Calcium Sulfate with the CAS number 99400 - 01 - 8 is a chemical compound that is widely used in various industries. It commonly exists in two forms: anhydrous calcium sulfate (CaSO₄) and calcium sulfate dihydrate (CaSO₄·2H₂O), also known as gypsum. The anhydrous form is a white crystalline powder, while the dihydrate form appears as a white or colorless crystal.
The molar mass of anhydrous calcium sulfate is approximately 136.14 g/mol, and for calcium sulfate dihydrate, it is around 172.17 g/mol. It has a density that varies depending on the form. For example, the density of gypsum is about 2.32 g/cm³. Calcium sulfate is sparingly soluble in water, and its solubility is affected by temperature and the presence of other substances in the solution.
In the construction industry, calcium sulfate is a key ingredient in building materials. Gypsum is used to make plasterboard, a common material for interior wall partitions and ceilings. It provides good fire - resistance, sound - insulation properties, and is easy to install and finish. Anhydrous calcium sulfate can be used as a drying agent in the manufacture of certain building products to control moisture content during the production process.
In the agricultural sector, calcium sulfate is used as a soil conditioner. It can improve soil structure, making it more porous and allowing better water infiltration and root penetration. It also provides essential calcium and sulfur nutrients to plants, which are important for plant growth and development. Additionally, it can be used to reduce soil salinity and improve the availability of other nutrients in the soil.
In the food industry, calcium sulfate is used as a food additive. It is approved by regulatory authorities for use as a firming agent, a pH regulator, and a nutritional supplement. For example, it is used in the production of tofu to help coagulate the soy milk, giving the tofu a firm texture.
When using calcium sulfate in construction for making plasterboard, the gypsum is first ground into a fine powder. Then, it is mixed with water, additives (such as starch for binding and retarders to control the setting time), and other materials. The mixture is poured onto a paper backing, and a second paper layer is placed on top. The mixture sets and hardens through a process of crystallization, forming a solid plasterboard.
In agriculture, calcium sulfate can be applied to the soil either in a dry powder form or as a solution. For dry application, it is spread evenly over the soil surface and then tilled into the soil to a certain depth. When used as a solution, it can be sprayed onto the soil or applied through irrigation systems. The application rate depends on the soil type, the crop being grown, and the specific soil conditions.
In the food industry, the appropriate amount of calcium sulfate is added during the food production process according to the recipe and regulatory requirements. For example, in tofu production, it is added to the heated soy milk in a specific proportion to initiate the coagulation process. Care should be taken to ensure accurate measurement to achieve the desired product quality.
Case 1: Construction Project in a Commercial Building
In a large - scale commercial building project, calcium sulfate - based plasterboard was used for the interior partitioning. The use of plasterboard not only saved construction time compared to traditional brick walls but also provided excellent fire - resistance. During a fire drill, the plasterboard partitions withstood the high - temperature for a long time, preventing the spread of fire and smoke, which protected the people and property in the building. The smooth surface of the plasterboard also allowed for easy painting and decoration, giving the interior a modern and professional look.
Case 2: Agricultural Use in a Vineyard
A vineyard was facing problems with poor soil structure and low calcium levels in the soil. After applying calcium sulfate as a soil conditioner, the soil became more porous, and the grapevines showed improved growth. The calcium provided by the calcium sulfate strengthened the grapevine's cell walls, making the plants more resistant to diseases and pests. The yield of grapes increased significantly, and the quality of the wine produced from these grapes also improved, with better flavor and aroma.
Case 3: Tofu Production in a Food Factory
A tofu factory switched from using traditional coagulants to calcium sulfate. The tofu produced with calcium
Este é o William, Diretor Executivo da Zhishang Chemical Co., Ltd.
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