A desulfurization method of a sedimentary high-sulfur bauxite

Abstract

The application discloses a desulfurization method for a sedimentary high-sulfur bauxite, which comprises the following steps: A, performing a first-stage grinding operation on the ore, wherein the proportion of the material with a fineness of 0.074 mm in the material obtained through the first-stage grinding operation is 30%-60%, and then performing a gravity separation operation to obtain a first-stage heavy material and a first-stage light material; B, taking the first-stage heavy material to perform a second-stage grinding operation, wherein the proportion of the material with a fineness of 0.074 mm in the material obtained through the second-stage grinding operation is 50%-80%; performing a scavenging operation on the material obtained through the second-stage grinding operation to separate a second-stage heavy material, wherein the second-stage heavy material is a sulfur concentrate; C, taking the first-stage light material to perform a cleaning operation to obtain a gravity separation aluminum concentrate, performing a drying operation on the gravity separation aluminum concentrate after concentration and dehydration, and performing a roasting operation on the dried material after a dispersion operation to obtain an aluminum concentrate. The application can effectively remove sulfur minerals in the sedimentary bauxite and effectively reduce the sulfur content in the bauxite.

Description

Technical Field

[0001] This invention relates to the field of bauxite resource optimization and utilization technology, specifically to a desulfurization method for sedimentary high-sulfur bauxite. Background Technology

[0002] To ensure the sustainable development of my country's alumina industry, research is being conducted on desulfurization processes for some medium- and high-grade high-sulfur bauxite ores in my country, aiming to achieve the industrial application of sulfur-containing bauxite and alleviate the tight supply situation for alumina enterprises. However, sulfur minerals in bauxite can cause significant damage to alumina production.

[0003] The sulfur in high-sulfur bauxite is mainly in the form of sulfide (primarily pyrite) in some cases and mainly in the form of sulfate in others. The form of sulfur in bauxite varies from place to place. In sedimentary bauxite, sulfur mainly exists in the form of pyrite.

[0004] Sulfur in bauxite primarily exists as pyrite. This sulfur not only causes sodium oxide loss but also corrodes equipment, increases the iron content in the solution, and negatively impacts the quality of the alumina product. Simultaneously, once sulfate concentration in the mother liquor reaches saturation, it crystallizes and precipitates, leading to scaling on equipment surfaces, reducing heat transfer coefficients, and decreasing leaching efficiency. Increased sulfate content also increases the system's salt discharge, thereby increasing energy consumption and production costs.

[0005] The rapid development of my country's aluminum industry has led to a continuous increase in the demand for bauxite, resulting in a continuous decline in bauxite grade. High-sulfur bauxite, due to its high sulfur content, increases alkali consumption, corrodes equipment, reduces heat transfer coefficient, and affects product quality in alumina production, thus failing to be effectively utilized. Summary of the Invention

[0006] The purpose of this invention is to provide a desulfurization method for sedimentary high-sulfur bauxite. This method can not only effectively remove sulfur minerals from sedimentary bauxite and effectively reduce the sulfur content in bauxite, thus providing raw materials for alumina enterprises, but also expand the utilization rate of resources and alleviate the shortage of ore for domestic alumina enterprises, which has important economic and social significance.

[0007] To solve the above technical problems, the present invention adopts the following technical solution:

[0008] The desulfurization method for sedimentary high-sulfur bauxite includes the following steps:

[0009] A. The ore undergoes a first-stage grinding operation. The material obtained from the first-stage grinding has a fineness of 0.074mm and accounts for 30%-60% of the material. Then, a gravity separation operation is performed to obtain a first-stage heavy material and a first-stage light material.

[0010] B. Take the first stage of heavy material and perform a second stage of grinding. The material obtained from the second stage of grinding has a fineness of 0.074mm and accounts for 50%-80% of the material. The material obtained from the second stage of grinding is subjected to 1-2 scavenging operations to separate the second stage of heavy material, which is sulfur concentrate.

[0011] C. Take a section of light material and perform 1-2 fine selection operations to obtain gravity aluminum concentrate. After the gravity aluminum concentrate is concentrated and dehydrated, it is dried and dehydrated. After the dried material is dispersed, it is roasted to obtain aluminum concentrate.

[0012] In this invention, the first-stage and second-stage grinding operations employ rod mills or ball mills. In the first-stage grinding, 30%-60% of the particles are at a fineness of 0.074 mm. This is because the coarser-sized sulfur minerals exhibit good liberation within this grinding fineness range. Increasing the grinding fineness further can lead to over-grinding, causing mineral mud formation, affecting beneficiation indicators, and increasing grinding costs. Conversely, decreasing the grinding fineness results in lower mineral liberation, leading to poor beneficiation and reduced desulfurization efficiency. In the second-stage grinding, 50%-80% of the particles are at a fineness of 0.074 mm. This is because within this grinding fineness range, the finer-sized sulfur minerals can achieve liberation. If the grinding fineness is <50%, mineral liberation is insufficient; if the grinding fineness is >80%, over-grinding is likely to occur, increasing grinding costs.

[0013] In step A, the equipment used for the reselection operation is one of the following: a shaking table, a centrifuge, or a hydrocyclone.

[0014] The process conditions for each piece of equipment in the reselection operation are as follows:

[0015] The lateral slope of the rocking bed surface is 2.0°-3.8°;

[0016] The centrifuge operates at a frequency of 15Hz-40Hz;

[0017] The feed pressure of the hydrocyclone is 0.15MPa-0.22MPa.

[0018] In step C, the equipment used for concentration and dewatering is one of the following: a vibrating dewatering screen, a settling tank, or a plate and frame filter press.

[0019] In step C, the equipment used for drying and dehydration is a low-temperature belt dryer or a rotary dryer.

[0020] The process conditions for each piece of equipment in the drying and dehydration process are as follows:

[0021] The low-temperature belt dryer has a feeding and discharging time of 60s-100s, a feeding interval of 100s-250s, and the moisture content of the dried material is less than 7%.

[0022] The rotary dryer rotates at less than 5 revolutions per minute, and the moisture content of the dried material is less than 7%.

[0023] In step C, the equipment used for decentralized operations is a dry grinding mill.

[0024] The ball-to-material ratio of the dry grinding mill is 1.3-1.6:1.

[0025] In step C, the equipment used for the roasting operation is one of a suspension roasting furnace, a rotary kiln, or a fluidized bed.

[0026] In step C, the roasting temperature is 400℃-1000℃. The roasting temperature of high-sulfur bauxite is controlled between 400℃ and 1000℃. If the roasting temperature is below 400℃, the sulfur content in the bauxite is high, and the sulfur removal effect is poor; if the roasting temperature is above 1000℃, the desulfurization effect is only slightly improved, and the higher the temperature, the greater the energy consumption, the higher the equipment requirements, and the higher the production cost.

[0027] The present invention has the following advantages:

[0028] The method of this invention adopts a combined process of "gravity separation-dispersion-roasting", which can effectively reduce the sulfur content in sedimentary bauxite, making it usable for alumina production.

[0029] Based on the dissemination characteristics of sulfur minerals in high-sulfur bauxite, this invention first employs a single-stage grinding process to dissociate coarsely dissociated sulfur minerals from the bauxite. Secondly, a second-stage grinding process is used to dissociate finely dissociated sulfur minerals, reducing over-grinding and mud formation. Thirdly, the concentrated, dried, and dehydrated gravity-separated bauxite concentrate is further dispersed to break up agglomerated materials during drying, improving roasting efficiency and reducing the sulfur content in the bauxite concentrate. This invention shows promising application prospects. Detailed Implementation

[0030] To facilitate a better understanding of the present invention, the following examples are provided. These examples fall within the scope of protection of the present invention, but do not limit the scope of protection of the present invention.

[0031] Example 1

[0032] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0033] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with a -0.074mm particle size of 30% is obtained. This slurry is then subjected to gravity separation using a shaking table. The gravity separation process consists of one roughing, one cleaning, and two scavenging processes. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, resulting in a fine-grained material with a -0.074mm particle size of 80%. The product from the secondary grinding stage is then subjected to scavenging process one. The heavy material obtained from scavenging process one is then subjected to scavenging process two, and the resulting light material is returned to the roughing stage. The light material obtained from scavenging process two... The material is returned to the scavenging operation, and the heavy material obtained is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation. The heavy material obtained from the cleaning operation is returned to the roughing operation, and the light material obtained is gravity concentrate. The gravity concentrate is concentrated and dehydrated by a vibrating dewatering screen and then dried in a low-temperature belt dryer. The dried material is then dispersed by a dry mill. The dispersed material is then roasted in a suspension roasting furnace at a roasting temperature of 400℃. The product after roasting is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 0.35%.

[0034] The experimental indicators in the above process are shown in Table 1.

[0035] Table 1 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0036] raw ore 100.00 4.00 100.00 Aluminum concentrate 83.58 0.35 7.31 Sulfur concentrate 8.64 40.64 87.78 <![CDATA[SO₂ gas]]> 7.78 2.52 4.90

[0037] Example 2

[0038] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0039] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with a -0.074mm particle size of 40% is obtained. This slurry is then subjected to gravity separation using a centrifuge. The gravity separation process consists of one roughing, one cleaning, and two scavenging stages. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, resulting in a fine-grained material with a -0.074mm particle size of 70%. The product from the secondary grinding stage is then subjected to scavenging stage one. The heavy material obtained from scavenging stage one is then subjected to scavenging stage two, while the lighter material is returned to the roughing stage. The material obtained from scavenging stage two... The light material is returned to the scavenging operation, and the heavy material obtained is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation, and the heavy material obtained from the cleaning operation is returned to the roughing operation, resulting in heavy aluminum concentrate. The heavy aluminum concentrate is concentrated and dehydrated in a settling tank and then dried in a rotary dryer. The dried material is then dispersed in a dry mill, and the dispersed material is roasted in a rotary kiln at a temperature of 600℃. The roasted product is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 0.32%.

[0040] The experimental indicators in the above process are shown in Table 2.

[0041] Table 2 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0042] raw ore 100.00 4.00 100.00 Aluminum concentrate 81.85 0.32 6.55 Sulfur concentrate 8.82 39.73 87.60 <![CDATA[SO₂ gas]]> 9.33 2.51 5.85

[0043] Example 3

[0044] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0045] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with a -0.074mm particle size of 50% is obtained. This slurry is then subjected to gravity separation using a hydrocyclone. The gravity separation process consists of one roughing, one cleaning, and two scavenging stages. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, resulting in a fine-grained material with a -0.074mm particle size of 60%. The product from the secondary grinding stage is then subjected to scavenging stage one. The heavy material obtained from scavenging stage one is then subjected to scavenging stage two, while the lighter material obtained from scavenging stage two is returned to the roughing stage. The material obtained from scavenging stage two... Light material is returned to the scavenging operation, and the resulting heavy material is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation, and the heavy material obtained from the cleaning operation is returned to the roughing operation, resulting in heavy aluminum concentrate. The heavy aluminum concentrate is dehydrated by a plate and frame filter press and then dried in a low-temperature belt dryer. The dried material is then dispersed by a dry mill, and the dispersed material is roasted in a fluidized bed at a temperature of 700℃. The roasted product is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 0.29%.

[0046] The experimental indicators in the above process are shown in Table 3.

[0047] Table 3 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0048] raw ore 100.00 4.00 100.00 Aluminum concentrate 80.98 0.29 5.87 Sulfur concentrate 8.87 39.48 87.55 <![CDATA[SO₂ gas]]> 10.15 2.59 6.58

[0049] Example 4

[0050] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0051] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with 60% of particles having a fineness of -0.074 mm is obtained. This slurry is then subjected to gravity separation using a centrifuge. The gravity separation process consists of one roughing, one cleaning, and two scavenging stages. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, producing a fine-grained material with 50% of particles having a fineness of -0.074 mm. The product from the secondary grinding stage is then subjected to scavenging stage one. The heavy material obtained from scavenging stage one is then subjected to scavenging stage two, and the resulting light material is returned to the roughing stage. The material obtained from scavenging stage two... Light material is returned to the scavenging operation, and the resulting heavy material is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation, and the heavy material obtained from the cleaning operation is returned to the roughing operation, resulting in heavy aluminum concentrate. The heavy aluminum concentrate is concentrated and dehydrated in a settling tank and then dried in a rotary dryer. The dried material is then dispersed in a dry mill, and the dispersed material is roasted in a suspension roaster at a temperature of 800℃. The roasted product is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 0.26%.

[0052] The experimental indicators in the above process are shown in Table 4.

[0053] Table 4 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0054] raw ore 100.00 4.00 100.00 Aluminum concentrate 80.81 0.26 5.25 Sulfur concentrate 8.78 39.81 87.38 <![CDATA[SO₂ gas]]> 10.41 2.83 7.36

[0055] Example 5

[0056] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0057] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with 50% of particles having a fineness of -0.074 mm is obtained. This slurry is then subjected to gravity separation using a hydrocyclone. The gravity separation process consists of one roughing, one cleaning, and two scavenging processes. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, resulting in a fine-grained material with 80% of particles having a fineness of -0.074 mm. The product from the secondary grinding stage is then subjected to scavenging process one. The heavy material obtained from scavenging process one is then subjected to scavenging process two, and the resulting light material is returned to the roughing stage. The light material obtained from scavenging process two... The material is returned to the scavenging operation, and the heavy material obtained is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation. The heavy material obtained from the cleaning operation is returned to the roughing operation, and the light material obtained is gravity concentrate. The gravity concentrate is concentrated and dehydrated by a vibrating dewatering screen and then dried in a low-temperature belt dryer. The dried material is then dispersed by a dry mill. The dispersed material is then roasted in a rotary kiln at a temperature of 1000℃. The roasted product is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 0.24%.

[0058] The test indicators in the above process are shown in Table 5.

[0059] Table 5 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0060] raw ore 100.00 4.00 100.00 Aluminum concentrate 80.29 0.24 4.82 Sulfur concentrate 8.64 40.17 86.77 <![CDATA[SO₂ gas]]> 11.07 3.04 8.42

[0061] Comparative Example 1

[0062] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0063] The sedimentary high-sulfur bauxite ore has a sulfur content of 4%. After a primary grinding process, a slurry with a -0.074mm particle size of 20% is obtained. This slurry is then subjected to gravity separation using a hydrocyclone. The gravity separation process consists of one roughing, one cleaning, and two scavenging stages. The product from the primary grinding stage is used for roughing. The heavy material obtained from the roughing stage is then subjected to a secondary grinding stage, resulting in a fine-grained material with a -0.074mm particle size of 90%. The product from the secondary grinding stage is then subjected to scavenging stage one. The heavy material obtained from scavenging stage one is then subjected to scavenging stage two, and the resulting light material is returned to the roughing stage. The light material obtained from scavenging stage two... The material is returned to the scavenging operation, and the heavy material obtained is sulfur concentrate. The light material obtained from the roughing operation is then processed in the cleaning operation. The heavy material obtained from the cleaning operation is returned to the roughing operation, and the light material obtained is gravity concentrate. The gravity concentrate is concentrated and dehydrated by a vibrating dewatering screen and then dried in a low-temperature belt dryer. The dried material is then dispersed by a dry mill. The dispersed material is then roasted in a suspension roasting furnace at a roasting temperature of 500℃. The product after roasting is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 1.17%.

[0064] The experimental indicators in the above process are shown in Table 6.

[0065] Table 6 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0066] raw ore 100.00 4.00 100.00 Aluminum concentrate 81.26 1.17 23.77 Sulfur concentrate 7.19 39.66 71.29 <![CDATA[SO2 gas]]> 11.55 1.71 4.94

[0067] Comparative Example 2

[0068] A desulfurization method for sedimentary high-sulfur bauxite, the method comprising:

[0069] The sedimentary high-sulfur bauxite has a sulfur content of 4%. After a primary grinding process, a slurry with a -0.074mm particle size of 40% is obtained. This slurry is then subjected to gravity separation using a hydrocyclone. The gravity separation process involves one roughing and two scavenging stages. The product from the primary grinding stage is used for roughing, and the heavy material obtained from the roughing stage undergoes a secondary grinding process to produce a fine-grained material with a -0.074mm particle size of 70%. The product from the secondary grinding stage is then subjected to scavenging stage one, and the heavy material obtained from scavenging stage one is subjected to scavenging stage two. The resulting light material is returned to the coarse grinding stage. The light material obtained from the second scavenging operation is returned to the first scavenging operation, and the heavy material obtained is sulfur concentrate. The light material obtained from the roughing operation is gravity concentrate. The gravity concentrate is concentrated and dehydrated by a vibrating dewatering screen and then dried by a low-temperature belt dryer. The dried material is dispersed by a dry mill, and the dispersed material is roasted in a suspension roasting furnace at a roasting temperature of 300℃. The product after roasting is roasted aluminum concentrate, which is the final aluminum concentrate product. The sulfur content in the final aluminum concentrate is 1.26%.

[0070] The experimental indicators in the above process are shown in Table 7.

[0071] Table 7 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0072]

[0073]

[0074] Comparative Example 3

[0075] This comparative example uses a desulfurization method for sulfur-containing bauxite provided by Chinese invention patent CN117225584A to treat sedimentary high-sulfur bauxite with a sulfur content of 4%, resulting in a bauxite concentrate with a sulfur content of 0.42%.

[0076] The test indicators in the above process are shown in Table 8.

[0077] Table 8 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0078] raw ore 100.00 4.00 100.00 Aluminum concentrate 84.87 0.42 8.91 Sulfur concentrate 15.13 24.08 91.09

[0079] Comparative Example 4

[0080] This comparative example uses a sorting method for high-sulfur bauxite provided by Chinese invention patent CN117101856A to process sedimentary high-sulfur bauxite with a sulfur content of 4%, resulting in a bauxite concentrate with a sulfur content of 0.47%.

[0081] The experimental indicators in the above process are shown in Table 9.

[0082] Table 9 Desulfurization test indicators for sedimentary high-sulfur bauxite mines / %

[0083] raw ore 100.00 4.00 100.00 Aluminum concentrate 83.37 0.47 9.80 Sulfur concentrate 16.63 21.70 90.20

[0084] The desulfurization test results of each embodiment and comparative example are shown in Table 10:

[0085] Table 10 Summary of Test Indicators

[0086]

[0087]

[0088] As can be seen from the table above, the method provided in the embodiments of this application can effectively reduce the sulfur content in aluminum concentrate.

[0089] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0090] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A desulfurization method for sedimentary high-sulfur bauxite, characterized in that, Includes the following steps: A. The ore undergoes a first-stage grinding operation. The material obtained from the first-stage grinding has a fineness of 0.074mm and accounts for 30%-60% of the material. Then, a gravity separation operation is performed to obtain a first-stage heavy material and a first-stage light material. B. Take the first stage of heavy material and perform a second stage of grinding. The material obtained from the second stage of grinding has a fineness of 0.074mm and accounts for 50%-80%. The material obtained from the second stage of grinding is subjected to 1-2 scavenging operations to separate the second stage of heavy material, which is sulfur concentrate. C. Take a section of light material and perform 1-2 fine selection operations to obtain gravity aluminum concentrate. After the gravity aluminum concentrate is concentrated and dehydrated, it is dried and dehydrated. After the dried material is dispersed, it is roasted to obtain aluminum concentrate.

2. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: In step A, the equipment used for the reselection operation is one of the following: a shaking table, a centrifuge, or a hydrocyclone.

3. The desulfurization method for sedimentary high-sulfur bauxite according to claim 2, characterized in that: The process conditions for each piece of equipment in the reselection operation are as follows: The lateral slope of the rocking bed surface is 2.0°-3.8°; The centrifuge operates at a frequency of 15Hz-40Hz; The feed pressure of the hydrocyclone is 0.15MPa-0.22MPa.

4. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: In step C, the equipment used for concentration and dewatering is one of the following: a vibrating dewatering screen, a settling tank, or a plate and frame filter press.

5. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: In step C, the equipment used for drying and dehydration is a low-temperature belt dryer or a rotary dryer.

6. The desulfurization method for sedimentary high-sulfur bauxite according to claim 5, characterized in that: The process conditions for each piece of equipment in the drying and dehydration process are as follows: The low-temperature belt dryer has a feeding and discharging time of 60s-100s, a feeding interval of 100s-250s, and the moisture content of the dried material is less than 7%. The rotary dryer rotates at less than 5 revolutions per minute, and the moisture content of the dried material is less than 7%.

7. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: In step C, the equipment used for decentralized operations is a dry grinding mill.

8. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: The ball-to-material ratio of the dry grinding mill is 1.3-1.6:

1.

9. The desulfurization method for sedimentary high-sulfur bauxite according to claim 1, characterized in that: In step C, the equipment used for the roasting operation is one of a suspension roasting furnace, a rotary kiln, or a fluidized bed.

10. The desulfurization method for sedimentary high-sulfur bauxite according to claim 9, characterized in that: In step C, the roasting temperature is 400℃-1000℃.

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