Title of Invention | ESTIMATION OF OIL CONTENT IN MILL SCALE AND MILL SLUDGE |
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Abstract | The present invention relates to a method for estimation of oil content in mill scale and mill sludge comprising the steps of mixing the mill scale and mill sludge with petroleum ether 60-80°C or in a pre weighed container (beaker of 100 ml capacity and subjecting the mixture to the step of heating at 60-85°C for 5 minutes by mantle heater (having auto cut means) and cooling the mixture and filtering the mixture to separate the filtrate and collect in a pre weighed beaker of 100 ml capacity (W1) and subjecting the filtrate to the step of evaporation at 70-80°C in a drying oven (11) and cooling and weighing the container again after evaporation (W2) characterized in that the difference of weight of container after evaporation and weight of empty beaker give direct percentage of oil present in a known weight of sample. |
Full Text | FIELD OF INVENTION: This invention relates to a method for estimation of oil content in mill scale and mill sludge. BACKGROUND OF THE INVENTION: Iron and steel making processes in any integrated steel plant generate large quantities of mill scale and mill sludge. Though these materials contain high iron contents, they are unfit for use due to the large amounts of oil content present in them as they could affect the sinter bed and ESP. Therefore controlling the oil content in these materials would enable them to have great potential for re use in sinter making process. Typical compositions of Mill scale and Mill Sludge are given below: After sufficient literature survey and pilot plant trials the specification of oil content in both these materials was fixed as 0.7% max. But for daily process control activity the determination of oil content in this was of utmost importance and accordingly a method for this necessary. There was no readily available procedure available for the same and therefore a rapid method has been developed for the same. OBJECTS OF THE INVENTION: An object of this invention is to propose a method for estimation of oil content in mill scale and mill sludge; Another object of this invention is to propose a method for estimation of oil content in mill scale and mill sludge which is simple; Further, object of this invention is to propose a method for estimation of oil content in mill scale and mill sludge which is rapid. DESCRIPTION OF THE INVENTION: According to this invention there is provided a method for estimation of oil content in mill scale and mill sludge comprising the steps of: a) mixing the mill scale and mill sludge with an organic solvent in a pre weighed container (W1); b) subjecting the mixture to the step of heating; c) cooling the mixture; d) filtering the mixture to separate the filtrate; e) subjecting the filtrate to the step of evaporation; f) weighing the container again after evaporation (W2); g) calculating the oil content by the formula: % Oil=W2-W1 / wt. of sample. One gram of sample mill scale and mill sludge is taken in a pre weighed beaker (W1) and mixed with an organic solvent. The entire mixture is warmed up to 60 deg C to 65 deg C for about five minutes. It is then allowed to cool. The entire contents are then filtered through whatman 40 filter paper. The filtrate is collected in the original pre weighed beaker (W1). The entire process is repeated once again to ensure that all the oil has dissolved in the solvent. The solvent is then evaporated in a drying oven at about 80 deg C and the beaker then cooled and reweighed (W2). The oil content is calculated by the formula given below: % Oil=W2-W1 / wt. of sample. Based on the fundamental knowledge of the miscibility of oils with organic solvents, trails were undertaken with a variety of solvents like petroleum ether, chloroform, isopropyl alcohol and acetone using a synthetically prepared standard sample. The standard sample has been prepared by mixing 200 gms to 210 gms of dry mill scale 1 gm to 1.05 gm of oil to give a theoretical value of 0.5% oil content. This mixture has been treated with each of the four solvents mentioned above using the method described above and the % age oil determined. The analysis was carried in triplicate. The above results indicate that using petroleum ether, the oil content obtained is closest to the theoretical value of 0.5%. Therefore Petroleum Ether has been selected as the solvent of choice for the method of determination of oil content in mill scale. EXAMPLE: Method of oil estimation in mill scale and mill sludge One gram of sample mill scale and mill sludge is taken in a beaker and mixed with an organic solvent. The entire mixture is warmed up to 60 deg C for five minutes. It is then allowed to cool. The entire contents are then filtered through whatman 40 filter paper. The filtrate is collected in another pre weighted beaker (W1). The entire process is repeated once again to ensure that all the oil has dissolved in the solvent. The solvent is then evaporated in a drying oven at about 80 deg C and the beaker then cooled and reweighed (W2). The oil content is calculated by the formula given below: % Oil=W2-W1 / wt. of sample. Based on the fundamental knowledge of the miscibility of oils with organic solvents, trails were undertaken with a variety of solvents like petroleum ether, chloroform, isopropyl alcohol and acetone using a synthetically prepared standard sample. The standard sample has been prepared by mixing 200 gms of dry mill scale with 1 gm oil to give a theoretical value of 0.5% oil content. This mixture has been treated with each of the four solvents mentioned above using the method described above and the % age oil determined. The analysis was carried in triplicate. WE CLAIM: 1. A method for estimation of oil content in mill scale and mill sludge comprising the steps of: a) mixing the mill scale and mill sludge with petroleum ether 60- 80°C or in a pre weighed container (beaker of 100 ml capacity); b) subjecting the mixture to the step of heating at 60-85°C for 5 minutes by mantle heater (having auto cut means); c) cooling the mixture; d) filtering the mixture to separate the filtrate and collect in a pre weighed beaker of 100 ml capacity (W1); e) subjecting the filtrate to the step of evaporation at 70-80°C in a drying oven (11); f) cooling and weighing the container again after evaporation (W2); characterized in that the difference of weight of container after evaporation and weight of empty beaker give direct percentage of oil present in a known weight of sample. The present invention relates to a method for estimation of oil content in mill scale and mill sludge comprising the steps of mixing the mill scale and mill sludge with petroleum ether 60-80°C or in a pre weighed container (beaker of 100 ml capacity and subjecting the mixture to the step of heating at 60-85°C for 5 minutes by mantle heater (having auto cut means) and cooling the mixture and filtering the mixture to separate the filtrate and collect in a pre weighed beaker of 100 ml capacity (W1) and subjecting the filtrate to the step of evaporation at 70-80°C in a drying oven (11) and cooling and weighing the container again after evaporation (W2) characterized in that the difference of weight of container after evaporation and weight of empty beaker give direct percentage of oil present in a known weight of sample. |
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00427-kol-2007 correspondence-1.1.pdf
0427-kol-2007-correspondence others.pdf
0427-kol-2007-description(complete).pdf
427-KOL-2007-CORRESPONDENCE.pdf
427-KOL-2007-DESCRIPTION (COMPLETE) 1.1.pdf
427-KOL-2007-EXAMINATION REPORT.pdf
427-KOL-2007-GRANTED-ABSTRACT.pdf
427-KOL-2007-GRANTED-CLAIMS.pdf
427-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
427-KOL-2007-GRANTED-FORM 1.pdf
427-KOL-2007-GRANTED-FORM 2.pdf
427-KOL-2007-GRANTED-SPECIFICATION.pdf
427-KOL-2007-PETITION UNDER RULE 137.pdf
427-KOL-2007-REPLY TO EXAMINATION REPORT.pdf
427-KOL-2007-REPLY TO EXAMINATION REPORT1.1.pdf
Patent Number | 250102 | |||||||||
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Indian Patent Application Number | 427/KOL/2007 | |||||||||
PG Journal Number | 49/2011 | |||||||||
Publication Date | 09-Dec-2011 | |||||||||
Grant Date | 07-Dec-2011 | |||||||||
Date of Filing | 20-Mar-2007 | |||||||||
Name of Patentee | TATA STEEL LIMITED | |||||||||
Applicant Address | RESEARCH AND DEVELOPMENT AND SCIENTIFIC SERVICES DIVISION, JAMSHEDPUR-831 001 | |||||||||
Inventors:
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PCT International Classification Number | B09B 3/00 | |||||||||
PCT International Application Number | N/A | |||||||||
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