Study on a new technology of flue gas desulfurization in sintering process

In this paper, a new technology of sintering flue gas desulfurization is proposed. The principle is that some kind of additives is introduced into feed mix, the additives decompose into NH3 in sintering process during heating, the NH3 reacts with SO2 gas to form ammonium sulphate solid particles, the particles are captured as dust by ESP, so the removal of SO2 in sintering flue gas is achieved. The study results show that the concentration of SO2 in sintering flue gas decreases gradually with the increase of additive amount, when the specific quantity of additive is 3.02kg per ton mix, the decreasing rate of SO2 is up to 81.33%(mass). Since sintering dust must be recycled as raw materials, in order to solve the problem of flue gas SO2 concentration is gradually increasing, the approach of increasing the amount of additive can be taken, or the dust is separately treated for sulfur removal before being used as raw sintering material. The hew approach of reducing SO2 emission in sintering flue gas has advantages of low investment, small occupation area and low operation cost. Moreover, the additive is inexpensive and readily available, so sintering cost is not increased obviously.