Dissolution kinetics of natural magnesite in acetic acid solutions

Laçin, Oral; Dönmez, Bünyamin; Demir, Fatih

doi:10.1016/j.minpro.2004.05.002

Cited by 81 publications

(31 citation statements)

References 11 publications

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“…They may be an attractive extracting agent because the extraction can be performed under mildly acidic conditions. Additionally, in industrial processes, organic acids cause a lesser corrosion effect (Laç in et al, 2005) …”

Section: Introductionmentioning

confidence: 99%

Dissolution kinetics of ulexite in acetic acid solutions

Ekmekyapar

Demirkıran

Künkül

2008

Chemical Engineering Research and Design

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Section: Introductionmentioning

confidence: 99%

Dissolution kinetics of ulexite in acetic acid solutions

Ekmekyapar

Demirkıran

Künkül

2008

Chemical Engineering Research and Design

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“…2 Different leaching agents, such as inorganic acids, 3-6 organic acids, [7][8][9][10][11][12] and inorganic salts [13][14][15][16] have been used for the dissolution of magnesium from magnesite or calcined magnesite. When inorganic acids, such as H 2 SO 4 , HNO 3 , or HCl, were used as leaching agents, some undesired impurities, such as Ca, Fe, Si, and Al, were also appreciably dissolved in the leaching process, which caused adverse effects on subsequent handling and affected the quality of the MgO product.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic studies of the MgCl₂‐NH₄Cl‐NH₃‐H₂O system for the production of high purity MgO from calcined low‐grade magnesite

Wang

Park

et al. 2015

AIChE Journal

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To improve the overall sustainability of MgO-based refractory production, a novel process to produce high purity MgO from calcined low-grade magnesite in ammonium chloride solution was developed. The process was designed on the basis of the phase equilibria of the NH 4 Cl-MgCl 2 -NH 3 -H 2 O system obtained using the Mixed Solvent Electrolyte model embedded in OLI software. The optimum calcination temperature of low-grade magnesite was determined to be 650 C in terms of the conversion ratio of magnesium and calcium in the leaching experiments. An apparent activation energy of Mg extraction was 30.98 kJ/mol, which is slightly lower than that of Ca leaching. An empirical kinetic model of magnesium extraction was also developed to describe the effects of NH 4 Cl concentration, particle size of calcined magnesite, and solid-to-liquid ratio on the extent of extraction of magnesium. At leaching time of 10 min, the leachate with high Mg/Ca molar ratio was obtained. Then, MgO with a purity of 99.09% was produced through the decomposition of intermediate 4MgCO 3 ÁMg(OH) 2 Á4H 2 O. V C 2015 American Institute of Chemical Engineers AIChE J, 61: 1933AIChE J, 61: -1946AIChE J, 61: , 2015 Keywords: kinetic, thermodynamic, solid-liquid reaction, low-grade magnesite, ammonium chloride IntroductionMagnesite ore is the basic raw material for the manufacturing of MgO-based refractories. The explored magnesite reserves in China amount to about 3 3 10 10 tons in the 27 mining areas.1 About 87% of these resources are located in the Eastern part of Liaoning Province, China. There exist about 30 major producers of light-burned (caustic-calcined) and hard-burned magnesia from high grade magnesite, that is, magnesite with at least 45 wt % of MgO and a low content of silicate and calcium impurities (<2%). It is estimated that the annual production capacities of light-burned magnesia and hard-burned magnesia are about 2.7 3 10 6 tons and 3.3 3 10 6 tons, respectively. Unfortunately, low-grade magnesite, that is, magnestite with <44 wt % MgO and a high content of silicate and calcium impurities (>2%), is not fully utilized, which results in a large deposit of mineral tailings (fine powders). This limits the use of magnesite resources and also causes environmental issues. Therefore, an effective method of processing low-grade magnesite has been sought after to produce high value-added products, such as high purity MgO.Various methods of MgO production from low-grade magnesite have been proposed. Among these methods, the hydrometallurgical method is considered to be most effective in terms of energy and environmental standpoints.2 Different leaching agents, such as inorganic acids, 3-6 organic acids, [7][8][9][10][11][12] and inorganic salts [13][14][15][16] have been used for the dissolution of magnesium from magnesite or calcined magnesite. When inorganic acids, such as H 2 SO 4 , HNO 3 , or HCl, were used as leaching agents, some undesired impurities, such as Ca, Fe, Si, and Al, were also appreciably dissolved in the leaching process, whi...

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“…The results from previous studies indicated that organic acids, such as citric acid, acetic acid and glucose acid, could be employed as beneficial leaching reagents [15]. Their aqueous solutions are all mildly acidic [15][16][17]. A leaching solution with low impurity content could be obtained by mild acids and their salts because of the dissolution selectivity of minerals [18].…”

Section: Introductionmentioning

confidence: 99%

Dissolution Kinetics of Zinc Oxide Ore with an Organic Acid

Deng¹,

Sun²,

Lin³

et al. 2015

Int J Metall Mater Eng

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In this study, the dissolution kinetics of smithsonite as an alternative zinc source in trichloroacetic acid (TCA) solution was investigated. TCA can be derived from industrial waste acid in the pharmaceutical, biotechnology and chemical fields. Results showed that the dissolution kinetics conformed to the shrinking core model controlled by surface chemical reaction. The apparent activation energy of the reaction was calculated as 47.61 kJ/mol, indicating the obvious effect of temperature on the reaction rate. The reaction kinetic equation associated with the main influencing factors was eventually established as 1-(1-x) -1/3 = [0.0002 (C) 0.384 (P) 0.969 exp(-5726T)] t. The high reaction speed of smithsonite in TCA solution shows that TCA has a dissolution effect on zinc oxide ores; thus, it can be employed as an advantageous organic leaching reagent environmentally friendly. In addition, the experimental parameters obtained provide basic data and reference for the leaching of other carbonate minerals of copper, zinc, lead and cobalt, among others, in an organic acid system.

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Dissolution kinetics of natural magnesite in acetic acid solutions

Cited by 81 publications

References 11 publications

Dissolution kinetics of ulexite in acetic acid solutions

Dissolution kinetics of ulexite in acetic acid solutions

Thermodynamic and kinetic studies of the MgCl₂‐NH₄Cl‐NH₃‐H₂O system for the production of high purity MgO from calcined low‐grade magnesite

Dissolution Kinetics of Zinc Oxide Ore with an Organic Acid

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Dissolution kinetics of natural magnesite in acetic acid solutions

Cited by 81 publications

References 11 publications

Dissolution kinetics of ulexite in acetic acid solutions

Dissolution kinetics of ulexite in acetic acid solutions

Thermodynamic and kinetic studies of the MgCl2‐NH4Cl‐NH3‐H2O system for the production of high purity MgO from calcined low‐grade magnesite

Dissolution Kinetics of Zinc Oxide Ore with an Organic Acid

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Thermodynamic and kinetic studies of the MgCl₂‐NH₄Cl‐NH₃‐H₂O system for the production of high purity MgO from calcined low‐grade magnesite