Jinhui Environmental Protection Shows You the Differences Between Quicklime and Hydrated Lime
2020-07-09
Source：
Author：
Lime is divided into two types: quicklime (CaO) and slaked lime. Although they look quite similar, they have obvious differences, especially in chemical properties.
Quicklime is calcium oxide with the chemical formula CaO. Physically, it appears as a white powder on the surface; impure quicklime is off-white, and turns gray or light yellow when containing impurities. It is hygroscopic.
Main applications: It is widely used in construction, and also for the production of calcium carbide, liquid caustic soda, bleaching powder and gypsum. The preparation reaction of bleaching powder is: chlorine gas is passed into lime milk, with the chemical equation（2Cl2+2Ca(OH)2=Ca(ClO)2+CaCl2+2H2O）In laboratories, it is used for drying ammonia gas and dehydrating alcohols. Calcium oxide can release a large amount of heat when reacting with water, so it is often used in self-heating packaging. During the Destruction of Opium at Humen, Lin Zexu put opium and calcium oxide into water to decompose opium, so as to prevent harmful fumes and avoid soil pollution caused by opium.
Slaked lime refers to calcium hydroxide. Its dust or suspended droplets can irritate the mucous membranes and cause sneezing and coughing. Similar to alkalis, it can emulsify fats, absorb moisture from the skin, dissolve proteins, and irritate even corrode body tissues. Inhalation of lime dust may lead to pneumonia. The maximum allowable concentration is 5mg/m³.If dust is inhaled, one may inhale water vapor, codeine and eupaverine, and apply mustard plaster on the chest. If it gets into the eyes, flush immediately with running water, then rinse with 5% ammonium chloride solution or 0.01% CaNa₂-EDTA solution, and finally instill 0.5% tetracaine solution.During operation, please protect the respiratory organs, wear work clothes and gloves made of dust-proof fiber, sealed dust-proof goggles, and apply oily ointment to prevent dust inhalation.
Quicklime is a common food desiccant. It absorbs moisture in the air to extend the shelf life of food and other products. The white powder we often find in some packaged goods is quicklime. After quicklime reacts with water and deteriorates, it can no longer function as a desiccant, which is essentially equivalent to slaked lime.
When distinguishing the two, do not add too much water to avoid high-temperature scalds. Quicklime will react violently with a small amount of water. If a large amount of water is needed to trigger a reaction, the lime has partially deteriorated. If there is no reaction with water at all, it is slaked lime.Above is an analysis of the differences between quicklime and slaked lime. For more information about lime lumps, welcome to inquire and consult us at any time.
Previous page:
Next page:
Do you have any questions?
For a quick reply, please fill in the form and our team will get back to you soon.
Contact Us
Nanshanying Village, Shanying Town, LonganDistrict, Anyang City, Henan Province, China.
Copyright © Anyang Jinhui Environmental Protection Technology Co., Ltd
Powered by :www.300.cn Supported IPV6 Privacy Agreement