Application of Optimization Methods to Solid Phase Analysis of Combustion Gases Desulphurization Products
Abstract The variations in calcium and sulphur concentrations measured along cross-sections of limestone-lime sulphated particles in scanning electron microscope (EDS microanalysis) and the computation of the sum of oxides CaO+SO 3 , ( s ) and the molar ratio CaO/SO 3 , ( r ) are essential to identifying the compounds which could appear. A method of estimating the phase of sulphation limestone/lime products is presented in this paper. The aim of this method is to find such component proportions which minimize the differences between the measured and the calculated values of s and r . The method is developed using the software package CAMOS and enables one to calculate automatically the component proportions for the given system. In the paper the CaS–CaSO 4 –CaO–CaCO 3 and CaS–CaSO 4 –CaO–Ca(OH) 2 systems are considered. Some experimental examples are also shown.
The Use of Optimization Techniques in the Phase Identification of Sulphation Limestone Products
Abstract A new general method has been employed for the solid phase analysis of sulphation limestone products. The variations in calcium and sulphur concentrations measured along cross-sections of limestone sulphated particles in scanning electron microscope (EDS microanalysis) and the computation of sum of oxides CaO + SO3, (s) and the molar ratio CaO SO 3 , (r) are essential to identifying the compounds which could appear. The method of estimating the composition of the system uses an optimization technique, the aim of which is to find such component proportions which minimize the differences between the measured and the calculated values of s and r. The method is developed using a computer program which calculates automatically the component proportions for the given system. In the paper the CaSCaSO4CaOCaCO3 system is considered. Some experimental examples have also been shown.
Influence of foreign materials upon the thermal decomposition of dolomite, calcite and magnesite part I. Influence of sodium chloride
Abstract The influence of sodium chloride on the course of thermal decomposition of calcite, magnesite and dolomite was studied partly under dynamic, and partly under quasi-isothermal heating conditions. Four different types of sample holders were applied in the experiment, i.e., the partial pressure of carbon dioxide was also different in the four cases. It was found that the presence of sodium chloride reduced the decomposition temperature in every case. The extent of this reduction amounted to about 10°C in the case of calcite, 40–80°C in the case of magnesite, and 10–40°C and 10–20°C for the first and second decomposition stages, respectively, of dolomite.