (5), the roughing tailings are subjected to three-stage scavenging. In step (5), the roughing tailings are subjected to three-stage scavenging. The intermediate ore produced by scavenging I is returned to the previous stage anion reverse flotation operation, and the intermediate ore produced by scavenging II and scavenging III operations is returned to the previous stage scavenging operation in sequence.

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