CN102167620A - Solid slip casting method for producing attapulgite porous ceramics - Google Patents
Solid slip casting method for producing attapulgite porous ceramics Download PDFInfo
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- CN102167620A CN102167620A CN 201010562455 CN201010562455A CN102167620A CN 102167620 A CN102167620 A CN 102167620A CN 201010562455 CN201010562455 CN 201010562455 CN 201010562455 A CN201010562455 A CN 201010562455A CN 102167620 A CN102167620 A CN 102167620A
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Abstract
The invention discloses a solid slip casting method for producing attapulgite porous ceramics. The main points of the scheme lie in the following steps of: stirring mixed ingredients to be slurry, allowing the slurry to stand, slowly injecting the slurry into a model and a mold core, then oscillating, drying and demoulding, drying, stoving, firing under intermediate temperature, firing under medium-high temperature and firing under high temperature, slowly cooling a fired green body, and packaging the green body to be a finished product of attapulgite porous ceramics. The ingredients of attapulgite porous ceramics solid slip casting method include attapulgite clay, calcined clay, diatomite, plant straw powder, coal grain, superfine polyvinyl alcohol powder, sodium carbonate and water. Porous ceramics products produced by the attapulgite porous ceramics solid slip casting method are characterized by high porosity, little ventilation resistance, controllable aperture, convenient cleaning and regeneration, high-temperature resistance, high-pressure resistance, and chemical mediator corrosion resistance. The solid slip casting method for producing attapulgite porous ceramics is suitable for producing porous ceramics products by the solid slip casting method.
Description
Technical field
The present invention relates to ceramic, be specifically related to a kind of production method of Attapulgite porous ceramics solid casting method.
Background technology
Development along with science and technology and suitability for industrialized production, problems such as the energy, resource, the disposal of three wastes come into one's own more, porous ceramic film material because have that porosity height, air permeance resistance are little, controllable bore diameter, cleaning and regeneration is convenient and characteristics such as high temperature resistant, high pressure, resistant to chemical media corrosion, be used widely in fields such as oil, chemical industry, pharmacy, food, environmental protection and water treatments at present.Especially high-tech sectors such as biochemical industry, fine chemistry industry, energy and material develops rapidly, liquid, solid Research of Separation Technique and exploitation are proposed higher requirement, and high score more and more causes people's attention from the porous filtering technology and the porous ceramics filtering material of precision, high operational efficiency.
The ceramic body that the slip casting method shaping is produced is strict to the specification of quality of mud, the mud that casting is used must have good flowability, thixotropy, stability and perviousness, is guaranteeing under the mobile prerequisite, water ratio is low as far as possible, also requires not contain in the mud bubble.
The mud that the solid casting method is used, its relative density is higher during than drain casting, degree of thickening is higher, the particle fineness of mud is thick slightly, in common ceramic process, be easy to reach above-mentioned condition, but for producing the porous ceramics product, not only require the natural generating portion pore of energy in the base substrate making processes, also to avoid the too high meeting of sintering temperature to make part holes sealing or disappearance, sintering temperature is too low, cause the intensity of ceramic product low, therefore raw and auxiliary material and the production method to porous ceramics has strict requirement, need take into account the void content and the intensity of ceramic product.
Summary of the invention
The objective of the invention is to overcome weak point in the prior art, a kind of production method of Attapulgite porous ceramics solid casting method is provided.
The production method of Attapulgite porous ceramics solid casting method is: will stir to mud after the batch mixes and leave standstill earlier, with vibrate in slow injection model of the mud after leaving standstill and the core rod, dry, the demoulding, drying, oven dry, middle temperature are burnt till, middle high temperature burns till with high temperature and burns till the stage, base substrate after burning till slowly cools off, and is packaged as the finished product of Attapulgite porous ceramics.
The batching of Attapulgite porous ceramics solid casting method is made up of attapulgite clay, ripe flint clay, diatomite, plant stalk powder, coal grain, micronized polyethylene alcohol powder, yellow soda ash and water.
Attapulgite clay be a kind of layer of chain-like structure contain Shuifu County's zeopan clay mineral, crystal is needle-like, fibrous or fiber collection shape because the inner porous of attapulgite clay road, specific surface is big, can reach 500m
2More than/the g, help improving the porosity in the porous ceramic articles.
Attapulgite clay soil property exquisiteness has oily soapy, and light weight, property are crisp, and fracture is conchoidal or irregular shape, and water-absorbent is strong, tool viscosity and plasticity-when wet, and its viscosity can reach more than the 3000mPas, helps the bonding between the starting material; Magnesium oxide in the attapulgite clay can weaken in the ceramic base substrate because the yellow that Fe and Ti compound are produced, and promotes the translucency of porcelain base, improves the physical strength of base substrate.
Attapulgite clay has unique dispersing property, suspension is met dielectric medium and do not produced flocculation sediment, and dry post shrinkage is little, does not produce be full of cracks, and has good, the high temperature resistant and anti-good properties such as saline and alkaline of thixotropy;
Also contain a spot of hydromica, quartz, feldspar, kaolinite, sepiolite and opal in the attapulgite clay, these compositions are used for developing the Attapulgite expensive goods and belong to the impurity class, be to need to get rid of through the screening of purifying, and in the present invention, these compositions are the plasticity-that helps regulating Attapulgite porous china clay in powder, reduce the dry shrinkage of base substrate, shorten time of drying and prevent blank deformation.
Flint clay is the multiple mixture that contains aluminosilicate, main chemical compositions is silicon-dioxide and two kinds of oxide compounds of aluminium sesquioxide, ripe flint clay is that the flint clay raw ore forms after high-temperature calcination, ripe flint clay whiteness and luminosity are good, it is even to have quality, compact structure, volume stability, the refractory temperature high strength is big, in water, be difficult for disperseing, plasticity-is hanged down and characteristics such as water-intake rate is little, ripe in the present invention flint clay is used for improving the content of the aluminium sesquioxide of Attapulgite porous china clay in powder, it is low to avoid into the porcelain temperature, reduce the distortion that porous ceramic articles produces when burning till, can prevent that also porous ceramic articles from producing the atrophy in aperture in sintering process.
Diatomaceous mineral composition mainly is opal and mutation thereof, secondly is clay mineral-hydromica, kaolinite and mineral chip, and quartz, feldspar, biotite and organic matter etc. are arranged in the mineral chip; Diatomite has exquisiteness, loose, light weight, porous, water-absorbent and the strong characteristics of perviousness, helps improving porous ceramic articles mesoporosity rate.
Yellow soda ash is used for that in the present invention Attapulgite porous china clay in powder batching is carried out sodium modification to be handled, and can improve the plasticity-and the adhesive property of Attapulgite porous china clay in powder.
Plant stalk powder is the flour of wearing into after being dried by timber tankage, paddy rice, wheat, rape, seeding corn and other crops straw and accessory substance, be a kind of pore-forming material in the present invention, use Attapulgite porous china clay in powder to make the base substrate of porous ceramics, after the intravital plant stalk powder of base produces the burning volatilization in sintering process, in base substrate, stay less pore.
The coal grain adopts stone coal to pulverize, and is a kind of pore-forming material in the present invention, uses Attapulgite porous china clay in powder to make the base substrate of porous ceramics, after the intravital coal grain of base produces the burning volatilization in sintering process, stays bigger pore in base substrate.
Micronized polyethylene alcohol powder is soluble in water, is a kind of softening agent in the present invention, helps increasing the cohesiveness and the plasticity-of Attapulgite porous china clay in powder.
The present invention is achieved by following technical proposals:
1, the production method of Attapulgite porous ceramics solid casting method is: (1) is stirred after the batch mixes with Attapulgite porous ceramics solid casting method earlier and is mud, and the back mud that stirs need leave standstill 30～80 minutes; (2) in the slow injection model of mud and core rod after will leaving standstill, carry out 1～15 time gentle agitation again, make mud fill the model hole everywhere, and in model, replenish mud successively, mud in the hole all becomes till the blank, the model that is marked with mud is changed over to carry out seasoning in the shed; (3) slowly carry out the demoulding after the mud in the model forms base substrate, the base substrate after the demoulding continues to stay and carries out seasoning in the shed; Base substrate moisture is slowly dried less than changing in the low temperature oven after 15%, and bake out temperature is controlled at 80～150 ℃, and drying time was controlled at 2～4 hours; (4) base substrate after will drying changes in the kiln, temperature is burnt till the stage in being introduced into, firing temperature is controlled at 150～450 ℃, firing time was controlled at 1～4 hour, high temperature burns till the stage in entering again, firing temperature is controlled at 450～950 ℃, firing time was controlled at 1～2 hour, enter high temperature at last and burn till the stage, firing temperature is controlled at 950～1300 ℃, firing time was controlled at 30～60 minutes, and the base substrate after burn till (5) slowly cools off, and was cooled to the finished product that is packaged as the Attapulgite porous ceramics after the room temperature;
The batching of Attapulgite porous ceramics solid casting method is made up of following component by weight percentage: Attapulgite porous china clay in powder 60～80% and water 20～40%;
The production method of described Attapulgite porous china clay in powder is: pulverize in (1) starting material mixing back input pulverizer with Attapulgite porous china clay in powder, the compound particles fineness after the pulverizing is less than 0.15 millimeter; (2) mixture after will pulverizing adds in the fermentation vat water and soaks sodium and be treated to moistening shape mixture, soaks the sodium time to be controlled at 1～10 day; (3) will be pressed into flap in the moistening shape mixture input twin rollers, the thickness of flap is less than 3 millimeters; (4) flap is imported be squeezed into cylindrical strip thing in the vacuum-extruder, the diameter of cylindrical strip thing is controlled at 2～10 millimeters, and (5) are input to the cement threshing ground with cylindrical strip thing and carry out airing, and the cylindrical strip thing water content after the airing is less than 15%; (6) will carry out abrasive dust in the cylindrical strip thing input grinding machine after the airing, particles of powder fineness behind the abrasive dust is less than 0.044 millimeter, (7) will stir in the input stirrer after the batch mixes of Attapulgite porous china clay in powder, the back that stirs is Attapulgite porous china clay in powder;
The raw-material batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: attapulgite clay 45～65%, ripe flint clay 5～35%, diatomite 5～20%, plant stalk powder 2～15% and yellow soda ash 0.1～3%;
The batching that described immersion sodium is handled is made up of following component by weight percentage: mixture 55～75% after the pulverizing and water 25～45%;
The batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: the meal 82～95% behind the abrasive dust, coal grain 2～15% and micronized polyethylene alcohol powder 0.01～3%;
The particle fineness of described plant stalk powder is less than 0.15 millimeter, and the particle fineness of coal grain is less than 0.25 millimeter.
After the starting material of Attapulgite porous china clay in powder are handled, are pressed into flap and are squeezed into bar through the immersion sodium, its internal microstructure is by " bulking ", and form micro-gap and crack, thereby moisture is entered wherein easily, cause microstructural hydration swelling, so that the dispersion of under weak dispersion condition, just can in medium, disintegrating, form viscosity higher, thixotropy also obviously strengthens, can also strengthen the old effect of Attapulgite porous china clay in powder, improve ionic seepage water pressure between the china clay in powder particle, improve the plasticity-of Attapulgite porous china clay in powder.
The production method of Attapulgite porous ceramics solid casting method is that collection pore-creating and gel method are the production method of one, the porous ceramics product that uses Attapulgite porous ceramics solid casting method to produce, the pore volume can reach more than 50% of cumulative volume, have that porosity height, air permeance resistance are little, controllable bore diameter, cleaning and regeneration is convenient and characteristics such as high temperature resistant, high pressure, resistant to chemical media corrosion, the size in porous ceramics product aperture can be adjusted the particle fineness of meal behind the abrasive dust and coal grain as required.
Attapulgite porous china clay in powder has cohesiveness, plasticity-preferably, thixotropy, resistivity against fire and thermostability, have also that shrinking percentage is little, indeformable, intensity is good and the characteristics of quality homogeneous, can guarantee that porous ceramic articles behind the sintering has higher void content and good intensity
The production method of Attapulgite porous ceramics solid casting method is applicable to solid casting method production porous ceramic articles.
Embodiment
The invention will be further described below in conjunction with embodiment:
1, the production method of Attapulgite porous ceramics solid casting method is: (1) is stirred after the batch mixes with Attapulgite porous ceramics solid casting method earlier and is mud, and the back mud that stirs need leave standstill 80 minutes; (2) in the slow injection model of mud after will leaving standstill, treat that mud stops 15 minutes in model after, pour out unnecessary mud, the model that is marked with mud is changed over to carries out seasoning in the shed; (3) slowly carry out the demoulding after the mud in the model forms base substrate, the base substrate after the demoulding continues to stay and carries out seasoning in the shed; Base substrate moisture is slowly dried less than changing in the low temperature oven after 15%, and bake out temperature is controlled at 80～150 ℃, and drying time was controlled at 2 hours; (4) base substrate after will drying changes in the kiln, temperature is burnt till the stage in being introduced into, and firing temperature is controlled at 150～450 ℃, and firing time was controlled at 1 hour, high temperature burns till the stage in entering again, firing temperature is controlled at 450～950 ℃, and firing time was controlled at 1 hour, enters high temperature at last and burns till the stage, firing temperature is controlled at 950～1300 ℃, firing time was controlled at 35 minutes, and the base substrate after burn till (5) slowly cools off, and was cooled to the finished product that is packaged as the Attapulgite porous ceramics after the room temperature;
The batching of Attapulgite porous ceramics solid casting method is made up of following component by weight percentage: Attapulgite porous china clay in powder 65% and water 35%;
The production method of described Attapulgite porous china clay in powder is: pulverize in (1) starting material mixing back input pulverizer with Attapulgite porous china clay in powder, the compound particles fineness after the pulverizing is less than 0.15 millimeter; (2) mixture after will pulverizing adds in the fermentation vat water and soaks sodium and be treated to moistening shape mixture, soaks the sodium time to be controlled at 5 days; (3) will be pressed into flap in the moistening shape mixture input twin rollers, the thickness of flap is less than 3 millimeters; (4) flap is imported be squeezed into cylindrical strip thing in the vacuum-extruder, the diameter of cylindrical strip thing is controlled at 5 millimeters, and (5) are input to the cement threshing ground with cylindrical strip thing and carry out airing, and the cylindrical strip thing water content after the airing is less than 15%; (6) will carry out abrasive dust in the cylindrical strip thing input grinding machine after the airing, particles of powder fineness behind the abrasive dust is less than 0.044 millimeter, (7) will stir in the input stirrer after the batch mixes of Attapulgite porous china clay in powder, the back that stirs is Attapulgite porous china clay in powder;
The raw-material batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: attapulgite clay 63%, ripe flint clay 20%, diatomite 10%, plant stalk powder 5.5% and yellow soda ash 1.5%;
The batching that described immersion sodium is handled is made up of following component by weight percentage: mixture 65% after the pulverizing and water 35%;
The batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: the meal 87% behind the abrasive dust, coal grain 12.5% and micronized polyethylene alcohol powder 0.5%;
The particle fineness of described plant stalk powder is less than 0.10 millimeter, and the particle fineness of coal grain is less than 0.15 millimeter.
Claims (1)
1. the production method of an Attapulgite porous ceramics solid casting method is characterized in that, stirs after the batch mixes of (1) elder generation with Attapulgite porous ceramics solid casting method to be mud, and the back mud that stirs need leave standstill 30～80 minutes; (2) in the slow injection model of mud and core rod after will leaving standstill, carry out 1～15 time gentle agitation again, make mud fill the model hole everywhere, and in model, replenish mud successively, mud in the hole all becomes till the blank, the model that is marked with mud is changed over to carry out seasoning in the shed; (3) slowly carry out the demoulding after the mud in the model forms base substrate, the base substrate after the demoulding continues to stay and carries out seasoning in the shed; Base substrate moisture is slowly dried less than changing in the low temperature oven after 15%, and bake out temperature is controlled at 80～150 ℃, and drying time was controlled at 2～4 hours; (4) base substrate after will drying changes in the kiln, temperature is burnt till the stage in being introduced into, firing temperature is controlled at 150～450 ℃, firing time was controlled at 1～4 hour, high temperature burns till the stage in entering again, firing temperature is controlled at 450～950 ℃, firing time was controlled at 1～2 hour, enter high temperature at last and burn till the stage, firing temperature is controlled at 950～1300 ℃, firing time was controlled at 30～60 minutes, and the base substrate after burn till (5) slowly cools off, and was cooled to the finished product that is packaged as the Attapulgite porous ceramics after the room temperature;
The batching of Attapulgite porous ceramics solid casting method is made up of following component by weight percentage: Attapulgite porous china clay in powder 60～80% and water 20～40%;
The production method of described Attapulgite porous china clay in powder is: pulverize in (1) starting material mixing back input pulverizer with Attapulgite porous china clay in powder, the compound particles fineness after the pulverizing is less than 0.15 millimeter; (2) mixture after will pulverizing adds in the fermentation vat water and soaks sodium and be treated to moistening shape mixture, soaks the sodium time to be controlled at 1～10 day; (3) will be pressed into flap in the moistening shape mixture input twin rollers, the thickness of flap is less than 3 millimeters; (4) flap is imported be squeezed into cylindrical strip thing in the vacuum-extruder, the diameter of cylindrical strip thing is controlled at 2～10 millimeters, and (5) are input to the cement threshing ground with cylindrical strip thing and carry out airing, and the cylindrical strip thing water content after the airing is less than 15%; (6) will carry out abrasive dust in the cylindrical strip thing input grinding machine after the airing, particles of powder fineness behind the abrasive dust is less than 0.044 millimeter, (7) will stir in the input stirrer after the batch mixes of Attapulgite porous china clay in powder, the back that stirs is Attapulgite porous china clay in powder;
The raw-material batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: attapulgite clay 45～65%, ripe flint clay 5～35%, diatomite 5～20%, plant stalk powder 2～15% and yellow soda ash 0.1～3%;
The batching that described immersion sodium is handled is made up of following component by weight percentage: mixture 55～75% after the pulverizing and water 25～45%;
The batching of described Attapulgite porous china clay in powder is made up of following component by weight percentage: the meal 82～95% behind the abrasive dust, coal grain 2～15% and micronized polyethylene alcohol powder 0.01～3%;
The particle fineness of described plant stalk powder is less than 0.15 millimeter, and the particle fineness of coal grain is less than 0.25 millimeter.
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| US7752804B2 (en) * | 2007-02-26 | 2010-07-13 | Profile Products L.L.C. | Porous and non-porous particle reinforcement for viscous hydraulic matrices |
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2010
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005046732A (en) * | 2003-07-29 | 2005-02-24 | Green Japan:Kk | Method for manufacturing phosphorus adsorbent |
| US7752804B2 (en) * | 2007-02-26 | 2010-07-13 | Profile Products L.L.C. | Porous and non-porous particle reinforcement for viscous hydraulic matrices |
| CN101284735A (en) * | 2008-05-16 | 2008-10-15 | 中国科学技术大学 | Porous heat transfer element |
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Application publication date: 20110831 |