火焰原子吸收法测定霞石中的氧化钾和氧化钠

本方法用于测定霞石中的钾、钠，主要通过在溶样时加入氢氟酸除去二氧化硅，调整溶液中钾、钠的含量，消除互相之间的干扰，加入氯化铯消除电离因素的干扰，提高了分析结果的准确性和重现性，使测定结果更接近化学分析值。回收率为99．2％-101．6％。     

Development of hexa- and mono-celsian in the crystallization of banalsite BaNa2Al4Si4O16 (LiF-CaF2-B2O3) glasses

On the basis of the mineral banalsit (BaNa₂Al₄Si₄O₁₆) and the addition of small B₂O₃ concentrations, transparent glasses were prepared. Furthermore, in order to achieve nucleation, LiF and CaF₂ were added. Hexacelsian was formed in bulk crystallized glass samples whereas, monocelsian, as well as small quantities of nepheline and banalsite were crystallized from sintered glass powder. The scanning electron micrographs of the sintered samples show high crystallinity and crystals with sizes from nano to micrometers. The SEM micrographs and the EDX microanalyses show that nano size rods of monocelsian surrounded by micrometer-sized hexagonal nepheline, banalsite or residual glassy phase occur. The coefficient of thermal expansion of the samples sintered at 1000 °C was higher (12.93–9.52 × 10⁻⁶ K⁻¹) in hexacelsian containing samples than in monocelsian (2.24–7.35 × 10⁻⁶ K⁻¹) containing ones. The samples also showed notably different densities of 2.6424 and 2.4718 g/cm³, respectively.     

火焰原子吸收法测定霞石中的氧化钾和氧化钠

本方法用于测定霞石中的钾、钠，主要通过在溶样时加入氢氟酸除去二氧化硅，调整溶液中钾、钠的含量，消除互相之间的干扰，加入氯化铯消除电离因素的干扰，提高了分析结果的准确性和重现性，使测定结果更接近化学分析值。回收率为99．2％-101．6％，总体标准偏差为0．04％。     

An application of infrared analysis to determine the mineralogical phases formation in fluxes for thin slab casting of steel

The Fourier Transformed Infrared (FTIR) spectra analysis of two fluxes used in the thin slab casting process of steel were carried out in order to identify the mineralogical species present in fluxes as received and after a heat treatment to 1573 K and further solidification at two different cooling velocities. Fluxes as received show the presence of wollastonite (CaO·SiO₂) and a sodium carbonate (Na₂CO₃) as the main components; after the heat treatment, there was almost a whole transformation from the original compounds to cuspidine (3CaO·2SiO₂·CaF₂) and nepheline (Na₂O·Al₂O₃·2SiO₂) phases. These results were confirmed by X-ray powder diffraction (XRD) to the slowly cooling velocity. The FTIR technique is proposed as a useful and complementary technique to X-ray diffraction to study the structure of commercial fluxes for thin slab casting.