Quantitative Leaching of a Nigerian IronOre in Hydrochloric Acid

A study on the quantitative leaching of iron ore in hydrochloric acid solution has been undertaken. The elemental composition of the iron ore was also carried out using ICP-MS technique. The major elements in the iron ore include: Fe(66.7%); Al (0.2%); Si (5.2%); Ti (0.02%) and O (28.0%). Some traces of V, Ni, Zn, Ce, Cr, La, Y and Zr were also found. The effects of contact time, acid concentration, temperature, particle size and, the stirring speed on the dissolution of the iron ore have been investigated. The dissolution rate depends on the hydrogen ion concentration and temperature of the reaction system. The mechanism of dissolution appears to follow an exothermic pathway. The activation energy for the dissolution reaction was 13.63 kJmol-1. About 92% of the total iron in the ore was dissolved within 120 min. by 12M HCl solution and 80\ub0C using 0.1mm particle size. The optimum stirring speed was 300rpm. @JASE

Investigation of Chemical and Microbial Leaching of Iron ore in Sulphuric acid

Investigations on the chemical and microbial leaching of a Nigerian Iron-ore in sulphuric acid have been carried out. The influence of physico-chemical parameters such as acid concentration, temperature, particle size and stirring speed on the chemical dissolution of the ore was investigated. The dissolution rates are significantly influenced by the temperature and acid concentration while the increase of percentage dissolved with stirring speed and particle size was very moderate. The rate of the reaction based on reaction-controlled process was found to conform with the shrinking core model: 1-(1-\u3b1)1/3sup> = kt. With 12M H2sub>SO4sub> and at a temperature of 800C with a stirring speed of 360rpm and particle size 0.04-0.05mm, about 76.80% of iron-ore was dissolved within 120min. The activation energy of 38.29kJ/mole was calculated for the process. The reaction is first order with respect to H+ ion concentration. An attempt to dissolve the ore via microbial action of thiobacillus ferroxidans was not successful. This has been attributed probably to very low sulphur content of the mineral

Upgrading of a Nigerian Ixiolite ore to Columbite by Sulphuric acid treatment

A quantitative leaching of a Nigerian Ixiolite ore in sulphuric acid medium was carried out and the effect of some parameters such as acid concentration, temperature and particle size was evaluated as a function of time. The experimental results obtained showed that the Ixiolite dissolution increases with increasing acid concentration, temperature, leaching time and, decreases with particle size. With 3 mol/L H2SO4 solution, 71.14% of the ore reacted within 120 minutes at 80 °C.The kinetics of dissolution of the mineral was also examined and the observed effects of the operating variables on the leaching rate were consistent with the diffusion controlled kinetic model. The calculated activation energy for the leaching process was 24.40 kJ/mol with the reaction order of 0.5, supported the proposed model. Detailed characterization of the ore before and after leaching were carried out. At optimal leaching conditions, thermodynamic feasibility of the conversion of raw Ixiolite to Columbite of industrial value, as confirmed by X-ray diffraction (XRD) technique is possible

Quantitative Leaching of a Spent Cell Phone Printed Circuit Board by Hydrochloric acid

This paper presents a kinetic data on the hydrometallurgical recovery of some metal ions from a printed circuit board (PCB) of a spent cell phone by hydrochloric acid leaching. The effects of acid concentration, temperature and particle diameter on the dissolution efficiency at various leaching time intervals were examined. The results of the leaching investigations showed that the powdered cell phone dissolution increases with increasing acid concentration, system temperature with decreasing particle diameter at 360 rpm. With 2M HCl solution, about 88.49% of the sample was dissolved within 120 minutes using 0.075-0.112 mm particle diameter at 800 C. The results of the study indicated that the dissolution reaction could be represented by a shrinking core model with surface chemical reaction. A value of 0.61, 60.67 kJ/mol and 12.9s-1 were calculated as reaction order, activation energy and frequency factor, respectively for the dissolution process.http://dx.doi.org/10.5937/metmateng1402119

Upgrading of a Nigerian Ixiolite ore to Columbite by Sulphuric acid treatment

A quantitative leaching of a Nigerian Ixiolite ore in sulphuric acid medium was carried out and the effect of some parameters such as acid concentration, temperature and particle size was evaluated as a function of time. The experimental results obtained showed that the Ixiolite dissolution increases with increasing acid concentration, temperature, leaching time and, decreases with particle size. With 3 mol/L H2SO4 solution, 71.14% of the ore reacted within 120 minutes at 80 °C.The kinetics of dissolution of the mineral was also examined and the observed effects of the operating variables on the leaching rate were consistent with the diffusion controlled kinetic model. The calculated activation energy for the leaching process was 24.40 kJ/mol with the reaction order of 0.5, supported the proposed model. Detailed characterization of the ore before and after leaching were carried out. At optimal leaching conditions, thermodynamic feasibility of the conversion of raw Ixiolite to Columbite of industrial value, as confirmed by X-ray diffraction (XRD) technique is possible

Assessment of a Nigerian chalcopyrite ore dissolution in sulfuric acid medium

ABSTRACT. This paper presents a study of dissolution kinetics of a Nigerian chalcopyrite ore in sulfuric acid lixiviant. The effects of acid concentration, temperature and particle diameter on the dissolution rates of chalcopyrite ore have been examined. The dissolution rates are significantly influenced by increase in temperature, hydrogen ion concentration [H+], and decrease in particle diameter. The experimental data for the dissolution rate have been analyzed with the shrinking core model which shows the rate controlling step for the dissolution of chalcopyrite ore occurs via surface chemical solution. With 4 M H2SO4 solution, about 91.6% of 10 g/L chalcopyrite ore at 80 oC was dissolved within 120 min using -90+75 µm particle diameter. The reaction order with respect to hydrogen ion concentration was found to be 0.57 with correlation coefficient 0.968. The calculated activation energy, (Ea) value of 44.9 kJ/mol for the dissolution process was established. However, the SEM morphology of the residues from leaching process showed that about 8.4% of the initial solid material contained admixtures of Fukuchilite (Cu0.42Fe0.58S2), and elemental sulphur (So) and are formed around the shrinking core of the unreacted material.                KEY WORDS: Chalcopyrite, Sulfuric acid, Dissolution kinetics   Bull. Chem. Soc. Ethiop. 2022, 36(1), 187-196.                                                             DOI: https://dx.doi.org/10.4314/bcse.v36i1.15                                                     &nbsp

Quantitative Leaching of a Spent Cell Phone Printed Circuit Board by Hydrochloric acid

This paper presents a kinetic data on the hydrometallurgical recovery of some metal ions from a printed circuit board (PCB) of a spent cell phone by hydrochloric acid leaching. The effects of acid concentration, temperature and particle diameter on the dissolution efficiency at various leaching time intervals were examined. The results of the leaching investigations showed that the powdered cell phone dissolution increases with increasing acid concentration, system temperature with decreasing particle diameter at 360 rpm. With 2M HCl solution, about 88.49% of the sample was dissolved within 120 minutes using 0.075-0.112 mm particle diameter at 800 C. The results of the study indicated that the dissolution reaction could be represented by a shrinking core model with surface chemical reaction. A value of 0.61, 60.67 kJ/mol and 12.9s-1 were calculated as reaction order, activation energy and frequency factor, respectively for the dissolution process.http://dx.doi.org/10.5937/metmateng1402119

Quantitative leaching of a Nigerian iron ore in hydrochloric acid

A study on the quantitative leaching of iron ore in hydrochloric acid solution has been undertaken. The elemental composition of the iron ore was also carried out using ICP-MS technique. The major elements in the iron ore include: Fe(66.7%); Al (0.2%); Si (5.2%); Ti (0.02%) and O (28.0%). Some traces of V, Ni, Zn, Ce, Cr, La, Y and Zr were also found. The effects of contact time, acid concentration, temperature, particle size and, the stirring speed on the dissolution of the iron ore have been investigated. The dissolution rate depends on the hydrogen ion concentration and temperature of the reaction system. The mechanism of dissolution appears to follow an exothermic pathway. The activation energy for the dissolution reaction was 13.63 kJmol-1. About 92% of the total iron in the ore was dissolved within 120 min. by 12M HCl solution and 800C using 0.1mm particle size. The optimum stirring speed was 300rpm. Journal of Applied Sciences and Environmental Management Vol. 9(3) 2005: 15-2

Investigation of Chemical and Microbial Leaching of Iron ore in Sulphuric acid

Investigations on the chemical and microbial leaching of a Nigerian Iron-ore in sulphuric acid have been carried out. The influence of physico-chemical parameters such as acid concentration, temperature, particle size and stirring speed on the chemical dissolution of the ore was investigated. The dissolution rates are significantly influenced by the temperature and acid concentration while the increase of percentage dissolved with stirring speed and particle size was very moderate. The rate of the reaction based on reaction-controlled process was found to conform with the shrinking core model: 1-(1-α)1/3sup> = kt. With 12M H2sub>SO4sub> and at a temperature of 800C with a stirring speed of 360rpm and particle size 0.04-0.05mm, about 76.80% of iron-ore was dissolved within 120min. The activation energy of 38.29kJ/mole was calculated for the process. The reaction is first order with respect to H+ ion concentration. An attempt to dissolve the ore via microbial action of thiobacillus ferroxidans was not successful. This has been attributed probably to very low sulphur content of the mineral

Quantitative Leaching of a Nigerian Iron Ore in Hydrochloric Acid

A study on the quantitative leaching of iron ore in hydrochloric acid solution has been undertaken. The elemental composition of the iron ore was also carried out using ICP-MS technique. The major elements in the iron ore include: Fe(66.7%); Al (0.2%); Si (5.2%); Ti (0.02%) and O (28.0%). Some traces of V, Ni, Zn, Ce, Cr, La, Y and Zr were also found. The effects of contact time, acid concentration, temperature, particle size and, the stirring speed on the dissolution of the iron ore have been investigated. The dissolution rate depends on the hydrogen ion concentration and temperature of the reaction system. The mechanism of dissolution appears to follow an exothermic pathway. The activation energy for the dissolution reaction was 13.63 kJmol-1. About 92% of the total iron in the ore was dissolved within 120 min. by 12M HCl solution and 80°C using 0.1mm particle size. The optimum stirring speed was 300rpm. @JASE