Burnt lime CaO

Maintenance of conditions ia the culture environment that keep stress to a minimum is one of the best methods of a voiding diseases. Vacciaes have beea developed agaiast several diseases and more are under development. Selective breeding of animals with disease resistance has met with only limited success. Good sanitation and disiafection of contaminated faciUties are important avoidance and control measure. Some disiafectants are Hsted ia Table 6. Poad soils can be sterilized with burnt lime (CaO), hydrated lime [Ca(OH)2], or chlorine compounds (12). 

Calcium Oxide n (ca. 1885) (calx, lime, quicklime, burnt lime) CaO. A white powder with affinity for water, with which it combines to form calcium hydroxide. It has been used to remove traces of water in vinyl plastisols. Also known as Quicklime. 

Figure 3.27. Shaft kiln for lime burning the raw material is natural cal-cite CaCO that will calcine and transform into burnt lime CaO when heated above 800°C.

Natmal occmrence of calcium carbonate CaCOs is used as raw material for producing burnt lime CaO(s) and calcium hydroxide Ca(OH)2(s), which are used as binders in lime mortar for masomy. Calcium carbonate can exist in two modifications a hexagonal form, calcite ( calcspar ) and a rhombic form aragonite. In his book The... 

The chemical formula for limestone is CaCOj and upon burning forms calcium oxide (CaO), which is known as burnt lime. Calcium oxide, when mixed with water, forms calcium hydroxide (Ca(OH)2). Calcium hydroxide is used to treat water as a coagulation aid along with aluminum sulfate. 

Calcium Oxide (lime, Quicklime, Burnt Lime, Calx, Unslaked Lime, Fluxing Lime). CaO, mw 56.08, white or greyish-white lumps or powd, mp 2580°, bp 2850°, d 3.25-3.40g/cc. SI sol in w with formation of calcium hydroxide and evolution of large amts of heat sol in acids, and insol in ethanol. Coml prepn consists of heating calcium carbonate in kilns at 1000—1100° until all of the C02 is driven off. Lab prepn is by burning calcium carbonate or calcium oxalate at about 800° using a quartz crucible in an electric furnace... 

Calcium Oxide. Lime burnt lime calx quicklime. GO mol wt 56.08. Ca 71.47%, O 28.53%. Properly stored line of commerce contains 90-95% free CaO. Commercial production from limestone W. L. Faith et al. Industrial Chemicals (John Wiley, New York, 3rd ed, 1965) pp 482-411. Ub prepn by ignition of CaCO, Ehrlich in Handbook si Preparative Inorganic Chemistry ml. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 931. Review R, S. Boynton in Kirk -Othmer Encyclopedia of Chemical Ttthealogy voL 14 (Wiley-Interscience, New York, 3rd ed.. Iffl) pp 343-382. 

Brock mentions the use of burnt lime and water as a heat source for food cans. This reaction furnishes 0.26 kcal/g of calcium oxide (CaO), and w4iile not exactly classifiable as pyrochemical is said to be abk to produce a temperature as high as 450°C—enough to set fire to guncotton, sulfur, wood, and sometimes straw. ... 

Expansive cements based on calcium oxide are in essence Portland cemerrts with a content of hard-burnt free lime in amounts high enough to produce the reqrrired expansion. In principle, such a cement may be produced either by btrming the cemerrt raw meal in a way that results in the desired free CaO content in clinker, or by adding to a cement with a normal (that is, low) free lime content additional amounts of caldrrm oxide in the form of hard-burnt lime. To produce a distinct expansion of a Portlarrd cement paste the free CaO contents must lie typically above about 2-3 wt%. 

Calcium oxide, CaO, is generally produced in die form of crystals, white or greyish white lumps or a granular powder. Commercial material may have a yellowish or brownish tint, due to die presence of iron MerckIndex, 1996). It is also known as lime (. v.), burnt lime, calx and quicklime. 

Lime as quicklime CaO is obtained from natural limestone or dolomite burnt in temperature between 950°C and 1,100°C. The slacked lime obtained... 

---