Figure 4.
The image is a stacked bar chart representing energy consumption measured in megajoules per kilogram for different types of clay, specifically labelled B 1, B 2, C 1, C 2, C 3, C 4, and D 1. The y axis indicates the energy consumption ranging from 0 up to 2 point 5 megajoules per kilogram, while the x axis lists the types of clay. Each bar is divided into two segments, the lower segment represents net energy depicted in blue, and the upper segment represents recovery depicted in green. The bars vary in height, illustrating the differences in energy consumption among the clay types, with the total height of each bar showing the combined values of net energy and recovery. The chart effectively allows for a visual comparison of the energy consumption and recovery across the different clay types.Net energy demand of calcined clays used in the present study