CN103524060A - Technique for producing alpha-type semihydrate gypsum powder at low temperature and low pressure - Google Patents
Technique for producing alpha-type semihydrate gypsum powder at low temperature and low pressure Download PDFInfo
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- CN103524060A CN103524060A CN201210226224.5A CN201210226224A CN103524060A CN 103524060 A CN103524060 A CN 103524060A CN 201210226224 A CN201210226224 A CN 201210226224A CN 103524060 A CN103524060 A CN 103524060A
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Abstract
The invention discloses a technique for producing alpha-type semihydrate gypsum powder at a low temperature and a low pressure. The technique comprises the following processing steps: (1) winnowing ore; (2) crushing and coarsely grinding; (3) performing primary steaming and pressing; (4) washing with clear water; (5) performing secondary steaming and pressing; (6) drying by hot air; (7) secondarily grinding, so as to obtain the alpha-type semihydrate gypsum powder. By adopting the technique, the main points of production are put on sub-step crystal transformation of dihydrate gypsum ore at a low temperature and a low pressure, and washing of the ore by clear water by virtue of a wet screening process; a low-temperature and low-pressure long-time steady steam method is adopted in a crystal transformation process; the technique comprises the following processes: removing capping mass and adding mud at an ultra-low temperature and a low pressure during the first stage; washing with clear water, and further evolving during the second stage; carrying out long-time crystal transformation at a low temperature and a low pressure, and carrying out complete chemical reaction during the third stage, so that the transformed alpha-type semihydrate gypsum powder is more regular. Thus, low standard consistency and high strength of the gypsum powder are ensured; the production cost is also greatly reduced in comparison with those of similar products employing the foreign boiled crystal technology.
Description
Technical field
The present invention relates to a kind of processing method of producing α-type semi-hydrated gypsum powder, particularly utilize a kind of method of common dihydrate gypsum ore low-temp low-pressure production α-type semi-hydrated gypsum powder.
Background technology
α high strength gypsum powder is as a kind of gelling material of high-quality, be widely used in the fields such as pottery, precision casting, medical, aviation, boats and ships, automobile, plastics, the art of architecture and industrial art, make various moulds, model, because the superiority of himself performance gains great popularity, social required quantity is very large.Along with economic in recent years fast development, this demand is in continuous increase, and also more and more higher to the quality of alpha gypsum powder and performance requriements.
The plaster of paris is in full Heshui steam or solution, and at certain pressure and temperature, crystal changes, and dihydrate gypsum dehydration generates the α-type semi-hydrated gypsum powder containing l/2 crystal water.At present China produces α high strength semi-hydrated gypsum powder, generally adopts the dewater mode of fine grinding again of dry method steam pressure, and general pressure is at 0.2-0.4MPa, temperature is greater than 200 ℃, and the time is no more than two hours, and gypsum dehydration reaction is very fast, but dihydrate gypsum dehydration is very incomplete, has part dihydrate gypsum.Due to temperature height again wayward, part semi-hydrated gypsum be further dehydrated into dehydrated gyp-, causing the finished product is to take α-type semi-hydrated gypsum as main semi-hydrated gypsum and the mixture of dihydrate gypsum and dehydrated gyp-, causes the product performance index of this explained hereafter unstable.The α-type semi-hydrated gypsum powder technical indicator that common law is produced: standard consistency 53%; 2h folding strength 3.5MPa; Dry folding strength 12MPa; 2h ultimate compression strength: 6MPa; Dry ultimate compression strength: 24MPa; Setting expansion rate < 2%; Water-intake rate 30%.The α-type semi-hydrated gypsum powder technical indicator that the present invention produces is: standard consistency 28%; 2h folding strength 7.5MPa; Dry folding strength: 16MPa; 2h ultimate compression strength: 26MPa; Dry ultimate compression strength: 56MPa; Setting expansion rate: < O.75%; Water-intake rate: 20%.Various extraordinary terra albas comprise as base-material develops successfully to take αsemiwatergypsum: water-proof plaster, precision casting gypsum, dentistry is gypsum, gold jewelry powder, coloured glaze gypsum, plastic uptake gypsum etc. for mould.The object of the invention is to a kind of more simple, energy-conservation method production α-type semi-hydrated gypsum powder.
Summary of the invention
The present invention is a kind of method of low-temp low-pressure production α-type semi-hydrated gypsum powder, employing be common natural dihydrate gypsum ore, purity is greatly about 86% left and right, this ore reserves is large, is generally distributed in the Hebei of China, Henan, Shandong, Shanxi, Hubei, the ground such as Hunan, wherein, the Shuan Bei gypsum mining area, Longyao County, Hebei province at our company place, it is the gypsum mining area of North China maximum, reserves reach 8,000,000,000 tons, and aboundresources is drawn materials conveniently.First ore range estimation is picked up to choosing, then with jaw crusher first level flour, be broken into 10 centimetres of fritters of diameter, put into mesh screen and push autoclave, carry out steam pressure for the first time, Temperature Setting is 125 ℃, pressure setting is 0.1MPa, time is decided to be 4 hours, object is the clay of removing in raw ore, the impurity such as sand, then the clear water that passes into 40 ℃ washs, wash altogether 3 times, object is further to remove to press the impurity spinning off, next carry out steam pressure for the second time, Temperature Setting is 170 ℃, pressure setting is 0.16MPa, time is decided to be 24 hours, this process is the process that the dehydration of dihydrate gypsum ore crystal is converted into semi-hydrated gypsum, also be committed step, after gypsum crystal conversion, directly pass into hot air dries ore, finally enter the fine powder that column mill grinding becomes 200 order left and right, obtain α-type semi-hydrated gypsum powder.
1, a method for low-temp low-pressure production α-type semi-hydrated gypsum powder, is characterized in that dihydrate gypsum ore one-level to pulverize the fritter for 10 centimetres of diameters, puts into autoclave, first pass into steam, setting-up time is four hours, object, pass into afterwards the water washing of 40 ℃, again pass into steam, continue steam pressure 24 hours, transfer αsemiwatergypsum to dihydrate gypsum, pass into warm air, dry, finally carry out grinding to 74 μ m(approximately 200 orders), obtain αsemiwatergypsum powder.
2, it is characterized in that
1. Temperature Setting is 125 ℃ during steam pressure for the first time, and pressure setting is 0.1MPa, and object is to add the impurity such as assorted clay, sand above removing gypsum ore;
2. with 40 ℃ of clear water, wash steam pressure for the first time but do not lose the gypsum ore of crystal water, and with wet screening washing 3 times;
3. Temperature Setting is 170 ℃ during steam pressure for the second time, and pressure setting is 0.16MPa, and at this moment dihydrate gypsum loses 1.5 crystal water in the time of 140-170 ℃, is converted into α-type semi-hydrated gypsum
3, a method for low-temp low-pressure production α-type semi-hydrated gypsum powder, is characterized in that steam pressure mode is simple, does not add any additive, the semi-hydrated gypsum powder crystal formation marshalling of making, and standard consistency is that 25%, two hour anti-folding reaches 7.5MPa.
Embodiment
Below in conjunction with Figure of description, producing and manufacturing technique of the present invention is made to detailed description.
Embodiment 1: common ore is picked up after choosing through range estimation, with jaw crusher, be cut into the fritter of 10 centimetres of left and right of diameter, put into mesh screen and push autoclave, carry out steam pressure for the first time, Temperature Setting is 125 ℃, pressure setting is 0.1MPa, time is set as 4 hours, object is the clay of removing in raw ore, the impurity such as sand, ore after steam pressure for the first time, obviously bleach, adhesion and add assorted surface dust on ore, clay, sand etc. are Automatic-falling all, then the clear water that passes into 40 ℃ washs, wash altogether 3 times, object is further to remove the impurity spinning off, next carry out steam pressure for the second time, Temperature Setting is 170 ℃, pressure setting is 0.16MPa, time is decided to be 24 hours, this process is the process that the dehydration of dihydrate gypsum ore crystal is converted into semi-hydrated gypsum, it is a chemical reaction process, can add crystal modifier, cyanuric acid sodium or maleic anhydride etc., make crystal conversion more completely neat, after gypsum crystal conversion, directly pass into 110 ℃ of hot air dries ores approximately 3 hours, finally enter the fine powder that column mill grinding becomes 200 order left and right, obtain α-type semi-hydrated gypsum powder.
Technical indicator is: standard consistency 28%; 2h folding strength 7.5MPa; Dry folding strength: 16MPa; 2h ultimate compression strength: 26MPa; Dry ultimate compression strength: 56MPa; Setting expansion rate: < O.75%; Water-intake rate: 20%.
Embodiment 2: common ore is picked up after choosing through range estimation, with jaw crusher, be cut into the fritter of 10 centimetres of left and right of diameter, put into mesh screen and push autoclave, carry out steam pressure for the first time, Temperature Setting is 125 ℃, pressure setting is 0.1MPa, time is decided to be 4 hours, object is the clay of removing in raw ore, the impurity such as sand, ore after steam pressure for the first time, color obviously bleaches, adhesion and add assorted surface dust on ore, clay, sand etc. are Automatic-falling all, then the clear water that passes into 40 ℃ washs, wash altogether 3 times, object is further to remove the impurity spinning off, next carry out steam pressure for the second time, Temperature Setting is 160 ℃, pressure setting is 0.1MPa, time is decided to be 20 hours, this process is the process that the dehydration of dihydrate gypsum ore crystal is converted into semi-hydrated gypsum, it is a chemical reaction process, after gypsum crystal conversion, directly pass into 110 ℃ of hot air dries ores approximately 3 hours, finally enter the fine powder that column mill grinding becomes 200 order left and right, obtain α-type semi-hydrated gypsum powder.
Technical indicator is: standard consistency 30%; 2h folding strength 7.5MPa; Dry folding strength: 16MPa; 2h ultimate compression strength: 26MPa; Dry ultimate compression strength: 56MPa; Setting expansion rate: < O.75%; Water-intake rate: 25%.
Accompanying drawing explanation
Accompanying drawing is a kind of process flow sheet of low-temp low-pressure production α-type semi-hydrated gypsum powder.
Claims (3)
1. a processing method for low-temp low-pressure production α-type semi-hydrated gypsum powder, is characterized in that dihydrate gypsum ore one-level to pulverize the fritter for 10 centimetres of diameters, puts into autoclave, first pass into steam, setting-up time is four hours, object, pass into afterwards the water washing of 40 ℃, again pass into steam, continue steam pressure 24 hours, transfer αsemiwatergypsum to dihydrate gypsum, pass into warm air, dry, finally carry out grinding to 74 μ m(approximately 200 orders), obtain αsemiwatergypsum powder.
2. the processing method of a kind of low-temp low-pressure production α-type semi-hydrated gypsum powder according to claim 1, is characterized in that
1. Temperature Setting is 125 ℃ during steam pressure for the first time, and pressure setting is 0.1MPa, and object is to add the impurity such as assorted clay, sand above removing gypsum ore;
2. with 40 ℃ of clear water, wash steam pressure for the first time but do not lose the gypsum ore of crystal water, and with wet screening washing 3 times;
3. Temperature Setting is 170 ℃ during steam pressure for the second time, and pressure setting is 0.16MPa, and at this moment dihydrate gypsum loses 1.5 crystal water at 140-170 ℃, is converted into α-type semi-hydrated gypsum.
3. a processing method for low-temp low-pressure production α-type semi-hydrated gypsum powder, is characterized in that steam pressure mode is simple, does not add any additive, the semi-hydrated gypsum powder crystal formation marshalling of making, and standard consistency is that 25%, two hour wet anti-folding reaches 7.5MPa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964716A (en) * | 2014-04-08 | 2014-08-06 | 湖北大学 | Method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum |
| CN106277874A (en) * | 2016-07-22 | 2017-01-04 | 湖南昌迅科技环保股份有限公司 | A kind of continuous preparation system of α Gypsum Fibrosum |
| CN110482887A (en) * | 2019-09-05 | 2019-11-22 | 襄汾县宏泽石膏粉有限责任公司 | A kind of technique using chemical gypsum production α high strength gypsum powder |
| CN111646767A (en) * | 2020-05-21 | 2020-09-11 | 贵州开磷磷石膏综合利用有限公司 | Application of heat-preservation refractory gypsum powder |
| CN114751667A (en) * | 2022-05-06 | 2022-07-15 | 临澧县达江特种石膏有限公司 | Alpha gypsum production process |
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| CN1362382A (en) * | 2001-01-02 | 2002-08-07 | 曹光华 | Prepn process of high-strength alpha-half hydrated gypsum |
| CN101531477A (en) * | 2009-04-13 | 2009-09-16 | 韩灵翠 | Production method and device of plaster of paris featuring adjustable working pressure |
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2012
- 2012-07-03 CN CN201210226224.5A patent/CN103524060A/en active Pending
Patent Citations (2)
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|---|---|---|---|---|
| CN1362382A (en) * | 2001-01-02 | 2002-08-07 | 曹光华 | Prepn process of high-strength alpha-half hydrated gypsum |
| CN101531477A (en) * | 2009-04-13 | 2009-09-16 | 韩灵翠 | Production method and device of plaster of paris featuring adjustable working pressure |
Non-Patent Citations (1)
| Title |
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| 徐锐等: "烟气脱硫石膏溶液法制备α-半水石膏的工艺研究", 《化学与生物工程》, vol. 28, no. 2, 31 December 2011 (2011-12-31), pages 78 - 80 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964716A (en) * | 2014-04-08 | 2014-08-06 | 湖北大学 | Method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum |
| CN106277874A (en) * | 2016-07-22 | 2017-01-04 | 湖南昌迅科技环保股份有限公司 | A kind of continuous preparation system of α Gypsum Fibrosum |
| CN106277874B (en) * | 2016-07-22 | 2017-10-17 | 湖南昌迅科技环保股份有限公司 | A kind of continuous preparation system of α gypsum |
| CN110482887A (en) * | 2019-09-05 | 2019-11-22 | 襄汾县宏泽石膏粉有限责任公司 | A kind of technique using chemical gypsum production α high strength gypsum powder |
| CN111646767A (en) * | 2020-05-21 | 2020-09-11 | 贵州开磷磷石膏综合利用有限公司 | Application of heat-preservation refractory gypsum powder |
| CN114751667A (en) * | 2022-05-06 | 2022-07-15 | 临澧县达江特种石膏有限公司 | Alpha gypsum production process |
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Application publication date: 20140122 |