The iron ore sintering process is the main source of SO_2 emissions in the iron and steel industry. In our previous research, we proposed a novel technology for reducing SO_2 emissions in the flue gas in the iron ore sintering process by adding urea at a given distance from the sintering grate bar. In this paper, a pilot-scale experiment was carried out in a commercial sintering plant. The results showed that, compared to the SO_2 concentration in flue gas without urea addition, the SO_2 concentration decreased substantially from 694.2 to 108.0 mg/m~3 when 0.10wt% urea was added. NH_3 decomposed by urea reacted with SO_2 to produce(NH_4)_2SO_4, decreasing the SO_2 concentration in the flue gas. The iron ore sintering process is the main source of SO_2 emissions in the iron and steel industry. In our previous research, we proposed a novel technology for reducing SO_2 emissions in the flue gas in the iron ore sintering process by adding urea at a given distance from the sintering grate bar. In this paper, a pilot-scale experiment was carried out in a commercial sintering plant. mg / m ~ 3 when 0.10 wt% urea was added. NH_3 decomposed by urea reacted with SO_2 to produce (NH_4) _2SO_4, decreasing the SO_2 concentration in the flue gas.