calcium oxide, not obtained by calcining natural materials
Calcium oxide (99.95%-Ca)
Calcium oxide powder
calcium oxygen(-2) anion
|Physical and Chemical Properties||Character White cubic powder. Industrial products often contain impurities such as magnesium oxide, aluminum oxide and iron oxide and dark gray, light yellow or brown. |
melting point 2614 ℃
boiling point 2850 ℃
relative density 3.25~3.38
soluble in acid.
|Use||For the manufacture of calcium carbide, soda ash, bleaching powder, etc., but also for leather, wastewater purification|
|Hazard Symbols||C - Corrosive|
|Risk Codes||R34 - Causes burns|
|Safety Description||S25 - Avoid contact with eyes.|
S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection.
S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
|UN IDs||UN 1910|
|Raw Materials||Calcium carbonate|
|Downstream Products||Calcium hydroxide|
Calcium nitrate anhydrous
Calcium bis(dihydrogen phosphate)
White crystalline lumps or granules, powder. Melting point 2572 ℃; Boiling point 2850 ℃;d 3.32~3 35. Soluble in acid, glycerol, sugar solution, water-soluble, insoluble in ethanol. Easy to absorb carbon dioxide and moisture in the air. Calcium hydroxide is formed in contact with water and a large amount of heat is released. There are no specific combustion and explosion characteristics. It has strong corrosion. With acid substances can occur violent reaction.
This product shall be calculated by burning to constant weight, and the CaO content shall not be less than 98.0%.
limestone calcination method: limestone is coarse-crushed to 150mm, and fine slag of 30 to 50mm or less is removed by sieve. Anthracite or coke required particle size of less than 50mm, which contains low melting point ash should not be too much, the addition of anthracite or Coke is 7.5% to 8.5% of limestone. The screened limestone and fuel are added into the kiln from the top of the kiln regularly and quantitatively, calcined at 900~1200 ℃, and then cooled to obtain a finished product. In the calcination process by-product carbon dioxide.
Analytical reagents. For the preparation of high purity calcium salt, carbon dioxide absorbent, the preparation of the fluorescent powder flux and vegetable oil decolorizing agent. Can also be used in electronics, instrumentation, metallurgical industry.
This product is a strong alkali, irritation and corrosion. Has a strong irritation to the respiratory tract, inhalation of this product dust can cause chemical Pneumonia. Eye and skin have a strong irritation, can cause burns. Oral irritation and Burns of the digestive tract. Staff should be protected and immediately rinsed with running water after touching the eyes and skin. Store in a cool, ventilated warehouse. Prevent moisture and rain. Do not mix with acids for storage and transportation. When fire occurs, dry powder, carbon dioxide and dry sand should be used to extinguishing the fire.
Take 5.0g of this product, add several drops of water to wet it, then add water to lOOrnl, stir well, adjust to acid with hydrochloric acid, add hydrochloric acid to lm l, and boil for 5 minutes, filter with No. 4 vertical melting glass Crucible dried to constant weight at 105, and wash the filter residue with boiling water until the washing solution and silver nitrate solution are not turbid. Dry to constant weight at 105, and the remaining residue shall not pass through 10 .0m g(0 .2%).
take l .O g of this product, add a few drops of water to wet, then add 50ml of water, stir, add an excess of dilute nitric acid, no bubbles.
take 1.0g of this product, Add 75ml of water to dissolve, adjust to acidic with hydrochloric acid, add 1 ml of human hydrochloric acid, boil for 1-2 minutes, add human ammonia test solution to neutralize, add excess ammonium oxalate test solution, heat on a water bath for 2 hours, let it stand cold, add water to 200ml, stir well, filter, take 50ml of filtrate, add 0.5ml of sulfuric acid, evaporate on a water bath, flash to constant weight at 600C, the remaining residue should not exceed 15mg.
take this product l.O g, check according to law (General rule 0841), burn to constant weight at 900°C, loss of weight shall not exceed 10.0%.
take 0.4g of this product, weigh it accurately, put it in 250ml measuring flask, add hydrochloric acid solution (l -3 ) 8 m l, ultrasonic treatment (about 10 minutes) to dissolve, cool, dilute to the scale with water, shake well, take 10ml precisely, add 50ml of water and 2 m l of 8 m o L/l potassium hydroxide solution, and add 5mg of calcium carboxylic acid indicator, with ethylenediamine tetraacetic acid disodium titration solution (0. 02mol/L) titration to the solution from red wine to blue-green. Each l of l of ethylenediamine tetraacetic acid sodium titration solution (0.02 mol/L) is equivalent to 1.122 mg of CaO.
pharmaceutical excipients, diluents and alkalizing agents.