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 …

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However, in hot-rolling mills, water used for descaling and cooling steel (process water) and water used for cooling rolls and bearings (cooling water) were reported together. Inasmuch as the steel indus­ try generally considers all water used in rolling mills as cooling water, it is reported as such in this report.

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The scale needed to be removed with the mill running in order to use the existing water in the pit to assist in removal and save costs Using vacuum and high pressure water trucks would take approximately 6 to 7 days Cost Saving Services With time constraints and the requirement that the mill remain online Dynamic deployed specialized high volume high pressure NLB pumps …

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A method for collecting mill scale from a hot rolling mill is provided. The hot rolling mill includes a flume. The method includes transporting mill scale particles in wastewater, retrieving the wastewater from a flume of the hot rolling mill and separating the mill scale particles from the wastewater using a separator. A hot rolling mill and a method for retrofitting a hot rolling mill …

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The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

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scale pit from steel mill - cestiris.nl. pit scale pit in steel rolling mill. However, the mill scale is now oilwet as a result of contact with the oil in the flume water trench and scale pit In some cases, mill scale may contain up to 10% oil Steel mills consider the recycling of mill scale highly desirable, since mill scale provides higher iron content than iron ore However, there ...

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High-pressure piping will be made of pipe steel, in order to connect pipe flow to the valves for descaling and complete with heavy-duty PP clamps, fittings, hoses, etc. Descaling speed on the liner = 1.5–4 m/sec. Water descaling unit operates according to the required rolling speed/ mill capacity. MODEL 2.

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During hot rolling of special grades of steel like Nickel (Ni) and 416 Stainless Steel containing high sulphur content, mill scale is greatly increased. Surface finish of hot rolled product may be compromised due to scale pits and rolled-in scale. Occasionally, due to heavy adherent scale, problem of roll skid is also encountered.

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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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Scale recovery and water cleaning in rolling mills The large amounts of cooling water used in a rolling mill means good water recovery is crucial for operating economy. Alfa Laval decanter centrifuges efficiently remove scale and ferrous particles from cooling water. This ensures wear on the machinery is minimal and that as much

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The water management systems benefit from more than 100 years of experience in metallurgical plant and rolling mill engineering. This know-how ensures the optimized and reliable integration of water treatment plants into a production process that saves energy and water.

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This mill scale can reduce corrosion if steel is exposed to air over short periods, however, the corrosion increases if exposed for long periods. Large amounts of mill scale also cause severe pitting corrosion if the surface is in contact with water.

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Gallatin Steel is a mini-mill that produces steel coils through the . Compact Strip Process (CSP). The Direct Contact Water (DCW) system provides cooling water for both the caster and rolling mill in a single combined system. Return water, after contact with the pro-cess, drains through flumes to the 1.1 million gallon DCW scale pit, where ...

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rolling-mill train is 90 Tonnes/hour, and we estimate a formation of scale equal to 0.2% of the. production total, the maximum amount of scale that the contact water will …

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Consumption of water by integrated steel plants ranged from 0 to 2,010 gallons per ton of ingot steel and by steel processing plants from 120 to 3,420 gallons per ton. Consumption by a typical integrated steel plant was 681 gallons per ton of ingot steel, about 1.8 percent of the intake and about 1 percent of the gross water use.

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The descaling water and the cooling water wash the mill scale away from the steel surfaces, flow with the mill scale into the flumes underneath the rolling lines, run at a high speed in the flumes and eventually are discharged into the deep and wide mill scale pits. The wastewater in the mill scale pits becomes fairly calm.

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The 3,205 m³/hr contact water circuit is for the continuous caster and rolling starts at the scale pit, which removes particles that have a size equal to or greater than 200 microns. The density difference between the water and the scale, makes …

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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.

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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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Hofors, a small town 2.5 hours north of Stockholm, was the scene of the first-ever full-scale test of heating steel using hydrogen as a fuel and oxygen as an oxidant before rolling. Carried out as part of a collaboration between Ovako and Linde, the test took place in one of Ovako's pit furnaces at the Hofors rolling mill.

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The water-treatment plant serving the 380,000-tpy minimill for straight and spooled bars –meltshop and rolling mill featuring endless casting rolling– was designed in compliance with all applicable local standards (ASME, UL, NEMA, OSHA) …

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Four Stage Process Water from the rolling mill is treated first in the scale pit, followed by the decanting process to remove coarse particles that have a size greater to or equal to 200 microns.

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In hot strip rolling mills, high pressure water jets are used to remove scale from the steel bars just before they enter the rolling mill. The descaler pump runs at a constant speed, and the high pressure water is bypassed to the water pit when no bar is present. Running the pump at a constant speed wastes energy and water and heavy

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A twin-stand Steckel Mill combines Steckel technology and tandem rolling. This mill type gives you the capacity to produce high-quality hot strip on a Steckel mill at production rates of 1 - 1.2 million t per year (without roughing stand) or up to 1.8 million tons per year with roughing mill.

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While this particular steel plant has huge outdoor scale pits, which pump over 44,000 gallons of scale-saturated wastewater, this specific in-plant scale pit was collecting wastewater with the highest concentration of scale and pumping it to a piping system which delivered it to a flume.

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The hot-rolled sheet steel is normally cleaned or pickled in a bath of sulphuric or hydrochloric acid to remove surface oxide (scale) formed during hot rolling. A modern pickler operates continuously. When one coil of steel is almost cleaned, its end is sheared square and welded to the start of a new coil. In the pickler, a temper mill helps ...

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Mill scale Wikipedia. Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. Mill scale is bluish-black in color. It is usually less than 0.1 mm (0.0039 in) thick, and initially adheres to the steel surface and protects it from atmospheric ...

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In steel production process of hot rolling and casting large amounts of water are used depending on the scale of the operation. As steel leaves the casting operations, cooling and cutting with water produces mill scale (iron oxides). This hot water from the mills is transported to Scale pit for the first stage of clarification.

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Steel Mill Scale Water Pit orosertegyesuleteu. The customer uses its Rotomiteto remove iron mill scale to maintain capacity in its cooling job of removing hydraulic oil from our Rolling Mill Scale Pits . Get Price. Amazon seed remover.

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Zero-scale pits reduce 900 cubic meters of civil construction related-costs, avoiding the usual large and deep underground pits for settling mill scale. Installing just three DanFilter™ units ensures high-quality water circulation. Containerized electrical cabins and package cooling towers are preassembled before delivery, ready to connect.

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