Empirical analysis of limit of desulphurization of iron ore based on multi-factorial process variables

Abstract

Desulphurization of iron ore was carried out using an oxidant; powdered potassium chlorate (KClO3) of mass-input range (5-12g) and temperature range (500-800°C). The limit of desulphurization was evaluated considering the initial ore sulphur content and removed sulphur concentration. Investigation on the process analysis and mechanism of the desulphurization process revealed that oxygen gas from the decomposition of KClO3 interacted with sulphur through molecular combination within the Gas Evolution Temperature Range (GETR); 375-502°C. Sulphur transformation into vapour within this temperature range was observed to facilitate easy reaction with oxygen gas to form SO2, A limit of desulphurization; 92.22% was experimentally achieved following successful reduction of the initial ore sulphur content to 0.007 % using 12g of KClO3 at a treatment temperature of 800°C. A model was derived and used as a tool for empirical analysis of limit of desulphurization based on treatment temperature, mass-input of KClO3, sulphur loss-sulphur initial ratio. Deviational analysis indicates that the derived model gives best-fit process analysis with a deviation range of just 0.65–8.82%, from experimental results and invariably an operational confidence level range 91.18-99.35%. The deviation range corresponds to limit of desulphurization range: 31.4019-86.6128%, treatment temperature range: 600-800°C, KClO3 mass-input range: 7-12g and range of sulphur loss-sulphur initial ratio: 0.3444-0.5556. Hence, the derived model can exclusive, be significantly and viably operational within these process conditions.

Keywords

• Desulphurization, temperature, KClO3 mass-input, sulphur loss

References

1. Chapman WAP. Part 1, Workshop Technology, , 5th edition, Edward Arnold, London, 1973: 31 – 51.
2. Kosmider H and Danckert D. Methods for Desulphurizing Pig Iron. U. S. Patent 371520 Applications No. 05/115296, 1973.
3. Nwoye CI. C-NIKBRAN; Data Analytical Memory, 2008.
4. Nwoye CI. Process analysis and mechanism of desulphurization of agbaja iron oxide ore. Journal of Metallurgical and Materials Engineering, 2009; 8: 27 – 32. Nwoye CI, Ofoegbu S, Nwoye U, Inyama S, Eke H, and Nlebedim C. Model for predicting the concentration of sulphur removed during temperature enhanced oxidation of iron oxide ore. Journal of American Science, 2009; 5(4): 49 – 54.
5. Nwoye CI, Nwakwuo CC, Onugha E, Obiji S, Mbuka IE, and Obasi GC. Model for predicting the concentration of sulphur removed during gaseous state -35 -30 -25 -20 -15 -10 -5 C o rr e c tio n f a c to r (% ) M o D C o rr.f a c t o r