A study of slag-infiltrated magnesia-chromite refractories
Regarding magnesia–chromite refractory the corrosion mechanism consisted of severe slag infiltration high temperature inactivation of the secondary chromite and primary chromite dissolution in
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The effect of phase formation during use on the chemical
The effect of phase formation during use on the chemical corrosion of magnesia-chromite refractories in contact with a non-ferrous PbO-SiO2 based slag Author Scheunis L. Author Fallah Mehrjardi A.
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INNOVATIVE MAGNESIA-CHROME FUSED GRAIN
determine the corrosion resistance of the newly-developed magnesia-chromite brick to fayalite-type process slag. A typical chemical analysis of a slag used for the test is shown in Table I. The results were compared with the standard magnesia-chromite and alumina-chrome brands.
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Hot Corrosion Behavior of MagnesiteChromite
Chemical degradation of magnesia-chromite refractory used in the conversion step of the pyrometallurgical copper-making process A thermochemical approach I. Pérez I. Moreno-Ventas G. Ríos Materials Science
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Corrosion mechanism and kinetic behaviour of refractory
CORROSION MECHANISM KINETIC BEHAVIOUR OF REFRACTORY MATERIALS 343 corrosion mechanisms. As a result of different MgO and graphite wettability by the slag and metal phase the metal creeping up and formation of slag film is a cyclic process that results in the progress of the local corrosion of MgO-C refractory.
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Postmortem Study of a Magnesia-Chromite Brick from a Lead
The magnesia-chromite brick suffered from a high chemical attack due to the process slag. The high CaO BaO and sulfur-bearing silicate slag as well as a high Na2O supply from soda resulted not only in a deep-reaching infiltration of the brick microstructure but also in a severe corrosion
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CORROSION OF BASIC REFRACTORIES IN COPPER
the magnesia magnesia-chromite and magnesia-carbon refractories was studied by crucible corrosion tests. Penetration of the melts into body of the refractories was observed. Results were evaluated by macroscopic micrographic and chemical analyses 19 .
Get PriceCorrosion mechanism of magnesia-chromite refractories by
Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form
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(PDF) Chemical corrosion of magnesia-chromite refractory
The chemical corrosion of magnesia-chromite refractory is studied using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) coupled with wavelength-dispersive spectroscopy (WDS). EXPERIMENTSThe composition of the ZnO-containing fayalite slag is listed in Table 1.
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ChromiteWikipedia
Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel group.The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr 2 O 4). A substitution of the element aluminium can
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Refractory Materials for Metallurgical Uses SpringerLink
Aug 21 2018 · The following three articles of this series are dedicated to refractory wear in the copper industry. The article "Copper Anode Furnace Chemical Mineralogical and Thermo-Chemical Considerations of Refractory Wear Mechanisms" by Dean Gregurek et al. describes the mechanisms associated with the wear of magnesia–chromite and alumina–chromia bricks.
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Magnesite Refractories
The main advantages of using Magnesia Spinel bricks are Very high excellent refractoriness. Low thermal expansion coefficient. High resistance to thermo-mechanical stress. High resistant to corrosion and changes in kiln atmosphere. Low content of secondary oxides. Elimination of chromite.
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Hot Corrosion Behavior of MagnesiteChromite
Chemical degradation of magnesia-chromite refractory used in the conversion step of the pyrometallurgical copper-making process A thermochemical approach I. Pérez I. Moreno-Ventas G. Ríos Materials Science
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CORROSION RESISTANCE OF THE AUSTENITIC CHROMIUM
Corrosion Resistance of the Austenitic Chromium-Nickel Stainless Steels in Chemical Environments INTERPRETING CORROSION TEST DATA The quantitative data secured in corrosion tests are often of a very low order of magnitude. When the cor- rosion rate is of the order of less than 0.1 mils penetra-
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Chemical Degradation Mechanisms of Magnesia–Chromite
Aug 15 2018 · Magnesia–chromite refractory has been extensively used in the copper-making industry. It is necessary to understand the degradation mechanisms of the current refractory to develop new refractories. In the present study post mortem refractories from a smelting furnace were analyzed and compared with the results of static corrosion tests on magnesia–chromite refractories in the
Get PriceChemical wear mechanism of magnesia-chromite refractory
Jan 15 2021 · Among them chemical corrosion resulted from the infiltration of molten slag as well as overheated matte and copper metal is the main degradation mechanism usually giving rise to high wear and thermo-chemical spalling which to a great extent determines the
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Leachability of chrome from magnesia-chromite refractory
The interactions of magnesia-chromite refractory brick with Cu-Na2O·2SiO2 and CuO-Na2O·2SiO2 melts are studied and the chemical durability of corrosion products in water is evaluated. The corrosion
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Corrosion mechanism of magnesia-chromite refractories by
An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt to 40wt was tested.
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Postmortem Study of a Magnesia-Chromite Brick from a Lead
The magnesia-chromite brick suffered from a high chemical attack due to the process slag. The high CaO BaO and sulfur-bearing silicate slag as well as a high Na 2 O supply from soda resulted not only in a deep-reaching infiltration of the brick microstructure but also in a severe corrosion
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A study of slag-infiltrated magnesia-chromite refractories
Regarding magnesia–chromite refractory the corrosion mechanism consisted of severe slag infiltration high temperature inactivation of the secondary chromite and primary chromite dissolution in
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Corrosion Inhibitors Principles Mechanisms and Applications
Recent studies estimate that the U.S. demand for corrosion inhibitors will rise 4.1 per year to USD 2.5 billion in 2017. In 2012 they estimated that the market demand of inhibitors was divided on 26.6 to refining petroleum 16.9 utilities 16.7 gas and oil production 15.3 chemical 9.5 metals 7.1 pulp and paper and 8.0 other. 5
Get PriceRefractory Materials for Metallurgical Uses SpringerLink
Aug 21 2018 · The following three articles of this series are dedicated to refractory wear in the copper industry. The article "Copper Anode Furnace Chemical Mineralogical and Thermo-Chemical Considerations of Refractory Wear Mechanisms" by Dean Gregurek et al. describes the mechanisms associated with the wear of magnesia–chromite and alumina–chromia bricks.
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Journal of Alloys and Compounds
Corrosion mechanisms of magnesia-chrome refractories in copper slag and concurrent formation of hexavalent chromium Tengteng Xu a b Yibiao Xu a b Yawei Li a b Shaobai Sang a b Qinghu Wang a b Tianbin Zhu a b Mithun Nath a b Bo Zhang a b a The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology 430081 Wuhan PR China
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Corrosion mechanism of magnesia-chromite refractories by
An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt to 40wt was tested.
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(PDF) Chemical corrosion of magnesia-chromite refractory
The chemical corrosion of magnesia-chromite refractory is studied using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) coupled with wavelength-dispersive spectroscopy (WDS). EXPERIMENTSThe composition of the ZnO-containing fayalite slag is
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Corrosion and Surface Treatment of Magnesium Alloys
Feb 04 2014 · With the PEO coating thicknesses of 6.3 and 18.6 microns the corrosion current density was decreased by 1.330 10-3 and 1.341 10-3 mA/cm 2 from the uncoated magnesium respectively indicating a significant reduction in the degradation rate between pure magnesium and coated magnesium from 6.17 10-1 to 1.91 10-2 and 1.42 10-2 g/year
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Mechanism of Dihydrogen Formation in the Magnesium−Water
The thermodynamically favored reaction between water and magnesium Mg 2H2O → Mg(OH)2 H2 is normally sluggish but it becomes reasonably rapid when a milled composite of powdered magnesium metal and powdered iron (1−10 mol ) is used with sodium chloride solutions. Iron functions as an activator and chloride functions as a catalyst that depassivates the outermost oxide/hydroxide
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Magnesium chromateWikipedia
Magnesium chromate hydrate should be stored at room temperature and there is no current therapeutic use. It is a confirmed carcinogen and can cause acute and dermititis and possibly kidney and liver damage if inhaled so it should be treated as a hazardous waste .
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Chemical Degradation Mechanisms of Magnesia–Chromite
Chemical Degradation Mechanisms of Magnesia–Chromite Refractories in the Copper Smelting Furnace . By Mao Chen Yang Jiang Zhixiang Cui Chuandong Wei and Baojun Zhao. Cite . BibTex Full citation Publisher Springer Nature. Year 2018. DOI identifier 10.1007/s
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