Separation reagent for promoting flotation of iron ore and associated iron-containing silicate and flotation method

Abstract

The invention discloses a separation reagent for promoting flotation of iron ore and associated iron-containing silicate, which is used for adsorbing excessive Ca < 2 + > ions in flotation circulating water and selectively separating specularite and chlorite for reverse flotation. The agents are sequentially added in a proper pH environment and are subjected to reverse flotation operation, floatability difference between iron ore and iron-containing silicate can be effectively promoted, redundant Ca < 2 + > in flotation circulating water is reduced, and the quality of iron ore concentrate can be improved through a reverse flotation means. Compared with the prior art, the flotation agent has the advantages that the flotation agent is high in flotation environment applicability, good flotation performance can be kept in a common environment with the pH being 6-8, meanwhile, the excellent separation effect can be achieved under the low-dosage condition, and the phenomenon that Ca2 + ions are excessive due to the fact that mining filling bodies fall and are mixed into concentrate can be effectively improved. Compared with single use of traditional iron ore inhibitor starch and dextrin, the method has the advantages that better iron ore concentrate indexes can be obtained through a reverse flotation means by using a pre-adsorption agent system, and meanwhile, the phenomenon that excessive Ca < 2 + > ions are entrained and dissolved out from concentrate gangue is further reduced.

Description

Technical Field

[0001] The invention belongs to the field of reverse flotation of iron-containing silicate iron ore, and in particular relates to a reagent and a flotation method for promoting flotation separation of iron ore and associated iron-containing silicate. Background Art

[0002] Iron ore, as an important raw material for the steel industry, is one of the important strategic mineral resources for the industrial development of countries around the world. Although my country has rich iron ore reserves, compared with other countries, my country's iron ore resources generally have the characteristics of "poor, fine, and mixed". Most iron ore types have complex compositions, and difficult-to-separate ores and multi-component co-existing ores account for a large proportion, making separation difficult. As a common iron oxide mineral, specularite is associated with iron-containing silicate gangue chlorite in nature. The two minerals have similar magnetic susceptibility and density. At the same time, chlorite has low hardness and fine particle size distribution. It is easy to be broken during the crushing process. During the grinding process, it will be wrapped on the surface of the iron concentrate particles in the form of mud, which seriously affects the separation effect. The use of reverse flotation for fine-grained minerals can obtain better concentrate indicators.

[0003] In addition, during the underground mining of iron ore, the filling body that has been filled and solidified near the mining area will inevitably collapse during mining and enter the flotation system with the raw ore. The large amount of calcium-containing substances (metallurgical slag and gypsum, etc.) contained in the filling body will cause a large amount of Ca in the grinding and mixing process. 2+ Dissolution, dissolution of Ca 2+ Although no additional activator is needed in the original anion reverse flotation system, excess Ca 2+ It not only consumes the collector in the slurry, causing the grade of the flotation concentrate to drop, but also greatly increases the ionic strength of the slurry solution, increases the viscosity of the slurry, deteriorates the dispersibility of the slurry, causes problems such as difficulty in defoaming and serious flotation troughing, and makes the subsequent impurity removal process more complicated. In actual production, a large amount of decalcifying agent sodium carbonate must be added, and the dosage of inhibitors and collectors must be increased at the same time to barely maintain the flotation index, resulting in a huge waste of resources and cost consumption.

[0004] Therefore, how to use new reagents or processes to improve the separation effect and remove the excess Ca mixed into the slurry during the mining process? 2+ This study has important significance for the efficient utilization of iron-containing silicates. Summary of the invention

[0005] The technical problems to be solved by the present invention are:

[0006] The separation efficiency of iron-containing silicate iron ore is low, the high calcium ion concentration in the circulating water of the slurry caused by the collapse of the mining area filling body affects the flotation selectivity, and the actual production cost of calcium removal is high.

[0007] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0008] A reagent for promoting flotation separation of iron ore and associated iron-containing silicate, comprising component A, inhibitor B and collector;

[0009] The component A is at least one compound having a structural formula of Formula 1 or Formula 2;

[0010] Where, formula 1:

[0011]

[0012] Wherein, the R1 group is a C2-C6 alkyl, phenyl, substituted phenyl or amide group.

[0013] Where, formula 2:

[0014]

[0015] Wherein, the R2 group is a substituent group having a structure of Formula 3 or a substituent group identical to the R1 group;

[0016] Among them, formula 3:

[0017]

[0018] Wherein, the X is at least one of the elements H, Na, K, etc.;

[0019] Wherein, the Y is at least one of the elements such as N and C;

[0020] Wherein, said R3 and R4 are independently at least one of H and C1-C3 alkyl;

[0021] The collector is a fatty acid anion collector, and an excess of Ca 2+ Ions simulate actual production conditions;

[0022] The inhibitor B is a small molecule iron ore inhibitor.

[0023] Preferably, the inhibitor B is one or more of dextrin and modified starch.

[0024] Preferably, the mass ratio of the component A, the inhibitor B and the collector is (0.15-1.5):(0.25-3):1.

[0025] A method for promoting the flotation separation of iron ore and associated iron-containing silicate, comprising crushing, sorting and grinding the iron ore and the iron-containing silicate mineral, mixing and stirring the minerals, adjusting the pH of the slurry to 6-10, and adjusting the Ca 2+The ion concentration is 50-200 mg / L, and the above-mentioned reagent for promoting the flotation separation of iron ore and associated iron-containing silicate is added once for flotation operation, and the iron-containing silicate gangue is separated by reverse flotation.

[0026] The present invention benefits from the excellent selectivity of the reagent (component A) for gangue, which produces pre-adsorption of gangue, thereby enhancing the difference in floatability between gangue minerals and iron ore, and subsequently forms synergistic capture with the collector. The synergistic effect can further enhance the hydrophobicity of gangue minerals, making it easier to be carried and floated by bubbles. At the same time, due to the selectivity of component A, the collector mainly acts on gangue minerals, while having little effect on iron ore, thereby maintaining the selectivity of flotation. Inhibitor B (small molecule inhibitor) can act with the active points on the surface of iron ore during flotation, reduce the adsorption of the collector, thereby reducing the floatability of iron ore and effectively inhibiting iron ore, and finally promote the separation of gangue minerals and iron ore through reverse flotation, which helps to solve the problem of fine-grained iron ore and gangue with similar properties and difficult to separate, and further improve the grade and recovery rate of iron ore.

[0027] Preferably, the pH value of the flotation slurry is 6-8.

[0028] Preferably, the dosage of component A in the flotation process is 6-30 mg / L, and the dosage of inhibitor B is 30-90 mg / L.

[0029] Preferably, the amount of collector used in the flotation process is 30-70 mg / L.

[0030] Preferably, the amount of collector used in the flotation process is 40-50 mg / L.

[0031] Preferably, the flotation pulp temperature is preferably 15-40°C, and more preferably 20-30°C.

[0032] Preferably, the iron-containing silicate gangue mainly includes at least one of chlorite, nepheline, quartz and feldspar, and the iron ore is iron ore concentrate.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. Compared with the use of traditional iron ore inhibitor starch alone, the use of pre-adsorption reagent system can obtain better iron ore concentrate indicators through reverse flotation, and further reduce the phenomenon of concentrate gangue entrainment. At the same time, the use of anionic collectors for flotation can improve the problems of cationic collectors being easy to precipitate in low temperature environments, too thick foam layers during flotation, and poor mineral fluidity.

[0035] 2. The present invention first discovered that component A having the structure of Formula 1 or Formula 2 has excellent selective adsorption for gangue, and further discovered that component A has certain selective collection performance for target gangue minerals, and can form a synergistic collection effect when used in combination with anionic collectors, which can further promote the reverse flotation efficiency of iron ore through synergistic effect.

[0036] 3. At present, the iron ore separation process is cumbersome and complicated. The composite reagent system can effectively reduce the number of separations, while greatly reducing the amount of inhibitors used, further reducing the viscosity of the slurry, which is beneficial to the subsequent processing steps. At the same time, the reagent is environmentally friendly and the flotation wastewater and waste ore treatment is not difficult.

[0037] 4. The iron ore flotation method provided by the present invention can also be used to treat the excess Ca2+ caused by the mixing of the filling body into the ore pulp. 2+ The adsorption of Ca ions not only ensures the activation of the collector, but also enhances the floatability difference between gangue minerals and iron ore, improves the selectivity of the flotation process, and avoids Ca 2+ Excessive ions cause increased collector consumption and thick flotation foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the flotation process in Examples 1 to 7 of the present invention and Comparative Examples 1 to 2;

[0039] Figure 2 This is a schematic diagram of the flotation process of the artificial mixed ore in Example 3;

[0040] Figure 3 The flotation curve of the flotation reagent combination 1 and 2 component A for the effect of the dosage on the specular iron ore and chlorite;

[0041] Figure 4 This paper shows the effect of pulp pH on the flotation of single minerals such as specularite and chlorite. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings, embodiments with better effects and comparative examples. The embodiments described below are only used to illustrate the present invention and are not used to limit the scope of implementation of the present invention.

[0043] Table 1 shows the initial particle size, original origin and metal grade of the ore selected in the present invention.

[0044]

[0045] Example 1

[0046] In order to verify the separation effect of different flotation reagent combinations in the ore pulp of the present invention, we used Figure 1In the flotation process shown, the selected minerals are floated using different flotation reagent combinations 1 and 2 respectively. The parameters involved in the flotation process are the same, and the only difference is the different flotation reagent combinations.

[0047] The specific flotation process of this embodiment is as follows:

[0048] Place 2g of specularite or chlorite in a 50mL flotation tank, add appropriate amount of water and stir thoroughly for 3min, add different flotation reagent solutions, stir for 2min after each addition, then float and scrape for 5min, after the end, filter, dry and weigh the concentrate and tailings respectively, and calculate the recovery rate as shown in Table 2 and Figure 2 shown.

[0049] Flotation reagent combination 1 is component A (the main structure is formula 2, in which Y is N element and R3 is CH2), component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+ Ions simulate the actual production environment;

[0050] Flotation reagent combination 2 is component A (the main structure is formula 2, Y in formula 3 is N element, R4 is CH2), component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+ Ions simulate the actual production environment;

[0051] The mass ratio of reagent addition between A:B:collector = 0.15-0.75:0.75:1;

[0052] Furthermore, the dosages of dextrin and sodium oleate were fixed at 30 mg / L and 40 mg / L, respectively;

[0053] The initial pulp pH of the flotation process was set to 7, and the agitator speed was between 1500-1800 rpm.

[0054] Table 2 shows the effects of different reagent combinations on the recovery of single minerals such as specularite and chlorite

[0055]

[0056]

[0057] Comparative Example 1

[0058] The flotation reagent combination 3 is used to float the selected mineral. In the flotation process, except for the selection of the reagent combination and the reagent dosage, the other parameters and steps involved are the same as those in Example 1.

[0059] Flotation reagent combination 3 is component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+Ions simulate the actual production environment. To ensure the flotation effect, calcium removal agent sodium carbonate is used to absorb excess calcium ions, and the dosage of sodium carbonate is 120 mg / L.

[0060] The mass ratio of reagent addition B: collector = 0.25 ~ 3: 1;

[0061] Furthermore, the amount of collector was fixed at 40 mg / L.

[0062] Table 3 shows the effect of reagent combination 3 on the recovery rate of single minerals of specularite and chlorite

[0063]

[0064] The results of Example 1 and Comparative Example 1 show that under the same single mineral flotation conditions, the traditional flotation reagent combination (dextrin + sodium oleate) has poor separation efficiency for specularite and chlorite, but after adding the component A with a pre-adsorption effect in the present invention, the gangue recovery rate can be significantly improved, so that the iron concentrate can be collected by reverse flotation. Reagent combination 1 and reagent combination 2 achieve the best separation index under the conditions of 12 mg / L and 9 mg / L of component A, respectively, and the collection efficiency of reagent combination 2 for chlorite is better than that of reagent combination 1. This shows that the flotation reagent combination involved in the present invention can efficiently sort iron-containing silicate iron ore, and at the same time, it can achieve a relatively excellent separation effect under low dosage conditions, greatly reducing the cost problem of multiple sorting in the factory.

[0065] Example 2

[0066] The reverse flotation case provided in Example 2 is different from that in Example 1 in that the effect of different pulp pH on the mineral separation effect under the optimal reagent dosage conditions in Example 1 is studied. The flotation process is basically the same as that in Example 1 and will not be described in detail here. The test results are shown in Table 4. Figure 4 shown.

[0067] The pH gradients involved in the experiment were selected as 2, 4, 6, 8, and 10.

[0068] Table 4 shows the effect of different pulp pH on the recovery rate of single minerals of specularite and chlorite

[0069]

[0070] According to Table 4 and Figure 4 The results show that the pH of the slurry affects the activity of each solution component. The pH range of 6 to 8 is more suitable for mineral separation, and 70 to 90% of chlorite can be effectively captured. However, too low a pH value will reduce the recovery rate difference between minerals, resulting in a decrease in the separation effect. When the pH is greater than 8, the recovery rate of mirror iron ore also increases significantly, reducing the effective separation between minerals.

[0071] On the whole, both reagent combination 1 and reagent combination 2 have the best separation effect at pH = 6. At this time, the two combinations can obtain separation indicators of 65.5% and 80.2%, respectively. Therefore, pH = 6 can be selected as the optimal pH for subsequent artificial mixing of ore.

[0072] Example 3

[0073] In order to verify the sorting effect of the flotation reagent combination of the present invention in artificial mixed ore, we used specularite and chlorite to mix evenly in a ratio of 1:1 to carry out artificial mixed ore flotation. The flotation process is basically the same as that of Example 1. The test results are shown in Table 5.

[0074] Flotation reagent combination 1 is component A (the main structure is formula 2, Y in formula 3 is N element, R3 is CH2), component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+ The ions simulate the actual production environment, the reagent addition ratio is 0.3:0.75:1, and the slurry pH is 6;

[0075] Flotation reagent combination 2 is component A (the main structure is formula 2, Y in formula 3 is N element, R4 is CH2), component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+ The ions simulate the actual production environment, the reagent addition ratio is 0.225:0.75:1, and the slurry pH is 6;

[0076] Table 5 shows the effects of different reagent combinations on the indicators of artificial mixed ore of specularite and chlorite

[0077]

[0078]

[0079] Comparative Example 2

[0080] The flotation reagent combination 3 is used to carry out artificial mixed ore flotation on the selected minerals. In the flotation process, except for the selection of the reagent combination and the reagent dosage, the other parameters and steps involved are the same as those in Example 1.

[0081] Flotation reagent combination 3 is component B (dextrin) and collector, the collector is sodium oleate, and 150 mg / L Ca 2+ Ions simulate the actual production environment. To ensure the flotation effect, calcium removal agent sodium carbonate is used to absorb excess calcium ions, and the dosage of sodium carbonate is 120 mg / L. The test results are shown in Table 6.

[0082] Table 6 shows the effect of reagent combination 3 on the indexes of artificial mixed ore of specularite and chlorite

[0083]

[0084] The results of artificially mixed ore in Example 3 and Comparative Example 2 show that the conventional flotation reagent combination 3 has a high concentration of excess Ca 2+ In the environment, a large amount of calcium removal agent sodium carbonate needs to be added in advance to remove excess calcium ions, and the iron grade of the concentrate finally obtained is low, and the separation efficiency is poor. After adding the component A with a pre-adsorption effect in the present invention, the iron concentrate collected by reverse flotation can be significantly improved to obtain excellent concentrate indicators. This shows that the flotation reagent combination involved in the present invention can efficiently separate iron-containing silicate iron ore, while avoiding the excessive Ca2+ introduced into the circulating water of the slurry due to various reasons. 2+ Impact on flotation indicators.

[0085] Embodiments 4 to 7

[0086] In order to further verify the separation effect of the system of the present invention on iron-containing silicate iron ore, the present invention selected 4 kinds of reagents with different structures as component A, and still used specularite and chlorite samples from Lilou mining area in Anhui Province and mixed them evenly in a ratio of 1:1 to carry out artificial mixed ore flotation. The flotation process was basically the same as that in Example 3. The test results are shown in Table 7.

[0087] The reagent combination 3 involved in Example 4 is component A (the main structure is formula 1, R3 is phenyl), component B (dextrin) and a collector, the collector is sodium oleate, and 150 mg / L of Ca 2+ The ions simulate the actual production environment, the reagent addition ratio is 0.375:0.75:1, and the pulp pH is 8;

[0088] The reagent combination 4 involved in Example 5 is component A (the main structure is formula 1, R1 is a C6 alkyl chain), component B (dextrin) and a collector, the collector is sodium oleate, and 150 mg / L of Ca 2+ The ions simulate the actual production environment, the reagent addition ratio is 0.3:0.75:1, and the slurry pH is 6;

[0089] The reagent combination 5 involved in Example 6 is component A (the main structure is formula 1, R1 is formula 3, Y is a C element, and R4 is an alkyl chain and a carboxyl group of C4), component B (dextrin) and a collector, wherein the collector is sodium oleate, and 150 mg / L of Ca 2+ The ions simulate the actual production environment, the reagent addition ratio is 0.225:0.75:1, and the pulp pH is 8;

[0090] The reagent combination 6 involved in Example 7 is component A (the main structure is formula 2, R2 is a C4 alkyl chain), component B (dextrin) and a collector, the collector is sodium oleate, and 150 mg / L of Ca 2+The ions simulate the actual production environment, the reagent addition ratio is 0.225:0.75:1, and the slurry pH is 6;

[0091] Table 7 shows the effects of Examples 4 to 7 on the indexes of artificial mixed ore of specularite and chlorite

[0092]

[0093] It can be seen from Table 6 that the presence of both alkyl chains and carboxyl groups in component A will result in better flotation indexes than the presence of alkyl chains alone, which indicates that the addition of carboxyl groups is beneficial to the adsorption of component A during the flotation process. By comparison with Examples 1 to 7, it can be seen that the flotation concentrate recovery rate of component A under the structure of Formula 2 is more stable, which further indicates that when the number of phosphonic acid groups is greater than or equal to 2, the separation effect on iron-containing silicate minerals is better.

[0094] Example 8

[0095] In order to verify the adsorption effect of the flotation reagent combination of the present invention on various ions, we selected the flotation reagent combinations 1 to 7 selected in Examples 3 to 7 and Comparative Example 1, and used the actual mineral processing circulating water from the Lilou mining area in Anhui Province (the collected target minerals are iron oxide ore, the main gangue is chlorite and quartz, and the main impurity elements of the circulating water are Ca 2+ Mg 2+ 、SO4 2- etc.) were used as test materials for ion adsorption test, and the test results are shown in Table 8.

[0096] Reagent combination 1 is component A (the main structure is formula 2, Y in formula 3 is N element, and R3 is CH2), component B (dextrin) and collector, the collector is sodium oleate, the reagent addition ratio is 0.3:0.75:1, and the pulp pH is 6;

[0097] Reagent combination 2 is component A (the main structure is formula 2, Y in formula 3 is N element, and R4 is CH2), component B (dextrin) and collector, the collector is sodium oleate, the reagent addition ratio is 0.225:0.75:1, and the pulp pH is 6;

[0098] Reagent combination 3 is component A (the main structure is formula 1, R3 is phenyl), component B (dextrin) and collector, the collector is sodium oleate, the reagent addition ratio is 0.375:0.75:1, and the pulp pH is 8;

[0099] Reagent combination 4 is component A (the main structure is formula 1, R1 is a C6 alkyl chain), component B (dextrin) and a collector, the collector is sodium oleate, the reagent addition ratio is 0.3:0.75:1, and the pulp pH is 6;

[0100] Reagent combination 5 is component A (the main structure is formula 1, R1 is formula 3, Y is a C element, R4 is an alkyl chain and a carboxyl group of C4), component B (dextrin) and a collector, the collector is sodium oleate, the reagent addition ratio is 0.225:0.75:1, and the pulp pH is 8;

[0101] Reagent combination 6 is component A (the main structure is formula 2, R2 is a C4 alkyl chain), component B (dextrin) and a collector, the collector is sodium oleate, the reagent addition ratio is 0.225:0.75:1, and the pulp pH is 6;

[0102] Flotation reagent combination 7 is component B (dextrin) and collector, the collector is sodium oleate, the addition ratio is 0.75:1, 120 mg / L sodium carbonate is used for decalcification, and the pulp pH is 7.

[0103] Table 8 shows the removal rate of various ions in the mineral processing circulating water by different reagent combinations (%)

[0104]

[0105] It can be seen from Table 7 that the pre-adsorption agent combination of component A has a significant effect on Ca 2+ The removal rate of ions reached more than 85%, which was significantly improved compared with the traditional reagent combination 7 in the control group. 2+ In addition to the good removal effect of ions on the surface, it can also increase the Mg 2+ ion removal efficiency, while SO4 2- Although it cannot be removed by pre-adsorption of component A, the excess SO4 caused by the pH regulator 2- And some component A salt products can be removed uniformly by post-neutralization process, Ca 2+ The removal of ions greatly facilitates the simplification of the flotation process.

[0106] In summary, compared with conventional flotation, the present invention adds a type of component A containing pre-adsorbed gangue before the inhibitor and collector. First, the research results show that component A can be effectively adsorbed on the surface of gangue, promoting the collection of gangue by the collector, and at the same time combined with component B's effective inhibition of specularite, the combination of the two can effectively improve the gangue recovery rate without affecting the iron ore recovery rate. Secondly, the pre-adsorption system can effectively absorb the excess Ca2+ that enters the flotation circulating water due to the collapse of the filling body. 2+ On the one hand, it reduces the use of decalcifiers and reduces the interference of impurity elements on the grade of iron concentrate. On the other hand, it reduces the amount of collectors used, effectively improving the problems of increased slurry viscosity and poor slurry dispersion, thereby achieving the purpose of purifying iron concentrate from iron-containing silicate mixed iron minerals, and provides a new solution to the problem of difficulty in separating iron ore and iron-containing silicate gangue with similar properties.

Claims

1. A reagent for promoting the flotation separation of iron ore and associated iron-containing silicates, characterized in that: Contains component A, inhibitor B and collector; The component A is at least one compound having a structural formula of Formula 1 or Formula 2; Where, formula 1: Wherein, the R1 group is a C2-C6 alkyl, phenyl, substituted phenyl or amide group; Where, formula 2: Wherein, the R2 group is a substituent group having a structure of Formula 3 or a substituent group identical to the R1 group; Among them, formula 3: Wherein, the X is at least one of the elements H, Na, K, etc.; Wherein, the Y is at least one of the elements such as N and C; Wherein, said R3 and R4 are independently at least one of H and C1-C3 alkyl; The collector is a fatty acid anion collector; The inhibitor B is a small molecule iron ore inhibitor.

2. The reagent for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 1, characterized in that: The inhibitor B is one or more of dextrin and modified starch.

3. The reagent for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 1, characterized in that: The mass ratio of the component A, the inhibitor B and the collector is (0.15-1.5):(0.25-3):

1.

4. A method for promoting the flotation separation of iron ore and associated iron-containing silicates, characterized in that: The iron ore and the iron-containing silicate minerals are crushed, sorted and ground, the minerals are mixed and stirred, and the pH of the slurry is adjusted to 6-10, Ca 2+ The ion concentration is 50-200 mg / L, and a reagent for promoting the flotation separation of iron ore and associated iron-containing silicates as described in any one of claims 1 to 3 is added to perform flotation operation, and the iron-containing silicate gangue is separated by reverse flotation.

5. A method for promoting flotation separation of iron ore and associated iron-containing silicates according to claim 4, characterized in that: The pH value of the flotation slurry is 6-8.

6. A method for promoting flotation separation of iron ore and associated iron-containing silicates according to claim 4, characterized in that: In the flotation process, the dosage of component A is 6-30 mg / L, and the dosage of inhibitor B is 30-90 mg / L.

7. A method for promoting flotation separation of iron ore and associated iron-containing silicates according to claim 4, characterized in that: The dosage of the collector in the flotation process is 30-70 mg / L.

8. A method for promoting flotation separation of iron ore and associated iron-containing silicates according to claim 4, characterized in that: The dosage of the collector in the flotation process is 40-50 mg / L.

9. A method for promoting flotation separation of iron ore and associated iron-containing silicates according to claim 4, characterized in that: The flotation slurry temperature is preferably 15-40°C.

10. A method for promoting flotation separation of iron ore and associated iron-containing silicate according to claim 4, characterized in that: The iron-containing silicate gangue mainly includes at least one of chlorite, aegirine, quartz and feldspar, and the iron ore is iron ore concentrate.

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