Method for continuous determination of calcium oxide and magnesium oxide content of limestone and dolomite

Abstract

The invention discloses a method for continuous determination of calcium oxide and magnesium oxide content of limestone and dolomite. The method comprises adding a limestone or dolomite sample into a Teflon plastic beaker, preparing a blank contrast without the limestone or dolomite sample, respectively adding hydrochloric acid and nitric acid-hydrofluoric acid into the beakers to dissolve the sample, adding perchloric acid into the beakers to produce smoke, adding hydrochloric acid into the breakers, carrying out salt heating dissolution, transferring the reagents into a big volumetric flask, carrying out dilution until the liquid level reaches to the scale and metered volume is obtained, dividing each solution in the sample and blank contrast into two parts with the same amount, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, a potassium hydroxide solution and calcein into one part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the fluorescent green color disappears, recording the volume, calculating calcium oxide content, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, an ammonia-ammonium chloride buffer solution and an eriochrome black T indicator into the other part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the prunosus color is changed into a blue color, recording the volume and calculating magnesium oxide content.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a continuous determination method for measuring calcium oxide and magnesium oxide in limestone and dolomite by volumetric method. Background technique [0002] Lime and limestone are used in large quantities as building materials and as important raw materials for many industries. Limestone can be directly processed into stone and fired into quicklime, which includes quicklime and slaked lime. The main component of quicklime is CaO, which is generally lumpy, pure white, and light gray or light yellow when it contains impurities. Quicklime absorbs moisture or adds water to become slaked lime, slaked lime is also called slaked lime, and its main component is Ca(OH) 2 . Slaked lime is formulated into lime slurry, lime paste, lime mortar, etc., which are used as coating materials and brick adhesives. Cement is made by mixing limestone and clay and calcining at high temperature...

AI Technical Summary

Problems solved by technology

Solve the problem of long process and high cost of existing analysis methods

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