A method for processing gibbsite-type bauxite

Abstract

The application relates to a gibbsite-type bauxite processing method and belongs to the technical field of mineral processing, which comprises the following steps: crushing and grading gibbsite-type bauxite to obtain coarse-grained material and fine-grained material; removing impurities from the coarse-grained material by gravity separation to obtain gravity separation concentrate and gravity separation tailings; removing impurities from the fine-grained material by centrifugal mineral separation to obtain centrifugal concentrate and centrifugal tailings; wherein the separation density of the gravity separation is 1.7-3.0 g / cm 3 ; the separation density of the centrifugal mineral separation is 1.7-3.2 g / cm 3 ; the aluminum concentrate with high alumina content, high aluminum-silicon ratio and relatively low impurity content is obtained, the tailings with high silicon dioxide content, iron content and titanium content are obtained, the method has the characteristics of short mineral separation process, low mineral separation cost, low investment, high mineral separation efficiency, the concentrate is suitable for producing alumina by the Bayer method, and the tailings are applied to the building material industry.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and specifically relates to a method for processing trihydrate gibbsite-type bauxite. Background Technology

[0002] With the expansion of China's alumina production capacity, the quality of domestic bauxite has declined sharply, making many low-quality bauxite ores unsuitable for Bayer process alumina production. To reduce alumina production costs, many companies have begun using imported ore, specifically gibbsite-type bauxite, which has low alumina content and a relatively high aluminum-silicon ratio. This results in high ore consumption and a large amount of red mud. To alleviate environmental pressures and further increase the alumina content while reducing silicon and iron content in gibbsite-type bauxite, there is an urgent need to develop a low-cost, high-efficiency impurity removal method for gibbsite-type bauxite. This method would effectively reduce impurities in aluminum concentrate, improve concentrate quality, lower alumina production costs, and reduce red mud, which would be of great significance for enhancing the market competitiveness and sustainable development of my country's alumina enterprises.

[0003] The main processes used domestically and internationally for gibbsite-type bauxite include roasting, flotation, gravity separation, and chemical leaching. The impurity removal and purification processes for gibbsite-type bauxite all require grinding the ore to a certain particle size, which is relatively complex, lengthy, and results in relatively high beneficiation costs. These processes cannot meet the current economic and technical requirements of alumina companies for domestic ore. Summary of the Invention

[0004] The purpose of this application is to provide a processing method for gibbsite-type bauxite, in order to solve the problem that the current processes for impurity removal and purification of gibbsite-type bauxite both require grinding the ore to a certain particle size, which leads to complex processes.

[0005] This invention provides a method for processing trihydrate gibbsite-type bauxite, the method comprising:

[0006] The trihydrate gibbsite type bauxite is crushed and classified to obtain coarse-grained material and fine-grained material;

[0007] The coarse-grained material is subjected to gravity separation to remove impurities, yielding gravity concentrate and gravity tailings;

[0008] The fine-grained material is subjected to centrifugal beneficiation to remove impurities, resulting in centrifugal concentrate and centrifugal tailings;

[0009] The sorting density for gravity separation is 1.7-3.0 g / cm³. 3 The separation density of the centrifugal ore separator is 1.7-3.2 g / cm³. 3 .

[0010] Optionally, the feeding pressure for the gravity separation and impurity removal is 0.1-0.5 MPa.

[0011] Optionally, the coarse-grained material has a particle size of n-15 mm, and the fine-grained material has a particle size of 0-n mm, where n is the particle size boundary between the coarse-grained material and the fine-grained material, and the value of n is between 0.074 and 3.

[0012] Optionally, the medium for reselection and impurity removal includes one of water, a saturated calcium chloride solution, and a sodium silicate solution;

[0013] The weighting agent for gravity separation includes at least one of magnetite and ferrosilicon;

[0014] The magnetite and ferrosilicon particles are less than 0.038 mm in size.

[0015] Optionally, the medium for centrifugal mineral processing to remove impurities includes one of water, a saturated calcium chloride solution, and a sodium silicate solution;

[0016] The weighting agent used in centrifugal mineral processing for impurity removal includes ferrosilicon;

[0017] The ferrosilicon particle size is less than 0.038 mm.

[0018] Optionally, the heavy medium cyclone removal is performed using a heavy medium cyclone, which is a two-product heavy medium cyclone.

[0019] Optionally, the centrifugal mineral processing equipment for impurity removal is a water-jacketed centrifuge.

[0020] Optionally, the crushing equipment for the crushing and grading process includes a jaw crusher and a double roll crusher.

[0021] Optionally, the grading equipment for the crushing and grading process includes a classifier, a hydrocyclone, a linear screen, and a high-frequency screen.

[0022] Optionally, the concentrate includes gibbsite; the tailings include quartz, kaolinite, calcite, hematite, and goethite.

[0023] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0024] The method for processing gibbsite-type bauxite provided in this invention first involves crushing and classifying the gibbsite-type bauxite. The coarse-grained material is then subjected to gravity separation for impurity removal, and the fine-grained material is subjected to centrifugal separation for impurity removal. The separation density during gravity separation is controlled to be 1.7-3.0 g / cm³. 3 The separation density for centrifugal ore separation and impurity removal is 1.7-3.2 g / cm³. 3It can produce aluminum concentrate with high alumina content, high aluminum-silicon ratio, and relatively low impurity content, and tailings with high silica, iron, and titanium content. It features a short beneficiation process, low beneficiation cost, low investment, and high beneficiation efficiency. The concentrate is suitable for alumina production using the Bayer process, and the tailings are used in the building materials industry.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a process flow diagram provided in an embodiment of the present invention;

[0028] Figure 2 This is a flowchart of the method provided in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will be described in detail below with reference to specific embodiments and examples, thereby making the advantages and various effects of the present invention more clearly apparent. Those skilled in the art should understand that these specific embodiments and examples are for illustrative purposes only and are not intended to limit the present invention.

[0030] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0031] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0032] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0033] To address the problems of poor beneficiation efficiency, high beneficiation costs, complex processes, and large investments in beneficiation plant equipment in existing gibbsite-type bauxite removal and purification processes, a new process of "crushing-classification + coarse-grained heavy media beneficiation for removal + fine-grained centrifugal beneficiation for removal" is adopted to process gibbsite-type bauxite. This process can produce aluminum concentrate with high alumina content, high aluminum-silicon ratio, and relatively low impurity content, and tailings with high silica, iron, and titanium content. It features a short beneficiation process, low beneficiation cost, low investment, and high beneficiation efficiency. The concentrate is suitable for alumina production using the Bayer process, and the tailings are used in the building materials industry.

[0034] According to a typical embodiment of the present invention, a method for processing trihydrate gibbsite-type bauxite is provided, the method comprising:

[0035] S1. The trihydrate gibbsite-type bauxite is crushed and classified to obtain coarse-grained material and fine-grained material;

[0036] The useful mineral in gibbsite-type bauxite is gibbsite; the gangue minerals are high-density minerals such as kaolinite, quartz, calcite, hematite, and goethite.

[0037] In some embodiments, the particle size of the coarse-grained material is n-15 mm, and the particle size of the fine-grained material is 0-n mm, wherein n is the particle size boundary value between the coarse-grained material and the fine-grained material, and the value of n is between 0.074 and 3.

[0038] The particle size separation value between coarse and fine particles should be controlled between 0.074 and 3. Increasing the particle size of the feed medium hydrocyclone and centrifuge directly affects the final beneficiation index. This is mainly because the aluminum, iron, and silicon minerals in gibbsite-type bauxite have complex intergrowth relationships and fine particle size. Under coarser particle size conditions, mineral liberation is insufficient, resulting in higher alumina content and lower iron oxide content in the tailings during the separation process; higher silica content in the concentrate and lower yield, which directly affects the separation effect.

[0039] In this embodiment, the crushing equipment for crushing and grading includes a jaw crusher and a double roll crusher, and the grading equipment includes a classifier, a hydrocyclone, a linear screen, and a high-frequency screen. Specifically, the crushing equipment is a combination of a jaw crusher and a double roll crusher, the crushing process is a two-stage closed-circuit process, and the crushed particle size is 100% below 15mm; the grading equipment is a combination of a classifier, a hydrocyclone, a linear screen, and a high-frequency screen, with a grading particle size of 3–0.074mm.

[0040] S2. The coarse-grained material is subjected to gravity separation to remove impurities, wherein the separation density of the gravity separation is 1.7-3.0 g / cm³. 3 The result is a gravity concentrate and gravity tailings.

[0041] The separation density for gravity separation to remove impurities is controlled at 2.0-3.0 g / cm³. 3 If the separation density of the heavy medium hydrocyclone is reduced, it will affect the concentrate separation index. This is mainly because under lower separation density conditions, aluminum minerals are difficult to separate from other minerals, resulting in a higher tailings yield, a higher alumina content in the tailings, and a lower concentrate yield.

[0042] In some embodiments, the feed pressure for re-selection and impurity removal is 0.1-0.5 MPa.

[0043] The feed pressure for gravity separation and impurity removal is controlled at 0.1-0.5 MPa. If the feed pressure of the hydrocyclone into the heavy medium is reduced, the separation index of concentrate and tailings will be affected. This is mainly because the feed pressure is insufficient and the centrifugal force is low, which makes it difficult to separate aluminum minerals from other minerals.

[0044] In some embodiments, the medium for reselection and impurity removal includes one of water, a saturated calcium chloride solution, and a sodium silicate solution;

[0045] The weighting agent for gravity separation includes at least one of magnetite and ferrosilicon;

[0046] The magnetite and ferrosilicon particles are less than 0.038 mm in size.

[0047] Specifically, in this embodiment, the mass ratio of the gravity separation medium to the weighting mass is 1:0.9 to 1:3.55. Those skilled in the art can prepare the mixture according to the density required for the experiment.

[0048] In some embodiments, the reselection and impurity removal is performed using a heavy medium cyclone separator, specifically a two-product heavy medium cyclone separator.

[0049] Generally, gravity concentrate mainly contains gibbsite and is suitable for low-temperature Bayer process alumina production. Gravity tailings mainly contain quartz, kaolinite, calcite, hematite, goethite, etc., and can be used in the building materials industry.

[0050] S3. The fine-grained material is subjected to centrifugal separation to remove impurities, wherein the separation density of the centrifugal separation is 1.7-3.2 g / cm³. 3 Centrifuged concentrate and centrifuged tailings were obtained.

[0051] The separation density for centrifugal mineral processing to remove impurities is controlled at 2.5-3.2 g / cm³. 3 If the separation density of the centrifuge is reduced, the tailings separation index will be affected. This is mainly because under lower separation density conditions, aluminum minerals are difficult to separate from other minerals, resulting in a higher tailings yield, a higher alumina content in the tailings, and a lower concentrate yield.

[0052] Specifically, the equipment used for centrifugal mineral processing and impurity removal is a water-jacketed centrifuge.

[0053] In some embodiments, the medium for centrifugal mineral processing to remove impurities includes one of water, a saturated calcium chloride solution, and a sodium silicate solution;

[0054] The weighting agent used in centrifugal mineral processing for impurity removal includes ferrosilicon;

[0055] The ferrosilicon particle size is less than 0.038 mm.

[0056] Specifically, in this embodiment, the mass ratio of the centrifugal mineral processing medium to the weighting agent is 1:0.9 to 1:4.1. Those skilled in the art can prepare the mixture according to the density required for the experiment.

[0057] Generally, centrifugal concentrate mainly contains gibbsite and is suitable for low-temperature Bayer process alumina production. Centrifugal tailings mainly contain quartz, kaolinite, calcite, hematite, goethite, etc., and can be used in the building materials industry.

[0058] The bauxite processing method of this application will be described in detail below with reference to embodiments, comparative examples and experimental data.

[0059] Example 1

[0060] A type of gibbsite bauxite. The raw ore contains 42.85% Al₂O₃, 3.62% SiO₂, 34.51% Fe₂O₃, and 2.86% TiO₂. According to... Figure 1 The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0061] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 3mm particle sizes. The -15mm to +3mm particle sizes are mixed with water and magnetite to prepare a heavy liquid with a density of 1.85g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.15 MPa, yielding heavy concentrate 1 and heavy tailings 1. The -3mm particle size was then separated into a heavy liquid with a density of 2.40 g / cm³ prepared from water and ferrosilicon powder. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0062] Example 2

[0063] A type of gibbsite bauxite. The raw ore contains 45.32% Al₂O₃, 6.76% SiO₂, 28.73% Fe₂O₃, and 3.41% TiO₂. According to... Figure 1The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0064] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 1mm particle sizes. The -15mm to +1mm particle sizes are mixed with sodium silicate solution and ferrosilicon to prepare a heavy liquid with a density of 2.0g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.10 MPa, yielding heavy concentrate 1 and heavy tailings 1. The -1 mm particle size was then separated by mixing sodium silicate solution with ferrosilicon powder to prepare a heavy liquid with a density of 2.50 g / cm³. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0065] Example 3

[0066] A type of gibbsite bauxite. The raw ore contains 43.28% Al₂O₃, 1.53% SiO₂, 36.85% Fe₂O₃, and 3.87% TiO₂. According to... Figure 1 The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0067] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 0.074mm particle sizes. The -15mm to +0.074mm particle sizes are mixed with ferrosilicon in a saturated calcium chloride solution to prepare a heavy liquid with a density of 2.95g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.20 MPa, yielding heavy concentrate 1 and heavy tailings 1. The -0.074 mm particle size was then mixed with ferrosilicon powder in a calcium chloride saturated solution to prepare a heavy liquid with a density of 3.1 g / cm³. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0068] Comparative Example 1

[0069] Comparative Example 1 uses a gibbsite-type bauxite from Example 1. The raw ore has an Al₂O₃ content of 42.85%, a SiO₂ content of 3.62%, a Fe₂O₃ content of 34.51%, and a TiO₂ content of 2.86%. According to... Figure 1 The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0070] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 5mm particle sizes. The -15mm to +5mm particle sizes are mixed with water and magnetite to prepare a heavy liquid with a density of 1.85g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.15 MPa, yielding heavy concentrate 1 and heavy tailings 1. The -5mm particle size was then separated into a heavy liquid with a density of 2.40 g / cm³ prepared from water and ferrosilicon powder. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0071] Comparative Example 2

[0072] Comparative Example 2 used a gibbsite-type bauxite from Example 1. The raw ore contained 42.85% Al₂O₃, 3.62% SiO₂, 34.51% Fe₂O₃, and 2.86% TiO₂. According to... Figure 1 The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0073] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 3mm particle sizes. The -15mm to +3mm particle sizes are mixed with water and magnetite to prepare a heavy liquid with a density of 1.25g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.15 MPa, yielding heavy concentrate 1 and heavy tailings 1. The -3mm particle size was then separated into a heavy liquid with a density of 1.60 g / cm³ prepared from water and ferrosilicon powder. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0074] Comparative Example 3

[0075] Comparative Example 3 used a gibbsite-type bauxite from Example 1. The raw ore contained 42.85% Al₂O₃, 3.62% SiO₂, 34.51% Fe₂O₃, and 2.86% TiO₂. According to... Figure 1 The flowchart shown is a processing method for gibbsite-type bauxite, and a purification test was conducted.

[0076] The specific steps are as follows: The raw ore is processed through a crushing and grading process to obtain crushed products with a particle size of less than 15mm. The crushed products are then graded into 3mm particle sizes. The -15mm to +3mm particle sizes are mixed with water and magnetite to prepare a heavy liquid with a density of 1.85g / cm³. 3 Under the specified conditions, a heavy medium hydrocyclone was used for separation. The feed pressure of the heavy medium hydrocyclone was 0.05 MPa, yielding gravity concentrate 1 and gravity tailings 1. The -3mm particle size was then separated into a heavy liquid with a density of 2.40 g / cm³ prepared from water and ferrosilicon powder. 3 Under the conditions, centrifuges are used for separation to obtain centrifuged concentrate 2 and centrifuged tailings 2; gravity concentrate 1 and centrifuged concentrate 2 are combined into concentrate, and gravity tailings 1 and centrifuged tailings 2 are combined into tailings.

[0077] Experimental Example

[0078] The products obtained in Examples 1-3 and Comparative Examples 1-3 were compared and analyzed, and the results are shown in the table below:

[0079]

[0080] A comparison of the data from Example 1 and Comparative Example 1 shows that increasing the crushing particle size and the particle size of the feed medium hydrocyclone and centrifuge directly affects the final beneficiation index. This is mainly because the aluminum, iron, and silicon minerals in gibbsite-type bauxite have complex intergrowth relationships and fine intergrowth particle size. Under coarser particle size conditions, mineral liberation is insufficient, resulting in higher alumina content and lower iron oxide content in the tailings during the separation process; higher silica content in the concentrate and lower yield, which directly affects the separation effect.

[0081] As can be seen from the data comparison between Example 1 and Comparative Example 2, reducing the separation density of the hydrocyclone and centrifuge affects the separation index of concentrate and tailings. This is mainly because under lower separation density conditions, aluminum minerals are difficult to separate from other minerals, resulting in a higher tailings yield, a higher alumina content in the tailings, and a lower concentrate yield.

[0082] As can be seen from the data comparison between Example 1 and Comparative Example 3, reducing the feeding pressure of the heavy medium hydrocyclone affects the separation index of concentrate and tailings, mainly because insufficient feeding pressure results in low centrifugal force, which cannot effectively separate aluminum minerals from other minerals.

[0083] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0084] The method provided in this invention employs a "crushing-grading + coarse-grained heavy media beneficiation for impurity removal + fine-grained centrifugal beneficiation for impurity removal" process to treat gibbsite-type bauxite. This yields an aluminum concentrate with high alumina content, a high aluminum-to-silicon ratio, and relatively low impurity content, as well as tailings with high silica, iron, and titanium content. The method features a short beneficiation process, low cost, low investment, and high efficiency. The concentrate is suitable for alumina production using the Bayer process, while the tailings are used in the building materials industry. This invention effectively reduces ore consumption and red mud production from gibbsite-type bauxite, providing significant socio-economic benefits for the healthy and sustainable development of the aluminum industry.

[0085] Finally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0086] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0087] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for processing gibbsite-type bauxite, characterized by, The method comprises: Crushing and grading treatment of gibbsite type bauxite to obtain coarse-grained material and fine-grained material; Dressing and impurity removal of the coarse-grained material by gravity separation to obtain gravity separation concentrate and gravity separation tailings; Centrifugal dressing and impurity removal of the fine-grained material to obtain centrifugal concentrate and centrifugal tailings; Combining the gravity separation concentrate and the centrifugal concentrate into concentrate for producing alumina by the Bayer process, and combining the gravity separation tailings and the centrifugal tailings into tailings for the building materials industry; The sorting density of the heavy separation and impurity removal is 1.7-3.0 g / cm 3 The sorting density of the centrifugal separation and impurity removal is 1.7-3.2 g / cm 3 The feeding pressure of the heavy separation and impurity removal is 0.1-0.5 MPa, the particle size of the coarse-grained material is n-15 mm, and the particle size of the fine-grained material is 0-n mm, wherein n is a particle size boundary value of the coarse-grained material and the fine-grained material, and n is between 0.074 and 3. The dressing and impurity removal by gravity separation is performed by a dense medium cyclone, and the dense medium cyclone is a two-product dense medium cyclone; The medium for the dressing and impurity removal by gravity separation comprises one of water, a saturated calcium chloride solution and a sodium silicate solution; The weighting agent for the dressing and impurity removal by gravity separation comprises at least one of magnetite and ferrosilicon; The magnetite and the ferrosilicon have a particle size of less than 0.038 mm; The medium for the centrifugal dressing and impurity removal comprises one of water, a saturated calcium chloride solution and a sodium silicate solution; The weighting agent for the centrifugal dressing and impurity removal comprises ferrosilicon; The ferrosilicon has a particle size of less than 0.038 mm; The gibbsite type bauxite has an Al2O3 content of 42.85%, an SiO2 content of 3.62%, an Fe2O3 content of 34.51% and a TiO2 content of 2.86%.

2. The method of processing gibbsite-type bauxite according to claim 1, characterized in that, The centrifugal dressing and impurity removal device is a water jacketed centrifuge.

3. The method of claim 1, wherein the gibbsite-type bauxite is characterized by, The crushing device for the crushing and grading treatment comprises a jaw crusher and a roller crusher.

4. The method of claim 1, wherein the gibbsite-type bauxite is characterized by, The grading device for the crushing and grading treatment comprises a sizing screen, a cyclone, a linear screen and a high-frequency screen.

5. The method of claim 1, wherein the gibbsite-type bauxite is characterized by, The concentrate comprises gibbsite, and the tailings comprise quartz, kaolinite, calcite, hematite and goethite.

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