Solvent Extraction of Iron Ions From Hydrochloric Acid Solutions

Abstract

In this study Methyl Isobutyl Ketone (MIBK) and acetophenone (Methyl Phenyl Ketone) are presented as suitable agents for removal of Fe(III) from concentrated hydrochloric acid solutions. An extensive study applying 4 parameters was carried out: Time (5, 10,15,20,30 and 60 minutes), Stirring rate (200, 300, 400 and 500 r.p.m), Solvent to HCl Ratio (5%, 10%, 14% and 16%), and initial concentration of Fe ions in crude HCl (95.24, 126 ppm, 330 ppm and 1955 ppm).The best Condition was found to be 30 min-400 r.p.m-14 %. The distilled water was used to strip Fe ions out of MIBK; In order to get most of the MIBK dissolved in both the concentrated HCl and water. Diluents were used such as benzene, kerosene and xylene. Xylene gives better recovery of about 96%.

Best Conditions for Extraction and Stripping of Iron from Chloridic Aqueous Medium

“…The results are shown in Figure 4 explains the best value of extraction coefficient and percentage removed of Fe at agitation speed is 400 rpm. It is obvious that the extraction coefficient increases by increasing the speed of agitation reaching to certain value then decreases and this result is compatible with the result of Farouq [12]. This behavior of increasing of extract coefficient and then decreasing because at high speed the drops of the organic layer suffer from rapture forming small drops [16].…”

“…In some metal extraction processes, equilibrium time quit fast (30 min. ), and increasing in time lead to a slight increase in distribution coefficient [12,13]. For others, the equilibrium time is different based on metals, Cu, Zn and Cd take about 1hr.…”

“…The increasing of metal concentration in the feed solution guide to change properties of the continuous phase (aqueous) such as viscosity and density and these effect on dispersing of the organic layer into aqueous layer then control the transfer of metal from aqueous to organic phase [16]. There is another result, which is by increasing the initial concentration of metal, the removed percentage will be increased [12]. The difference of effect for initial metal concentration on percentage removed depends on the type of extractant, some extractants (with multi-function groups) have high capacity (amount of solute certain extract able to collect) however, increasing of metal concentration can be ingested by extractant.…”

Studying the Effect of Potassium Amyl Xanthate Surfactant on Fe, Cu and U Ions for the Pretreatment of Abu Zeneima Sulphate Leach Liquor

“…Several chemicals were used to decrease the iron content by precipitation, including NaOH and KOH, while sodium oxalate was found to be a poor precipitating agent [5]. Also, iron (Fe 3+ ) was eliminated from phosphoric acid solution by adsorption on charcoal [7] as well as it can be removed from the hydrochloric acid solution using methyl isobutyl ketone and acetophenone [8]. Furthermore, iron can be eliminated using poly (acrylamide-acrylic acid)titanium silicate (P (AMAA)-TS) composite adsorbent [9].…”