CN108114806B - A kind of diatomite dry powder - Google Patents
A kind of diatomite dry powder Download PDFInfo
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- CN108114806B CN108114806B CN201711381423.2A CN201711381423A CN108114806B CN 108114806 B CN108114806 B CN 108114806B CN 201711381423 A CN201711381423 A CN 201711381423A CN 108114806 B CN108114806 B CN 108114806B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
Abstract
The invention discloses a kind of diatomite dry powder, belong to building material technical field.Diatomite dry powder of the invention, it is cleaned and is made using diatomite ore, by sedimentation separation after diatomite ore scouring, obtain diatomite, diatomite dry powder is made after being dried using vacuum freeze-drying method in the diatomite, after scouring diatomite obtained is dried using vacuum freeze-drying method, through electron microscope observation, its homogeneity and specific surface area improve significantly, and improve its noise reduction, absorption, adjusting air humidity and the technical effect for removing formaldehyde.It solves the problems, such as in diatomite ore scrubbing process in the prior art to the shape of micropore and structure without being effectively improved.
Description
Technical field
The present invention relates to building material technical field more particularly to a kind of diatomite dry powder.
Background technique
Diatomite is that a kind of have that natural nano microcellular structure, large specific surface area, heap density is small, main component is unformed
SiO2Natural siliceous porous nonmetallic mineral, be widely used in the filtering of beer, beverage, drinking water, commercial grease etc. with
And the fields such as sewage treatment, building materials, chemical industry, agricultural, rubber and plastic filler, papermaking filler, it is that many industries are essential
Functional mineral material, has broad application prospects.
China is diatomite reserves big country, is only second to the U.S. in the world, occupies second.But the diatomite reserves in China
In, the overwhelming majority is Low grade resource, and the direct applied high-quality diatomite resource of energy is less.In exploitation level-one diatomite resource
In the process, 75% or more low-grade diatomite resource is discarded, not only the diatomite resource of serious waste preciousness, but also is polluted
Local environment.The comprehensive utilization of low-grade diatomite ore and deep process technology are the current and following diatomite development and utilization industries
It is badly in need of.In low-grade diatomite physical upgrading, scouring is very important link.The effect of scouring mainly makes ore
Mill stripping is generated between grain and particle, achievees the purpose that cleaning, polishing and size degradation.
Since diatomite is usually to be formed by the remains deposition of unicellular water plant diatom, the uniqueness of this diatom
The free silica in water can be absorb and form its anatomy, deposit after its end of life, formed under certain geological conditions
Diatomite Deposit in the production of existing diatomite, uses after fine powder is crushed to after generally being dried after scouring, just because of
The long-term deposition of Diatomite Deposit, although internal distribution micropore, micro-pore shape and not of uniform size under microscope is applied particularly to
When building materials, noise reduction, absorption, adjusting air humidity and remove formaldehyde effect it is to be improved.
Through retrieving, Chinese patent application, application number: 201210219191.1, publication date: 2012.10.10 discloses one
The control method of kind diatomite ore scrubbing process, belongs to ore-dressing technique control technology field.The invention is characterized in that: including to
Doses control, clean concentration control, pH regulator dosage control, clean strength control, dispersant dosage control, sequential control and
Controller determines feeding coal according to the diatom content of diatomite original ore, adjusts water supply electrically operated valve on this basis, and control is cleaned
Concentration is 30%~40%, adjusts pH regulator metering pump, makes slurry pH 9~10, changes the 1st~4 slot of swaging machine and cleans
The working frequency of motor realizes the control for cleaning intensity, and suitable dispersing agent is added according to concentration is cleaned, makes clay mineral in outstanding
Floating dispersity is conducive to subsequent centrifugal sedimentation sorting.The invention keeps clay removal rate height, the pore plugging of diatomite ore bright
Aobvious improvement, specific surface area significantly improve, breakage rate increases the less scouring particularly suitable for clay matter mineral.But the invention is only
The control for only laying particular emphasis on scouring process improves micro-pore shape and size without effective.
Summary of the invention
1. technical problems to be solved by the inivention
In diatomite ore scrubbing process in the prior art to the shape of micropore and structure without being effectively improved aiming at the problem that, this
Invention provides a kind of diatomite dry powder, after it is dried scouring diatomite obtained using vacuum freeze-drying method,
The homogeneity of microcellular structure and shape is improved, and reaches and improves its noise reduction, absorption, adjusting air humidity and removal formaldehyde
Effect.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of diatomite dry powder is cleaned using diatomite ore and is made, and by sedimentation separation after diatomite ore scouring, obtains silicon
Algae essence soil, the diatomite are made diatomite dry powder after being dried using vacuum freeze-drying method, utilize vacuum refrigeration
After scouring diatomite obtained is dried in seasoning, through electron microscope observation, homogeneity and specific surface area are significantly
It improves, and improves its noise reduction, absorption, adjusting air humidity and the technical effect for removing formaldehyde.
Above scheme is improved further, the granularity of diatomite dry powder is 200~300 mesh, is applied to construction material
When, it is consistent with other pulvis, such as the fineness of mountain flour, titanium dioxide, achieve the purpose that avoid staticly settling.
Above scheme is improved further, is prepared by following steps:
Step 1: classification: the diatomite ore in diatomite original ore storehouse is transported to classifying screen through belt conveyor and is classified；
Step 2: cleaning: the diatomite ore for removing magnetic mine is transferred to swaging machine scouring；
Step 3: screening: material is transferred to spin vibration sieve and is screened after scouring；
Step 4: separation: sedimentation obtains diatomite underflow in subsider；
Step 5: paving disk: upper material frame after diatomite underflow is laid in material disc；
Step 6: quick-frozen: will be carried out in material frame push-in quick freezing repository quick-frozen；
Step 7: freeze-drying: being lyophilized in the material push-in vacuum freeze drying cabin after quick-frozen；
Step 8: crushing: the material after freeze-drying being carried out to crush to obtain diatomite dry powder.
Above scheme is improved further, further comprising the steps of between step 1 and two:
(1) select: oversize enters conveyer picker, manually sorts out impurity；
(2) it is crushed: selecting rear raw ore and be crushed；
(3) magnetic separation: material and the screenings of step 1 are transferred to magnetic separator and carry out magnetic separation after broken.
Above scheme is improved further, swaging machine described in step 2 is three slot type swaging machines；Institute in step 3
Spin vibration sieve is stated as the double-deck spin vibration sieve；The concentration of diatomite underflow described in step 4 is 55%~70%；Step 5 middle berth disk is thick
Degree is 4~5cm；Quick freezing temperature is -38~-42 DEG C in step 6.
Above scheme is improved further, the lyophilized technique of vacuum freeze drying cabin described in step 7 is ladder liter
Warm formula temperature curve.
Above scheme is improved further, ladder-elevating temperature formula temperature curve are as follows:
A, room temperature keeps 60~90min, is evacuated within 100Pa；
B, plate temperature is warming up to 40~45 DEG C of 70~90min of holding, vacuum is kept within 100Pa；
C, plate temperature is warming up to 50~55 DEG C of 120~150min of holding, vacuum is kept within 100Pa；
D, plate temperature is warming up to 70~75 DEG C of 80~100min of holding, vacuum is kept within 80Pa；
E, plate temperature is warming up to 80~85 DEG C of 30~50min of holding, vacuum is kept within 40Pa；
F, plate temperature is cooled to 55 DEG C, vacuum is kept within 40Pa, and the mild temperature of charge of plate is protected in two horizontal parallel lines
Hold vacuum breaker export after 30~40min.
Above scheme is improved further, the condenser temperature of vacuum freeze drying cabin is -38~-42 DEG C；Step F plate
By cooling water forced cooling when temperature drop temperature.
Above scheme is improved further, adds dispersing agent in diatomite underflow described in step 7.
Above scheme is improved further, dispersing agent is polyurethane kind, and dosage is diatomite underflow gross weight
0.1%~0.3%.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, have the following beneficial effects:
(1) diatomite dry powder of the invention is dried using vacuum freeze-drying method to diatomite obtained is cleaned
Afterwards, through electron microscope observation, the homogeneity and specific surface area of micropore improve significantly, and improve its noise reduction, absorption, adjusting
Air humidity and the technical effect for removing formaldehyde；Moreover, be easily broken after the diatomite freeze-drying of vesicular texture, it can be with
According to the granularity requirements of other auxiliary materials, it is crushed to same fineness；
(2) diatomite dry powder of the invention, the granularity requirements of 200~300 mesh, when being applied to construction material, with other powder
Agent, such as the fineness of mountain flour, titanium dioxide are consistent, achieve the purpose that avoid staticly settling；
(3) diatomite dry powder of the invention, classification → scouring → screening → separation → quick-frozen → each step of freeze-drying are progressive
It carries out, to improve the purity and extracting rate of diatomite, and improves production efficiency, reduce production cost；
(4) diatomite dry powder of the invention, select → be crushed → magnetic separation the step of, impurity and invalid component is clear in advance
It removes, avoids increasing freeze-drying cost；
(5) diatomite dry powder of the invention selects three slot type swaging machines, is wiped in advance respectively in conjunction with lyophilized technique feature
The step of → smart wiping → tail wiping, while reducing freeze-drying cost, improve finished product extracting rate；Diatomite underflow concentration is 55%
~70%, paving disc thickness is 4~5cm, is the preferred trial range that inventor takes into account freeze-drying cost and finished product extracting rate；Quick freezing temperature
It is -38~-42 DEG C, then is the best quick freezing temperature range that inventor obtains after testing, is diatomite maximum micro ice crystal
The temperature range of band is generated, is laid a good foundation for the generation of uniform micro；
(6) diatomite dry powder of the invention, ladder-elevating temperature formula temperature curve, with common ladder cooling-down type temperature curve phase
It instead, is that inventor combines the creative crystallization of diatomite feature itself to ensure that in conjunction with -38~-42 DEG C of quick freezing temperature
The generation of even micropore；
(7) diatomite dry powder of the invention, ladder-elevating temperature formula temperature curve detailed description are that inventor combines paving disc thickness
For 4~5cm, ladder-elevating temperature formula temperature curve has further been refined, ensure that entire technique is completed in 9 hours, has further been dropped
Low production cost；
(8) diatomite dry powder of the invention, condenser temperature are -38~-42 DEG C consistent with quick freezing temperature, avoid capture water
The secondary distillation divided；By cooling water forced cooling, distillation latter stage plate heat is avoided to be more than heat required for distilling and influence micropore
Generation；
(9) diatomite dry powder of the invention adds dispersing agent in diatomite underflow, further increases the equal of micropore generation
One property；
(10) diatomite dry powder of the invention, dispersing agent are polyurethane kind, and in conjunction with diatomite characteristic, polyurethane kind molecule can
To penetrate into diatomite micropore, to improve suspension effect.
Detailed description of the invention
Fig. 1 is the diatomite microcellular structure under the electron microscope of the prior art；
Fig. 2 is the diatomite dry powder microcellular structure under electron microscope of the present invention.
Specific embodiment
To further appreciate that the contents of the present invention, in conjunction with attached drawing, the present invention is described in detail.
Embodiment 1
A kind of diatomite dry powder of the present embodiment, manufacturing process are as follows: the diatomite ore in diatomite original ore storehouse is passed through
Batcher feeds belt conveyor, is transported to classifying screen, and oversize enters conveyer picker, by manually sort out the broken film of branch, plastics,
After the sundries such as iron wire and ratchel, diatomite ore feeds crusher, and the screenings of broken material and classifying screen is defeated by belt
Machine is sent to feed magnetic separator, the diatomite ore after selecting magnetic material enters surge bunker, then by constant feeder to feed measuring belt defeated
Machine is sent, diatomite ore is fed into four slot swaging machines, by the way that in feeding inlet water supplement, pulp density is adjusted to 35%~40%,
NaOH is added in the first slot, makes pH value 9~10, the ore pulp after swaging machine enters thinning tank, and water supplement makes concentration
20%~25%, then the double-deck spin vibration sieve is pumped to by slurry, sieve diameter is respectively 80 mesh and 200 mesh, in screening process, is added
Enter suitable water to improve screening effect, the material greater than 80 mesh is coarse sand, and the material less than 200 mesh flow to buffering by pipeline
Tank, 200 mesh~80 mesh intermediate material enter two slot swaging machines, and being adjusted to concentration by water supplement is 35%~40%, in two slots
The first slot be added NaOH, make pH value 9~10, the ore pulp after swaging machine enters single layer spin vibration sieve, sieve diameter 200
Suitable water is added in screening process in mesh, and the oversize greater than 200 mesh is fine sand, and screenings enters surge tank, buffering
Suitable dispersing agent is added in tank, being cleaned in surge tank and fully dispersed diatomite ore pulp further pass through sedimentation and divide
From, obtain diatomite, diatomite dried, crushed again after diatomite powder, sampling one.
Through detecting, diatom content≤80%, SiO of diatomite original ore2Content≤80%, Fe3O4Content >=3.04%, it is former
Specific surface area≤19m of mine2/ g, after cleaning, with the diatom content for the diatomite that centrifugal sedimentation sorting obtains after dry
>=81%, SiO2Content >=81%, Fe3O4Content≤1.6%, yield >=75%, specific surface area >=20m2/g。
Embodiment 2
A kind of diatomite dry powder of the present embodiment, diatomite original ore with embodiment 1, basic step with embodiment 1, it is different and
It thes improvement is that: using sedimentation separation after diatomite ore scouring, obtaining diatomite, the diatomite is using vacuum
Diatomite dry powder is made after being dried in freeze-drying, is carried out using vacuum freeze-drying method to diatomite obtained is cleaned
After drying, through electron microscope observation, as shown in the comparison diagram of Fig. 1 and 2, homogeneity and specific surface area improve significantly, and mention
High its noise reduction, absorption, adjusting air humidity and the technical effect for removing formaldehyde.
Embodiment 3
A kind of diatomite dry powder of the present embodiment, for diatomite original ore with embodiment 2, manufacturing process is as follows:
Step 1: classification: the diatomite ore in diatomite original ore storehouse is transported to classifying screen through belt conveyor and is classified；
Step 2: selecting: oversize enters conveyer picker, manually sorts out impurity；
Step 3: broken: selecting rear raw ore and be crushed；
Step 4: magnetic separation: material and the screenings of step 1 are transferred to magnetic separator and carry out magnetic separation after broken
Step 5: cleaning: the diatomite ore for removing magnetic mine is transferred to swaging machine scouring, and swaging machine is three slot type swaging machines,
Respectively prewash tank, fine purifiation slot and tail washing trough, after wherein prewash tank adds water, pulp density is adjusted to 30% or so, stirring motor
Revolving speed is 100 revs/min, and adjusting pH value is 9, rotates 10 minutes or so, is mutually cleaned using diatomite ore itself particle
The impurity such as desanding, soil are removed, the double-deck spin vibration sieve are pumped to by slurry, sieve diameter is respectively 80 mesh and 200 mesh, in screening process
In, suitable water is added to improve screening effect, the material greater than 80 mesh is coarse sand as tailings glass, less than 200 purpose objects
Material flow to surge tank by pipeline, and 200 mesh~80 mesh intermediate material enters fine purifiation slot swaging machine, is adjusted to concentration by water supplement
It is 50%, fine purifiation slot stirring motor revolving speed is 200 revs/min, and adjusting pH value is 8, after rotation 20 minutes or so, then by Pulp pump
It send to tail washing trough, pulp density adds water to be adjusted to 40% or so, and tail washing trough stirring motor revolving speed is 150 revs/min, rotates 5 minutes
Behind left and right；
Step 6: screening: after tail washing trough is cleaned, material being transferred to single layer spin vibration sieve, sieve diameter is 200 mesh, is being sieved
In the process, suitable water is added, the oversize greater than 200 mesh is fine sand, and screenings enters surge tank；
Step 7: separation: suitable dispersing agent being added in surge tank, being cleaned in surge tank and fully dispersed silicon
Diatomaceous earth ore pulp further passes through sedimentation separation, obtains diatomite underflow, and diatomite underflow concentration is 55%~70%, this reality
Apply is 55% in example；
Step 8: paving disk: upper material frame after diatomite underflow is laid in material disc, paving disc thickness are 5cm；
Step 9: quick-frozen: will material frame be pushed into quick freezing repository in carry out it is quick-frozen, quick freezing temperature be -42 DEG C；
Step 10: freeze-drying: being lyophilized in the material push-in vacuum freeze drying cabin after quick-frozen；
Step 11: crushing: the material after freeze-drying being carried out to crush to obtain diatomite dry powder, sampling two.
Through detecting, diatom content >=86%, SiO of the diatomite dry powder obtained after lyophilization2Content >=86%, Fe3O4
Content≤1.0%, yield >=89%, specific surface area >=29m2/ g has the function of very strong reduction noise, can effectively absorb
The high frequency segment being harmful to the human body, and low frequency of decaying is made an uproar function.Its effect be equivalent to condition of equivalent thickness cement mortar and slabstone 3
Times or more, while can shorten 70% the reverb time, be greatly reduced noise to the person harm, one can be created
Quiet sleep environment.The pyroconductivity of diatom dry powder is very low, and body is ideal heat preserving and insulating material, has extraordinary heat preservation
Heat-proof quality, heat insulation are 8 times of condition of equivalent thickness cement mortar, moreover, its unique " molecular sieve " structure is strengthened,
It can be generated after touching the moisture in air " water fall effect ", to constantly release the negative oxygen ion beneficial to human body.
Embodiment 4
A kind of diatomite dry powder of the present embodiment, diatomite original ore is the same as embodiment 2, the same embodiment of basic step of production
3, different and the improvement is that:
Step 7: separation: diatomite underflow concentration is 70%；
Step 8: paving disk: paving disc thickness is 4cm；
Step 9: quick-frozen: quick freezing temperature is -38 DEG C；
The lyophilized technique of vacuum freeze drying cabin is ladder-elevating temperature formula temperature curve in step 10:
A, room temperature keeps 60min, is evacuated within 100Pa；
B, plate temperature is warming up to 45 DEG C of holding 90min, vacuum is kept within 100Pa；
C, plate temperature is warming up to 55 DEG C of holding 120min, vacuum is kept within 100Pa；
D, plate temperature is warming up to 70 DEG C of holding 100min, vacuum is kept within 80Pa；
E, plate temperature is warming up to 85 DEG C of holding 30min, vacuum is kept within 40Pa；
F, plate temperature is cooled to 55 DEG C, vacuum is kept within 40Pa, and the mild temperature of charge of plate is protected in two horizontal parallel lines
Vacuum breaker export after 40min is held, samples three after crushing.
Through detecting, diatom content >=86%, SiO of the diatom dry powder obtained after lyophilization2Content >=86%, Fe3O4Contain
Amount≤1.0%, yield >=89%, specific surface area >=33m2/g。
Embodiment 5
A kind of diatomite dry powder of the present embodiment, diatomite original ore is the same as embodiment 2, the same embodiment of basic step of production
4, different and the improvement is that:
Step 7: separation: diatomite underflow concentration is 60%；
Step 8: paving disk: paving disc thickness is 4.5cm；
Step 9: quick-frozen: quick freezing temperature is -40 DEG C；
The lyophilized technique of vacuum freeze drying cabin is ladder-elevating temperature formula temperature curve in step 10:
A, room temperature keeps 90min, is evacuated within 100Pa；
B, plate temperature is warming up to 40 DEG C of holding 70min, vacuum is kept within 100Pa；
C, plate temperature is warming up to 50 DEG C of holding 150min, vacuum is kept within 100Pa；
D, plate temperature is warming up to 75 DEG C of holding 80min, vacuum is kept within 80Pa；
E, plate temperature is warming up to 80 DEG C of holding 50min, vacuum is kept within 40Pa；
F, by plate temperature by cooling water forced cooling to 55 DEG C, vacuum is kept within 40Pa, and the mild temperature of charge of plate is in two
Horizontal parallel line keeps vacuum breaker export after 30min.
Step 11: the material after freeze-drying is carried out to crush to obtain diatomite dry powder, fineness is 200~300 mesh, sampling four.
Through detecting, specific surface area >=35m of the diatom dry powder obtained after lyophilization2/g。
Embodiment 6
A kind of diatomite dry powder of the present embodiment, diatomite original ore is the same as embodiment 2, the same embodiment of basic step of production
5, it is different and the improvement is that: dispersing agent to be added in diatomite underflow described in step 7, dispersing agent is polyurethane kind, is used
Amount is the 0.1%~0.3% of diatomite underflow gross weight, and in conjunction with diatomite characteristic, polyurethane kind molecule can be penetrated into diatom
In native micropore, to improve suspension effect, avoid it is quick-frozen during layering.And after the completion of subsequent lyophilized technique and crushing,
Sampling five.
Embodiment 7
It takes the sample one in above embodiments to sample five, the test of formaldehyde removal efficiency is carried out, by sample one to sample five by same
Formula roll-on-type diatom ooze is made, then turn on climate box hatch door on round brush to ceramic wafer, one piece of release has been put in the inside in advance
The density board of formaldehyde, and initial concentration of formaldehyde is 1.84mg/m after having measured balance3, then will coat diatom ooze
Ceramic wafer puts in, and closes hatch door, waits 48 hours silently even 96 hours, looks at what kind of can occur for the concentration of formaldehyde of the inside
Variation:
It can be apparent from by the above contrast table, the diatomite dry powder for having used sample two made from lyophilized technique to sample five is answered
After roll-on-type diatom ooze, formaldehyde removal rate has clear improvement than sample one, moreover, having apparent removal to be saturated with sample one
The problem of (after 96 hours, residues of formaldehyde rises instead) spends, sample two to sample five is at least in 96 hours without generating adsorption saturation
The case where.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (5)
1. a kind of diatomite dry powder is cleaned using diatomite ore and is made, which is characterized in that diatomite ore divides after cleaning by sedimentation
From obtaining diatomite, diatomite dry powder is made after being dried using vacuum freeze-drying method in the diatomite；
The granularity of the diatomite dry powder is 200~300 mesh；
And it is prepared by following steps:
Step 1: classification: the diatomite ore in diatomite original ore storehouse is transported to classifying screen through belt conveyor and is classified；
Step 2: cleaning: the diatomite ore for removing magnetic mine is transferred to swaging machine scouring；
Step 3: screening: material is transferred to spin vibration sieve and is screened after scouring；
Step 4: separation: sedimentation obtains diatomite underflow in subsider；
Step 5: paving disk: upper material frame after diatomite underflow is laid in material disc；
Step 6: quick-frozen: will be carried out in material frame push-in quick freezing repository quick-frozen；
Step 7: freeze-drying: being lyophilized in the material push-in vacuum freeze drying cabin after quick-frozen；
Step 8: crushing: the material after freeze-drying being carried out to crush to obtain diatomite dry powder；
It is further comprising the steps of between the step 1 and two:
(1) select: oversize enters conveyer picker, manually sorts out impurity；
(2) it is crushed: selecting rear raw ore and be crushed；
(3) magnetic separation: material and the screenings of step 1 are transferred to magnetic separator and carry out magnetic separation after broken；
Swaging machine described in step 2 is three slot type swaging machines；Spin vibration sieve described in step 3 is the double-deck spin vibration sieve；In step 4
The diatomite underflow concentration is 55%~70%；Step 5 middle berth disc thickness is 4~5cm；In step 6 quick freezing temperature be-
38~-42 DEG C；
The lyophilized technique of vacuum freeze drying cabin described in step 7 is ladder-elevating temperature formula temperature curve.
2. a kind of diatomite dry powder according to claim 1, it is characterised in that: the ladder-elevating temperature formula temperature curve are as follows:
A, room temperature keeps 60~90min, is evacuated within 100Pa；
B, plate temperature is warming up to 40~45 DEG C of 70~90min of holding, vacuum is kept within 100Pa；
C, plate temperature is warming up to 50~55 DEG C of 120~150min of holding, vacuum is kept within 100Pa；
D, plate temperature is warming up to 70~75 DEG C of 80~100min of holding, vacuum is kept within 80Pa；
E, plate temperature is warming up to 80~85 DEG C of 30~50min of holding, vacuum is kept within 40Pa；
F, plate temperature is cooled to 55 DEG C, vacuum is kept within 40Pa, and the mild temperature of charge of plate keeps 30 in two horizontal parallel lines
Vacuum breaker export after~40min.
3. a kind of diatomite dry powder according to claim 2, it is characterised in that: the cold-trap temperature of the vacuum freeze drying cabin
Degree is -38~-42 DEG C；By cooling water forced cooling when step F plate temperature drop temperature.
4. a kind of diatomite dry powder according to claim 2, it is characterised in that: in diatomite underflow described in step 7
Add dispersing agent.
5. a kind of diatomite dry powder according to claim 4, it is characterised in that: the dispersing agent is polyurethane kind, dosage
It is the 0.1%~0.3% of diatomite underflow gross weight.
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| US3572500A (en) * | 1968-06-18 | 1971-03-30 | Cities Service Co | Beneficiation of diatomaceous earth |
| CN101497444B (en) * | 2009-03-04 | 2012-07-18 | 中国科学院广州能源研究所 | Method for preparing nano polyporous material with large specific surface area by vacuum freeze-drying process |
| CN102921532B (en) * | 2011-08-09 | 2014-03-26 | 中国矿业大学(北京) | Laminar centrifugal beneficiation method for diatomite ores |
| CN102432327A (en) * | 2011-09-07 | 2012-05-02 | 陕西理工学院 | Method for preparing aluminum oxide porous ceramic with composite structure by adopting freeze drying process |
| CN102744145A (en) * | 2012-06-18 | 2012-10-24 | 中国矿业大学(北京) | Scrubbing process for diatomaceous earth ores |
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