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     · Oxidation pathway of high titania slag powder were investigated by non-isothermal TGA experiment. High titania slag powder (less than 0.075 mm) was heated from room temperature in air at 15 K·min −1. The sample had an approximate mass of 10 mg and was loaded into a platinum crucible.

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  • NEW PROCESS OF EXTRACTING VANADIUM FROM

     · between 750 850°C however the temperature of the molten vanadium slag fresh out of converter is about 1450°C.Water-soluble sodium vanadate formation reaction could be done quickly in the treatment of direct oxidation and sodium activating to this molten vanadium slag since its kinetic conditions are improved.

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  • Gold Smelting Refining Process

     · Other very interesting point is the degree of oxidation generated by the flux. If the oxygen liberated is high there will be produced a foaming effect during the smelting process. The contains water vapor metallic oxides fumes and combustion products and creates an appropriate environment to trap gold and silver into the slag.

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  • Effect of Slag Composition on the Oxidation Kinetics of

    Effect of Slag Composition on the Oxidation Kinetics of Alloying and outlet temperature of the mold cooling water were kept at about 3 000 A 38 V and 298 K (25°C) during ESR process respectively. In experi-mental A (with slag S1) B (with slag S2) and C (with slag S3) high purity argon gas was introduced into ESR equip-ment at a

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  • Stability of Chromium in Stainless Steel Slag during

     · Rapid cooling from high temperature by water granulation can form an amorphous structure of slag 22 which could encapsulate metals and thereby lower the solubility of heavy metals 17 . This was attributed to the formation of a stable silica network structure that can repel water and suppress chromium ion elution 23 .

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  • (PDF) Furnace cooling technology in pyrometallurgical

    The relatively high convection coefficients are due to the turbulent bath conditions present in TSL furnaces. The slag freezing temperature is chosen to be close to the liquidus temperature for

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  • v118n5a10 Effect of cooling conditions on the

     · cooling of stainless steelmaking slag. Considering the production of ferrochrome alloys from chromite ores Beukes Dawson and Zyl (2010) reported that the generation of Cr(VI) is related to the presence of oxygen at a high temperature. In this study to increase understanding of the mechanism involved in the leaching of chromium from

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  • HIGH TEMPERATURE VISCOMETERTA Instruments

     · 2 The VIS 413 High Temperature Viscometer 3 TA Instruments invites you to experience the latest innovations in high temperature rotational viscometers the VIS 413. The VIS 413 viscometer is designed for scientists who need to obtain melt viscosity data from the widest range of materials at the highest temperatures.

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  • Transfer Behavior of Fe Element in Nickel Slag during

    high-temperature furnace and heated to 1450°C at a rate of 5°C/min. The slags were melted and oxidized with air blowing into molten slag at flow rate of 200mL/min. After holding for 30min the oxidized slags were cooled to 1000°C at a cooling rate of 5°C/min and then cooled naturally down to room temperature in the furnace. Finally the

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  • Formation of Spinel Phases in Oxidized BOF Slag under

    Other available methods for controlling the f-CaO content in slag include water quenching (Reddy et al. 2006) slag oxidation and air cooling (Jiang et al. 2017) hot stuffy (Huang et al. 2016

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  • Gold Smelting Refining Process

     · Other very interesting point is the degree of oxidation generated by the flux. If the oxygen liberated is high there will be produced a foaming effect during the smelting process. The contains water vapor metallic oxides fumes and combustion products and creates an appropriate environment to trap gold and silver into the slag.

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  • Effects of High Temperature and Cooling Pattern on the

     · The large temperature difference between the cold water and the concrete with high temperature leads to more rapid development of cracks and pores in concrete. As a result the relative dynamic elastic modulus reduces correspondingly. 3.2. Effects of High Temperature and Cooling Pattern on the Chloride Permeability.

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  • Refractory lining of blast furnaceIspatGuru

     · Oxidation (water and oxygen) Deterioration Slag attack and erosion Wear Damage from scabs Loss of cooling elements and tuyeres Hearth Oxidation (water) Wear Zinc slag and alkali attack Deterioration High temperature Stress build up and cracking Erosion from hot liquids Break out risk Iron notch Heavy temperatures fluctuations

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  • PROBLEMS IN COAL BASED POWER PLANT FIRESIDE

     · High temperature corrosion problems in coalloil based main corrosion problems in power plants are the waterlsteam side corrosion of the inner wall tubes of the boiler and the oxidation/sulphidation and hot corrosion of outer walls of hoiler tubes. The former is well cooling water. Each fluid loop possesses its unique corrosion problems.

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  • Study on the Temperature and Thermal Stress of the Slag

     · The temperature and thermal stress of the slag layer were simulated and the contribution of the phase change of slag during the cooling process was also investigated. The simulation results indicate that remarkable temperature gradients are observed in the slag layer and the temperature field is also influenced by the stud.

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  • Factors affecting the leachability of Ni/Co/Cu slags at

    The current work extends this finding to the case of high temperature dissolution of amorphous FeO-SiO2 slags by providing evidence for the formation of a passive silica layer within slag

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  • Extending the life of water-cooled copper cooling fingers

    However the cooling devices may lose their efficiency over time. It is believed that high-temperature oxidation of copper is responsible for the loss in heat-extraction capacity. To test coolers under severe conditions immersion tests were carried out in molten matte and slag of laboratory-scale cooling elements protected by various means.

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  • Furnace Off-gas DuctIntegrated Global

     · The off-gas temperature of the furnace runs up to 1 200 °C. The off gas is cooled by an evaporative cooling tower to around 270 °C. The off-gas ducting is water cooled up to the evaporative cooling tower where the cooling tower is lined because of corrosion. Due to over spray caused by lances injecting an air-water

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  • 7th International Symposium on High‐Temperature

     · The technology operation energy environmental analysis and future development of the metallurgical industries utilizing high temperature processes are covered in the book. The innovations on the extraction and production of ferrous and nonferrous metals alloys and refractory and ceramic materials the heating approaches and energy

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  • Water HandbookCooling Water Corrosion Control SUEZ

    2 days ago · Chapter 24 - Corrosion Control-Cooling Systems. SUEZ is a leader in developing and delivering effective cooling water corrosion control chemistries . Corrosion can be defined as the destruction of a metal by chemical or electrochemical reaction with its environment. In cooling systems corrosion causes two basic problems.

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  • Aluminum melting slag formationaluminium-guide

    Reactivity of aluminum slag. The efficiency of slag cooling depends on the degree of slag reactivity. for instance slags of aluminum alloys with a high magnesium content are characterized by increased reactivity. Another factor is the amount and chemical composition of the fluxes. which are contained in the slag. Without the use of cooling

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  • Why aluminum die casting defects will oxidize and slag

     · Methods to prevent oxidation and slag inclusion 1. Re-pouring molten metal from the riser to improve the design of the riser. 2. The charge should be clean and non-corrosive. 3. A riser is set at the shrinkage porosity of the casting and the cold iron or cold iron is placed in combination with the riser. 4.

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  • Oxidation of High-Titanium Slags in the Presence of Water

    High-titanium slag can be oxidised by exposure to oxygen or water vapour since the slag contains trivalent titanium and divalent iron such oxidation is used in slag upgrading processes.

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  • Oxide Spallation During Post-isothermal High Temperature

    Young D. High Temperature Oxidation and Corrosion of Metals. Amsterdam Elsevier Corrosion Series 2008. 5 Berthod P Aranda L Mathieu S Vilasi M. Influence of water vapour on the rate of oxidation of a Ni-25wt. Cr alloy at high temperature. Oxidation of Metals 2013 79 517-27.

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  • THE LINK BETWEEN SOLIDIFICATION OF HIGH- TITANIA

     · and this is done by adequately cooling the slag ingots. Decrepitation occurs at 400°C 2 and hence the surfaces of the ingots need to be cooledby water sprayingto well below this temperature to suppress oxidation. If cooling took place at low Biot numbers the convective heat transfer coefficient

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  • Furnace Off-gas DuctIntegrated Global

     · The off-gas temperature of the furnace runs up to 1 200 °C. The off gas is cooled by an evaporative cooling tower to around 270 °C. The off-gas ducting is water cooled up to the evaporative cooling tower where the cooling tower is lined because of corrosion. Due to over spray caused by lances injecting an air-water

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  • Hydrogen generation characteristics of steel slag-steam

     · As depicted in Fig. 1 the present authors have developed an integrated steam modification process towards utilizing steel slag wastes to achieve hydrogen production iron recovery heat recovery and volumetric stabilization simultaneously .The incorporation of steam oxidation (Eq. ) and hydration (Eq.) reactions along the hot to cold cooling path of molten slag enables the hydrogen

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  • Water HandbookCooling Water Corrosion Control SUEZ

    2 days ago · Chapter 24Corrosion Control-Cooling Systems. SUEZ is a leader in developing and delivering effective cooling water corrosion control chemistries . Corrosion can be defined as the destruction of a metal by chemical or electrochemical reaction with its environment. In cooling systems corrosion causes two basic problems.

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  • Acidolysis Performance of Titania Slag Treated at

     · Bessinger 22 and Kotze 23 investigated granulation and air cooling of Titania slag respectively. During cooling high Titania slag containing 85 wt TiO 2 can decrepitate to a fine particulate material. Their results show that the disappearance of M 3 O 5 phase was linked to oxidation of the slag.

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  • Influence of burning temperature and cooling methods on

     · High carbon ferrochrome slags and clay were used to prepare lightweight aggregate (LWA). When burning temperature rose to 1200 °C the aggregate could get a well expansion.After sintering different cooling methods were applied and the resulting specimens were investigated with respect to particle strength related to pore structure and phase composition.

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  • Investigation of Zinc Fuming Processes for the Treatment

     · In high-iron-containing slags oxidation/reduction reactions can occur through redox reactions mass transfer of zinc and lead species in the is the temperature of the cooling water k slag and k wall are the conductivities of slag and side wall t wall is the thickness of the side wall. h pc1

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  • Effects of High Temperature and Cooling Pattern on the

     · The large temperature difference between the cold water and the concrete with high temperature leads to more rapid development of cracks and pores in concrete. As a result the relative dynamic elastic modulus reduces correspondingly. 3.2. Effects of High Temperature and Cooling Pattern on the Chloride Permeability.

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  • Frontiers Hydrothermal Steel Slag Valorization—Part II

     · Results Steel Slag Oxidation in Water Effect of Temperature. Three experiments were first conducted with steelmaking slag and de-ionized water in a sampling autoclave at 250 300 and 350°C (Figure 1A APW-250C APW-300C APW-350C in Table 3).Whatever the investigated temperature about half of the H 2 is produced during the first 24 h. After 24 h and up to the end of the experiment

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  • v118n5a10 Effect of cooling conditions on the leachability

     · cooling of stainless steelmaking slag. Considering the production of ferrochrome alloys from chromite ores Beukes Dawson and Zyl (2010) reported that the generation of Cr(VI) is related to the presence of oxygen at a high temperature. In this study to increase understanding of the mechanism involved in the leaching of chromium from

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  • Thermal Plasma Solid Waste and Water Treatments A

     · categorized as Table 1 based on the gas temperature and operating gas pressure. For the solid waste treatment due to the melting and evaporation requirements high gas temperature high gas pressure plasma is used. For water treatments depending on the target pollutants low temperature and high gas pressure plasma is used.

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  • High temperature oxidation of HSLA steel under vapor

     · • The outer surface temperature should be higher than 850 °C to avoid a volumetric expansion accompanying the transformation of austenite structure to ferrite 7 . Mist spray cooling i.e. mixture of air water provides a uniform cooling. A high pressure of the mixture is sprayed on the metal surfaces. Some advantages are

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  • Stability of Chromium in Stainless Steel Slag during

     · Rapid cooling from high temperature by water granulation can form an amorphous structure of slag 22 which could encapsulate metals and thereby lower the solubility of heavy metals 17 . This was attributed to the formation of a stable silica network structure that can repel water and suppress chromium ion elution 23 .

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  • ABSTRACT It FeSi.

     · high temperature ( °C) and a sub­ sequent rapid cooling. We also need to inject a jet of water when the melt has reached desired temperature in order to oxidize the melt surface. A schematic cross -section of the apparatus is shown in figure 1. A graphite susceptor with the shape of an open cylinder is lo­

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  • HIGH TEMPERATURE VISCOMETERTA Instruments

     · 2 The VIS 413 High Temperature Viscometer 3 TA Instruments invites you to experience the latest innovations in high temperature rotational viscometers the VIS 413. The VIS 413 viscometer is designed for scientists who need to obtain melt viscosity data from the widest range of materials at the highest temperatures.

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  • HIGH-TEMPERATURE CHARACTERISTICS OF STAINLESS

    high-temperature service strength at temperature is related to time at temperature. Allowable Deformation Another factor to consider in designing for high-temperature service is the amount of deformation that can be permitted during the total service life. This factor determines which of two high-temperature strength properties

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  • RESEARCH OVERVIEW ON RECOVERY OF WASTE HEAT

     · slag particles flowing around a circular tube was simulated numerically. The effects of particle inlet velocity cooling water inlet velocity and cooling water inlet temperature on heat transfer were studied. The simulation results showed that the heat transfer coefficient increased with the increase of slag

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  • Novel concept of steam modification towards energy and

     · Steel slag tapped from converter at high temperature of 1450–1650 °C has significant amount of waste heat (Zhang et al. 2013). The heat from hot slag particles enables triggering the slag-steam reactions at high temperature. Herein we proposed a novel concept of steam modification process along the cooling path of molten steel slag.

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