Flaked calcium chloride

Flake calcium chloride that is dissolved in water at the ready-mix plant by some concrete producers. 

Most admixtures are supplied as a liquid. Liquid admixtures are generally considered easier to dispense accurately and more readily dispersible evenly through the mix. Where an admixture is supplied in powder form it is normally added to the dry batch prior to mixing but in the case of powder or flake calcium chloride it should be carefully and thoroughly dissolved in water before use. 

Figure 2.44 Typical flaked calcium chloride (Dow, 2001, courtesy of The Dow Chemical Company).

The most common of the solidification methods is to form flaked calcium chloride by having a cooling roll dip into a tray of the hot liquid, as noted above, or spreading the hot solution onto the top of the cooling roll. The solidified sheet... 

Figure 2.54 Typical Flaked Calcium Chloride Process. (Pittsburgh Plate Glass Co. [Allen]...

Allen, R. M., and Walton, R. J. (1963). Method of Making Flaked Calcium Chloride, Pittsburgh Plate Glass. U.S. Patent No. 3071816, 6 pp. 

Asahi Glass Co. (1982). Corrosion Protection in Flaked Calcium Chloride Production. Japanese Patent... 

Zaikin, A. P., and Stankevich, A. 1. (1981). Improved Cooling of Flaked Calcium Chloride. Khim. Tekhnol (Kiev) 2, 8-10. 

Calcium Chloride. Distiller waste Hquor from synthetic plants can be evaporated in multiple effect evaporators, precipitating residual sodium chloride. The resulting mother Hquor is then further evaporated to a molar ratio of lCaCl2 2H20 and cooled to produce flakes that are dried in rotary or... 

White crystal, powder or flake highly hygroscopic the compound and its solutions absorb moisture from the air at various rates depending on calcium chloride concentrations, relative humidity and vapor pressure of water in the air, temperature, surface area of exposed material, and the rate of air circulation at 40% and 95% relative humidity and 25°C, one gram anhydrous calcium chloride may absorb about 1.4 g and 17 g water, respectively. (Shearer, W. L. 1978. In Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., vol. 4, pp. 432-6. New York Wiley Interscience) density 2.15, 2.24, 1.85, 1.83 and 1.71 g/cm for the anhydrous salt and its mono-, di-, tetra- and hexahy-drates, respectively anhydrous salts melts at 772°C, while the mono-, di-, tetra- and hexahydrates decompose at 260°, 175°, 45.5° and 30°C, respectively the anhydrous salt vaporizes at 1,935°C highly soluble in water, moderate to high solubility in alcohol. 

Deicing. All forms of calcium chloride are used in conjunction with other products to deice pavement, driveways, and sidewalks. Anhydrous, 94—97 wt % calcium chloride pellets and 77—80 wt % calcium chloride flakes are used for highway deicing and in institutional and consumer markets. Calcium chloride solutions of 28—32 wt % concentration are used for prewetting rock salt or abrasives such as sand or cinders before spreading on highways. Solutions of 42—45 wt % concentration are also used to pretreat stockpiles of these materials. Calcium chloride is the deicer of choice for use at... 

Rotary multitray dryer pulverized coal, pectin, penicillin, zinc sulfide, waste slude, pyrophoric zinc powder, zinc oxide pellets, calcium carbonate, boric acid, fragile cereal products, calcium chloride flakes, caffein, Inorganic fluorides, crystals melting near 100°F, prilled pitch, electronic grade phosphors, and solvent-wet organic solids... 

Dowflake [Dow]. TM for calcium chloride, 77-80%, in a special flake form. 

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