An Applicationresearch Of Flotation Separation Methods For Continuous Analysis Of Impurity Elements From Barium Titanate

Barium titanate is one of the most widely used electronic ceramic materials. The content of the impurity in barium titanate are determined by inductively coupled plasma atomic emission spectrometry and visible spectrophotometer in industry standard of electronic industry. Although inductively coupled plasma atomic emission spectrometry can analyze multiple elements simultaneously with comparable high sensitivity, the standard addition method is still used to eliminate matrix interference at the expense of sensitivity, and the equipment is relatively expensive and has lower penetration rate. This thesis used the floating technology for the separation and enrichment of the impurity elements in barium titanate. It had achieved the separation between the measured component and the interference component by way of selecting and controlling flotation conditions and the elements were determined by atomic absorption spectrophotometer and spectrophotometer which were of simple device and higher penetration rate. It had solved the problem about the lower sensitivity of determining the strontium and calcium and the impact of the matrix effect on the determination as well as the lower sensitivity and poor selectivity of aluminum, silicon. It had achieved the selectivity and continuous analysis of the multi-component.In this thesis, the flotation system was HTTA-MIBK for the elements iron, strontium and calcium. The two elements had been effectively enriched in the organic phase after the best separation conditions for flotation were established by orthogonal test and the optimization of the atomic absorption instrument conditions. It had improved the selectivity and sensitivity by the atomic absorption spectrometry. In the continuous determination of aluminum and silicon in the aqueous phase, the element of aluminum was determined by the quaternary color system of Al-CAS-CPC-OP, and its complex was flotation separated by MIBK. The absorbance was get by the organic phase. The element of silicon was determined by silicon-molybdenum blue color method, and its complex was flotation separated by isoamyl alcohol. It achieved the selective analysis of aluminum and silicon.This paper studied the interference and suppression of matrix titanium and barium in the determination of barium titanate. The matrix titanium was masked by adding mandelic acid and the matrix barium was removed in the form of barium chromate precipitation. It had achieved the determination of strontium, iron and calcium in the organic phase and the continuous analysis of aluminum and silicon in the water phase after coloration and flotation. The potassium, sodium, magnesium that had higher sensitivity in the aqueous phase were determined by standard addition method after flotation. The method of continuous analysis of impurity elements from electronic-grade barium titanate is established, the process is simple and the method is easy to grasp.