History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t5.7

v1.c13.s2.t5.7

At the same time Borax and salt added to the mixtures must have helped in low temperature sintering of the charge as well as slag formation. The studies carried out by Gangopadhyaya et al. (1984) on the retorts and debris of the Zawar area have shown that the material remaining after the distillation was both as fused slag as well as sintered mass and their analysis was as given in Table 11 with respect to Zn, Pb, Fe and S. This table also gives the metallic content of the retort wall, and from the study of this table it is very obvious that major part of the Zn was extracted leaving only 3% Zn in the residue, and the density of the retort wall was good Table 10 — Mineralogical Analysis of the Ceramic Material of the Zinc Retort Wall.