Method for determining effective aluminum and activated silicon in gibbsite bauxite

Abstract

The invention relates to a method for determining effective aluminum and activated silicon in gibbsite bauxite. The method comprises the following steps of putting a weighed sample into a digestion tank of a closed microwave digestion instrument, adding a sodium hydroxide solution for digestion, transferring a digestion solution into a beaker containing hydrochloric acid after digestion is completed, heating the breaker to micro-boil and dissolve hydrated sodium aluminosolicate therein, transferring the solution to a volumetric flask for constant volume after cooling, mixing evenly, clarifying and absorbing 10mL of solution to a 100Ml volumetric flask; and adding 10mL of 6mol/L HCl, diluting the HCl to constant volume by using distilled water, mixing evenly, determining the content of distilled aluminum and activated silicon by using an inductively coupled plasma atomic emission spectrometry at the same time, and calculating the effective aluminum content according to the contents of the distilled aluminum and the activated silicon based on a calculation formula: effective aluminum (%)=dissolved aluminum (%)- k*activated silicon (%), wherein the contents of the effective aluminum and the dissolved aluminum are based on Al2O3, the content of the activated silicon is based on SiO2, the value range of k is 0.90-1.10 and the optimal value is 1.006. The method provided by the invention is simple, fast and efficient, can be widely applied to exploration evaluation of the gibbsite bauxite, and is of guiding significance in adjustment of a production technology.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection, in particular to a method for measuring effective aluminum and active silicon in gibbsite-type bauxite. Background technique [0002] As domestic bauxite resources become more and more scarce, gibbsite-type bauxite has been paid more and more attention. In gibbsite-type bauxite, two important indicators to measure whether it has economic value are effective aluminum and active silicon. Effective aluminum refers to the net amount that can be extracted from the ore under the conditions of the Bayer process for alumina production. The content of alumina, active silicon refers to the content of silicon compounds that can chemically react with caustic alkali under the conditions of the Bayer process for producing alumina. [0003] The determination of available aluminum and active silicon in gibbsite-type bauxite usually adopts the method published by Austria Anton Paar Compan...

AI Technical Summary

Problems solved by technology

With this method, the determination of effective aluminum and active silicon cannot be carried out at the same time, and the advantages of inductively coupled plasma atomic emission s