Patil R.R.,Indian Institute of Technology Bombay |
Anurag Tilak C.J.K.,Aditya Birla Science and Technology Company Ltd |
Srivastava V.,Aditya Birla Science and Technology Company Ltd |
De A.,Indian Institute of Technology Bombay
Science and Technology of Welding and Joining | Year: 2011
Rapid electrode wear due to localised random alloying between copper and aluminium at high temperature is by far the greatest challenge for the resistance spot welding of aluminium alloys. An effective recourse would be to enhance the overall electrical conductivity along the electrode/ sheet interface to reduce the resistive heating of copper electrode and to prohibit direct contact between electrode and sheet during welding. We propose here the application of carbon black paste in fluidic form as a barrier along the electrode/sheet interface both for the enhancement of electrical conductivity and for the prohibition of direct electrode to sheet contact. Carbon black is chemically inert to both copper and aluminium and in fluidic form allows the enhancement of thermal and electrical conductance due to better conformability within a pressurised contact. The present experimental study has shown a significant enhancement in electrode life in the presenceof the carbon black based barrier coating along the interface. © 2011 Institute of Materials, Minerals and Mining.
Roy S.,Aditya Birla Science and Technology Co.
Mineral Processing and Extractive Metallurgy Review | Year: 2012
The performance of floc magnetic separation (FMS) has been compared with wet high-intensity magnetic separator (WHIMS). This study was performed on low-grade iron ore slime contained 59.58% Fe with 4.57% silica and 3.78% alumina. Detailed characterization data indicated that a substantial amount of the slime was below 20m in size. Beneficiation studies indicated that the FMS process is effective to recover fine hematite and goethite particles, compared with the conventional magnetic separation. In conventional magnetic separation, the extent of the fluid drag force exceeds the magnetic force exerted on ultrafine particles. Thus, ultrafine magnetic particles were usually not recovered effectively by magnetic separators, resulting in the loss of valuable ultrafine slime particles. The FMS process significantly increases the magnetic force on the ultrafine iron ore in the form of hydrophobic flocs in a magnetic field, thus the ultrafine particles can be picked up effectively as magnetic concentrates. The FMS process improved the Fe recovery from 37.35% to 79.60%. © 2012 Copyright Taylor and Francis Group, LLC.
Mathur P.C.,Aditya Birla Science and Technology Co.
Cement International | Year: 2014
The manufacture of Portland cement amounts to about 5 % of all anthropogenic CO2emissions There is a need for clinker substitution with lower carbon footprint materials with cementitious properties. One such lever is to increase the reactivity and amount of belite phase in cements. Using the current clinkenng based methodology, doping with flux and stabilizers appear to be the most feasible avenue However, employing less energy intensive processes, such as hydrothermal and sol-gel methods to synthesis reactive belite appears promising They offer important avenues to utilize relevant industrial wastes, lower CO2emissions and produce cements which have certain unique properties Another view is that one can promote the distributed model of cement production by setting up several small hydrothermal/sol-gel based production units spread across various geographies to cater for local markets, as opposed to large scale clinkering units present in few locations for large geographies.
Kumaresan T.,Aditya Birla Science and Technology Co.
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings | Year: 2012
The Bayer process used for refining bauxite to smelting grade Alumina serves as the linchpin of the Aluminum production industry worldwide. Even though the process is well established, the presence of impurities in the liquor affects the quality of product and imposes a major economic cost on the industry. This review article focuses on the issues pertaining to Gibbsitic (Al2O3.3H2O) precipitation circuit. The comprehensive review provides a basic understanding of the aluminum trihydrate precipitation and agglomeration phenomena. Crystal growth rate and agglomeration play a significant role in determining the output PSD of agglomerates. Hence, the effect of certain thermodynamic and hydrodynamic parameters along with the impact of impurities (oxalates, aldols, acids etc.) and additives on hydrate growth has been reviewed.
ADITYA BIRLA SCIENCE AND TECHNOLOGY COMPANY Ltd | Date: 2013-09-27
Methods and compositions useful for reducing the amount of sulfur in a composition comprising sulfur, including methods and compositions comprising the use of an oxidation agent and a oxidation catalyst, wherein the oxidation catalyst can have the formula M^(1)_(1-x)M^(3)_(x)M^(2)O_(3).
Aditya Birla Science and Technology Co. | Date: 2013-01-31
Titanosilicate catalyst is used in the oxidation reactions such as allylchloride epoxidation, phenol hydroxylation, Cyclohexanone ammoximation. During the reaction the catalyst is deactivated which further decrease in the efficiency of the oxidation reactions. The present invention provides a method for an efficient regeneration of catalyst titanosilicate catalyst at low temperature below 100 C. using a gaseous mixture containing ozone, without isolating the catalyst from the reactor system.
Aditya Birla Science and Technology Company Ltd | Date: 2012-07-20
The present invention provides a process for reinforced aluminum matrix composite. The aluminum matrix composite is reinforced with compound selected from the group consisting of Titanium carbide, Titanium boride, Vanadium and Zirconium compounds. The process is carried out pneumatically using pressurized carrier gas. The pressurized carrier gas also provides efficient stirring during the process which leads to uniform dispersion of the particulate in the aluminum matrix.
Aditya Birla Science and Technology Co. | Date: 2013-03-28
The present disclosure relates to a process for obtaining carbon black powder with a sulfur content of less than 0.07%. The process includes step of reacting carbon black powder with a sulfur content of 1-2% with an alkali metal or salt thereof, in a fluid media, at a temperature in the range of 100 C. to 350 C. and pressure in the range of 10 to 500 psig. It is found that in accordance with the process of the present disclosure, the sulfur content was reduced substantially from that of about 1.25% to that of 0.05%, resulting in about 96% desulfurization.
Aditya Birla Nuvo Ltd and Aditya Birla Science And Technology Co. | Date: 2011-11-28
A urea-based slow-release fertilizer composition comprising an alkaline oil component and a urea component, wherein, the alkaline oil component is coated on the urea component, such that the ratio of the alkaline oil component to the urea component is in the range of 0.01:100 to 0.1:100. The fertilizer is cost-effective, easy-to-use, and its quality is maintained during storage and transport.
Sonthalia R.,Aditya Birla Science and Technology Company Ltd |
Behara P.,Aditya Birla Science and Technology Company Ltd |
Kumaresan T.,Aditya Birla Science and Technology Company Ltd |
Thakre S.,Aditya Birla Science and Technology Company Ltd
International Journal of Mineral Processing | Year: 2013
The Bayer process used for refining bauxite to smelting grade alumina serves as the linchpin of the Aluminum production industry worldwide. Even though the process is well established, the presence of impurities in the liquor affects the quality of product and imposes a major economic cost on the industry. This review article focuses on the issues pertaining to Gibbsitic (Al2O3.3H2O) precipitation. The comprehensive review provides a basic understanding of the aluminum trihydrate precipitation and agglomeration phenomena. Crystal growth rate and agglomeration play a significant role in determining the output particle size distribution (PSD) of agglomerates. Hence, the effect of certain thermodynamic and hydrodynamic parameters along with the impact of natural impurities and additives (artificial impurities) on hydrate growth has been reviewed. © 2013 Elsevier B.V. © 2013 Elsevier Ltd. All rights reserved.