Calcium oxide

Specifications

Calcium oxide  is a kind of inorganic compounds, its chemical formula is CaO, the name of lime. The physical properties of the surface is white powder, impure gray white, containing impurities is light yellow or gray, with moisture absorption. [
Physical property
White or gray block or particle. Soluble in acids, glycerol and sucrose solution, almost insoluble in ethanol. Relative density of 3.32 ~ 3.35. Melting point 2572. Boiling point 2850. The refractive index of 1.838.
Chemical property
Calcium oxide is a basic oxide, which is sensitive to moisture. Easy to absorb carbon dioxide from the air and water. React with water to produce calcium hydroxide (Ca (OH) 2) and produce a lot of heat, corrosive.
CaO+H2O==Ca (OH) 2
Use
1, can be used as a filler, for example: filler used as epoxy adhesive;
2, as an analytical reagent, gas analysis used as carbon dioxide absorber, spectral analysis reagent, high purity reagent for semiconductor production in the epitaxial, diffusion process, laboratory ammonia drying and alcohol dehydration L.
3, used as a raw material, calcium carbide manufacturing, soda, bleaching powder, also used in tanning waste water purification, calcium hydroxide and calcium compounds;
4, can be used as building materials, metallurgical flux, cement admixture, flux of fluorescent powder;
5, vegetable oil as decoloring agent, drug carrier, soil improvement agent and calcium fertilizer;
6, can also be used for refractories, desiccant [1];
7, can be made of 1 agricultural, No. 2 epoxy adhesive glue and water, also used as reactants and 2402 resin pre;
8, used for acid wastewater treatment and sludge conditioning;
9, also can be used as boiler stop protection agent, the use of the ability to use lime, so that the boiler water vapor system of metal surface to maintain dry, prevent corrosion, suitable for low pressure, medium pressure, small capacity drum boiler long-term stop protection;
10, can react with water to prepare calcium hydroxide, reaction equation: CaO+H O=Ca (OH), belonging to the chemical reaction.
Editor of security measures
Protective measures
Respiratory system protection: when it is possible to contact the dust, the proposed wear self absorption filter type dust mask.
Eye protection: wear chemical safety goggles when necessary.
Protective clothing: wear anti acid and alkali resistant work clothes.
Hand protection: wear rubber gloves.
Other: smoking, eating and drinking water, before meals to wash their hands before meals. Shower and change clothes. Pay attention to personal hygiene. [
Leakage treatment
Leakage: the separation of pollution area, restricted access. Dai Zixi filter type dust mask for emergency treatment personnel, wearing anti acid and alkali resistant work clothes. Don't touch the leak.
Small leak: avoid dust, with a clean shovel to collect in the dry, clean, covered in the container.
Large amount of leakage: spray water control dust, protection personnel. [3]
Fire extinguishing method
Burning: not burning
Fire extinguishing agent: dry powder, carbon dioxide, sand. [3]
Emergency treatment
Inhalation: quickly from the scene to the fresh air. Maintain airway patency. If breathing is difficult, give oxygen. If the breath stops, immediately carry out artificial respiration. Medical treatment.
Ingestion: oral intake of water gargle, to drink milk or egg white. Medical treatment.
Skin contact: immediately remove contaminated clothing, the first use of vegetable oil and mineral oil wash, and then rinse with a large number of mobile water. Medical treatment.
Eye contact: immediately lift the eyelids, with large flow of water or saline rinse and seek medical treatment. [3]
5.
Health hazard
Invasive approach: inhalation, ingestion.
Health hazards: This product is a basic oxide, react with water in the human body generated alkali calcium hydroxide and release a lot of heat and irritation and corrosion. The respiratory tract has a strong irritant, inhalation of dust can cause chemical pneumonia. Eye and skin irritant, can cause burns. Oral irritation and burns. Long term exposure to this product can cause chapped skin keratosis, palm, finger deformation (Shi Jia).
Toxicological data and environmental behavior
Hazardous properties: a violent reaction with acids. Has a strong corrosive.
Combustion (decomposition) products: calcium oxide.
Can stimulate the mucous membrane, cause sneezing, in particular, can make the fat from the skin to absorb moisture, dissolved protein, stimulation and corrosion tissue. [
Note editor
A long time, calcium oxide in the air exposure will absorb carbon dioxide into powdered calcium carbonate to pond sterilization effect. Because this is the best use of lime in this life is now to buy, and choose a lighter, not containing impurities for good. If you use the rest of the raw lime with a plastic bag to seal the bar.
2, calcium oxide to join the pulp while still hot splashing, avoid residue into the pool, in order to avoid the fish in the moat while eating death, but not the whole lime thrown into the pool for water disinfection.
3, oxidation of calcium and nitrogen fertilizer at the same time application. Lime water meets generated lots of Oh, NH ++OH- = NH - H O balance to the right, the ammonia content high easy to cause fish ammonia poisoning. Similarly, the ammonia content of the water is higher than 1.2 mg / L, also should not be placed with lime. The application of ammonium nitrogen fertilizer after a week before the use of lime, do not mix.
4, calcium oxide and phosphate can not mix. Application of phosphate inorganic phosphate at pH is 6.5 ~ 7.5 with HPO 2, H Po form exists, if and lime mixed in pH greater than 7.5, generated by the reaction of Ca (PO) and enable effective phosphorus is easy to form calcium salt precipitation and loss. The general application of lime after at least every 10 to 15 days to P.
5, calcium oxide and not bleach, Qianglujing and halogen drugs mixture. Because of bleaching powder for acidic drugs, lime alkaline drugs, if the mixture of acid-base neutralization, directly reduce the disinfection efficacy.
Storage transportation
1, transport note: shipment to complete the packing, loading should be safe. Transport process to ensure that the container does not leak, do not collapse, do not fall, not damaged. Is strictly prohibited and flammable or combustible, acids, edible chemicals mixed mixed transport. Transportation vehicles should be equipped with emergency handling equipment. Rainy days should not be transported; [7]
2, storage note: store in a cool, ventilated warehouse. The humidity in the reservoir is preferably not more than 85%. Packaging must be completely sealed to prevent moisture absorption. Should be easy (can) fuel, acids and other separate storage, avoid by all means of mixing. The reservoir should be equipped with suitable material to contain the leakage.