Lime powder, white powder substance. The application range is very wide, the most common is used in the construction industry, that is, industrial calcium carbonate. Heating limestone produces a chemical called lime powder or calcium oxide (Calcium Oxide). Under normal circumstances, the application of calcium oxide foods within 2 milligrams is not harmful, but the concentration of more than 25 milligrams can lead to serious side effects such as pneumonia. Therefore, if you have contacted or ingested lime powder, it is best to consult a doctor to take necessary measures. So what kind of material is lime powder in the end? What are the uses and classifications of lime powder ? Let's give a brief introduction on the use and classification of lime powder . We hope to help everyone.
Lime powder
First of all, let's look at the basic situation of lime powder and have a simple understanding of it. Lime powder is a white powdered material. Its application is very extensive. The most common one is used in the construction industry because it is an important building material in itself. There is also a familiar name for lime powder, which is industrial calcium carbonate. This is because of the composition of lime powder. Lime powder plays an important role in the modern construction industry.
Lime powder classification
Next, let's look at the classification of lime powder. After Xiaobian's understanding of lime powder can be divided into the following three categories. The first is lime powder with calcium carbonate as its main component. The other is light calcium carbonate, which is obtained by firing limestone. The lime powder is not pure and its quality is not very good. There is also a kind of lime powder that is of other kinds, and the ingredients are more complicated.
Lime powder use
Lime has a wide range of applications in civil engineering. The main uses are as follows:
(1) lime milk and mortar hydrated lime powder or lime paste mixed with a lot of paint. Lime plaster or hydrated lime powder can be used to prepare lime mortar or cement lime mixed mortar for masonry or plastering works.
(2) Lime Stabilized Soil Mixing slaked lime powder or quicklime powder in various crushed or originally loose soils, the mixture obtained after mixing, compaction and curing is called lime stabilized soil. It includes lime soil, lime stabilized gravel, lime gravel soil and so on. Lime stabilized soil has a certain strength and water resistance. It is widely used as the base of a building, the cushion of the ground and the pavement base of a road.
(3) Silicate products are mainly made of lime (slaked lime powder or quicklime powder) and siliceous materials (sand, fly ash, volcanic ash, slag, etc.), and can be obtained after batching, mixing, shaping and curing. , Blocks and other products. Because the internal gelling material is mainly hydrated calcium silicate, it is called silicate product. Commonly used are lime sand brick and fly ash brick.
Lime powder production process
The original lime production process is to lay limestone and fuel (wood) in layers, and fire ignition for a week. Modern use of mechanized, semi-mechanical shaft kiln and rotary kiln, boiling furnace and other equipment for production. The calcination time is also correspondingly shortened, and it takes only 2 to 4 hours to produce lime from a rotary kiln, which can increase the production efficiency by more than 5 times than that produced by a vertical kiln. The technology and equipment with significant energy-saving effects such as cross-flow type, double-slope type and oil-fired annular shaft kiln, and short rotary kiln with preheater are also expanded to coal, coke, heavy oil or liquefied gas.
Packed in a plastic woven bag lined with polyethylene plastic film bags, net weight 25kg. Should be stored in a dry warehouse. Prevent moisture. Avoid storage and transportation with acids. Avoid rain when transporting. In case of fire, use water, sand or a common fire extinguisher to save. Physically delicate white powder. Relative density 2.24. Absorb carbon dioxide in the air to make calcium carbonate. Soluble in acid, ammonium salt, glycerin, slightly soluble in water, insoluble in alcohol, strong alkaline, corrosive to skin, fabrics, utensils and other substances. Its aqueous solution is commonly known as lime water.
Lime powder hazards and side effects
Contact effect
Direct contact with lime powder over 25 mg, also known as quicklime, can cause damage to the eyes and skin. This white granular powder stimulates the eyes and causes dry skin inflammation. In order to protect the body, protective glasses, gloves, boots, hats and clothing should be worn to avoid direct contact with lime powder. If the eyes come into contact with quicklime, immediately lift up the eyelids and rinse thoroughly with clean water for 15 minutes. Of course, don't forget to clean the skin and prevent skin problems.
Inhalation effect
Inhalation of 25 mg of calcium oxide can cause respiratory tract reactions such as coughing, sneezing and shortness of breath. High concentrations of lime powder may cause perforation of the nasal septum. This substance will irritate the upper respiratory tract and cause repeated episodes of bronchitis. In addition, inhalation of quicklime can cause pulmonary fluid retention, pulmonary edema, and inflammation of the lung tissue. Therefore, after contact with the lime powder, you should leave immediately and consult your doctor as appropriate.
Intake effect
Ingestion of lime powder can cause minor to serious consequences such as digestive tract discomfort and constipation. Swallowing lime can also cause hypercalcemia and cause nausea, cramps, loss of appetite, vomiting, and even kidney and muscle problems. In addition, the consumption of quicklime may cause abnormal bleeding or hemorrhage, which need to be sent to the emergency room immediately.
Crystalline silica effect
Silica crystals, also called quartz, are the basic components of soil, sand, granite, and other minerals, and are found in small amounts in lime powder. In addition to being classified as a lung carcinogen, crystalline silica can cause a fatal lung disease called silicosis. Silica dust can scar the lungs, impede oxygen intake, and make breathing difficult. The most common form of this disease is chronic silicosis, which develops 15-20 years after exposure to quartz, but people who are exposed to crystalline silica may develop disease within 5-10 years.
Editor's summary: The above is a description of the lime powder and its associated knowledge of the hazards and side effects of lime powder. I hope to help friends who have this need! For more information about you and more, please continue to follow our website. More exciting content will follow.
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