CN111729728A - Novel dry method white cement raw material preparation device and process - Google Patents

Novel dry method white cement raw material preparation device and process Download PDF

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Publication number
CN111729728A
CN111729728A CN202010654787.9A CN202010654787A CN111729728A CN 111729728 A CN111729728 A CN 111729728A CN 202010654787 A CN202010654787 A CN 202010654787A CN 111729728 A CN111729728 A CN 111729728A
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raw material
grinding
roller mill
silicon
white cement
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秦中华
刘迪
马娇媚
李波
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Tianjin Cement Industry Design and Research Institute Co Ltd
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Tianjin Cement Industry Design and Research Institute Co Ltd
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Priority to CN202010654787.9A priority Critical patent/CN111729728A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention belongs to the technical field of white portland cement, and particularly relates to a novel dry method white cement raw material preparation device and a process, wherein the novel dry method white cement raw material preparation device comprises a silicon-aluminum raw material grinding system and a calcium raw material grinding system, the silicon-aluminum raw material grinding system is used for grinding a silicon-aluminum raw material with poor grindability, and the calcium raw material grinding system is used for grinding and sorting a calcium raw material with good grindability and mixing the calcium raw material with a qualified fineness silicon-aluminum raw material ground by the silicon-aluminum raw material grinding system. The invention provides a novel dry method white cement raw material preparation device and a novel dry method white cement raw material preparation process, which can improve the quality of raw material finished products, and have stable raw material components, low system energy consumption and low heat consumption.

Description

Novel dry method white cement raw material preparation device and process
Technical Field
The invention belongs to the technical field of white portland cement, and particularly relates to a novel dry method white cement raw material preparation device and process.
Background
The prior art and the defects are as follows:
the production process of white portland cement clinker is very different from the production process of ordinary gray cement clinker, and compared with ordinary portland cement, such as limestone ore dressing, raw material preparation, clinker bleaching, clinker grinding and cement packaging, the production process of white portland cement clinker has characteristics in both process flow and equipment type selection.
The general design principle of the white portland cement production line is as follows: reduce the pollution of non-ferrous metal elements to the maximum extent, and strictly control MgO and SO in clinker components3And Fe2O3Content, obtaining the white cement clinker with high whiteness and strength. The key of the raw material preparation system is that the prepared raw material finished product meets the calcination requirement of burning, and the iron pollution in the grinding process is reduced to the maximum extent.
The traditional preparation process of white cement raw materials has two types: a preparation process of raw materials for mixed powder grinding, and a preparation process of dry-wet combined raw materials. The mixed grinding process includes mixing the materials in certain ratio, and grinding and selecting in a vertical mill or ball mill system to produce qualified raw material product. When the traditional mixed grinding process is adopted to prepare raw materials, the following problems exist: the difference of grindability of different raw materials is large, when the raw materials are ground to a certain fineness, the calcium raw materials such as limestone and the like are mainly concentrated in a fine particle part, and the silicon raw materials such as quartz sand and the like are mainly concentrated in a coarse particle part in terms of the distribution of raw material components. In the subsequent calcining process, the reaction speed is inversely proportional to the particle size R2, so the reaction speed and the reaction completeness of the raw materials in the kiln system are influenced by the particle size of siliceous raw materials such as quartz sand, and further the yield of the kiln system and the quality of white cement clinker are influenced.
The dry-wet combined raw material preparation process is a process of respectively grinding two materials with large difference of grindability, namely, grinding the calcium raw materials with good grindability such as limestone by using a dry roller mill, and independently grinding the silicon-aluminum raw materials with poor grindability by using a roller press and a wet ball mill. And (3) injecting slurry formed by wet grinding into the roller mill, mixing with other raw materials, and drying to produce a qualified raw material finished product. When the dry-wet combined grinding process is adopted to prepare the raw material, the following problems exist: when the siliceous raw materials are ground by wet ball milling, the power consumption of a grinding system is high and the energy consumption is large; secondly, the water content of the slurry discharged from the wet ball milling is over 45 percent, so that the comprehensive grinding water content is up to more than 15 percent, a large amount of heat is consumed to dry the materials, and the heat consumption is large; and thirdly, due to the large water content and poor dispersibility of the slurry, the slurry is difficult to be fully mixed with other dry materials, so that the raw material components are unstable, the fluctuation is large, and the subsequent calcining process and the clinker quality are influenced. Fourthly, the process flow is complex.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the novel dry method white cement raw material preparation device and the process which can improve the quality of raw material finished products, have stable raw material components, low system energy consumption and low heat consumption have important practical significance.
Disclosure of Invention
The invention aims to provide a novel dry method white cement raw material preparation device and a novel dry method white cement raw material preparation process, which can improve the quality of raw material finished products, stabilize raw material components, and have low system energy consumption and low heat consumption.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
the utility model provides a novel dry process white cement raw material preparation facilities, novel dry process white cement raw material preparation facilities includes silicon aluminium matter raw materials grinding system and calcareous material grinding system, silicon aluminium matter raw materials grinding system carries out the grinding to easy poor silicon aluminium matter raw materials of grindability, calcareous material grinding system carries out grinding and selects separately easy good calcareous raw materials of grindability to with qualified fineness silicon aluminium matter raw materials after silicon aluminium matter raw materials grinding system grinds mixes.
The method is characterized in that the easily ground calcium raw materials (limestone and the like) and the easily ground silica-alumina raw materials (quartz sandstone, pyrophyllite and the like) are respectively dried and ground by two sets of grinding systems and equipment instead of mixed grinding, so that the content of the easily ground silica-alumina raw materials and the like in the finished coarse particles is reduced, the over-grinding phenomenon of the easily ground calcium raw materials and the like is avoided, and the power consumption of the grinding systems is reduced. The raw materials with the two proper finenesses can be mixed to prepare the high-quality raw material.
The invention can also adopt the following technical scheme:
in the novel dry method white cement raw material preparation device, the qualified fineness of the alumino-silicate raw material is fed into a shell of a powder concentrator of the calcareous raw material grinding system.
The silicon-aluminum raw material with qualified fineness is fed into a shell of a powder selecting machine of a calcium raw material grinding system. Under the action of airflow rotating at high speed at the outlet of the powder concentrator, the silicon-aluminum raw material is fully mixed with calcium with qualified fineness and other materials with good grindability, a material mixing device is omitted, and the system process is simplified. Meanwhile, the silicon-aluminum raw material with qualified fineness is fed into a shell of a powder selecting machine of the calcium raw material grinding equipment instead of a grinding disc of the grinding equipment, so that the over-grinding phenomenon of the silicon-aluminum raw material is avoided, the problems of vibration increase of the grinding equipment and the like caused by feeding of a powdery material into the grinding disc are avoided, and the production efficiency is improved to the maximum extent.
In the novel dry method white cement raw material preparation device, further, an included angle of 8-10 degrees is formed between the grinding area at the center of the grinding disc of the roller mill A of the silicon-aluminum raw material grinding system and the horizontal direction, and a horizontal grinding disc is still adopted in the edge grinding area.
If the silico-aluminous raw material and the calcareous raw material are mixed and ground to the required fineness, the product fineness of the silico-aluminous raw material reaches or even exceeds the fineness of the ordinary portland cement. The grinding disc center grinding area of the grinding equipment with poor grindability, such as the silicon-aluminum raw material, has an included angle of 8-10 degrees with the horizontal direction, and the edge grinding area still adopts a horizontal grinding disc, so that the retention time of materials in the grinding machine is prolonged, the adaptability and the grinding efficiency to different materials are improved, and the system circulation load is reduced.
In the above apparatus for preparing white cement raw material by dry method, further, the grinding system for alumino-silicate raw material comprises: a siliceous raw material storage bin, a weigher A arranged below the siliceous raw material storage bin, an aluminum raw material storage bin, a weigher B arranged below the aluminous raw material storage bin, a roller mill A, a lifting machine A, a cyclone cylinder A, a circulating fan A, a dust collector A, a system fan A, a finished product conveying chute A, a calcareous raw material fine powder storage bin, a weigher E and a lifting machine A;
the discharge ports of the metering scale A and the metering scale B are communicated with the feed port of the roller mill A, the discharge port of the roller mill A is connected with a cyclone cylinder A, the air outlet of the cyclone cylinder A is connected with a dust collector A through a circulating fan A, the air outlet of the dust collector A exhausts air through a system fan A, a finished product conveying chute A is arranged below the discharge port at the bottom of the dust collector A and the discharge port at the bottom of the cyclone cylinder A, the tail end of the finished product conveying chute A is connected with the fine powder storage bin of the raw materials, a metering scale E is arranged below the fine powder storage bin of the raw materials, one end of a lifter A is connected with the slag discharge port of the roller mill A, and the other end of;
the calcareous raw material grinding system comprises: a limestone raw material storage bin, a metering scale C arranged below the limestone raw material storage bin, other raw material storage bins, a metering scale D arranged below the limestone raw material storage bin, a roller mill B, a lifting machine B, a cyclone cylinder B, a circulating fan B, a dust collector B, a system fan B, a finished product conveying chute B and a lifting machine B;
the discharge ports of the metering scale C, the metering scale D and the metering scale E are communicated with a feed port of the roller mill B, the discharge port of the roller mill B is connected with the cyclone cylinder B, the other end of the roller mill B is connected with a feed belt of the roller mill B, an air outlet of the cyclone cylinder B is connected with the dust collector B through the circulating fan B, an air outlet of the dust collector B exhausts air through the system fan B, a finished product conveying chute B is arranged below a bottom discharge port of the dust collector B and a bottom discharge port of the cyclone cylinder B, the tail end of the finished product conveying chute B is communicated with a raw material warehouse, and one end of the elevator B is connected with a slag discharge port of the.
The grinding equipment adopts a roller mill, so that the grinding efficiency is high, the drying capacity is strong, and the power consumption of a grinding system is reduced.
In the above new dry method white cement raw material preparation device, further, the grinding disc of the roller mill B of the calcareous raw material grinding system adopts a horizontal grinding disc.
In the above new dry method white cement raw meal preparation device, further, the hot air for drying by the roller mill a and the roller mill B is supplied by kiln tail exhaust gas of the firing system and/or by a hot blast stove. The rotating speeds of the circulating fan A, the circulating fan B, the system fan A and the system fan B can be adjusted in a variable frequency mode, and the main motor of the fan can be freely adjusted in a range of 0-50 Hz.
In the above-mentioned novel dry method white cement raw material preparation device, further, the roller housings of the roller mill a and the roller mill B are made of ceramic wear-resistant materials, and the wear-resistant materials used for the inner housings of the built-in high-efficiency powder concentrator of the roller mill a and the built-in high-efficiency powder concentrator of the roller mill B are made of ceramic materials.
Not only improves the wear-resisting life of the roller sleeve, but also reduces Fe in clinker to the maximum extent2O3And (4) content.
In the novel dry method white cement raw material preparation device, further, an aeration system is arranged at the bottom of the siliceous raw material fine powder storage bin of the alumino-silica raw material.
The aeration system can flow and homogenize the materials in the bin.
A novel dry method white cement raw meal preparation process, which uses any one of the novel dry method white cement raw meal preparation devices, comprises the following steps:
the method comprises the following steps: the quartz sandstone and pyrophyllite silicon-aluminum raw materials are respectively metered by a metering scale and a metering scale according to a ratio and then sent into a roller mill A, the materials are efficiently ground and dried and then sent to a built-in efficient powder concentrator of the roller mill A by air for sorting, and sorted finished products are collected by a cyclone cylinder A and then sent to a siliceous raw material fine powder storage bin for storage through a conveying chute A;
step two: after dust of the dust-containing gas out of the cyclone cylinder A is collected by a dust collector A, the dust is discharged into the atmosphere by a system fan A; after drying and grinding, the silicon-aluminum raw material with qualified fineness is fed into a shell of a powder concentrator of a roller mill B of a calcareous raw material grinding system after being metered by a bin bottom metering scale E;
step three: limestone and other raw materials with good grindability are respectively proportioned by a weigher C and a weigher D and then sent into a roller mill B, the materials are efficiently ground and dried and then sent to a built-in efficient powder concentrator of the roller mill B by air for sorting, the sorted qualified fineness materials are mixed with a silicon-aluminum raw material fed by a shell of the powder concentrator, and the uniformly mixed materials are collected by a cyclone cylinder B and then sent into a raw material homogenizing warehouse by a conveying chute B to obtain raw materials with high quality for producing white cement clinker; and the dust-containing gas out of the cyclone cylinder B is discharged into the atmosphere by a system fan B after being collected by a dust collector B.
In the novel dry method white cement raw material preparation process, the silica-alumina raw material with poor grindability is subjected to an independent grinding process, the fineness of the product is controlled to 5-6% of the screen residue of a 45-micron sieve, the calcium raw material with good grindability is subjected to an independent grinding process, and is mixed with the silica-alumina raw material with qualified fineness at the outlet of the powder separator, and the fineness of the product is controlled to 5-6% of the screen residue of the 90-micron sieve.
And the adverse effect of the coarse silicon-aluminum particles in the raw materials on the production of a sintering system is avoided.
In conclusion, the invention has the following advantages and positive effects:
1. the invention respectively dries and grinds the calcium raw materials (limestone and the like) with good grindability and the silicon-aluminum raw materials (quartz sandstone, pyrophyllite and the like) with poor grindability by adopting two sets of grinding systems and equipment instead of mixed grinding, is beneficial to reducing the content of the raw materials with poor grindability such as silicon and aluminum in finished product coarse particles, avoids the over-grinding phenomenon of the raw materials with good grindability such as calcium and the like, and reduces the power consumption of the grinding systems. The raw materials with the two proper finenesses can be mixed to prepare the high-quality raw material.
2. According to the invention, the silicon-aluminum raw material with qualified fineness is fed into the shell of the powder concentrator of the calcium raw material grinding system to be mixed with the calcium material, so that a traditional mixing device is omitted, and the system process is simplified. Meanwhile, the silicon-aluminum raw material with qualified fineness is fed into a shell of a powder selecting machine of the calcium raw material grinding equipment instead of a grinding disc of the grinding equipment, so that the over-grinding phenomenon of the silicon-aluminum raw material is avoided, and the problems of vibration increase of the grinding equipment and the like caused by feeding of a powdery material into the grinding disc are avoided.
3. According to the invention, an included angle of 8-10 degrees is formed between a grinding area of a grinding disc of grinding equipment with poor grindability, such as a silicon-aluminum raw material, and the like, and the horizontal direction, and a horizontal grinding disc is still adopted in a central grinding area, so that the retention time of materials in the grinding mill is prolonged, the adaptability and grinding efficiency to different materials are improved, and the system circulation load is reduced.
4. The process system can respectively dry and grind the calcium raw materials (limestone and the like) with good grindability and the silicon-aluminum raw materials (quartz sandstone, pyrophyllite and the like) with poor grindability by adopting two sets of grinding systems and equipment. The dried and ground siliceous raw material is directly fed into a shell of a powder selecting machine of a calcareous raw material grinding system to be mixed with calcareous materials, and then a qualified product is obtained.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a process flow diagram of the preparation of a novel dry method white cement raw meal provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grinding disc structure of a roller mill for grinding a siliceous material according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of a roller mill B of the present invention.
In the figure:
1. a siliceous raw material storage bin; 2. an aluminum raw material storage bin; 3. a metering scale A; 4. a weigher B; 5. roller grinding A; 6. a hoist A; 7. a cyclone A; 8. a circulating fan A; 9. a dust collector A; 10. a system fan A; 11. a delivery chute A;
12; a calcareous raw material storage bin; 13. other raw material storage bins with good grindability; 14. a weigher C; 15. a scale D; 16. b, roller milling; 17. a hoist B; 18. a cyclone B; 19. a circulating fan B; 20. a dust collector B; 21. a system fan B; 22. a delivery chute B; 23. a siliceous raw material fine powder storage bin; 24. and (4) a metering scale E.
25. An inner shell of the powder concentrator; 26. grinding the roller; 27. a grinding disc; 28. a silicon fine powder feeding port with qualified fineness; 29. the calcareous material is fed into the mouth.
Detailed Description
First, it should be noted that the detailed structure, characteristics, advantages, etc. of the novel dry method white cement raw meal preparation apparatus and process of the present invention will be specifically described below by way of examples, however, all the descriptions are for illustrative purposes only and should not be construed as forming any limitation to the present invention. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. In contrast, when an element is said to be "directly connected" to another element, it is intended that no intervening element is present.
Fig. 1 shows a process flow diagram of a preparation process of a novel dry-method white cement raw meal provided by an embodiment of the invention, and a schematic structural diagram of a grinding disc of a roller mill for grinding siliceous raw meal provided by an embodiment of the invention is shown by fig. 2, and the invention is specifically described by referring to fig. 1 to 2.
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the first embodiment is as follows:
the utility model provides a novel dry process white cement raw material preparation facilities, novel dry process white cement raw material preparation facilities includes silicon aluminium matter raw materials grinding system and calcareous material grinding system, silicon aluminium matter raw materials grinding system carries out the grinding to easy poor silicon aluminium matter raw materials of grindability, calcareous material grinding system carries out grinding and selects separately easy good calcareous raw materials of grindability to with qualified fineness silicon aluminium matter raw materials after silicon aluminium matter raw materials grinding system grinds mixes.
The method is characterized in that the easily ground calcium raw materials (limestone and the like) and the easily ground silica-alumina raw materials (quartz sandstone, pyrophyllite and the like) are respectively dried and ground by two sets of grinding systems and equipment instead of mixed grinding, so that the content of the easily ground silica-alumina raw materials and the like in the finished coarse particles is reduced, the over-grinding phenomenon of the easily ground calcium raw materials and the like is avoided, and the power consumption of the grinding systems is reduced. The raw materials with the two proper finenesses can be mixed to prepare the high-quality raw material.
Still further, it is also contemplated in the present invention that the qualified fineness alumino-silica feedstock is fed to the pulverizer housing of the feed calcareous feedstock pulverizing system. As shown in FIG. 3, the roller mill B16 is provided with a siliceous fine powder feed port 28 of an acceptable fineness and a calcareous raw material feed port 29, and the calcareous raw material is fed to the grinding table 27 through an inner chute.
The silicon-aluminum raw material with qualified fineness is fed into a shell of a powder concentrator of a calcium raw material grinding system to be mixed with calcium materials, and the silicon-aluminum raw material is fully mixed with the calcium and other materials with good grindability under the action of airflow rotating at a high speed at an outlet of the powder concentrator, so that a material mixing device is omitted, and the system process is simplified. Meanwhile, the silicon-aluminum raw material with qualified fineness is fed into the shell of the powder selecting machine of the calcium raw material grinding equipment instead of the grinding disc 27 of the grinding equipment, so that the over-grinding phenomenon of the silicon-aluminum raw material is avoided, and the problems of vibration increase of the grinding equipment and the like caused by feeding the powder material into the grinding disc 27 are avoided.
Furthermore, the invention can also consider that the central grinding area of the grinding disc 27 of the roller mill a5 of the silicon-aluminum raw material grinding system has an angle of 8-10 degrees with the horizontal direction, and the edge grinding area still adopts the horizontal grinding disc 27. As shown in fig. 2, the grinding roller 26 grinds the material on the grinding disc 27, and the grinding disc 27 is positioned below the inner casing 25 of the powder concentrator.
If the silico-aluminous raw material and the calcareous raw material are mixed and ground to the required fineness, the product fineness of the silico-aluminous raw material reaches or even exceeds the fineness of the ordinary portland cement. The center grinding area of the grinding disc 27 of grinding equipment such as a silicon-aluminum raw material and the like with poor grindability has an included angle of 8-10 degrees with the horizontal direction, and the edge grinding area still adopts the horizontal grinding disc 27, so that the retention time of materials in the grinding mill is prolonged, the adaptability and grinding efficiency to different materials are improved, and the system circulation load is reduced.
Example two:
the silicon-aluminum raw material grinding system comprises: a siliceous raw material storage bin 1, a weigher A3 arranged below the siliceous raw material storage bin, an aluminum raw material storage bin 2, a weigher B4 arranged below the aluminous raw material storage bin, a roller mill A5, a lifting machine A6, a cyclone A7, a circulating fan A8, a dust collector A9, a system fan A10, a finished product conveying chute A11, a calcareous raw material fine powder storage bin, a weigher E24 and a lifting machine A6;
discharge ports of a metering scale A3 and a metering scale B4 are communicated with a feed port of a roller mill A5, a discharge port of the roller mill A5 is connected with a cyclone A7, an air outlet of the cyclone A7 is connected with a dust collector A9 through a circulating fan A8, an air outlet of the dust collector A9 is exhausted through a system fan A10, a finished product conveying chute A11 is arranged below a discharge port at the bottom of the dust collector A9 and a discharge port at the bottom of the cyclone A7, the tail end of the finished product conveying chute A11 is connected with a fine powder storage bin of the fine powder of the raw material, a metering scale E24 is arranged below the fine powder storage bin of the raw material, one end of a hoister A6 is connected with a slag discharge port of the roller mill A5, and the other end of the;
the calcareous raw material grinding system comprises: a calcareous raw material storage bin 12, a weigher C14 arranged below the calcareous raw material storage bin, other raw material storage bins 13 with good grindability, a weigher D15 arranged below the weigher, a roller mill B16, a lifting machine B17, a cyclone cylinder B18, a circulating fan B19, a dust collector B20, a system fan B21, a finished product conveying chute B22 and a lifting machine B17;
the discharge ports of the metering scale C14, the metering scale D15 and the metering scale E24 are communicated with the feed port of a roller mill B16, the discharge port of the roller mill B16 is connected with a cyclone B18, the other end of the roller mill B16 is connected with a feeding belt, the air outlet of the cyclone B18 is connected with a dust collector B20 through a circulating fan B19, the air outlet of the dust collector B20 is exhausted through a system fan B21, a finished product conveying chute B22 is arranged below the bottom discharge port of the dust collector B20 and the bottom discharge port of the cyclone B18, the tail end of the finished product conveying chute B22 is communicated with a raw material warehouse, and one end of the elevator B17 is connected with a slag discharge port of the roller mill B16.
The grinding equipment adopts a roller mill, so that the grinding efficiency is high, the drying capacity is strong, and the power consumption of a grinding system is reduced.
It should be noted that the grinding disc 27 of the roller mill B16 of the calcareous raw material grinding system employs a horizontal grinding disc 27.
It should be noted that the hot air used for drying by the roller mill a5 and roller mill B16 is supplied by kiln tail exhaust gas of the firing system and/or by a hot blast stove. The rotating speeds of the circulating fan A8, the circulating fan B19, the system fan A10 and the system fan B21 can be adjusted in a variable frequency mode, and the main motor of the fan can be freely adjusted in a range of 0-50 Hz.
It should be noted that, the roller mill a5 and the roller mill B16 both use ceramic wear-resistant materials, and the wear-resistant materials used in the inner housings of the roller mill a5 built-in high-efficiency powder concentrator and the roller mill B16 built-in high-efficiency powder concentrator are ceramic materials.
Not only improves the wear-resisting life of the roller sleeve, but also reduces Fe in clinker to the maximum extent2O3And (4) content.
It should be noted that an aeration system is arranged at the bottom of the siliceous raw material fine powder storage bin 23 of the alumino-silica raw material.
The aeration system is in the prior art and can flow and homogenize the materials in the bin.
Example three:
a novel dry method white cement raw meal preparation process, which uses any one of the novel dry method white cement raw meal preparation devices, comprises the following steps:
the method comprises the following steps: the quartz sandstone and pyrophyllite silicon-aluminum raw materials are respectively metered by a metering scale and a metering scale according to a ratio and then sent into a roller mill A5, the materials are efficiently ground and dried and then sent to a built-in efficient powder concentrator of the roller mill A5 by wind for sorting, and sorted finished products are collected by a cyclone cylinder A7 and then sent to a siliceous raw material fine powder storage bin 23 through a conveying chute A11 for storage;
step two: dust-containing gas out of the cyclone cylinder A7 is discharged into the atmosphere by a system fan A10 after being collected by a dust collector A9; after drying and grinding, the silicon-aluminum raw material with qualified fineness is fed into a shell of a powder concentrator of a roller mill B16 of a calcareous raw material grinding system after being metered by a bin bottom metering scale E24;
step three: limestone and other raw materials with good grindability are respectively weighed by a weighing scale C14 and a weighing scale D15 according to the proportion, then are sent into a roller mill B16, the materials are efficiently ground and dried, then are sent to a built-in efficient powder concentrator of the roller mill B16 by air for sorting, the sorted qualified fineness materials are mixed with a silicon-aluminum raw material fed by a shell of the powder concentrator, the uniformly mixed materials are collected by a cyclone cylinder B18, and then are sent into a raw material homogenizing warehouse by a conveying chute B22 to obtain raw materials with excellent quality for producing white cement clinker; the dust-containing gas out of the cyclone cylinder B18 is collected by a dust collector B20 and then is discharged into the atmosphere by a system fan B21.
Furthermore, the invention can also consider that the silica-alumina raw material with poor grindability adopts an independent grinding process, the fineness of the product is controlled to 5-6% of the sieve residue of a 45 mu m sieve, the calcium raw material with good grindability adopts an independent grinding process, and is mixed with the silica-alumina raw material with qualified fineness at the outlet of the powder concentrator, and the fineness of the product is controlled to 5-6% of the sieve residue of a 90 mu m sieve.
And the adverse effect of the coarse silicon-aluminum particles in the raw materials on the production of a sintering system is avoided.
In conclusion, the invention can provide a novel dry method white cement raw material preparation device and process which can improve the quality of raw material finished products, have stable raw material components, low system energy consumption and low heat consumption.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. The utility model provides a novel dry process white cement raw material preparation device which characterized in that: the novel dry method white cement raw material preparation device comprises a silicon-aluminum raw material grinding system and a calcium raw material grinding system, wherein the silicon-aluminum raw material grinding system is used for grinding a silicon-aluminum raw material with poor grindability, and the calcium raw material grinding system is used for grinding and sorting a calcium raw material with good grindability and mixing the calcium raw material with a qualified fineness of the silicon-aluminum raw material ground by the silicon-aluminum raw material grinding system.
2. The new dry method white cement raw meal preparation device according to claim 1, characterized in that: and feeding the qualified fineness of the silicon-aluminum raw material into a shell of a powder concentrator of the calcareous raw material grinding system.
3. The new dry method white cement raw meal preparation device according to claim 1, characterized in that: the center grinding area of a grinding disc of a roller type grinder A of the silicon-aluminum raw material grinding system has an included angle of 8-10 degrees with the horizontal direction, and a horizontal grinding disc is still adopted in an edge grinding area.
4. The new dry method white cement raw meal preparation device according to claim 1, characterized in that: the silicon-aluminum raw material grinding system comprises: a siliceous raw material storage bin, a weigher A arranged below the siliceous raw material storage bin, an aluminum raw material storage bin, a weigher B arranged below the aluminous raw material storage bin, a roller mill A, a lifting machine A, a cyclone cylinder A, a circulating fan A, a dust collector A, a system fan A, a finished product conveying chute A, a calcareous raw material fine powder storage bin, a weigher E and a lifting machine A;
the discharge ports of the metering scale A and the metering scale B are communicated with the feed port of the roller mill A, the discharge port of the roller mill A is connected with a cyclone cylinder A, the air outlet of the cyclone cylinder A is connected with a dust collector A through a circulating fan A, the air outlet of the dust collector A exhausts air through a system fan A, a finished product conveying chute A is arranged below the discharge port at the bottom of the dust collector A and the discharge port at the bottom of the cyclone cylinder A, the tail end of the finished product conveying chute A is connected with the fine powder storage bin of the raw materials, a metering scale E is arranged below the fine powder storage bin of the raw materials, one end of a lifter A is connected with the slag discharge port of the roller mill A, and the other end of;
the calcareous raw material grinding system comprises: a limestone raw material storage bin, a metering scale C arranged below the limestone raw material storage bin, other raw material storage bins, a metering scale D arranged below the limestone raw material storage bin, a roller mill B, a lifting machine B, a cyclone cylinder B, a circulating fan B, a dust collector B, a system fan B, a finished product conveying chute B and a lifting machine B;
the discharge ports of the metering scale C, the metering scale D and the metering scale E are communicated with a feed port of the roller mill B, the discharge port of the roller mill B is connected with the cyclone cylinder B, the other end of the roller mill B is connected with a feed belt of the roller mill B, an air outlet of the cyclone cylinder B is connected with the dust collector B through the circulating fan B, an air outlet of the dust collector B exhausts air through the system fan B, a finished product conveying chute B is arranged below a bottom discharge port of the dust collector B and a bottom discharge port of the cyclone cylinder B, the tail end of the finished product conveying chute B is communicated with a raw material warehouse, and one end of the elevator B is connected with a slag discharge port of the.
5. The new dry method white cement raw meal preparation device according to claim 2, characterized in that: the grinding disc of the roller mill B of the calcareous raw material grinding system adopts a horizontal grinding disc.
6. The new dry method white cement raw meal preparation device according to claim 2, characterized in that: the hot air for drying the roller mill A and the roller mill B is supplied by kiln tail waste gas of a firing system and/or a hot blast stove. The rotating speeds of the circulating fan A, the circulating fan B, the system fan A and the system fan B can be adjusted in a variable frequency mode, and the main motor of the fan can be freely adjusted in a range of 0-50 Hz.
7. The new dry method white cement raw meal preparation device according to claim 2, characterized in that: the roller mill A and the roller mill B are made of ceramic wear-resistant materials, and the built-in high-efficiency powder concentrator of the roller mill A and the built-in high-efficiency powder concentrator of the roller mill B are made of ceramic materials.
8. The new dry method white cement raw meal preparation device according to claim 2, characterized in that: and an inflation system is arranged at the bottom of the siliceous raw material fine powder storage bin of the alumino-silica raw material.
9. A novel dry method white cement raw material preparation technology is characterized in that: the novel dry method white cement raw meal preparation process uses the novel dry method white cement raw meal preparation device of any one of claims 1 to 8, and comprises the following steps:
the method comprises the following steps: the quartz sandstone and pyrophyllite silicon-aluminum raw materials are respectively metered by a metering scale and a metering scale according to a ratio and then sent into a roller mill A, the materials are efficiently ground and dried and then sent to a built-in efficient powder concentrator of the roller mill A by air for sorting, and sorted finished products are collected by a cyclone cylinder A and then sent to a siliceous raw material fine powder storage bin for storage through a conveying chute A;
step two: after dust of the dust-containing gas out of the cyclone cylinder A is collected by a dust collector A, the dust is discharged into the atmosphere by a system fan A; after drying and grinding, the silicon-aluminum raw material with qualified fineness is fed into a shell of a powder concentrator of a roller mill B of a calcareous raw material grinding system after being metered by a bin bottom metering scale E;
step three: limestone and other raw materials with good grindability are respectively proportioned by a weigher C and a weigher D and then sent into a roller mill B, the materials are efficiently ground and dried and then sent to a built-in efficient powder concentrator of the roller mill B by air for sorting, the sorted qualified fineness materials are mixed with a silicon-aluminum raw material fed by a shell of the powder concentrator, and the uniformly mixed materials are collected by a cyclone cylinder B and then sent into a raw material homogenizing warehouse by a conveying chute B to obtain raw materials with high quality for producing white cement clinker; and the dust-containing gas out of the cyclone cylinder B is discharged into the atmosphere by a system fan B after being collected by a dust collector B.
10. The novel dry process raw white cement manufacturing process according to claim 9, characterized in that: the method is characterized in that the silica-alumina raw material with poor grindability is subjected to an independent grinding process, the fineness of a product is controlled to 5-6% of the screen residue of a 45-micron sieve, the calcareous raw material with good grindability is subjected to an independent grinding process, and is mixed with the silica-alumina raw material with qualified fineness at the outlet of a powder concentrator, and the fineness of the product is controlled to 5-6% of the screen residue of a 90-micron sieve.
CN202010654787.9A 2020-07-09 2020-07-09 Novel dry method white cement raw material preparation device and process Pending CN111729728A (en)

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