CN111606587B - Grinding aid adding method - Google Patents
Grinding aid adding method Download PDFInfo
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- CN111606587B CN111606587B CN201910676803.1A CN201910676803A CN111606587B CN 111606587 B CN111606587 B CN 111606587B CN 201910676803 A CN201910676803 A CN 201910676803A CN 111606587 B CN111606587 B CN 111606587B
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- gypsum
- grinding
- grinding aid
- surface area
- specific surface
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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
- C04B11/005—Preparing or treating the raw materials
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The application discloses a grinding aid adding method. The grinding aid adding method comprises the following steps: grinding the raw gypsum material by adopting a set process until the set requirement is met; and adding a grinding aid into the gypsum meeting the set requirement, and continuously grinding by adopting a set process until the gypsum particles reach the target Boehringer specific surface area. The method can improve the grinding efficiency under the condition of not increasing energy consumption, and obtain the gypsum particle coagulant with better coagulation promoting effect.
Description
Technical Field
The application relates to the field of but not limited to building materials, in particular to a grinding aid adding method.
Background
The setting time of gypsum is critical to limiting the line speed of gypsum board production in China, and in order to shorten the setting time, the factory will add finely ground gypsum as a set accelerator. The larger the Boehringer specific surface area and the BET specific surface area of the gypsum particles are, the better the setting accelerating effect is.
In the process of grinding the gypsum, along with the prolonging of the ball milling time, the gypsum particles are gradually thinned, the specific surface energy is increased, and the agglomeration phenomenon is serious. When the refinement and agglomeration of the gypsum particles reach equilibrium, the particle size reaches a steady state without further reduction. At the moment, the gypsum particles can be further refined by increasing the mechanical energy of the powder grinding and adding grinding aids. However, increasing the energy of the pulverizing machine increases the energy consumption although the particle fineness can be increased. The grinding aid is added, so that a single-layer adsorption or steric hindrance effect can be formed on the surfaces of the gypsum particles, agglomeration among fine particles is prevented, balance between particle refinement and agglomeration is destroyed, and the particles are further refined.
Disclosure of Invention
The inventors of the present application found that the grinding efficiency of the raw gypsum particles is low by adding a grinding aid at present. After intensive studies, the inventors of the present application considered the reasons as follows: the existing grinding aid adding mode is that the raw gypsum raw material and the grinding aid are added into a ball mill at the same time; in the initial stage of grinding, the gypsum particles are large, the grinding aid amount required by theoretical adsorption is small, the excessive grinding aid increases the fluidity of materials, and the interaction between a grinding medium and the materials is reduced, so that the efficiency in the initial stage of grinding is reduced.
The application provides a grinding aid adding method which can greatly improve grinding efficiency without increasing energy consumption.
The grinding aid adding method provided by the application comprises the following steps:
grinding the raw gypsum by adopting a set process until the raw gypsum reaches a set requirement; and
and adding a grinding aid into the gypsum meeting the set requirement, and continuously grinding by adopting a set process until the gypsum particles reach the target Boehringer's specific surface area.
In the examples of the present application, the setting requirement may be to achieve 0.2 to 0.9 times the target boehmeria specific surface area for the gypsum particles.
In the examples of the present application, wherein the setting requirement may be to reach 0.6 to 0.80 times the target boehmeria specific surface area for the gypsum particles.
In the examples of the present application, when the production is stable, i.e., the input of raw gypsum material is constant, the timing of the grinding aid addition can be determined according to the boehrlich specific surface area of the raw gypsum particles, e.g., when the raw gypsum particles reach 0.1 to 0.9 times the target boehrlich specific surface area, the grinding aid is added.
In the examples of the present application, when the production is unstable, i.e., the feed amount of raw gypsum material varies, the timing of the grinding aid addition can be determined according to the boehmeria specific surface area of the raw gypsum particles, for example, when the raw gypsum particles reach 0.1 to 0.9 times the target boehmeria specific surface area, the grinding aid is added.
In embodiments herein, the grinding aid may be present in an amount of 1% to 20% by weight of the raw gypsum material.
In an embodiment of the present application, the weight of the grinding aid may be 1% to 15% of the weight of the gypsum raw material.
The grinding aid addition methods of the present application are applicable to grinding aids commonly used in the art, for example, the grinding aid can be selected from any one or more of starch, solid water reducers, sucrose, copolymers of vinyl acetate and ethylene, and other additives used in the industry for grinding aid.
In the embodiment of the application, the grinding equipment can be intermittent equipment, so that the grinding aid can be conveniently controlled to be added.
According to the grinding aid adding method, the raw gypsum is ground for a certain time or ground to a certain Bosch specific surface area, then the grinding aid is added, so that the grinding efficiency cannot be reduced due to the surplus of the grinding aid in the initial grinding stage, the grinding aid is added in the later grinding stage to form single-layer adsorption or steric hindrance effect on the surfaces of the raw gypsum particles, the agglomeration of fine particles is prevented, the balance between the refinement and agglomeration of the raw gypsum particles is destroyed, and the raw gypsum particles with smaller particles and larger specific surface area are obtained.
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 application may be realized and attained by the instrumentalities and methods described in the specification and claims.
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.
Since the active ingredient of the gypsum coagulant is dihydrate gypsum, which begins to slowly release structural water at 65 ℃, the grinding temperature cannot be higher than 65 ℃, and the lower the grinding temperature, the shorter the grinding time, the more beneficial the stability of dihydrate gypsum.
The desulfurized gypsum raw material adopted in the following examples is dried at 40 ℃ to remove attached water before use, and then stored for later use; the ball milling process in the following examples was carried out at room temperature.
Example 1
A six-chamber ball mill used in a production line is taken as ball milling equipment, the equipment parameters are that the diameter is 0.9m and the length is 2m, the weight ratio of balls with three particle sizes is phi 21: phi 30: phi 35 is 7:4:1, the filling rate of a grinding medium is 26%, the rotating speed is 23r/min, and the ball milling time is 40 min; the grinding aid was selected from the solid water reducer FDN-A (supplied by Laiwuhuijiang building materials Co., Ltd.).
A set of blank control data (1#) and four sets of test data (2# to 5#) were made. Number 1 #: adding 50kg of desulfurized gypsum raw material, and measuring the Bosch surface area of 5174.148cm after ball milling for 40min 2 The specific Bosch surface area corresponding to the Bosch surface area is taken as the target Bosch specific surface area; number 2 #: simultaneously adding 50kg of desulfurized gypsum raw material and 0.5kg of solid water reducing agent, and carrying out ball milling for 40 min; number 3 #: adding 50kg of desulfurized gypsum raw material, and ball-milling until the Bosch specific surface area of the desulfurized gypsum raw material is 1000cm 2 About/g, adding 0.5kg of solid water reducing agent, and continuing ball milling until the total time is 40 min; number 4 #: 50kg of desulfurized gypsum raw material is added, and when the mixture is ball-milled until the Brinell specific surface area of the desulfurized gypsum raw material is 3100cm 2 About/g, adding 0.5kg of water reducing agent, and continuing ball milling until the total time is 40 min; number 5 #: 50kg of desulfurized gypsum raw material is added, and when the ball milling is carried out until the Boehringer specific surface area of the desulfurized gypsum raw material is 4600cm 2 About/g, 0.5kg of water reducing agent is added, and ball milling is continued until the total time is 40 min. In the above experiment, the grinding aid was added in an amount of 1% by weight of the desulfurized gypsum raw meal.
The test results of the five experiments are shown in the following table:
it can be seen that the grinding aids are added when the specific Boehringer surface area of the desulfurized gypsum raw material reaches 0.2 times, 0.6 times and 0.9 times of the target specific Boehringer surface area respectively for No. 3, No. 4 and No. 5, and compared with the No. 2 method in which the desulfurized gypsum raw material and the grinding aids are added simultaneously, the material temperature finally obtained for No. 3, No. 4 and No. 5 is lower, so that the grinding aids can be added when the gypsum raw material is ball-milled to reach 0.2 to 0.9 times of the target specific Boehringer surface area, which is beneficial to improving the content of dihydrate gypsum in the coagulant. In 3#, 4#, and 5#, the initial setting time and the final setting time of 4# are shortened more than 2#, and are shortened by 30.2% than the initial setting time of 2# and are shortened by 13.6%, and under the same ball milling time, the boehmeria specific surface area of the gypsum particles obtained from 4# is higher, and is increased by 3.3% than that of 2#, and the material temperature is lower, which shows that the ball milling efficiency of 4# is higher, and the gypsum particles with better accelerating effect can be obtained under the same ball milling time, so that under the experimental conditions, the better grinding aid adding time is realized when the boehmeria specific surface area of the gypsum raw material reaches 0.6 times of the target boehmeria specific surface area.
Example 2
Taking a six-chamber ball mill used in a production line as ball milling equipment, wherein the equipment parameters are that the diameter is 0.9m and the length is 2m, the weight ratio of steel balls with three particle sizes is phi 21: phi 30: phi 35 is 7:4:1, the filling rate of a grinding medium is 26 percent, and the rotating speed is 23 r/min; the grinding aid is selected from starch (edible corn starch, provided by Changchun Dacheng Biotech development Co., Ltd.).
No. 1 desulfurized gypsum raw material 50kg is added, grinding aid is not added, and Boehringer's surface area is 5030cm measured after ball milling for 50min 2 The specific Bosch surface area corresponding to the Bosch surface area is taken as the target Bosch specific surface area; adding 5kg of grinding aid and 50kg of desulfurized gypsum raw material at the same time in No. 2, and ball-milling until the target Boehringer specific surface area is about the same; no. 3 adding 50kg of desulfurized gypsum raw material, grinding desulfurized gypsum raw material until Bosch specific surface area is 2000cm 2 When per gram, 5kg of grinding aid is added, namely the grinding aid is added when the target Boehmeria specific surface area is 0.4 times, and the mixture is ball-milled to a meshStandard boehmeria specific surface area; no. 4 adding 50kg of desulfurized gypsum raw material, grinding desulfurized gypsum raw material until Bosch specific surface area is 3000cm 2 Adding 5kg of grinding aid when the specific surface area is 0.6 times of the target Boehringer specific surface area, and then ball-milling until the specific surface area is the target Boehringer specific surface area; no. 5, 50kg of desulfurized gypsum raw material is added firstly, and the desulfurized gypsum raw material is ground until the Boehringer's specific surface area is 4000cm 2 And when the specific surface area per gram is determined, adding 5kg of grinding aid, namely adding the grinding aid when the specific surface area per gram is 0.8 times of the target specific Boehringer surface area, and then carrying out ball milling until the specific surface area per gram is the target specific Boehringer surface area. In the above experiment, the grinding aid was added in an amount of 10% by weight of the desulfurized gypsum raw meal. Inspecting raw material powder grinding until Bo's specific surface area is 5000cm 2 The time and material temperature used in/g and the results are shown in the table below.
It can be seen that, in order to achieve the same target boehrliche specific surface area, compared with the simultaneous addition of desulfurized gypsum raw material and grinding aid, the time for adding grinding aid is shorter when the desulfurized gypsum raw material is ball-milled to the target boehrliche specific surface area of 0.4-0.8 times, and the material temperature of the finally obtained raw gypsum particles is lower, which indicates that the ball-milling efficiency and the content of dihydrate gypsum in the raw gypsum coagulant can be improved by adding grinding aid when the target boehrliche specific surface area of 0.4-0.8 times; moreover, the ball milling efficiency is higher when the grinding aid is added at the target Boehringer specific surface area of 0.6 times, and the material temperature finally obtained when the grinding aid is added at the target Boehringer specific surface area of 0.8 times is lower.
Example 3
Ball milling with a star type ball mill of QXQM-2 at 600r/min, wherein the ball mill has 4 ball milling tanks, one ball milling tank is No. 0, 120g agate balls and 140g desulfurized gypsum raw material are placed in the ball milling tank, and the Boehringer specific surface area of the desulfurized gypsum raw material is 900cm 2 The specific Boehringer's surface area is 4077.148cm when measured by ball milling for 2h 2 (ii)/g as target Boehringer's specific surface area; then 120g of the same agate balls are placed in 4 ball milling tanks numbered A, B, C, D, and desulfurized gypsum raw material is addedBall milling was performed under the same conditions. The grinding aid is selected from starch (edible corn starch, provided by Changchun Dacheng Biotech development Co., Ltd.).
Before ball milling, 140g of desulfurized gypsum raw material and 21g of starch are put into a tank A, and ball milling is carried out for 2 hours; 140g of desulfurized gypsum raw material is placed into a tank B before ball milling, and when the Brinell specific surface area of the desulfurized gypsum raw material is 1600cm 2 When the volume is about one gram, 21 grams of starch is added and the ball milling is continued for 2 hours; 140g of desulfurized gypsum raw material is placed into a C tank before ball milling, and when the Boehringer's specific surface area of the desulfurized gypsum raw material is 2000cm 2 After about/g, adding 21g of starch and continuing to perform ball milling for 2 hours; 140g of desulfurized gypsum raw material is put into a tank D before ball milling, and when the Boehringer specific surface area of the desulfurized gypsum raw material is 3200cm 2 After about/g, 21g of starch was added and the ball milling was continued for 2 h. In the above experiment, the grinding aid was added in an amount of 15% by weight of the desulfurized gypsum raw meal. The test results of the five experiments are shown in the following table:
it can be seen that B, C, D grinding aids are added when the specific Boehringer surface area of the desulfurized gypsum raw material reaches 0.4 times, 0.6 times and 0.8 times of the target specific Boehringer surface area, respectively, and compared with A in which the desulfurized gypsum raw material and the grinding aids are added simultaneously, the material temperature finally obtained by B, C, D is lower, so that the grinding aids can be added when the gypsum raw material is ball-milled to 0.4 to 0.8 times of the target specific Boehringer surface area, which is beneficial to increasing the content of dihydrate gypsum in the coagulant. In B, C, D, the initial setting time and final setting time of D were relatively shortened more, 21.7% shorter than those of A, the final setting time was 13.0% shorter, and D gave gypsum particles with lower temperature, indicating that D gave gypsum particles with better set-accelerating effect at the same ball milling time. Therefore, under the experimental conditions, the better grinding aid adding time is when the Boehringer specific surface area of the gypsum raw material reaches 0.8 times of the target Boehringer specific surface area.
As can be seen from examples 1-3, the addition of the gypsum raw material first and then the grinding aid is better than the simultaneous addition of the gypsum raw material and the grinding aid. And when the addition amount of the grinding aid is in the range of 1-15% of the total addition amount of the gypsum raw material and the grinding aid, and the larger the addition amount of the grinding aid is, the better the addition time of the grinding aid is closer to the target Boehmeria specific surface area.
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 (5)
1. A grinding aid addition method comprising:
grinding the raw gypsum by adopting a set process until the raw gypsum reaches a set requirement; and
adding grinding aid into the gypsum meeting the set requirement, continuously adopting the set process for grinding until the gypsum particles reach the target Boehringer specific surface area,
wherein the setting requires that the gypsum particles reach 0.6-0.8 times of the target Boehringer specific surface area.
2. The method of claim 1, wherein the dosage of the raw gypsum material is fixed or variable during the continuous dosing.
3. The method of any of claims 1-2, wherein the grinding aid is present in an amount of 1% to 20% by weight of the raw gypsum material.
4. The method of claim 3, wherein the grinding aid is present in an amount of 1% to 15% by weight of the raw gypsum material.
5. The method of any one of claims 1-2, wherein the grinding aid is selected from any one or more of starch, a solid water reducer, sucrose, and a copolymer of vinyl acetate and ethylene.
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| CN113579861A (en) * | 2021-07-05 | 2021-11-02 | 广东风华高新科技股份有限公司 | Chamfering method of LTCC chip type ceramic filter |
| CN116046618B (en) * | 2023-02-27 | 2024-02-27 | 一夫科技股份有限公司 | Grinding fineness monitoring method and system for superfine calcium sulfate |
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| CN109759212A (en) * | 2019-01-23 | 2019-05-17 | 宁波北新建材有限公司 | A kind of preparation facilities preparing coagulant using waste gypsum plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3573947A (en) * | 1968-08-19 | 1971-04-06 | United States Gypsum Co | Accelerator for gypsum plaster |
| CN110467369B (en) * | 2018-05-10 | 2021-11-16 | 北新建材（嘉兴）有限公司 | Gypsum coagulant, preparation method thereof and paper-faced gypsum board |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108002721A (en) * | 2017-11-08 | 2018-05-08 | 马鞍山豹龙新型建材有限公司 | A kind of method that activating coal gangue prepares high-activity gelled material |
| CN108002720A (en) * | 2017-11-08 | 2018-05-08 | 马鞍山豹龙新型建材有限公司 | A kind of preparation method of high activity superfine graining slag micropowder |
| CN109759212A (en) * | 2019-01-23 | 2019-05-17 | 宁波北新建材有限公司 | A kind of preparation facilities preparing coagulant using waste gypsum plate |
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