CN113845320B - Plaster of paris and preparation method thereof - Google Patents
Plaster of paris and preparation method thereof Download PDFInfo
- Publication number
- CN113845320B CN113845320B CN202111113544.5A CN202111113544A CN113845320B CN 113845320 B CN113845320 B CN 113845320B CN 202111113544 A CN202111113544 A CN 202111113544A CN 113845320 B CN113845320 B CN 113845320B
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- Prior art keywords
- grinding
- plaster
- paris
- weight
- polyvinyl alcohol
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2623—Polyvinylalcohols; Polyvinylacetates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/52—Grinding aids; Additives added during grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Crushing And Grinding (AREA)
Abstract
A plaster of paris and a method for preparing the same, the method comprising: adding a plaster of paris raw material, a grinding aid and a grinding medium into grinding equipment for grinding to obtain the plaster of paris; the grinding aid contains polyvinyl alcohol, and the addition amount of the polyvinyl alcohol is 0.2-1 part by weight based on 100 parts by weight of the addition amount of the plaster of paris raw material. The preparation method of the plaster of paris is simple to operate, and can obtain high-quality plaster of paris.
Description
Technical Field
The application relates to but is not limited to the field of building materials, in particular to plaster of paris and a preparation method thereof.
Background
Currently, the production of the paper-surface gypsum board mostly uses flue gas desulfurization gypsum as a raw material. The treatment of the desulfurized gypsum comprises dehydration, calcination, ball milling and the like, the dehydration and calcination processes are basically mature, the treatment modes are various, and the ball milling link after calcination is not researched too much. The basic physicochemical properties of desulfurized gypsum vary slightly from one production location to another, and the processes of dehydration and calcination differ slightly. In order to improve the production efficiency, it is necessary to develop a grinding method of desulfurized gypsum suitable for various production sites.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
The application provides plaster and a preparation method thereof, the preparation method is simple to operate, and high-quality plaster can be obtained.
The application provides a preparation method of calcined gypsum, which comprises the following steps: adding a plaster of paris raw material, a grinding aid and a grinding medium into grinding equipment for grinding to obtain the plaster of paris; the grinding aid contains polyvinyl alcohol, and the addition amount of the polyvinyl alcohol is 0.2 to 1 part by weight based on 100 parts by weight of the addition amount of the plaster of paris raw material.
In an embodiment of the present application, the degree of polymerization of the polyvinyl alcohol may be 1700 to 3500.
In embodiments herein, the grinding aid may further comprise at least one of a water reducer and white sugar.
In the embodiment of the application, the grinding aid contains a water reducing agent, and the addition amount of the water reducing agent can be 0.1 to 0.6 parts by weight based on 100 parts by weight of the addition amount of the plaster of paris raw material.
In the examples of the present application, the grinding aid contains white sugar, and the amount of the white sugar added may be 0.2 to 0.5 parts by weight based on 100 parts by weight of the amount of the plaster stone raw material added.
In the embodiment of the application, the rotating speed of the grinding device during grinding can be 20r/min to 24r/min.
In embodiments of the present application, the milling time may be 20mins to 35mins.
In embodiments of the present application, the grinding media may be grinding balls, which may be selected from any one or more of steel balls, alumina ceramic balls, and zirconia ceramic balls.
In embodiments of the present application, the grinding balls may be oval or spherical.
In embodiments herein, the grinding media may be selected from any one or more of spherical grinding balls with diameters of 21mm, 30mm, and 35 mm.
In the examples of the present application, the grinding media comprise spherical balls with diameters of 21mm, 30mm and 35mm, and the weight ratio of the spherical balls with diameters of 21mm, 30mm and 35mm may be (9 to 15): (3 to 9): 1.5 to 7.5).
In embodiments herein, the ratio of the combined weight of the plaster of paris feed and the grinding aid to the weight of the grinding media can be from 1.
The application also provides plaster of paris obtained by the preparation method as described above.
The preparation method of the calcined gypsum is simple to operate, the grinding aid is added, so that the water requirement, the setting time, the specific surface area and the volume weight of the calcined gypsum and the strength of the prepared gypsum test block can reach better values, the energy consumption of ball-milling equipment is reduced to the minimum on the premise of meeting all parameters of clinker, and resources and product preparation cost are saved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides a preparation method of calcined gypsum, which comprises the following steps: adding a plaster of paris raw material, a grinding aid and a grinding medium into grinding equipment for grinding to obtain the plaster of paris; the grinding aid contains polyvinyl alcohol, and the addition amount of the polyvinyl alcohol can be 0.2 to 1 part by weight based on 100 parts by weight of the addition amount of the plaster of paris raw material.
In this application, the term "plaster of Paris raw material" is defined as plaster of Paris that has not been subjected to a grinding treatment, which may be subjected to a dehydration, calcination treatment.
In the examples of the present application, the polyvinyl alcohol may be added in an amount of 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, or 1 part by weight, based on 100 parts by weight of the plaster of paris starting material.
In embodiments of the present application, the plaster of paris feedstock can be desulfurized gypsum clinker.
In an embodiment of the present application, the degree of polymerization of the polyvinyl alcohol may be 1700 to 3500, for example, 1700 to 1800, 1800 to 2000, 2200 to 2500, 2500 to 3000, 3000 to 3500.
In embodiments herein, the degree of alcoholysis of the polyvinyl alcohol can be from 86% to 99%, for example, from 86% to 90%, from 91% to 94%, from 94% to 96%, from 96% to 98%, from 98% to 99%.
In embodiments of the present application, the polyvinyl alcohol may be selected from any one or more of PVA 2488, PVA 2688, PVA 1788.
In embodiments herein, the grinding aid may further comprise at least one of a water reducer and white sugar.
In the examples of the present application, the grinding aid contains a water reducing agent, and the amount of the water reducing agent added may be 0.1 to 0.6 parts by weight, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 parts by weight, based on 100 parts by weight of the amount of the plaster stone raw material added.
In the examples of the present application, the grinding aid contains white sugar, and the amount of the white sugar added may be 0.2 to 0.5 parts by weight, for example, 0.2, 0.3, 0.4, 0.5 parts by weight, based on 100 parts by weight of the plaster stone raw material.
In the embodiment of the application, the water reducing agent can be a water reducing agent for gypsum plasterboards, for example, can be selected from any one or more of polycarboxylic acid water reducing agent and high-efficiency water reducing agent, and further for example, can be selected from any one or two of polycarboxylic acid water reducing agent PCE-11 and high-efficiency water reducing agent FDN-C.
In an embodiment of the present application, the white sugar may be industrial white sugar.
In an embodiment of the present application, the grinding may be ball milling, and the ball milling apparatus is a ball mill.
In the embodiment of the application, the rotating speed of the grinding device during grinding can be 20r/min to 24r/min, for example, 20r/min, 21r/min, 22r/min, 23r/min and 24r/min.
In the examples of the present application, the time for the grinding may be 20mins to 35mins, for example, 20mins, 25mins, 30mins, 35mins.
In embodiments of the present application, the grinding media may be grinding balls, which may be selected from any one or more of steel balls, alumina ceramic balls, and zirconia ceramic balls.
In embodiments of the present application, the grinding balls may be oval or spherical in shape.
In embodiments herein, the grinding media may be selected from any one or more of spherical grinding balls with diameters of 21mm, 30mm, and 35 mm.
In embodiments of the present application, the grinding media may comprise oval spherical alumina ceramic balls and round spherical alumina ceramic balls.
In the examples of the present application, the grinding media comprises three kinds of spherical grinding balls with diameters of 21mm, 30mm and 35mm, and the weight ratio of the spherical grinding balls with diameter of 21mm (phi 21), the spherical grinding balls with diameter of 30mm (phi 30) and the spherical grinding balls with diameter of 35mm (phi 35) can be (9-15): (3-9): (1.5-7.5).
In the examples herein, the ratio of the total weight of the plaster of paris feed and the grinding aid to the weight of the grinding media (i.e., the feed-to-ball ratio) can be from 1 to 2, for example, from 1, 5, 4, 1, 3, 2.
The embodiment of the application also provides plaster of paris, and the plaster of paris is obtained by the preparation method.
Examples and comparative examples
Adding 100 parts by weight of plaster of paris raw material, grinding aid and grinding medium into a ball mill for ball milling to obtain plaster of paris; wherein, the plaster of paris is raw material of desulfurized gypsum clinker, the grinding aid is one or more of water reducing agent, polyvinyl alcohol and industrial white sugar; the plaster of paris starting materials for all examples and comparative examples were from the same batch, except that the process parameters for the ball milling were varied, as shown in tables 1 and 2.
TABLE 1
TABLE 2
Note: the alcoholysis degrees of PVA 2488-100 and PVA 2488-120 are both 88%.
The properties of the plaster of paris prepared in the above examples and comparative examples were tested according to the Chinese national standards GB/T17669.4-1999 determination of physical Properties of clean slurries of building Gypsum, GB/T8074-2008 method for determining the specific surface area of Cement, bo's method, GBT 17669.5-1999 determination of physical Properties of building Gypsum powders, and GBT 17669.3-1999 determination of mechanical Properties of building Gypsum, and the test results are shown in Table 3.
TABLE 3
The experimental results show that the non-ground plaster has low Boehringer specific surface area and poor test block strength, and the grinding aid is added to help the grinding of plaster raw materials, thereby enhancing the performance of plaster.
Comparing example 1 with comparative example 1, it can be seen that the addition of polyvinyl alcohol has a great influence on the performance of the gypsum clinker. Compared with the plaster raw material, the plaster prepared in the embodiment 1 and the comparative example 1 has the advantages that the specific Boehringer surface area of the plaster prepared in the embodiment 1 and the comparative example 1 is increased, the water-paste ratio is reduced, and the breaking strength and the compressive strength are improved by performing ball milling on the plaster raw material through collision friction among substances, but the strength of the prepared plaster can be further improved compared with the comparative example 1 by adding polyvinyl alcohol as a grinding aid in the example 1 during ball milling of the plaster raw material, and the breaking strength of a test block prepared from the plaster is improved by 28.8 percent compared with the comparative example 1.
Comparing examples 1-1, 1-2, 1-3 with comparative example 1 respectively, it can be seen that under the same conditions, the water demand of gypsum can be effectively reduced by the mixed addition of the grinding aid PVA and the PCE-11, and the flexural strength of the test block made of the plaster prepared in example 1-1 is improved by 45.45% compared with that of comparative example 1; under the same conditions, the mixed addition of the grinding aid PVA and the white sugar can increase the grinding aid efficiency and ensure that the clinker has certain viscosity, and the flexural strength of the test block made of the plaster of paris prepared in the examples 1-2 is improved by 34.85 percent compared with the test block made of the plaster of paris prepared in the comparative example 1; the mixing addition of PVA, PCE-11 and white sugar improves the comprehensive performance of the gypsum, such as the obvious improvement of Boehringer's specific surface area, the breaking strength of the gypsum and the like. Experiments show that the enhancement effect of the mixed addition of the grinding aid on the flexural strength of the test block is better than that of the single addition.
Comparing example 2 with example 2-1, it can be seen that under the same conditions of ball milling time and other process parameters, the ball milling speed is low, the friction between the clinker and the ball milling medium and the grinding aid may not be uniform enough, resulting in a lower boehmeria specific surface area of the plaster of paris prepared in example 2-1, and the flexural and compressive strengths of the prepared test blocks are significantly improved relative to the plaster of paris raw material, but are inferior to the plaster of paris prepared in example 2.
Comparing example 4 with example 4-1, it can be seen that under the same other process parameters, the larger the ball ratio, the less the clinker will rub against the ball milling media and the grinding aid, and therefore the somewhat lower the boehmeria specific surface area and the lower the strength of the gypsum briquette.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (9)
1. A preparation method of plaster of paris is characterized by comprising the following steps: adding a plaster of paris raw material, a grinding aid and a grinding medium into grinding equipment for grinding to obtain plaster of paris;
wherein the grinding aid consists of polyvinyl alcohol; or
The grinding aid consists of polyvinyl alcohol and a water reducing agent; or
The grinding aid consists of polyvinyl alcohol and white sugar; or
The grinding aid consists of polyvinyl alcohol, white sugar and a water reducing agent;
the addition amount of the polyvinyl alcohol is 0.2 to 1 part by weight based on 100 parts by weight of the addition amount of the plaster raw material; the addition amount of the water reducing agent is 0.1 to 0.6 weight part; the addition amount of the white sugar is 0.2 to 0.5 weight part.
2. The production method according to claim 1, wherein the degree of polymerization of the polyvinyl alcohol is 1700 to 3500.
3. The production method according to any one of claims 1 to 2, wherein the rotation speed of the grinding apparatus at the time of grinding is 20 to 24r/min.
4. The production method according to any one of claims 1 to 2, wherein the time for the milling is 20 to 35mins.
5. The production method according to any one of claims 1 to 2, wherein the grinding medium is a grinding ball selected from any one or more of a steel ball, an alumina ceramic ball and a zirconia ceramic ball.
6. The method of claim 5, wherein the grinding balls are oval or round balls.
7. The preparation method according to claim 5, wherein the grinding media are selected from any one or more of spherical grinding balls with diameters of 21mm, 30mm and 35 mm;
optionally, the grinding media comprises 21mm, 30mm and 35mm diameter spherical grinding balls, and the weight ratio of 21mm diameter spherical grinding balls, 30mm diameter spherical grinding balls, 35mm diameter spherical grinding balls is (9-15): 3-9): 1.5-7.5.
8. The method of any one of claims 1 to 2, wherein the ratio of the combined weight of the plaster of paris feed and the grinding aid to the weight of the grinding media is from 1 to 6 to 2.
9. Plaster of paris, characterized in that it is obtained by the process of any one of claims 1 to 8.
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| CN202111113544.5A CN113845320B (en) | 2021-09-23 | 2021-09-23 | Plaster of paris and preparation method thereof |
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| CN202111113544.5A CN113845320B (en) | 2021-09-23 | 2021-09-23 | Plaster of paris and preparation method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337779A (en) * | 2008-07-11 | 2009-01-07 | 南京师范大学 | Additive of composite portland cement and producing method thereof |
| CN104176957A (en) * | 2014-08-10 | 2014-12-03 | 安徽锦洋氟化学有限公司 | Method for modifying fluorine gypsum by using redispersible latex powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021259A (en) * | 1972-06-19 | 1977-05-03 | Japan Synthetic Rubber Co., Ltd. | Gypsum composition |
| KR100251445B1 (en) * | 1997-12-08 | 2000-04-15 | 이영환 | Method of manufacturing construction materials having ultraed ray emitting and electromagnetic waves absorpting functions |
| CN1657465A (en) * | 2005-02-04 | 2005-08-24 | 李君先 | Composite cement with less clinker and its production method |
| CN103466978B (en) * | 2013-08-29 | 2015-09-30 | 武汉理工大学 | A kind of preparation method of Phosphogypsum based Gelation Material |
| CN108129045A (en) * | 2017-12-27 | 2018-06-08 | 应城市嘉鸿技术服务科技有限公司 | A kind of preparation method of land plaster |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337779A (en) * | 2008-07-11 | 2009-01-07 | 南京师范大学 | Additive of composite portland cement and producing method thereof |
| CN104176957A (en) * | 2014-08-10 | 2014-12-03 | 安徽锦洋氟化学有限公司 | Method for modifying fluorine gypsum by using redispersible latex powder |
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