Method for determining iron, aluminum and silicon in silica simultaneously

Abstract

The invention relates to a method for determining iron, aluminium and silicon in silica simultaneously. The method comprises the following steps that a silica sample is burned to reach the constant, hydrofluoric acid and nitric acid are added for dissolving, silicon is removed through evaporation to dryness and volatilization, and fluorine is expelled with nitric acid; burning is conducted to reach the constant at 1,050+ / -50 DEG C, and the difference between two weighing is the silicon dioxide quantity; residues obtained after silicon dioxide is determined is fused with a mixed solvent, leaching is conducted with diluted hydrochloric acid, a leaching solution is neutralized with ammonium hydroxide, high valence metal ions are made to form hydroxide precipitates, burning is conducted, and sesquioxide is generated and weighed; precipitates determining sesquioxide is fused with potassium pyrosulfate, after leaching and dissolving are conducted with hydrochloric acid, reduction is conducted with stannous chloride to reach light yellow, sodium tungstate serves as an indicator, residual ferric iron is reduced with titanium trichloride, at last, sodium diphenylamine sulfonate serves as anindicator, titration is conducted with a potassium dichromate standard titration solution, and the content of iron sesquioxide is measured. The determination method has the advantages of being shortin operation procedure, high in efficiency and stable and accurate in result.

Description

technical field [0001] The invention relates to the field of element detection, in particular to a method for simultaneous determination of iron, aluminum and silicon in silica. Background technique [0002] Silica is widely found in nature and forms rocks together with other minerals. Naturally occurring silicon dioxide, also called silica, is a hard, refractory solid. [0003] Silica is the main raw material of siliceous refractories. Silica is mainly used in acid refractory bricks in the metallurgical industry. [0004] Potassium fluorosilicate method is commonly used for the determination of silicon, acid-base titration after filtering the precipitate. The operation of the method is relatively complicated and difficult to master. The ICP method can be used for the simultaneous determination of multiple elements, but the cost of equipment purchase and maintenance is high, and the requirements for the laboratory determination environment are relatively high. Contents...

AI Technical Summary

Problems solved by technology

The method operation is relatively complicated and difficult to master

The ICP method can be used for the simultaneous determination of multiple elements, but the cost of equipment purchase and maintenance is high, and the requirements for the laboratory determination environment are relatively high.

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