Patents Assigned to Tata Steel Limited
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Publication number: 20140366432Abstract: A process for treating coal to obtain lower ash content coal including: (i) pretreating high ash coal in a pretreatment unit with ultrasonic waves or microwaves, (ii) forming a slurry of coal fines in a solvent solution including N-Methyl-2-pyrrolidone (NMP) and one of Ethylenediamine (EDA) or Monoethanolamine (MEA), (iii) maintaining said slurry in a refluxed condition at a temperature of about 170-190° C. for a period of about 15 minutes to 2 hours; (iv) separating the refluxed slurry into two parts consisting of extract and residue by coarse filtration, (v) recovering up to 85% of the solvent solution by evaporation of the extract to form a concentrated extract, (v) precipitating the coal by adding water to the concentrated extract, (vi) separating the coal from the water-extract solution by filtration, and (vii) recovering the rest of the solvent by distillation of the water-extract solution.Type: ApplicationFiled: September 4, 2012Publication date: December 18, 2014Applicant: Tata Steel LimitedInventors: Kumar Chandaliya Vimal, P. K Banerjee, D. K Sharma
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Patent number: 8900670Abstract: 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.Type: GrantFiled: May 23, 2008Date of Patent: December 2, 2014Assignee: Tata Steel LimitedInventors: Arun Kumar Singh, Tapan K. Rout, Ramanuj Narayan, Anil K. Verma, Nikhiles Bandyopadhyay, Nitu Rani
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Patent number: 8833562Abstract: A method for separating particles of different specific gravity from a sized ore feed, wherein the ore can be coal, metallic, non-metallic and mineral ores. The method particles from the ore are sieved to obtain size fractions of different particle size ranges, after which a load of particles of a size fraction are placed in a container and fluidized by passing a fluid flow through the load of particles. By lowering the flow velocity of the fluid through the load the particles are deposited in the container in one or more layers depending on the specific gravity of each of the particles, after which the deposited particles are separated in portions of different specific gravity. The portions represent different ore content of the particles in each portion on basis of which the theoretical yield of the ore can be determined. The invention provides an apparatus to carry out the method.Type: GrantFiled: November 15, 2010Date of Patent: September 16, 2014Assignee: Tata Steel LimitedInventors: Kumar Mukherjee Ashim, Barada Kanta Mishra
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Publication number: 20140245659Abstract: An industrial process for treating coal in a system to lower ash content, the system comprising first and second water storage tanks, a diesel storage tank, a thermic fluid heater, a thermic fluid storage tank, a thermic fluid pump, a heat exchanger, a thermic fluid expansion tank, a N2 gas cylinder, a reactor, a water pump, and a reflux condenser, the process comprising (i) forming a slurry of coal fines in a N-Methyl-2-pyrrolidone (NMP) with Ethylenediamine (EDA) solution, (ii) maintaining said slurry in the reactor at a temperature of 150° C. to 220° C. and at a pressure of 1 to 4 gauge (kg/cm) for about 1 to 3 hours, (iii) separating a sample of the slurry by coarse filtration in a filter cloth to obtain a filtrate/extract and a residue, (iv) precipitating the coal in water by adding concentrated extract, and (v) separating the coal by filtration.Type: ApplicationFiled: September 1, 2011Publication date: September 4, 2014Applicant: TATA STEEL LIMITEDInventors: Vimal KR. Chandaliya, Pinak Pani Biswas, PK Banerjee
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Publication number: 20140145381Abstract: 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.Type: ApplicationFiled: November 12, 2013Publication date: May 29, 2014Applicant: TATA STEEL LIMITEDInventors: Jayabrata Bhadurt, Deb Roy, Subhrakanti Chakraborty, Shantanu Chakraborty, Sumitesh Das, Debashish Bhattacharjee
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Publication number: 20140102600Abstract: The invention relates to a bainite steel consisting of the following elements in weight %: C: 0.25-0.55 Si: 0.5-1.8 Mn: 0.8-3.8 Cr: 0.2-2.0 Ti: 0.0-0.1 Cu: 0.0-1.2 V: 0.0-0.5 Nb: 0.0-0.06 Al: 0.0-2.75 N: <0.004 P: <0.025 S: <0.025 and a method for manufacturing a bainite steel strip that comprises the step of cooling the coiled strip of such composition to ambient temperature, during which the bainite transformation takes place.Type: ApplicationFiled: May 28, 2012Publication date: April 17, 2014Applicant: TATA STEEL LIMITEDInventors: Das Sourav, Kundu Saurabh, Halder Arunansu
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Patent number: 8647400Abstract: A beneficiation process to produce low ash clean coal from high ash coals, including: preparing a coal slurry from fine coal and water and discharging it to a first reactor; preparing an alkali solution and discharging it to a first reactor; carrying-out a leaching reaction 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 and delivering it to a second reactor; preparing a diluted alkali solution 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.Type: GrantFiled: June 5, 2009Date of Patent: February 11, 2014Assignee: Tata Steel LimitedInventors: Pratik Swarup Dash, Pradip Kumar Banerjee, Debashish Bhattachargee, Tridibesh Mukherjee, Saibal Ganguly
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Patent number: 8469197Abstract: An improved frothing agent adaptable to froth flotation process to enhance coal selectivity for separation and efficiency of the froth flotation process comprises: A blended mixture of Ketone (2,6-Dimethyl-4-Heptanone) 85-89% (Wt %) Ester molecule(Tetrahydrofurfuryl acetate) 10-12% (Wt %) Epoxide conditioner (1,2-Epoxydodecane) 0.25-0.30% (Wt %) Water 4.75-5.Type: GrantFiled: August 19, 2008Date of Patent: June 25, 2013Assignee: Tata Steel LimitedInventors: Ashiwani K. Gupta, Pradip Kumar Banerjee, Debashish Bhattacharjee
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Publication number: 20120305453Abstract: A method for separating particles of different specific gravity from a sized ore feed, wherein the ore can be coal, metallic, non-metallic and mineral ores. The method particles from the ore are sieved to obtain size fractions of different particle size ranges, after which a load of particles of a size fraction are placed in a container and fluidized by passing a fluid flow through the load of particles. By lowering the flow velocity of the fluid through the load the particles are deposited in the container in one or more layers depending on the specific gravity of each of the particles, after which the deposited particles are separated in portions of different specific gravity. The portions represent different ore content of the particles in each portion on basis of which the theoretical yield of the ore can be determined. The invention provides an apparatus to carry out the method.Type: ApplicationFiled: November 15, 2010Publication date: December 6, 2012Applicant: TATA STEEL LIMITEDInventors: Kumar Mukherjee Ashim, B. K. Mishra
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Patent number: 8262751Abstract: 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.Type: GrantFiled: June 5, 2009Date of Patent: September 11, 2012Assignee: Tata Steel LimitedInventors: Pinakpani Biswas, Vimal Kumar Chandaliya, Pradip Kumar Banerjee
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Publication number: 20120171080Abstract: A system for the production of hydrogen from water in the presence of slag, comprising a graphite crucible containing molten slag; a reaction hood disposed over said crucible; a water line for spraying water on the molten slag in the crucible; and a steel tube for collecting and transferring the produced hydrogen gas from said hood into a condenser tank.Type: ApplicationFiled: March 9, 2012Publication date: July 5, 2012Applicant: TATA STEEL LIMITEDInventors: Debashish Bhattacharjee, T. Mukharjee, Vilas Tathavadkar
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Publication number: 20120024516Abstract: 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.Type: ApplicationFiled: April 20, 2009Publication date: February 2, 2012Applicant: TATA STEEL LIMITEDInventors: Jayabrata Bhadurt, Deb Roy, Subhrakanti Chakraborty, Shantanu Chakraborty, Sumitesh Das, Debashish Bhattacharjee
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Patent number: 8108064Abstract: A system for on-line property prediction for hot rolled coils in a hot strip mill of a steel plant, including a unit for capturing the chemistry from the steel making stage and providing the data on rolling schedule. Field devices are provided at the instrumentation level for measuring process parameters during hot rolling. A programmable logic controller is used for acquiring data of measured parameters from the field devices and feeding the data to a processor. Means is provided for conversion of the measured data from time domain to space domain using segment tracking. A computation module processes the converted space domain data for predicting mechanical properties along the length and through the thickness of the strip being rolled. A display unit displays the predicted properties. The data obtained can be stored in a data warehouse for future use. A unit provided in the system can collect the predicted properties and feed the same to the scheduling unit.Type: GrantFiled: March 26, 2004Date of Patent: January 31, 2012Assignee: Tata Steel LimitedInventor: Ananya Mukhopadhyay
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Publication number: 20110179702Abstract: 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.Type: ApplicationFiled: July 6, 2009Publication date: July 28, 2011Applicant: TATA STEEL LIMITEDInventors: Pinakpani Biswas, Vimal Kumar Chandaliya, Pradip Kumar Banerjee
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Publication number: 20110138687Abstract: 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.Type: ApplicationFiled: June 5, 2009Publication date: June 16, 2011Applicant: TATA STEEL LIMITEDInventors: P. S. Dash, P. K. Banerjee, D. Bhattachargee, T. Mukherjee, S. Ganguly
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Publication number: 20110091654Abstract: 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.Type: ApplicationFiled: May 23, 2008Publication date: April 21, 2011Applicant: Tata Steel LimitedInventors: A. K. Singh, Tapan Kumar Rout, Ramanuj Narayan, Anil Kumar Verma, N. Bandyopadhyay, Nitu Rani
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Publication number: 20110027133Abstract: 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.Type: ApplicationFiled: August 5, 2010Publication date: February 3, 2011Applicant: TATA STEEL LIMITEDInventors: Debashish Bhattacharjee, T. Mukharjee, Vilas Tathavadkar
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Publication number: 20100326895Abstract: 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.Type: ApplicationFiled: December 18, 2007Publication date: December 30, 2010Applicant: TATA STEEL LIMITEDInventors: Narasimha Mongadoddy, Pradip Kumar Banerjee, Debashish Bhattacharjee, T. Mukherjee, Peter Holtham, Matthew Brennan
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Publication number: 20100307054Abstract: 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.Type: ApplicationFiled: June 5, 2009Publication date: December 9, 2010Applicant: TATA STEEL LIMITEDInventors: Pinakpani Biswas, Vimal Kumar Chandaliya, Pradip Kumar Banerjee
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Publication number: 20100181520Abstract: An improved frothing agent adaptable to froth flotation process to enhance coal selectivity for separation and efficiency of the forth flotation process comprises:- A blended mixture of Ketone (2,6 Dimethl-4-Heptanone) 85-89% (Wr %) Ester molecule(Tetrahydrofurfuryl acetate) 10-12% (Wt %) Epoxide conditioner (1,2-Epoxydodecane) 0.25-0.30% (Wt %) Water 4.75-5.Type: ApplicationFiled: August 19, 2008Publication date: July 22, 2010Applicant: Tata Steel LimitedInventors: Ashiwani Kumar Gupta, Pradip Kumar Banerjee, Debashish Bhattacharjee