Calcium Sulfate Dihydrate, with the CAS number 10101 - 41 - 4, is a common inorganic compound. Its chemical formula is CaSO₄·2H₂O. It appears as a white, odorless powder or fine crystalline solid. It has a molar mass of approximately 172.17 g/mol. This compound is slightly soluble in water. The solubility of calcium sulfate dihydrate in water at 20°C is about 0.24 g/100 mL. It has a density of around 2.32 g/cm³. Calcium Sulfate Dihydrate is stable under normal temperature and pressure conditions, but when heated to a high enough temperature, it loses its water of crystallization and forms anhydrous calcium sulfate.
1. Construction Industry: Calcium Sulfate Dihydrate is widely used in the construction field. It is a key raw material for making plasterboard. Plasterboard is used for interior wall partitions, ceilings, and decorative purposes. Its fire - resistant and sound - insulating properties make it a popular choice in building construction.
2. Agriculture: In agriculture, it can be used as a soil conditioner. It helps to improve the soil structure by reducing soil compaction, enhancing water infiltration, and increasing the availability of nutrients to plants. It is also a source of calcium and sulfur for plants, which are essential nutrients for their growth and development.
3. Food Industry: It is used as a food additive. In baking, it can be used as a dough conditioner to improve the texture and volume of bread. It is also used in the production of tofu as a coagulant.
1. Construction: When using calcium sulfate dihydrate to make plasterboard, it is usually mixed with water to form a slurry. The slurry is then spread between two sheets of paper and allowed to dry. The setting time can be controlled by adding certain additives.
2. Agriculture: For soil conditioning, it can be applied directly to the soil. The recommended application rate depends on the soil type and the specific needs of the plants. Generally, it is spread evenly over the soil surface and then incorporated into the soil by tillage.
3. Food Industry: In food applications, it should be used in accordance with the relevant food safety standards. For example, when using it as a dough conditioner in baking, it is added to the flour mixture in a specific proportion and then mixed thoroughly with other ingredients.
1. Construction Case: A large - scale commercial building project in the city center planned to use plasterboard for interior partitions. The construction team used calcium sulfate dihydrate to produce high - quality plasterboard. By carefully controlling the mixing ratio of calcium sulfate dihydrate and water and adding appropriate additives, they were able to produce plasterboard with excellent fire - resistant and sound - insulating properties. The project was completed on time, and the plasterboard met all the required building standards, which not only improved the overall quality of the building but also reduced the construction cost.
2. Agriculture Case: A fruit farm in a rural area had problems with soil compaction and low nutrient availability. The farm owner decided to apply calcium sulfate dihydrate to the orchard soil. After a few months, the soil structure improved significantly. The water infiltration rate increased, and the fruit trees showed better growth. The yield of fruits also increased by about 15% compared to the previous year, indicating that calcium sulfate dihydrate effectively enhanced the soil fertility and plant growth.
3. Food Industry Case: A small - scale bakery started using calcium sulfate dihydrate as a dough conditioner. By adding a small amount of calcium sulfate dihydrate to the flour, the bakery was able to produce bread with a softer texture, better volume, and longer shelf - life. The bread became more popular among customers, and the bakery's sales increased by 20% within a few months.
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