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\nchalk, and oyster shell. Cement plants account for nearly half the demand while more than two hundred lime plants in the
\nUnited States and Puerto Rico consume about twenty five percent. Since the chemical composition of the limestone or
\nother sources of calcium is critical in the cement and the lime industry, particularly for the deleterious compounds such as
\nNa2O, MgO, P2O5, and K2O, accurate determinations are critical. Due to the tonnage per hour, these determinations must
\nbe made rapidly and accurately. X-ray fluorescence can thereby satisfy this need for accuracy and precision.
\nProduction of lime is performed by calcining limestone and the industry is generally located and concentrated in the
\nStates of Michigan, Pennsylvania, and Missouri. The resulting product is quicklime-CaO, or hydrated lime-Ca(OH)2.
\nSubstantial amounts of quicklime is further processed into calcium carbide in order to produce acetylene gas. In this case,
\nthe determination of P2O5 is critical since minor amounts of phosphorous in the acetylene gas can cause premature
\nexplosions. Other uses for lime are well known in the treatment of water, the paper and pulp industry, and the steel
\nindustry for the production of slag to remove impurities. Dolomitic lime is heavily utilized in the manufacture of
\nmagnesite refractories by reacting the dolomitic lime with brines from the Michigan basin to produce MgO and CaCl2.
\nSample preparation for these materials has been performed by grinding and pelletizing or fusion with Li2B4O7. In
\naddition to the chemistry, matrix and interelement effects will be discussed as related to the chemical analysis by X-ray
\nfluorescence.
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