Effect of lime on sintering

Investigation of the influence of lime content in the charge and its quality on the sintering process of iron ore raw materials

“…Comparison of the obtained results with the literature data about the impact of lime content in the sinter charge with a constant burning degree on the sintering process [6,7] indicates a similar nature of changes occurring in these cases, that is, when the content of active CaO in the charge is changes.…”

“…The laboratory sinter burnings in Raw Materials Research Center OJSC "Severstal" with the use of lime showed [7] that the dependence of charge pelletization degree on the content of lime in it is extreme. The dependence of the charge sintering rate on the lime content in it also has an extreme nature.…”

Reducing emissions of PCDD/F in sintering plant: numerical and experimental analysis

“…(i) number of the windbox: progressive value that indicates in which windbox there was a known level of emissions (ii) gas temperatures in the windbox and windleg (iii) percentage of O 2 , CO 2 , CO and Moi inside the windbox that affects the development of PCDD/F 22 (iv) exit gas rate (in m s 21 ): it appears to be an important parameter because it defines how long the gas remains within the windbox 23 (v) Cl and Cu: both elements improve the production of PCDD/F, although in different ways; chlorine is a key component of the structure of PCDD/F, and depending on the number of atoms on the rings, it defines the hazards and toxicity; copper is a strong catalyst and thus fosters a series of chemical reactions, leading to the development of PCDD/F 19,20 (vi) addition of S, according to the following three ways: through gas SO 2 added to the combustion gases, by the addition of coal containing sulphur with more impact than the previous case of pollutants SO 2 , in the form of sulphur based reagents added to crude oil 24 (vii) addition of urea, which has a dual effect of inhibition: it can act on the urea functional groups by blocking some surface complexes and thereby reducing the availability of catalytic metal sites and can coat the surface of the particulates and prevent chemical reactions [25][26][27][28] (viii) addition of hydrated lime: capable of increasing the economic productivity of sintering; it is demonstrated to be a good suppressor of PCDD/F; [29][30][31] normally, HCl reacts with oxygen to form water and Cl 2 ; the lime reduces the atmosphere of chlorination by setting HCl in CaCl 2 , which has the lowest vapour pressure between the various metal chlorides. 32 The analysis of the sintering process was performed on a sintering plant (Dwight-Lloyd) belonging to an Italian steel company The emissions levels in the past years before the study are shown in Fig.…”

Solutions for containing dioxin emissions from iron ore sintering at Italian plant

“…Similar results, related to the addition of lime to the raw sinter mix, were recently reported by other authors. 9 The average plant productivity during R3 increased by a 12% with respect to the average productivity during R1 (30 t m 22 h 21 ) and by a 5% with respect to the average productivity during R2.…”