scholarly journals Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 469
Author(s):  
Dmitry Zinoveev ◽  
Pavel Grudinsky ◽  
Ekaterina Zhiltsova ◽  
Darya Grigoreva ◽  
Anton Volkov ◽  
...  
Keyword(s):  
High Pressure ◽  
Acid Concentration ◽  
Red Mud ◽  
Acid Leaching ◽  
Dissolution Behavior ◽  
Liquid Ratio ◽  
Iron Aluminum ◽  
Two Samples ◽  
Alumina Industry ◽  
Pressure Acid Leaching

Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid leaching using 10 to 20% HCl of two samples of non-magnetic tailings obtained by 60 min carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt.% of red mud and 15.4 wt.% Na2SO4 at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. The influence of temperature, leaching duration, solid-to-liquid-ratio and acid concentration on the dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr was studied. Based on the investigation of the obtained residues, a mechanism for passing valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed.

scholarly journals Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminium and Other Valuable Components from the Non-Magnetic Residues Obtained from Red Mud after Iron Removal

2021 ◽  
Author(s):  
Dmitry Zinoveev ◽  
Pavel Grudinsky ◽  
Ekaterina Zhiltsova ◽  
Darya Grigoreva ◽  
Anton Volkov ◽  
...  
Keyword(s):  
High Pressure ◽  
Red Mud ◽  
Acid Leaching ◽  
Dissolution Behavior ◽  
Optimal Conditions ◽  
Liquid Ratio ◽  
Iron Aluminum ◽  
Two Samples ◽  
Alumina Industry ◽  
Pressure Acid Leaching

Red mud is a hazardous waste of alumina industry that contains high amounts of iron, aluminum, titanium and REEs. One of the promising methods for the extraction of iron from red mud is car-bothermic reduction with the addition of sodium salts. This research focuses on the process of hy-drochloric high-pressure acid leaching using 10–20% HCl of two samples of non-magnetic tailings obtained by 60-minute carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt. % of red mud and 15.4 wt. % Na2SO4 at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. An influence of temperature, leaching duration, solid-to-liquid-ratio and acid con-centration on dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr were studied. Based on the investigation of the obtained residues, mechanism of passing of valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed.

Optimization of Nickel Chemical Extraction from Hazardous Residue

2016 ◽  
Vol 14 (1) ◽  
pp. 175-183 ◽  
Author(s):  
Mahdi Gharabaghi ◽  
Amirreza Azadmehr
Keyword(s):  
Reaction Time ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Quadratic Model ◽  
Chemical Extraction ◽  
Liquid Ratio ◽  
Nickel Extraction ◽  
Process Factors ◽  
Solid Liquid ◽  
Significant Factors

AbstractStatistical design of experiments was used for design and analysis of nickel extraction from hazardous waste. Sulphuric acid leaching of zinc plant residue has been performed for monitoring and evaluating the effects of process factors on the nickel leaching yield. Factorial design was planned first in order to study the effect of six process factors and screen main variables. These factors were reaction time, acid concentration, solid-liquid ratio % (w/v), particle size, stirring speed and reaction temperature. The main factors and their interaction were studied by analysis of variance (ANOVA), and the results showed that the reaction time, acid concentration and solid-liquid ratio were the most significant factors. In the second set of experiments, response surface methodology (RSM) was used for modelling and optimisation of significant factors. Quadratic model was derived for the prediction of nickel extraction. The optimum values for maximum nickel was identified to be a leaching time of 30 min, acid concentration 10% (V/V) and solid liquid ratio of 10%. Using these optimum conditions, more than 94% nickel was extracted. In addition the results of model equation showed a good agreement with the experimental data.

scholarly journals Optimization of Nitric Acid Leaching of Rare Earth Elements From Moroccan Natural Phosphate

2020 ◽  
Vol 13 (1) ◽  
pp. 1
Author(s):  
Marouane Amine ◽  
Fatima Asafar ◽  
Latifa Bilali ◽  
Mehdi Nadifiyine
Keyword(s):  
Rare Earth ◽  
Nitric Acid ◽  
Rare Earth Elements ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Optimal Conditions ◽  
Liquid Ratio ◽  
Experimental Conditions ◽  
Nitric Acid Leaching ◽  
Solid Liquid

Phosphate is a very important natural resource in Morocco and one of the secondary resources of rare earth elements. Our study is particularly interested in Youssoufia phosphate, which contains 228.77 ppm of rare earth elements (ΣREEs). The purpose of our work is to study the influence of different parameters (acid concentration, solid/liquid ratio and temperature) in order to determine the optimal conditions for the leaching of rare earths. An experimental design (Doehlert matrix) has been drawn up to optimize the experimental conditions of the leaching. All tests were made with nitric acid at different concentrations varying between 1.5M and 4.5M with a solid/liquid ratio of 1/12 to 1/6; reaction temperature and duration are respectively 20°C to 80 °C and 60 min. The optimal conditions are obtained when using 69 °C as temperature, 4.1 M as acid concentration and 1/9 as solid/liquid ratio.

scholarly journals High Pressure Acid Leaching of Co Matte Converted from Co Concentrate

2016 ◽  
Vol 57 (10) ◽  
pp. 1753-1758
Author(s):  
Gunha Kim ◽  
Ga-hee Kang ◽  
Sangjun Kim ◽  
Sookyung Kim ◽  
Jeongsoo Sohn ◽  
...  
Keyword(s):  
High Pressure ◽  
Acid Leaching ◽  
Pressure Acid Leaching

Recycling Red Mud of JSC Ural Aluminum Plant with the Recovery of Iron and Construction Materials

2017 ◽  
Vol 743 ◽  
pp. 331-337 ◽  
Author(s):  
Dmitry Zinoveev ◽  
Pavel Grudinsky ◽  
Vladimir Korneev ◽  
Valery Dyubanov ◽  
Mark Zheleznyi
Keyword(s):  
Rare Earth ◽  
Construction Industry ◽  
Red Mud ◽  
Rare Earth Metals ◽  
Construction Materials ◽  
Pig Iron ◽  
Iron Aluminum ◽  
Landfill Sites ◽  
Reduction Smelting ◽  
Alumina Industry

Red mud is a by-product of alumina industry which is currently almost completely stored in landfill sites without further use. It contains considerable amounts of valuable components such as iron, aluminum, titanium and rare-earth metals. The reduction smelting of red mud was carried out in laboratory scale to recover iron and obtain slag suitable for use in the construction industry. It has been shown that it is expedient to obtain pig iron and slag from the unprocessed red mud. Those two are suitable for the subsequent leaching of aluminum, titanium and rare-earth metals. It is practical to process dealkalized red mud, with composition adjustment by CaO and Al2O3 addition, in order to obtain pig iron and slag in the form of aluminous clinker.

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