Abstract: A process for calcining a sulfate-containing denitrating catalyst to reduce the sulfate content therein is provided. A plurality of catalyst units are arranged on a reticulating belt in a calcining furnace. The reticulate belt is continuously moving within the furnace. Fresh hot air is passed through the denitrating catalyst units in a first direction and then in a second direction. By controlling the rate of hot air flow, the content of sulfate group in the denitrating catalyst is reduced to about 4-7% by weight.

Abstract: There is proposed a process of continuously producing a catalyst plate, wherein a thin metal plate is formed by use of a blade with slits in the widthwise directions thereof, expanded in the longitudinal direction thereof into an expanded metal plate having formed therein meshes, the expanded metal plate thus formed is corrected in shape, degreased, thereafter, molten metal such as molen aluminum is sprayed onto the expanded metal plate to form roughened surfaces on the opposite sides of the expanded metal plate, further, a catalytic substance is deposited onto the roughened surfaces, thereafter, formed into a predetermined form, and shorn into pieces. There is proposed a pinch roll system having a tension roll, in which end portions in the widthwise direction are vertically movable so as to be used as a corrector for the expanded metal plate, and a stepping press system to be used as a former for the expanded metal plate.