Chemical corrosion of basic refractories by cement kiln materials

The study of basic refractories corrosion by cement kiln materials was carried out with powder tests and coating tests at the typical temperature range of the sintered material in the transition zone and the sintering zone (1200-1450 degrees C). The tested basic refractories were magnesia-spinel (MSp) and magnesia zirconia (MZ) refractory bricks. The industry cement kiln materials were rich of sulphur and chlorine. The microstructures of the as-delivered and tested samples were researched by XRD and SEM-EDS techniques. The new phases detected in the samples with MSp (with and without ZrO(2)) bricks after tests at the temperature of 1200 degrees C were binary (C(12)A(7) t(mp) - 1392 degrees C, CaZrO(3): tmp 2345 degrees C)(1): and ternary (C(2)AS: t(mp) - 1593 degrees C or C(3)MS(2): t(dp) - 1573 degrees C) phases. After tests at the temperature of 1300 degrees C and higher, ternary phases of C(7)A(3)Z (t(mp) - 1550 degrees C) and CaZrO(3) and quaternary phases Q-C(20)A(13)M(3)S(3) or C(6)A(4)(M,f)S (t(dp) - 1380 degrees C) were detected. The C(3)A(3)center dot CaSO(4) phase was formed in the samples after the corrosion tests performed up to the temperature of 1300 degrees C. The new phases formed in the sample with the MZ bricks were clinker phases (beta-C(2)S, C(3)A and C(2)(A,F)/C(4)AF) and the C(7)A(3)Z phase. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.