| Tata Steel Limited Patent applications |
| Patent application number | Title | Published |
|---|
| 20120024516 | Method and Apparatus for Achieving Higher Cooling Rates of a Gas During Bypass Cooling in a Batch Annealing Furnace of Cold Rolling Mills - A method and apparatus to increase the cooling rate of gas used in a batch annealing furnace of cold rolling mills under bypass cooling. The invention makes use of the higher heat transfer capacities of nanocoolants developed by a high-shear mixing of nanoparticles and stabilizers in a basic aqueous medium for cooling heated hydrogen flowing through a heat exchanger during bypass cooling of the batch annealing furnace. The nanofluid is prepared in a nanofluid preparation unit. | 02-02-2012 |
| 20110179702 | Method of Recovery of Organic Solvents Required in Refining of Coal - A method of recovery of organic solvents required in the refining of coal comprising: mixing solvent, co-solvent and coal to form a slurry; thermally treating the slurry under pressure and high temperature to form a coal-extract; passing the coal-extract through a membrane under high pressure in an ultra filtration unit to achieve recovery of a major part of the solvent; contacting the remaining thick clarified liquid from the membrane with water to obtain precipitated coal in a slurry with a mixture of water and organic solvent; feeding the slurry to a filter to get clean coal of very low ash content as a residue and a mixture of water and organic solvent as a filtrate; distilling the filtrate to separate the balance of the organic solvent from the water. The application of a membrane for filtration minimizes the heat requirement to establish economy. | 07-28-2011 |
| 20110138687 | Beneficiation Process to Produce Low Ash Clean Coal from High Ash Coals - An improved beneficiation process to produce low ash clean coal from high ash coals, comprising: preparing a coal slurry from fine coal and water and discharging it to a first reactor; preparing an alkali solution of NaOH and water and discharging it to a first reactor; carrying-out a leaching reaction between the coal and the alkali solution inside the first reactor; transferring the reaction mixture to a second reactor for filtration and washing to produce a filter cake; preparing a diluted acid solution in a second tank and delivering it to a second reactor; preparing a diluted alkali solution in a third tank and delivering it to a second reactor; feeding a coal slurry prepared from the filter cake into the second reactor for washing and transferring to a second filtration unit; transferring the product after filtration to a third reactor; carrying-out different leaching reaction sequences in the first, second, and third reactors; and transferring to a fifth tank the treated coal filter cake for drying. | 06-16-2011 |
| 20110091654 | ANTI-CORROSIVE HYBRID SOL-GEL FILM ON METALLIC SUBSTRATES AND METHOD OF PRODUCING THE SAME - This invention relates to a method of preparing anti-corrosive hybrid sol-gel film coating on zinc or zinc alloy coated metallic substrates comprising the steps of preparing a mixture of sol-gel from hydrolisable silicon alkoxides, sodium venadate solution combined with colloidal silica in a beaker and vigorously stirred; adding within 20 seconds of two separated phase formation between silica precursors and colloidal silica acetic acid or dilute nitric acid as a catalizer to initiate hydrolysis reaction of silicon alkoxides and condensation reaction in the sol gel composition, continuously stirring the mixture for about 24 hours to form a single phase solution, applying the solution on cleaned zinc or zinc alloy coated metal substrates to form a transparent sol-gel coating film and drying the coated substrates at 50° to 200° C. for 10 to 60 minutes. | 04-21-2011 |
| 20110027133 | Set-Up For Production Of Hydrogen Gas By Thermo-Chemical Decomposition Of Water Using Steel Plant Slag And Waste Materials - A system for producing hydrogen gas by the thermo-chemical decomposition of water, comprising a graphite crucible containing molten slag, a reaction hood disposed over the crucible, a water line for spraying water on the molten slag, and a steel tube for collecting and transferring the produced hydrogen gas from the hood to a condenser tank. | 02-03-2011 |
| 20100326895 | Cyclone for Dense Medium Separation - This invention relates to a cyclone for dense medium separation that includes an inverted conical shaped cyclone body which provides an interior space having an inner wall surface a vortex finder including a lower end that extends longitudinally into an upper region of the interior space of the cyclone body an overflow outlet associated with an upper end of the vortex finder a feed inlet that is in fluid communication with the upper region of the interior space of the cyclone body an outlet associated with a lower region of the interior space and the inner wall surface of the interior space curves inwardly and downwardly from the upper region curves inwardly and downwardly from the upper region of the interior space to the lower region of the interior space. | 12-30-2010 |
| 20100307054 | Development of a Techno-Economic Process for Organo Refining of Coal - An improved organo-refining process to produce low ash clean coal from high ash coal, comprising: mixing coal, solvent and a co-solvent to produce a slurry; feeding the slurry to a reactor by pumping; extracting a coal-solvent mixture from the reactor; feeding the extracted mixture to a flasher unit; recovering about 30% of the solvent from the flashing unit; feeding the remaining heavy material to an evaporator; extracting about 60% of solvent from the evaporator; discharging the residue from the evaporator to a precipitator having water which produces a coal slurry; filtering the slurry in a rotary drum; collecting the super clean coal as a residue and feeding the filtrate into a distillation unit; and separating the water and the organic material in the filtrate to recover at least 7 to 8% of the remaining solvent. | 12-09-2010 |
| 20100181520 | BLENDED FROTHER FOR PRODUCING LOW ASH CONTENT CLEAN COAL THROUGH FLOTATION - An improved frothing agent adaptable to froth flotation process to enhance coal selectivity for separation and efficiency of the forth flotation process comprises:- | 07-22-2010 |
| 20100111826 | Set-Up for Production of Hydrogen Gas By Thermo-Chemical Decomposition of Water Using Steel Plant Slag and Waste Materials - A novel method for producing hydrogen gas from water comprising adding water to the slag and carbonaceous flux to produce hydrogen by thermo-chemical decomposition of water. | 05-06-2010 |
| 20090220410 | Method for Producing Hydrogen and/or Other Gases from Steel Plant Wastes and Waste Heat - A method for producing hydrogen and/or other gases from steel plant wastes and waste heat is disclosed. The method comprises the steps of providing molten waste from steel plant like molten slag in a reactor. The molten slag is contacted with water and/or steam in the presence of a reducing agent to form a stream of hydrogen and/or other gases. The hydrogen and/or other gases can then be extracted from the stream of gases from the reactor. | 09-03-2009 |
