Electrical low pressure impactor (ELPI) was used to analyze the particulate matters size, mass concentration distribution and ions from two sintering processes after dust removal and desulfurization. Results showed that the grain number concentration of the particulate matters from the sintering process after dust removal and desulfurization was in the range of 10⁵~10⁷cm^-3, and 67%~77% particulate matters' particle sizes were mainly below 0.1μm. The mass concentration distribution showed double peaks. Two peaks respectively existed at 0.61μm and 1.62μm of particle size in No.1sintering process, while two peaks respectively existed at 0.37μm and 1.62μm of particle size in No.2 sintering process. Chemical composition analysis indicated that the highest content of water-soluble ions in PM₁ from No.1 sintering process were NH₄⁺ and Ca²⁺, which was 15.26% and 14.84%, respectively. The highest content of water-soluble ion in PM_>1 from No.1 sintering process was SO₄^2-, which was 33.52%. The highest content of water-soluble ions in PM₁ and PM_>1 from No.2 sintering process were Cl^- and SO₄^2-, which was 28.12% and 29.21%, respectively. 60% of SO₄^2- concentrated in the particulate matters of 6.89~10.23μm particle size in No.1sintering process, and 81% of SO₄^2- concentrated in the particulate matters with the particle size below 2.5μm in No.2 sintering process. The content of Cl^- in the particulate matters of different particle sizes distributes uniformly in No.1sintering process, and 45% of Cl^- concentrated in the particulate matters of 0.13~0.24μm particle size for a peak in No.2 sintering process.