Application of calcium chloride desiccant
Granular anhydrous calcium chloride is usually used as a desiccant to fill the drying tube, and macroalgae (or seagrass ash) dried with calcium chloride can be used in the production of soda ash.
Some household dehumidifiers use calcium chloride to absorb moisture from the air.
Calcium chloride can also be used as a desiccant or dehydrating agent for gaseous and organic liquids.
Since calcium chloride is neutral, it can dry acids, alkalis, organic liquids, or produce small amounts of gases in the laboratory, such as nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide, carbon dioxide, nitrogen dioxide.
However, it cannot be used to dry ethanol and ammonia, because ethanol and ammonia will react with calcium chloride to produce the alcohol complex cacl2.4c2h5oh and ammonia cacl2.8nh3.
Anhydrous calcium chloride can also be used as an air hygroscope for writer products, and anhydrous calcium chloride is approved by the FDA for bandaging first aid, and its role is to ensure the dryness of the wound.
Anhydrous calcium chloride is laid on a gravel road surface, and the humidity control of anhydrous calcium chloride on the road surface is used.
Calcium chloride can be used as a de-icing agent and in cooling baths
Calcium chloride hydrate is laid on top of calcium chloride to prevent icing, de-icing and snowmelt, but the melted brine will damage the soil and vegetation along the way, making the pavement concrete deteriorate.
Calcium chloride solution can also be mixed with dry ice to prepare a low-temperature cooling bath.
Add the stick-like dry ice to the brine solution in batches until ice cubes appear in the system.
The stable temperature of the cooling bath can be maintained by different types and concentrations of salt solutions.
In general, the commonly used calcium chloride as a salt raw material, by adjusting the concentration to obtain the required stable temperature, not only because calcium chloride is cheap and easy to obtain, but also because the eutectic temperature of the calcium chloride solution (that is, the temperature when all solutions condense to form granular ice salt particles) is quite low, up to -51.0 °C, so that the adjustable temperature range from 0 °C to -51 °C.
This is achieved in the dewar bottle and can also be cooled in a normal plastic container while the volume of the dewar bottle is limited.
Calcium chloride can be used as a source of calcium ions
The addition of calcium chloride to the swimming pool water can make the pool water become a pH buffer, improve the hardness of the swimming pool water, and thus reduce the erosion of the pool wall concrete.
According to the principle and isoion effect of Le Châtre, increasing the concentration of calcium ions in swimming pool water can slow down the dissolution of essential calcium compounds in concrete structures.
The addition of calcium chloride to the water of marine aquariums can increase the calcium content that can be used by organisms in the water, and aquarium-farmed soft animals and coelenterate animals can use it to form calcium carbonate shells.
Although calcium hydroxide or calcium reactors can achieve the same purpose, in contrast, the addition of calcium chloride has the least effect on the pH of water.
Other aspects
Hydrated calcium chloride solids can be used as phase change energy storage materials.
For example, calcium chloride hexahydrate can be used as industrial waste heat recovery and the absorption and utilization of solar radiant heat, because it can be used as a medium and low temperature (that is, the heat absorbed by the substance from the solid phase to the liquid phase at the same temperature) reaches 190kj/mol, so it can be used as an industrial waste heat recovery and the absorption and utilization of solar radiant heat at medium and low temperatures, but it is similar to all inorganic hydrated salt phase change materials, there is a serious supercooling problem (supercooling degree reaches 20 ° c), which needs to be overcome by adding nuclear agents.
Calcium chloride helps speed up the initial setup in concrete, but chloride ions can cause corrosion of the reinforcement, so calcium chloride cannot be used in reinforced concrete.
Because of its hygroscopicity, anhydrous calcium chloride can provide a certain degree of moisture to concrete.
Calcium chloride is also an additive in plastics and fire extinguishers, as a filter aid in wastewater treatment, as an additive in blast furnaces, to control the aggregation and bonding of raw materials, thereby avoiding charge settlement, and as a binder in fabrics.