CN104529206B - A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster - Google Patents
A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster Download PDFInfo
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- CN104529206B CN104529206B CN201410836185.XA CN201410836185A CN104529206B CN 104529206 B CN104529206 B CN 104529206B CN 201410836185 A CN201410836185 A CN 201410836185A CN 104529206 B CN104529206 B CN 104529206B
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- desulfurated plaster
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Abstract
A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster, belongs to anhydrous gypsum technical field。Its implement technique include the choosing of raw material, ball milling, dry, screening, dehydration, centrifugal, dry this series of steps, its key step dehydration carries out in dilute sulfuric acid, the method technique is simple, the cycle is short, energy consumption is low, can be completely removed by the impurity in industry byproduct desulfurated plaster, whiteness significantly improves, it it is the very effective approach of one of desulfurated plaster recycling, simultaneously, there is greatly change in final products composition, the pattern prepared by this technique, significantly different with desulfurated plaster raw material, there is extremely wide Research Prospects。
Description
Technical field
A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster, belong to a kind of improved process of desulfurated plaster, relate to the application technology as the second resource of desulfurated plaster, solve the problems that desulfurated plaster is existing, and prepare a kind of self assembly anhydrous gypsum with great potential using value, belong to anhydrous gypsum technical field。
Background technology
Desulfurated plaster is a kind of industry byproduct, at present, along with coal fired power plant flue gas desulfurization environment-friendly engineering is in the generally enforcement of China, calcium base wet-process flue gas desulfurization technique is adopted in a large number, the annual emissions of desulfurated plaster rapidly increases, although desulfurated plaster is identical with the main component of the natural gypsum, but owing to desulfurated plaster exists significant difference with the natural gypsum in grating, dopant species and water content etc., cause cannot desulfurated plaster being carried out now effective and substantial amounts of recycling。
The domestic resource technology about desulfurated plaster is mainly dinectly bruning and prepares β-semi-hydrated gypsum and directly filled to the improvement being used for salt-soda soil in salt-soda soil at present, but the desulfurated plaster of the overwhelming majority still exists with the form stockpiled and stored, and this occupies land resource greatly and causes the secondary pollution of environment。
Anhydrous gypsum, as the one in Gypsum Fibrosum form, has very big using value, can be used for grit, paint white pigments, paper implant, gas dryer etc., it addition, anhydrous gypsum applies also for the aspect such as agricultural, metallurgy。
Summary of the invention
Preparation method involved in the present invention, it is therefore intended that provide a kind of simple and effective method, directly prepares into the self assembly lamellar anhydrous gypsum with very big Research Significance by this for desulfurated plaster industry byproduct。
The present invention comprises the following steps:
(1) the choosing of raw material: choose desulfurated plaster。
(2) raw material is dry: the desulfurated plaster raw material chosen is sent into drying baker and is dried, and regulates drying baker temperature at 50-60 DEG C, is removed by the free water in raw material；
(3) screening: dried desulfurated plaster raw material is crossed 230 mesh sieves and sieves, removes the impurity that the granule in raw material is bigger；
(4) dehydration: measure appropriate distilled water and sulfuric acid solution, preparation mass concentration is the dilution heat of sulfuric acid of 12%-20%, desulfurated plaster raw material that step (3) processed, a certain amount of adds in the dilution heat of sulfuric acid prepared, be sufficiently stirred for, Homogeneous phase mixing makes slip, and stand a period of time at moderate temperatures so that it is slough water of crystallization；Wherein, during preparation slip, it is preferable that solid-liquid mass ratio controls at 10%-30%, and slip dwell temperature is 75-90 DEG C, and time of repose is 10-30min。
(5) slip is centrifugal: the rotating speed regulating centrifuge is 5000-10000r/min, and centrifugation time is 5-8min, is centrifuged separating to the slip after standing。
(6) dry: to the slip after centrifugal layering, to remove its supernatant, obtain the precipitation of white, taking-up precipitates and puts it into drying baker and is dried, it is thus achieved that final self assembly sheet form gypsum。When precipitation is dried, the temperature of drying baker is controlled at 50-70 DEG C。
The present invention is with a kind of extremely simple effective method, directly this for desulfurated plaster industry byproduct can be prepared into self assembly lamellar anhydrous gypsum, in this preparation process, impurity in desulfurated plaster is removed completely, there is greatly change in the composition of final products and pattern, whiteness significantly improves, and sheet form gypsum self assembly is agglomerate body, lamellar is nano level, has very big Research Significance。
Accompanying drawing illustrates:
The present invention comprises 4 accompanying drawings altogether, is respectively as follows:
Fig. 1: the XRD figure spectrum of desulfurated plaster raw material。
Fig. 2: the SEM collection of illustrative plates of desulfurated plaster raw material。
Fig. 3: the XRD figure spectrum of self assembly sheet form gypsum。
Fig. 4: the SEM collection of illustrative plates of self assembly sheet form gypsum。
Detailed description of the invention:
Each embodiment is that the present invention specifically and is intuitively described below, it is intended in conjunction with accompanying drawing, the present invention is further illustrated, more directly perceived and vivid understanding present disclosure, but the present invention is not limited to following example。
Embodiment 1:
(1) the choosing of raw material: manually choose desulfurated plaster 2g。
(2) raw material is dry: the 2g desulfurated plaster chosen is sent into drying baker, and regulating temperature is 50 DEG C, is removed by the free water in raw material。
(3) screening: dried 2g desulfurated plaster is crossed 230 mesh sieves, removes the impurity that in raw material, granule is bigger。
(4) dehydration: compound concentration is the dilution heat of sulfuric acid of 15%, adds treated 2g desulfurated plaster in the 8ml dilution heat of sulfuric acid prepared, is sufficiently stirred for and prepares into slip, put it into water-bath, the temperature regulating water-bath is 75 DEG C, stands 10min, sloughs water of crystallization。
(5) slip is centrifugal: the rotating speed regulating centrifuge is 5000r/min, the slip centrifugation 10min after insulation being stood。
(6) dry: the slip after centrifugal layering is taken out, remove its supernatant, take out white precipitate, regulating drying baker temperature is 60 DEG C, precipitation is put into drying baker and dries, obtain final products。
Embodiment 2:
(1) the choosing of raw material: manually choose desulfurated plaster 1g。
(2) raw material is dry: the 1g desulfurated plaster chosen is sent into drying baker, and regulating temperature is 60 DEG C, is removed by the free water in raw material。
(3) screening: dried 1g desulfurated plaster is crossed 230 mesh sieves, removes the impurity that in raw material, granule is bigger。
(4) dehydration: compound concentration is the dilution heat of sulfuric acid of 12%, adds treated 2g desulfurated plaster in the 5ml dilution heat of sulfuric acid prepared, is sufficiently stirred for and prepares into slip, put it into water-bath, the temperature regulating water-bath is 80 DEG C, stands 5min, sloughs water of crystallization。
(5) slip is centrifugal: the rotating speed regulating centrifuge is 10000r/min, the slip centrifugation 5min after insulation being stood。
(6) dry: the slip after centrifugal layering is taken out, remove its supernatant, take out white precipitate, regulating drying baker temperature is 50 DEG C, precipitation is put into drying baker and dries, obtain final products。
Embodiment 3:
(1) the choosing of raw material: manually choose desulfurated plaster 3g。
(2) raw material is dry: the 3g desulfurated plaster chosen is sent into drying baker, and regulating temperature is 55 DEG C, is removed by the free water in raw material。
(3) screening: dried 3g desulfurated plaster is crossed 230 mesh sieves, removes the impurity that in raw material, granule is bigger。
(4) dehydration: compound concentration is the dilution heat of sulfuric acid of 20%, adds treated 3g desulfurated plaster in the 10ml dilution heat of sulfuric acid prepared, is sufficiently stirred for and prepares into slip, put it into water-bath, the temperature regulating water-bath is 90 DEG C, stands 5min, sloughs water of crystallization。
(5) slip is centrifugal: the rotating speed regulating centrifuge is 5000r/min, the slip centrifugation 8min after insulation being stood。
(6) dry: the slip after centrifugal layering is taken out, remove its supernatant, take out white precipitate, regulating drying baker temperature is 70 DEG C, precipitation is put into drying baker and dries, obtain final products。
Claims (3)
1. the method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster, it is characterised in that comprise the following steps:
(1) the choosing of raw material: choose desulfurated plaster；
(2) raw material is dry: the desulfurated plaster raw material chosen is sent into drying baker and is dried, and regulates drying baker temperature at 50-60 DEG C, is removed by the free water in raw material；
(3) screening: dried desulfurated plaster raw material is crossed 230 mesh sieves and sieves, removes the impurity that the granule in raw material is bigger；
(4) dehydration: measure appropriate distilled water and sulfuric acid solution, preparation mass concentration is the dilution heat of sulfuric acid of 12%-20%, desulfurated plaster raw material that step (3) processed, a certain amount of adds in the dilution heat of sulfuric acid prepared, be sufficiently stirred for, Homogeneous phase mixing makes slip, and stand a period of time at moderate temperatures so that it is slough water of crystallization；
(5) slip is centrifugal: the rotating speed regulating centrifuge is 5000-10000r/min, and centrifugation time is 5-8min, is centrifuged separating to the slip after standing；
(6) dry: to the slip after centrifugal layering, to remove its supernatant, obtain the precipitation of white, taking-up precipitates and puts it into drying baker and is dried, it is thus achieved that final self assembly sheet form gypsum。
2. according to a kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster of claim 1, it is characterized in that, during step (4) preparation slip, solid-liquid mass ratio controls at 10%-30%, slip dwell temperature is 75-90 DEG C, and time of repose is 10-30min。
3. according to a kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster of claim 1, it is characterised in that when precipitation is dried by step (6), the temperature of drying baker is controlled at 50-70 DEG C。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410836185.XA CN104529206B (en) | 2014-12-28 | 2014-12-28 | A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster |
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| CN201410836185.XA CN104529206B (en) | 2014-12-28 | 2014-12-28 | A kind of method preparing self assembly lamellar anhydrous gypsum based on desulfurated plaster |
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| CN104529206A CN104529206A (en) | 2015-04-22 |
| CN104529206B true CN104529206B (en) | 2016-06-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106801259A (en) * | 2017-01-17 | 2017-06-06 | 辽宁工程技术大学 | A kind of method that mechanical force activating desulfurated plaster prepares calcium sulfate crystal whiskers |
| CN110627103A (en) * | 2018-06-22 | 2019-12-31 | 北新集团建材股份有限公司 | Method for preparing anhydrous calcium sulfate at low temperature |
| CN110629279B (en) * | 2018-06-22 | 2020-12-22 | 北新集团建材股份有限公司 | Self-assembled lamellar anhydrous gypsum single crystal material and preparation method thereof |
| CN108751758A (en) * | 2018-07-16 | 2018-11-06 | 湖北三宁化工股份有限公司 | A kind of technique and device of wet-method dead plaster |
| CN114506872A (en) * | 2022-01-05 | 2022-05-17 | 中国科学院大学 | Method for preparing anhydrous gypsum at normal temperature and pressure |
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| JPS5527860A (en) * | 1978-08-16 | 1980-02-28 | Sumitomo Metal Mining Co Ltd | Production of 2-type anhydrous gypsum |
| US4388292A (en) * | 1981-12-14 | 1983-06-14 | United States Gypsum Company | Process for reducing radioactive contamination in phosphogypsum |
| SG86468A1 (en) * | 2000-05-12 | 2002-02-19 | Yoshino Gypsum Co | Production process of high-purity gypsum |
| CN103396023B (en) * | 2013-07-30 | 2015-11-25 | 湖南恒光科技股份有限公司 | A kind of preparation technology of inactive anhydrous calcium sulfate |
| CN103964483B (en) * | 2014-04-25 | 2016-03-02 | 武汉大学 | A kind of normal pressure solution method prepares the method for high strength gypsum |
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