CN107445188A - A kind of preparation method of rod-like precipitates calcium carbonate - Google Patents
A kind of preparation method of rod-like precipitates calcium carbonate Download PDFInfo
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- CN107445188A CN107445188A CN201710842190.5A CN201710842190A CN107445188A CN 107445188 A CN107445188 A CN 107445188A CN 201710842190 A CN201710842190 A CN 201710842190A CN 107445188 A CN107445188 A CN 107445188A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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Abstract
The invention discloses a kind of preparation method of rod-like precipitates calcium carbonate, comprise the following steps：(1) lime white is prepared；(2) carbonation reaction：Lime white is inserted in carbonation reaction tower, opens stirring, it is 40 80 DEG C to control temperature of reaction system, and the concentration that carbon dioxide in gas mixture is passed through in reaction 30min early stage 0 is 5 15vol%, and flow is 2 4m3/ h, the concentration that carbon dioxide in gas mixture is passed through in the carbonation reaction later stage are 25 40vol%, and flow is 4 6m3/ h, stop ventilation when pH value of reaction system reaches 7.5, terminate carbonation reaction, obtain winnofil suspension；(3) dehydrate：By winnofil suspension through dehydration, rod-like precipitates calcium carbonate is dried to obtain.Preparation method of the present invention, chemical additives and/or crystal seed need not be added in preparation process, rod-like precipitates calcium carbonate can be prepared by the control of technique, solve the problems, such as to use cost height and poor product quality caused by chemical additives, the problems such as crystal seed is prepared difficult in crystal seed method, and technological process is long.
Description
Technical field
The invention belongs to technical field of inorganic material, is related to winnofil, more precisely, is related to using lime stone as original
The preparation method of the rod-like precipitates calcium carbonate of material.
Background technology
Calcium carbonate is a kind of important inorganic filler, is widely used in the fields such as plastics, rubber, papermaking and coating.According to
The difference of calcium carbonate production method, calcium carbonate can be divided into powdered whiting and winnofil.Powdered whiting is through machinery
Method directly crush natural marble or lime stone is made.Winnofil is crystallized through chemical precipitation and prepared.According to difference
Reaction condition, the winnofils of different morphologies can be obtained, such as rice-shaped, fusiform, class be cubic, chain, sheet, spherical
With it is bar-shaped etc..The crystalline phase of calcium carbonate has three kinds：Calcite, aragonite and vaterite.Rod-like precipitates calcium carbonate is generally aragonite crystalline phase.
Because grain aspect is bigger, rod-like precipitates carbon calcium has some special application performances.Relative to application the most
Extensive spindle winnofil, when rod-like precipitates calcium carbonate is used as filler, there is higher retention, improve paper
Bulk and printing adaptability.Because rod-like precipitates calcium carbonate is easy to produce bridging effect, filling paper strength drop with paper-making fibre
Low rate is smaller.Rod-like precipitates calcium carbonate (aragonite structure) has higher index of refraction than other calcite calcium carbonates, as papermaking
The higher hiding rare of paper and printing colour developing optical density can be assigned during coating.Bar-shaped calcium carbonate applies also for filling plastic, with
Other calcium carbonate of similar specific surface are compared, and rod-like precipitates calcium carbonate can assign the more preferable processing fluidity of product, thermostabilization
Property, lustrous surface, stretching/modulus of elasticity in static bending and impact strength.
During as coating for paper, rod-like precipitates calcium carbonate can form uniform space in coating, accelerate the ink of paper
Infiltration rate, be advantageous to high speed printing, can also improve paper sheet thickness and glossiness, be expected to the kaolin for substituting price higher.Specially
Sharp CN 105484099A disclose a kind of aragonitic fine particle calcium carbonate composition and its application process for coating for paper, preferred particle
Size distribution is 0.5~2.3um, the aragonitic fine particle calcium carbonate of draw ratio 8~13, alternative or reduce kaolin in paper, is improved
Art paper and art post paperboard surface strength and glossiness, coating for paper cost is reduced in the case where not influenceing paper quality.Specially
Sharp WO 2009/009553A1 disclose a kind of aragonitic winnofil for Paper Coating material, and aragonite content is not less than
30%, and calcium carbonate content of the particle diameter more than or equal to 2um is less than 4%, the calcium carbonate content less than or equal to 0.25um is less than 10%,
The transparency of paper is effectively improved for Paper Coating, gloss, prints gloss and brightness.
Carbonation method is most important and most ripe winnofil industrial process, i.e., in lime white (calcium hydroxide
Slurry) in be passed through carbon dioxide containing gas carry out precipitated crystal reaction.Rod-like precipitates calcium carbonate is prepared using carbonation method, generally
Need to add chemical additives and/or crystal seed in crystallization reaction mixture.Chemical additives mainly based on inorganic compound,
Include magnesium, strontium compound and phosphoric acid/salt etc. using more.
Carbonation method prepares bar-shaped (aragonitic) winnofil, and magnesium chloride is effective chemical additives, and magnesium salts valency
Lattice are relatively low.But the problem of generally existing magnesium chloride dosage is excessive when making chemical additives with magnesium chloride, is difficult to remove in the product
As impurity.If making chemical additives with acicular magnesium hydroxide and magnesium carbonate, chemical additives are difficult to obtain in itself.
The conventional chemical additives of bar-shaped (aragonitic) winnofil are prepared containing strontium compound and carbonation method, often
It can obtain high aragonite content product.But the mechanism of action of chemical additives containing strontium compound is complicated, to carbonation reaction process conditions
It is required that it is high, different carbonating technique is needed containing strontium compound using different.Price containing strontium compound is higher, is examined for cost
Consider, generally prepare high aragonite content winnofil to make chemical additives containing strontium compound, then crystal seed batch is made with this and prepared
Rod-like precipitates calcium carbonate.
Phosphoric acid/salt is also that carbonation method prepares the conventional chemical additives of rod-like precipitates calcium carbonate.It is other to be used to be carbonated
The single crystal form controlling agent that method prepares bar-shaped calcium carbonate also has aluminum contained compound.Most of additives are difficult to graining when being used alone
The effect of type control, or effect are poor, therefore it is conventional method to be used in combination using two or more chemical additives.
In addition to using chemical additives, carbonation method prepares rod-like precipitates calcium carbonate and also often adds crystal seed, i.e., carbonating is anti-
Should before a certain amount of aragonitic/bar-shaped material is introduced in lime white make crystal seed and prepare bar-shaped calcium carbonate.Using addition crystal seed
Method prepares rod-like precipitates calcium carbonate, can effectively improve bar-shaped calcium carbonate content in product, controls its crystal habit, while can solve
Certainly use Cost Problems caused by more chemical additives, but crystal habit or aragonite content requirement height to crystal seed.Final production
Aragonite phase/bar-shaped calcium carbonate content in thing is often below crystal seed.
In addition to using chemical additives and crystal seed, carbonating technique is also that carbonation method prepares the research of rod-like precipitates calcium carbonate
Emphasis, such as lime slaking temperature, lime slaking ash/water ratio, lime white solid content, carbonation reaction initial temperature, reacting gas
Gas concentration lwevel etc..Research to the process conditions that are carbonated in the past is on the basis of addition chemical additives or crystal seed mostly
Carry out.So far, any additive or crystal seed are not used, and only by adjustment, preparation technology prepares rod-like precipitates calcium carbonate
Method there is not been reported.Almost all of correlative study person not think to add chemical additives/crystal seed be difficult to prepare it is bar-shaped
Winnofil.
Generally speaking, rod-like precipitates calcium carbonate can be prepared by adding the method for chemical additives/crystal seed.But just industry is raw
For production, the dosage of chemical additives is excessive or selling at exorbitant prices can all cause product cost to rise, and high aragonite content carbonic acid
The preparation of calcium crystal seed is also not easy very much.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
It is an object of the invention to provide a kind of preparation method of rod-like precipitates calcium carbonate, aragonite crystalline phase is prepared so as to overcome
Calcium carbonate needs to add the shortcomings that chemical additives and/or crystal seed, energy consumption are big, cost is high.
To achieve the above object, the invention provides a kind of preparation method of rod-like precipitates calcium carbonate, comprise the following steps：
(1) digestion of limestone calcination and quick lime：Lime white is prepared；
(2) carbonation reaction：The lime white of the step (1) is inserted in carbonation reaction tower, opens stirring, control is anti-
It is 40-80 DEG C to answer system temperature, and the concentration that carbon dioxide in gas mixture is passed through in reaction 0-30min early stage is 5-15vol%,
Flow is 2-4m3/ h, the concentration that carbon dioxide in gas mixture is passed through in the carbonation reaction later stage is 25-40vol%, and flow is
4-6m3/ h, stop ventilation when pH value of reaction system reaches 7.5, terminate carbonation reaction, obtain winnofil suspension；
(3) dehydrate：The step (2) is obtained into winnofil suspension through dehydration, is dried to obtain rod-like precipitates
Calcium carbonate.
Preferably, in above-mentioned technical proposal, quick lime is obtained after lime stone is calcined in the step (1), by life
Lime and water are 1 in mass ratio:4-10 is mixed and fully digestion obtains lime white, lime white sieving, and is adjusted lime white and contained admittedly
Measure to 10-20%.
Preferably, in above-mentioned technical proposal, the coolant-temperature gage of the digestion is 20-30 DEG C.
Preferably, in above-mentioned technical proposal, the lime white sieving was 80 mesh sieves.
Preferably, in above-mentioned technical proposal, before being calcined to lime stone, by limestone crushing to lumpiness 2-3cm.
Preferably, in above-mentioned technical proposal, the limestone calcination is in 1000-1450 DEG C of temperature lower calcination 200-
400min obtains quick lime.
Preferably, in above-mentioned technical proposal, the limestone calcination is in 1100-1300 DEG C of temperature lower calcination 300-
400min obtains quick lime.
Preferably, in above-mentioned technical proposal, the mixing speed of carbonation reaction early stage is 100- in the step (2)
300r/min。
Preferably, in above-mentioned technical proposal, the mixing speed of carbonation reaction middle and later periods is 300- in the step (2)
600r/min。
Preferably, in above-mentioned technical proposal, dehydrating to be 100-120 DEG C of condition in temperature in the step (3)
Lower dry 3-7h.
Compared with prior art, the present invention has the advantages that：The preparation method of rod-like precipitates calcium carbonate of the present invention,
Chemical additives and/or crystal seed need not be added in preparation process, rod-like precipitates carbon only can be prepared by the control of technique
Sour calcium, can solve the problems, such as that prior art is used in cost height and poor product quality, and crystal seed method caused by chemical additives
The problems such as crystal seed prepares difficulty, and technological process is long.
Brief description of the drawings
Fig. 1 is the X ray diffracting spectrum that product is prepared according to the preparation method of different bar-shaped winnofils；Wherein
A is the X ray diffracting spectrum of the product of embodiment 1 in figure；B is the X ray diffracting spectrum of the product of embodiment 2；C is that embodiment 3 is produced
The X ray diffracting spectrum of thing；D is the X ray diffracting spectrum of the product of embodiment 4；E is the X-ray diffractogram of the product of embodiment 5
Spectrum；F is the X ray diffracting spectrum of the product of comparative example 1；
Fig. 2 is that the SEM that product is prepared according to the preparation method embodiment 1 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Fig. 3 is that the SEM that product is prepared according to the preparation method embodiment 2 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Fig. 4 is that the SEM that product is prepared according to the preparation method embodiment 3 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Fig. 5 is that the SEM that product is prepared according to the preparation method embodiment 4 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Fig. 6 is that the SEM that product is prepared according to the preparation method embodiment 5 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Fig. 7 is that the SEM that product is prepared according to the preparation method comparative example 1 of the rod-like precipitates calcium carbonate of the present invention shines
Piece.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
Embodiment 1
The preparation method of rod-like precipitates calcium carbonate, specific method are as follows：Lime stone is crushed to 2-3cm through jaw crusher
Lumpiness, calcining 400min obtains quick lime at 1100 DEG C, by 1:2kg quick limes are disposably added 25 by 4 buck mass ratio
In DEG C digestion water, after stirring 20min, obtained milk of lime is through 80 mesh vibratory sieve filter cleaners, regulation milk of lime solid content
13.0%.20kg milk of limes are taken, it is 55-60 DEG C to control temperature, and is sent into carbonators, opens stirring, treats that system temperature reaches
50 DEG C, regulation stir speed (S.S.) is 200r/min, is passed through carbonated mixed gas and starts to react, control carburizing reagent 0-20
The concentration of carbon dioxide in gas mixture is 10% in minute, flow 2m3/ h, react at 20 minutes adjust stir speed (S.S.) be
500r/min, gas concentration lwevel 30%, flow 4m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH
Body, carbonation reaction is terminated, obtains winnofil suspension, product is produced after drying 5h under the conditions of dehydration, 110 DEG C.
Products therefrom specific surface area is 7.11m2/ g, aragonite content 74.88%, XRD spectrum are shown in Fig. 1 (a), electromicroscopic photograph
See Fig. 2.
Embodiment 2
The preparation method of rod-like precipitates calcium carbonate, specific method are as follows：Lime stone is crushed to 2 through jaw crusher~
3cm lumpiness, calcining 350min obtains quick lime at 1150 DEG C, by 1:6 buck mass ratio disposably adds 2kg quick limes
In 25 DEG C of digestion water, after stirring 15min, obtained milk of lime is through 80 mesh vibratory sieve filter cleaners, regulation milk of lime solid content
15.3%.20kg milk of limes are taken, it is 60-65 DEG C to control temperature, and is sent into carbonators, opens stirring, treats that system temperature reaches
55 DEG C, regulation stir speed (S.S.) is 100r/min, is passed through carbonated mixed gas and starts to react, and controls in 0-20 minutes and mixes
The concentration for closing carbon dioxide in gas is 15%, flow 3m3/ h, it is 300r/ to react to stir speed (S.S.) is adjusted at 20 minutes
Min, gas concentration lwevel 33%, flow 4m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH, eventually
Blocking acidification reaction, winnofil suspension is obtained, product is produced after drying 5h under the conditions of dehydration, 110 DEG C.
Products therefrom specific surface area is 7.56m2/ g, aragonite content 83.35%, XRD spectrum are shown in Fig. 1 (b), electromicroscopic photograph
See Fig. 3.
Embodiment 3
The preparation method of rod-like precipitates calcium carbonate, specific method are as follows：Lime stone is crushed to 2 through jaw crusher~
3cm lumpiness, calcining 300min obtains quick lime at 1350 DEG C, by 1:7 buck mass ratio disposably adds 2kg quick limes
In 25 DEG C of digestion water, after stirring 20min, obtained milk of lime is through 80 mesh vibratory sieve filter cleaners, regulation milk of lime solid content
19.5%.20kg milk of limes are taken, it is 70~75 DEG C to control temperature, and is sent into carbonators, opens stirring, treats that system temperature reaches
65 DEG C, regulation stir speed (S.S.) is 300r/min, is passed through carbonated mixed gas and starts to react, and is controlled in 0~30 minute
The concentration of carbon dioxide in gas mixture is 10%, flow 4m3/ h, it is 600r/ to react to stir speed (S.S.) is adjusted at 30 minutes
Min, gas concentration lwevel 20%, flow 4m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH, eventually
Blocking acidification reaction, winnofil suspension is obtained, product is produced after drying 5h under the conditions of dehydration, 110 DEG C.
Products therefrom specific surface area is 6.84m2/ g, aragonite content 85.10%, XRD spectrum are shown in Fig. 1 (c), electromicroscopic photograph
See Fig. 4.
Embodiment 4
The preparation method of rod-like precipitates calcium carbonate, specific method are as follows：Lime stone is crushed to 2 through jaw crusher~
3cm lumpiness, calcining 300min obtains quick lime at 1200 DEG C, by 1:5 buck mass ratio disposably adds 2kg quick limes
In 25 DEG C of digestion water, after stirring 20min, obtained milk of lime is through 80 mesh vibratory sieve filter cleaners, regulation milk of lime solid content
12.1%.20kg milk of limes are taken, it is 50~55 DEG C to control temperature, and is sent into carbonators, opens stirring, treats that system temperature reaches
45 DEG C, regulation stir speed (S.S.) is 200r/min, is passed through carbonated mixed gas and starts to react, and is controlled in 0~30 minute
The concentration of carbon dioxide in gas mixture is 10%, flow 3m3/ h, it is 300r/ to react to stir speed (S.S.) is adjusted at 20 minutes
Min, gas concentration lwevel 25%, flow 4m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH, eventually
Blocking acidification reaction, winnofil suspension is obtained, product is produced after drying 5h under the conditions of dehydration, 110 DEG C.
Products therefrom specific surface area is 6.95m2/ g, aragonite content 79.42%, XRD spectrum are shown in Fig. 1 (d), electromicroscopic photograph
See Fig. 4.
Embodiment 5
The preparation method of rod-like precipitates calcium carbonate, specific method are as follows：Lime stone is crushed to 2 through jaw crusher~
3cm lumpiness, calcining 200min obtains quick lime at 1400 DEG C, by 1:10 buck mass ratio disposably adds 2kg quick limes
Enter in 25 DEG C of digestion water, after stirring 20min, obtained milk of lime adjusts milk of lime solid content through 80 mesh vibratory sieve filter cleaners
For 11.0%.20kg milk of limes are taken, it is 75~80 DEG C to control temperature, and is sent into carbonators, opens stirring, treats that system temperature reaches
To 70 DEG C, regulation stir speed (S.S.) is 200r/min, is passed through carbonated mixed gas and starts to react, and is controlled 0~20 minute
The concentration of interior carbon dioxide in gas mixture is 8%, flow 3m3/ h, it is 600r/ to react to stir speed (S.S.) is adjusted at 20 minutes
Min, gas concentration lwevel 28%, flow 5m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH, eventually
Blocking acidification reaction, winnofil suspension is obtained, product is produced after drying 5h under the conditions of dehydration, 110 DEG C.
Products therefrom specific surface area is 7.12m2/ g, aragonite content 80.33%, XRD spectrum are shown in Fig. 1 (e), electromicroscopic photograph
See Fig. 6.
Comparative example 1
After limestone crushing, calcining 200min obtains quick lime at 950 DEG C, by 1:5 buck mass ratio gives birth to 2kg
Lime disposably adds in 25 DEG C of digestion water the milk of lime for digesting to obtain and contained admittedly through 80 mesh vibratory sieve filter cleaners, regulation milk of lime
Measure as 12.5%.20kg milk of limes are taken, it is 55~60 DEG C to control temperature, and is sent into carbonators, opens stirring, treats system temperature
Reach 50 DEG C, regulation stir speed (S.S.) is 500r/min, is passed through carbonated mixed gas and starts to react, two in mixed gas
The concentration of carbonoxide is 30%, flow 5m3/ h, it is that 7.5 i.e. stopping is passed through gas to be carbonated to reactant mixture pH, terminates carbon
Acidification reaction, winnofil suspension is obtained, product is produced through being dehydrated, after drying.Products therefrom specific surface area is 7.79m2/
G, no aragonite, XRD spectrum are shown in Fig. 1 (f), and electromicroscopic photograph is shown in Fig. 6.
Product shape contrasts
Analysis contrast is carried out to the product of different embodiments and comparative example, the aragonite content of rod-like precipitates calcium carbonate is penetrated by X
Line diffractometer (XRD) tests post analysis, and pattern is characterized by SEM (SEM), and specific surface area is by BET specific surface area point
Analyzer characterizes.1-5 of the embodiment of the present invention and the product of comparative example 1 basic characterization information are shown in Table 1.
1 different embodiments of table and comparative example product shape contrast table
| Group | Aragonite content | Pattern | Specific surface area (m2/g) |
| Embodiment 1 | 74.88% | It is bar-shaped | 7.11 |
| Embodiment 2 | 83.35% | It is bar-shaped | 7.56 |
| Embodiment 3 | 85.10% | It is bar-shaped | 6.84 |
| Embodiment 4 | 79.42% | It is bar-shaped | 6.95 |
| Embodiment 5 | 80.33% | It is bar-shaped | 7.12 |
| Comparative example 1 | 0 | Fusiform | 7.79 |
As shown in table 1, bar-shaped winnofil can be prepared using the preparation method of the present invention, aragonite content reaches
74.88-85.35%, specific surface area 6.84-7.12m2/g.And the calcium carbonate that comparative example is prepared is then into fusiform, also
There is no aragonite, specific surface area 7.79m2/g.Illustrate the preparation method using rod-like precipitates calcium carbonate of the present invention, in preparation process
In need not add chemical additives and/or crystal seed, rod-like precipitates calcium carbonate only can be prepared by the control of technique.
The description of the foregoing specific illustrative embodiment to the present invention is to illustrate and the purpose of illustration.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (10)
1. a kind of preparation method of rod-like precipitates calcium carbonate, it is characterised in that comprise the following steps：
(1) digestion of limestone calcination and quick lime：Lime white is prepared；
(2) carbonation reaction：The lime white of the step (1) is inserted in carbonation reaction tower, opens stirring, controls reactant
It is that temperature is 40-80 DEG C, the concentration that carbon dioxide in gas mixture is passed through in reaction early stage 0-30min is 5-15vol%, flow
For 2-4m3/ h, the concentration that carbon dioxide in gas mixture is passed through in the carbonation reaction later stage are 25-40vol%, flow 4-
6m3/ h, stop ventilation when pH value of reaction system reaches 7.5, terminate carbonation reaction, obtain winnofil suspension；
(3) dehydrate：The step (2) is obtained into winnofil suspension through dehydration, is dried to obtain rod-like precipitates carbonic acid
Calcium.
2. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that will in the step (1)
Lime stone obtains quick lime after being calcined, and is 1 in mass ratio by quick lime and water:4-10 is mixed and fully digestion obtains lime
Slurry, lime white sieving, and lime white solid content is adjusted to 10-20%.
3. the preparation method of rod-like precipitates calcium carbonate according to claim 2, it is characterised in that the water temperature of the digestion
Spend for 20-30 DEG C.
4. the preparation method of rod-like precipitates calcium carbonate according to claim 2, it is characterised in that the lime white, which sieves, is
Cross 80 mesh sieves.
5. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that calcined to lime stone
Before, by limestone crushing to lumpiness 2-3cm.
6. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that the limestone calcination is
Quick lime is obtained in 1000-1450 DEG C of temperature lower calcination 200-400min.
7. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that the limestone calcination is
Quick lime is obtained in 1100-1300 DEG C of temperature lower calcination 300-400min.
8. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that carbon in the step (2)
The mixing speed of acidification reaction early stage is 100-300r/min.
9. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that carbon in the step (2)
The mixing speed of acidification reaction middle and later periods is 300-600r/min.
10. the preparation method of rod-like precipitates calcium carbonate according to claim 1, it is characterised in that in the step (3)
Dehydrate to dry 3-7h under the conditions of being 100-120 DEG C in temperature.
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| PCT/CN2017/110829 WO2019051987A1 (en) | 2017-09-18 | 2017-11-14 | Preparation method for rodlike precipitated calcium carbonate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112441605A (en) * | 2020-12-21 | 2021-03-05 | 安徽省宣城市华纳新材料科技有限公司 | Preparation method of vermicular precipitated calcium carbonate |
| CN115092948A (en) * | 2022-06-27 | 2022-09-23 | 山西石器时代新材料科技有限公司 | Method for preparing fine rod-like aragonite calcium carbonate by using flue gas and preparation method thereof |
| CN116177583A (en) * | 2021-11-26 | 2023-05-30 | 财团法人工业技术研究院 | Preparation method of rod-shaped calcium carbonate |
| CN117303423A (en) * | 2022-06-20 | 2023-12-29 | 中国科学院过程工程研究所 | Rod-shaped calcium carbonate and preparation method and application thereof |
| CN118439641A (en) * | 2024-03-27 | 2024-08-06 | 衢州五星纳米材料有限公司 | Precipitated calcium carbonate production and recovery process |
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| CN117303423A (en) * | 2022-06-20 | 2023-12-29 | 中国科学院过程工程研究所 | Rod-shaped calcium carbonate and preparation method and application thereof |
| CN115092948A (en) * | 2022-06-27 | 2022-09-23 | 山西石器时代新材料科技有限公司 | Method for preparing fine rod-like aragonite calcium carbonate by using flue gas and preparation method thereof |
| CN115092948B (en) * | 2022-06-27 | 2024-03-15 | 山西石器时代新材料科技有限公司 | Fine rod-shaped aragonite calcium carbonate prepared by utilizing flue gas and preparation method thereof |
| CN118439641A (en) * | 2024-03-27 | 2024-08-06 | 衢州五星纳米材料有限公司 | Precipitated calcium carbonate production and recovery process |
| CN118439641B (en) * | 2024-03-27 | 2024-12-03 | 衢州五星纳米材料有限公司 | Precipitated calcium carbonate production and recovery process |
Also Published As
| Publication number | Publication date |
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| WO2019051987A1 (en) | 2019-03-21 |
| CN107445188B (en) | 2019-03-15 |
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