Quick-lime

Moisture absorbents or desiccants are required. These are spread on trays and distributed throughout the boiler, so that circulating air passes over them. Quick lime (CaO) is used at 8 to 10 lb for every 1,000 lb/hr of steaming capacity. Alternatively, silica gel is used at 4 to 6 lb per 1,000 lb of steaming capacity. 

Lime is the old-fashioned name for calcium oxide. As a root, it is also found in lime stone (calcium carbonate), lime pits (burial sites for the poor, which were lined with CaO) and quick lime (calcium hydroxide). 

Solidification of the upper layers can be accomplished by blending pozzolanic additives, modified clay, or stabilization reagents into moist soil and compacting the mass. Pozzolanic additives include such fixatives as portland cement, quick lime,... 

The alcohols are freed from water by boiling under reflux for several hours with freshly ignited quick-lime and are then distilled. 

Calcium hydroxide [Ca (OH) ] is known as slaked or hydrated lime and is formed by exposing calcium oxide to water. Slaked lime is less caustic than quick lime. Therefore, it is used to line football fields. (Unslaked lime, CaO, is very caustic when wet, and if it is used on playing fields, players may receive caustic burns.) Calcium hydroxide has many uses, including as an ingredient for stonemasons mortar, cements, whitewash, and soil conditioner (high pH), as a food additive, and as a human depilatory. 

CALCIUM OXIDE Unslaked Lime, Quick Lime ORM - B, III 1 0 1 ... 

Bases (Caustics)—Sodium Hydroxide, Ammonium Hydroxide, Calcium Hydroxide (Slaked Lime), Calcium Oxide (Quick Lime)... 

Hence, added J. Black, we may safely conclude that the volatile matter lost during the calcination is mostly air, and hence calcined lime does not emit air or make any effervescence when mixed with acids. Again, lime becomes caustic owing to the loss of fixed air. Consequently, J. Black proved that Chalk=Quick-lime+Fixed air. Hence, quicklime is simpler than chalk or limestone. 

Residues of mercury fulminate are destroyed either by dissolving them in sodium thiosulphate or by covering them with quick lime and treating the mixture with live steam. 

It is employed in two states in the one case the apparatus is termed the wet lime purifier, from the lime being made into a cream with water, and used in this condition tho other is known as the dry lime purifier, in which quick lime, barely slaked, is resorted to. Their comparative efficiency is matter of dispute among gas-makers. 

Take for one pound of ore, or what you wish to melt, two pounds granulated lead, five Lot (2l/o oz) salt, five Lot sal alcali, a lye made from willow ashes and quick lime, five Lot corpus mortuus, that is the mud or residue from parting water, five Lot argol (tartar) and heat in a Viennese crucible, and cover it so that nothing unclean may fall into it, and let it fuse in the blast to a regulus (Konig) which then test. ... 

Quick lime Quick lime karabic Lead... 

Let me take a little quick-lime and pour some common water on to it—the commonest water will do. I will stir it a moment, then pour it upon a piece of filtering paper in a funnel, and we shall very quickly have a clear water proceeding to the bottle below, as I have here. I have plenty of this water in another bottle but, nevertheless, I should like to use the lime-water that was prepared before you, so that you may see what its uses are. If. I take some of this beautiful clear lime-water, and pour it into this jar, which has collected the air from the candle, you will see a change coming about. Do you see that the water has become quite milky Observe, that will not happen with air merely. Here is a bottle filled with air and if I put a little lime-water into it, neither the oxygen nor the nitrogen, nor anything else that is in that... 

Calcium oxide or quick lime is used in the treatment of soil. 

A stability test is made after 2 hours drying at 100 °C hi order to ascertain the drop in active chlorine content. A stable product manufactured in Moore s equipment shows a loss of 3.5 per cent while an unstable product about 14 per cent. From this we can see that although decomposition is suppressed to a considerable extent in the case of a stable product, the active chlorine loss is still noticeable. The so called superstable bleaching powder is prepared by the addition of quick lime to the stable product. A stability test then shows active chlorine loss to be less than 0.75 per cent. 

Admixes to the soil in stabilization process compound with the minerals and soil grains, and may lead to generation of new chemical mix with different properties in comparison with the primary properties of soil. Lime as an ordinary stabilizer compounds with soil in the form of quick-lime (CaO) or hydrated lime (Ca(OH)2) can improve soil physical properties [7]. 

Black, Joseph. Experiments upon Magnesia Alba, Quick-Lime, and other Alcaline Substances (read to Edinburgh Philosophical Society in 1755 published... 

Sucrose can be partly recovered from molasses by means of lime, strontia, or byryta processes. These processes are all based on the formation of insoluble saccharates. The process using dry lime as the precipitant is known as the Steffen process. About 95 percent of the sucrose is recovered from beet molasses. The diluted molasses is cooled to about 6°C and dry lime is added. The precipitated calcium saccharate is carbonated to reduce the lime content, filtered, and concentrated. About 90 percent of the sucrose can be recovered by the Steffen process. The calcium carbonate precipitated can be roasted and reconverted to quick lime. 

Joseph Black, Experiments upon Magnesia Alba, Quick-lime, and Other Alcaline Substances, Essays and Observations, Physical and Literary 2, 1756, 157-255. 

Heavy or moist dust (very heavy dust) Lead dust with small chips, moist cement dust, quick lime dust 4500 and up... 

I have made the experiment on the native carbonates of lime and barytes, but the gas did not decompose these bodies. This indeed might be expect, since quick-lime, I find, does not absorb the gas a cubic inch of it, exposed to the action of lime in a tube over mercury, was only diminished in two days to nine-tenths of a cubic inch, and no further absorption was afterwards observed to take place. But even this circumstance does not demonstrate that the gas has no afflnity for lime, and is not capable of combining with it for on making a similar experiment with carbonic acid, substituting this gas for the new compound, the result was the same in two days only about one-tenth of a cubic inch was absorbed. 

Oiled debris, beach material, and sorbents are sometimes disposed of at landfill sites. Legislation requires that this material not contain free oil that could migrate from the site and contaminate groundwater. Some governments have standard leach-ability test procedures that determine whether the material will release oil. Several stabilization processes have been developed to ensure that free oil does not contaminate soil or groundwater. One process uses quick lime (calcium oxide) to form a cement-like material, which can be used on roads as a dust-inhibitor. Another form of disposal is to process liquid oil in a bioreactor and thus attempt to break it down. This is usually not successful because of the many slowly degraded components in some oils. 

Waste stream metal loading can be reduced by hydroxide precipitation. Hydroxide precipitation uses lime or liquid sodium hydroxide as reactants to form insoluble metal hydroxide. Solids are settled, filtered, and removed as sludge. Liquid sodium hydroxide or quick lime are commonly used as precipitation reagents. Generally, lime is cheaper than other reagents, however, it has a higher operating cost because it is difficult to handle. 

Fuming sulphuric acid. Used as a smoke producer in WWI. Dripped onto a bed of quick lime much heat generated evaporation of the acid condensation into tine droplets, the acid is hygroscopic. Dense fog produced. 

When the calcium carbonate, CaC03, in limestone is heated to a high temperature, it decomposes into calcium oxide (called lime or quick lime) and carbon dioxide. Lime was used by tbe early Romans, Greeks, and Egyptians to make cement and is used today to make over 150 different chemicals. In another reaction, calcium oxide and water form calcium hydroxide, Ca(OH)2 (called slaked lime), used to remove the sulfur dioxide from smoke stacks above power plants burning bigb-sulflir coal. The equations for all these reactions are below. Determine the oxidation number for each atom in the equation and identify whether the reactions are redox reaction or not. For each redox reaction, identify what is oxidized and what is reduced. 

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