CN113880122A - Method for preparing fine ore from bauxite - Google Patents
Method for preparing fine ore from bauxite Download PDFInfo
- Publication number
- CN113880122A CN113880122A CN202111193857.6A CN202111193857A CN113880122A CN 113880122 A CN113880122 A CN 113880122A CN 202111193857 A CN202111193857 A CN 202111193857A CN 113880122 A CN113880122 A CN 113880122A
- Authority
- CN
- China
- Prior art keywords
- ore
- bauxite
- fine ore
- percent
- raw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 239000011593 sulfur Substances 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 16
- 239000012141 concentrate Substances 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
- C01F7/023—Grinding, deagglomeration or disintegration
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of bauxite preparation, and particularly relates to a method for preparing fine ore powder from bauxite. The method comprises the following steps: (1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore; (2) grinding the dry lump ore obtained in the step (1) to ensure that the fineness of the ore reaches 100 mu m and accounts for 70-80 percent, thus obtaining raw powder ore; (3) and (3) sequentially preheating the raw fine ore obtained in the step (2) in a low-temperature system at 300-400 ℃ and roasting in a medium-high temperature system at 600-950 ℃, and removing moisture, sulfur and organic carbon in the raw fine ore to obtain fine ore. The preparation process disclosed by the invention is simple in flow, easy to operate and manage, and capable of rapidly and synchronously removing various impurities in the ore, so that the quality of the ore product is improved.
Description
Technical Field
The invention belongs to the technical field of bauxite preparation, and particularly relates to a method for preparing fine ore powder from bauxite.
Background
90% of bauxite in China is used as a raw material for producing alumina, low-sulfur bauxite in a shallow part tends to be exhausted along with continuous development and utilization of bauxite resources, and bauxite purchased in an alumina plant at present is mostly a mixed ore of low-sulfur raw ore and high-sulfur raw ore or a flotation desulfurization concentrate. However, the water content, the sulfur content and the organic matter content of the mined raw ore complex ore and the flotation desulfurization concentrate are high, so that the alkali consumption, the evaporation energy consumption and the like of the alumina production can be greatly increased, and the production cost is increased.
Disclosure of Invention
The invention aims to provide a preparation method of high-quality bauxite concentrate, which is used for preparing high-quality bauxite concentrate with high water content, high sulfur content and high carbon content into high-quality bauxite concentrate with no water content, low sulfur content of less than 0.1% and low organic carbon content of less than 0.3%.
The technical scheme is as follows:
a method for preparing concentrate from bauxite comprises the following steps:
(1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore;
(2) and (2) grinding the dry lump ore obtained in the step (1) to ensure that the fineness of the ore reaches 100 mu m and accounts for 70-80 percent, thus obtaining the original fine ore.
(3) And (3) preheating the raw fine ore obtained in the step (2) in a low-temperature system at 300-400 ℃ and roasting in a medium-high temperature system at 600-950 ℃ in sequence, removing harmful components such as moisture, sulfur, organic carbon and the like in the raw fine ore, and improving the grade of alumina to obtain fine ore.
The obtained fine ore comprises the following main components in percentage by weight: al (Al)2O3 52～67％、SiO210-17%, sulfur 0.01-0.1%, water content less than 0.1%, and organic carbon content 0.2-0.3%.
The preparation process disclosed by the invention is simple in flow, easy to operate and manage, and capable of rapidly and synchronously removing various impurities in the ore, so that the quality of the ore product is improved.
The obtained fine ore has the following advantages:
1. the sulfur content is greatly reduced compared with the traditional ore products, so that the alkali consumption in alumina production can be effectively reduced, the production efficiency is improved, compared with the ore containing 0.5 percent of sulfur, the alkali consumption in alumina production per ton is reduced by 12.5kg, and the production cost is reduced by 50 yuan; meanwhile, the sedimentation performance of the red mud is improved, the consumption of a flocculating agent is reduced, the production cost of the alumina is uniformly distributed, and 3-5 yuan/ton can be reduced.
2. The aluminum mineral and the silicon mineral in the product are activated, the dissolution rate of the alumina is improved by 3-5%, the yield of 100 ten thousand tons of alumina production lines per year is increased by 3.5 ten thousand tons, the profit is increased by 1750 ten thousand yuan, the production cost of the alumina is uniformly shared, and the yield can be reduced by 17.5 yuan/ton.
3. The organic carbon content is reduced, the organic matter treatment cost of a production system can be reduced, the production cost of the alumina is uniformly shared, and 4-6 yuan/ton can be reduced.
4. The product is dry powder ore, and the subsequent drying and grinding cost is saved by 25-35 yuan/ton.
5、Al2O3The percentage grade is improved by 2-5%, and the value of each ton of ore is improved by 16-40 yuan.
6. The moisture in the ore is removed, the evaporation capacity of an alumina production system is reduced, the production cost of the alumina is uniformly shared, and 1-2 yuan/ton can be reduced.
7. The steam consumption of alumina plant is reduced, about 0.1t, and the cost is saved by 0.1 multiplied by 150 to 15 yuan calculated by steam price per t.
8. The discharge of the red mud is reduced by 30kg, and the cost is saved by 45 yuan (10 yuan/t for filter pressing, 20 yuan/t for damming and 15 yuan/t for stockpiling) per ton of red mud, namely 45 multiplied by 0.03 to 1 yuan.
Detailed Description
The technical problems, aspects and advantages of the invention will be apparent from and elucidated with reference to an exemplary embodiment. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The nature of the description is merely to assist those skilled in the relevant art in a comprehensive understanding of the specific details of the invention.
The invention is further illustrated by the following specific examples.
Example 1
A bauxite ore product and a method of making the same, comprising the steps of:
(1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore;
(2) grinding the dry lump ore obtained in the step (1) to ensure that the fineness of the ore reaches 100 mu m and accounts for 75 percent, thus obtaining raw powder ore;
(3) and (3) preheating the raw fine ore obtained in the step (2) in a low-temperature system at 300 ℃ and roasting the raw fine ore in a medium-high temperature system at 600 ℃ in sequence, removing harmful components such as moisture, sulfur, organic carbon and the like in the raw fine ore, and improving the grade of alumina to obtain fine ore.
Example 2
A bauxite ore product and a method of making the same, comprising the steps of:
(1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore;
(2) grinding the dry lump ore obtained in the step (1) to ensure that the fineness of the ore reaches 100 mu m and accounts for 75 percent, thus obtaining raw powder ore;
(3) and (3) preheating the raw fine ore obtained in the step (2) in a 350 ℃ low-temperature system and roasting in a 800 ℃ medium-high temperature system in sequence, removing harmful components such as water, sulfur, organic carbon and the like in the raw fine ore, and improving the grade of alumina to obtain fine ore.
Example 3
A bauxite ore product and a method of making the same, comprising the steps of:
(1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore;
(2) grinding the dry lump ore obtained in the step (1) to enable the fineness of the ore to reach 100 mu m and account for 80 percent, and obtaining raw powder ore;
(3) and (3) preheating the raw fine ore obtained in the step (2) in a low-temperature system at 400 ℃ and roasting the raw fine ore in a medium-high temperature system at 950 ℃, removing harmful components such as water, sulfur, organic carbon and the like in the raw fine ore, and improving the grade of alumina to obtain fine ore.
The fine ore obtained by the above examples 1 to 3 comprises the following main components in percentage by weight: al (Al)2O3 52～67％、SiO210-17%, sulfur 0.01-0.1%, water content less than 0.1%, organic carbon content 0.2-0.3%
Experiment 1
Using Al2O3Drying low-grade ore raw materials with the grade of 52.56 percent, the S content of 3.9 percent, the water content of 10 percent and the organic carbon content of 0.65 percent, reducing the water content to 4.8 percent, and then grindingTo 100 μm, 75% fine ore, preheating, and treating at 650 deg.C to obtain Al2O3The bauxite ore product with the grade of 54.62 percent, the S content of 0.08 percent, the organic carbon content of 0.26 percent and the water content of 0 percent.
Experiment 2
Using Al2O3The method comprises the following steps of drying a medium-low grade ore raw material with the grade of 62.48%, the S content of 1.05%, the water content of 8% and the organic carbon content of 0.82%, reducing the water content to 3.6%, grinding the raw material to obtain powder ore with the particle size of-100 mu m and the content of 78%, preheating the powder ore, and processing the powder ore at the temperature of 900 ℃ to obtain Al2O3The bauxite ore product with the grade of 67.59 percent, the S content of 0.015 percent, the organic carbon content of 0.2 percent and the water content of 0 percent.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A method for preparing fine ore from bauxite is characterized by comprising the following steps:
(1) drying the bauxite to reduce the moisture content of the bauxite to be less than 5 percent to obtain dry lump ore;
(2) grinding the dry lump ore obtained in the step (1) to ensure that the fineness of the ore reaches 100 mu m and accounts for 70-80 percent, thus obtaining raw powder ore;
(3) and (3) sequentially preheating the raw fine ore obtained in the step (2) in a low-temperature system at 300-400 ℃ and roasting in a medium-high temperature system at 600-950 ℃, and removing moisture, sulfur and organic carbon in the raw fine ore to obtain fine ore.
2. The method for preparing fine ore from bauxite according to claim 1, characterized in that: the obtained fine ore comprises the following main components in percentage by weight: al (Al)2O3 52～67％、SiO210-17%, sulfur 0.01-0.1%, water content less than 0.1%, and organic carbon content 0.2-0.3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193857.6A CN113880122A (en) | 2021-10-13 | 2021-10-13 | Method for preparing fine ore from bauxite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193857.6A CN113880122A (en) | 2021-10-13 | 2021-10-13 | Method for preparing fine ore from bauxite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113880122A true CN113880122A (en) | 2022-01-04 |
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ID=79002727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111193857.6A Pending CN113880122A (en) | 2021-10-13 | 2021-10-13 | Method for preparing fine ore from bauxite |
Country Status (1)
| Country | Link |
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| CN (1) | CN113880122A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008100427A4 (en) * | 2008-03-05 | 2008-07-03 | Central South Univeristy | Efficient separation method for low grade complex iron ore |
| CN105562212A (en) * | 2015-03-18 | 2016-05-11 | 遵义能矿投资股份有限公司 | Method for desilication and desulfuration of sulfur-containing bauxite by floating |
| CN108726545A (en) * | 2017-04-20 | 2018-11-02 | 中国科学院过程工程研究所 | A kind of impurity-removing method of middle-low bauxite |
| CN210560642U (en) * | 2019-07-30 | 2020-05-19 | 遵义能矿投资股份有限公司 | High-sulfur bauxite resource recycling system |
| CN210559427U (en) * | 2019-07-30 | 2020-05-19 | 遵义能矿投资股份有限公司 | High-sulfur bauxite desulfurization and waste gas acid-making system |
| CN111484054A (en) * | 2019-01-25 | 2020-08-04 | 遵义能矿投资股份有限公司 | Treatment method of refractory bauxite desulfuration active silicon and active aluminum |
| CN111593197A (en) * | 2020-05-29 | 2020-08-28 | 东北大学 | Method for removing iron from bauxite by suspension roasting dehydration dry method |
| US20210147959A1 (en) * | 2021-01-29 | 2021-05-20 | Separation Technologies Llc | Process for dry beneficiation of bauxite minerals by electrostatic segregation |
-
2021
- 2021-10-13 CN CN202111193857.6A patent/CN113880122A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008100427A4 (en) * | 2008-03-05 | 2008-07-03 | Central South Univeristy | Efficient separation method for low grade complex iron ore |
| CN105562212A (en) * | 2015-03-18 | 2016-05-11 | 遵义能矿投资股份有限公司 | Method for desilication and desulfuration of sulfur-containing bauxite by floating |
| CN108726545A (en) * | 2017-04-20 | 2018-11-02 | 中国科学院过程工程研究所 | A kind of impurity-removing method of middle-low bauxite |
| CN111484054A (en) * | 2019-01-25 | 2020-08-04 | 遵义能矿投资股份有限公司 | Treatment method of refractory bauxite desulfuration active silicon and active aluminum |
| CN210560642U (en) * | 2019-07-30 | 2020-05-19 | 遵义能矿投资股份有限公司 | High-sulfur bauxite resource recycling system |
| CN210559427U (en) * | 2019-07-30 | 2020-05-19 | 遵义能矿投资股份有限公司 | High-sulfur bauxite desulfurization and waste gas acid-making system |
| CN111593197A (en) * | 2020-05-29 | 2020-08-28 | 东北大学 | Method for removing iron from bauxite by suspension roasting dehydration dry method |
| US20210147959A1 (en) * | 2021-01-29 | 2021-05-20 | Separation Technologies Llc | Process for dry beneficiation of bauxite minerals by electrostatic segregation |
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