Large collection of uses of calcium chloride
Release time：
2022-05-13 14:52
Application of calcium chloride desiccant
Granular anhydrous calcium chloride is usually used as a desiccant to fill the drying tube. The giant algae (or seaweed 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 desiccant or dehydrating agent for gases and organic liquids.
Because calcium chloride is neutral, it can dry acid, alkali and organic liquids, and can also produce a small amount of gases in the laboratory, such as nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide, carbon dioxide and nitrogen dioxide.
However, it cannot be used to dry ethanol and ammonia, because ethanol and ammonia will react with calcium chloride to produce alcohol compound CaCl2 4c2h5oh and ammonia compound CaCl2 8NH3。
Anhydrous calcium chloride can also be used as the air hygroscopic agent of the writer's product. Anhydrous calcium chloride is approved by FDA for dressing and first aid, and its function is to ensure the dryness of the wound.
The anhydrous calcium chloride is paved on the gravel pavement, and the humidity of anhydrous calcium chloride on the pavement is controlled.
Calcium chloride can be used in deicing agent and cooling bath
Laying calcium chloride hydrate on calcium chloride can prevent icing, deicing and snow melting, but the melted salt water will damage the soil and vegetation along the way and worsen the pavement concrete.
Calcium chloride solution can also be mixed with dry ice to prepare low-temperature cooling bath.
Add dry ice sticks to the brine solution in batches until ice appears in the system.
The stable temperature of cooling bath maintained by different kinds and concentrations of salt solutions will be different.
Generally speaking, calcium chloride is commonly used as salt raw material to obtain the required stable temperature by adjusting the concentration, not only because calcium chloride is cheap and easy to obtain, but also because the eutectic temperature of calcium chloride solution (i.e. the temperature when all solutions condense to form granular ice salt particles) is quite low, up to - 51.0 ℃, so the adjustable temperature range is from 0 ℃ to - 51 ℃.
The utility model can be realized in a Dewar bottle, and can also be cooled with an ordinary plastic container while the volume of the Dewar bottle is limited.
Calcium chloride can be used as a source of calcium ions
Adding calcium chloride into the swimming pool water can make the swimming pool water become a pH buffer, improve the hardness of the swimming pool water, and reduce the erosion of the swimming pool wall concrete.
According to le Chatelier's principle and the same ion effect, increasing the concentration of calcium ion in swimming pool water can slow down the dissolution of essential calcium compounds in concrete structure.
Adding calcium chloride to the water of marine aquarium can increase the calcium content available to organisms in the water, and soft animals and coelenterates cultured in aquarium can use it to form calcium carbonate shell.
Although calcium hydroxide or calcium reactor 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 solid can be used as phase change energy storage material.
For example, calcium chloride hexahydrate can be used for industrial waste heat recovery and absorption and utilization of solar radiation heat. Because it can be used as medium and low temperature (i.e. the heat absorbed by the material in the process from solid phase to liquid phase at the same temperature) to reach 190kj / mol, it can be used for industrial waste heat recovery and absorption and utilization of solar radiation heat at medium and low temperature. However, it is similar to all inorganic hydrated salt phase change materials and has serious supercooling problem (undercooling degree reaches 20 ° C), Nuclear agents need to be added to overcome.
Calcium chloride in concrete helps to accelerate the initial setting, but chloride ions can lead to reinforcement corrosion, so calcium chloride cannot be used in reinforced concrete.
Because of its hygroscopicity, anhydrous calcium chloride can provide a certain degree of moisture for concrete.
Calcium chloride is also an additive in plastics and fire extinguishers. It is used as a filter aid in wastewater treatment and as an additive in blast furnace to control the aggregation and bonding of raw materials, so as to avoid furnace charge settlement and as a binder in fabric.
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How to use snow melting agent？
The function of snow melting agent is to melt the snow on the road. The speed of snow melting is fast, the dosage is small, and it is easy to dredge the road. What are the methods of using snow melting agent?
Function of calcium chloride desiccant
Desiccant, as the name suggests, is used for drying and moisture-proof. For example, the desiccant in the food bag absorbs the moisture in the bag, so that the food will not be affected by moisture and deterioration, and keep the fresh and crisp taste. In the wardrobe, the desiccant can be prevented, even in the rainy season, the clothes will not be affected by moisture and mildew. In the garage, the desiccant can prevent the car parts from moisture even if the car is not used for a long time, Desiccant is widely used, in fact, it can be used in many living and production environments.
Application method of solid environmental protection snow melting agent
Application method of solid environmental protection snow melting agent Snow melting agent When it snows in winter, we often use snow melting agent, which is mainly used for snow and ice removal of urban roads, highways, airports, ports, bridges and other facilities. Some snow melting agents can also be used as quick melting agent and antifreeze admixture for ice and snow melting in winter construction of construction projects. So how is it used? 1. Usage: snow melting agent is sprayed by spraying truck, which is usually solid spraying. When there is no snow melting agent, it can be loaded by truck and scattered manually. 2. Dosage: during solid spraying, it can be determined according to the situation of each region, and the reference parameter is 50-100g / m2. 3. Usage time: the time of spreading snow melting agent is mainly determined according to meteorological conditions (snowfall, wind speed and temperature). Generally, it can be spread at the beginning of snow, or it is estimated that it can be spread 1-2 hours before the road freezes. In case of heavy snow, the spreading amount and times shall be adjusted based on the fact that the ground is not frozen. When the ground is covered with thick ice and snow, appropriate vehicles or tools shall be used to remove the ice and snow before spreading, so as to reduce the use of snow melting agent.
Composition and drying principle of calcium chloride desiccant
Its main raw material is calcium chloride, which can chemically react water molecules with calcium chloride to absorb moisture from the surrounding environment and convert it into gel to achieve adsorption effect. The internal substance of calcium chloride desiccant is powder. If a child tears the package of calcium chloride desiccant, the calcium chloride powder inside is easy to enter the eyes, which will cause symptoms such as eyelid redness and swelling, white burns on cornea and conjunctiva. In mild cases, corneal leukoplakia will be caused after treatment, affecting vision, and in severe cases, blindness will be caused. At the same time, although calcium chloride can be used as food additives, calcium chloride desiccant is not edible. The packaging materials of calcium chloride desiccant are generally fixed. The inner layer is PET film + unidirectional breathable cloth or unidirectional breathable DuPont paper, and the outer layer is unidirectional breathable cloth, which can well prevent the leakage of calcium chloride desiccant. Calcium chloride desiccant becomes water after absorbing moisture. In fact, it is not pure water, but calcium chloride aqueous solution. If nothing else is added, it will flow out. Therefore, calcium chloride desiccant needs to add starch, so calcium chloride desiccant will turn into yellow condensate after moisture absorption.