Granular quicklime

Lime stabilization originated in Texas after World War II, and now it is used throughout the world. Lime is most commonly applied at a 4 wt % application or ca 11 kg/m (20 Ib/yd ) for 15 cm of compacted depth. It can be applied dry as hydrated time or granular quicklime or as a wet slurry. Distribution of the latter form is dusfless. Copious amounts (as much as 5—10%) of water are always needed in excess of the optimum moisture content of the soil. Then, a requisite for success is intimate mixing with a rotary mixer, followed by compaction to a minimum of 95% Proctor density. 

Granular quicklime, 75 27 Granular resins, 73 291-292 fabrication of, 73 299-300 Granulated sugar, refined, 23 481 Granulation, 70 272-273... 

Sheeted tipper waggons or covered rail hoppers are generally the most economical form of transport for lump and granular quicklimes which have been screened to remove the fines (e.g. < 5 mm particles). Air pressure discharge vehicles are used for fines and ground lime products and may also be used on product with a top size of up to 20 mm. Intermediate Bulk Containers are also used. 

Granular quicklime usually refers to screened products with a top size of above 0.6 cm and below 2.5 cm. 

In Germany and Japan, pulverized quicklime is used in making self-fluxing sinters, partially replacing limestone. Granular dead-burned dolomite is stiU used to protect the refractory lining of open-hearth and electric furnaces, but not the basic oxygen furnace. Refractory time has declined with the... 

In dry slaking calcium hydroxide is obtained as a dry powder. Use is made of the fact that so much heat is produced by the reaction of calcium oxide with water that the amount of water bound is approximately equal to that which can be evaporated. The so-called reactivity of the quicklime influences the product quality. Highly reactive lime leads, upon slaking, to a granular material, which has to be ground again. 

Skip hoists can be used for all granular and lump grades but are more suitable for particles greater than 100 mm. Elevators — both belt-and-bucket and chain-and-bucket types — have been used for all grades of quicklime. The system should minimise spillage within the equipment and ensure that wear on linkages caused by the quicklime is minimised. 

Iron and steelmaking. As mentioned above, in many industrialised countries, the major use of quicklime, including calcined dolomite, is in steelmaking. While most of the lime is in granular form, modern developments require ground quicklime. Calcined dolomite is also used for the refractory linings of the vessels. 

Ground" refers to pulverised high-calcium quicklime, lump" refers to granular high-calcium quicklime, hydrate" refers to hydrated high-calcium lime and milk" refers to milks of lime % values are by mass. 

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. 

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