CN101597079B - Technologic method for producing plastic compression gypsum powder - Google Patents
Technologic method for producing plastic compression gypsum powder Download PDFInfo
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- CN101597079B CN101597079B CN2009100745973A CN200910074597A CN101597079B CN 101597079 B CN101597079 B CN 101597079B CN 2009100745973 A CN2009100745973 A CN 2009100745973A CN 200910074597 A CN200910074597 A CN 200910074597A CN 101597079 B CN101597079 B CN 101597079B
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Abstract
The invention discloses a technologic method for producing plastic compression gypsum powder, including the following steps: (1) ore selection; (2) crushing and grinding; (3) fractional steam pressing and crystal transformation; (4) atmospheric drying; (5) powder selection; (6) adding additive, thus obtaining the plastic compression gypsum powder. The invention takes crystal transformation and crystal arrangement of the gypsum powder as key points and adopts fractional powder steam pressing crystal transformation method in crystal transformation technology: high pressure fast steaming, fast heating and rapid dehydration in a first stage; stable dehydration and humidity eliminating and drying in a second stage; and stabilizing crystalline structure, promoting full crystalline development and final dehydration in a third stage. The method solves conflict of air permeability and water absorbency as well as high strength and high hardness of gypsum mould, fineness, strength and favourable air permeability of the mould are ensured, and the production cost is greatly reduced compared with foreign water boiled crystal transformation technologic products of the same category.
Description
Technical field
The present invention relates to a kind of processing method of producing the plastic compression terra alba.
Background technology
In the making processes of gypsum mold, the ratio of gypsum and water is most important, and the ratio that gypsum accounts for is big more, and the intensity of gypsum mold is high more, and water-absorbent is poor more, otherwise intensity is low more, and water-absorbent is good more.In addition, the crystal shape of terra alba itself is intensity and absorptive the quality factor that influences gypsum mold.The plastic compression terra alba is mainly used in makes plastic pressure forming technology plastic compression mould, is a kind of high-grade gypsum mold material that integrates highly air-permeable, high strength, high rigidity.Plastic pressure forming technology is very harsh to the requirement of gypsum mold: the one, and the requirement plaster mould has high intensity, can bear the above pressure of 6MPa, as for the pressure of large-scale plastic compression machine even can reach 12MPa, if the gypsum mold insufficient strength, very easily fried mould; The 2nd, the requirement plaster mould has high hardness, can bear several thousand frictions of moulded pottery not yet put in a kiln to bake under the environment that absorbs water repeatedly, dewaters, and die surface still will keep certain smooth finish; The 3rd, the requirement plaster mould has high ventilation property and water-absorbent, requires gypsum mold just draining fast under 1 air pressure, and can siphon away the moisture in the moulded pottery not yet put in a kiln to bake in 3 seconds rapidly.And ventilation property, water-absorbent and high strength, high rigidity itself are exactly a pair of contradiction that is difficult to overcome, and ventilation property is high more, the high more then intensity of water-absorbent is low more, and intensity is high more, the high more then density of hardness is high more, will cause ventilation property and absorptive decline.Can this a pair of contradiction is the difficult problem in the plastic compression terra alba triturating just, also be the key point that produce qualified plastic compression terra alba.
Some external plastic compression terra albas all are to change brilliant pure α type gypsum through poach at present, water paste ratio is about 35%, crystal formation is even, present unified columnar arrangement, therefore the hole that forms is also more even, intensity can reach 7MPa, make mould after, smooth surface, the hardness height, ventilative fabulous again, be particularly suitable for the plastic pressure forming technology in the domestic ceramics production, but it is in process of production, in order to solve intensity and absorptive contradiction, reach the particular requirement of plastic compression terra alba, added a series of additive, as crystal modifier, water reducer, expansion inhibitor or the like, the price of these additives is all extremely expensive, and poach changes brilliant technology itself and just greatly improved the cost of producing this kind terra alba, and is therefore external as Britain, the plastic compression terra alba of France is sold for 8000 yuan per ton, and domestic most of domestic ceramics factory is hung back.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the above problems, provide a kind of production cost low, fundamentally solved the processing method of production plastic compression terra alba of the contradiction of gypsum mold intensity and ventilation property.
The present invention produces the processing method of plastic compression terra alba, comprising:
(1), by approach ore dressings such as fragmentations, selection, flushing, reach: crystal ore purity is more than 98%, the purity content of dihydrate gypsum is about 95%, attached water is less than 2%;
(2) crushing grinding: ore is worn into powder, require particle at 180 orders, uniformity coefficient reaches more than 97%;
(3) go into autoclave and steam pressure commentaries on classics crystalline substance step by step, comprise three phases: fs pressure is set at 8 normal atmosphere, 200 ℃ of temperature, steam 1 hour pressure time, subordinate phase adds crystal modifier, pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steam 2 hours pressure time, perhaps, fs adds crystal modifier, 8 normal atmosphere of pressure, 200 ℃ of temperature, steam 2 hours pressure time, subordinate phase pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steam 1 hour pressure time, the phase III dehydrates, and pressure is set at 4 normal atmosphere, 180 ℃ of temperature, 2 hours time;
(4) normal pressure oven dry, 120 ℃ of temperature, 3 hours time, attached water is less than 0.05%;
(5) select powder: the particle more than 99% reaches 180 orders, and other are between 140 orders and 180 orders;
(6) promptly obtain the plastic compression terra alba behind the adding additive.
As another improvement of the present invention, additive is that the multiple additives that is selected from Sodium salts humic acids, polyvinyl alcohol, the benzene emulsion is compound.
As another improvement of the present invention, crystal modifier is a cyanuric acid sodium.
As another improvement of the present invention, additive accounts for the 1-5 ‰ of terra alba consumption.
The present invention is in order to solve gypsum mold ventilation property, water-absorbent and high strength, this a pair of contradiction of high rigidity, intrinsic propesties from terra alba, the one, production is focused on the crystal conversion, crystal arrangement of terra alba, adopt the substep powder to steam and press rotating crystal method, promptly at first ore is worn into powder, carry out substep again and steam pressure, promote to change fully brilliant, water paste ratio is controlled at about 38%.The 2nd, guarantee that the plastic compression terra alba must have higher purity, the content of dihydrate gypsum generally should be about 95%.For reaching the purpose that improves gypsum ore purity, can ore be purified by approach such as fragmentation, selection, flushings, to reduce the influence of impurity to the plastic compression gypsum mold.The 3rd, the fineness and the uniform particles degree of strict control terra alba, add and add the compound physical property of improving of multiple auxiliary material, make any surface finish of gypsum mold, become base attractive in appearance, porous nickel, guaranteed smooth finish, intensity and the high ventilation performance of mould, the external relatively poach of production cost changes brilliant technology like product and reduces by 45%.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Below in conjunction with Fig. 1 producing and manufacturing technique of the present invention being done one describes in detail.
Embodiment 1:
Block transparent dihydrate gypsum is by approach ore dressings such as fragmentation, selection, flushings, reach: crystal ore purity is more than 98%, the purity content of dihydrate gypsum is about 95%, attached water obtains the dihydrate gypsum powder less than 2% through crushing grinding, and powder granule is at 180 orders, uniformity coefficient reaches more than 90%, could guarantee in steaming the pressure process, particulate crystalline form amount of cure uniformity, product property is stable.Defective powder returns mill and grinds again, qualified powder is gone into autoclave and is carried out substep and steam and to press dry drying process, comprise three phases: the fs high pressure steams soon, rapid heating, dehydration rapidly, pressure is set at 200 ℃ of 8 normal atmosphere, temperature, steam 1 hour pressure time, subordinate phase adds cyanuric acid sodium as crystal modifier, and pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steams 2 hours pressure time, stable dehydration, the humidity discharging drying.The phase III dehydration is finished, and pressure is set at 4 normal atmosphere, 180 ℃ of temperature, 2 hours time, promotes the crystalline form zoon, the stable crystalline forms structure.Then the terra alba behind the above-mentioned commentaries on classics crystalline substance is carried out normal pressure oven dry, 120 ℃ of temperature, 3 hours time, to attached water less than 0.05%.Dry after repeatedly select powder, reach uniform particles, the particle more than 99% of strict control product reaches 180 orders, other are between 140 orders and 180 orders, have only crystal formation and particle extremely evenly, terra alba could form neat hole after making mould, guarantees the strong absorptive of mould.Add the resin that accounts for terra alba consumption 1 ‰ subsequently in terra alba, mixing promptly obtains the plastic compression terra alba, adds resin additive and can improve physicals, strengthen intensity, smooth finish and permeability, improve wear resisting property, improve resistance to compression, folding strength, increase the service life.Meet the requirement of domestic ceramics factory plastic pressure forming technology fully through the plastic compression composite gypsum powder of above method production.
After testing, the every index of gypsum of this technology generation is as follows:
Standard consistency: 40% water-intake rate: 50%
The 2H dried folding strength of folding strength: 8.0Mpa: the 14MPa that wets
2H ultimate compression strength: 30MPa does ultimate compression strength: 58Mpa
Ventilation property: 8.6cm
3/ cm
3The MPamin coefficient of expansion: 0.15%
Embodiment 2:
The crystal gypsum ore is by broken, selection, approach ore dressings such as flushing, reach: crystal ore purity is more than 98%, the purity content of dihydrate gypsum is about 95%, attached water is less than 2%, obtain the dihydrate gypsum powder through crushing grinding, powder granule is at 180 orders, uniformity coefficient reaches the qualified powder more than 97%, sending into autoclave carries out substep and steams and to press dry drying process, comprise three phases: the fs high pressure steams soon, adds cyanuric acid sodium as crystal modifier, and pressure is set at 8 normal atmosphere, 200 ℃ of temperature, steam 2 hours pressure time, subordinate phase pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steam 1 hour pressure time.The phase III dehydration is finished, and pressure is set at 4 normal atmosphere, 180 ℃ of temperature, 2 hours time, promotes the crystalline form zoon, the stable crystalline forms structure.Then the terra alba behind the above-mentioned commentaries on classics crystalline substance is carried out normal pressure oven dry, 120 ℃ of temperature, 3 hours time, to attached water less than 0.05%.Dry after repeatedly select powder, the particle more than 99% of strict control product reaches 180 orders, and other are between 140 orders and 180 orders.Add Sodium salts humic acids and the natrium humate mixed additive that accounts for terra alba consumption 5 ‰ subsequently in terra alba, mixing promptly obtains the plastic compression terra alba.
After testing, the every index of gypsum of this technology generation is as follows:
Mark thick: 45% water-intake rate: 50%
The 2H dried folding strength of folding strength: 7.0Mpa: the 14MPa that wets
2H ultimate compression strength: 32MPa does ultimate compression strength: 60Mpa
Ventilation property: 8.7cm
3/ cm
3The MPamin coefficient of expansion: 0.15%
Claims (3)
1. processing method of producing the plastic compression terra alba is characterized in that: comprise following processing step:
(1), by broken, selection, flushing ore dressing, reach: crystal ore purity is more than 98%, and the purity content of dihydrate gypsum is 95%, and attached water is less than 2%;
(2) crushing grinding: ore is worn into powder, require particle at 180 orders, uniformity coefficient reaches more than 97%;
(3) go into autoclave and steam pressure commentaries on classics crystalline substance step by step, comprise three phases: fs pressure is set at 8 normal atmosphere, 200 ℃ of temperature, steam 1 hour pressure time, subordinate phase adds crystal modifier, pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steam 2 hours pressure time, perhaps, fs adds crystal modifier, 8 normal atmosphere of pressure, 200 ℃ of temperature, steam 2 hours pressure time, subordinate phase pressure is set at 6 normal atmosphere, 190 ℃ of temperature, steam 1 hour pressure time, the phase III dehydrates, and pressure is set at 4 normal atmosphere, 180 ℃ of temperature, 2 hours time;
(4) normal pressure oven dry, 120 ℃ of temperature, 3 hours time, attached water is less than 0.05%;
(5) select powder: the particle more than 99% reaches 180 orders, and other are between 140 orders and 180 orders;
(6) promptly obtain the plastic compression terra alba behind the adding additive; It is characterized in that: described crystal modifier is a cyanuric acid sodium.
2. the processing method of production plastic compression terra alba according to claim 1 is characterized in that: described additive is that the multiple additives that is selected from Sodium salts humic acids, polyvinyl alcohol, the benzene emulsion is compound.
3. the processing method of production plastic compression terra alba according to claim 1 and 2 is characterized in that: described additive accounts for the 1-5 ‰ of terra alba consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100745973A CN101597079B (en) | 2009-07-03 | 2009-07-03 | Technologic method for producing plastic compression gypsum powder |
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| CN2009100745973A CN101597079B (en) | 2009-07-03 | 2009-07-03 | Technologic method for producing plastic compression gypsum powder |
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| CN101597079B true CN101597079B (en) | 2011-08-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718461B (en) * | 2012-06-29 | 2013-06-05 | 景德镇陶瓷学院 | Molding process method for preparing gypsum mold by hydrothermal method and product prepared by using method |
| CN106006696B (en) * | 2016-05-12 | 2018-03-13 | 贵州开磷磷石膏综合利用有限公司 | A kind of application of Gypsum Fibrosum micropowder preparation method and the Gypsum Fibrosum micropowder |
| CN107572845A (en) * | 2017-10-11 | 2018-01-12 | 杨朴 | A kind of mould gypsum powder producing method |
| CN107814501A (en) * | 2017-11-26 | 2018-03-20 | 临澧县福鑫源石膏制品有限公司 | A kind of preparation technology of α high strength gypsums powder |
| CN109480415B (en) * | 2018-12-10 | 2022-03-11 | 梦工场珠宝企业管理有限公司 | Jewelry 3D printing molding method |
| CN114751667B (en) * | 2022-05-06 | 2023-02-14 | 临澧县达江特种石膏有限公司 | Alpha gypsum production process |
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