Multi-Factorial Analysis of Particulate Iron Ore Desulphurization during Beneficiation with Powdered Potassium Chlorate

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Iron Ore, Gas Evolution Temperature Range GETR, Powdered Potassium Chlorate, Sulphur
C. I. Nwoye; C. E. Njoku; C. C. Nwogbu; G. Onyedika; E. M. Ameh
Particulate iron ore desulphurization was carried out using powdered potassium chlorate which acted as an oxidant on the sulphur present in the ore. The process analysis and mechanism of the desulphurization process involving oxygen gas interaction with sulphur through molecular combination within the Gas Evolution Temperature Range (GETR); 375-502oC as observed in previous works were confirmed. It was observed that sulphur transformed into vapour within this temperature range facilitated easy reaction with oxygen gas produced from the decomposition of KClO3. Sulphur present in the iron ore was successfully reduced to 0.007 % using 12g of KClO3 at a treatment temperature of 8000C. A model was derived and used as a tool for quantitative evaluation of removed sulphur concentration based on initial sulphur content, treatment temperature and mass-input of KClO3. The derived model is expressed as; SR = 3 x 10-4 α3 – 7.45 x 10-3 α2 + 0.0613 α + 0.0001 γ + β2 – 0.1987 The validity of the three-factorial model was found to be rooted on the expression 5.0327SR + 1= 1.5098 x 10-3 α3 – 37.4937 x 10-3 α2 + 0.3085 α + 5.0327 x 10-4 γ + 5.0327 β2 where both sides of the expression are correspondingly approximately equal. Statistical analysis of the derived model-predicted, regression model-predicted and experimental sulphur removed concentrations for each value of treatment temperature and mass-inputs of KClO3 considered shows a standard errors of 0.0025, 3.01 x 10-5 & 0.0057% and 0.0082, 0.0108 & 0.0105% respectively. Furthermore, removed sulphur concentration per unit treatment temperature as obtained from derived model-predicted, regression model-predicted and experimental results are 1.51 x10-4, 1.965 x 10-4 and 1.55 x 10-4 %/0C respectively. Similarly, removed sulphur concentration per unit mass-input of KClO3 as obtained from derived model-predicted, regression model-predicted and experimental results are 7.55 x10-3, 9.825 x10-3 and 7.75 x10-3 %/g. Deviational analysis indicates that the maximum deviation of the model-predicted removed sulphur concentration from the corresponding experimental results is less than 19.6%.

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