Extraction and applications of aluminum hydroxide from bauxite for commercial consumption

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Solvent Extraction ◽  
Aluminum Hydroxide ◽  
Red Mud ◽  
Spectrophotometric Analysis ◽  
Recycling Process ◽  
Smelting Method ◽  
Ft Ir ◽  
Bauxite Ore ◽  
Magnetic Recovery ◽  
Clear Solution

Bauxite ore was collected from Khyber Pakhtun Khawa (KPK), Pakistan for extraction of aluminum in the form of aluminum hydroxide. The ore consists of 31.11% aluminum and other minerals (SiO2, Fe2O3, Na2O, CaO) was leached with alkaline solution. The aluminum extraction in the form of aluminum hydroxide from the clear solution in filtrate was successfully done by different processes involving autoclave, centrifuge and solvent extraction while the red mud in the form of residue was separated and recycled. The recycling process of iron from red mud was divided into roasting magnetic recovery, the reducing smelting method for iron separation. After extraction the composition of Al, Fe, Si, and Ca were determined from aluminum hydroxide and red mud both by chemical and spectrophotometric analysis. The compound was further characterized by FT-IR and results showed that a considerable amount of aluminum in the form of aluminum hydroxide was extracted along with other minerals.

Assessment of Naturally Occurring Radioactive Materials (NORM) in Mining Residues and Environmental Material from Sefwi, Awaso Bauxite Mine

2021 ◽  
Author(s):  
Matjele Moipone ◽  
Oscar K. Adukpo ◽  
Joseph B. Tandoh
Keyword(s):  
Effective Dose ◽  
Water Samples ◽  
Red Mud ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Activity Levels ◽  
Environmental Material ◽  
Bauxite Ore ◽  
Mining Residues ◽  
Bauxite Mine

Abstract Gamma ray spectrometry was used to quantify level of NORM in mining residues sampled at Awaso bauxite mine and surrounding communities. The radionuclides of interest were 238U, 232Th and 40K and the radioactivity levels were determined in soil, bauxite ore, red mud and water samples from wells. The radioactivity concentrations in soil, bauxite ore and red mud 238U, 232Th and 40K were 18.01±1.96 Bqkg-1, 19.07±2.12 Bqkg-1 and 103.21±1.74 Bqkg-1; 39.42±4.18 Bqkg-1, 97.32±10.63 Bqkg-1 and 14.68±1.82 Bqkg-1; 44.85±4.79, 64.23±6.58 and 125.30±18.72 Bqkg-1. The activity levels for both 232U and 232Th were above world-wide average values while Potassium-40 levels were lower. The mean activity concentration values of 238U, 232Th and 40K in water samples were 1.49±0.45 Bql-1, 3.68±0.69 Bql-1 and 15.69±0.28 Bql-1 respectively and were within the world average activity concentrations except for bauxite ore and red mud. The committed effective dose was 0.74 mSv and annual effective dose estimated to be 0.136 mSv which is below recommended dose limit of 1 mSvyear-1 for public exposure.

Preparation of a Uranium Conversion Plant’s Nuclear Waste for Final Disposal by Means of Magnetically Assisted Chemical Separation

2013 ◽  
Vol 3 (1) ◽  
pp. 8-18
Author(s):  
Ahad Ghaemi ◽  
Mehdi Maghsudi ◽  
Fatemeh Hanifpour ◽  
Mohammad Samadfam
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Nuclear Waste ◽  
Chemical Separation ◽  
Extraction Process ◽  
Uranium Content ◽  
Extraction Yield ◽  
Solvent Extraction Plant ◽  
Ft Ir ◽  
Co Precipitation

Uranium is separated from the raffinate of Isfahan’s uranium conversion solvent extraction process by means of solvent coated magnetic nanoparticles. These particles were synthesized via chemical co-precipitation and were analyzed by XRD, TEM and TGA methods. The particles’ surface were modified with D2EHPA and analyzed with FT-IR method. The results revealed that 0.5 M nitric acid and 25% w/w D2EHPA on nanoparticles gives the maximum uranium extraction yield. The raffinate of the solvent extraction plant can be disposed safely after its uranium content reduces to the allowable values.

Effect of Calcined Red Mud Addition on the Hydration of Portland Cement

2012 ◽  
Vol 727-728 ◽  
pp. 1408-1411 ◽  
Author(s):  
Daniel Véras Ribeiro ◽  
João A. Labrincha ◽  
Márcio Raymundo Morelli
Keyword(s):  
Portland Cement ◽  
Red Mud ◽  
Setting Time ◽  
Cementitious Materials ◽  
Adiabatic Calorimeter ◽  
Hydration Process ◽  
Early Hydration ◽  
Bauxite Ore ◽  
Calorimetric Studies ◽  
Reference Mixture

The red mud (RM) is a solid waste derived from the processing of bauxite ore to produce alumina and it is considered a hazardous waste due to its high pH. This paper describes the use of mud untreated and after calcination at distinct temperatures (450, 650, and 1000°C) attempting to improve its reactivity. The Portland cement was replaced up to 30 wt% red mud, and its addition changed the hydration process, evaluated by calorimetric studies of early hydration and setting time. By comparing with the reference mixture (without red mud), the obtained results confirm the potential of the red mud to be used as pozzolanic additive to cementitious materials. Temperature of hydration was monitored by a quasi-adiabatic calorimeter (Langavant). The hydration temperature increases with RM addition, particularly if calcined in the same interval (450-650°C). In this condition, the hydration process is accelerated.

scholarly journals Effect of red mud addition on the corrosion parameters of reinforced concrete evaluated by electrochemical methods

2012 ◽  
Vol 5 (4) ◽  
pp. 451-467 ◽  
Author(s):  
D.V. Ribeiro ◽  
J.A. Labrincha ◽  
M.R. Morelli
Keyword(s):  
Electrical Resistivity ◽  
Reinforced Concrete ◽  
Red Mud ◽  
Corrosion Potential ◽  
Corrosion Process ◽  
Bayer Process ◽  
Alumina Production ◽  
High Ph ◽  
High Electrical Resistivity ◽  
Bauxite Ore

Red mud, the main waste generated in aluminum and alumina production from bauxite ore by the Bayer process, is considered "hazardous" due to its high pH. The high pH also provides greater protection of rebars, which is reflected in the low corrosion potential and high electrical resistivity (filler effect) of concrete. The corrosion potential was monitored by electrochemical measurements and the electrical resistivity was evaluated using sensors embedded in concrete test specimens. The results showed that the addition of red mud is beneficial to concrete, reducing its corrosion potential and increasing its electrical resistivity. Red mud proved to be a promising additive for concrete to inhibit the corrosion process.

FT-IR spectrophotometric analysis of dehydroepiandrosterone and its pharmaceutical formulation

Il Farmaco ◽  
2005 ◽  
Vol 60 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Andrei A. Bunaciu ◽  
Hassan Y. Aboul-Enein ◽  
Şerban Fleschin
Keyword(s):  
Spectrophotometric Analysis ◽  
Pharmaceutical Formulation ◽  
Ft Ir

scholarly journals Evaluating the efficiency of red mud material in removing NO2 gas

2017 ◽  
Vol 1 (T4) ◽  
pp. 222-231
Author(s):  
Linh Nhut Ho ◽  
Hien Thi To
Keyword(s):  
Sustainable Development ◽  
Aluminum Hydroxide ◽  
Red Mud ◽  
Gas Flow ◽  
Flow Speed ◽  
Hazardous Substance ◽  
Optimal Conditions ◽  
The Future ◽  
Pass Through ◽  
No2 Adsorption

The way of using red mud - a hazardous substance created from the producing of aluminum hydroxide in removing NO2 gas is perfectly suitable with sustainable development of society in the future. This study focuses on estimating the efficacy of two different materials on treating NO2 gas: pure red mud material (non-neutralised by seawater - RM1) and hydrotalcite material created from red mud with the participant of the seawater (Seawaterneutralised red mud - RM2). Experiments were made to survey the treating ability through various factors: concentrations of input NO2 gas, flow speed of NO2 gas pass through materials, mass of materials, temperature of material used in experiments and saturated time of materials have also been tested. The results showed that seawater-neutralised red mud and red mud material were potent in the NO2 adsorption. However, RM2 material had the higher treating ability of NO2 gas than RM1 about 5 %. The result showed that optimal conditions were determined at concentrations of input NO2 were 303–397 ppm, flow speed of NO2 gas pass through materials was 0.4L/min, 10 g mass of materials, temperature of material was 30 oC. The efficiency of treating NO2 gas of RM1 and RM2 are 89.50 % and 84.43 %, respectively. The results of this study showed that both seawater-neutralised red mud and red mud have the potential to remove NO2 gas.

Preparation of a Uranium Conversion Plant’s Nuclear Waste for Final Disposal by Means of Magnetically Assisted Chemical Separation

2014 ◽  
pp. 1483-1493
Author(s):  
Ahad Ghaemi ◽  
Mehdi Maghsudi ◽  
Fatemeh Hanifpour ◽  
Mohammad Samadfam
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Nuclear Waste ◽  
Chemical Separation ◽  
Extraction Process ◽  
Uranium Content ◽  
Extraction Yield ◽  
Solvent Extraction Plant ◽  
Ft Ir ◽  
Co Precipitation

Uranium is separated from the raffinate of Isfahan’s uranium conversion solvent extraction process by means of solvent coated magnetic nanoparticles. These particles were synthesized via chemical co-precipitation and were analyzed by XRD, TEM and TGA methods. The particles’ surface were modified with D2EHPA and analyzed with FT-IR method. The results revealed that 0.5 M nitric acid and 25% w/w D2EHPA on nanoparticles gives the maximum uranium extraction yield. The raffinate of the solvent extraction plant can be disposed safely after its uranium content reduces to the allowable values.

Recovery of scandium from red mud by leaching with titanium white waste acid and solvent extraction with P204

2021 ◽  
pp. 105724
Author(s):  
Jie Zhou ◽  
Shuyi Ma ◽  
Yedan Chen ◽  
Shunyan Ning ◽  
Yuezhou Wei ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Red Mud ◽  
Titanium White ◽  
Waste Acid
Sign in / Sign up

Export Citation Format

Share Document