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.
Roy S.,Aditya Birla Science and Technology Co. |
Mandal S.K.,Indian National Metallurgical Laboratory |
Das A.,Indian National Metallurgical Laboratory
Mineral Processing and Extractive Metallurgy Review | Year: 2014
Gravity concentration in a liquid fluidized bed floatex density separator (FDS) was investigated through high-speed videography and image analysis. Process performance in terms of yield and grade of the product for fine coal beneficiation in the FDS was established experimentally. The feed coal (-1.18 mm) with 36% ash was enriched to 24% ash at a mass yield of 65%. Coarsest underflow with a d50 of 700 μm was obtained at 5.8 kPa bed pressure, 120 kg/h feed rate, and 12 lpm teeter water flow. The lowest SG 50 of 1.62 was obtained at 5.4 kPa, 15 lpm, and 80 kg/h. At 9 lpm water flow, steady state was achieved in 400 sec when the voidage and suspension density distributions became constant. From the suspension density distribution, the SG50, 1.69 under this set of conditions, was estimated with reasonable accuracy. Increase in teeter water was shown to increase the time required for attaining steady state. It was established that particle size distribution at the bottom of the bed in the column offers a good indication of the separation performance. The influences of the operating variables on the axial steady state profile of the suspension density and voidage were also established. Image analysis is shown to be quite useful in collecting quantitative transient and steady state data that may be difficult to obtain otherwise. The process performances were adequately described using such transient and steady state observations. © 2013 Taylor and Francis Group, LLC.
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 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