CN116041985A - Energy-saving production method of superfine calcined kaolin - Google Patents
Energy-saving production method of superfine calcined kaolin Download PDFInfo
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- CN116041985A CN116041985A CN202310009295.8A CN202310009295A CN116041985A CN 116041985 A CN116041985 A CN 116041985A CN 202310009295 A CN202310009295 A CN 202310009295A CN 116041985 A CN116041985 A CN 116041985A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000005995 Aluminium silicate Substances 0.000 title claims abstract description 28
- 235000012211 aluminium silicate Nutrition 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000001238 wet grinding Methods 0.000 claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 9
- 239000011819 refractory material Substances 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003546 flue gas Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000018044 dehydration Effects 0.000 claims abstract description 5
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 4
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 4
- 239000002918 waste heat Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 238000001704 evaporation Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
- C09C1/405—Compounds of aluminium containing combined silica, e.g. mica
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/041—Grinding
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/043—Drying, calcination
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an energy-saving production method of superfine calcined kaolin, which comprises the following process steps: the first step: in the grinding stage of the coal gangue kaolin, the roller grinding pressure is increased to 8.5Mpa, so that the fineness of the powder is stabilized between 325 meshes and 400 meshes; and a second step of: in the slurry preparation stage, water at 50 ℃ is cooled by adopting a calcination link to increase the temperature of the prepared slurry; and a third step of: in the wet grinding stage, two grinding machines and a centrifugal classification device are matched for wet grinding; fourth step: in the drying stage, a plate filter press is adopted to reduce the moisture of the slurry to 30% after the slurry is subjected to filter pressing and dehydration, and then the slurry is dried by hot air at 650 ℃ of a drying crusher; fifth step: and a sixth step of adjusting the refractory material in the rotary kiln to mullite refractory material with cordierite content of 10% and alumina content of 35%: and in the breaking-up and depolymerizing stage, the heated flue gas is assisted in heating. Realizes the low-cost energy-saving production of the superfine powder of the coal gangue kaolin, thereby effectively reducing the energy consumption in the production process of the superfine powder of the coal gangue kaolin.
Description
Technical Field
The invention relates to the technical field of coal gangue kaolin production, in particular to an energy-saving production method of superfine calcined kaolin.
Background
The gangue calcined kaolin is used as an important functional pigment and filler in the paint and paper industry. The coal gangue kaolinite has high hardness, and the superfine grinding treatment process consumes large amounts of water, electricity and gas. The domestic traditional production process comprises dry grinding, wet grinding, spray drying, depolymerization scattering and calcining, and is relatively mature, but the problem of high energy consumption in the whole production process is faced, and the method cannot adapt to the energy-saving and environment-friendly requirements and the downstream market cost pressure. In order to greatly push the utilization rate of the solid waste of the coal gangue, enterprises excessively pursue the utilization amount of the coal gangue in recent years, and the problem of high energy consumption in the production process of the coal gangue is ignored.
Disclosure of Invention
The invention aims to provide an energy-saving production method of superfine calcined kaolin, which solves the problem of high energy consumption in the traditional kaolin production process.
In order to achieve the above purpose, the present invention provides the following technical solutions: an energy-saving production method of superfine calcined kaolin comprises the following process steps:
the first step: in the grinding stage of the coal gangue kaolin, the roller grinding pressure is increased to 8.5Mpa, so that the fineness of the powder is stabilized between 325 meshes and 400 meshes;
and a second step of: in the slurry preparation stage, water at 50 ℃ is cooled by adopting a calcination link to increase the temperature of the prepared slurry;
and a third step of: in the wet grinding stage, two grinding machines and a centrifugal classification device are matched for wet grinding;
fourth step: in the drying stage, a plate filter press is adopted to reduce the moisture of the slurry to 30% after the slurry is subjected to filter pressing and dehydration, and then the slurry is dried by hot air at 650 ℃ of a drying crusher;
fifth step: in the calcination stage, the refractory material in the rotary kiln is adjusted to mullite refractory material with cordierite content of 10% and alumina content of 35%; supplementing waste heat wind of combustion-supporting wind of the rotary kiln;
sixth step: and in the breaking-up and depolymerizing stage, the heated flue gas is assisted in heating.
Optionally, in the third step, two mills are connected in series and then connected with a horizontal centrifuge, and the installed power is 560kw. The centrifugal classification equipment is a horizontal centrifuge.
Optionally, in the fourth step, the materials are processed by a filter pressing dehydrator, a slitting crusher, a belt conveyor and a drying crusher in sequence.
Optionally, in the fifth step, the temperature of the residual hot air is 200 DEG C
Optionally, in the sixth step, the flue gas temperature is 60 ℃.
The invention has the following technical effects: the invention surrounds coal gangue kaolin resources, comprehensively utilizes energy-saving production technology, and aims at solving the problems of large water consumption, power consumption and fuel consumption in the existing coal gangue kaolin superfine powder production process, and the problems of large energy consumption characteristics of each processing ring and large energy consumption difference in the process are analyzed. The method realizes low-cost and energy-saving production of the superfine powder of the coal gangue kaolin by controlling the dry powder grinding parameters, slurry preparation and energy saving, wet grinding process route, novel drying, efficient calcination, wen Dasan addition and waste heat recovery modes, thereby effectively reducing the energy consumption in the production process of the superfine powder of the coal gangue kaolin.
Drawings
FIG. 1 is a schematic diagram of the connection of a mill and a horizontal centrifuge in an embodiment;
fig. 2 is a schematic diagram showing connection of the drying apparatus in the embodiment.
Reference numerals: 1. a grinding machine; 2. a horizontal centrifuge; 3. a press filtration dehydrator; 31. a slitter breaker; 32. a belt conveyor; 33. and (5) drying the crusher.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1 and 2, the embodiment discloses an energy-saving production method of superfine calcined kaolin, which comprises the following process steps:
the first step: in the grinding stage of the coal gangue kaolin, the roller grinding pressure is increased to 8.5Mpa, so that the fineness of the powder is stabilized between 325 meshes and 400 meshes; specifically, the vertical roller mill pressure is increased to process by adopting a high-pressure grinding process, the pressurization is performed by using a hydraulic oil station, 15% of the original grinding roller pressure is improved, the productivity in the link is improved by 5T/h, and the power consumption is reduced by 30 degrees/hour.
And a second step of: in the slurry preparation stage, water at 50 ℃ is cooled by adopting a calcination link to increase the temperature of the prepared slurry; the original running water slurry preparation mode at 20 ℃ is changed, the initial energy of the slurry in the wet grinding link is increased, and the productivity is improved by 0.1T/h and the power consumption is reduced by 5 degrees/h under the same grinding fineness standard.
And a third step of: in the wet grinding stage, two grinding machines 1 and a centrifugal classification device are matched for wet grinding; the setting changes the production line of original 4 mills 1 series production, the original motor power reaches 600kw, the energy consumption is large, the embodiment realizes that the productivity is not changed under the condition that the fineness is not less than 86% standard according to 2 mills and 1 classification equipment by means of centrifugal classification equipment and particle separation technology, and reduces the power consumption by 100kw.h per hour. The extension equipment adopts a horizontal centrifuge 2.
Fourth step: in the drying stage, a plate filter press is adopted to reduce the moisture of the slurry to 30% after the slurry is subjected to filter pressing and dehydration, and then the slurry is dried by hot air at 650 ℃ of a drying crusher;
in the original process, 50 yuan/T of fuel gas cost is consumed by spraying and drying 50% of water slurry and evaporating 50% of water at the inlet air temperature of 650 ℃; the drying of the embodiment reduces the evaporation water amount by 200kg per ton of product, and the fuel gas consumption cost is reduced by 20 yuan/T.
Fifth step: in the calcination stage, the refractory material in the rotary kiln is adjusted to mullite refractory material with cordierite content of 10% and alumina content of 35%; the arrangement ensures that the heat conductivity coefficient is lower than 0.5W/m.K, the temperature of the outer wall is reduced by 10 ℃, and the heat energy utilization rate is improved; the waste heat wind of the combustion-supporting wind of the rotary kiln is used for supplementing, so that the ineffective utilization is reduced, and the heat energy generated by the fuel is ensured to be completely used for decarburizing and dehydrating the gangue materials.
Sixth step: and in the breaking-up and depolymerizing stage, the heated flue gas is assisted in heating. Improving the polymerization knowing and scattering capability, improving the productivity of a single device by 0.1T/h and reducing the electricity consumption cost by 2 yuan/ton.
In the energy-saving production method of the embodiment, in the third step, two grinders 1 are connected in series and then connected with a horizontal centrifuge 2, and the installed power is 560kw.
In the energy-saving production method of the present embodiment, in the fourth step, the material is processed sequentially by the press-filter dehydrator 3, the slitter-crusher 31, the belt conveyor 32 and the drying crusher 33. The filter press dehydrator 3 is a plate filter press.
In the energy-saving production method of the embodiment, in the fifth step, the temperature of the residual hot air is 200 DEG C
In the energy-saving production method of the embodiment, in the sixth step, the temperature of the flue gas is 60 ℃.
The beneficial effects of this embodiment are as follows:
in the scheme for reducing the energy consumption of the production of the superfine powder of the coal gangue kaolin in the embodiment, the pressure is increased through a vertical mill, the single-machine single-time comprehensive productivity is improved, and the electric quantity consumption is reduced. The equipment starting operation efficiency is improved through warm water slurry preparation at 50 ℃, and the ineffective electric energy consumption is saved; the overall installed power of the mill is reduced through a grinding and grading combined mode, and electric energy reduction is realized; the water content of the slurry is reduced, the evaporation capacity is reduced, and the reduction of the fuel energy consumption is realized through a novel dehydration and drying process; the heat insulation material of the rotary kiln is controlled to be combined with combustion-supporting hot air, so that the heat utilization rate is improved, the heat loss is reduced, and the waste heat utilization rate is improved; and the waste heat wind of the scattering machine is introduced, so that the scattering efficiency is improved, the single machine productivity is improved, and the power consumption is reduced. Finally, the energy consumption of the whole single ton product is reduced to 210tce/T from 240 tce/T. Provides technical possibility for the green low-carbon production of the superfine powder of the coal gangue kaolin, and improves the technical overall level and the competitiveness of the coal gangue kaolin material industry.
The following table shows the scheme and effect comparison of the present example with the original process:
the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and the various changes are included in the scope of the present invention.
Claims (5)
1. The energy-saving production method of the superfine calcined kaolin is characterized by comprising the following process steps of:
the first step: in the grinding stage of the coal gangue kaolin, the roller grinding pressure is increased to 8.5Mpa, so that the fineness of the powder is stabilized between 325 meshes and 400 meshes;
and a second step of: in the slurry preparation stage, water at 50 ℃ is cooled by adopting a calcination link to increase the temperature of the prepared slurry;
and a third step of: in the wet grinding stage, two grinding machines (1) and a centrifugal classification device are matched for wet grinding;
fourth step: in the drying stage, a plate filter press is adopted to reduce the moisture of the slurry to 30% after the slurry is subjected to filter pressing and dehydration, and then the slurry is dried by hot air at 650 ℃ of a drying crusher;
fifth step: in the calcination stage, the refractory material in the rotary kiln is adjusted to mullite refractory material with cordierite content of 10% and alumina content of 35%; supplementing waste heat wind of combustion-supporting wind of the rotary kiln;
sixth step: and in the breaking-up and depolymerizing stage, the heated flue gas is assisted in heating.
2. The energy-saving production method of superfine calcined kaolin according to claim 1, characterized in that in the third step, two mills (1) are connected in series and then connected with a horizontal centrifuge (2), and the installed power is 560kw.
3. The energy-saving production method of ultrafine calcined kaolin according to claim 1, wherein in the fourth step, the material is processed by a press-filter dehydrator (3), a slitting breaker (31), a belt conveyor (32) and a drying breaker (33) in sequence.
4. The energy-saving production method of superfine calcined kaolin according to claim 1, wherein in the fifth step, the temperature of the residual hot air is 200 ℃.
5. The energy-saving production method of ultrafine calcined kaolin according to claim 1, wherein in the sixth step, the flue gas temperature is 60 ℃.
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| CN202310009295.8A CN116041985A (en) | 2023-01-04 | 2023-01-04 | Energy-saving production method of superfine calcined kaolin |
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| CN202310009295.8A CN116041985A (en) | 2023-01-04 | 2023-01-04 | Energy-saving production method of superfine calcined kaolin |
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2023
- 2023-01-04 CN CN202310009295.8A patent/CN116041985A/en active Pending
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| 冯平仓: "煤系锻烧高岭土超细加工工艺探讨", 非金属矿, no. 04, pages 56 - 58 * |
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