ISSN:
1573-9139
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions The accuracy of the x-ray radiometric method of determining the mass fractions of Fe2O3 in refractory clays satisfies the technical requirements (the studies were carried out over the concentration range from 0.8 to 6%). The accuracy of the determination of the mass fraction of A12O3 according to the method given here is close to that of the chemical analysis. It can be improved by determining the concentration of A12O3 in the clays from a few (3–5) tablets made from the same sample followed by homogenization, or by using tablets of a more constant density, which necessitates using an increased pressure. The productivity of the modernized analyzer is 150–200 samples per shift when serviced by one or two operatives. The grinding of the sample to a grain size of ∼ 44μm remains the labor-intensive link in the processing chain. The accuracy and high speed of the x-ray radiometric method of analyzing refractory clays makes it possible to use this method for production monitoring and to introduce it in the future for the certification of refractory raw materials. Because a radioactive cadmium-109 isotope is used in the BRA-7M analyzer, the stability of the radiation source over the calculated period of the half-life of the isotope is improved, and this, of course, increases the accuracy of the determination of the mass fraction of the component in the raw material. The use of the isotope necessitates some safety measures and therefore it would only be reasonable to install the BRA-7M analyzer in enterprises where the annual volume of testing is 25,000 samples or more.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01398768
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