CN101913640B - Method for preparing superfine activated calcium carbonate - Google Patents
Method for preparing superfine activated calcium carbonate Download PDFInfo
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- CN101913640B CN101913640B CN 201010257598 CN201010257598A CN101913640B CN 101913640 B CN101913640 B CN 101913640B CN 201010257598 CN201010257598 CN 201010257598 CN 201010257598 A CN201010257598 A CN 201010257598A CN 101913640 B CN101913640 B CN 101913640B
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Abstract
The invention relates to the technical field of preparation methods of calcium carbonate, in particular to a method for preparing superfine activated calcium carbonate. The method comprises the following steps of: (a) adding calcium oxide and water into a paddle-type slaker by a proportion, sieving a calcium hydroxide suspension and then adding into a coarse slurry pool; statically subsiding the slurry in the coarse slurry pool, carrying out secondary cyclone separation on the coarse slurry subjected to static subsiding and then adding into a slurry regulating pool; (b) simultaneously entering a static mixer by the slurry in the slurry regulating pool through a metering pump and carbon dioxide gas through a flow gauge for pre-carbonization, and entering a carbonization tower by the slurry subjected to the pre-carbonization; (c) carbonizing; (d) closing the carbon dioxide and adding the slurry into a slaked slurry pool; (e) converging the slurry in the slaked slurry pool through the metering pump and a surfactant metering pump into a three-stage mixing pump, then entering the static mixer, and finally entering a homogenizing pool; and (f) carrying out press filtering, drying, pulverizing, screening, and the like on the slurry in the homogenizing pool to obtain the superfine activated calcium carbonate. The superfine activated calcium carbonate can be cubic granules and has regular appearance and good dispersity.
Description
Technical field
The present invention relates to lime carbonate preparation method technical field, especially a kind of method for preparing superfine activated calcium carbonate.
Background technology
Produce at present superfine activated calcium carbonate and generally all adopt carborization, i.e. calcium hydroxide suspension liquid and carbon dioxide reaction generate lime carbonate, its reaction equation:
Ca(OH)
2+CO
2＝CaCO
3+H
2O
Industrialized production is; Band stirs bubbling carborization, multistage spray carbonation method, hypergravity carborization.
Carbonization process is a calcium carbonate nano particle forming process, and nano-calcium carbonate will have excellent application value also must carry out surface activation process, i.e. after carbonization finishes, the nano-calcium carbonate slurry is delivered in the surface activation process equipment processes.
Above-mentioned manufacturing technique requirent:
The concentration of calcium hydroxide suspension liquid during carbonization (calcium hydroxide mass percent concentration) is less than 12～20.
Carbonization finishes the back and moves to slurry in the surface activation process equipment, is heated to slurry more than 80 degree Celsius then, adds prefabricated tensio-active agent, carries out disperseing strongly for a long time and stirring again.
The problem that above-mentioned production technique exists:
Calcium hydroxide concentration is lower during carbonization, so the production intensity of equipment is lower, under identical throughput condition, will throw more fund.
Calcium hydroxide concentration is lower during carbonization, and too much mechanical water has increased the energy consumption of heating and cooling meaninglessly.
Carbonization process will stir, and consume electric energy.
Energy expenditure is big; The calcium hydroxide suspension liquid is produced through quicklime and water reaction, and nano-calcium carbonate is produced through calcium hydroxide and carbon dioxide reaction, and these two reactions all have a large amount of heat to discharge; Want carbonization at low temperature must carry out machinery cooling, the consumption that has brought the energy.
Will be heated to slurry more than 80 degree Celsius during surface activation process, also will give the effect of the high shear of long-time (about 60 minutes), energy consumption is very big.
Summary of the invention
Produce the very big deficiency of superfine activated calcium carbonate energy consumption in order to overcome existing carborization, the invention provides a kind of method for preparing superfine activated calcium carbonate.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method for preparing superfine activated calcium carbonate, and this method may further comprise the steps:
A, quicklime and water are got into oar formula digestion machine in 1: 3.5～5 ratios; The calcium hydroxide suspension liquid gets into brown stock chest through 100～200 mesh sieves; Slurry was brown stock chest statvolt 24～150 hours; Thick slurry through statvolt carries out getting into the pond of sizing mixing after the secondary spinning liquid separates, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 15～22;
Slurry in b, the pond of sizing mixing gets into motionless mixer through volume pump and dioxide gas through under meter simultaneously, carries out preparatory carbonization, and the slurry after the carbonization gets into carbonating tower in advance;
The carbonic acid gas inlet is 20～100 cubic meters per minute when c, carbonization, and carbonization to 80～90% transfers 5～50 cubic meters per minute to until slurry pH value 6.5～7.0, and whole carbonization process carries out at normal temperatures;
D, closing carbon dioxide, slurry get into ripe stock tank;
Slurry in the e, ripe stock tank converges three grades of mixeds of entering through volume pump and tensio-active agent volume pump and gets into motionless mixer again, gets into balancing reservoir at last;
Slurry in f, the balancing reservoir carries out press filtration, drying, pulverizing, screening etc. and can obtain superfine activated calcium carbonate;
Wherein: said water is the nano-calcium carbonate factory effluent of tap water or treated mistake; The carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said tensio-active agent is resinous acid or lipid acid, soap or oleic acid; Tensio-active agent cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container, and said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
The invention has the beneficial effects as follows, the present invention compared with prior art, its significant advantage is:
1, broken the conventional art that low-temperature and low-concentration prepares superfine activated calcium carbonate; Realized that calcium hydroxide slurry carries out preparatory carbonization again when being conveyed into carbonating tower; High density normal temperature carbonization then, the continuous coating are produced fine calcium carbonate; Compare its production technique with conventional art simple, and energy consumption is low.
2, normal temperature coats, and need not heating, saves the energy.
3, employing is coated with continuously and is beneficial to the stable of quality product.
4, the fine calcium carbonate of preparation is a cubic granules, and pattern is regular, good dispersivity.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the transmission electron microscope photo;
Fig. 2 is preparatory carbonization synoptic diagram;
Fig. 3 coats synoptic diagram continuously.
Among the figure, 1. slurry, 2. volume pump, 3. dioxide gas, 4. under meter, 5. motionless mixer, 6. grout outlet, 7. ripe slurry volume pump, 8. promoting agent volume pump, 9. three grades of mixeds.
Embodiment
Combine accompanying drawing that the present invention is done further detailed explanation now.These accompanying drawings are the synoptic diagram of simplification, substruction of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
Like Fig. 1 is the transmission electron microscope photo, a kind of method for preparing superfine activated calcium carbonate, and this method may further comprise the steps:
A, quicklime and water 1: 3.5 by mass percentage～5 ratios are got into oar formula digestion machine; The calcium hydroxide suspension liquid gets into brown stock chest through 100～200 mesh sieves; Slurry was brown stock chest statvolt 24～150 hours; Thick slurry through statvolt carries out getting into the pond of sizing mixing after the secondary spinning liquid separates, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 15～22;
Slurry 1 in b, the pond of sizing mixing gets into motionless mixer 5 through volume pump 2 and dioxide gas 3 through under meter 4 simultaneously, carries out preparatory carbonization, and the slurry 1 after the carbonization gets into carbonating tower from grout outlet 6 in advance; Like Fig. 2 is preparatory carbonization synoptic diagram;
The carbonic acid gas inlet is 20～100 cubic meters per minute when c, carbonization, and carbonization to 80～90% transfers 5～50 cubic meters per minute to until slurry pH value 6.5～7.0, and whole carbonization process carries out at normal temperatures;
D, closing carbon dioxide, slurry get into ripe stock tank;
Slurry in e, the ripe stock tank converges three grades of mixeds 9 of entering through ripe slurry volume pump 7 and tensio-active agent volume pump 8 and gets into motionless mixer 5 again, gets into balancing reservoir at last; Like Fig. 3 is to coat synoptic diagram continuously; Acid of tensio-active agent usable resins or lipid acid, soap, oleic acid etc.; Tensio-active agent should cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container;
Slurry in f, the balancing reservoir carries out press filtration, drying, pulverizing, screening etc. and can obtain superfine activated calcium carbonate.
Wherein: said water is the nano-calcium carbonate factory effluent of tap water or treated mistake; The carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said tensio-active agent is resinous acid or lipid acid, soap or oleic acid; Tensio-active agent cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container, and said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
Embodiment 1:
A kind of method for preparing superfine activated calcium carbonate, this method may further comprise the steps:
A, quicklime and water are got into oar formula digestion machine in 1: 3.5 ratio, said water can be the nano-calcium carbonate factory effluent of tap water or treated mistake; The calcium hydroxide suspension liquid gets into brown stock chest through 100 mesh sieves, and slurry is brown stock chest statvolt 24 hours, carries out the secondary spinning liquid through the thick slurry of statvolt and separates the back entering pond of sizing mixing, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 15;
Slurry 1 in b, the pond of sizing mixing gets into motionless mixer 5 through volume pump 2 and dioxide gas 3 through under meter 4 simultaneously, carries out preparatory carbonization, and the slurry 1 after the carbonization gets into carbonating tower from grout outlet 6 in advance;
The carbonic acid gas inlet is 20 cubic meters per minute when c, carbonization, and carbonization to 80% transfers 5 cubic meters per minute to until slurry pH value 6.5, and whole carbonization process carries out at normal temperatures;
D, closing carbon dioxide, slurry get into ripe stock tank;
Slurry in e, the ripe stock tank converges three grades of mixeds 9 of entering through ripe slurry volume pump 7 and tensio-active agent volume pump 8 and gets into motionless mixer 5 again, gets into balancing reservoir at last; Said dosage of surfactant is the per-cent 3 for the lime carbonate quality; Acid of tensio-active agent usable resins or lipid acid, soap, oleic acid etc.; Tensio-active agent should cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container;
Slurry in f, the balancing reservoir carries out press filtration, drying, pulverizing, screening etc. and can obtain superfine activated calcium carbonate;
Wherein: the carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
Embodiment 2:
A kind of method for preparing superfine activated calcium carbonate, this method may further comprise the steps:
A, quicklime and water are got into oar formula digestion machine in 1: 4.5 ratio, said water can be the nano-calcium carbonate factory effluent of tap water or treated mistake; The calcium hydroxide suspension liquid gets into brown stock chest through 150 mesh sieves, and slurry is brown stock chest statvolt 48 hours, carries out the secondary spinning liquid through the thick slurry of statvolt and separates the back entering pond of sizing mixing, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 22;
Slurry 1 in b, the pond of sizing mixing gets into motionless mixer 5 through volume pump 2 and dioxide gas 3 through under meter 4 simultaneously, carries out preparatory carbonization, and the slurry 1 after the carbonization gets into carbonating tower from grout outlet 6 in advance;
The carbonic acid gas inlet is 50 cubic meters per minute when c, carbonization, and carbonization to 90% transfers 20 cubic meters per minute to until slurry pH value 6.9, and whole carbonization process carries out at normal temperatures;
D, closing carbon dioxide, slurry get into ripe stock tank;
Slurry in e, the ripe stock tank converges three grades of mixeds 9 of entering through ripe slurry volume pump 7 and tensio-active agent volume pump 8 and gets into motionless mixer 5 again, gets into balancing reservoir at last; Said dosage of surfactant is the per-cent 7 for the lime carbonate quality; Acid of tensio-active agent usable resins or lipid acid, soap, oleic acid etc.; Tensio-active agent should cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container;
Slurry in f, the balancing reservoir carries out press filtration, drying, pulverizing, screening etc. and can obtain superfine activated calcium carbonate;
Wherein: the carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
Embodiment 3:
A kind of method for preparing superfine activated calcium carbonate, this method may further comprise the steps:
A, quicklime and water are got into oar formula digestion machine in 1: 5 ratio, said water can be the nano-calcium carbonate factory effluent of tap water or treated mistake; The calcium hydroxide suspension liquid gets into brown stock chest through 120 mesh sieves, and slurry is brown stock chest statvolt 60 hours, carries out the secondary spinning liquid through the thick slurry of statvolt and separates the back entering pond of sizing mixing, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 18;
Slurry 1 in b, the pond of sizing mixing gets into motionless mixer 5 through volume pump 2 and dioxide gas 3 through under meter 4 simultaneously, carries out preparatory carbonization, and the slurry 1 after the carbonization gets into carbonating tower from grout outlet 6 in advance;
The carbonic acid gas inlet is 80 cubic meters per minute when c, carbonization, and carbonization to 85% transfers 10 cubic meters per minute to until slurry pH value 6.7, and whole carbonization process carries out at normal temperatures;
D, closing carbon dioxide, slurry get into ripe stock tank;
Slurry in e, the ripe stock tank converges three grades of mixeds 9 of entering through ripe slurry volume pump 7 and tensio-active agent volume pump 8 and gets into motionless mixer 5 again, gets into balancing reservoir at last; Said dosage of surfactant is the per-cent 5 for the lime carbonate quality; Acid of tensio-active agent usable resins or lipid acid, soap, oleic acid etc.; Tensio-active agent should cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container;
Slurry in f, the balancing reservoir carries out press filtration, drying, pulverizing, screening etc. and can obtain superfine activated calcium carbonate;
Wherein: the carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
Embodiment 4:
A, employing slurry formula digestion machine can carry out high density digestion, and high density helps the abundant digestion of quicklime;
B, postdigestive slurry want statvolt more than 24 hours, are convenient to follow-up slurry and purify and modulate;
C, carbonic acid gas volume percent are 20～36;
The calcium hydroxide slurry flow is per hour 60 cubic metres when d, preparatory carbonization, and carbon dioxide flow is 1～5 cubic metre of a PM;
E, carbonating tower useful volume are 20 cubic metres, and aspect ratio is 7.5: 1, and shell will be incubated;
The nucleus that f, variable carbonization mode meet nanometer grade calcium carbonate generates, the rule of growth, also makes full use of carbonic acid gas simultaneously;
G, the acid of tensio-active agent usable resins or lipid acid, soap, oleic acid etc.;
H, tensio-active agent should cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container;
The operational throughput design and the control of i, ripe slurry and tensio-active agent are to reach through under meter, sequence controller (PLC), frequency transformer.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification sheets, must confirm its technical scope according to the claim scope.
Claims (2)
1. a method for preparing superfine activated calcium carbonate is characterized in that, this method may further comprise the steps:
One, quicklime and water are got into oar formula digestion machine in 1: 3.5～5 ratios; The calcium hydroxide suspension liquid gets into brown stock chest through 100～200 mesh sieves; Slurry was brown stock chest statvolt 24～150 hours; Thick slurry through statvolt carries out getting into the pond of sizing mixing after the secondary spinning liquid separates, and slurry is allocated in sizing mixing to calcium hydroxide mass percent concentration 15～22;
The slurry (1) of two, sizing mixing in the pond gets into motionless mixer (5) through volume pump (2) and dioxide gas (3) through under meter (4) simultaneously, carries out preparatory carbonization, and the slurry after the carbonization gets into carbonating tower from grout outlet (6) in advance;
Three, the carbonic acid gas inlet is 20～100 cubic meters per minute during carbonization, and carbonization to 80～90% transfers 5～50 cubic meters per minute to until slurry pH value 6.5～7.0, and whole carbonization process carries out at normal temperatures;
Four, closing carbon dioxide, slurry get into ripe stock tank;
Five, the slurry in the ripe stock tank converges through ripe slurry volume pump (7) and tensio-active agent volume pump (8) and gets into three grades of mixeds (9) and get into motionless mixer (5) again, gets into balancing reservoir at last;
Six, the slurry in the balancing reservoir carries out press filtration, drying, pulverizing, screening and can obtain superfine activated calcium carbonate;
Wherein: said water is the nano-calcium carbonate factory effluent of tap water or treated mistake; The carbonating tower useful volume is 20 cubic metres, and aspect ratio is 7.5: 1, and shell is what be incubated; Said tensio-active agent is resinous acid or lipid acid or soap; Tensio-active agent cannot not be prefabricated into lowly the liquid of 25% concentration, and the insulation storage is gone in the container, and said dosage of surfactant is the per-cent 3～7 for the lime carbonate quality; The operational throughput design and the control of said ripe slurry and tensio-active agent are to reach through under meter, sequence controller, frequency transformer.
2. a kind of method for preparing superfine activated calcium carbonate according to claim 1 is characterized in that, said lipid acid is oleic acid.
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Cited By (1)
| 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 |
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|---|---|---|---|---|
| AU2021226337A1 (en) | 2020-02-25 | 2022-09-08 | Arelac, Inc. | Methods and systems for treatment of limestone to form vaterite |
| GB2613474A (en) | 2020-06-30 | 2023-06-07 | Arelac Inc | Methods and systems for forming vaterite from calcined limestone using electric kiln |
| CN112028101B (en) * | 2020-07-20 | 2023-01-10 | 建德华明科技有限公司 | Preparation method of dispersible calcium carbonate |
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| US5332564A (en) * | 1992-07-10 | 1994-07-26 | Ecc International Inc. | Process for production of rhombic shaped precipitated calcium carbonate |
| CN1104179A (en) * | 1994-09-16 | 1995-06-28 | 广东省恩平市广平化工实业有限公司 | Super-fine active calcium carbide production method |
| CN1348428A (en) * | 1999-03-31 | 2002-05-08 | 矿业技术有限公司 | Process for the preparation of discrete particles of calcium carbonate |
| CN1375456A (en) * | 2002-02-07 | 2002-10-23 | 上海建筑材料集团新材料有限公司 | Nano level active calcium carbonate for special use |
| CN1749168A (en) * | 2005-10-21 | 2006-03-22 | 颜鑫 | Continuous bubbling carbonizing new process for producing super fine active calcium carbonate |
| CN1807252A (en) * | 2006-01-18 | 2006-07-26 | 内蒙古蒙西纳米材料有限责任公司 | Preparation method of nanometer grade active calcium carbonate special for sealing material |
-
2010
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5332564A (en) * | 1992-07-10 | 1994-07-26 | Ecc International Inc. | Process for production of rhombic shaped precipitated calcium carbonate |
| CN1104179A (en) * | 1994-09-16 | 1995-06-28 | 广东省恩平市广平化工实业有限公司 | Super-fine active calcium carbide production method |
| CN1348428A (en) * | 1999-03-31 | 2002-05-08 | 矿业技术有限公司 | Process for the preparation of discrete particles of calcium carbonate |
| CN1375456A (en) * | 2002-02-07 | 2002-10-23 | 上海建筑材料集团新材料有限公司 | Nano level active calcium carbonate for special use |
| CN1749168A (en) * | 2005-10-21 | 2006-03-22 | 颜鑫 | Continuous bubbling carbonizing new process for producing super fine active calcium carbonate |
| CN1807252A (en) * | 2006-01-18 | 2006-07-26 | 内蒙古蒙西纳米材料有限责任公司 | Preparation method of nanometer grade active calcium carbonate special for sealing material |
Cited By (1)
| 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 |
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