Method for testing magnesium oxide in talcum powder

Abstract

The invention relates to a method for testing magnesium oxide in talcum powder. The method specifically comprises the following steps: putting a certain amount of the talcum powder into a nickel crucible, adding a corresponding amount of solid NaOH, smelting in a muffle furnace of 700-750 DEG C, acidizing through hydrochloric acid and performing complexometric titration through an ethylene diamine tetraacetic acid (EDTA) standard solution. In the titration process, interference of Fe ions, Al ions and Ni ions as the nickel crucible is used can be prevented by taking a triethanolamine solution together with phenanthroline as a masking agent. The method is simple and convenient to operate, accurate in testing result and both economical and time-saving.

Description

technical field [0001] The invention relates to a method for determining magnesium oxide components in talc powder. Background technique [0002] Talc powder is a very important raw material, its main component is hydrated magnesium silicate, the molecular formula is Mg 3 [Si 4 o 10 ](OH) 2 . Therefore, the content of silicon dioxide and magnesium oxide are two important indicators for evaluating talc powder. At present, the literature shows that the determination method of silicon dioxide has been reported, but there is only a national standard method for the determination of magnesium oxide. The national standard method has the following deficiencies: [0003] (1) The melting process of talcum powder is cumbersome and complicated, which is time-consuming and prone to errors during the operation, which reduces the accuracy of the measurement results. [0004] (2) Use a platinum crucible to melt talc powder. This is because the chemical properties of platinum are stab...

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Problems solved by technology

[0004] (2) Use a platinum crucible to melt talc powder. This is because the chemical properties of platinum are stable and can withstand molten alkali metal carbonate, which has no effect on the determination of magnesium oxide. However, platinum is expensive and difficult to detect under general laboratory conditions. obtained, which limits its use to some extent

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