scholarly journals Physico - Chemical and Morphologic Structural Characterization of the Red Mud Obtained in the Romanian Alumina Plant

2019 ◽  
Vol 70 (2) ◽  
pp. 565-570
Author(s):  
Vasile Georgescu ◽  
Mihaela Bombos ◽  
Catalina Calin ◽  
Dorin Bombos
Keyword(s):  
Red Mud ◽  
Waste Product ◽  
Morphological Structure ◽  
Dispersion Analysis ◽  
Average Chemical Composition ◽  
Alumina Production ◽  
Distribution Method ◽  
Research Activities ◽  
Physico Chemical

The red mud is the main insoluble waste product from the manufacture of alumina by the Bayer hydrometallurgical process. Due to the accumulation in large quantities (0.8-1.2 metric tons waste / 1 metric ton of alumina) with a relatively high content of residual alkali and small granulation, it has been subject to many research activities, especially related to the techniques of neutralizing and enhancing its reuse under the form of various subproducts. This paper presents the results of the work undertaken by the collective of authors to evaluate the physico-chemical and morphological structure of red mud resulting from alumina production. The physico-chemical and morphological structure were analyzed using complex analytical methods (ICP-AES/OES, DCP, AAS, EDS-EDAX, SEM, DTAC, XRF, XRD, optical microscopy). The aim was to identify potentially active compounds for various environmental applications. To estimate the average chemical composition, by element, we used dispersion analysis, through the Gauss normal distribution method.

scholarly journals A Study of the Potential Use of Red Mud to Obtain Compositions Based on Portland Cement

2020 ◽  
Author(s):  
Ekaterina Gerasimova ◽  
Elizaveta Gumirova
Keyword(s):  
Portland Cement ◽  
Red Mud ◽  
Waste Product ◽  
Cement Stone ◽  
Mathematical Planning ◽  
Alumina Production ◽  
Mineral Additive ◽  
Composition Properties ◽  
Planning Of Experiments ◽  
Potential Use

The paper deals with the problem of utilization of red mud which is a waste product from alumina production using the Bayer method. The principal possible use for the red mud of JSC “Bogoslovsky aluminum plant” (Sverdlovsk region) for the compositions based on Portland cement is shown. It was found that the mud introduction accelerates beginning of the cement paste setting and thickens the paste reducing its mobility. It is concluded that the introduction of red mud up to 30 % is justified in terms of strength indicators. The work is carried out using mathematical planning of experiments. Keywords: red mud, Portland cement, active mineral additive, composition, properties, bauxite, chemical composition, cement stone strength, mathematical planning of experiments

Comprehensive Utilization of Red Mud Remaining in Alumina Production

2014 ◽  
Vol 881-883 ◽  
pp. 663-666 ◽  
Author(s):  
Ao Ping He ◽  
Zhi Liu Hu ◽  
De Guang Cao ◽  
Jian Min Zeng ◽  
Bo Lin Wu ◽  
...  
Keyword(s):  
Red Mud ◽  
Aluminum Industry ◽  
Construction Materials ◽  
Environmental Restoration ◽  
Alumina Production ◽  
The Sustainable Development ◽  
Valuable Metals ◽  
High Alkalinity ◽  
Main Factors

Red mud is a solid waste which is generated in the process of alumina production and is of highly alkaline. Red mud has very complex compositions, but contains a variety of rare and valuable metals. In addition, its high alkalinity is a severe pollution to water, land, air and environment, which has been one of the main factors to affect the sustainable development of aluminum industry. The characterization of red mud, the extraction of valuable metals from red mud, the utilization of red mud in construction materials, environmental restoration materials and other fields are introduced in this paper.

scholarly journals Physico-chemical characterization of slag occurrences at Tilva Njagra locality, Bor region, Eastern Serbia

2005 ◽  
Vol 41 (1) ◽  
pp. 127-133
Author(s):  
Dragana Zivkovic ◽  
Nada Strbac ◽  
M. Cocic ◽  
V. Andric ◽  
M. Steharnik ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Chemical Characterization ◽  
Research Activities ◽  
Physico Chemical

Physico-chemical characterization of slag occurrences at Tilva Njagra locality (Bor region, Eastern Serbia) was done and the results of the research activities are presented in this paper. The samples were investigated using chemical analysis, XRD, DTA and EDXRF.

scholarly journals Hexavalent Chromium Adsorption on Magnetic Nanoparticles Synthesized from Tay Nguyen Red Mud from Vietnam

2020 ◽  
Vol 32 (3) ◽  
pp. 602-606
Author(s):  
Pham Thi Mai Huong ◽  
Truong Anh Thu ◽  
Chu Qui Thuong ◽  
Tran Hong Con ◽  
Nguyen Thi Huong
Keyword(s):  
Hexavalent Chromium ◽  
Fe3o4 Nanoparticles ◽  
Red Mud ◽  
Kinetic Data ◽  
Waste Product ◽  
Precipitation Method ◽  
Diffraction Field ◽  
Silicon Iron ◽  
Alumina Production ◽  
Free Environment

Tay Nguyen red mud abundantly found in Vietnam, is a waste product of alumina production formed during processing of bauxite. It is rich in aluminate, residual alkaline, and oxides, such as silicon, iron, and titanium oxides. Iron oxide, which constitutes 45-55 % of Tay Nguyen, is useful for Fe3O4 nanoparticles synthesis. In this study, a Fe3O4 nanoparticles were synthesized using Tay Nguyen by the chemical co-precipitation method, which required a non-oxidizing oxygen-free environment. Fe3O4 nanoparticles were characterized using X-ray diffraction, field emission scanning electron microscopy, Brunauer-Emmett-Teller analysis, and vibrating-sample magnetometry. Adsorption of hexavalent chromium by the nanocomposite was conducted under batch conditions. Pseudo-second-order equations were used to describe kinetic data of adsorption reactions; the equations were fitted to kinetic data as shown by the results. The isotherms of adsorption were also studied using the linear forms of the Langmuir and Freundlich equations. The Langmuir equation exhibited higher linear correlation with the experimental data than the Freundlich equation did. The maximum monolayer coverage, qmax at 297 K was 31.44 mg/g.

Laboratory Methods for the Physico-Chemical Characterization of Recombinant Allergens as Reference Standards

Alergologia ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 7
Author(s):  
Mariana Vieru ◽  
Florin-Dan Popescu ◽  
Laura Haidar ◽  
Carmen Bunu-Panaitescu
Keyword(s):  
Chemical Characterization ◽  
Reference Standards ◽  
Recombinant Allergens ◽  
Laboratory Methods ◽  
Physico Chemical

Mineralogical and physico-chemical characterization of a sintered feldspathic sand

2010 ◽  
Vol 35 (5) ◽  
pp. 261-267 ◽  
Author(s):  
Wissemn Gallala ◽  
Mohamed Essghaier Gaied ◽  
Borhen Kchaou
Keyword(s):  
Chemical Characterization ◽  
Physico Chemical

Physical - Chemical Issues of Cephalosporin Intercalated Nanoparticles for Life - Threatening Infections Treatment

2001 ◽  
Vol 71 (3) ◽  
pp. 342-349
Author(s):  
Lucian Eva ◽  
Letitia Doina Duceac ◽  
Liviu Stafie ◽  
Constantin Marcu ◽  
Geta Mitrea ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Advanced Characterization ◽  
Generation Cephalosporin ◽  
Fourth Generation ◽  
Exchange Method ◽  
Physico Chemical ◽  
Life Threatening ◽  
Double Hydroxide ◽  
Double Hydroxides

The fourth generation cephalosporin antibacterial agent, cefepime, was loaded into layered double hydroxides for enhancing antibiotic efficiency, reducing side effects, as well as achieving the sustained release property. The intercalation of antibiotic into the inter-gallery of ZnAl-layered double hydroxide (LDH) was carried out using ion exchange method, by this constituting a nano-sized organic-inorganic hybrid material for a controlled release novel formulation. Although cefepime is a broad spectrum antibiotic, it has various adverse effects and a significant degradation rate. Thus, the preparation and physico-chemical characterization of nanomaterials able to intercalate this drug is an important study for medical and pharmaceutical field. The antibiotic inclusion into LDHs nanostructure was confirmed by advanced characterization techniques and the release profile of cefepime was analysed with the respect to pH of the simulated media.

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