CN115475567A - Production system and process of thin-sheet talcum powder - Google Patents
Production system and process of thin-sheet talcum powder Download PDFInfo
- Publication number
- CN115475567A CN115475567A CN202211113308.8A CN202211113308A CN115475567A CN 115475567 A CN115475567 A CN 115475567A CN 202211113308 A CN202211113308 A CN 202211113308A CN 115475567 A CN115475567 A CN 115475567A
- Authority
- CN
- China
- Prior art keywords
- grinding
- separator
- talc
- flake
- chamber
- 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.)
- Pending
Links
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title abstract description 13
- 230000008569 process Effects 0.000 title abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 83
- 238000003756 stirring Methods 0.000 claims abstract description 71
- 239000002245 particle Substances 0.000 claims abstract description 36
- 238000001238 wet grinding Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims description 52
- 239000000454 talc Substances 0.000 claims description 48
- 229910052623 talc Inorganic materials 0.000 claims description 48
- 235000012222 talc Nutrition 0.000 claims description 48
- 239000007788 liquid Substances 0.000 claims description 20
- 239000002270 dispersing agent Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 12
- 239000002562 thickening agent Substances 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 239000004033 plastic Substances 0.000 abstract description 13
- 229920003023 plastic Polymers 0.000 abstract description 13
- 239000000919 ceramic Substances 0.000 abstract description 12
- 238000010304 firing Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 238000003860 storage Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 10
- 239000000725 suspension Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- -1 feeding bin Chemical compound 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000001613 Gambling Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
-
- 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
- C01F7/78—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
- C01F7/784—Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
- C01F7/785—Hydrotalcite
Abstract
The utility model provides a production system and technology of thin slice type talcum powder, includes feeding storehouse, wet grinding machine, holding vessel, and the wet grinding machine is including grinding chamber, puddler, no sieve separator, and the feed inlet of grinding machine is followed the bottom of grinding the chamber gets into, and no sieve separator is at the top of grinding the chamber, and no sieve separator's upper end sets up the discharge gate, and the puddler is in grinding the chamber, and L shape stirring rake is installed to the top of puddler, and a plurality of disc type stirring leaf is installed to the below of L shape stirring rake, is provided with the separator rotor in the no sieve separator, grinds chamber upper portion lateral wall and is equipped with the grinding medium discharge gate. The talcum powder produced by the invention is a flake talcum powder with high flake index, has uniform particle size distribution, higher purity and lower impurity content, and the final finished product is irregular-shaped particles aggregated by the talcum powder and is easy to disperse. The physical property of the modified plastic can be greatly improved, the thermal expansion coefficient of the honeycomb ceramic in the firing process can be reduced, and the yield is improved.
Description
Technical Field
The invention relates to the technical field of talcum powder manufacturing, in particular to a production system and a production process of sheet talcum powder, wherein the produced talcum powder is mainly applied to plastic modification and honeycomb ceramic sintering.
Background
The talc is a mineral substance with a flaky structure, the traditional airflow grinding process is adopted, only the talc particles are made finer, the flaky structure of each talc particle cannot be reserved, for plastic modification enterprises, the fine talc powder cannot meet the requirements of plastic parts, particularly automobile bumpers and the like on high elasticity and toughness, and for the honeycomb ceramic industry, the common talc powder cannot meet the requirements of porous DPF carriers.
Adopt wet grinding can be better keep the lamellar structure of talcum, but wet grinding technology still has many drawbacks to talcum, because talcum is oleophylic hydrophobic mineral substance, ordinary wet grinding equipment need separate grinding medium and product through the screen cloth, talcum thick liquids are difficult to pass through the screen cloth because viscosity is great, in addition, the lamellar structure granule of talcum also blocks up the screen cloth very easily, causes the frequent change of screen cloth. In addition, in the common wet grinding equipment, the slurry needs to be diluted before entering the separator, and then can be separated, so that the process is complex.
Talc is insoluble in water and, by using a common wet grinding process, a large amount of talc adheres to the grinding media, resulting in lower grinding efficiency. In addition, the talc slurry has high viscosity and high flow resistance, so that the production efficiency is low. Conventional wet milling equipment and processes are therefore not suitable for milling talc.
If the ground talc is subjected to a common conveyor belt type drying process, the talc powder can form hard blocky particles which cannot be dispersed in subsequent use, so that the talc is not uniformly mixed with other materials, the mechanical property of a plastic product is influenced, and the firing yield of a honeycomb ceramic product is also influenced.
Disclosure of Invention
The invention aims to provide a production system and a production process of sheet talcum powder, the produced talcum powder is the sheet talcum powder with high sheet index, the particle size distribution is uniform, the purity is higher, the impurity content is lower, and the final finished product is irregular-shaped particles formed by aggregation of the talcum powder and is easy to disperse. The physical property of the modified plastic can be greatly improved, the thermal expansion coefficient of the honeycomb ceramic in the firing process can be reduced, and the yield is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a production system of thin slice type talcum powder, includes feeding bin, wet grinding machine, holding vessel, the wet grinding machine is including grinding chamber, puddler, no sieve separator, and the feed inlet of grinding the machine is followed the bottom in grinding the chamber gets into, no sieve separator is at the top of grinding the chamber, the upper end of no sieve separator sets up the discharge gate, the puddler is in grinding the chamber, L shape stirring rake is installed to the top of puddler, and a plurality of disc type stirring leaf is installed to the below of L shape stirring rake, be provided with the separator rotor in the no sieve separator, it is equipped with the grinding medium discharge gate to grind chamber upper portion lateral wall.
The separator rotor comprises a rotor stirring rod and separator rotor blades, the separator rotor blades are plate-shaped and narrow at the top and wide at the bottom, and the separator rotor blades are uniformly distributed and fixed on the rotor stirring rod along the circumferential direction.
The width of the top of the separator rotor blade is 25-35 mm, the width of the bottom of the separator rotor blade is 280-320 mm, the height of the separator rotor blade is 280-320 mm, the thickness of the separator rotor blade is 3-5 mm, and the included angle of the separator rotor blade is 15-45 degrees.
The feed inlet is arranged at the axis position of the bottom of the grinding cavity, and a pipe body at the inlet is vertical to the bottom surface of the grinding cavity; the discharge hole and the central axis of the grinding cavity form an angle of 30-60 degrees.
The L-shaped stirring paddles are symmetrically arranged in pairs, and blades of the stirring paddles are parallel to the axis of the grinding cavity.
The L-shaped stirring paddles are in a pair, the height of the stirring paddle blade is 30-40 mm, the thickness of the stirring paddle blade is 3-5 mm, the width of the stirring paddle blade is 45-55 mm, and the length of a cross beam at the bottom of the stirring paddle is 280-320 mm.
The distance between the disc type stirring blades is 250-350 mm.
A production process of a production system utilizing thin sheet type talcum powder comprises the following steps:
1) The particle diameter of the talc powder raw material is D50, 20-30 μm; d98 70-100 μm;
2) Mixing talc, water, a dispersant and a defoaming agent to prepare slurry liquid; wherein, the content of the dispersant in the slurry liquid is 0.3wt% -0.4 wt%, the content of the defoamer in the slurry liquid is 0.8wt% -1.0 wt%, the content of the water in the slurry liquid is 58.6wt% -68.9 wt%, and the balance is talc powder raw material;
3) And (3) a wet grinding part: the conveying amount of the slurry is 4-5 m 3 H; the linear speed of the disc type stirring blade in the grinding cavity is 8-12 m/s; the rotating speed of a rotor blade of a separator in the screenless separator is 4000-5000 r/min;
4) The wet grinding discharge enters a thickener, and the solid content of the slurry which is discharged from the thickener and enters a freeze dryer is 65-70 wt%.
The dispersant is a high molecular anionic copolymer; the defoaming agent is a water-based mineral oil defoaming agent; the grinding medium is zirconia beads, the diameter of the grinding medium is 0.6-0.8 mm, and the filling amount is 85%.
The flaky talcum powder produced by utilizing a flaky talcum powder production system has the flaky index of talcum powder particles being more than or equal to 4.5, the particle size (MS 2000 test) D50 being 12-16 mu m, and the particle size D98 being 50-65 mu m; the loss on ignition of the flake talcum powder is less than or equal to 6 percent, and the CaO content is less than or equal to 0.5 percent.
Compared with the prior art, the invention has the beneficial effects that:
1) In order to solve the problem of talc particle gambling net, the invention designs a separator without a screen mesh, and the product and the grinding medium are separated by adopting a centrifugal separation mode. The separator rotor blades are designed to be narrow at the top and wide at the bottom and are regularly arranged at a certain angle, talc slurry liquid meeting requirements can be collected at the top of the separator by adjusting the rotating speed of the blades, grinding media can be collected at the periphery of the bottom of the blades, and then the grinding media are returned to the grinding cavity. The separator designed by the invention is combined with a proper amount of dispersing agent, and the ground slurry liquid can be directly sent into the separator without being diluted to separate the materials from the grinding medium.
2) In order to match the operation of the screenless separator, a pair of L-shaped stirring paddles is arranged at the top end of the stirring rod of the grinding machine close to the separator, and the L-shaped stirring paddles play a role of upward drainage so that the ground slurry liquid flows into the separator conveniently.
3) The feed inlet is designed on the bottom surface of the cylinder body, and the pipe body at the feed inlet is vertical to the bottom surface of the grinding cavity. In this way, the slurry can directly impact the grinding medium upwards from the bottom of the grinding cavity, the grinding force is increased, and the accumulation of the slurry and the grinding medium caused by the fact that the bottom of the grinding cavity cannot be stirred is reduced.
4) The discharge port at the top of the separator is designed according to an oblique upward angle of 30-60 degrees, so that the talc slurry liquid meeting the requirement can be effectively collected.
5) According to the invention, the dispersing agent and the defoaming agent are added into the talc slurry liquid in a proper proportion, so that talc adhesion grinding media can be reduced, the viscosity of the talc slurry liquid is reduced, and the talc slurry liquid is smoother in the wet grinding process.
6) The invention designs a freeze drying mode, the dried talc material is irregular loose small particles, and the small particles can be dispersed by simply applying pressure and can be directly used.
Drawings
Fig. 1 is a schematic view of a wet grinding machine according to the present invention.
Fig. 2 is a schematic view of a separator rotor in a wet mill.
Fig. 3 is a top view of the separator rotor.
FIG. 4 is a flow chart of a production process of flake-type talc powder granules.
FIG. 5 is a front view of an L-shaped paddle.
FIG. 6 is a top view of an L-shaped paddle.
In the figure: 1-a feed inlet; 2-grinding chamber; 3-a stirring rod; 4-grinding media; 5-no screen separator; 6-discharging port; 7-L-shaped stirring paddle; 8-a separator rotor; 9-disc type stirring blade; 10-separator rotor blades; 11-rotor stirring rod, 12-slurry pump, 13-pinion, 14-inner gear ring, 15-transmission gear and 16-grinding medium discharge port.
Detailed Description
The present invention will be described in detail below, but the scope of the present invention is not limited to the following embodiments.
See fig. 1, a production system of thin slice type talcum powder, including feeding bin, wet process grinding machine, holding vessel, the wet process grinding machine is including grinding chamber 2, puddler 3, no sieve separator 5, and the feed inlet 1 of grinding machine is followed the bottom of grinding chamber 2 gets into, no sieve separator 5 is at the top of grinding chamber 2, the upper end of no sieve separator 5 sets up discharge gate 6, puddler 3 is in grinding chamber 2, a plurality of disc type stirring leaf 9 is installed to the below that L shape stirring rake 7,L shape stirring rake 7 is installed to the top of puddler 3, be provided with separator rotor 8 in the no sieve separator 5, the upper portion lateral wall of grinding chamber 2 is equipped with grinding medium discharge gate 16.
Referring to fig. 2 and 3, the separator rotor 8 includes a rotor stirring rod 11 and separator rotor blades 10, the separator rotor blades 10 are plate-shaped with a narrow top and a wide bottom, and the separator rotor blades 10 are uniformly fixed on the rotor stirring rod 11 along the circumferential direction. The diameter of the bottom of the separator rotor blade 10 is larger than the diameter of the grinding chamber, so that the grinding media 4 can be blocked at the bottom of the separator rotor 10 at high speed rotation of the separator rotor blade 10.
The stirring rod 3 is connected with the rotor stirring rod 11 through a gear reduction mechanism, the gear reduction mechanism is composed of a pinion 13, a transmission gear 15, an inner gear ring 14 and a shell, the shell is fixedly connected with the inner wall of the grinding cavity 2 through a support rod, the inner gear ring 14 is fixed on the inner wall of the shell, the pinion 13 is fixedly connected with the rotor stirring rod 5, the transmission gear 15 is simultaneously meshed with the pinion 13 and the inner gear ring 14, a center connecting rod of the transmission gear 15 is connected with the stirring rod 3 (a bearing is arranged between the transmission gear 15 and the center connecting rod), the rotor stirring rod 11 is driven to rotate through a motor to realize rapid rotation, the transmission gear 15 revolves around the pinion 13 under the transmission of the pinion 13 and drives the rotor stirring rod 11 to rotate, and after the speed is reduced through the gear reduction mechanism, the different rotating speeds of the stirring rod 3 and the rotor stirring rod 11 are realized. The rotating speed of the disc type stirring blade is 8-12 m/s, grinding between the grinding medium 4 and the talc powder is realized, slurry continuously flows upwards, the rotating speed of the rotor stirring rod 11 is 4000-5000 r/m, the bottom of the rotor blade 10 of the separator rotating at high speed forms a dense dynamic screen at the moment, the grinding medium 4 with large grain diameter is blocked below the rotor blade 10 of the separator, and the talc powder with small grain diameter flows into the non-sieve separator 5 and is sent out through the discharge hole 6. Grinding medium 4 is returned to the feed bin for recycling from grinding medium outlet 16. The housing is connected with the stirring rod 3 and the rotor stirring rod 11 through bearings and is provided with a seal.
The width of the top of the separator rotor blade 10 is 25-30 mm, the width of the bottom of the separator rotor blade 10 is 280-320 mm, the height of the separator rotor blade 10 is 280-320 mm, the thickness of the separator rotor blade 10 is 3-5 mm, and the included angle of the separator rotor blade is 15-45 degrees.
The feed inlet 1 is arranged at the axis position of the bottom of the grinding cavity 2, and a pipe body at the inlet is vertical to the bottom surface of the grinding cavity 2; the discharge port 6 and the central axis of the grinding cavity form an angle of 30-60 degrees.
The L-shaped stirring paddles 7 are symmetrically arranged in pairs, and blades of the stirring paddles are parallel to the axis of the grinding cavity.
The L-shaped stirring paddles 7 are in a pair, the height h of the blades of the stirring paddles is 30-40 mm, the thickness b is 3-5 mm, the width c is 45-55 mm, and the length a of the cross beam at the bottom of the stirring paddles is 280-320 mm.
The distance between the disc type stirring blades 9 is 250-350 mm.
The production system further comprises a Raymond mill, a powder storage bin, a dispersant preparation tank, a defoaming preparation tank, a mixing bin, a concentrator and a freeze dryer, wherein the Raymond mill feeds materials to the powder storage bin, the dispersant preparation tank and the defoaming preparation tank respectively feed materials to the mixing bin, the mixing bin feeds materials to the feeding bin, the feeding bin feeds materials to a wet grinding machine, the wet grinding machine feeds materials to a storage tank, the storage tank feeds materials to the concentrator, concentrated water of the concentrator returns to the mixing bin, and powder materials of the concentrator are fed into the freeze dryer.
A production process of a production system utilizing thin sheet type talcum powder comprises the following steps:
1) The particle diameter of the talc powder raw material is D50, 20-30 μm; d98 70-100 μm.
The grinding state of the talcum powder before wet grinding has great influence on the retention of the subsequent wet grinding sheet structure, the particle size of the talcum powder after passing through a Raymond mill is designed to be D50, 20-30 mu m and D98, 70-100 mu m, and the design is more favorable for the retention of the sheet structure of the final product.
2) Mixing talc, water, a dispersant and a defoaming agent to prepare slurry liquid; wherein, the content of the dispersant in the slurry liquid is 0.3wt% -0.4 wt%, the content of the defoamer in the slurry liquid is 0.8wt% -1.0 wt%, the content of the water in the slurry liquid is 58.6wt% -68.9 wt%, and the balance is talc powder raw material.
In order to ensure that the addition of the two additives does not influence the properties of the finished product, the addition proportion is respectively 0.3wt% -0.4 wt% and 0.8wt% -1.0 wt%.
3) And (3) wet grinding part: the conveying amount of the slurry is 4-5 m 3 H; the linear velocity of a disc type stirring blade in the grinding cavity is 8-12 m/s; the rotating speed of the rotor blade of the separator in the screenless separator is 4000-5000 r/min.
4) The discharged material after wet grinding enters a thickener, and the solid content of the slurry which is discharged from the thickener and enters a freeze dryer is 65-70 wt%; the material form from the freeze dryer is irregular particles with the shape of less than 0.3mm, the water content is less than or equal to 0.4 percent, and the material can be dispersed into talcum powder by lightly pressing.
The dispersant is a high molecular anionic copolymer; the defoaming agent is a water-based mineral oil defoaming agent; the grinding medium is zirconia beads, the diameter of the grinding medium is 0.6-0.8 mm, and the filling amount is 85%.
The flaky talcum powder produced by utilizing a flaky talcum powder production system has the flaky index of talcum powder particles being more than or equal to 4.5, the particle size (MS 2000 test) D50 being 12-16 mu m, and the particle size D98 being 50-65 mu m; the loss on ignition of the flake talcum powder is less than or equal to 6 percent, and the CaO content is less than or equal to 0.5 percent.
The sheet talcum powder can greatly improve the elastic modulus and the tensile modulus of modified plastics and the sintering qualification rate of honeycomb ceramics.
Due to the property of the talc, in the wet grinding process, the particle diameter of the grinding medium is designed to be 0.6-0.8 mm, the filling quantity is 85%, the distance between the stirring blades is 250-350 mm, the stirring speed is designed to be 8-12 m/s, the design can ensure that the flaky structure of the talc is better peeled off, and the conveying quantity of the slurry is designed to be 4-5 m 3 The method has the advantages that the operation efficiency of the whole production process can be ensured, and the yield is higher. The rotating speed of the blades of the separator is designed to be 4000-5000 rpm, and the rotating speed can effectively separate the talc slurry from the grinding medium.
The following technical solutions of the present invention will be further described with reference to the accompanying drawings and examples to further understand the advantages and effects of the technical solutions of the present invention, and the examples do not limit the scope of the present invention, which is determined by the claims.
Example 1:
feeding SiO into Raymond mill 2 The talc slag with the content of more than 60 percent is produced into coarse powder with the grain diameters of D50, 23.6 mu m, D98 and 81.5 mu m by the rotation speed of an analyzer of a Raymond mill at 30 revolutions per minute, and then the coarse powder is led into a powder storage bin. Adding water and a dispersing agent into a mixing bin, wherein the proportion of the dispersing agent is 0.3% and the proportion of the defoaming agent is 0.8%, stirring for 5 minutes, slowly putting the talc coarse powder in a powder storage bin into the mixing bin, discharging for 5 minutes, increasing the stirring speed after all the powder is put into the mixing bin, and stirring for 30 minutes to prepare the talc slurry suspension. Introducing the suspension into a feeding bin, and stirring at low speed in the feeding bin to preventAnd (4) depositing the suspension. Starting the wet grinding machine to stir at the stirring speed of 8m/s, starting the slurry delivery pump to feed the suspension in the feeding bin from the bottom of the wet grinding machine, wherein the slurry pump inlet flow is 4.5m 3 H is used as the reference value. The rotor speed of the separator was set to 4200 rpm, the slurry was fed to the separator, the desired slurry was directed to a holding tank, and the separated grinding media was fed to a feed bin and returned to the grinding chamber. Keeping the storage tank in a low-speed stirring state, feeding the slurry in the storage tank into a thickener, concentrating the slurry into slurry with the solid content of 65%, feeding the concentrated slurry into a freeze dryer, drying the slurry into particles with the particle size of about 0.2mm, slightly pressing the particles to disperse the particles, and detecting that the particle size of the dispersed particles is D50 (MS 2000), 15.3 mu m, D98 (MS 2000), 61.5 mu m, the sheet index is 4.9, the loss on ignition (1000 ℃,1 h) is 5.7% and the CaO content is 0.2%. The main test data for the use of the product in plastics (polypropylene) and ceramics are given in table 1, wherein the talc content in plastics (polypropylene) is 17 wt.% and the talc content in ceramics is 30 wt.%.
Table 1 example 1 performance data for plastics and ceramics using the product
Example 2:
feeding SiO into Raymond mill 2 The talc slag with the content of more than 60 percent is produced into coarse powder with the grain diameter of D50, 24.3 mu m, D98 and 87.8 mu m by the rotating speed of an analyzer of a Raymond mill at 30 revolutions per minute, and then the coarse powder is led into a powder storage bin. Adding water and a dispersing agent into a mixing bin, wherein the proportion of the dispersing agent is 0.4% and the proportion of the defoaming agent is 1.0%, stirring for 5 minutes, slowly putting the talc coarse powder in a powder storage bin into the mixing bin, discharging for 5 minutes, increasing the stirring speed after all the powder is put into the mixing bin, and stirring for 30 minutes to prepare the talc slurry suspension. The suspension is introduced into a feeding bin, and the feeding bin is kept stirring at a low speed so as to prevent the suspension from depositing. Starting the wet grinding mill to stir at a stirring speed of 12m/s, starting a slurry delivery pump to feed the suspension in the feeding bin from the bottom of the wet grinding mill, and feeding the slurryThe pumping flow rate is 5.0m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The rotor speed of the separator was set to 4800 rpm, the slurry flowed into the separator, the desired slurry was directed to a storage tank, and the separated grinding media was fed to a feed bin and returned to the grinding chamber. Keeping the storage tank in a low-speed stirring state, feeding the slurry in the storage tank into a thickener, concentrating the slurry into slurry with the solid content of 70%, feeding the concentrated slurry into a freeze dryer, drying the slurry into particles with the particle size of about 0.2mm, slightly pressing the particles to disperse the particles, and detecting that the particle size of the dispersed particles is D50 (MS 2000), 12.7 microns, D98 (MS 2000), 54.1 microns, the flake index is 4.8, the loss on ignition (1000 ℃,1 h) is 5.9 percent and the CaO content is 0.2 percent. The main test data for the use of the product in plastics (polypropylene) and ceramics, wherein the talc content in plastics (polypropylene) is 17 wt.% and in ceramics is 30 wt.%, are given in table 2.
Table 2 example 2 performance data for plastics and ceramics using this product
Claims (10)
1. The utility model provides a production system of thin slice type talcum powder, includes feeding bin, wet grinding machine, holding vessel, a serial communication port, the wet grinding machine is including grinding chamber, puddler, no sieve separator, and the feed inlet of grinding machine is followed the bottom in grinding chamber gets into, no sieve separator is at the top of grinding the chamber, the upper end that no sieve separator set up the discharge gate, the puddler is in grinding the chamber, L shape stirring rake is installed to the top of puddler, and a plurality of disc type stirring leaf is installed to the below of L shape stirring rake, be provided with the separator rotor in the no sieve separator, it is equipped with the grinding medium discharge gate to grind chamber upper portion lateral wall.
2. The system for producing a flake-type talc according to claim 1, wherein said separator rotor comprises a rotor stirring bar and separator rotor blades, said separator rotor blades are in the form of a plate having a narrow top and a wide bottom, and said separator rotor blades are uniformly fixed to said rotor stirring bar in the circumferential direction.
3. The system for producing thin sheets of talc according to claim 2, wherein said separator rotor blade has a top width of 25-35 mm, a bottom width of 280-320 mm, a height of 280-320 mm, a thickness of 3-5 mm, and an included angle of 15-45 degrees.
4. The system for producing a flake-type talc according to claim 1, wherein said feed port is provided at a bottom axial position of the grinding chamber, and a tube body at the inlet is perpendicular to a bottom surface of the grinding chamber; the discharge hole and the central axis of the grinding cavity form an angle of 30-60 degrees.
5. A system for producing flake-type talc according to claim 1, wherein said L-shaped paddles are symmetrically arranged in pairs and have blades parallel to the grinding chamber axis.
6. The system for producing flake-type talc according to claim 5, wherein said L-shaped paddles have a pair of blades with a height of 30-40 mm, a thickness of 3-5 mm, a width of 45-55 mm, and a length of 280-320 mm.
7. A sheet-type talc production system according to claim 1, wherein the pitch of said disk-type stirring blades is 250 to 350mm.
8. A production process using the production system for a flake-type talc according to any one of claims 1 to 7, comprising:
1) The particle diameter of the talc powder raw material is D50, 20-30 μm; d98 70-100 μm;
2) Mixing talc, water, a dispersant and a defoaming agent to prepare slurry liquid; wherein, the content of the dispersant in the slurry liquid is 0.3wt% -0.4 wt%, the content of the defoamer in the slurry liquid is 0.8wt% -1.0 wt%, the content of the water in the slurry liquid is 58.6wt% -68.9 wt%, and the balance is talc powder raw material;
3) And (3) wet grinding part: the conveying amount of the slurry is 4-5 m 3 H; the linear speed of the disc type stirring blade in the grinding cavity is 8-12 m/s; the rotating speed of the rotor blade of the separator in the screenless separator is 4000-5000 r/min;
4) The wet grinding discharge enters a thickener, and the solid content of the slurry which is discharged from the thickener and enters a freeze dryer is 65-70 wt%.
9. The production process of the production system of flake talc according to claim 8, wherein the dispersant is a high molecular anionic copolymer; the defoaming agent is a water-based mineral oil defoaming agent; the grinding medium is zirconia beads, the diameter of the grinding medium is 0.6-0.8 mm, and the filling amount is 85%.
10. A flake-type talc produced by the production system for a flake-type talc according to any one of claims 1 to 7, wherein the flake index of the talc particles is not less than 4.5, the particle diameter D50 is 12 to 16 μm, and D98 is 50 to 65 μm; the loss on ignition of the flake talcum powder is less than or equal to 6 percent, and the CaO content is less than or equal to 0.5 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211113308.8A CN115475567A (en) | 2022-09-14 | 2022-09-14 | Production system and process of thin-sheet talcum powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211113308.8A CN115475567A (en) | 2022-09-14 | 2022-09-14 | Production system and process of thin-sheet talcum powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115475567A true CN115475567A (en) | 2022-12-16 |
Family
ID=84423298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211113308.8A Pending CN115475567A (en) | 2022-09-14 | 2022-09-14 | Production system and process of thin-sheet talcum powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115475567A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104722367A (en) * | 2013-12-20 | 2015-06-24 | 无锡新光粉体科技有限公司 | Medium mixing type wet grinding dispersing device |
| CN111663364A (en) * | 2020-06-17 | 2020-09-15 | 辽宁艾海滑石有限公司 | Preparation method of wet papermaking coating slurry liquid |
-
2022
- 2022-09-14 CN CN202211113308.8A patent/CN115475567A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104722367A (en) * | 2013-12-20 | 2015-06-24 | 无锡新光粉体科技有限公司 | Medium mixing type wet grinding dispersing device |
| CN111663364A (en) * | 2020-06-17 | 2020-09-15 | 辽宁艾海滑石有限公司 | Preparation method of wet papermaking coating slurry liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202052701U (en) | Powder concentrator capable of sorting out component materials having particles of rough, medium, and fine particle sizes | |
| CN102528933A (en) | Fine aggregate processing production system | |
| CN109046558A (en) | A kind of cement roller press final grinding system and working method | |
| CN103028497A (en) | Centrifugal classifier | |
| CN108435341B (en) | Grinding device for producing particle dispersions | |
| CN108452896A (en) | A kind of gap separate grinding machine | |
| CN211303714U (en) | Kaolin screening device for ceramic production | |
| CN101637743B (en) | Method for separating superfine powder | |
| CN202155314U (en) | Centrifugal horizontal cage type powder separator with forced vortex | |
| CN110694751A (en) | Centrifugal discharging horizontal sand mill and centrifugal discharging method | |
| CN207996722U (en) | A kind of slurry deaeration grinding device | |
| CN115475567A (en) | Production system and process of thin-sheet talcum powder | |
| CN1216172C (en) | Process for preparing heterogeneous cemented carbide | |
| CN205495761U (en) | Zinc oxide grinder | |
| CN206229448U (en) | A kind of dry type multistage intelligent agitating ball mill | |
| CN209254878U (en) | A kind of wet process italic continuous type ball mill | |
| CN204996494U (en) | No screen cloth formula intelligence nanometer system of grinding | |
| CN203235574U (en) | Rotational flow device | |
| CN205926063U (en) | Swirler overflow ore pulp grading plant | |
| CN201791674U (en) | Airflow classifier for bentonite | |
| CN213557749U (en) | Fine powder concentrator for producing sand with multiple sets of extension machines | |
| CN201783351U (en) | Improved centrifugal type nano bead mill | |
| CN201558812U (en) | Horizontal high speed precise grader | |
| CN212167714U (en) | Grinding production line | |
| CN114773880A (en) | Superfine heavy calcium carbonate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |