PERFORMANCE OF BLENDED AND UNBLENDED GREEN COKES DURING CALCINATION

摘要

As anode grade green cokes get scarcer in quantity and inferior in quality, calciners are finding it necessary to blend two or more cokes to obtain specifications desired by end-users, particularly aluminium smelters. Ideally green cokes should be calcined singly, as the operating parameters need to be changed in keeping with the characteristics of each quality of green coke, particularly volatile matter, density and granulometry. Pre-calcination blending is generally preferred to post calcination blending, supposedly for the homogeneity of the product. We decided to compare, ascertain and establish the performances of individual green cokes as against blends of the same cokes during calcination. GCL conducted trials for six cokes individually as well as with their blends under similar operating conditions. The properties of the calcined cokes resulting from using a blend were compared with those calcined individually.