Chemical Studies on the Removal of Iron from Crude Phosphoric Acid Using an Organosilicon Compound

M H Soliman,M N Kouraim,H S Gado

doi:10.1155/2009/251790

M H Soliman, M N Kouraim + Show 1 more

Open Access

https://doi.org/10.1155/2009/251790

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Abstract

A new adsorbent has been developed to reduce the concentration of iron in crude Egyptian phosphoric acid. This adsorbent has been formed by the treatment of silicate compound derived from clay mineral with π organic acceptor ligand to carry out the exchange of ions as well as complexation with iron. Several parameters (shaking time, temperature, sorbent mass, and batch factor) have been studied. The adsorption of iron from crude phosphoric acid was investigated. The various methods to characterize the adsorption of iron on organosilicon compound (OSC) were collectively evaluated in this study. According to the Langmiur model, the maximum monomolecular capacity (Qº) is 122 mg/g and 122 mg/g with Freundlich model for an initial iron concentration of 2.37% contained in crude phosphoric acid. Characterization studies such as x-ray diffraction, infrared spectroscopy and electron scanning microscope were investigated to substantiate the nature of iron-OSC complexes.

Highlights

The wet-process involves reaction of phosphate rock with an acid to produce crude phosphoric acid which contains a variety of impurities, that vary according to the original of minerals
The uptake percent of iron on the organosilicon compound (OSC) plotted against the respective OSC dose in Figure 1 shows that the adsorption increases by increasing OSC dose till 12 g/L become a constant bec4a0use of the saturation of the active sits
Iron could be removed efficiently from phosphoric acid produced at Abu-Zaabal Company, Egypt, using organosilicon compound

Summary

Introduction

The wet-process involves reaction of phosphate rock with an acid (mainly sulfuric acid) to produce crude phosphoric acid which contains a variety of impurities, that vary according to the original of minerals. Many of these impurities the solid ores are removed from the acid by techniques such as clarification. The presence of these impurities affects the quantity and the quality of the product For this reason, about 95% of the acid produced by the wet-process is directly used as fertilizers and excluded from the use in non-fertilizer applications[1].

F MgO CaO SO4 FeO Total Fe as Fe2O3 Organic matter

Results and Discussion

Conclusions