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Calcium oxide

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CAS:1305-78-8
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CAS:1305-78-8
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CAS:1305-78-8
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Products Intro: Product Name:Calcium oxide, 98%
CAS:1305-78-8
Purity:98% Package:1kg;250g
Calcium oxide Basic information
Chemical properties Uses Content analysis Identification test Toxicity Production method Usage limitation Hazards & Safety Information
Product Name:Calcium oxide
Synonyms:bellcml(e);burnedlime;burntlime[qr];Calcia;calcia[qr];Calcium oxide (CaO);calciummonoxide[qr];calciumoxide(cao)
CAS:1305-78-8
MF:CaO
MW:56.08
EINECS:215-138-9
Product Categories:Inorganics;Biocompatible Ceramics;Biomaterials;Calcium;Catalysis and Inorganic Chemistry;Chemical Synthesis;metal oxide;nano structured metal oxide;Materials Science;Metal and Ceramic Science;Oxides
Mol File:1305-78-8.mol
Calcium oxide Structure
Calcium oxide Chemical Properties
Melting point 2570 °C
Boiling point 2850 °C(lit.)
density 3.3 g/mL at 25 °C(lit.)
refractive index 1.83
Fp 2850°C
storage temp. Store at RT.
solubility 1.65g/l Risk of violent reaction.
form powder
color White to yellow-very slightly beige
PH12.6 (H2O, 20℃)(saturated solution)
Water Solubility REACTS
Sensitive Air & Moisture Sensitive
Merck 14,1686
Stability:Stability Stable, but absorbs carbon dioxide from the air. Incompatible with water, moisture, fluorine, strong acids.
CAS DataBase Reference1305-78-8(CAS DataBase Reference)
NIST Chemistry ReferenceCalcium monoxide(1305-78-8)
EPA Substance Registry SystemCalcium oxide (CaO)(1305-78-8)
Safety Information
Hazard Codes C,Xi
Risk Statements 34-41-37/38
Safety Statements 26-36/37/39-45-25-39
RIDADR 1910
WGK Germany 1
RTECS EW3100000
10-21-34
TSCA Yes
HazardClass 8
PackingGroup III
HS Code 28259019
Hazardous Substances Data1305-78-8(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
Calcium oxide Usage And Synthesis
Chemical propertiesIt appears as white cubic crystalline powder. Industrial products often contain magnesia, alumina and ferric oxide and other impurities so exhibit dark gray, light yellow or brown. It is soluble in acid.
Uses1.  Calcium oxide can be used in the manufacture of calcium carbide, soda ash, bleaching powder, used as building materials, refractoriness’, desiccant and soil conditioner and calcium fertilizer
2.  It can be used as an analysis reagent and flux agent for manufacturing fluorescence powder.
3.  It can be used in the manufacture of calcium carbide, soda ash, bleaching powder, also used for leather, waste water purification
4.  Calcium oxide can be used as building materials, metallurgical flux agent and the major raw materials for the manufacturing of calcium hydroxide and a variety of calcium compounds. It is also the inexpensive alkali in the chemical industry. It is widely used in pesticides, paper, food, petrochemical, leather, waste water purification and so on. It can also be used for the drying of the laboratory ammonia and alcohol dehydration.
5.  Use as drug carriers.
6.  Uses as analysis reagents; Calcium oxide can be applied to steel, pesticides, pharmaceuticals, non-ferrous metals, fertilizers, leather and manufacturing of calcium hydroxide, drying of laboratory ammonia, carbon dioxide absorbent and alcohol dehydration.
Content analysisApproximately 1 g of the sample was burned to constant weight (accurately weighed) and dissolved in 20 ml of dilute hydrochloric acid solution (TS-117). After cooling, dilute to 500.0ml with water and mix uniformly. Take 50 mL of this solution into the appropriate container, add 50ml of water. Add 30 mL 0.05ml/L disodium EDTA via a 50 mL burette with stirring (preferably with a magnetic stirrer); further add 15ml sodium hydroxide solution (TS-224) and hydroxy naphthol blue indicator (300 mg) for continue titration to the blue end. Per ml of 0.05 mol/L of EDTA corresponds to 2.804 mg of calcium oxide.
Identification test1 g of the sample was shaken with 20 ml of water, and the acetic acid test solution (TS-1) was added to dissolve the sample. The calcium test (IT-10) of this solution was positive.
ToxicityADI is not subject to restrictive regulations (FAO/WHO, 2001).
GRAS (FDA, §18.5210; §184.12l0, 2000);
See Calcium Oxide.
It can stimulate the mucous membrane, causing sneezing, in particular, can cause fat saponification so the water will be absorbed by the skin, dissolving the protein with stimulating and corroding the tissue. It has strong effect against the eye mucosa, being able cause oral and nasal mucosa superficial ulcers, and sometimes there may be perforation of the nasopharyngeal diaphragm, deep respiratory tract disease. Inhalation of lime dust may cause pneumonia.
In case of inhalation of dust, it can be treated via inhaling water vapor (add some of the citric acid crystals to the water in advance) and coat the mustard cream in the chest. If falling into the eyes, we can open up the eyes and immediately rinse with running water for 10~30 min and then rinse with 5% ammonium chloride solution. When the skin burns, it can be used with 5% citric acid, tartaric acid, acetic acid or salt solution of mineral oil or vegetable oil to remove the lime residue sticking to the skin.
The maximum allowable concentration in the United States is 5 mg/m3.
During operation, it should be paid attention to the protection of respiratory organs. Wear uniforms manufactured using dust-proof fiber, gloves and closed dust-proof glasses. Coat the ointment-containing grease. Clean after work. During the preparation and application, it should be prevented of dust inhalation.
Production methodCalcium carbonate calcination first apply calcium carbonate for reaction with hydrochloric acid to generate calcium chloride, followed by addition of ammonia for neutralization, standing for precipitation and filtration, followed by adding sodium bicarbonate for reaction to generate calcium carbonate precipitate. It is further subject to centrifugal separation dehydration, drying and calcination, followed by crushing and screening to obtain the finished product of medicinal calcium oxide. Its reaction is:
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
CaCl2 + 2NH3? H2O? Ca (OH) 2 + 2NH4Cl
Ca (OH) 2 + NaHCO3 → CaCO3 + NaOH + H2O
CaCO3 [△]→CaO + CO2 ?.
Limestone calcination method: crush the coarse limestone to 150 mm, and screen for the fine residue below 30 to 50 mm. Anthracite or coke required a particle size to be below 50 mm, which contains not too much low melting point ash content. The amount of anthracite or coke is 7.5% to 8.5% of that of limestone by weight. The selected limestone and fuel are timely and quantitatively supplied from the kiln crown to the kiln, further calcinated at 900~1200 ℃ and then lead to the finished product after cooling. In the calcination process, carbon dioxide is produced as by-product. Its reaction equation is:
CaCO3 [△]→CaO + CO2 .
Usage limitationGB 14880-94 (in terms of Ca, g/kg): beverages, cereals and their products, 1.6~3.2; infant food, 3.0~6.0.
GB 2760-2001: Preparation of water 100mg/L (36mg/L in terms of Ca).
Hazards & Safety InformationCategory Corrosive items
Toxic classification poisoning
Acute toxicity Intraperitoneal-mouse LD50: 3059 mg/kg
Explosive and hazardous properties it is corrosive to the skin; powdered calcium oxide can be mixed with water to be explode; its mixture with alcohol can be flammable and explosive upon heating
Flammable hazardous characteristics exothermic upon water with its heat being able to cause organic combustion; one of the air pollutants with heating together with alcohol mixture being able to cause combustion
Storage and transportation characteristics Treasury: Ventilated, low temperature and drying; Store separately from combustible materials, acids and phosphorus pentoxide.
Fire extinguishing agent mist water, sand
Occupational Standard TLV-TWA 2 mg/m3; STEL 5 mg/m3
DescriptionCalcium oxide (CaO, CAS Reg. No. 1305-78-8) is also known as lime, quick lime, burnt lime, or calx. Lime does not occur naturally since it reacts so readily with water (to form hydrated lime) and carbon dioxide (to form limestone). It is produced from calcium carbonate, limestone, or oyster shells by calcination at temperatures of 1,700-2,450℃.
Calcium Oxide is a solid with a very high affinity for water - it will react with water in the air, or in your skin or anywhere it can and form calcium hydroxide. This reaction is exothermic so it releases a lot of heat while it is reacting - there fore as well as being corrosive and causing significant skin irritation, calcium oxide's reaction with water can also cause burns. Calcium hydroxide is basically hydrated calcium oxide. It is alkali so can be corrosive. In solution it makes limewater.
CaO is not found pure in nature but rather is contained in various abundant minerals (i.e. calcite, aragonite, limestone, marble) but vary greatly in their purity (impurities usually include magnesia, iron, alumina, silica, sulfur). Of these iron and sulfur are most troublesome (i.e. where clarity is important in glass). Lime minerals vary in the degree of crystallization and cohesion of the crystalline mass and the homogeneity of the matrix.
Calcium oxide is the principle flux in medium and high temperature glazes, beginning its action (within the glaze) around 1100C. It must be used with care in high-fire bodies because its active fluxing action can produce a body that is too volatile (melting if slightly overfired).
Lime, or calcium oxide, is a principle ingredient in the production of Portland cement, the basis for most mortars and concrete. Hydrated or ‘slaked’ lime is the chemical calcium hydroxide. This chemical is also used in mortars. Both types of lime are strong bases and are also used in food production (calcium hydroxide is commonly used in making corn tortillas), petroleum refining and sewage treatment. In the household it is used by aquarium hobbyists to add bioavailable calcium to fish tanks. It is also found in hair relaxers.
Chemical Propertieswhite to grey solid
Chemical PropertiesCalcium oxide, CaO, occurs as white or grayish-white lumps or granular powder. The presence of iron gives it a yellowish or brownish tint.
UsesCalcium Oxide is a general food additive consisting of white granules or powder of poor water solubility. it is obtained by heating limestone (calcium carbonate) in a furnace. it is also termed lime or quicklime. it is used as an anticaking agent, firming agent, and nutritive supple- ment in applications such as grain products and soft candy.
DefinitionChEBI: A member of the class of calcium oxides of calcium and oxygen in a 1:1 ratio.
UsesIn bricks, plaster, mortar, stucco and other building and construction materials; manufacture of steel, aluminum, magnesium, and flotation of non-ferrous ores; manufacture of glass, paper, Na2CO3 (Solvay process), Ca salts and many other industrial chemicals; dehairing hides; clarification of cane and beet sugar juices; in fungicides, insecticides, drilling fluids, lubricants; water and sewage treatment; in laboratory to absorb CO2 (the combination with NaOH is known as soda-lime, q.v.).
General DescriptionAn odorless, white or gray-white solid in the form of hard lumps. A strong irritant to skin, eyes and mucous membranes. Used in insecticides and fertilizers.
Air & Water ReactionsCrumbles on exposure to moist air. Reacts with water to form corrosive calcium hydroxide, with evolution of much heat. Temperatures as high as 800° C have been reached with addition of water (moisture in air or soil). The heat of this reaction has caused ignition of neighboring quantities of sulfur, gunpowder, wood, and straw [Mellor 3: 673 1946-47].
Reactivity ProfileA base and an oxidizing agent. Neutralizes acids with generation of heat. Nonflammable, but will support combustion by liberation of oxygen, especially in the presence of organic materials. Reacts very violently with liquid hydrofluoric acid [Mellor 2, Supp. 1:129 1956]. Reacts extremely violently with phosphorus pentaoxide when reaction is initiated by local heating [Mellor 8 Supp.3:406 1971].
HazardEvolves heat on exposure to water. Danger- ous near organic materials. Upper respiratory tract irritant.
Health HazardCauses burns on mucous membrane and skin. Inhalation of dust causes sneezing.
Fire HazardNon-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
Safety ProfileA caustic and irritating material. See also CALCIUM COMPOUNDS. A common air contaminant. A powerful caustic to living tissue. The powdered oxide may react explosively with water. Mixtures with ethanol may igmte if heated and thus can cause an air-vapor explosion. Violent reaction with (I3203 + CaCl2) interhalogens (e.g., BF3, CIF3), F2, HF, P2O5 + heat, water. Incandescent reaction with liquid HF. Incompatible with phosphoms(V) oxide.
Potential ExposureCalcium oxide is used as a refractory material; a binding agent in bricks; plaster, mortar, stucco, and other building materials. A dehydrating agent, a flux in steel manufacturing, and a labora
ShippingUN1910 Calcium oxide, Hazard class: 8; Labels: 8-Corrosive material.
IncompatibilitiesThe water solution is a medium strong base. Reacts with water, forming calcium hydroxide and sufficient heat to ignite nearby combustible materials. Reacts violently with acids, halogens, metals.
Waste DisposalPretreatment involves neutralization with hydrochloric acid to yield calcium chloride. The calcium chloride formed is treated with soda ash to yield the insoluble calcium carbonate. The remaining brine solution may be discharged into sewers and waterways
Tag:Calcium oxide(1305-78-8) Related Product Information
Calcium oxide ETHYLENEDIAMINE TETRAKIS(PROPOXYLATE-BLOCK-ETHOXYLATE) TETROL Calcium citrate Calcium carbonate Calcium Propionate Calcium carbide 4-(Diethylamino)salicylaldehyde Diphenolic acid Soda lime granular,SODA LIME WITH,SODA LIME WITH INDICATOR, PELLETS, R. G.,SODA LIME, PELLETS, WITH INDICATOR, PS 2 -5 MM,SODA LIME GRANULAR +100 MESH A.C.S. &,SODA LIME REAGENT (ACS) 4-8 Mesh,SODA LIME, INDICATING REAGENT (ACS) 4-8 MESH,soda lime, acs,Ajax Soda Lime SL512 Spec. To DMS143B,Soda Lime, 4-8 Mesh, Reagent, Indicating, Reagent,SODA LIME, GRANULAR, WITH INDICATOR WHITE TO VIOLET,SODA LIME NO 1,Soda lime -not hygroscopic,SODA LIME NO 2,SODA LIME, INDICATING,SODA LIME,SODA LIME, IND Calcium chloride Calcium peroxide Pralmorelin CALCIUM OXIDE, HYDRATED Calcium stearate 5-Chlorovaleric acid Calcium nitrite Viridian 3B Vitamin E