Feb 22, 2017 · 4 min read. Mill scale is a flaky surface that forms on the exteriors of steel sheets and plates during their manufacture via rolling billets and hot iron. The by-product is ...
The high pressure water jets are used to remove scale from the steel bars before they enter the rolling mill. Normally high pressure water is bypassed to the water pit when no bar is present, wasting energy. If the roughing mill is reversing, there are descale nozzles on either side, using even more energy.
This process gives steel a higher strength-to-weight ratio than can be made on a hot mill. A modern five-stand tandem cold mill may receive a sheet about 1/10 inch (0.25 cm) thick and 3/4 of a mile (1.2 km) long; 2 minutes later that sheet will have been rolled to 0.03 inch (75 mm) thick and be more than 2 miles (3.2 km) long.
Mill scale is coarse, heavy and abrasive In steel production, hot milling and casting uses water at rates of between 100 cubic meters per hour and 10,000 cubic meters per hour, depending on the scale of the operation. As steel leaves the casting operations, cooling and cutting with water produces mill scale (iron oxides).
Scale cargo containing mainly ferric oxide that is collected from various places of iron-and-steel making process. Mill scale - a scale cargo collected from water used in hot rolling process and drainage pits, with small amount of oil ( used for …
In addition, water is used as flume flushing to transport the scale to the scale pits for removal. The rolling mill water system typically incorporates scale pits, oil skimmers, straining devices, solids removal with clarifiers and/or deep bed filtration equipment (when low suspended solids levels are to be maintained), and cooling towers.
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In steel production, hot milling and casting uses water at rates of between 100m3/h and 10000m3h depending on the scale of the operation. As steel leaves the casting operations, cooling and cutting with water produces mill scale (iron oxides). Mill scale particles range from a few microns up to the size of a fist. They are heavy and abrasive.
Introduction. Mill scale is a waste iron by-product formed during the steelmaking process and particularly during the processes in the steel plant which occur after the blast furnace which processes permit steel ingots to be formed into various sheet, tube, and other products.
In a steelmaking method, the improvement comprising contacting oil-coated mill scale with hot slag derived from the steel-making process whereby the oil is ignited and flashed away and the scale commingled with the slag for subsequent processing, recovery of metallic values, and recycle to the steelmaking operation.
The steel mill engaged an engineering firm to design a new type of scale pit at their facility. The engineering firm was also a long-term customer and fan of Oil Skimmers, Inc., having specified their equipment in other process water, wastewater and stormwater applications.
As steel leaves the casting operations, cooling and cutting with water produces mill scale (iron oxides). Mill scale particles range from a few microns up to the size of a fist and are also heavy and abrasive with a density of 4.9 to 5.2 grams per cm 3. Traditionally, this coarse material is collected in pits to be emptied by cranes or chain ...
scale drops into a flume and is carried by a stream of water to a scale pit. The volume of water used in this opera tion varies with the stock being rolled, but it will usually fall in the range of 2,000 to 4,000 gpm. Mill scale may contain upward of 70 per cent iron as a mixed oxide and is equivalent to very high grade iron ore.
Mill scale 36,000 metric tons per year 36,000 metric tons per year (no change in steel production) Mill scale (primarily iron oxide) is produced by descaling hot metal strips using water jets. The wet scale is collected in the scale pit, dewatered and disposed of by landfilling or by reincorporating it back into the iron-making process.
A process for de-oiling mill scale which comprises (a) collecting mill scale and analyzing for oil content; and then (b) slurrying the portion of mill scale containing more than 0.5 weight percent oil in water to achieve an aqueous mill scale slurry having at least 25 weight percent solids content; and then (c) high shear agitating the aqueous mill scale slurry to form a reduced oil …
Up to 300 cubic meters of water are pumped each minute throughout the HSM to cool finish-rolled strip, furnace skids, mill rolls, and coiler components, and to descale transfer bars. All water is recycled through a system of scale/sludge collection pits, through the laminar cooling system, and back to one of the two dedicated cooling towers ...
In the hot-rolling process, owing to oxidation reactions, mill scale is formed on the surfaces of semi-steel products in reheat furnaces and on rolling trains and stands [1,2,3].The mill scale is washed away from steel surfaces and flushed into flumes underneath the hot-rolling lines by a large amount of contact water, which includes descaling water and cooling water.
The invention comprises a method of preventing deposition of oil on steel mill scale particles comprising adding from about 1 part per million to about 500 parts per million of an amine acrylate/acrylic acid copolymer to mill flume water. Once the copolymer is added, deposition of oil onto scale particles is prevented. The recovered mill scale has less than 2% oil by weight on …
Industrial Wastewater Skimmers for Steel Mills Removing Grease from Steel Manufacturing Wastewater: Oil Skimmer is Lowest-Cost Method. Abanaki offers industrial wastewater skimmers specially designed for steel mills where plant maintenance engineers are looking for the lowest cost, most reliable method of removing greases and heavy oils from the steel-mill …
This vapour spreads through the air and can harm the environment in many ways. When this vapour ends up in the water, it is also lethal to fish and other aquatic animals. 3. Mechanical removal. Fortunately, the chemical method is not the only option for removing the mill scale from steel. The mill scale can also be removed by blasting or grinding.
A rolling mill sludge containing a grease deposit and having a high moisture (water) content is deposited in a waste water pit of a steel rolling mill. BACKGROUND OF THE INVENTION A scale or a cutting scrap in a small quantity is conventionally mixed with iron ore fines to serve as a sinter raw material.
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Nordic steel mill solution reduces water treatment costs
The scale pit is used to remove the larger scale and particulate, as well as to skim the oil from the water and is normally sized for 30–45 minutes of retention time. In some mills, this pit also receives wastewater from the hot roll and other miscellaneous processes throughout the mill.
For the purpose of utilizing as a sinter raw material a rolling mill sludge with a grease deposit having a high moisture content, which is deposited in a waste water pit of a steel rolling mill, the moisture content of said rolling mill sludge is reduced to from about 1% to 10% by drying said rolling mill sludge at a temperature of from about 120° C to about 200° C, preferably of about …
In a rolling mill where the steel will be stretched and squished the mill scale will first be removed mostly by water jets, or by sand blasting in some shops or by vibrating rolls in others and the mill scale will fall into a pit below the equipment where it will also be joined by rolling mill lubricants and bearing oils and water.
MILL WATER DISTRIBUTION AND BLOWDOWN, ARMCO STEEL CORPORATION Production Area Coke plant Blast furnace Open hearth shop Basic oxygen shop Vacuum degas ser Continuous caster Soaking pits and slab furnaces Hot rolling mill Picklers 3, Cold rolling mill Annealing furnaces Coating line Total * Make-up, 1/min 3,800 3,800 4,200 1,100 12,500 …
A steel producing partner of ours in the northeast U.S. was having major operational problems in their mill scale pits because the pumps that they had installed were nothing more than glorified water pumps pretending to be slurry pumps.
adhering residues of mill scale, rust and coatings. Traces of residue are permitted on 10% of each unit area if they are evenly distributed. SP7 Brush Off Blast: Blasting to remove marginally adhering residues of mill scale, rust and coatings and provide a properly prepared surface condition for application of subsequent coatings. Chat Now
Joined Jul 5, 2016. Black could refer to mill scale or a pickled steel, neither of which you would want on your food. If it is just mill scale you could grind, sand then season like a cast iron. However I'm not sure if it would be considered food safe. If it is a pickled steel I would not use it, if there are any micro cracks in the steel it ...
