Abstract
The chemical compositions of minerals of industrial lime sinters were determined by X-ray microanalyzer and their etching behavior were observed.
Dicalcium silicate containing small amount of FeO and MgO was etched by water. Glassy silicate was dissolved by HC1 (1: 10), and the melilite and iron-gehlenite grains surrounded with the glassy silicate were observed to be brought into relief. The wustite grains containing CaO and MgO were not etched by the ordinary method, but unique etching pattern appeared when HC1 (1: 1) was used. Among the magnetite grains those which showed characteristic straight grooves after etched by HCl (1: 1) at 60°C were found to be the multicomponent system.
Calcium ferrite grains in the sinter were separated under an optical microscope and analyzed by X-ray diffraction method. All of the examined grains of the types of long columnar, crystallized and high aluminacontaining were identified as hemicalcium ferrite. The etching pattern varied with the existence of inclusion and precipitate, and alumina content in the grains.
