Study On Xrf Quantitative Analysis Method For Barite And Calcium Borate

In a nuclear power reactor, there are different forms of reaction products including ?-Ray, ?-Ray, ?-Ray, neutron and proton beam etc. In order to prevent such radiation from the operators and the environment, two types of radiation retarding concrete are normally formulated in nuclear buildings: one is aγ-ray proof high density concrete, mainly using barite as coarse aggregate; the other one is a neutron beam proof brown iron ore concrete, ingredient witgh calcium borate. Therefore, it is very important to strictly control the quantity and quality of the barite and calcium borate for such concrete . As for the barite, the specification requires that BaSO₄ at 90⁹6%, SiO₂ at 3⁵%, whilst for the calcium borate, boron must be higher than 12.6%, and the crystal water more than 17.6%.Currently, the inspection and analysis metheds for these material are titrimetry, colorimetry, gravimetric analysis etc, with long specimen preparation, lower operation efficiency, trivial operation procedures and larger diviation. therefore, a new quantitative detecting approach named WDXRF(Wavelength Dispersion X-Ray Fluorescence ) are drawing more attention in the inorganic analysis field with the advantages of rapid detecting process, wider detecting range, stable and reliable detecting results. In this work, WDXRF is adopted in the quantitative analysis of the primary and secondary components in the radiation retarding barite and calcium borate to replace the chemical analysis method as a preferred means in the quality control of radiation retardant such as barite and calcium borate. The analysis work are conducted as follows:1 Lacking any applicable national standard calibration samples, a semi-quantitative and qualitative analysis of the composition and material phase detection were conducted on the calcium borate mineral samples. According to the test results and composition specification requirement of the radiation retardants used calcium borate, 16 standard calibration specimens were proportionally formulated, with 14 national first grade standard substances namely chemical pure grade reagent lithium tetra borate, carbonate, soil, silicate and rock etc. within these formulated specimen, there were 12 categories of compounds including boron, calcium oxide, sodium oxide, magnesium oxide, iron sesquioxide, silicon oxide etc. As for the barite, 8 kinds of standard substance compoundings were composed gradiently with chemical reagent barium sulfate and standard soil, within which there were 8 categories of primary and secondary ingredients, namely BaO and SiO₂.2 XRF quantitative analysis approach on calcium borate meltdown sample was obtained with synthetic calcium borate standard samples. The accuracy and precision analysis results indicate that not only the content of the primary and secondary components may be precisely measured like the calcium oxide and magnesium oxide, but also the content of the borate is figured out with D-value calculation.3 XRF quantitative analysis approach on barite molten samples and pressed samples was established with synthetic barite standard samples. Through the precision and accuracy analysis, the differentiation of the two sample preparation methods was compared.The results indicated that with molten sample approach, the primary and secondary components can be more precisely detected for the barium sulfate and silicon oxide.