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，不僅可以緩解天然砂供應(yīng)不足的問(wèn)題，而且可以降低成本，提高粉刷石膏工廠的經(jīng)濟(jì)效益。本文通過(guò)比較研究石粉摻入粉刷石膏中取代部分石膏和天然砂對(duì)粉刷石膏性能的影響，得出了石粉用于粉刷石膏可行的結(jié)論，給出了摻入石粉后粉刷石膏的理想配比，并且將此配比進(jìn)行大批量的生產(chǎn)，用于了實(shí)際工程，在滿足施工要求的前提下取得了良好的經(jīng)濟(jì)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.

原材料的選擇

Selection of raw materials

脫硫石膏

Desulfurized gypsum

根據(jù)脫硫石膏的特性及工程使用需求，在選擇用于配制粉刷石膏的脫硫石膏時(shí)應(yīng)注意以下兩點(diǎn)：

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:

控制有害雜質(zhì)的含量。Cl-、Na+、K+屬有害成分，含量過(guò)高不但會(huì)使石膏的脫水性下降，還會(huì)造成粉刷石膏表面返霜，影響材料的粘結(jié)強(qiáng)度，易出現(xiàn)空鼓開裂。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%.

保證良好的顆粒級(jí)配。脫硫石膏比表面積相對(duì)較小，顆粒大小較為均勻，粒徑分布較窄，主要集中在40-60級(jí)配遠(yuǎn)遠(yuǎn)差于天然石膏磨細(xì)后的石膏粉，不利于施工同時(shí)對(duì)強(qiáng)度也有一定的影響。

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.

為保證脫硫石膏良好的顆粒級(jí)配，應(yīng)對(duì)脫硫石膏進(jìn)行粉磨加工后方可應(yīng)用。根據(jù)以上原則，本文確定選用河北某電廠煙氣脫硫石膏，初凝時(shí)間17min，終凝時(shí)間21min，2h抗折強(qiáng)度3.88Mpa，抗壓強(qiáng)度9.92Mpa，pH值7.0，堿含量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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