CN103011225A - Carbonization kettle and method for preparing spherical calcium carbonate by using carbonization kettle - Google Patents
Carbonization kettle and method for preparing spherical calcium carbonate by using carbonization kettle Download PDFInfo
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- CN103011225A CN103011225A CN201210523972XA CN201210523972A CN103011225A CN 103011225 A CN103011225 A CN 103011225A CN 201210523972X A CN201210523972X A CN 201210523972XA CN 201210523972 A CN201210523972 A CN 201210523972A CN 103011225 A CN103011225 A CN 103011225A
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Abstract
The invention discloses a carbonization kettle and a method for preparing spherical calcium carbonate by using the carbonization kettle. The carbonization kettle comprises a kettle body, a gas-liquid mixer formed by a plurality of venturi tubes and a high-pressure mud pump. The sizing agent to be carbonized is pumped into a sizing agent annular tube by the high-pressure mud pump, and is injected into the carbonization kettle through liquid inlets of the venturi tubes, under the action of the effect of the venturi tubes, the liquid is quickly jetted, and kiln gas is sucked to be quickly mixed with the sizing agent. Through utilizing the gas-liquid mixer, the kiln gas can be sucked into a reaction kettle without being compressed; meanwhile, kinetic energy generated during quick jetting of the sizing agent forms a powerful whirlpool under the action of a baffle plate of the reaction kettle, so as to enable the gas-liquid mixing to be uniform without mechanical stirring; and after the right amount of sodium silicate is added in the sizing agent, the spherical calcium carbonate can be synthesized.
Description
Technical field
The present invention relates to the calcium carbonate synthesis technical field, especially relate to a kind of Venturi tube effect that utilizes, the method for synthesizing spherical calcium carbonate.
Background technology
The method of existing suitability for industrialized production calcium carbonate superfine powder mainly is to adopt intermittently bubbling stirring-type carburizing reagent still, and kiln gas enters from the bottom of reactor when carbonization, makes gas-liquid mixed generate calcium carbonate superfine powder by mechanical stirring.The kiln gas that this reaction passes into must have certain pressure, only have pressure when kiln gas greater than the static pressure of calcium hydroxide slurry in reactor after, just can make kiln gas be pressed into reactor, mix with calcium hydroxide slurry and react.Increase the pressure of kiln gas, equipment used mainly is air compressor or roots blower at present.Because kiln gas in scavenging process, inevitably also has the impurity such as a small amount of coal tar and coal ash, this impurity causes larger impact to the normal operation of air compressor or roots blower, must often clear up and could realize normal production.When particularly adopting air compressor, the machine oil that is used for lubricated usefulness can be brought product into kiln gas, and the performance of product is also affected.
In general calcium carbonate is synthetic, if do not stir control with temperature during carbonization, can only generate fusiform light calcium carbonate.And for some special application fields, because the good fluidity of spherical calcium carbonate, added value is high, so the synthetic focus that has become people's research of spherical calcium carbonate.
The synthetic of general spherical calcium carbonate is the replacement(metathesis)reaction that adopts calcium chloride solution and yellow soda ash or sal volatile.This reaction production cost is high, and by-product contamination is serious, seldom uses in industrial production at present.
Application number 200910075549.6 has been introduced a kind of preparation and application of spherical calcium carbonate, be with solid carbonic acid calcium under 60-100 ℃, the oven dry of employing injection method, and spray coupling agent and namely get spherical calcium carbonate with polymer pigment dispersant mixing aerosol, what in fact obtain is particulate matter rather than the spherical calcium carbonate primary partical of spherical calcium carbonate.Application number 200410036421.6 has been introduced a kind of preparation method of spherical nanometer calcium carbonate, to adopt high-purity calcium oxide and high-purity carbon dioxide, carry out carbonization by three grades of series connection stirring-type continuous bubbling formula carbonizing plants, and can't satisfy the processing condition of this production for general calcium carbonate factory.Application number 0145312.5 has been introduced preparation and has been had the method for the calcium carbonate of concrete form, is in the reactor of hypergravity, when adding ammoniacal liquor, ammonium class material and hydrogen peroxide, obtains spherical calcium carbonate.Because the calcium carbonate equipment requirements that gravity Method is produced is high, complicated operation, production cost are very high, also can't apply.
Summary of the invention
The object of the invention is to overcome prior art in the production process of calcium carbonate, all kiln gas to be compressed energy consumption large, especially when the bubbling style carburizing reagent of general gap, can't produce the weakness with higher using value spherical calcium carbonate, a kind of carbonization still is provided and use the method that the carbonization still prepares spherical calcium carbonate.
The technical solution used in the present invention is as follows:
A kind of carbonization still comprises that gas liquid mixer and high pressure slurry pump that kettle, a plurality of Venturi tube form form; Described gas mixer is tilted to combine with certain radian by 3-6 Venturi tube, wherein kiln gas ring pipe and Venturi tube kiln gas suction opening link, slurry ring pipe and the import of Venturi tube slurry link, the kiln gas ring pipe links with the kiln gas inlet pipe again, and the slurry ring pipe links with high pressure slurry pump again.
The outlet pipe diameter of described gas liquid mixer is 4-6cm, and slurry ring pipe diameter is 70-80cm, and the inlet pipe diameter is 10cm; Kiln gas ring pipe diameter is 90-100cm, and the inlet pipe diameter is 8cm.
The middle throat diameter of described Venturi tube is 3-4cm, and slurry nozzle mouth diameter is 1.5-2.5cm, and the slurry inlet diameter is 4-6cm, and the kiln gas air entry diameter is 7-8cm.
A kind ofly use the method that the carbonization still prepares spherical calcium carbonate, may further comprise the steps:
(1) unslaked lime is digested with hot water, impurity removal and purification, and be cooled to below 30 ℃, be mixed with the Ca that concentration expressed in percentage by weight is 7.0-10.0% (OH)
2Slurry, stand-by;
(2) to Ca (OH)
2Slurry adds the chemical additives water glass, and add-on is for generating the 2-4% of weight of calcium carbonate;
(3) will contain CO
2Concentration expressed in percentage by volume is after the kiln gas of 25-32% carries out spraying and dedusting, foam dust-removing, to be transported to tubular cooler with gas blower again, is cooled to below 30 ℃ for subsequent use;
(4) with high pressure slurry pump with slurry during by the slurry ring pipe got in the gas liquid mixer, by the import of Venturi tube slurry, spray again and enter the carbonization still, simultaneously under the effect of Venturi tube effect, in the kiln gas ring pipe, form negative pressure, kiln gas is just sucked under normal pressure automatically, spray with slurry and to enter the carbonization still, the kinetic energy when slurry sprays fast is under the effect of reactor plate washer, form powerful whirlpool, do not need mechanical stirring just can make gas-liquid mixed even, when the pH of reaction solution value less than 7, be the carbonization terminal point, thereby finish the mixing carbonization of gas-liquid, synthesizing spherical calcium carbonate.
Advantage of the present invention is:
Utilize this carburizing reagent still, kiln gas just can the sucting reaction still under normal pressure in; Kinetic energy when slurry sprays from nozzle fast drives the slurries rotation, under the effect of reactor plate washer, forms powerful whirlpool, does not need mechanical stirring just can make gas-liquid mixed even; After adding an amount of chemical additives water glass, just can synthesizing spherical calcium carbonate.
Description of drawings
Fig. 1 is for for the carbonization still, and wherein, 1 be gas liquid mixer, and 2 be high pressure slurry pump, and 3 are carbonization slurry suction port, and 4 is the kiln gas inlet pipe, and 5 is the still internal flap, and 6 is the calcium hydroxide slurry entrance, and 7 is carbonization disposed slurry discharge outlet, 8 exhaust ports when being carbonization.
Fig. 2 is gas liquid mixer, and wherein, 1-1 is Venturi tube, and 1-2 is the slurry ring pipe, and 1-3 is the kiln gas ring pipe.
Fig. 3 is the venturi tube structure schematic diagram, and wherein, 1-1-1 is Venturi tube slurry nozzle mouth, and 1-1-2 is the slurry import, and 1-1-3 is the kiln gas suction port.
Embodiment
The kettle diameter 1.5m of carbonization still, high 2.5m; The gas liquid mixer that the kettle bottom is comprised of 4 Venturi, wherein slurry ring pipe diameter is 80cm, the inlet pipe diameter is 8cm; Kiln gas ring pipe diameter is 1m, and the inlet pipe diameter is 10cm; Venturi tube gas-liquid mixed material outlet pipe diameter is 6cm, and throat diameter is 3.5cm in the middle of the Venturi tube, and throat place slurry nozzle mouth diameter is 2cm, and the slurry inlet diameter is 6cm, and the kiln gas air entry diameter is 8cm.
Unslaked lime is digested with hot water, impurity removal and purification, and be cooled to below 30 ℃, be mixed with Ca (OH)
2The concentration expressed in percentage by weight of slurry pumps in the carbonization still between 7.0-10.0%, adds simultaneously the chemical additives water glass and treats carbonization;
After the kiln gas that will contain the CO2 concentration expressed in percentage by volume and be 25-32% carries out spraying and dedusting, foam dust-removing, be transported to tubular cooler with gas blower again, be cooled to below 30 ℃ for subsequent use;
The model of producing with Shijiazhuang is 2PN type slush pump, and flow is 58 cubic metres, and Yang Cheng is 17 meters, and the slurry in the still from suction suitable for reading, is got to the slurry ring pipe of venturi mixer, by the import of Venturi tube slurry, sprays and carries out the carbonization still.Under the effect of Venturi tube effect, the quick jet of liquid sucks kiln gas and slurry short mix in the annular gas pipe, finishes carburizing reagent.
Below in conjunction with embodiment, the invention will be further described, but should be appreciated that these embodiment do not limit the scope of the invention, in the situation that without prejudice to spirit and scope of the invention, those skilled in the art can be to changes and improvements of the present invention so that its different service condition, condition and embodiment.
Adding concentration expressed in percentage by weight in the carbonization still is 3 cubic metres of 8.5% calcium hydroxide slurry, add 8 kilograms of chemical additives water glass, adopt 2PN type slush pump with the slurry in the still from suction suitable for reading, get to the slurry ring pipe of venturi mixer, by the import of Venturi tube slurry, spray again and carry out the carbonization still.Suck simultaneously kiln gas and slurry short mix in the annular gas pipe.Carbonization is about 30% with the concentration expressed in percentage by volume of carbon dioxide in the kiln gas, the temperature of calcium hydroxide slurry is 30 ℃ during initial action, the soakage of kiln gas is 20 cubes m/hs, carburizing reagent is 30-45 ℃, the pH value of 4 hours 10 minutes disposed slurries of carbonization is reduced to below 7.0, is the carbonization terminal point.
Getting slurry after the carbonization, to record shape and appearance of calcium carbonate in the TEM Electronic Speculum be that class is spherical, and particle diameter is at 200-500nm, good dispersity, and without agglomeration.
The method similar to embodiment 1, adding concentration expressed in percentage by weight in the carbonization still is 3 cubic metres of 10% calcium hydroxide slurry, adds 10 kilograms of chemical additives water glass, and carburizing reagent is 28-43 ℃, the pH value of 5 hours 5 minutes disposed slurries of carbonization is reduced to below 7.0, is the carbonization terminal point.
Getting slurry after the carbonization, to record shape and appearance of calcium carbonate in the TEM Electronic Speculum be that class is spherical, and particle diameter is at 200-450nm, good dispersity, and without agglomeration.
The method similar to embodiment 1, adding concentration expressed in percentage by weight in the carbonization still is 3 cubic metres of 7% calcium hydroxide slurry, adds 8 kilograms of chemical additives water glass, and carburizing reagent is 28-39 ℃, the pH value of 3 hours 55 minutes disposed slurries of carbonization is reduced to below 7.0, is the carbonization terminal point.
Getting slurry after the carbonization, to record shape and appearance of calcium carbonate in the TEM Electronic Speculum be that class is spherical, and particle diameter is at 250-500nm, good dispersity, and without agglomeration.
Above demonstration and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.
Claims (4)
1. a carbonization still is characterized in that, comprises that gas liquid mixer and high pressure slurry pump that kettle, a plurality of Venturi tube form form; Described gas mixer is tilted to combine with certain radian by 3-6 Venturi tube, wherein kiln gas ring pipe and Venturi tube kiln gas suction opening link, slurry ring pipe and the import of Venturi tube slurry link, the kiln gas ring pipe links with the kiln gas inlet pipe again, and the slurry ring pipe links with high pressure slurry pump again.
2. carbonization still according to claim 1 is characterized in that, the outlet pipe diameter of described gas liquid mixer is 4-6cm, and slurry ring pipe diameter is 70-80cm, and the inlet pipe diameter is 10cm; Kiln gas ring pipe diameter is 90-100cm, and the inlet pipe diameter is 8cm.
3. carbonization still according to claim 1 is characterized in that, the middle throat diameter of described Venturi tube is 3-4cm, and slurry nozzle mouth diameter is 1.5-2.5cm, and the slurry inlet diameter is 4-6cm, and the kiln gas air entry diameter is 7-8cm.
4. an application rights requires 1 described carbonization still to prepare the method for spherical calcium carbonate, it is characterized in that may further comprise the steps:
(1) unslaked lime is digested with hot water, impurity removal and purification, and be cooled to below 30 ℃, be mixed with the Ca that concentration expressed in percentage by weight is 7.0-10.0% (OH)
2Slurry, stand-by;
(2) to Ca (OH)
2Slurry adds the chemical additives water glass, and add-on is for generating the 2-4% of weight of calcium carbonate;
(3) will contain CO
2Concentration expressed in percentage by volume is after the kiln gas of 25-32% carries out spraying and dedusting, foam dust-removing, to be transported to tubular cooler with gas blower again, is cooled to below 30 ℃ for subsequent use;
(4) with high pressure slurry pump with slurry during by the slurry ring pipe got in the gas liquid mixer, by the import of Venturi tube slurry, spray again and enter the carbonization still, simultaneously under the effect of Venturi tube effect, in the kiln gas ring pipe, form negative pressure, kiln gas is just sucked under normal pressure automatically, spray with slurry and to enter the carbonization still, the kinetic energy when slurry sprays fast is under the effect of reactor plate washer, form powerful whirlpool, do not need mechanical stirring just can make gas-liquid mixed even, when the pH of reaction solution value less than 7, be the carbonization terminal point, thereby finish the mixing carbonization of gas-liquid, synthesizing spherical calcium carbonate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105417567A (en) * | 2015-11-26 | 2016-03-23 | 恩平粤怡化工有限公司 | High-performance nano calcium carbonate producing method applied to silicone adhesive |
| CN107986314A (en) * | 2017-12-27 | 2018-05-04 | 上海碳酸钙厂有限公司 | A kind of preparation method of spherical precipitation calcium carbonate |
| CN109592702A (en) * | 2018-12-29 | 2019-04-09 | 福建贝思科电子材料股份有限公司 | A kind of nano-scale carbon hydrochlorate and preparation method thereof |
| CN111498887A (en) * | 2020-04-22 | 2020-08-07 | 深圳市芭田生态工程股份有限公司 | System and method for producing solid carbonate and solid carbonate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109796035B (en) * | 2019-03-01 | 2021-04-23 | 湖南金箭新材料科技有限公司 | Preparation method of superfine calcium carbonate |
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| 梁锦等: ""碳化参数对纳米碳酸钙粒径与形貌的影响"", 《无机盐工业》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105417567A (en) * | 2015-11-26 | 2016-03-23 | 恩平粤怡化工有限公司 | High-performance nano calcium carbonate producing method applied to silicone adhesive |
| CN107986314A (en) * | 2017-12-27 | 2018-05-04 | 上海碳酸钙厂有限公司 | A kind of preparation method of spherical precipitation calcium carbonate |
| CN109592702A (en) * | 2018-12-29 | 2019-04-09 | 福建贝思科电子材料股份有限公司 | A kind of nano-scale carbon hydrochlorate and preparation method thereof |
| CN111498887A (en) * | 2020-04-22 | 2020-08-07 | 深圳市芭田生态工程股份有限公司 | System and method for producing solid carbonate and solid carbonate |
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Denomination of invention: Carbonation kettle and method for preparing spherical calcium carbonate by using carbonation kettle Effective date of registration: 20220610 Granted publication date: 20160525 Pledgee: Anhui Shitai Rural Commercial Bank Co.,Ltd. Pledgor: CHIZHOU KAIERTE NANO TECHNOLOGY Co.,Ltd. Registration number: Y2022980007427 |