CN1548375A - Nano level light calcium carbonate producing process and apparatus - Google Patents
Nano level light calcium carbonate producing process and apparatus Download PDFInfo
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- CN1548375A CN1548375A CNA031170102A CN03117010A CN1548375A CN 1548375 A CN1548375 A CN 1548375A CN A031170102 A CNA031170102 A CN A031170102A CN 03117010 A CN03117010 A CN 03117010A CN 1548375 A CN1548375 A CN 1548375A
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Abstract
The present invention features that calcium hydroxide suspension from the slaking step is first cooled in a static mixer to about 30 deg.c, and then mixed with crystal form controlling agent and reaction inhibitor in the static mixer; the mixed calcium hydroxide suspension and CO2 gas are high speed sheared and reacted in a pipeline high-shearing emulsifying machine with casing, stator-rotor combination and cooling water channel; and after dispersant is mixed to the reacted calcium carbonate suspension in a static mixer, the mixture is finally dewatered, dried and surface treated. The present invention solves the technological problems of large and uneven product granularity, instable product quality, etc.
Description
Technical field:
The invention relates to the compound of calcium, especially about the production method of nano level light calcium carbonate.
Background technology:
Carbonization is a main path of producing nanometer light calcium carbonate, certain density refining calcium hydroxide suspension liquid is fed carbon dioxide, and add suitable crystal control agent and reaction and restrain system and make its carbonization to terminal, obtain requiring the calcium carbonate serosity of crystalline form, dewater again, dry, surface treatment, just can produce the nano level light calcium carbonate.But this theory to be become industrialization, great relation be arranged with the production technique and the equipment of carbonation reaction.Existing carbonation reaction comes branch to have five kinds by different production technique and equipment: intermittently bubbling carbonizing method, multistage spray carbonation method, injection absorb carborization, hypergravity reactive crystallization carborization and ultrasonic cavitation carborization.What domestic and international at present great majority adopted is that intermittently the bubbling carbonizing method is produced the nano level light calcium carbonate, its equipment is simple, but the shortcoming of this method is that size-grade distribution inequality and fineness are not enough, operate wayward, quality product poor reproducibility between causing batch, there is certain difficulty in industrial mass production.The multistage spray carbonation method can make the calcium carbonate superfine powder of median size between 5～20 nanometers, but its equipment is huge, floor space is big, so the investment height of equipment and civil engineering; Particularly the atomization quality of nozzle is a key issue, the time that the size of the drop of spraying not only influences its area that contacts with carbonic acid gas and stops in carbonating tower, and can cause that crystal particle diameter increases and the uneven serious consequence of particle diameter.Industrial practice shows, the multistage spray carbonation tower that atomization quality is not good enough, the particle diameter that its product is little is also wanted 30 nanometers, and big particle diameter is up to 500～800 nanometers, use the nozzle bore of minor diameter can improve atomization quality, but cause obstruction easily, do not find the good way that solves this contradiction so far as yet, cause the multistage spray carbonation method to promote the use seldom industrial.Spray absorption carborization, hypergravity reactive crystallization carborization and ultrasonic cavitation carborization and when limited production, can both obtain comparatively satisfied result, but when further amplifying scale, skewness, reaction heat have occurred surmising and a series of difficult problems such as can't take away, also failed at present effectively to solve.
Summary of the invention:
The object of the present invention is to provide a kind of production method and equipment, solve that the product particle diameter is excessive, granularity is uneven, the technical problem of product batches quality instability and reaction heat with nano level light calcium carbonate of brand-new carbonization process.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A kind of production method of nano level light calcium carbonate, it is characterized in that: at first the calcium hydroxide suspension liquid that comes from the digestion operation is cooled to about 30 ℃ with static mixer, adding crystal control agent again mixes with static mixer with the reaction inhibitor, then mixed calcium hydroxide suspension liquid and carbon dioxide while introduction pipe line formula high-shear emulsion machine are carried out high-strength shearing carburizing reagent, dispersion agent is added lime carbonate suspension liquid after the carburizing reagent, and carry out uniform mixing with static mixer, at last again through dehydration, drying and surface treatment.
The production method of above-mentioned nano level light calcium carbonate is characterized in that: this carbon dioxide can spray into behind the calcium hydroxide suspension liquid more together introduction pipe line formula high-shear emulsion machine dispersedly with splash head and carry out high-strength shearing carburizing reagent.
A kind of production unit of nano level light calcium carbonate is characterized in that: the pipeline high-shear emulsifying agent that high-strength shearing carburizing reagent is used comprises casing, at least one group of stator-rotor assembly and cooling-water duct; Stator in this stator-rotor assembly is fixed on the casing inner wall, itself and the corresponding wall of rotor are provided with many apertures, rotor is fixed in the rotating shaft and with bearing and is bearing in the casing, has minimum gap between it and the stator, each stator-rotor assembly is separated into the housing inner chamber suction zone and throws away the district, and the district that throws away of prime stator-rotor assembly communicates with the suction zone of back level stator-rotor assembly; Cooling-water duct can be arranged in the interlayer of casing and be integral with casing, also can coil separately to be arranged in the space that throws away the district.
The production unit of above-mentioned nano level light calcium carbonate is characterized in that: the static mixer that is provided with SV type, SX type, SL type, SK type, SH type or JHF type.
The production unit of above-mentioned nano level light calcium carbonate, it is characterized in that: be provided with the gas injection apparatus that comprises splash head that adds carbon dioxide, this splash head is towards the flow direction of calcium hydroxide suspension liquid, and it is provided with many apertures that are spread of radioactivity.
The present invention has following advantage:
1. the present invention not only is provided with cooling stages, in order to reduce the temperature of calcium hydroxide suspension liquid, and mix at secondary, high strength shears carbonation stage employed equipment itself and all has good cooling effect, reaction heat in the whole carbonization process is taken away, formed the good environment of carbonization at low temperature, create necessary condition for preparing high-quality calcium carbonate superfine powder, guaranteed the stable of quality product.
2. pipeline high-shear emulsion machine, utilize the rotor of high speed rotating, and and stator between minimum gap produced the shearing force of superstrength with calcium hydroxide particle in the suspension liquid and the further refinement of carbonic acid gas bubble, and the turbulence tempestuously of water generates wherein, this constantly upgrades the liquid phase surface of this suspension liquid at a high speed, quicken calcium hydroxide and carbon dioxide and dissolved in the mass transfer process of liquid phase, also quickened simultaneously the reaction process of calcium hydroxide and carbonic acid gas, the uptake rate and the utilization ratio of carbon dioxide have not only been improved widely, and calcium ion and carbon acid ion concentration in the solution have been improved at the carbonization crystallization initial stage, form the required degree of supersaturation of crystallization, form a large amount of nucleus, impel product cut size to develop, created brand-new high strength and sheared the carbonization flow process to the miniaturization direction.
3. the particle diameter of the lightweight carbon nano level acid calcium of producing is little, and about several～tens nanometers, and all degree is high.
4. outside the agent of all devices exception pipeline formula high-shear emulsifying, be general-purpose equipment.The integral device floor space is little, and less investment is suitable for scale operation.
Description of drawings:
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is a pipeline high-shear emulsion machine structural representation of the present invention.
Fig. 3 is that carbon dioxide jet head and calcium hydroxide suspension liquid flow to configuration schematic diagram.
Embodiment:
See also shown in Figure 1ly, the present invention at first utilizes static mixer with good heat transfer effect that the calcium hydroxide suspension liquid from the digestion operation is cooled off, and its temperature is reduced to about 30 ℃ from 50～80 ℃.Cooled calcium hydroxide suspension liquid adds an amount of crystal control agent in the process that flows into next static mixer and system is restrained in reaction, and mixes equably in this static mixer.Through importing carbon dioxide behind the above-mentioned blended calcium hydroxide suspension liquid outflow static mixer; Be mixed with crystal control agent and reaction is restrained in calcium hydroxide suspension liquid of system for making the carbon dioxide gas physical efficiency be dispersed in this, the jet apparatus 2 (referring to Fig. 3) that can be provided with by 22 groups of pneumatic tube 21 and splash heads carries out initial dispersion.The pneumatic tube 21 of this jet apparatus 2 inserts behind the liquid-transport pipe-lines to 90 ° of front curve, make to have the flow direction that numerous splash heads 22 that are the tiny spray orifice of radial setting are faced the calcium hydroxide suspension liquid, carbon dioxide is tentatively disperseed in the calcium hydroxide suspension liquid better.The calcium hydroxide suspension liquid inflow line formula high-shear emulsion machine that is dispersed with carbon dioxide is carried out high strength shearing carbonation stage, and the good carbon dioxide initial distribution can guarantee to give full play to the effect of mulser.Stator-rotor assembly and cooling-water duct 1-8 that this pipeline high-shear emulsion machine (as shown in Figure 2) comprises casing 1-3, is made of stator 1-4 and rotor 1-5.Stator, rotor assembly are at least one group, also can be two groups, three groups of serial connection, or more groups.Stator 1-4 is fixed on the inwall of casing 1-3, and its wall relative with rotor 1-5 is provided with the aperture of many circles or bar shaped.Rotor 1-5 is fixed on the rotating shaft 1-6, and is bearing in the casing 1-3 with bearing 1-7, has minimum gap between rotor 1-5 and the stator 1-3.Stator-rotor assembly is separated into suction zone 1-9 with casing 1-3 and throws away district 1-10, and the district 1-10 that throws away of prime stator-rotor assembly communicates with the suction zone 1-9 of back level stator-rotor assembly.The suction zone 1-9 of first step stator-rotor assembly communicates with admission port 1-1 on being arranged on casing 1-3, and level stator-rotor assembly throws away district 1-10 and export 1-2 and do not communicate.Drive rotor 1-5 by motor-driven axle 1-6 and make high speed rotating, the calcium hydroxide suspension liquid that the suction of its generation will be dispersed with carbon dioxide is sucked into suction zone 1-9 by inlet 1-1, and the gap between rotor 1-5 and stator 1-4, thrown away to throwing away among the district 1-10 by the aperture on the stator 1-4 by the centrifugal force of rotor 1-5.When this suspension liquid by rotor 1-5 and 1-4 gap the time, be subjected to the superstrength shearing action that stator-rotor assembly high speed relative movement produces, the shearing of this superstrength makes the carbon dioxide in this suspension liquid be sheared the tiny bubble that becomes to have only tens microns sizes, enlarge its mass transfer specific surface area, improved the specific absorption and the utilization ratio of carbon dioxide widely; Calcium hydroxide particle in the suspension liquid is sheared refinement, and as water turbulence tempestuously under the shearing action of superstrength of the liquid phase of suspension liquid, make the wherein violent motion and the dissolving of the corresponding do of calcium hydroxide particle of solid phase, formed suspension liquid liquid phase surface high speed update mode constantly, quicken carbon dioxide and dissolved in the mass transfer process of liquid phase, improved calcium ion and carbon acid ion concentration in the carbonization crystallization initial stage solution, increase the required degree of supersaturation of crystallization, raising of nucleus nucleation rate and quantity are increased, product cut size is developed to the miniaturization direction, thereby quickened the carbonation reaction of carbonic acid gas and calcium hydroxide.High-intensity shearing simultaneously makes the further refinement of calcium carbonate granule of generation.Cooling-water duct 1-8 is arranged in the interlayer of casing 1-3, forms one with casing 1-3, or is coiled in separately and throws away in the casing 1-3 among the district 1-10, and its water inlet and water outlet are drawn outside the casing 1-3; By the water coolant in the cooling-water duct 1-8 that flows through the reaction heat absorption that above-mentioned carburizing reagent produces is taken out of outside the machine, guaranteed the excellent environment of carbonization at low temperature, necessary condition is provided for improving the quality of products.Liquid after carbonization finishes is discharged from outlet 1-2, add again and enter another static mixer behind the dispersion agent and mix, again through traditional dehydration, drying and surface treatment, can obtain the nano level light calcium carbonate of median size after the mixing in several～tens nanometers.
Cooling of the present invention, the employed static mixer of mix stages are the static mixers of commercially available SV type, SX type, SL type, SK type, SH type or JHF type.
Claims (5)
1, a kind of production method of nano level light calcium carbonate, it is characterized in that: at first the calcium hydroxide suspension liquid that comes from the digestion operation is cooled to about 30 ℃ with static mixer, adding crystal control agent again mixes with static mixer with the reaction inhibitor, then mixed calcium hydroxide suspension liquid and carbon dioxide while introduction pipe line formula high-shear emulsion machine are carried out high-strength shearing carburizing reagent, dispersion agent is added lime carbonate suspension liquid after the carburizing reagent, and carry out uniform mixing with static mixer, at last again through dehydration, drying and surface treatment.
2, the production method of nano level light calcium carbonate according to claim 1 is characterized in that: this carbon dioxide can spray into behind the calcium hydroxide suspension liquid more together introduction pipe line formula high-shear emulsion machine dispersedly with splash head and carry out high-strength shearing carburizing reagent.
3, the production unit of a kind of nano level light calcium carbonate according to claim 1 is characterized in that: the pipeline high-shear emulsifying agent that high-strength shearing carburizing reagent is used comprises casing, at least one group of stator-rotor assembly and cooling-water duct; Stator in this stator-rotor assembly is fixed on the casing inner wall, itself and the corresponding wall of rotor are provided with many apertures, rotor is fixed in the rotating shaft and with bearing and is bearing in the casing, has minimum gap between it and the stator, each stator-rotor assembly is separated into the housing inner chamber suction zone and throws away the district, and the district that throws away of prime stator-rotor assembly communicates with the suction zone of back level stator-rotor assembly; Cooling-water duct can be arranged in the interlayer of casing and be integral with casing, also can independent coiling be arranged in the space that throws away the district.
4, the production unit of nano level light calcium carbonate according to claim 3 is characterized in that: the static mixer that is provided with SV type, SX type, SL type, SK type, SH type or JHF type.
5, according to the production unit of claim 3 or 4 described nano level light calcium carbonates, it is characterized in that: be provided with the gas injection apparatus that comprises splash head that adds carbon dioxide, this splash head is towards the flow direction of calcium hydroxide suspension liquid, and it is provided with many apertures that are spread of radioactivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03117010 CN1238254C (en) | 2003-05-20 | 2003-05-20 | Nano level light calcium carbonate producing process and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03117010 CN1238254C (en) | 2003-05-20 | 2003-05-20 | Nano level light calcium carbonate producing process and apparatus |
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| CN1548375A true CN1548375A (en) | 2004-11-24 |
| CN1238254C CN1238254C (en) | 2006-01-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2238077A1 (en) * | 2007-12-14 | 2010-10-13 | Timo Olavi Imppola | A method and apparatus to produce precipitated calcium carbonate |
| CN103659627A (en) * | 2012-09-20 | 2014-03-26 | 周道林 | Bamboo linen polishing wheel and manufacturing method thereof |
| CN104891545A (en) * | 2015-05-25 | 2015-09-09 | 福建鸿丰纳米科技有限公司 | Carbonization reaction device and method for nano calcium carbonate production |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
| CN115443252A (en) | 2020-02-25 | 2022-12-06 | 艾瑞莱克公司 | Method and system for treating lime to form vaterite |
| CN116018195A (en) | 2020-06-30 | 2023-04-25 | 艾瑞莱克公司 | Method and system for forming vaterite from calcined limestone using an electric kiln |
-
2003
- 2003-05-20 CN CN 03117010 patent/CN1238254C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2238077A1 (en) * | 2007-12-14 | 2010-10-13 | Timo Olavi Imppola | A method and apparatus to produce precipitated calcium carbonate |
| EP2238077A4 (en) * | 2007-12-14 | 2011-09-28 | Timo Olavi Imppola | A method and apparatus to produce precipitated calcium carbonate |
| CN103659627A (en) * | 2012-09-20 | 2014-03-26 | 周道林 | Bamboo linen polishing wheel and manufacturing method thereof |
| CN104891545A (en) * | 2015-05-25 | 2015-09-09 | 福建鸿丰纳米科技有限公司 | Carbonization reaction device and method for nano calcium carbonate production |
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| CN1238254C (en) | 2006-01-25 |
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