CN108083312B - A kind of carbonization reactor and preparation small particle, polymolecularity, low oil factor nanometer calcium carbonate method - Google Patents
A kind of carbonization reactor and preparation small particle, polymolecularity, low oil factor nanometer calcium carbonate method Download PDFInfo
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Abstract
The invention discloses a kind of carbonization reactor and the methods for preparing small particle, polymolecularity, low oil factor nanometer calcium carbonate, are related to nanometer calcium carbonate technical field；The carbonization reactor includes liquid film nucleation device and crystal grower；Liquid film, which is nucleated in device, is equipped with gas distributor, and blender is equipped in crystal grower；The method that small particle, polymolecularity, low oil factor nanometer calcium carbonate are prepared using the carbonization reactor, including lime is calcined, is digested, is filtered, is cooled down, once the processes such as carbonization, ageing, secondary carbonization, surface treatment, filter-press dehydration, drying, crushing to get arrive product of the invention；Nanometer calcium carbonate produced by the present invention is cube, and primary particle size is 20~30nm, is tested through Malvern laser particle analyzer, and nanometer calcium carbonate produced by the present invention is Unimodal Distribution, and average grain diameter 220nm, oil factor is less than 18mlDOP/100gCaCO3, have the advantages that small partial size, good dispersion, oil factor are low, production cost is low and quality is stable.
Description
Technical field
The present invention relates to nanometer calcium carbonate technical field more particularly to a kind of carbonization reactor and use the reactor system
Standby small particle, polymolecularity, low oil factor nanometer calcium carbonate method.
Background technique
Currently, about Nano-meter CaCO33Preparation method have very much, calcium carbonate preparation method is divided into liquid phase reactor method and carbonization
Method.Liquid phase reactor method is to prepare calcium carbonate, gained by reaction between two kinds of solution of calcium salt and polcarb or bicarbonate
The most of patterns of product are relatively regular and particle size is micron order, and the reaction volume used due to it is few and preparation process is difficult
With the limitation of control, it is difficult to application of being magnified.Carbonizatin method is the main method of current industrial production nanometer calcium carbonate, should
Method raw material sources are extensive, and primary raw material is by selected lime stone.Lime stone obtains CaO by calcining；Then by CaO digestion
It is passed through CO2, chemical additives are added, carbonization is to terminal；Final product was waited by surface treatment, dehydration, drying, crushing and classification
Journey obtains nano-calcium carbonate calcium product.According to CO2With Ca (OH)2Carbonizatin method can be divided into interval by the difference of the suspension way of contact
Carbonizatin method, multilevel spray carbonization and high-gravity carbonation method.
Existing interval bubbling type carbonizatin method synthesis nanometer calcium carbonate is to be provided with the calcium hydroxide of purification in carbonization kettle
Slurry, kiln gas enter from carbonization kettle bottom, and gas-liquid mixed is made to generate nanometer calcium carbonate under mechanical stirring.This synthesis nano-sized carbon
The method of sour calcium is that the formation of calcium carbonate nucleus is carried out continuously with being grown in same system.Since the formation of nucleus does not have with growth
There is stringent differentiation, the long calcium carbonate growth period being then nucleated in the calcium carbonate growth period being first nucleated is short, causes granular size different, no
With size particles in same system, causes surface energy differential between particle not big, be easy to cause agglomeration.
Also have in the prior art by the nucleation of nanometer calcium carbonate and grow what substep carried out, such as Chinese patent
CN103011226B discloses the preparation method of a kind of nucleation and the nanometer calcium carbonate for growing substep progress, and this method is by kiln gas
After spraying and dedusting, foam dust-removing, is compressed and be cooled to 30 DEG C hereinafter, calcium hydroxide slurry is imported in mixing chamber, by leading
Tracheae sucks a large amount of kiln gas, and reaction forms calcium carbonate nucleus；The slurry for having formed calcium carbonate nucleus gap bubbling is sent into again to stir
It mixes in formula carbonization kettle, is passed through kiln gas under stiring and continues carburizing reagent, when the pH value of reaction solution is less than 7, be as carbonized terminal, kiln
The volumetric concentration of carbon dioxide gas is 25.0-35.0% in gas.Although the patent divides the nucleation of nanometer calcium carbonate and growth
Step carries out, but lower at gas concentration lwevel in the kiln gas in nuclear reaction, and carbon dioxide contacts not with calcium hydroxide slurry
Sufficiently, reaction is caused to be not thorough, therefore nanometer calcium carbonate nucleus nucleation quantity is few and uneven.
In addition, the technology relative maturity for using carbonizatin method to prepare partial size as the cubic calcium carbonate of 60~100nm, but it is right
In preparing partial size in 60nm calcium carbonate below, since calcium carbonate partial size is small, secondary agglomeration is serious, and dispersibility is difficult to control, and makes
Higher at its oil factor, especially when preparing the nanometer calcium carbonate that partial size is 30~40nm, dispersibility is the pass of technology of preparing
Key.
The present inventor is found through experiments that, influences the granular size because being known as nanometer calcium carbonate of nanometer calcium carbonate oil factor
And dispersibility, wherein dispersibility is to influence the principal element of oil factor size.Nanometer calcium carbonate partial size is bigger, and specific surface area is got over
Small, then oil factor is lower；Nanometer calcium carbonate dispersibility is better, and particle agglomeration is fewer, then oil factor is lower.The prior art
In, it is next often by the biggish Nano particles of calcium carbonate of partial size is prepared in order to obtain the nano-calcium carbonate calcium product of low oil factor
It realizes, without solving the problems, such as that small particle nanometer calcium carbonate oil factor is high, also without solving the dispersion of small particle nanometer calcium carbonate
The problem of property, so affecting the application range of small particle nanometer calcium carbonate.
Summary of the invention
The shortcomings that overcoming the above prior art: the technical problem to be solved by the present invention is to provide a kind of carbonization reactor
And the method for using carbonization reactor preparation small particle, polymolecularity, low oil factor nanometer calcium carbonate, to solve small particle
Nanometer calcium carbonate bad dispersibility and the high problem of oil factor.
Technical solution of the invention is as follows:
A kind of carbonization reactor, including liquid film nucleation device and crystal grower, the upper end of the liquid film nucleation device be equipped with into
Mouth one and grout outlet one are starched, lower end is equipped with gas access one, and stock inlet one and grout outlet one are located at the two of liquid film nucleation device
End, liquid film are nucleated in device and are additionally provided with gas distributor；The upper end of crystal grower is equipped with stock inlet two, and lower end is equipped with gas access
Two and grout outlet two, blender is additionally provided in crystal grower, and crystal grower is externally provided with the motor connecting with blender, described
Grout outlet one and stock inlet two be connected to by pump.
Preferably, being equipped at the stock inlet one, stock inlet two, gas access one and gas access two for controlling
The flow control valve of slurry and gas intake.
The method that small particle, polymolecularity, low oil factor nanometer calcium carbonate are prepared using above-mentioned carbonization reactor, including with
Lower step:
One, lime is calcined, keeps raw burn, the whiteness of the lime of firing is 95% or more；
Two, lime particle of the whiteness 95% or more is selected by color selector, carries out digestion reaction with water and obtains hydroxide
Calcium is slightly starched, and hydrogen calcium hydroxide is slightly starched to the sieve for successively passing through 100 mesh, 200 mesh, 325 mesh, 500 mesh, obtains calcium hydroxide essence
Slurry；
Three, adding water to be modulated into mass percent concentration calcium hydroxide refining is 6~8%, and being cooled to temperature is 7~10
℃；
Four, the calcium hydroxide refining that step 3 obtains is passed through in liquid film nucleation device from stock inlet one, from gas access one
It is passed through pure CO2Crystal growth controlling agent is added into liquid film nucleation device in gas, pure CO2Gas is nucleated device in liquid film by setting
Gas distributor and calcium hydroxide refining come into full contact with carry out carburizing reagent, it is then old when carbonization to slurry pH value is 9~11
Change 8~12 hours；
Five, the ripe slurry of the calcium carbonate after ageing is pumped into crystal grower from stock inlet two, under stiring from gas access
Two are passed through the CO that volumetric concentration is 55~65%2Crystal growth controlling agent is added into crystal grower in gas, carries out secondary
Carburizing reagent, reacting to the pH value of the ripe slurry of calcium carbonate is 7~9, as carbonization terminal；
Six, the ripe slurry of the calcium carbonate obtained step 5 is added in wet method fine grinding or grinding machine for cutting charge into pieces, adds zirconium oxide
Ball, alumina balls after grinding 20~40min, are added surfactant, continue 20~40min of grinding as abrasive media；
Seven, the calcium carbonate obtained step 6 carries out filter-press dehydration, drying, crushing, classification to get to small particle, high score
Dissipate property, the nanometer calcium carbonate of low oil factor.
Preferably, calcium hydroxide refining is carried out by plate heat exchanger and 7 DEG C of cooling waters below in the step 3
Heat exchange, makes the temperature of calcium hydroxide refining be reduced to 7~10 DEG C.
Preferably, the temperature reacted in liquid film nucleation device is 15~25 DEG C in the step 4.
Preferably, crystal growth controlling agent is NaCO in the step 43。
Preferably, crystal growth controlling agent is one of sucrose, beet sugar, maltose or one in the step 5
Kind or more mixture.
Preferably, in the step 5, CO that volumetric concentration is 55~65%2Gas the preparation method comprises the following steps: by lime
The kiln gas that kiln generates is dusted processing by pulse dust collector and water dust scrubber, is then compressed to kiln gas through water ring compressor
In storage tank, with the pure CO for being stored in pressurized reservoir2Gas carries out distribution to get the CO for being 55~65% to volumetric concentration2Gas.
Preferably, in the step 6, diameter is 0.5~1.5nm and diameter is 1.5~2nm zirconia ball and oxygen
The mass ratio for changing aluminium ball is 3:1~6.
Preferably, surfactant is complexed surfactant in the step 6, by ionic surfactant,
Sodium Polyacrylate, odium stearate composition.
Preferably, the primary particle size of nanometer calcium carbonate obtained is 20~30nm in the step 7.
The beneficial effects of the present invention are:
1, the present invention carries out the nucleation of nanometer calcium carbonate and growth substep, carries out nanometer calcium carbonate in liquid film nucleation device
Nucleation, in crystal grower carry out nucleus growth.Gas distributor is set in liquid film nucleation device first, and makes dioxy
Change tower gas to contact in opposite directions with slurry, ensure that solution-air contact is good, to ensure that calcium hydroxide refining obtains in carbonators
To abundant reaction, in favor of the generation of nucleus, make to be formed that nanometer calcium carbonate nucleus is uniform and stable, and Nano particles of calcium carbonate partial size exists
It is controllable between 20~30nm.Secondly, carrying out the nucleation of nanometer calcium carbonate and the stringent differentiation of growth and under different conditions, keep away
It is different with growth period length to have exempted from nanometer calcium carbonate nucleation, has caused particle diameter distribution wide, bad dispersibility, serious weakness of reuniting, from
And the nanometer calcium carbonate of the cubic type of small particle is made, it ensure that the dispersibility of nanometer calcium carbonate.Finally, nucleation of the invention
Density of carbon dioxide gas in reaction is 100%, ensure that the concentration of reactant, sufficiently carries out to make into nuclear reaction, is protected
Demonstrate,prove crystal nucleation quantity；In addition in crystal growth phase, secondary carbonization is carried out using with the mixed carbon dioxide gas of kiln gas,
It not only ensure that the growth of nucleus, but also reused this by-product of kiln gas, it is energy saving.
2, the present invention is aged after primary carbonization, makes nanometer calcium carbonate regular appearance, so that dispersibility is better.Simultaneously
Nanometer calcium carbonate surface is modified simultaneously using compound base amount method agent and grinding, by being handled with surface treating agent, can
Nano particles of calcium carbonate surface charge is adjusted, guarantees that partial size is appropriate, is allowed to evenly dispersed not conglomeration.Using wet method fine grinding or grind
Mill machine for cutting charge into pieces is ground, and is played the role of reuniting nano-calcium carbonate particles and be broken up, to further reduce nano-calcium carbonate
Calcium agglomeration.
3, compared with prior art, nanometer calcium carbonate produced by the present invention is cube, and primary particle size is 20~30nm, warp
The test of Malvern laser particle analyzer, nanometer calcium carbonate produced by the present invention are Unimodal Distribution, average grain diameter 220nm, oil factor
Less than 18mlDOP/100gCaCO3, it is excellent to have that partial size is small, good dispersion, oil factor is low, production cost is low and quality is stable
Point.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of carbonization reactor of the present invention；
As shown in the figure: 1, liquid film is nucleated device；11, stock inlet one；12, gas access one；13, gas distributor；14, pulp
Mouth one；2, crystal grower；21, stock inlet two；22, gas access two；23, grout outlet two；24, blender；25, motor；3,
Pump；
Fig. 2 is the scanning electron microscopic picture of nano-calcium carbonate particles made from embodiment one；
Fig. 3 (a) is the particle size distribution figure of nano-calcium carbonate particles made from embodiment one；
Fig. 3 (b) is the particle size distribution figure of nano-calcium carbonate particles made from embodiment two；
Fig. 4 is the multiple spot BET curve graph of nano-calcium carbonate particles made from embodiment one.
Specific embodiment
The present invention is described in further details with specific embodiment below, but the present invention is not only limited in detail below in fact
Apply example.
Embodiment one
Carbonization reactor of the invention as shown in Figure 1 comprising liquid film is nucleated device 1 and crystal grower 2, the liquid film at
The upper end of core device 1 is equipped with stock inlet 1 and grout outlet 1, and lower end is equipped with gas access 1, stock inlet 1 and grout outlet
One 14 are located at the two sides of liquid film nucleation device 1, are additionally provided with gas distributor 13 in liquid film nucleation device 1；The crystal grower 2
Upper end be equipped with stock inlet 2 21, lower end is equipped with gas access 2 22 and grout outlet 2 23, is additionally provided with stirring in crystal grower 2
Device 24, crystal grower 2 are externally provided with the motor 25 connecting with blender 24, and the grout outlet 1 and stock inlet 2 21 pass through
Pump 3 is connected to, and it is gentle for controlling slurry to be equipped at the stock inlet one, stock inlet two, gas access one and gas access two
The flow control valve (not indicating in Fig. 1) of body intake, liquid film is nucleated device 1 and crystal grower 2 passes through support column (in Fig. 1 not
Mark) it fixes on the ground.
The preparation method of small particle, polymolecularity, low oil factor nanometer calcium carbonate is prepared using the carbonization reactor, including
Following steps:
One, lime is calcined, lime will wilfully be burnt in calcination process, so that the whiteness for the lime fired is 95%
More than；
Two, the lime particle that whiteness is 95% or more is selected by color selector to be added in digestion machine, water is added digest instead
It answers, obtains calcium hydroxide and slightly starch, hydrogen calcium hydroxide is slightly starched to the sieve for successively passing through 100 mesh, 200 mesh, 325 mesh, 500 mesh, is obtained
To calcium hydroxide refining；
Three, adding water to be modulated into mass percent concentration calcium hydroxide refining is 6%, through plate heat exchanger and 7 DEG C or less
Cooling water exchange heat, make calcium hydroxide purification slurries temperature be reduced to 7 DEG C；
Four, the kiln gas that limekiln generates is dusted processing by pulse dust collector and water dust scrubber, then through water
Ring compressor compresses are into kiln gas storage tank, with the pure CO for being stored in pressurized reservoir2Gas carries out distribution, and obtaining volumetric concentration is
55% CO2Gas；
Five, the calcium hydroxide refining that step 3 obtains is passed through in liquid film nucleation device from stock inlet one, from gas access one
It is passed through pure CO2Crystal growth controlling agent is added into liquid film nucleation device in gas, pure CO2Gas is nucleated device in liquid film by setting
Gas distributor and calcium hydroxide refining come into full contact with carry out carburizing reagent, the temperature of reaction is 15 DEG C, obtains CaCO3Nucleus
Liquid；
Six, wait be carbonized to CaCO3When the pH of nucleus liquid is 9, by CaCO3Nucleus liquid is passed through in aging tank and is aged 8 hours；
Seven, by the CaCO after ageing3Nucleus liquid is pumped into crystal grower from stock inlet two, under stiring from gas access
Two are passed through the CO that volumetric concentration is 55%2Crystal growth controlling agent is added into crystal grower in gas, carries out secondary carbonization
Reaction, reacting to the pH value of the ripe slurry of calcium carbonate is 7, as carbonization terminal；
Eight, by CaCO3Ripe slurry is added in wet method fine grinding, and zirconia ball, alumina balls are added as abrasive media, diameter
Mass ratio for 0.5~1.5nm zirconia ball and alumina balls for being 1.5~2nm with diameter is 3:1, after grinding 20min, is added
Enter polyacrylic acid natrium surfactant, continues to grind 20min；
Nine, through filter-press dehydration, band drier is dry, the classification of grinding machine powder grader, packs to get to polymolecularity, low
The nanometer calcium carbonate of oil factor.
By nanometer calcium carbonate made from embodiment one carry out electron-microscope scanning, grain size analysis, specific surface area and oil factor into
Row test, test result is as follows:
1, nanometer calcium carbonate is scanned using electron microscope, obtains electron-microscope scanning figure, as shown in Fig. 2.
2, the testing to nano-calcium carbonate particles using Malvern laser particle analyzer, obtains particle size distribution figure, such as attached
It is Unimodal Distribution, average grain diameter 227.3nm shown in Fig. 3 (a).
3, the specific surface area of nanometer calcium carbonate is tested using V-Sorb 2800P specific surface area and Porosimetry,
BET absorption test chart is obtained, as shown in Fig. 4, obtaining its specific surface area is 42.230620m2/g。
4, calculated according to standard GB/T/T19590-2004 method, measuring its oil factor is 17.2mlDOP/
100gCaCO3。
Embodiment two
The preparation method of small particle, polymolecularity, low oil factor nanometer calcium carbonate is prepared using the carbonization reactor, including
Following steps:
One, lime is calcined, lime will wilfully be burnt in calcination process, so that the whiteness for the lime fired is 95%
More than；
Two, the lime particle that whiteness is 95% or more is selected by color selector to be added in digestion machine, water is added digest instead
It answers, obtains calcium hydroxide and slightly starch, hydrogen calcium hydroxide is slightly starched to the sieve for successively passing through 100 mesh, 200 mesh, 325 mesh, 500 mesh, is obtained
To calcium hydroxide refining；
Three, adding water to be modulated into mass percent concentration calcium hydroxide refining is 7%, through plate heat exchanger and 7 DEG C or less
Cooling water exchange heat, make calcium hydroxide purification slurries temperature be reduced to 8 DEG C；
Four, the kiln gas that limekiln generates is dusted processing by pulse dust collector and water dust scrubber, then through water
Ring compressor compresses are into kiln gas storage tank, with the pure CO for being stored in pressurized reservoir2Gas carries out distribution, and obtaining volumetric concentration is
60% CO2Gas；
Five, the calcium hydroxide refining that step 3 obtains is passed through in liquid film nucleation device from stock inlet one, from gas access one
It is passed through pure CO2Crystal growth controlling agent is added into liquid film nucleation device in gas, pure CO2Gas is nucleated device in liquid film by setting
Gas distributor and calcium hydroxide refining come into full contact with carry out carburizing reagent, the temperature of reaction is 20 DEG C, obtains CaCO3Nucleus
Liquid；
Six, wait be carbonized to CaCO3When the pH of nucleus liquid is 10, by CaCO3Nucleus liquid is passed through in aging tank and is aged 10 hours；
Seven, by the CaCO after ageing3Nucleus liquid is pumped into crystal grower from stock inlet two, under stiring from gas access
Two are passed through the CO that volumetric concentration is 60%2Crystal growth controlling agent is added into crystal grower in gas, carries out secondary carbonization
Reaction, reacting to the pH value of the ripe slurry of calcium carbonate is 8, as carbonization terminal；
Eight, by CaCO3Ripe slurry is added in wet method fine grinding, and zirconia ball, alumina balls are added as abrasive media, diameter
Mass ratio for 0.5~1.5nm zirconia ball and alumina balls for being 1.5~2nm with diameter is 1:1, after grinding 30min, is added
Enter odium stearate surfactant, continues to grind 30min；
Nine, through filter-press dehydration, band drier is dry, the classification of grinding machine powder grader, packs to get to polymolecularity, low
The nanometer calcium carbonate of oil factor.
Nanometer calcium carbonate obtained is tested according to the method for embodiment one, test result is as follows:
1, attached drawing 3 (b) is the particle size distribution figure of embodiment two, is Unimodal Distribution, average grain diameter 223.3nm.
2, the specific surface area of nanometer calcium carbonate is 43.15320m2/g。
3, the oil factor of nanometer calcium carbonate is 16.1mlDOP/100gCaCO3。
Embodiment three
The preparation method of small particle, polymolecularity, low oil factor nanometer calcium carbonate is prepared using the carbonization reactor, including
Following steps:
One, lime is calcined, lime will wilfully be burnt in calcination process, so that the whiteness for the lime fired is 95%
More than；
Two, the lime particle that whiteness is 95% or more is selected by color selector to be added in digestion machine, water is added digest instead
It answers, obtains calcium hydroxide and slightly starch, hydrogen calcium hydroxide is slightly starched to the sieve for successively passing through 100 mesh, 200 mesh, 325 mesh, 500 mesh, is obtained
To calcium hydroxide refining；
Three, adding water to be modulated into mass percent concentration calcium hydroxide refining is 8%, through plate heat exchanger and 7 DEG C or less
Cooling water exchange heat, make calcium hydroxide purification slurries temperature be reduced to 10 DEG C；
Four, the kiln gas that limekiln generates is dusted processing by pulse dust collector and water dust scrubber, then through water
Ring compressor compresses are into kiln gas storage tank, with the pure CO for being stored in pressurized reservoir2Gas carries out distribution, and obtaining volumetric concentration is
65% CO2Gas；
Five, the calcium hydroxide refining that step 3 obtains is passed through in liquid film nucleation device from stock inlet one, from gas access one
It is passed through pure CO2Crystal growth controlling agent is added into liquid film nucleation device in gas, pure CO2Gas is nucleated device in liquid film by setting
Gas distributor and calcium hydroxide refining come into full contact with carry out carburizing reagent, the temperature of reaction is 25 DEG C, obtains CaCO3Nucleus
Liquid；
Six, wait be carbonized to CaCO3When the pH of nucleus liquid is 11, by CaCO3Nucleus liquid is passed through in aging tank and is aged 12 hours；
Seven, by the CaCO after ageing3Nucleus liquid is pumped into crystal grower from stock inlet two, under stiring from gas access
Two are passed through the CO that volumetric concentration is 65%2Crystal growth controlling agent is added into crystal grower in gas, carries out secondary carbonization
Reaction, reacting to the pH value of the ripe slurry of calcium carbonate is 9, as carbonization terminal；
Eight, by CaCO3Ripe slurry is added in wet method fine grinding, and zirconia ball, alumina balls are added as abrasive media, diameter
Mass ratio for 0.5~1.5nm zirconia ball and alumina balls for being 1.5~2nm with diameter is 1:2, after grinding 40min, is added
Enter polyacrylic acid natrium surfactant, continues to grind 40min；
Nine, through filter-press dehydration, band drier is dry, the classification of grinding machine powder grader, packs to get to polymolecularity, low
The nanometer calcium carbonate of oil factor.
Nanometer calcium carbonate obtained is tested according to the method for embodiment one, test result is as follows:
1, nanometer calcium carbonate is in Unimodal Distribution, average grain diameter 228.4nm.
2, the specific surface area of nanometer calcium carbonate is 42.52170m2/g。
3, the oil factor of nanometer calcium carbonate is 16.7mlDOP/100gCaCO3。
The above is only feature implementation examples of the invention, are not limited in any way to the scope of the present invention.It is all to use together
The technical solution formed Deng exchange or equivalence replacement, all falls within rights protection scope of the present invention.
Claims (6)
1. a kind of method for preparing polymolecularity, low oil factor nanometer calcium carbonate using carbonization reactor, it is characterised in that: including
Following steps:
Step 1: lime is calcined, raw burn is kept, the whiteness of the lime of firing is 95% or more；
Step 2: selecting lime particle of the whiteness 95% or more by color selector, digestion reaction is carried out with water and obtains hydroxide
Calcium is slightly starched, and calcium hydroxide is slightly starched to the sieve for successively passing through 100 mesh, 200 mesh, 325 mesh, 500 mesh, obtains calcium hydroxide refining；
Step 3: adding water to be modulated into mass percent concentration calcium hydroxide refining is 6~8%, being cooled to temperature is 7~10
℃；
Step 4: the calcium hydroxide refining that step 3 obtains is passed through in liquid film nucleation device from stock inlet one, from gas access one
It is passed through pure CO2Crystal growth controlling agent is added into liquid film nucleation device in gas, pure CO2Gas is nucleated device in liquid film by setting
Gas distributor and calcium hydroxide refining come into full contact with carry out carburizing reagent, it is then old when carbonization to slurry pH value is 9~11
Change 8~12 hours；Crystal growth controlling agent described in this step is Na2CO3；
Step 5: the ripe slurry of the calcium carbonate after ageing is pumped into crystal grower from stock inlet two, under stiring from gas access
Two are passed through the CO that volumetric concentration is 55~65%2Crystal growth controlling agent is added into crystal grower in gas, carries out secondary
Carburizing reagent, reacting to the pH value of the ripe slurry of calcium carbonate is 7~9, as carbonization terminal；Crystal growth controlling agent described in this step
For one of sucrose, beet sugar, maltose or more than one mixture；
Step 6: the ripe slurry of the calcium carbonate that step 5 is obtained is added in wet method fine grinding or grinding machine for cutting charge into pieces, zirconium oxide is added
Ball, alumina balls after grinding 20~40min, are added surfactant, continue 20~40min of grinding as abrasive media；
Step 7: the calcium carbonate that step 6 is obtained carries out filter-press dehydration, drying, crushing, classification to get to small particle, high score
Dissipate property, the nanometer calcium carbonate of low oil factor；
The surfactant is complexed surfactant, by ionic surfactant, Sodium Polyacrylate, odium stearate group
At；
The carbonization reactor comprising liquid film is nucleated device (1) and crystal grower (2), and the liquid film is nucleated the upper of device (1)
End is equipped with stock inlet one (11) and grout outlet one (14), and lower end is equipped with gas access one (12), stock inlet one (11) and grout outlet
One (14) are located at the two sides of liquid film nucleation device (1), are additionally provided with gas distributor (13) in liquid film nucleation device (1)；The crystalline substance
The upper end of body grower (2) is equipped with stock inlet two (21), and lower end is equipped with gas access two (22) and grout outlet two (23), crystal
It is additionally provided with blender (24) in grower (2), crystal grower (2) is externally provided with the motor (25) connecting with blender (24), institute
The grout outlet one (14) stated is connected to stock inlet two (21) by pumping (3).
2. the method according to claim 1 that polymolecularity, low oil factor nanometer calcium carbonate are prepared using carbonization reactor,
It is characterized by: calcium hydroxide refining is exchanged heat by plate heat exchanger and 7 DEG C of cooling waters below in the step 3,
The temperature of calcium hydroxide refining is set to be reduced to 7~10 DEG C.
3. the method according to claim 1 that polymolecularity, low oil factor nanometer calcium carbonate are prepared using carbonization reactor,
It is characterized by: the temperature reacted in liquid film nucleation device is 15~25 DEG C in the step 4.
4. the method according to claim 1 that polymolecularity, low oil factor nanometer calcium carbonate are prepared using carbonization reactor,
It is characterized by: in the step 5, CO that volumetric concentration is 55~65%2Gas the preparation method comprises the following steps: limekiln is generated
Kiln gas be dusted processing by pulse dust collector and water dust scrubber, be then compressed to kiln gas storage tank through water ring compressor
In, with the pure CO for being stored in pressurized reservoir2Gas carries out distribution to get the CO for being 55~65% to volumetric concentration2Gas.
5. the method according to claim 1 that polymolecularity, low oil factor nanometer calcium carbonate are prepared using carbonization reactor,
It is characterized by: in the step 6, diameter is 0.5~1.5nm and diameter is 1.5~2nm zirconia ball and alumina balls
Mass ratio be 3:1~6.
6. the method according to claim 1 that polymolecularity, low oil factor nanometer calcium carbonate are prepared using carbonization reactor,
It is characterized by: the primary particle size of nanometer calcium carbonate obtained is 20~30nm in the step 7.
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