Sulfide ore acid production plant: roasting, conversion, boiler, commissioning – kiln design plan

Generally, the drying of the boiling furnace is carried out simultaneously with the boiler, but it hardly ever happens in sync with the conversion process; the only time it is done in sync with conversion is during the temperature increase prior to commissioning, and that is a different matter. The drying of the fluidized bed furnace is carried out simultaneously with that of the boiler, but with emphasis on the fluidized bed furnace. The temperature rise during the drying process of the boiling furnace occurs at a rate of 10 degrees per hour; once it reaches around 150 degrees, the temperature is maintained for 24 hours, with the aim of evaporating the free water inside the furnace. Then, the temperature rises again at 10 degrees per hour, and when it reaches 350 degrees, the temperature is held constant for 36 hours, in order to evaporate the crystalline water present in the furnace. After that, the temperature continues to rise at 10 degrees per hour, until it reaches 650 degrees, at which point the temperature is maintained for 48 hours, with the goal of evaporating any remaining bound water. Once this stabilization is achieved, the drying process is considered complete. At this stage, the temperature may drop naturally, or it may be reduced to ambient temperature at a rate of 20 degrees per hour, depending on the local climate conditions. During the heating up of the boiling furnace, the boiler is also being used simultaneously. Before increasing the temperature, water should be added; the water level should not be too high – generally, it’s sufficient to reach the lowest water level line. After that, chemicals for furnace treatment are added depending on the temperature increase, and thereafter, the boiling furnace is primarily used for further operations.