Quantitative Analysis of Non-Crystalline and Crystalline Solids in Blast Furnace Slag

Abstract

The granulation of blast furnace slag (BFS) with water quenching treatment has some disadvantages, such as high water consumption and difficulty for recovery heat. So developing a new dry granulation technique to treat BFS is very important. The applicability of BFS directly depends on the content of non-crystalline solids in the slag after treatment. So it is of theoretical and practical significance to analyze the content of non-crystalline solids in the slag quantitatively and simply. Metallographical test is mainly adopted to quantify the non-crystalline in BFS so far with the shortages such as complex sample, difficult determination, ect. The diffraction intensity of non-crystalline is proportionate to the content of non-crystalline in BFS, X-ray diffraction method was adopted to quantify the noncrystalline and the crystalline solids in BFS. The quantitative coefficient between the crystalline and the non-crystalline solids of BFS is 0.70 of BFS whose main composition (mass percent, %) is: CaO 38. 2, SiO₂ 35. 7, Al₂O₃ 16. 3, and MgO 8. 3. The relative error of X-ray diffractometer for quantitatively analyzing non-crystalline content of BFS is less than 1%.