Calcium sulfate has a wide range of uses in various industries except for its medical - grade applications. Some of its main functions are as follows:
In the Construction Industry
It is a crucial raw material for producing plaster and drywall. Gypsum, a form of calcium sulfate dihydrate, is heated to remove some of its water content, forming plaster of Paris. When mixed with water, plaster of Paris can be easily molded and then hardens quickly, making it suitable for creating decorative elements, filling gaps, and leveling surfaces. In the production of drywall, calcium sulfate is the main component of the core, providing strength and fire - resistance properties.
In the Food Industry
It is used as a food additive with multiple functions. As a firming agent, it is added to products like tofu to help form a stable gel - like structure, improving its texture and firmness. It can also be used to regulate the setting time of baked goods. By controlling the rate of chemical reactions during baking, it helps achieve the desired texture and volume of bread, cakes, and other pastries. Additionally, it is used as a nutrient supplement to provide calcium, an essential mineral for human health.
In the Agricultural Industry
Calcium sulfate can be used to improve soil structure. It helps to break up compacted soil, enhance soil porosity, and improve water infiltration and drainage. This is particularly beneficial in heavy clay soils. Moreover, it supplies essential nutrients to plants. The calcium in calcium sulfate is important for plant cell wall development and overall plant growth, while the sulfur is involved in various metabolic processes within the plant.
In the Manufacturing of Ceramics and Glass
In the ceramics industry, calcium sulfate is used as a filler and a fluxing agent. It can improve the plasticity of clay, making it easier to shape and mold. During the firing process, it helps to lower the melting point of the ceramic materials, promoting better fusion and reducing energy consumption. In the glass industry, it is added to the glass - making batch to adjust the viscosity and surface tension of the molten glass, which aids in the formation of a smooth and defect - free glass surface.
In the Paper Industry
Calcium sulfate is used as a filler in paper production. It can increase the opacity, brightness, and smoothness of paper, improving its printing quality. It also helps to reduce the cost of paper production by partially replacing more expensive pulp. Additionally, it can enhance the physical strength of the paper, making it more resistant to tearing and abrasion.