CN108955153A - The method and device that a kind of pair of hydrated calcium silicate is dehydrated - Google Patents
The method and device that a kind of pair of hydrated calcium silicate is dehydrated Download PDFInfo
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- CN108955153A CN108955153A CN201810523911.0A CN201810523911A CN108955153A CN 108955153 A CN108955153 A CN 108955153A CN 201810523911 A CN201810523911 A CN 201810523911A CN 108955153 A CN108955153 A CN 108955153A
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- drying
- calcium silicate
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- tubulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0404—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried
- F26B11/0418—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried the subdivision consisting of a plurality of parallel tubes, e.g. through which the material to be dried is conveyed in single or multi-pass fashion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The method dehydrated the invention discloses a kind of pair of hydrated calcium silicate and used device, the method combines continuous drying method using multisection type and aquation microporous calcium silicate is dehydrated and is dried, and the continuous drying multisection type combination successively includes that double blades are dry, roller tubulation is dry and expansion drying.Method of the invention solves the main problem of aquation microporous calcium silicate wet stock drying process, and drying means and device are easy to accomplish, technical process is simple and easy, smaller to existing tray drying process and equipment change, operability is higher, thus the present invention is easy to industrialization promotion.
Description
Technical field
The present invention relates to technical field of drying, and in particular to the method and dress that a kind of pair of hydrated calcium silicate is dehydrated
It sets.
Background technique
Aquation microporous calcium silicate powder body material belongs to one kind of hydrated calcium silicate, chemical formula CaOSiO2·nH2O,
Object phase composition is mainly C-S-H (I) type gel, C-S-H (II) type gel and other unformed substances etc., the material non-toxic without
Taste in not soluble in water, alcohol and aqueous slkali, but is highly soluble in strong acid.Due to the powder body material fine size, whiteness is high, and accumulates
Density and real density are lower, and thermal insulation property is preferable, therefore this kind of aquation microporous calcium silicate powder both can be applied to thermal insulation material
Field also can be used as chemical industry additive and be widely used in rubber, plastics, papermaking, paint field.
Artificial synthesized calcium silicates is usually by the silicon sources such as flyash desiliconization liquid, soluble glass of high modulus, sodium silicate solution and life
The calcium sources such as lime, milk of lime, diatomite and calcium hydroxide powder carry out hydrothermal synthesis.Aquation microporous calcium silicate powder particle it is microcosmic
Structure exists with discrete honeycomb cellular the morphology of the aggregate, the feature that surface has stratiform to crimp, and exists again between layer structure
Mutually spell the phenomenon that taking, taken just because of stratiform spelling thus construct porous honeycomb structure.Above structure feature is also in
The scrambling for revealing distribution, meets unbodied hydrated calcium silicate feature, and above-mentioned irregular aquation microporous calcium silicate is microcosmic
Structure, so that moisture is in the pore structure of material due to the more difficult dehydration of capillary phenomenon and drying.In addition, aquation microporous calcium silicate
There are a large amount of siloxies and silanol group functional group on surface, can generate combining closely for chemical bond with hydrone.Exactly therefore, exist
What hydrothermal synthesis aquation microporous calcium silicate obtained after filtration washing is aqueous 45%~86% paste wet stock, the wet object of paste
Moisture in material is more difficult to be removed and dries, can there are the following problems using conventional furnace drying method:
1, drying time is long
Aquation microporous calcium silicate lotion wet stock is dried using conventional heat transfer and thermal convection furnace drying method, when
Being dried to 5% or less material moisture content is a very very long process.Such as when using Electric heat oven, wet stock moisture content
18h or more is needed to can be only achieved moisture content 5% when 55%, under the conditions of 105 DEG C of oven temperature hereinafter, if wet stock moisture content is super
80% is crossed, this process needs more than for 24 hours under similarity condition.
2, material properties changes after drying
Under conventional heat transfer and thermal convection drying condition, aquation microporous calcium silicate is evaporated not due to uneven heating and moisture
Equilibrium will lead to serious hardened phenomenon, influence material microstructure and corresponding functional characteristic, play it can not original
Function.
3, specific energy consumption is huge
Aquation microporous calcium silicate lotion wet stock is dried using conventional heat transfer and thermal convection furnace drying method, by
In cannot effectively to chemical bond in aquation microcellular structure be connected moisture remove, amount of heat consumption and loss, at present compared with
It is not less than 1800Kcal/kg aquation microporous calcium silicate (over dry powder) for the corresponding comprehensive energy consumption of effective routine furnace drying method, both
Preferable drying effect is not achieved, the specific energy consumption of material drying is also very huge, causes the unnecessary waste of the energy and energy.
Summary of the invention
The purpose of the present invention is to provide the methods that a kind of pair of hydrated calcium silicate is dehydrated, existing to solve
The problem that material properties changes and specific energy consumption is huge after drying means drying time length, drying.
To achieve the above object, the technical solution of the present invention is as follows:
The method that a kind of pair of hydrated calcium silicate is dehydrated, the method combine continuous drying method pair using multisection type
Aquation microporous calcium silicate is dehydrated and is dried, and the continuous drying multisection type combination successively includes double blades drying, roller column
Pipe drying and expansion drying.
The present invention is to combine hydrated calcium silicate drying property, and the combination of three equipment is carried out using reaching preferable drying
Effect simultaneously reduces energy consumption.
The heat medium of first segment double blades drying process is steam or conduction oil.This section of drying can be to the cream of High water cut
Shape, the calcium silicates lotion that viscous, thermal stability is good, which apply shearing force, makes its dispersion, while passing through material and heating connecing for double blades
Touching and heat transfer, so that aqueous calcium silicates has carried out effective preheating and dehydration, drying.
The heat medium of second segment roller tubulation drying process is steam or conduction oil.Drying temperature scope control is to 143
~280 DEG C, steam medium heat source 0.4MPa~3.0MPa, dry tenacity is 3.5~45kg/m2·h。
Above-mentioned second segment roller tubulation drying is to be entered in comb and cylinder tubine to put by rotary joint by heat medium
Heat out, material are entered by addition mouth, and when device rotating operation, material absorbs heat, material by heat transfer, to flow evaporator
And institute's water content is heated and constantly evaporates.The water vapour evaporated is drawn in time to reduce atimodometer face pressure, drying process
Promote the progress of evaporation process by tiny structure in maintenance drying machine evaporative cylinder.Since cylinder constantly rotates, materials inside exists
It copies its evaporating surface under the action of pulling constantly to change, evaporation capillary phenomenon decrease enhances evaporation process.
As a preferred solution, the heat medium of the method is steam, heating air or conduction oil.
It as a preferred solution, is 45%~86% by the moisture content generated in aquation microporous calcium silicate synthesis process
Paste wet stock, be quantitatively adding in three-stage drier by quantitative helixes feed equipment and carry out continuous drying operation, can made
Use 0.4MPa~3.0MPa saturated vapor, 160~280 DEG C of dry-heat airs and 160~260 DEG C of heating conduction oils as heat source
Carry out directly or indirectly heat exchange drying operation.
143 DEG C~280 DEG C of the drying temperature range of equipment, as a preferred solution, the method also includes as follows
Step: equipment carries out cooling operations using 20 DEG C~45 DEG C cooling waters after dry, and aquation microporous calcium silicate lotion is in three sections of equipment
Heat and mass transfer process is completed in drying process, achievees the purpose that dehydration, drying and cooling.
As a preferred solution, the method also includes following steps:
The aquation microporous calcium silicate powder body material dried is discharged by the discharge gate of type expansion drier, object in flash process
Material by the elegant dry dust into air of the moisture of thermal evaporation and part, by be arranged in the steam drain at the top of type expansion drier into
It is collected after row dehumidification treatments and by dust, the recycling of dry-heat air air.
As a preferred solution, during roller tubulation is dry, drying temperature is 143~280 DEG C, and steam is situated between
The pressure of matter heat source is 0.4MPa~3.0MPa, and dry tenacity is 3.5~45kg/m2·h。
As a preferred solution, the dry detailed process of roller tubulation are as follows: by heat medium by rotary joint into
Enter and release heat in comb and cylinder tubine, material is entered by addition mouth, when device rotating operation, material by heat transfer,
Heat is absorbed to flow evaporator, material and institute's water content are heated and constantly evaporate；The water vapour evaporated is drawn in time to drop
Low atimodometer face pressure, drying process promote the progress of evaporation process by tiny structure in maintenance drying machine evaporative cylinder.
Three-stage combines the applicable dried object of continuous drying method as synthesis aquation microporous calcium silicate lotion, and moisture content is
45%~86%, after the continuous drying method of three-stage combination is dehydrated and is dried, aquation microporous calcium silicate moisture content can drop
As low as 5% hereinafter, completing whole drying time 2.5~5 minutes, comprehensive energy consumption is lower than 950Kcal/kg aquation microporous calcium silicate
(over dry powder).
A second object of the present invention is to provide a kind of methods dehydrated as described above to hydrated calcium silicate
Used device, described device include at least one double blades drying device, at least one roller tubulation drying device and extremely
A few type expansion drier；The double blades drying device is used for double blades drying process, the roller tubulation drying device
For roller tubulation drying process, the type expansion drier is used for expansion drying process.
Drying process first segment uses double blades drying device, and the device is by cylinder, double blades, main shaft, discharge funnel, biography
Motivation structure and auxiliary element and electric-control system composition, specific connection type belong to the prior art.
Drying process second segment use roller tubulation drying device, the device by cylinder, interior heating tubulation beam, be surrounded on cylinder
External heat tubine, rolling ring, support roller, gear wheel, transmission mechanism and the auxiliary element and electric-control system of internal side are constituted, specific to connect
Mode belongs to the prior art.Above-mentioned interior heating column beam tube is made of carbon steel and stainless steel, radial fin arrangement.
The double blades of above-mentioned first segment are dry to carry out object by helical feed mode between the drying of second segment roller tubulation
Material transmission.Material has become the block material of evacuation shape after roller tubulation is dry, and using gravitational difference, (i.e. the dry setting of tubulation exists
Eminence, discharge port lower section face flash distillation dryer feed inlet) pass through the direct blanking of delivery pipe.
Three-stage combines continuous drying method and aquation microporous calcium silicate is dehydrated and is dried, and third section uses expansion drying
Device is dried.
As a preferred solution, pass through spiral transferring between the double blades drying device and roller tubulation drying device
Mode is sent to carry out material transferring.
As a preferred solution, the roller tubulation drying device includes interior heating tubulation beam, the interior heating column
The material of beam tube is made of carbon steel and stainless steel, radial fin arrangement.
The present invention has the advantage that
1, to the drying time of aquation microporous calcium silicate lotion wet stock from the 16h of common static intermittently drying mode with
On, it substantially shortens to 2.5~5 minutes, and meet the basic demand of industrialized production, has the large-scale continuous work of realization
The condition of industry improves production efficiency and treating capacity while guaranteeing dries quantity, and reduces the energy of unit drying production capacity
Consumption.
2, three-stage combines continuous drying method and is directed to lotion hydrated calcium silicate wet stock characteristic, and segmentation carries out heated drying, does
It is only passed through a small amount of recirculated hot air in drier during dry, tail gas carrying amount is seldom, therefore its thermal efficiency is up to 65% or more.
In addition, the drying comprehensive energy consumption of aquation microporous calcium silicate wet stock is lower than 950Kcal/ by reasonably dispersion and drying mode
Kg aquation microporous calcium silicate (over dry powder) is compared with the traditional method so that drying energy consumption is greatly lowered, has saved a large amount of energy
Source and heat.
3, dry operating temperature in the continuous dynamic drying process of three-stage, is filled in 143 DEG C~280 DEG C interval ranges
Componental movement conduction heat, advection heat and radiant heat carry out hot transmitting to material to be dried, and by adjusting the tool of different drying section layers
Temperature curve can combine material internal capillary moisture and material surface parts siloxy and silanol group chemical functional groups
Water effective removing, meanwhile, and material microstructure and properties itself will not be had an impact, improve aquation microporous calcium silicate
The dry mass of hydrous material solves the problems, such as that it carries moisture and is difficult to removing and drying.
In conclusion process of the invention solves mainly asking for aquation microporous calcium silicate wet stock drying process
Topic, and drying means and device are easy to accomplish, technical process is simple and easy, changes to existing tray drying process and equipment
Smaller, operability is higher, thus the present invention is easy to industrialization promotion.
Detailed description of the invention
Fig. 1 is differential thermal-thermogravimetric curve of aquation microporous calcium silicate powder in drying process.
Fig. 2 is the micro-structure diagram of aquation microporous calcium silicate powder.
Specific embodiment
Aquation microporous calcium silicate powder of the present invention has porosity, the high adsorption structure of higher whiteness and purity
Property inorganic material.Its higher specific surface area, biggish aperture, porosity and porosity characteristics make it show high oil absorption water suction
Property and stronger reinforcing effect.It is tested by many experiments, apparent data target and traditional chemical filler grade commodity GCC, PCC
Compare, the main quality Heterosis of calcium silicates exists: large specific surface area, settling volume is high, specific gravity is small, and wearing valve is low (1.2mg),
Retention of whiteness is good, and loss on ignition is small, from apparent data target analyze, specific surface area, ageing-resistant whiteness, wearing valve, Zeta potential,
Settling volume, chemical component composition etc. are superior to general chemical filler.
The crystallization degree of aquation microporous calcium silicate powder is relatively low, and object phase constituent mainly contains unbodied aquation
Gel of calcium silicate and be the composition such as C-S-H (I) type gel, C-S-H (II) type gel, in C-S-H gel [SiO4]4-Silicon oxygen four
Face body constitutes layer structure, and [SiO4]4-The single-stranded of formation has been separately formed each layer, is then by calcium original between layers
Son carries out the multilayered structure constituted after bridging.There are siloxies and silanol group functional group for material surface as a result, there is very strong reinforcement
Performance and chemical bonding performance, while there is stronger chemisorption performance.C-S-H gel and C- in aquation microporous calcium silicate
S-H (I) type or C-S-H (II) type individually or are mixed.
The microstructure of aquation microporous calcium silicate powder particle exists with discrete honeycomb cellular the morphology of the aggregate, surface
There is the feature of stratiform curling, spell the phenomenon that taking there is mutual again between layer structure, takes thus construct just because of stratiform spelling
Porous honeycomb structure out.Fig. 2 is the micro-structure diagram of aquation microporous calcium silicate powder.4 figures are hydrated calcium silicates of the same race
The microcosmic result figure of powder, amplification factor are different.
Above structure feature also shows the scrambling of distribution, meets unbodied hydrated calcium silicate feature, and with crystalline substance
Body structure is different, therefore the crystallinity of aquation microporous calcium silicate powder and the degree of order be not high.Aquation microporous calcium silicate filler
Loose porous and low-density characteristic cause its crystal structure rigidly lower, this also explains aquation microporous calcium silicates to compare
Possess lower wearing valve compared with other routine chemical fillers.Not due to the porosity of aquation microporous calcium silicate powder and gap distribution
Being widely present of uniformity and these gaps all makes the filler be easy to moisture is made to be present in above-mentioned microscopic void space to work as
In, and due to the capillarity under special space structure moisture and material itself are combined closely.At the same time, porous
Although the particle gap that surface and aggregation are formed constitutes aquation microporous calcium silicate powder surface, there are a large amount of siloxies and silanols
Base functional group can generate combining closely for chemical bond with hydrone, bring extremely difficult problem to the removal of moisture.
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
Continuous drying method is combined the present embodiment provides a kind of use three-stage to dry aquation microporous calcium silicate material
Method, the method combines continuous drying method using multisection type and aquation microporous calcium silicate is dehydrated and is dried, described more
Continuous drying segmentation combination successively includes that double blades are dry, roller tubulation is dry and expansion drying.Fig. 1 shows water in drying process
Change differential thermal-thermogravimetric curve of microporous calcium silicate powder.The main reason for downlink curve represents the weightless process of material, weightless be
Dehydration is weightless, wherein the inflection point of three variations represents the dehydration stage obvious three times, it is corresponding that dry institute is namely provided
Need the foundation of temperature and energy balane.
The method carries out directly or indirectly heat exchange drying as heat source using the saturated vapor of 0.4MPa~3.0MPa.
During roller tubulation is dry, drying temperature is 200 DEG C, and the pressure of steam medium heat source is 1.7MPa, is done
Dry intensity is 25kg/m2·h。
The method also includes following steps: being cooled down using 30 DEG C of cooling waters to equipment after drying.
The method also includes following steps:
The hot wind air that expansion drying process is discharged carries out dehumidification treatments and dust removal process, obtained dry-heat air air
It is recycled.
Device used in the above-mentioned method dehydrated to hydrated calcium silicate includes that at least one double blades is dry
Device, at least one roller tubulation drying device and at least one type expansion drier；The double blades drying device is for double
Blade drying process, the roller tubulation drying device are used for roller tubulation drying process, and the type expansion drier is for dodging
Steam drying process.
Material transferring is carried out by helical feed mode between the double blades drying device and roller tubulation drying device.
The roller tubulation drying device includes interior heating tubulation beam, and the interior heating column beam tube is by carbon steel and stainless steel group
At.
Embodiment 2
During roller tubulation is dry, drying temperature is 143 DEG C, and the pressure of steam medium heat source is 0.4MPa, is done
Dry intensity is 3.5kg/m2·h。
The method also includes following steps: being cooled down using 20 DEG C of cooling waters to equipment after drying.
Other content and embodiment 1 are identical.
Embodiment 3
During roller tubulation is dry, drying temperature is 280 DEG C, and the pressure of steam medium heat source is 3.0MPa, is done
Dry intensity is 45kg/m2·h。
The method also includes following steps: being cooled down using 45 DEG C of cooling waters to equipment after drying.
Other content and embodiment 1 are identical.
Embodiment 4
The method that a kind of pair of hydrated calcium silicate is dehydrated, the method is using 180 DEG C of dry-heat air as heat
Source carries out directly or indirectly heat exchange drying.
Other content and embodiment 1 are identical.
Embodiment 5
The method that a kind of pair of hydrated calcium silicate is dehydrated, the method is using 250 DEG C of dry-heat air as heat
Source carries out directly or indirectly heat exchange drying.
Other content and embodiment 1 are identical.
Embodiment 6
The method that a kind of pair of hydrated calcium silicate is dehydrated, the method use 180 DEG C of heating conduction oil conduct
Heat source carries out directly or indirectly heat exchange drying.
Other content and embodiment 1 are identical.
Embodiment 7
The method that a kind of pair of hydrated calcium silicate is dehydrated, the method use 230 DEG C of heating conduction oil conduct
Heat source carries out directly or indirectly heat exchange drying.
Other content and embodiment 1 are identical.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (9)
1. the method that a kind of pair of hydrated calcium silicate is dehydrated, which is characterized in that the method is connected using multisection type combination
Continuous seasoning is dehydrated and is dried to aquation microporous calcium silicate, and the multisection type combination is continuous drying successively dry including double blades
Dry, roller tubulation drying and expansion drying.
2. the method according to claim 1 dehydrated to hydrated calcium silicate, which is characterized in that the method
Heat medium is steam, heating air or conduction oil.
3. the method according to claim 1 dehydrated to hydrated calcium silicate, which is characterized in that the method is adopted
Made with the saturated vapor of 0.4MPa~3.0MPa, 160~280 DEG C of dry-heat air or 160~260 DEG C of heating conduction oil
Directly or indirectly heat exchange drying is carried out for heat source.
4. the method according to claim 1 dehydrated to hydrated calcium silicate, which is characterized in that the method is also
Include the following steps: to cool down equipment after drying using 20 DEG C~45 DEG C of cooling water.
5. the method according to claim 1 dehydrated to hydrated calcium silicate, which is characterized in that the method is also
Include the following steps:
The hot wind air that expansion drying process is discharged carries out dehumidification treatments and dust removal process, obtained dry-heat air air circulation
It uses.
6. the method according to claim 1 dehydrated to hydrated calcium silicate, which is characterized in that in roller tubulation
In dry process, drying temperature is 143~280 DEG C, and the pressure of steam medium heat source is 0.4MPa~3.0MPa, dry tenacity
For 3.5~45kg/m2·h。
7. a kind of dress as used in the method for any of claims 1-6 dehydrated to hydrated calcium silicate
It sets, which is characterized in that described device includes at least one double blades drying device, at least one roller tubulation drying device and extremely
A few type expansion drier；The double blades drying device is used for double blades drying process, the roller tubulation drying device
For roller tubulation drying process, the type expansion drier is used for expansion drying process.
8. the device according to claim 7 dehydrated to hydrated calcium silicate, which is characterized in that the double blades
Material transferring is carried out by helical feed mode between drying device and roller tubulation drying device.
9. the device according to claim 7 dehydrated to hydrated calcium silicate, which is characterized in that the roller column
Pipe drying device includes interior heating tubulation beam, and the material of the interior heating column beam tube is made of carbon steel and stainless steel.
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| CN201810523911.0A CN108955153A (en) | 2018-05-28 | 2018-05-28 | The method and device that a kind of pair of hydrated calcium silicate is dehydrated |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202755254U (en) * | 2012-07-12 | 2013-02-27 | 成都依瑞克科技有限公司 | Combined type drying system |
| CN203432258U (en) * | 2013-07-09 | 2014-02-12 | 石家庄鸿宇化学工程技术有限公司 | Secondary drying unit for nanoscale superfine calcium carbonate |
-
2018
- 2018-05-28 CN CN201810523911.0A patent/CN108955153A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202755254U (en) * | 2012-07-12 | 2013-02-27 | 成都依瑞克科技有限公司 | Combined type drying system |
| CN203432258U (en) * | 2013-07-09 | 2014-02-12 | 石家庄鸿宇化学工程技术有限公司 | Secondary drying unit for nanoscale superfine calcium carbonate |
Non-Patent Citations (1)
| Title |
|---|
| 潘永刚等: "《现代干燥技术 第二版》", 31 May 2007 * |
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Application publication date: 20181207 |
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| RJ01 | Rejection of invention patent application after publication |