Plastering gypsum is a new plastering material composed of hemihydrate gypsum and other gypsum phases, various admixtures and additional materials. It can be mixed and used as cement. It can not only cover the cement mortar mixed mortar bottom layer, but also cover the smooth bottom layers such as concrete large board wall, magnesium light board wall and gypsum board wall. No matter how thin the cover layer is, it will not crack and shell. After hardening, the surface is hard, smooth and fine, no dust, and the decorative effect is good. Re decoration on the surface of gypsum plastering layer, such as pasting wallpaper and painting, not only saves labor, materials and moisture, but also significantly increases the bonding strength with decorative materials due to low surface alkalinity, so as to prevent coating peeling and discoloration due to alkalization, or wallpaper degumming and corner rolling, so as to make the quality of decoration project more reliable. Due to the breathing effect of gypsum, It can also adjust the humidity of indoor air within a certain range to improve comfort.

在粉刷石膏中加入石粉取代部分石膏和天然砂，不仅可以缓解天然砂供应不足的问题，而且可以降低成本，提高粉刷石膏工厂的经济效益。本文通过比较研究石粉掺入粉刷石膏中取代部分石膏和天然砂对粉刷石膏性能的影响，得出了石粉用于粉刷石膏可行的结论，给出了掺入石粉后粉刷石膏的理想配比，并且将此配比进行大批量的生产，用于了实际工程，在满足施工要求的前提下取得了良好的经济效益。

Adding stone powder to the plastering gypsum to replace part of gypsum and natural sand can not only alleviate the problem of insufficient supply of natural sand, but also reduce the cost and improve the economic benefits of the plastering gypsum factory. In this paper, by comparing and studying the influence of stone powder added into plastering gypsum to replace part of gypsum and natural sand on the performance of plastering gypsum, it is concluded that stone powder is feasible for plastering gypsum, and the ideal ratio of plastering gypsum after adding stone powder is given. This ratio is produced in large quantities and used in practical engineering, On the premise of meeting the construction requirements, good economic benefits have been obtained.

原材料的选择

Selection of raw materials

脱硫石膏

Desulfurized gypsum

根据脱硫石膏的特性及工程使用需求，在选择用于配制粉刷石膏的脱硫石膏时应注意以下两点：

According to the characteristics and engineering use requirements of desulfurization gypsum, the following two points should be paid attention to when selecting desulfurization gypsum for preparing plastering gypsum:

控制有害杂质的含量。Cl-、Na+、K+属有害成分，含量过高不但会使石膏的脱水性下降，还会造成粉刷石膏表面返霜，影响材料的粘结强度，易出现空鼓开裂。一般控制Cl-含量小于0.01％，Na20、K20的含量宜小于0.06％。

Control the content of harmful impurities. Cl -, Na +, K + are harmful components. Too high content will not only reduce the dehydration of gypsum, but also cause frost return on the surface of plastered gypsum, affect the bonding strength of materials, and prone to hollowing and cracking. Generally, the content of Cl - should be less than 0.01%, and the content of Na20 and K20 should be less than 0.06%.

保证良好的颗粒级配。脱硫石膏比表面积相对较小，颗粒大小较为均匀，粒径分布较窄，主要集中在40-60级配远远差于天然石膏磨细后的石膏粉，不利于施工同时对强度也有一定的影响。

Ensure good particle grading. The specific surface area of desulfurized gypsum is relatively small, the particle size is relatively uniform, and the particle size distribution is narrow. It is mainly concentrated in the 40-60 grading, which is far worse than the gypsum powder ground by natural gypsum, which is not conducive to construction and has a certain impact on the strength.

为保证脱硫石膏良好的颗粒级配，应对脱硫石膏进行粉磨加工后方可应用。根据以上原则，本文确定选用河北某电厂烟气脱硫石膏，初凝时间17min，终凝时间21min，2h抗折强度3.88Mpa，抗压强度9.92Mpa，pH值7.0，碱含量0.02％，

In order to ensure good particle gradation of desulfurization gypsum, desulfurization gypsum shall be grinded before application. According to the above principles, the flue gas desulfurization gypsum of a power plant in Hebei is selected in this paper, with initial setting time of 17min, final setting time of 21min, 2h, flexural strength of 3.88mpa, compressive strength of 9.92mpa, pH value of 7.0 and alkali content of 0.02%,

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The above wonderful contents are provided by Jinan gypsum powder. Please consult and pay attention //www.gochiism.com