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PROJECT TOPIC- ASSESSMENT EVALUATION OF REMOVED PHOSPHORUS CONCENTRATION BASED ON ITS AS-BENEFICIATED CONTENT AND TREATMENT TEMPERATURE

PROJECT TOPIC-   ASSESSMENT EVALUATION OF REMOVED PHOSPHORUS CONCENTRATION BASED ON ITS AS-BENEFICIATED CONTENT AND TREATMENT TEMPERATURE

ABSTRACT

An assessment evaluation of removed phosphorus concentration was carried out based on its as-beneficiated concentration and treatment temperature. Powdered potassium chlorate (KClO3) was mixed with iron ore concentrate and the mixture heated for 600 secs. in a laboratory furnace at within temperature range: 400-6000C. A model was derived from the generated experimental results, validated and used as a tool for the analysis. The validity of the two-factorial model expressed as; ζ = 0.0969 ln ϑ – 0.531 + 0.01ɤ was found to be rooted on the expression ζ – 0.01ɤ = 0.0969 ln ϑ – 0.531 where both sides of the expression are correspondingly approximately equal. Statistical analysis of the experimental and derived model-predicted removed phosphorus concentrations for each value of the treatment temperature considered shows standard errors of 0.0093 and 0.0011% respectively. Furthermore, removed phosphorus concentration per unit rise in the treatment temperature as obtained from experiment and derived model-predicted results were 2.31 x 10-4 and 2.05 x10-4 % / 0C respectively. Deviational analysis indicates that the derived model gives best-fit process analysis at deviations 4.63, 4.68 and 5.8% from experimental results and invariably, operational confidence level range: 94.2 – 95.37%. The deviations corresponded to treatment temperature range: 450-5500C.

INTRODUCTION

Entitlement resulting from presence of phosphorus in produced steel materials, above the admissible quantity has caused series of structural failures in the oil industry. This awakens the need for intensive researches geared towards reducing the phosphorus content of pig iron below the admissible level.
Some researches [1-5] have evaluated ways of achieving successful dephosphorization of iron oxide ore and also predicting removed phosphorus concentrations using empirical models. A model was derived for predictive analysis of the concentration of phosphorus removed during leaching of iron oxide ore in sulphuric acid solution [6]. The work indicated that phosphorus removal from the iron oxide ore as obtained from experiment and derived model is dependent on the initial and final pH of the leaching solution. This is because the final pH of the leaching solution is greatly determined by the initial pH which is function of hydrogen ion concentration.
A similar work [7] shows that phosphorus removal is dependent on leaching temperature. The model derived using experimental results indicated that at a leaching temperature range 45-700C, the maximum deviation of the model-predicted removed phosphorus concentration (from the corresponding experimental values) was less than 29%.

PROJECT TOPIC-   ASSESSMENT EVALUATION OF REMOVED PHOSPHORUS CONCENTRATION BASED ON ITS AS-BENEFICIATED CONTENT AND TREATMENT TEMPERATURE

Empirical analysis of phosphorus removal was carried out [8] based on its as-beneficiated concentration and mass-input of KClO3. A model was derived and used as a tool for the analysis. The model is expressed as: PR = – 0.0005 α2 + 0.01α + 0.0024 γ2 + 0.0181 (1)
The validity of the two-factorial model was found to be rooted on the expression 100 PR + 1.81 = – 0.05 α2 + α + 0.24 γ2 where both sides of the expression are correspondingly approximately equal. Statistical analysis of the derived model-predicted, regression model-predicted and experimental removed phosphorus concentrations for each value of the mass-inputs of KClO3 considered shows standard errors of 0.0015, 3.45 x 10-5 and 0.0025% respectively.

Furthermore, removed phosphorus concentration per unit mass-input of KClO3 as obtained from derived model-predicted, regression model-predicted and experimental results were 3.0 x 10-3, 2.975 x 10-3 and 2.475 x 10-3 % g-1 respectively. Deviational analysis indicates that the derived model gives best-fit process analysis with a deviation range of just 1.35 – 12.29%, from experimental results and invariably an operational confidence level range 87.71-98.65%. The deviation range corresponded to the removed phosphorus concentration range: 0.0213-0.0333 % and KClO3 mass-input range: 11-15g. This implies that the derived model can exclusively be significantly useful and viably operational within these process conditions.
The aim of this work is to assess the removed phosphorus concentration based on its as-beneficiated concentration and treatment temperature. The essence of this work is to ascertain the level of dephosphorization achievable at different treatment temperatures where all other input process parameters are kept constant. 

MATERIALS AND METHODS

Agbaja (Nigeria) iron ore concentrate used for this work was obtained from Nigeria Metallurgical Development Centre (NMDC) Jos. This concentrate was dried in air (under atmospheric condition) and used in the as-received condition with particle size; 150μm. Weighed quantities of the dried iron ore concentrate and powdered KClO3 (obtained from Fisher Scientific Company Fair Lawn, New Jerry, USA) were mixed on five different iron crucibles.

The mixtures were poured into the crucibles and then heated to a temperature of 4000C in a Gallenkamp Hot pot electric furnace at NMDC Laboratory for 600 secs. and thereafter were emptied on white steel pans for observation. The experiment was repeated using varied treatment temperatures i.e 450, 500, 550, 6000C and constant mass-inputs of iron ore and KClO3. Weighed quantities of the sample mixtures for each experiment set were taken (after heating) for chemical analysis (to determine percentage phosphorus removal) using wet analysis method. The average of the removed phosphorus concentration determined in each experiment set was taken as the precise result.

 

PROJECT TOPIC-   ASSESSMENT EVALUATION OF REMOVED PHOSPHORUS CONCENTRATION BASED ON ITS AS-BENEFICIATED CONTENT AND TREATMENT TEMPERATURE

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