In the process of desulfurization gypsum production, the size of gypsum is small and its gradation is poor. Particle shape, particle size and specific surface area affect the water consumption of standard consistency to a certain extent. Small particle size means large contact area with water and rapid formation of saturated solution, but small particle size means increased water consumption for standard consistency (O.7-0.85 D type hemihydrate gypsum). In addition, the strength of hardened gypsum products will be reduced if the hydration rate is too fast and the dihydrate gypsum crystal is not uniform.

　　此外，脫硫石膏粒徑較小，平均粒徑相對集中，主要為40.609m。因此，脫硫灰泥加水后的流變性好，顆粒偏析分層現象嚴重，產品容重較大。

　　In addition, the particle size of desulfurized gypsum is small, and the average particle size is relatively concentrated, mainly 40.609m. Therefore, the fluidity of desulfurized mortar is good after adding water, the segregation and stratification of particles are serious, and the bulk density of the product is large.

　　高含水率:脫硫石膏的游離含水率一般為10%。15%，遠遠高于天然石膏，這使得運輸和儲存變得困難。

　　High water content: the free water content of desulfurized gypsum is generally 10%. 15% is much higher than natural gypsum, which makes transportation and storage difficult.

　　石膏粉的作用:

　　The function of gypsum powder:

　　1. 墻水準:

　　1. Wall Level:

　　一般用石膏粉裝修做基層處理，比如填補縫隙、陰陽角直移、粗糙的空白房間墻面次膩子求同。石膏的附著力好，不易產生脫落現象，平時使用進行墻面查找，一般不是直接使用石膏粉，也可以在里面加入滑石粉，否則施工會不太方便。

　　General use gypsum powder decoration to do basic treatment, such as filling gaps, Yin and Yang angle straight shift, rough blank room wall for the first time putty similarity. Gypsum has good adhesion and is not easy to fall off. Usually it is not used directly to find the wall surface. It can also be added with talcum powder. Otherwise, the construction will be inconvenient.

　　2. 石膏水泥生產:

　　2. Gypsum cement production:

　　添加適量的活化劑可生產硬石膏水泥或膠結材料，適用于軟土地基加固、墻體涂裝、力學模型、隧道支護及纖維壓板的生產。

　　Adding appropriate amount of activator can produce anhydrite cement or cementing material, which is suitable for soft soil foundation reinforcement, wall coating, mechanical model, tunnel support and production of fiberboard.

　　因為大多數的脫硫是濕的,所以不可避免的含有大量的水,它給脫硫石膏的生產帶來很大的影響,如干燥需要大量的能源消耗,也需要某些地方堆積和預干燥,因為脫硫石膏,在積累的過程中,因為風會帶來粉塵污染;在膠帶運輸過程中，石膏粉會附著在膠帶和輥筒上，給膠帶和輥筒的正常運行帶來很大的困難，需要經常清洗，導致生產不斷進行。脫硫石膏作為生產石膏建筑材料的原料，其游離水含量一般要求低于10%，但仍高于天然建筑石膏。

　　Because most desulphurization is wet, it inevitably contains a lot of water, which has a great impact on the production of desulphurization gypsum. For example, drying requires a lot of energy consumption, but also requires some places to accumulate and pre-drying, because desulphurization gypsum, in the accumulation process, because the wind will bring dust pollution; in the process of belt transportation, gypsum powder will adhere to tape and rollers, to the glue. Normal operation of belt and roller brings great difficulties and needs frequent cleaning, which leads to continuous production. Desulphurization gypsum is used as raw material for gypsum building materials. The free water content of desulphurization gypsum is generally less than 10%, but still higher than that of natural building gypsum.