CN103011225B - A kind of carbonization still and application carbonization still are prepared the method for spherical calcium carbonate - Google Patents
A kind of carbonization still and application carbonization still are prepared the method for spherical calcium carbonate Download PDFInfo
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- CN103011225B CN103011225B CN201210523972.XA CN201210523972A CN103011225B CN 103011225 B CN103011225 B CN 103011225B CN 201210523972 A CN201210523972 A CN 201210523972A CN 103011225 B CN103011225 B CN 103011225B
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Abstract
The invention discloses a kind of carbonization still and application carbonization still and prepare the method for spherical calcium carbonate. Air and liquid mixer and high pressure slurry pump that this carbonization still is made up of kettle, multiple Venturi tube form. Treat that the slurry of carbonization squeezes into slurry ring pipe by high pressure slurry pump, inject carbonization still by the liquid-inlet of Venturi tube, under the effect of Venturi tube effect, the quick jet of liquid, sucks kiln gas and slurry rapid mixing. Utilize this air and liquid mixer, kiln gas does not need compression with regard in energy sucting reaction still; Kinetic energy when slurry sprays fast simultaneously, under the effect of reactor plate washer, forms powerful whirlpool, does not need mechanical agitation just can make gas-liquid mixed even; In slurry, add after appropriate sodium metasilicate, just can synthesizing spherical calcium carbonate.
Description
Technical field
The present invention relates to calcium carbonate synthesis technical field, especially relate to one and utilize Venturi tube effect, synthesizing sphericalThe method of calcium carbonate.
Background technology
The method of existing suitability for industrialized production calcium carbonate superfine powder is mainly to adopt intermittently bubbling stirring-type carburizing reagent still, at carbonWhen change, kiln gas enters from the bottom of reactor, makes gas-liquid mixed generate calcium carbonate superfine powder by mechanical agitation. This reaction passes intoKiln gas must have certain pressure, and only have and be greater than after the static pressure of calcium hydroxide slurry in reactor when the pressure of kiln gas,Just can make kiln gas be pressed into reactor, mix and react with calcium hydroxide slurry. Increase the pressure of kiln gas, at present device therefor masterIf air compressor or roots blower. Because kiln gas is in purification process, inevitably also have a small amount of coal tar and coalThe impurity such as ash, this impurity causes larger impact to the normal operation of air compressor or roots blower, and often cleaning isCan realize normal production. While particularly adopting air compressor, can bring product into kiln gas for the machine oil of lubricated use, rightThe performance of product also affects.
In general calcium carbonate is synthetic, if does not stir when carbonization and the control of temperature, can only generate fusiformPrecipitated calcium carbonate. And for some special application fields, due to the good fluidity of spherical calcium carbonate, added value is high, so sphericalThe synthetic focus that has become people's research of calcium carbonate.
The synthetic of general spherical calcium carbonate is the metathesis reaction that adopts calcium chloride solution and sodium carbonate or sal volatile.This reaction production cost is high, and by-product contamination is serious, seldom application in industrial production at present.
Application number 200910075549.6 has been introduced a kind of preparation and application of spherical calcium carbonate, is that solid carbonic acid calcium is existedAt 60-100 DEG C, adopt injection method to dry, and spray coupling agent and obtain spherical carbon with polymer pigment dispersant mixing aerosolAcid calcium, what in fact obtain is particle instead of the spherical calcium carbonate primary partical of spherical calcium carbonate. Application number200410036421.6 have introduced a kind of preparation method of spherical nanometer calcium carbonate, are to adopt high-purity calcium oxide and high-purity twoCarbon oxide gas, carries out carbonization by three grades of series connection stirring-type continuous bubbling formula carbonizing plants, and for general calcium carbonate factoryCannot meet the process conditions of this production. Application number 0145312.5 has been introduced the method for preparing the calcium carbonate with concrete form,Be in the reactor of hypergravity, while adding ammoniacal liquor, ammonium class material and hydrogen peroxide, obtain spherical calcium carbonate. Due to gravity MethodThe calcium carbonate equipment requirement of producing is high, complicated operation, and production cost is very high, also cannot 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 will be carried out to compression energyConsumption is large, especially in the time of the bubble type carburizing reagent of general gap, cannot produce and have higher using value spherical calcium carbonateWeakness, provides a kind of carbonization still and application carbonization still to prepare the method for spherical calcium carbonate.
The technical solution used in the present invention is as follows:
A kind of carbonization still, comprises that air and liquid mixer and the high pressure slurry pump of kettle, multiple Venturi tube composition forms; DescribedGas mixer by 3-6 Venturi tube with certain radian tilt combine, wherein kiln gas ring pipe and Venturi tubeKiln gas air entry is connected, and slurry ring pipe and the import of Venturi tube slurry are connected, and kiln gas ring pipe is connected with kiln gas inlet tube again,Slurry ring pipe is connected with high pressure slurry pump again.
The outlet diameter of described air and liquid mixer is 4-6cm, and slurry ring pipe diameter is 70-80cm, inlet tube diameterFor 10cm; Kiln gas ring pipe diameter is 90-100cm, and inlet tube diameter is 8cm.
The middle throat diameter of described Venturi tube is 3-4cm, and slurry nozzle mouth diameter is 1.5-2.5cm, slurry importDiameter is 4-6cm, and kiln gas air entry diameter is 7-8cm.
Apply carbonization still and prepare a method for spherical calcium carbonate, comprise the following steps:
(1) quick lime is digested with hot water, impurity removal and purification, and being cooled to below 30 DEG C, is mixed with concentration expressed in percentage by weight and isThe Ca (OH) of 7.0-10.0%2Slurry, stand-by;
(2) to Ca (OH)2Slurry adds chemical additives sodium metasilicate, and addition is the 2-4% that generates weight of calcium carbonate;
(3) will contain CO2Concentration expressed in percentage by volume is that the kiln gas of 25-32% carries out after spraying and dedusting, foam dust-removing, then with rousingBlower fan is transported to chimney cooler, be cooled to 30 DEG C following for subsequent use;
(4) with high pressure slurry pump by slurry by get in air and liquid mixer slurry ring pipe time, starch by Venturi tubeMaterial import, then spray and enter carbonization still, under the effect of Venturi tube effect, in kiln gas ring pipe, form negative pressure, kiln simultaneouslyGas is just automatically sucked under normal pressure, sprays and enters carbonization still with slurry, and kinetic energy when slurry sprays fast, at reactorUnder the effect of plate washer, form powerful whirlpool, do not need mechanical agitation just can make gas-liquid mixed even, when the pH of reactant liquor value littleIn 7, be carbonization terminal, thereby complete 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 sucting reaction still under normal pressure in; When slurry sprays fast from nozzleKinetic energy drive slurries rotations, under the effect of reactor plate washer, form powerful whirlpool, do not need mechanical agitation just can make gasLiquid mixes; Adding after appropriate chemical additives sodium metasilicate, just can synthesizing spherical calcium carbonate.
Brief description of the drawings
Fig. 1 is for being carbonization still, and wherein, 1 is air and liquid mixer, and 2 is high pressure slurry pump, and 3 is carbonization slurry suction inlet, and 4 areKiln gas inlet tube, 5 is still internal flap, and 6 is calcium hydroxide slurry entrance, and 7 for carbonization disposed slurry floss hole, 8 tail gas during for carbonizationFloss hole.
Fig. 2 is air and liquid mixer, and wherein, 1-1 is Venturi tube, and 1-2 is slurry ring pipe, and 1-3 is kiln gas ring pipe.
Fig. 3 is venturi tube structure schematic diagram, and wherein, 1-1-1 is Venturi tube slurry nozzle mouth, and 1-1-2 is that slurry entersMouthful, 1-1-3 is kiln gas suction inlet.
Detailed description of the invention
The kettle diameter 1.5m of carbonization still, high 2.5m; The air and liquid mixer that kettle bottom is made up of 4 venturi, wherein slurryMaterial ring pipe diameter is 80cm, and inlet tube diameter is 8cm; Kiln gas ring pipe diameter is 1m, and inlet tube diameter is 10cm; Literary composition moundIn pipe gas-liquid mixed material outlet diameter be 6cm, throat diameter is 3.5cm in the middle of Venturi tube, throat's place's slurry nozzle mouth is straightFootpath is 2cm, and slurry inlet diameter is 6cm, and kiln gas air entry diameter is 8cm.
Quick lime is digested with hot water, impurity removal and purification, and be cooled to below 30 DEG C, be mixed with Ca (OH)2The weight of slurryPercentage concentration, between 7.0-10.0%, pumps in carbonization still, adds chemical additives sodium metasilicate to treat carbonization simultaneously;
Be that the kiln gas of 25-32% carries out after spraying and dedusting, foam dust-removing by containing CO2 concentration expressed in percentage by volume, then use air blastBe transported to chimney cooler, be cooled to 30 DEG C following for subsequent use;
With Shijiazhuang produce model be 2PN type slush pump, flow is 58 cubic metres, Yang Cheng is 17 meters, by the slurry in stillMaterial, from suction suitable for reading, is got to the slurry ring pipe of venturi mixer, by the import of Venturi tube slurry, then sprays and carries out carbonizationStill. Under the effect of Venturi tube effect, the quick jet of liquid, sucks kiln gas and slurry rapid mixing in annular gas pipe,Complete carburizing reagent.
Below in conjunction with embodiment, the invention will be further described, but should be appreciated that these embodiment do not limit thisBright scope, without prejudice to spirit and scope of the invention in the situation that, those skilled in the art can be to changes and improvements of the present inventionSo that its different service condition, condition and embodiment.
Embodiment 1
In carbonization still, adding concentration expressed in percentage by weight is 3 cubic metres of 8.5% calcium hydroxide slurry, adds chemical additives silicon8 kilograms, acid sodium, employing 2PN type slush pump from suction suitable for reading, is got to the slurry annular of venturi mixer by the slurry in stillPipe, by the import of Venturi tube slurry, then sprays and carries out carbonization still. The kiln gas and the slurry that suck in annular gas pipe mix simultaneously fastClose. Carbonization is 30% left and right by the concentration expressed in percentage by volume of carbon dioxide in kiln gas, the temperature of calcium hydroxide slurry when initial actionDegree is 30 DEG C, and the soakage of kiln gas is 20 cubes ms/h, and carburizing reagent is 30-45 DEG C, 4 hours 10 minutes disposed slurries of carbonizationPH value reduce to below 7.0, be carbonization terminal.
Getting slurry after carbonization, in TEM Electronic Speculum, to record shape and appearance of calcium carbonate be that class is spherical, and particle diameter, at 200-500nm, dispersesProperty is good, and without agglomeration.
Embodiment 2
The method similar to embodiment 1, in carbonization still, adding concentration expressed in percentage by weight is 3 cubes of 10% calcium hydroxide slurryRice, adds 10 kilograms of chemical additives sodium metasilicate, and carburizing reagent is 28-43 DEG C, and the pH value of 5 hours 5 minutes disposed slurries of carbonization is fallenBe below 7.0, be carbonization terminal.
Getting slurry after carbonization, in TEM Electronic Speculum, to record shape and appearance of calcium carbonate be that class is spherical, and particle diameter, at 200-450nm, dispersesProperty is good, and without agglomeration.
Embodiment 3
The method similar to embodiment 1, in carbonization still, adding concentration expressed in percentage by weight is 3 cubes of 7% calcium hydroxide slurryRice, adds 8 kilograms of chemical additives sodium metasilicate, and carburizing reagent is 28-39 DEG C, and the pH value of 3 hours 55 minutes disposed slurries of carbonization is fallenBe below 7.0, be carbonization terminal.
Getting slurry after carbonization, in TEM Electronic Speculum, to record shape and appearance of calcium carbonate be that class is spherical, and particle diameter, at 250-500nm, dispersesProperty is good, and without agglomeration.
More than show and described general principle of the present invention, principal character and advantage of the present invention. The technology of the industryPersonnel should understand, and the present invention is not restricted to the described embodiments, and the just explanation of describing in above-described embodiment and description originallyThe principle of invention, the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, these changesChange and improve and all fall in the claimed scope of the invention.
Claims (1)
1. apply carbonization still and prepare a method for spherical calcium carbonate, it is characterized in that: described carbonization still, comprises kettle, manyThe air and liquid mixer of individual Venturi tube composition and high pressure slurry pump composition; Described air and liquid mixer by 3-6 Venturi tube withCertain radian tilts to combine, and wherein kiln gas ring pipe and Venturi tube kiln gas air entry are connected, slurry ring pipe and literary compositionIn mound, the import of pipe slurry is connected, and kiln gas ring pipe is connected with kiln gas inlet tube again, and slurry ring pipe is connected with high pressure slurry pump again;Preparation method comprises the following steps:
(1) quick lime is digested with hot water, impurity removal and purification, and be cooled to below 30 DEG C, being mixed with concentration expressed in percentage by weight is 7.0-10.0% Ca (OH)2Slurry, stand-by;
(2) to Ca (OH)2Slurry adds chemical additives sodium metasilicate, and addition is the 2-4% that generates weight of calcium carbonate;
(3) will contain CO2Concentration expressed in percentage by volume is that the kiln gas of 25-32% carries out after spraying and dedusting, foam dust-removing, then uses air blastBe transported to chimney cooler, be cooled to 30 DEG C following for subsequent use;
(4) with high pressure slurry pump, slurry is got to the slurry ring pipe in air and liquid mixer, then enter by Venturi tube slurryMouthful, then spray and enter carbonization still, under the effect of Venturi tube effect, in kiln gas ring pipe, forming negative pressure simultaneously, kiln gas existsUnder normal pressure, just automatically sucked, spray and enter carbonization still with slurry, kinetic energy when slurry sprays fast, at reactor plate washerEffect under, form powerful whirlpool, do not need mechanical agitation just can make gas-liquid mixed even, when the pH of reactant liquor value is less than7, be carbonization terminal, thereby complete the mixing carbonization of gas-liquid, synthesizing spherical calcium carbonate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109796035A (en) * | 2019-03-01 | 2019-05-24 | 燕卓君 | A kind of preparation method of calcium carbonate superfine powder |
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| 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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| "喷射式气-液反应器的型式及应用";汪小伏等;《化学工业与工程技术》;20021231;第23卷(第2期);第36-39页 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109796035A (en) * | 2019-03-01 | 2019-05-24 | 燕卓君 | A kind of preparation method of calcium carbonate superfine powder |
| 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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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 |
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