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Limestone in calcium oxide is heated above 900℃ in a lime kiln.
Classification: News
Release time: 2023-06-28
Summary: We basically know that calcium oxide is a white powder, containing other substances that are light yellow or gray powders, but it also has hygroscopic properties. The limestone in calcium oxide is heated in a lime kiln to above 900°C. It can be used as a drying agent, commonly used to prevent moisture from returning to debris. It releases a large amount of heat when combined with water or absorbs moisture from humid air, which is mature lime [calcium hydroxide Ca(OH)2, a white powdery solid. Chemical Caa(OH)2, also known as slaked lime. After adding water, there are two layers: the upper layer solution is called slaked lime water, and the lower layer suspension is called lime milk or lime paste. For general calcium hydroxide manufacturers, the calcium oxide in lime refers to some active calcium oxide that is easily hydrolyzed to produce calcium hydroxide. Due to the heating temperature, some calcium oxide does not immediately undergo hydrolysis in water and still exists in the form of free calcium oxide. Free calcium oxide in water is also known as calcium peroxide. Lime generally contains a small amount of calcium silicate, calcium aluminate, calcium ferrite, and other calcium chemical substances, which are inactive calcium salts. Below is a brief introduction to the differences between the two from professional calcium hydroxide manufacturers. 1. The whiteness of calcium oxide must reach above 90, and it must pass strength tests to ensure the whiteness of putty powder, improving the coating, hardness, and waterproof ability. 2. The production of gray calcium requires high-speed damage and waste removal through a gray calcium machine to achieve uniform fineness, increase looseness, have good gloss, and be easy to scrape during construction. 3. During the decomposition process of calcium oxide, it should undergo incomplete thermal decomposition and cannot decompose like calcium hydroxide. Otherwise, due to the short decomposition time, it has poor water retention during use, which can easily lead to drying and other issues, resulting in poor stability of the coating, which is not conducive to construction. Due to the non-toxic, odorless, and pollution-free nature of inorganic immersion waterproof agents, they can be directly used in drinking water facilities. Inorganic immersion waterproof agents can be directly applied to the surface of wet concrete, hardening quickly, with a short construction period and safe construction. Inorganic immersion waterproof agents also have advantages such as good waterproof effect, aging resistance, long service life, and low cost. In addition, the use of waste fly ash from power plants is beneficial for comprehensive environmental management. By incorporating calcium hydroxide and low-alkali expansion agents into concrete, fibers can suppress early shrinkage cracks in concrete; through wet curing, continuously generating hydration products of expansion agents such as ettringite, self-stress is produced in concrete during the cement hardening process, compensating for shrinkage in concrete and playing a role in preventing seepage and cracking.
We basically all know that calcium oxide is a white powder, containing other substances that are light yellow or gray powder, but it is also hygroscopic.
The limestone in calcium oxide is heated in a lime kiln to above 900℃. It can be used as a drying agent, commonly used to prevent moisture from returning to debris. It releases a large amount of heat when combined with water or absorbs moisture from humid air, that is, mature lime [calcium hydroxide Ca(OH)2, which is a white powdery solid. Chemical Caa(OH)2. Also known as slaked lime. After adding water, there are two layers, the upper layer solution is called slaked lime water, and the lower layer suspension is called lime milk or lime paste.
For general calcium hydroxide manufacturers, the calcium oxide in lime refers to some active calcium oxide that is easily hydrolyzed to produce calcium hydroxide. Due to the heating temperature, some calcium oxide cannot immediately undergo hydrolysis in water and still exists in the form of free calcium oxide, which is also known as calcium peroxide in water. Lime generally contains a small amount of calcium silicate, calcium aluminate, calcium ferrite, and other calcium chemical substances, which are inactive calcium salts. Below is a brief introduction to the differences between the two by professional calcium hydroxide manufacturers.
1. The whiteness of calcium oxide must reach above 90, and it must pass strength tests to ensure the whiteness of putty powder, improving the coating, hardness, and waterproof ability.
2. The production of gray calcium requires high-speed damage and waste removal through a gray calcium machine to achieve uniform fineness, increase looseness, have good gloss, and be easy to scratch during construction.
3. During the decomposition process of calcium oxide, it should undergo incomplete thermal decomposition and cannot be decomposed like calcium hydroxide. Otherwise, due to the short decomposition time, it has poor water retention during use, is prone to drying issues, and has poor stability in coatings, which is not conducive to construction.
Due to the non-toxic, odorless, and pollution-free nature of inorganic soaking waterproof agents, they can be directly used in drinking water facilities. Inorganic soaking waterproof agents can be directly applied to the surface of wet concrete, harden quickly, have a short construction period, and are safe to construct. Inorganic soaking waterproof agents also have advantages such as good waterproof effect, aging resistance, long service life, and low cost.
In addition, the use of waste fly ash from power plants is beneficial for comprehensive environmental management. By incorporating calcium hydroxide and low-alkali expansion agents into concrete, fibers are used to suppress early shrinkage cracks in concrete; through wet curing, continuously generating hydration products of expansion agents such as ettringite, which generates self-stress in concrete during the hardening process of cement, compensating for shrinkage in concrete and playing a role in preventing seepage and cracking.
Key words: Limestone in calcium oxide is heated above 900℃ in a lime kiln.
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