Method for smelting ferrosilicon alloy by adopting high-silicon iron ore

Abstract

The invention belongs to the technical field of iron alloy material preparation, and particularly relates to a method for smelting a ferrosilicon alloy by adopting high-silicon iron ore. The method for smelting the ferrosilicon alloy through the high-silicon iron ore comprises the following steps that (1) the high-silicon iron ore and a carbon reducing agent are mixed, and mixed powder is obtained; and (2) smelting the mixed powder to obtain the ferrosilicon alloy. The method has the beneficial effects that the ferrosilicon alloy is smelted by adopting the high-silicon iron ore, the cost is low, the economic benefit is high, and the product quality is stable.

Description

Technical Field

[0001] This application belongs to the field of ferroalloy material preparation technology, specifically relating to a method for smelting ferrosilicon alloys using high-silicon iron ore. Background Technology

[0002] Ferrosilicon is widely used in the steel industry as a deoxidizer and alloying agent in the steelmaking process. Silicon and iron are miscible in any proportion and form many silicides, such as Fe5Si3, FeSi, FeSi2, Fe3Si2, and FeSi... 75 wait.

[0003] Currently, traditional ferrosilicon smelting generally employs a slag-free process using steel scrap, silica, and coke as a reducing agent in a submerged arc furnace through continuous heating. Carbon steel scrap is an ideal iron-containing raw material for ferrosilicon smelting. However, on the one hand, my country's annual steel scrap consumption for ferrosilicon alloy smelting is approximately 2 million tons, while steel scrap production is only around 1.8 million tons, resulting in a significant supply-demand gap and a year-on-year price increase due to the shortage. On the other hand, my country's iron ore resources are abundant but of low grade, with various difficult-to-process and difficult-to-utilize ores remaining largely undeveloped. A large amount of low-grade iron ore resources with fine particle size, complex intergrowth relationships, high impurity content, and poor beneficiation are still in the research and development stage. Therefore, using inexpensive raw materials to replace steel scrap in ferrosilicon smelting and reducing smelting costs is a key issue in ferrosilicon smelting, and researching substitutes for steel scrap has become a topic of great interest in recent years.

[0004] Currently, preliminary explorations have been conducted on using existing steel scrap substitutes, such as high-silicon iron ore, pellets, concentrates, waste residue, and iron oxide scale, for ferrosilicon smelting. High-silicon iron ore, in particular, is mainly composed of ferrosilica sandstone and ferroconglomerate, with w(Fe2O3+SiO2) reaching 80%-90%, and even exceeding 95% in some cases, making it a difficult-to-process and utilize ore. Therefore, using this high-silicon, low-grade iron ore to replace steel scrap in ferrosilicon alloy smelting can comprehensively utilize mineral resources for the country and significantly reduce production costs and achieve better economic benefits for enterprises. However, it also presents challenges such as large fluctuations in ore composition, low reduction efficiency leading to low smelting efficiency and high energy consumption, as well as significant environmental pressure and unstable product quality. Summary of the Invention

[0005] This application provides a method for smelting ferrosilicon alloys using high-silicon iron ore, aiming to solve the problem of unstable product composition when using high-quality silicon-containing iron ore instead of steel scrap to smelt ferrosilicon.

[0006] This application provides a method for smelting ferrosilicon alloys using high-silicon iron ore, comprising the following steps:

[0007] (1) Mix high-silicon iron ore and carbon reducing agent to obtain mixed powder;

[0008] (2) The mixed powder is smelted to obtain ferrosilicon alloy.

[0009] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (1), the mass percentage content of silicon in the high-silicon iron ore is 5%-25%.

[0010] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore as described in this application, the carbon reducing agent includes coke and / or semi-coke.

[0011] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the mass ratio of the high-silicon iron ore to the carbon reducing agent is (1-4):5.

[0012] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (1), the mixed powder also includes silica.

[0013] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (1), the mass ratio of the high-silicon iron ore to the silica is (2-3):5.

[0014] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the mass ratio of the high-silicon iron ore to the carbon reducing agent is (2-2.2):5.

[0015] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (1), the equipment used for mixing is a three-dimensional vibrating powder mixer.

[0016] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the particle size of the mixed powder is 20-50 mm.

[0017] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the vibration frequency of the three-dimensional vibrating mixer is 20-60Hz, and the vibration time is 0.5h-8h.

[0018] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the vibration frequency of the three-dimensional vibrating mixer is 30-35Hz, and the vibration time is 0.5h-8h.

[0019] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (2), the smelting temperature is 1400-1700℃ and the smelting time is 8-12h.

[0020] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore as described in this application, the heating rate of the smelting process is 50-200℃ / min.

[0021] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, in step (2), the smelting temperature is 1550-1650℃ and the smelting time is 8-12h.

[0022] According to some embodiments of the method for smelting ferrosilicon alloys using high-silicon iron ore described in this application, the ferrosilicon alloy comprises FeSi 75 or FeSi 90 Al 1.5 .

[0023] The beneficial effects of this application include: the application uses high-silicon iron ore to smelt ferrosilicon alloy, which has low cost, high economic benefits, and stable product quality. Attached Figure Description

[0024] Figure 1a This is a low-magnification microscope image of the high-silicon iron ore described in Example 1 of this application;

[0025] Figure 1b This is a high-magnification microscope image of the high-silicon iron ore described in Embodiment 1 of this application;

[0026] Figure 2a This is a low-magnification microscope image of the silicon-iron alloy described in Embodiment 1 of this application;

[0027] Figure 2b This is a high-magnification microscope image of the silicon-iron alloy described in Embodiment 1 of this application. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] This application provides a method for smelting ferrosilicon alloys using high-silicon iron ore, including the following steps:

[0031] (1) Mix high-silicon iron ore and carbon reducing agent to obtain mixed powder;

[0032] (2) The mixed powder is smelted to obtain a ferrosilicon alloy. The method described in this application has the advantages of uniform powder mixing and stable product composition.

[0033] In some embodiments of this application, in step (1), the mass percentage of silicon in the high-silicon iron ore is 5%-25%, such as 5%, 8%, 10%, 12%, 18%, 22%, 25%, etc.

[0034] In some embodiments of this application, the high-silicon iron ore comprises the following components in mass percentage: SiO2 36.4%, TFe 31.58%, CaO 0.032%, MgO 1.19%, Al2O3 4.25%, S 0.232%, P 0.15%, MnO 0.13%, and Cr2O3 0.038%.

[0035] In some embodiments of this application, in step (1), the carbon reducing agent includes coke and / or semi-coke.

[0036] In some embodiments of this application, in step (1), the mass ratio of the high-silicon iron ore to the carbon reducing agent is (1-4):5; for example, 1:5, 2:5, 2.5:5, 3:5, etc. Under this ratio, the Si element in the high-silicon iron ore can be completely reduced to synthesize ferrosilicon alloy.

[0037] In some embodiments of this application, in step (1), the mixed powder further includes silica. Silica is mainly used to supplement the silicon content in iron silica ore, which is often insufficient to meet the FeSi standard. 90 The compositional requirements of high-grade ferroalloys.

[0038] In some embodiments of this application, in step (1), the mass ratio of the high-silicon iron ore to the silica is (2-3):5, for example 2:5, 2.2:5, 2.5:5, 2.8:5, 3:5, etc.

[0039] In some embodiments of this application, in step (1), the mass ratio of the high-silicon iron ore to the carbon reducing agent is (2-2.2):5.

[0040] In some embodiments of this application, in step (1), the mixing equipment used is a three-dimensional vibration mixer. The three-dimensional vibration mixer has significant advantages in improving product quality, reducing energy consumption and production costs due to its efficient, uniform and gentle mixing characteristics. It is especially suitable for fields with high requirements for mixing accuracy and material integrity.

[0041] In some embodiments of this application, the particle size of the mixed powder is 20-50 mm, such as 20 mm, 22 mm, 25 mm, 30 mm, 32 mm, 38 mm, 43 mm, 47 mm, 50 mm, etc.

[0042] In some embodiments of this application, the vibration frequency of the three-dimensional vibratory mixer is 20-60Hz. Within this vibration range, the materials can be mixed uniformly to the greatest extent possible without resonance. Examples include 20Hz, 23Hz, 28Hz, 32Hz, 43Hz, 46Hz, 57Hz, and 60Hz, with vibration times ranging from 0.5h to 8h, such as 0.5h, 1h, 1.8h, 2.3h, 3.2h, 3.7h, 4.6h, 5.3h, 6.7h, 7.1h, and 8h.

[0043] In some embodiments of this application, the vibration frequency of the three-dimensional vibrating mixer is 30-35Hz, and the vibration time is 0.5h-8h.

[0044] In some embodiments of this application, in step (2), the smelting temperature is 1400-1700℃, such as 1400℃, 1450℃, 1680℃, 1700℃, etc., and the smelting time is 8-12h, such as 8h, 9h, 11h, 12h, etc. Within this temperature range, complete reduction of silicon in high-silicon iron ore can be achieved.

[0045] In some embodiments of this application, the heating rate of the smelting process is 50-200℃ / min, such as 50℃ / min, 80℃ / min, 96℃ / min, 112℃ / min, 138℃ / min, 156℃ / min, 176℃ / min, 183℃ / min, 200℃ / min, etc.

[0046] In some embodiments of this application, in step (2), the smelting temperature is 1550-1650°C and the smelting time is 8-12 hours.

[0047] In some embodiments of this application, the ferrosilicon alloy comprises FeSi 75 or FeSi 90 Al 1.5 .

[0048] The technical solution of this application will be further described below with reference to specific embodiments.

[0049] Example 1

[0050] A method for smelting ferrosilicon alloys using high-silicon iron ore includes the following steps:

[0051] (1) Test the melting temperature of the high silicon iron ore used in the test.

[0052] The high-silicon iron ore used in the experiment was ground and sieved to maintain a particle size of approximately 200 mesh. A small amount of high-silicon iron ore powder was taken, and a small amount of dextrin powder was added as a binder (the mass ratio of high-silicon iron ore powder to dextrin was 20:1). Three cylindrical samples with a diameter of 3 × 3 mm were prepared (numbered A1, A2, and A3, respectively). The melting temperature of the high-silicon iron ore samples was determined using a CQKJ-Ⅱ melting point and melting rate tester. During the test, the changes in the samples were observed. When the sample melted to approximately half the height of the original unmelted sample, the temperature at this point (hemispherical temperature) was recorded, which is the melting point of the tested sample. Specific test data are shown in Table 1.

[0053] Table 1 Melting temperature of high-silicon iron ore

[0054]

[0055]

[0056] As shown in Table 1, the melting temperature of the high-silicon iron ore used in the embodiments of this application is 1425℃ (the average temperature of the three hemispheres).

[0057] (2) Add 5.3 kg of the above-mentioned high-silicon iron ore (whose mass percentage is SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke to a three-dimensional vibrating mixer. Under the condition of a mixing vibration frequency of 30 Hz, the mixture is vibrated and mixed for 2 hours to obtain a mixed powder with a fineness of 25-50 mm.

[0058] (3) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0059] The low-magnification and high-magnification microscope images of the high-silicon iron ore described in this embodiment are as follows: Figure 1a and Figure 1b As shown; the low-power and high-power microscope images of the prepared ferrosilicon alloy are shown in the figures below. Figure 2a and Figure 2b As shown.

[0060] As can be seen from Figures 1 and 2, the high-silicon iron ore described in this embodiment is in an irregular powder form, prone to agglomeration, with uneven particle size and fine particles adhering to the surface of large particles. The ferrosilicon alloy prepared in this embodiment has a regular block morphology, higher density, more uniform particle size, and is less prone to agglomeration.

[0061] Example 2

[0062] The only difference between the method for smelting ferrosilicon alloy using high-silicon iron ore in Example 2 and Example 1 is that, in Example 2, silica is also used as a raw material when smelting ferrosilicon alloy using high-silicon iron ore.

[0063] The specific operating steps include:

[0064] (1) Test the melting temperature of the high silicon iron ore used in the test: The test procedure is the same as in Example 1.

[0065] (2) Testing the explosion resistance of silica:

[0066] Weigh 1 kg of silica, with a particle size of approximately 60-100 mm, and place it in a silicon carbide rod box furnace preheated to 1623 K for 15 minutes. Remove and air-cool. After the silica has cooled to room temperature, sieve it and weigh the silica particles larger than 20 mm on the sieve, recording the weight as M1. The ratio of M1 to the initial silica weight M is the silica's explosion resistance rate. The average value was taken from three tests, and the results are shown in Table 2.

[0067] Table 2. Explosion resistance of silica

[0068]

[0069] (3) Add 10kg of silica, 5.3kg of high-silicon iron ore and 7.7kg of semi-coke to a three-dimensional vibrating mixer and vibrate for 2 hours under a vibration frequency of 30Hz to obtain a mixed powder with a fineness of 25-50mm.

[0070] (4) The above mixed powder was smelted at 1400℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 Al 0.5-A .

[0071] Example 3

[0072] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 3 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 3, the mass ratio of high-silicon iron ore to semi-coke is 2:5, and the remaining operations are the same as in Example 1.

[0073] The specific operating steps include:

[0074] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 13.25 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0075] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0076] Example 4

[0077] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 4 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 4, the mass ratio of high-silicon iron ore to semi-coke is 2.5:5, and the remaining operations are the same as in Example 1.

[0078] The steps include:

[0079] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 10.6 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0080] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0081] Example 5

[0082] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 5 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 5, the mass ratio of high-silicon iron ore to semi-coke is 3:5, and the remaining operations are the same as in Example 1.

[0083] The specific operating steps include:

[0084] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 8.83 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0085] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0086] Example 6

[0087] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 6 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 6, the vibration frequency of the three-dimensional vibrating mixer is 20Hz, and the rest of the operation is the same as in Example 1.

[0088] The specific operating steps include:

[0089] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 20 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0090] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0091] Example 7

[0092] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 7 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 7, the vibration frequency of the three-dimensional vibrating mixer is 35Hz, and the rest of the operation is the same as in Example 1.

[0093] The specific operating steps include:

[0094] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 35 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0095] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0096] Example 8

[0097] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 8 differs from that in Example 1 only in that, during the smelting process of ferrosilicon alloy using high-silicon iron ore in Example 8, the vibration frequency of the three-dimensional vibrating mixer is 60Hz, and the rest of the operation is the same as in Example 1.

[0098] The specific operating steps include:

[0099] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 60 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0100] (2) The above mixed powder was smelted at 1600℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0101] Example 9

[0102] The method for smelting ferrosilicon alloy using high-silicon iron ore in Example 9 differs from that in Example 1 only in that the smelting temperature in Example 9 is 1400℃, while the rest of the operation is the same as in Example 1.

[0103] The specific operating steps include:

[0104] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0105] (2) The above mixed powder was smelted at 1400℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0106] Example 10

[0107] The method for smelting ferrosilicon alloy using high-silicon iron ore in Example 10 differs from that in Example 1 only in that the smelting temperature in Example 10 is 1550°C, while the rest of the operation is the same as in Example 1.

[0108] The specific operating steps include:

[0109] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0110] (3) The above mixed powder was smelted at 1550℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0111] Example 11

[0112] The method for smelting ferrosilicon alloy using high-silicon iron ore described in Example 11 differs from that in Example 1 only in that the smelting temperature during the process of smelting ferrosilicon alloy using high-silicon iron ore in Example 11 is 1700℃, while the rest of the operation is the same as in Example 1.

[0113] The specific operating steps include:

[0114] (1) 5.3 kg of the above-mentioned high-silicon iron ore (with the following mass percentages: SiO2 30.4%, Fe2O3 54%, CaO 0.04%, MgO 1.0%, Al2O3 3.25%, S 0.132%, P 0.05%, MnO 0.23%, Cr2O3 0.02%) and 7.7 kg of semi-coke were added to a three-dimensional vibrating mixer. The mixture was vibrated and mixed for 2 hours at a vibration frequency of 30 Hz to obtain a mixed powder with a fineness of 25-50 mm.

[0115] (3) The above mixed powder was smelted at 1700℃ for 8 hours, with the heating rate limited to 80℃ / min during the smelting process. After smelting, ferrosilicon alloy FeSi was obtained. 75 .

[0116] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for smelting ferrosilicon alloys using high-silicon iron ore, characterized in that, Includes the following steps: (1) Mix high-silicon iron ore and carbon reducing agent to obtain mixed powder; (2) The mixed powder is smelted to obtain ferrosilicon alloy.

2. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, In step (1), the mass percentage of silicon in the high-silicon iron ore is 5%-25%; And / or, the carbon reducing agent includes coke and / or semi-coke; And / or, the mass ratio of the high-silicon iron ore to the carbon reducing agent is (1-4):

5.

3. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, In step (1), the mixed powder also includes silica.

4. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 3, characterized in that, In step (1), the mass ratio of the high-silicon iron ore to the silica is (2-3):5; And / or, the mass ratio of the high-silicon iron ore to the carbon reducing agent is (2-2.2):

5.

5. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, In step (1), the mixing equipment used is a three-dimensional vibration mixer; And / or, the particle size of the mixed powder is 20-50 mm.

6. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 5, characterized in that, The three-dimensional vibrating mixer has a vibration frequency of 20-60Hz and a vibration time of 0.5h-8h.

7. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 5, characterized in that, The three-dimensional vibrating mixer operates at a vibration frequency of 30-35Hz for 0.5-8 hours.

8. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, In step (2), the smelting temperature is 1400-1700℃ and the smelting time is 8-12h; And / or, the heating rate of the smelting process is 50-200℃ / min.

9. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, In step (2), the smelting temperature is 1550-1650℃ and the smelting time is 8-12h.

10. The method for smelting ferrosilicon alloys using high-silicon iron ore according to claim 1, characterized in that, The ferrosilicon alloy includes FeSi 75 or FeSi 90 Al 1.5 .

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