Novel method for preparing super iron ore concentrate from brunin iron ore concentrate

Abstract

The invention discloses a novel method for preparing super iron ore concentrate from brunin iron ore concentrate, which comprises the following steps of: on the basis of not changing the original process flow, taking a four-concentrate concentrate product as a feed, obtaining iron ore concentrate 5 and tailings 5 by adopting a first-section magnetic suspension classificator, feeding the tailings 5 of the first-section magnetic suspension classificator into a regrinding machine 4 to obtain mill discharged ore 4, and feeding the mill discharged ore 4 into a second-section magnetic suspension classificator to obtain the super iron ore concentrate. Mill discharged ore 4 is fed into a second-section magnetic suspension classificator to obtain iron ore concentrate 6 and tailings 6, the tailings 6 of the second-section magnetic suspension classificator serve as final tailings, the concentrate 5 and the concentrate 6 are mixed and fed into a remill 5 to obtain mill discharged ore 5, the mill discharged ore 5 is fed into a third-section magnetic suspension classificator to obtain iron ore concentrate 7 and tailings 7, the iron ore concentrate 7 is fed into flotation to obtain flotation concentrate 8 and tailings 8, and the flotation concentrate 8 and the tailings 8 are fed into a second-section magnetic suspension classificator. And the tailings 5, 7 and 8 are mixed and fed into a remill 4 to obtain mill discharged ore 4. By means of the technological process of magnetic suspension sorting machine-ore grinding-magnetic suspension sorting machine-flotation, the problems that the content of impurities in the four-concentrate concentrate is high, and the product is single and low in additional value are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of mining engineering, and in particular relates to a new method for preparing super iron concentrate from Barun iron concentrate. Background Art

[0002] Super iron concentrate is a new type of functional industrial mineral material with great development potential. It has great application value and market potential in the fields of powder metallurgy, magnetic materials, electronics, chemical industry and environmental protection. Super iron concentrate is mainly divided into two categories: magnetite concentrate with TFe grade>69% and impurity content such as SiO2 less than 3%, which is mainly used in the production of sponge iron; magnetite concentrate with TFe grade>71.5% and significantly lower impurity content such as SiO2, which is mainly used in powder metallurgy, magnetic material production and other fields. Super iron concentrate is the raw material for the production of high value-added materials, which is in line with national industrial policies and market demand, and its sales price is rising year by year.

[0003] The Bayan Obo Mine is a large-scale polymetallic ore deposit with coexistence of iron, rare earth, niobium, etc. It is currently mainly used as ordinary iron concentrate for steel production, and the utilization rate of valuable elements other than rare earth is not high. The production of super iron concentrate is one of the effective ways to improve the economic benefits of enterprises and promote the upgrading of mineral processing products. Compared with ordinary iron concentrate, super iron concentrate (TFe grade ≥ 72%, SiO2 content < 0.25%, Fe3O4 purity > 98.5%), in addition to its own price increase of 4 to 5 times, can also be used as a high-quality raw material for powder metallurgy, magnetic materials, direct reduced iron and clean steel production, especially the Bayan Obo Mine, which contains elements such as RE and Nb. The steel products and ceramic materials prepared with it show super wear resistance. The production of super iron concentrate has emerged in recent years with the development of the metallurgical industry. In order to seek the economic growth point of the enterprise, an experimental study was conducted on the production of super iron concentrate from ordinary iron concentrate in an iron mine in Linyi.

[0004] Experimental study on the production of super iron concentrate in an iron mine in Linyi

[0005] Through experimental research, the process flow and optimal process conditions for preparing super iron concentrate in an iron ore in Linyi were determined: 1) The test research on grinding-weak magnetic separation-concentration, pre-tailings-concentrate regrinding-magnetic separation-concentration, pre-tailings-stage grinding stage selection, pre-tailings-stage grinding stage selection-reverse flotation was carried out for ordinary iron concentrate in an iron ore in Linyi. The test results show that the selection process of pre-tailings-stage grinding stage selection-reverse flotation is more suitable. It was determined that under the conditions of the first-stage grinding fineness of -0.043mm / 98.68%, the second-stage grinding fineness of -0.030mm / 92.05%, and the amount of collector YS-3 of 200g / t, super iron concentrate with a grade of 71.88%, 0.19% acid insoluble matter, and 0.30% silicon dioxide can be obtained.

[0006] Experiment on flotation desiliconization activation of Bayan Obo iron concentrate to prepare super iron concentrate

[0007] Taking the iron concentrate of Bayan Obo Mine as raw material, the reverse flotation desiliconization condition test was carried out. The test results showed that under the optimal test conditions of roughing, pH value was 8, the amount of collector sodium dodecyl sulfate (SDS) was 200g / t, and the amount of Ca2++Fe3+ composite activator was 400g / t, an iron concentrate with an iron grade of 72.05%, an iron recovery rate of 96.58%, and a SiO2 content of 0.22% was obtained; then the iron concentrate was subjected to a 1 roughing and 1 fine reverse flotation desiliconization open-circuit process, and finally a super iron concentrate with an iron grade of 72.15%, an iron recovery rate of 87.46%, and a SiO2 content of 0.21% was obtained, with a purity of 99.64%, and containing trace amounts of rare earth and niobium.

[0008] Experimental study on purification and preparation of super iron concentrate from an iron ore in Anhui

[0009] The iron concentrate produced on site in an iron ore beneficiation plant in Anhui Province has an iron grade of 89.83% at -200 mesh and 66.21%. In order to prepare super iron concentrate, a reverse flotation test was carried out on the ore sample. The results show that the sample adopts 1 coarse and 1 fine reverse flotation to obtain a super iron concentrate with an iron grade of 71.76% and an iron recovery rate of 75.87%. The tailings are combined and re-grinded to -200 mesh 96.21% and then processed by reverse flotation process to obtain a flotation concentrate with an iron grade of 65.66% and a recovery rate of 21.16%. Summary of the invention

[0010] In order to overcome the problem that Barun has long produced iron concentrate with a TFe content greater than 65%, with a high impurity content and low added value of iron concentrate products. Barun iron ore has uneven crystal size, with a high proportion of coarse particles. The ore has the characteristics of producing super iron concentrate. A new method for preparing super iron concentrate from Barun iron concentrate is proposed.

[0011] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0012] The present invention discloses a novel method for preparing super iron concentrate from Barun iron concentrate, comprising the following steps:

[0013] (1) Raw material properties: The raw material used in the present invention is the four-fine concentrate obtained by stage grinding and selection of Barun Company, that is, three-stage grinding and four-stage weak magnetic separation, with the indicators of TFe content greater than 65%, F content greater than 0.4, three-stage ball mill discharge particle size -325 mesh 85%, and iron ore dissociation degree reaching 90%;

[0014] (2) Separation of the four-concentrate concentrate by magnetic suspension separator: The four-concentrate concentrate obtained in the above step (1) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the four-concentrate concentrate slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 5 and tailings 5;

[0015] (3) Tailings 5 ​​regrinding process: regrinding the tailings 5 ​​obtained in the above step (2), with a feed amount of 100g-1000kg and a grinding time of 30s-300s to obtain a mill discharge product 4;

[0016] (4) Reselection process of mill discharge product 4: the mill discharge product 4 obtained in the above step (3) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the four-concentrate concentrate slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 6 and tailings 6, the iron concentrate 6 is used as ordinary iron concentrate for smelting, and the tailings 6 is used as the final tailings;

[0017] (5) Concentrate regrinding process: the concentrate 5 in the above step (2) is fed into the regrinding 5, the feed amount is 100g-1000kg, the grinding time is 30s-300s, and the mill discharge product 5 is obtained;

[0018] (6) Mill discharge reselection process: The mill discharge product 5 in the above step (5) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1 kg / min, a magnetic field strength of 25-200 GS, and an upward water flow of 10-30 L / min, and the slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 7 and tailings 7;

[0019] (7) Flotation process of iron ore concentrate 7: The iron ore concentrate 7 in the above step (6) is fed to flotation, with a feed concentration of 20%-40%, a 0.5L flotation tank, a temperature of 20-35°C, 5% water glass 5-15L / 100Kg, and a collector 5% SF2.5-7.5L / 100Kg.

[0020] Furthermore, in step (3), the laboratory uses an experimental moxa mill.

[0021] Furthermore, the four-concentrate concentrate was subjected to a concentration test using a magnetic suspension separator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry was uniformly fed into the magnetic suspension separator to obtain iron concentrate 5 and tailings 5.

[0022] Furthermore, the mill discharge product 4 was subjected to a concentration test using a magnetic suspension separator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min; the slurry was evenly fed into the magnetic suspension separator to obtain iron concentrate 6 and tailings 6.

[0023] Furthermore, the mill discharge product 5 was subjected to a concentrating test using a magnetic suspension concentrator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry was uniformly fed into the magnetic suspension separator to obtain iron concentrate 7 and tailings 7.

[0024] Furthermore, the iron concentrate 7 was fed into flotation for a concentration test, and the test conditions were as follows: feed concentration was 20%-40%, 0.5L flotation cell, temperature was 20-35°C, 5% water glass 8L / 100Kg, collector 5% SF4L / 100Kg, and the slurry was uniformly fed into the flotation machine to obtain iron concentrate 8 and tailings 8.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are:

[0026] The present invention does not change the original on-site process flow, and the transformation cost is greatly reduced;

[0027] The present invention adopts stage selection and stage grinding, which further reduces the content of recoverable iron in tailings. The tailings can be directly discharged to achieve maximum utilization of resources.

[0028] Compared with the conventional drum magnetic separator, the magnetic suspension concentrator of the present invention has less inclusions in the concentrate;

[0029] The present invention further dissociates the intergrown particles by regrinding the concentrate, thereby improving the concentrate grade.

[0030] The present invention adopts the moxa sand grinding method, and the grinding effect is more significant;

[0031] The present invention adopts flotation to further improve the grade of iron concentrate and realize the production of super iron concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0035] A method for removing iron and fluorine from Barun iron concentrate by magnetic separation, comprising the following steps:

[0036] (1) Raw materials: The raw materials used in the present invention are the stage grinding concentrate of Barun Company, that is, the four-stage concentrate obtained by three-stage grinding and four-stage weak magnetic separation, with the indicators of TFe content greater than 65%, F content greater than 0.4, the three-stage ball mill discharge particle size of -325 mesh 85%, and the iron ore dissociation degree reaching 90%.

[0037] (2) Separation of the four-concentrate concentrate by magnetic suspension separator: The four-concentrate concentrate is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min. The four-concentrate concentrate slurry is uniformly fed into the magnetic suspension separator to obtain iron ore concentrate 5 and tailings 5.

[0038] (3) Tailings regrinding process: The tailings 5 ​​are regrinded. The laboratory uses an experimental argon sand mill with a feed rate of 100g-1000kg and a grinding time of 30s-300s to obtain a mill discharge product 4.

[0039] (4) Reselection process of mill discharge product 4: The mill discharge product 4 is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the four-fine concentrate slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 6 and tailings 6.

[0040] (5) Concentrate regrinding process: The concentrate 5 in the above step (2) is fed into the regrinding mill 5. The laboratory uses an experimental wormwood mill with a feed amount of 100g-1000kg and a grinding time of 30s-300s to obtain a mill discharge product 5.

[0041] (6) Mill discharge reselection process: The mill discharge product 5 in the above step (5) is configured to have a concentration of 15%-25%, an ore feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the slurry is uniformly fed into a magnetic suspension separator to obtain iron ore concentrate 7 and tailings 7.

[0042] (7) Flotation process of iron ore concentrate 7: The iron ore concentrate 7 in the above step (6) is fed to flotation, with a feed concentration of 20%-40%, a 0.5L flotation tank, a temperature of 20-35°C, 5% water glass 5-15L / 100Kg, and a collector 5% SF2.5-7.5L / 100Kg.

[0043] Example 1

[0044] The four-stage concentrate was subjected to a concentrating test using a magnetic suspension concentrator. The test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry was uniformly fed into the magnetic suspension separator to obtain 5 iron concentrates and 5 tailings. The separation results of the first stage magnetic suspension concentrator are shown in Table 1.

[0045] Table 1 Sorting results of the first stage magnetic suspension concentrator

[0046]

[0047] Example 2

[0048] The tailings 5 ​​are ground by the mill 4, and the mill discharge 4 is subjected to a concentrating test using a magnetic suspension concentrator. The test conditions are as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry is uniformly fed into the magnetic suspension separator to obtain iron concentrate 6 and tailings 6. The separation results of the second stage magnetic suspension concentrator are shown in Table 1.

[0049] Table 2 Sorting results of the second stage magnetic suspension concentrator

[0050]

[0051] Example 3

[0052] The concentrate 5 is fed into the mill 5, and the mill discharge 5 is subjected to a concentrating test using a magnetic suspension concentrator. The test conditions are as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry is uniformly fed into the magnetic suspension separator to obtain iron concentrate 7 and tailings 7.

[0053] The separation results of the third stage magnetic suspension concentrator are shown in Table 1

[0054]

[0055] Example 4

[0056] The concentrate 7 was fed into flotation for concentration testing. The test conditions were as follows: feed concentration was 20%-40%, 0.5L flotation cell, temperature was 20-35°C, 5% water glass 8L / 100Kg, collector was 5% SF4L / 100Kg, the slurry was evenly fed into the flotation machine to obtain iron concentrate 8 and tailings 8.

[0057] Table 4 The flotation separation results are shown in Table 4

[0058]

[0059] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A new method for preparing super iron concentrate from Barun iron concentrate, characterized in that: The steps include: (1) Raw material properties: The raw material used in the present invention is the four-fine concentrate obtained by stage grinding and selection of Barun Company, that is, three-stage grinding and four-stage weak magnetic separation, with the indicators of TFe content greater than 65%, F content greater than 0.4, three-stage ball mill discharge particle size -325 mesh 85%, and iron ore dissociation degree reaching 90%; (2) Separation of the four-concentrate concentrate by magnetic suspension separator: The four-concentrate concentrate obtained in the above step (1) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the four-concentrate concentrate slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 5 and tailings 5; (3) Tailings 5 ​​regrinding process: regrinding the tailings 5 ​​obtained in the above step (2), with a feed amount of 100g-1000kg and a grinding time of 30s-300s to obtain a mill discharge product 4; (4) Reselection process of mill discharge product 4: the mill discharge product 4 obtained in the above step (3) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1kg / min, a magnetic field strength of 25-200GS, and an upward water flow of 10-30L / min, and the four-concentrate concentrate slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 6 and tailings 6, the iron concentrate 6 is used as ordinary iron concentrate for smelting, and the tailings 6 is used as the final tailings; (5) Concentrate regrinding process: The concentrate 5 in the above step (2) is fed into the regrinding process, the feed amount is 100g-1000kg, the grinding time is 30s-300s, and the mill discharge product 5 is obtained; (6) Mill discharge reselection process: The mill discharge product 5 in the above step (5) is configured to have a concentration of 15%-25%, a feed rate of 0.25-1 kg / min, a magnetic field strength of 25-200 GS, and an upward water flow of 10-30 L / min, and the slurry is uniformly fed into a magnetic suspension separator to obtain iron concentrate 7 and tailings 7; (7) Flotation process of iron ore concentrate 7: The iron ore concentrate 7 in the above step (6) is fed to flotation, with a feed concentration of 20%-40%, a 0.5L flotation tank, a temperature of 20-35°C, 5% water glass 5-15L / 100Kg, and a collector 5% SF2.5-7.5L / 100Kg.

2. The novel method for preparing super iron concentrate from Barun iron concentrate according to claim 1, characterized in that: In the step (3), the laboratory uses an experimental moxa grinder.

3. The novel method for preparing super iron concentrate from Barun iron concentrate according to claim 1, characterized in that: The four-fine concentrate was subjected to a concentrating test using a magnetic suspension concentrator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry was uniformly fed into the magnetic suspension separator to obtain iron concentrate 5 and tailings 5.

4. The novel method for preparing super iron concentrate from Barun iron concentrate according to claim 1, characterized in that: The mill discharge product 4 was subjected to a concentrating test using a magnetic suspension concentrator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min; the slurry was evenly fed into the magnetic suspension separator to obtain iron concentrate 6 and tailings 6.

5. The novel method for preparing super iron concentrate from Barun iron concentrate according to claim 1, characterized in that: The mill discharge product 5 was subjected to a concentrating test using a magnetic suspension concentrator, and the test conditions were as follows: magnetic field strength: 50-120GS; feed rate: 0.5kg / min; feed concentration: 20%; rising water flow: 20L / min. The slurry was uniformly fed into the magnetic suspension separator to obtain iron concentrate 7 and tailings 7.

6. The novel method for preparing super iron concentrate from Barun iron concentrate according to claim 1, characterized in that: The iron concentrate 7 was fed into flotation for concentration testing. The test conditions were as follows: feed concentration was 20%-40%, 0.5L flotation cell, temperature was 20-35°C, 5% water glass 8L / 100Kg, collector was 5% SF4L / 100Kg, the slurry was evenly fed into the flotation machine to obtain iron concentrate 8 and tailings 8.

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