CN104609813A - Ceramic mould preparation gypsum powder and preparation method thereof - Google Patents
Ceramic mould preparation gypsum powder and preparation method thereof Download PDFInfo
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- CN104609813A CN104609813A CN201410786990.6A CN201410786990A CN104609813A CN 104609813 A CN104609813 A CN 104609813A CN 201410786990 A CN201410786990 A CN 201410786990A CN 104609813 A CN104609813 A CN 104609813A
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- terra alba
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Abstract
Ceramic mould preparation gypsum powder includes a main material and an auxiliary material, the main material component includes desulfurization gypsum and citric acid gypsum with the mass ratio of 3:1-5:1; the auxiliary material includes a retarder, calcium sulphate whisker and quick lime, the retarder accounts for 0.01-0.05 % by mass of the main material, the calcium sulfate whisker accounts for 0-2 % by mass of the main material, and the quick lime accounts for 0-2 % by mass of the main material. The preparation method of the ceramic mould preparation gypsum powder is as follows: (1) the desulfurization gypsum and the citric acid gypsum are put into a fluidized bed calcining system for calcining; (2) the calcined main material is ground by grinding equipment; (3) the ground main material is added with the auxiliary materials for modifying. The gypsum powder water absorption rate is high, condensation expansion rate is restrained, and the intensity is high.
Description
Technical field
The present invention relates to terra alba and preparation method thereof, particularly a kind of terra alba for the preparation of ceramic die and preparation method thereof.
Background technology
Injection forming is a kind of ceramic molding of simple, due to plastering have lightweight, production efficiency is high, fire performance good, easy cast, aboundresources, a series of above advantage such as less energy consumption, therefore moulding handicraft, making in dentistry, pottery, machine casting and be used as model plaster to use.Model plaster divides general models gypsum and high strength gypsum two kinds.China accounts for about 15% of China's Production of Ceramics industry for the manufacture of the model plaster of pottery, and ceramic industry is the conventional industries of China, pays close attention to widely so cause, and obtains a large amount of achievements.But in recent years, along with the anxiety of China's daily water-consumption forecasting, make being becoming tight gypsum day of domestic ceramics mould raw material, Gypsum Mine resource quality declines to some extent, gypsum price rises steadily, and the demand of China's domestic ceramics to gypsum is increasing, and this imbalance between supply and demand causes the generally decline of domestic ceramics die quality, add the cost of porcelain product, have impact on the benefit of enterprise.And the industry by-product gypsum being often close on 1.5 hundred million t more and more becomes important gypsum resource, and cause the great attention of country.Industry by-product gypsum is stored up in a large number; both land occupation; waste resource again; the acidity contained and other objectionable impuritiess easily pollute surrounding enviroment; become the important factor of restriction China's coal-firing units gas desulfurization and phosphatic fertilizer company Sustainable development, therefore utilize industry by-product gypsum to national environmental protection and strategy of sustainable development important.
At present, China is used for the mould gypsum powder of forming process of ceramics, by the semi-hydrated gypsum powder of plaster of paris ore processing mostly, gypsum is through aquation, sclerosis forms dihydrate gypsum, the gypsum mold with water-absorbent and some strength is become after drying, and for the production of mould gypsum, though there is certain water-absorbent with the beta-type semi-hydrated gypsum that desulfurated plaster processes, but the high water absorbing capacity also do not reached required by ceramic die, the requirement of low coagulation rate of expansion, current China is not mature enough and perfect to the research improving desulphurization building gypsum goods water-intake rate, many Production of Ceramics enterprises take α, the method of beta-type semi-hydrated gypsum mixing improves its performance, but due to the matching problem of these two kinds of terra albas and the difference of hydrating capacity, still be difficult to produce intensity, water-intake rate and setting expansion rate be ceramic die terra alba all preferably.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the problem that the present invention solves is: the intensity of the ceramic die prepared with former α, beta-type semi-hydrated gypsum is low, water-absorbent is poor, setting expansion rate variance.
For solving the problem of above-mentioned prior art, the present invention adopts following technical scheme:
For the preparation of a terra alba for ceramic die, comprise major ingredient and auxiliary material; The component of major ingredient comprises desulfurated plaster and citric acid gypsum, and described desulfurated plaster and citric acid gypsum mass percent are 3 ︰ 1 ~ 5 ︰ 1; Described auxiliary material comprises retardant, calcium sulfate crystal whiskers and unslaked lime, and wherein retardant accounts for the massfraction of major ingredient is 0.1 ~ 0.5 ‰, and the massfraction that calcium sulfate crystal whiskers accounts for major ingredient is 0 ~ 2%, and the massfraction that unslaked lime accounts for major ingredient is 0 ~ 2%.
Further, described retardant is one or more in Trisodium Citrate, citric acid, gelatine, sodium polyphosphate.
For the preparation of a preparation method for the terra alba of ceramic die, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1); (2) the major ingredient milling equipment after calcining is carried out grinding; (3) add auxiliary material in the major ingredient after grinding and carry out modification.
Further, the calcining temperature of described major ingredient is 150 ~ 160 DEG C.
Further, described grinding time is 10 ~ 30 minutes.
Further, described calcining temperature is regulated by amount of gypsum control methods and heat conduction oil mass control methods.
Further, described churning time is 25 ~ 35 minutes.
Further, described stirring velocity is 58 ~ 62 revs/min.
Beneficial effect of the present invention is:
By desulfurated plaster and these two kinds of industry by-product gypsums of citric acid gypsum by weight percentage 3 ﹕ 1 ~ 5 ﹕ 1 calcine in fluidized bed calcination system.Citric acid gypsum crystal morphology structure in the form of sheets, unit weight is smaller, use with after desulfurated plaster mixed calcining, the unit weight of the major ingredient after calcining is made to reduce on the one hand, improve the pore size distribution$ of the rear major ingredient of calcining on the other hand, so both improve the water-intake rate of goods, also restraining effect is served to the development of setting expansion rate.And the quality of calcining temperature on finished product has extremely important impact, in desulfurated plaster and citric acid gypsum mixed calcining process, control calcining temperature by amount of gypsum control methods and heat conduction oil mass control methods.According to the large object point of fluidization of solid heat transfer coefficient by regulating calcinatory inlet amount can quick adjustment calcining temperature, but regulate the tolerance range of temperature inadequate, but calcining temperature can be controlled between 150 ~ 160 DEG C by as above two kinds of regulating measures, thus avoid the possibility of gypsum generation underburnt or burning effectively, therefore the terra alba excellent performance calcined out, intensity is high.The comprehensive utilization that the present invention is not only industry by-product gypsum opens up a new way, but also solves the poor problem of current domestic domestic ceramics die quality.
Accompanying drawing explanation
Fig. 1 is desulfurated plaster crystal Photomicrograph.
Fig. 2 is citric acid gypsum crystal Photomicrograph.
Embodiment
Below content of the present invention is described in further detail.
For the preparation of a terra alba for ceramic die, comprise major ingredient and auxiliary material.The component of major ingredient comprises desulfurated plaster and citric acid gypsum, and described desulfurated plaster and citric acid gypsum mass percent are 3 ︰ 1 ~ 5 ︰ 1.Auxiliary material comprises retardant, calcium sulfate crystal whiskers and unslaked lime, and wherein retardant accounts for the massfraction of major ingredient is 0.1 ~ 0.5 ‰, and the massfraction that calcium sulfate crystal whiskers accounts for major ingredient is 0 ~ 2%, and the massfraction that unslaked lime accounts for major ingredient is 0 ~ 2%.Can be preferred further, retardant is one or more in Trisodium Citrate, citric acid, gelatine, sodium polyphosphate.Citric acid gypsum crystal morphology structure in the form of sheets, unit weight is smaller, use with after desulfurated plaster mixed calcining, on the one hand the unit weight of goods is reduced, improve the pore size distribution$ of goods on the other hand, so both improve the water-intake rate of goods, also restraining effect is served to the development of setting expansion rate.
For the preparation of a preparation method for the terra alba of ceramic die, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1); (2) the major ingredient milling equipment after calcining is carried out grinding; (3) add auxiliary material in the major ingredient after grinding and carry out modification.The calcining temperature of major ingredient controls between 150 ~ 160 DEG C.Grinding time controlled between 10 ~ 30 minutes.Calcining temperature is regulated by amount of gypsum control methods and heat conduction oil mass control methods.Churning time controlled between 25 ~ 35 minutes.Stirring velocity controls between 58 ~ 62 revs/min.Wherein, gypsum control methods is exactly the operational throughput being controlled desulfurated plaster and citric acid gypsum by material frequency conversion worm conveyor.Heat conduction oil mass control methods is exactly the heat conduction oil mass controlling to enter calcinatory by thermal oil motor-driven control valve.The quality of calcining temperature on described terra alba has extremely important impact, increased the amount of gypsum entering calcinatory time in desulfurated plaster and citric acid gypsum calcination process when temperature drift by material frequency conversion worm conveyor and thermal oil motor-driven control valve respectively and carry out control temperature with the heat conduction oil mass that minimizing enters calcinatory, according to the large object point of fluidization of solid heat transfer coefficient by regulating calcinatory inlet amount can quick adjustment calcining temperature, but regulate the tolerance range of temperature inadequate, can the calcining temperature of major ingredient be controlled between 150 ~ 160 DEG C by as above two kinds of regulating measures, thus avoid the possibility of gypsum generation underburnt or burning effectively, therefore the terra alba excellent performance calcined out.
embodiment one:
By desulfurated plaster and citric acid gypsum by weight percentage 3.5:1 calcine in fluidized bed calcination system, then use milling equipment grinding 10min.By weight, get 98.96 parts, major ingredient powder after grinding, Trisodium Citrate 0.04, unslaked lime 1 part, put into stirrer, churning time 25 minutes, mixing speed 58 revs/min, obtain ceramic die terra alba 100 parts.
embodiment two:
By desulfurated plaster and citric acid gypsum by weight percentage 4:1 calcine in fluidized bed calcination system, then use milling equipment grinding 25min.By weight, get the terra alba after grinding 98.98 parts, citric acid 0.02, calcium sulfate crystal whiskers 1 part, put into stirrer, churning time 30 minutes, mixing speed 60 revs/min, obtain ceramic die terra alba 100 parts.
embodiment three:
By desulfurated plaster and citric acid gypsum by weight percentage 4.5:1 calcine in fluidized bed calcination system, then use milling equipment grinding 15min.By weight, get the terra alba after grinding 98.95 parts, citric acid 0.05, unslaked lime 1 part, put into stirrer, churning time 35 minutes, mixing speed 62 revs/min, obtain ceramic die terra alba 100 parts.
embodiment four:
By desulfurated plaster and citric acid gypsum by weight percentage 5:1 calcine in fluidized bed calcination system, then use milling equipment grinding 20min.By weight, get the terra alba after grinding 98.95 parts, Trisodium Citrate 0.05, calcium sulfate crystal whiskers 1 part, put into stirrer, churning time 30 minutes, mixing speed 60 revs/min, obtain ceramic die terra alba 100 parts.
The ceramic die terra alba that said components prepares, the gypsum detection method that " gypsum building material " of the chief editor such as reference standard QB/T1640-92 " ceramic die gypsum quantitative measurement method " and Chen Yan is mentioned carries out performance test, and test result is in table 1.
Table 1
| Presetting period/min | Final setting time/min | 2h folding strength/MPa | Water-intake rate/% | 2h setting expansion rate/% | |
| Embodiment 1 | 12 | 18 | 3.7 | 40.1 | 0.11 |
| Embodiment 2 | 11 | 19 | 3.9 | 42.5 | 0.1 |
| Embodiment 3 | 11 | 17 | 3.9 | 41.7 | 0.12 |
| Embodiment 4 | 10 | 16 | 4.1 | 43.3 | 0.11 |
As can be drawn from Table 1: the water-intake rate of described terra alba has been up to 43.3%, minimumly also 40.1% is reached, the standard that water-intake rate is very high.The setting expansion rate of 2h suppresses below 0.12%.The folding strength of 2h also reaches more than 3.7MPa, and intensity is high.
Claims (8)
1. prepare a terra alba for ceramic die, it is characterized in that, comprise major ingredient and auxiliary material; The component of major ingredient comprises desulfurated plaster and citric acid gypsum, and described desulfurated plaster and citric acid gypsum mass percent are 3 ︰ 1 ~ 5 ︰ 1; Described auxiliary material comprises retardant, calcium sulfate crystal whiskers and unslaked lime, and wherein retardant accounts for the massfraction of major ingredient is 0.1 ~ 0.5 ‰, and the massfraction that calcium sulfate crystal whiskers accounts for major ingredient is 0 ~ 2%, and the massfraction that unslaked lime accounts for major ingredient is 0 ~ 2%.
2. the terra alba preparing ceramic die according to claim 1, is characterized in that, described retardant is one or more in Trisodium Citrate, citric acid, gelatine, sodium polyphosphate.
3. the preparation method preparing the terra alba of ceramic die according to claim 1, it is characterized in that, step is as follows: desulfurated plaster and citric acid gypsum are put into fluidized bed calcination system and calcined by (1); (2) the major ingredient milling equipment after calcining is carried out grinding; (3) add auxiliary material in the major ingredient after grinding and carry out modification, uniform stirring in stirrer.
4. the preparation method preparing the terra alba of ceramic die according to claim 3, is characterized in that, the calcining temperature of described major ingredient is 150 ~ 160 DEG C.
5. the preparation method preparing the terra alba of ceramic die according to claim 4, is characterized in that, described calcining temperature is regulated by amount of gypsum control methods and heat conduction oil mass control methods.
6. the preparation method preparing the terra alba of ceramic die according to claim 3, is characterized in that, described grinding time is 10 ~ 30 minutes.
7. the preparation method preparing the terra alba of ceramic die according to claim 3, is characterized in that, described churning time is 25 ~ 35 minutes.
8. the preparation method preparing the terra alba of ceramic die according to claim 3, is characterized in that, described stirring velocity is 58 ~ 62 revs/min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254264A (en) * | 2015-09-25 | 2016-01-20 | 钦州学院 | Processing method used for increasing Nixing pottery plaster mold strength |
| CN108191367A (en) * | 2017-12-30 | 2018-06-22 | 应城市嘉鸿技术服务科技有限公司 | A kind of gypsum mold molding gypsum powder |
| CN108975855A (en) * | 2018-09-11 | 2018-12-11 | 界首永恩机电科技有限公司 | A kind of model plaster with good wet strength |
| CN111187050A (en) * | 2018-11-14 | 2020-05-22 | 北新集团建材股份有限公司 | Gypsum board and preparation method thereof |
| CN111747718A (en) * | 2020-07-07 | 2020-10-09 | 酒泉钢铁(集团)有限责任公司 | Modified calcium sulfate hemihydrate whisker reinforced gypsum-based composite material and preparation method thereof |
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| CN101028967A (en) * | 2007-01-26 | 2007-09-05 | 宜兴美地建材有限公司 | Method for producing beta-style half-hydrate gypsum from citric-acid industrial fag end |
| CN101993231A (en) * | 2009-08-19 | 2011-03-30 | 江苏仁和建材科技有限公司 | Method for preparing gypsum powder for ceramic mould by using desulfurized gypsum |
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| CN101028967A (en) * | 2007-01-26 | 2007-09-05 | 宜兴美地建材有限公司 | Method for producing beta-style half-hydrate gypsum from citric-acid industrial fag end |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254264A (en) * | 2015-09-25 | 2016-01-20 | 钦州学院 | Processing method used for increasing Nixing pottery plaster mold strength |
| CN108191367A (en) * | 2017-12-30 | 2018-06-22 | 应城市嘉鸿技术服务科技有限公司 | A kind of gypsum mold molding gypsum powder |
| CN108975855A (en) * | 2018-09-11 | 2018-12-11 | 界首永恩机电科技有限公司 | A kind of model plaster with good wet strength |
| CN111187050A (en) * | 2018-11-14 | 2020-05-22 | 北新集团建材股份有限公司 | Gypsum board and preparation method thereof |
| CN111187050B (en) * | 2018-11-14 | 2021-04-27 | 北新集团建材股份有限公司 | Gypsum board and preparation method thereof |
| CN111747718A (en) * | 2020-07-07 | 2020-10-09 | 酒泉钢铁(集团)有限责任公司 | Modified calcium sulfate hemihydrate whisker reinforced gypsum-based composite material and preparation method thereof |
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Address after: No. 56, Hongli Road, Jiangning Binjiang Development Zone, Jiangning District, Nanjing City, Jiangsu Province 211161 Patentee after: Yifu Technology Co.,Ltd. Address before: No. 56, Hongli Road, Jiangning Binjiang Development Zone, Jiangning District, Nanjing City, Jiangsu Province 211161 Patentee before: JIANGSU EFFUL SCIENCE AND TECHNOLOGY Co.,Ltd. |
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