Calcium Chemical

Barium is a metallic element, soft, and when pure is silvery white like lead it belongs to the alkaline earth group, resembling calcium chemically. The metal oxidizes very easily and should be kept under petroleum or other suitable oxygen-free liquids to exclude air. It is decomposed by water or alcohol. 

C02. Unfortunately, S02 is less soluble (and hence less easily removed by scrubbing) in slightly acid solutions, so that it is extremely difficult in practice to operate a calcium-bascd system in such a manner that SO2 removal is maximized while the quantities of calcium chemicals are minimized in order to approach stoichiometric conditions. As calcium-based slurry systems are usually operated at pH 6-10, disposal of the very large masses of used slurry presents a major problem. A typical power station using a caldnm-based SO2-removal slurry system will produce several hundred tons of spent slurry per day. A further disadvantage of lime or limestone systems is their marked tendency to precipitate insoluble calcium salts inside the scrubber. Unless the scale is removed, the scrubber shortly becomes inoperable. 

Molecular-sieve zeolites are cry stall ins aluminosilicates of group IA and group IIA elaments such as radium, potassium, magnesium and calcium. Chemically, they are represented by the empirical formula ... 

PHOSPHIDES OF ZINC, ALUMINUM, OR CALCIUM Chemical structure and characteristics... 

Figure 8. Chart of calcium chemical shifts. As for Mg, infinite dilution shifts are often difficult to estimate see for example the plots for CaCl2 or Ca(C104)2 in methanol. ...

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