CN111606592A

CN111606592A - Preparation method of gypsum board coagulant and gypsum board coagulant prepared by preparation method

Info

Publication number: CN111606592A
Application number: CN201910344412.XA
Authority: CN
Inventors: 丛宇; 李帆; 戚婷婷; 张赫
Original assignee: China National Building Materials Innovation and Technology Research Institute Co Ltd
Current assignee: China National Building Materials Innovation and Technology Research Institute Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-09-01

Abstract

The application discloses a preparation method of gypsum board coagulant, wherein the raw material of the coagulant is waste material generated in the production of gypsum boards, and the waste material is fed into an impact mill to be crushed to prepare the gypsum board coagulant. The application also discloses the use of the gypsum board set accelerator prepared by the preparation method of the gypsum board set accelerator in gypsum boards. By adopting the preparation method of the gypsum board coagulant provided by the application, the waste is used as the raw material of the coagulant, so that the waste is recycled, the cost is saved, the benefit is brought to a factory, and the gypsum board coagulant also meets the requirements of environmental protection; the gypsum board coagulant prepared by the impact mill has smaller volume weight and particle size distribution and larger specific surface area, so that the coagulant has better coagulation accelerating effect to meet the production requirement.

Description

Preparation method of gypsum board coagulant and gypsum board coagulant prepared by preparation method

Technical Field

The application relates to but is not limited to the technical field of novel building materials, and particularly relates to a preparation method of a gypsum board coagulant and the gypsum board coagulant prepared by the preparation method.

Background

When the paper-surface gypsum board is produced, the setting time of the desulfurized gypsum is not required, and a coagulant is required to be added in a factory to set the desulfurized gypsum as soon as possible so as to meet the production requirement. At present, there are several coagulants available for factory selection, such as potassium sulfate, waste plates from ball milling or scrap, which have some coagulation promoting effects but also have some disadvantages. If the potassium sulfate is excessively mixed, a large amount of potassium ions can be introduced, so that the gypsum board is low in strength and poor in bonding performance; and contain many wastepapers in the flitch or leftover bits, can influence the crushing effect of ball mill, and then disturb the stability of gypsum board production, can reduce the compressive strength of gypsum board even.

Disclosure of Invention

In order to solve at least one of the technical problems, the invention provides a preparation method of a gypsum board accelerator, which uses waste as a raw material of the accelerator, realizes the recycling of the waste, saves the cost, brings benefits to factories, and meets the requirements of environmental protection; the gypsum board coagulant prepared by the impact mill has smaller volume weight and particle size and larger specific surface area, so that the coagulant has better coagulation accelerating effect to meet the production requirement.

The invention provides a preparation method of a gypsum board coagulant, wherein the raw material of the coagulant is waste material generated in the production of gypsum boards, and the waste material is sent into an impact mill to be crushed to prepare the gypsum board coagulant.

Optionally, the water content of the waste material is less than 1 wt%.

Optionally, the impact mill has a feed rate of 2kg to 20 kg.

Optionally, the impact mill operates at a frequency of 5Hz to 30 Hz.

Optionally, the impact mill is one or both of a vertical impact mill and a horizontal impact mill.

Optionally, the waste material is one or both of production waste board and three control waste board.

Optionally, one or both of the production waste sheet and the three control waste sheet comprises fibrous impurities.

Optionally, the fibrous impurities are waste paper.

Optionally, the impurity content of the production waste plate and the three-control waste plate is 5 wt% to 20 wt%.

The present application also provides gypsum board set accelerators prepared using the above-described methods of preparation.

Alternatively, the specific Boehringer surface area of the setting accelerator for plasterboards is 500m²/g～5000m²/g。

After the technical scheme is adopted, the invention has the following beneficial effects:

according to the preparation method of the gypsum board coagulant provided by the invention, the waste is used as the raw material of the coagulant, so that the waste is recycled, the cost is saved, the benefit is brought to a factory, and the gypsum board coagulant meets the requirements of environmental protection.

The gypsum board coagulant is prepared by adopting the impact mill, is simple to operate, short in crushing time, free of grinding aid, not easy to block and not influenced by paper scraps.

The gypsum board coagulant prepared by the impact mill has smaller volume weight and particle size distribution, larger specific surface area, shorter time for gypsum board coagulation, better coagulation accelerating effect and capability of improving the strength of the gypsum board to a certain extent so as to meet the production requirement.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

FIG. 1 is a graph of the particle size distribution of the gypsum board set accelerator obtained in examples 1-6.

Detailed Description

Embodiments of the present application are described below by way of examples, and it should be appreciated by those skilled in the art that these specific examples merely illustrate selected embodiments for achieving the purposes of the present application and are not intended to limit the technical solutions. Modifications of the technical solutions of the present application in combination with the prior art are obvious from the teachings of the present application and fall within the protection scope of the present application.

The set of accelerators used in the following examples are waste boards from the manufacture of gypsum board, and the application is further described with reference to specific examples.

Examples 1 to 6

Gypsum board set accelerators were prepared from the waste boards having a moisture content and impurity content as provided in table 1, using equipment feed rates and operating frequencies set forth in table 1, wherein examples 1-3 and comparative examples 2-3 used a vertical impact mill model CSM410-V, manufactured by elpai, and comparative example 1 used a planetary ball mill model QXQM-2.

TABLE 1

Performance testing

1. The gypsum board set accelerators prepared in the above examples and comparative examples were used to test the volume weight and the specific surface area thereof, the specific surface area of the set accelerator was measured by means of a Boehringer specific surface area meter, and the volume weight was measured as follows:

the volume weight test method comprises the following steps: the set accelerator for gypsum boards of the examples and comparative examples was placed at a fixed volume V and mass m₁In the container (2), the coagulant is allowed to naturally pile up the whole container, and the mass of the coagulant is weighed as m₂The volume weight of the gypsum board set accelerator in the examples and comparative examples was calculated using the following formula: g ═ m₂-m₁) V, test results are given in table 2:

TABLE 2

Numbering	Volume weight (kg/m)³)	Specific surface area (m)²/g)
			Example 1	351	1028.0
Example 2	365	987.9
			Example 3	496	932.4
Comparative example 1	605	763.9
			Comparative example 2	511	669.1
Comparative example 3	567	777.9

From the experimental data in Table 2, it is understood that the gypsum board setting accelerator prepared by using the impact mill as a raw material in example 1 has a smaller volume weight and a larger Bosch's specific surface area than the gypsum board setting accelerator prepared by using the ball mill, as compared with comparative example 1. Example 2 compared to comparative example 2, the lower the moisture content of the waste board, the lower the bulk weight and the greater the specific Bosch surface area, were also used in the preparation of gypsum board set accelerators using an impact mill. Example 3 in comparison with comparative example 3, the same impact mill was used to prepare a gypsum board set accelerator, the higher the level of waste board impurities, the lower the bulk density and the greater the specific Bosch surface area.

2. The gypsum board set accelerators prepared in the above examples and comparative examples were tested for particle size distribution using a Malvern laser particle sizer (Malvern Instruments) and tested by dry method in the range of 0.01 μm to 3500 μm, with the results shown in table 3:

TABLE 3

The data of table 3 were plotted to obtain a particle size distribution plot, as shown in fig. 1.

As can be seen from the experimental data in table 3 and fig. 1, the particle size distribution of the gypsum board accelerator prepared by using the impact mill using the waste board as the raw material is smaller than that of the gypsum board accelerator prepared by using the ball mill in example 1 as compared with comparative example 1. Examples 1-3 compared to comparative examples 2-3, the same impact mill was used to prepare a set accelerator for gypsum board, the lower the moisture content of the waste board, the higher the impurity content, and the smaller the particle size distribution of the set accelerator.

3. Samples of gypsum boards prepared using the set accelerators prepared in examples 1-3 and comparative examples 1-3 were tested according to the recommended national standard GB/T17669.4-1999 "determination of physical Properties of neat building Gypsum slurries" and the results are shown in Table 4:

TABLE 4

As can be seen from the experimental data in Table 4, the setting accelerator prepared by the impact mill is added to the gypsum board in examples 1-3, compared with the blank example, so that the initial setting time and final setting time of the gypsum board are shortened, the setting time of the gypsum board is shortened, and the setting accelerating effect is improved to a certain extent. Example 1 compared to comparative example 1, the setting accelerator prepared using an impact mill has a shorter initial setting time and final setting time of gypsum boards compared to the setting accelerator prepared using a ball mill, resulting in a shorter setting time of gypsum boards, a better setting accelerating effect of the setting accelerator, and a certain increase in strength of gypsum boards. In the process of producing the gypsum board, the gypsum board is ensured to finish final setting before the cutter, so that the coagulant prepared by using the waste board as the raw material and adopting the impact mill can better meet the production requirement and meet the production requirement.

Example 2 compared to comparative example 2, the lower the moisture content of the waste board, the shorter the time required for setting the gypsum board, the better the setting accelerator, and the better the strength of the gypsum board. Example 3 compared to comparative example 3, the impact mill was also used to prepare a gypsum board setting accelerator, and the higher the waste board impurity level, the shorter the time required for setting the gypsum board, the better the setting accelerator effect, and the greater the strength of the gypsum board.

In summary, compared with the gypsum board coagulant prepared by a ball mill, the gypsum board coagulant prepared by the impact mill has smaller volume weight, larger Bosch specific surface area and smaller particle size distribution, shortens the initial setting time and final setting time of the gypsum board, shortens the setting time of the gypsum board, has better setting accelerating effect, and can improve the strength of the gypsum board to a certain extent. And the impact mill is also adopted to prepare the gypsum board coagulant, the lower the water content of the waste board is, the higher the impurity content is, the shorter the time required for the gypsum board to be coagulated is, the better the coagulation accelerating effect of the coagulant is, and the strength of the gypsum board is also improved to a certain extent.

The description is of the preferred embodiment of the present application and is not intended to limit the present application in any way or manner. Those skilled in the art should, however, appreciate that many modifications, adaptations, and variations are possible in light of the above teaching without departing from the scope of the present invention; meanwhile, any equivalent changes, modifications and evolutions of the above embodiments according to the essential technology of the present application are within the scope of the present application defined by the claims.

Claims

1. A method for preparing gypsum board coagulant, wherein the raw material of the coagulant is waste material generated in the production of gypsum board, and the waste material is sent into an impact mill to be crushed to prepare the gypsum board coagulant.

2. The method of preparing a gypsum board set accelerator according to claim 1, wherein the waste material has a moisture content of less than 1% by weight.

3. The method of preparing a gypsum board set accelerator according to claim 1, wherein the impact mill is fed at a rate of 2kg to 20 kg.

4. The process for the preparation of set accelerators for gypsum board according to claim 1, wherein the impact mill is operated at a frequency of between 5 and 30 Hz.

5. The method of preparing a gypsum board set accelerator according to claim 1, wherein the impact mill is one or both of a vertical impact mill and a horizontal impact mill.

6. The method of making a gypsum board set accelerator according to claim 1, wherein the waste material is one or both of production waste board and three control waste board.

7. The method of making a gypsum board set accelerator according to claim 6, wherein one or both of the production waste board and the three control waste board contain fibrous impurities.

8. The method of preparing a set accelerator for gypsum board according to claim 7, wherein the fibrous impurities are waste paper.

9. The method of preparing a set accelerator for gypsum board according to any of claims 6 to 8, wherein the production waste board and the triple control waste board have an impurity content of 5 to 20% by weight.

10. Gypsum board set accelerator prepared according to the process of any one of claims 1 to 9.

11. The gypsum board set accelerator of claim 10, having a specific Boehringer surface area of 500m²/g～5000m²/g。