Fundamental Study of Phosphate Bonding in Refractories I
Hui‐xian Wei Yan‐wei Jiang Qiang Zhang Cheng‐hao Mo Dong‐yin Liu Effect of boric acid on properties of high‐alumina phosphate‐bonded plastic refractory materials Journal of the Chinese Chemical Society 10.1002/jccs. 65 9 () (2018).
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Refractory Alternatives to Combat Elephant s Foot Erosion
Alumina Based Dry Vibratables Material Selection Material can be based on chamotte bauxite mullite or andalusite Advantages High strength for impact resistance Good sintering properties Disadvantage Seam will separate between materials Area between top cap (alumina) and working lining (quartz) is low temperature eutectic
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The ramming refractories usually have low to high alumina can be air or heat or set and are phosphate bound. The products are usually available in a semi dry condition with moisture content up to 3 and can be hand rammed as well.
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USB1Method of manufacture of phosphate-bonded
A phosphate-bonded refractory composition consists of a size-graded mixture of refractory material 3 to 5 weight percent based on the total weight of the batch of finely divided aluminium hydroxide 4.22 to 8.37 percent by weight of the total weight of the batch of 75 to 85 percent phosphoric acid the ratio of the aluminum in the aluminum hydroxide to phosphorus in phosphoric acid being
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Solid-State Chemistry of Alumina-Chrome Refractories
Fusion-case alumina-chrome refractories are used /38/ in fiberglass production also in glass production furnaces in locations where resistance to corrosion by the glass-melt is important and any coloration resulting from the chrome is acceptable. 4.2 Properties and Uses of Alumina-Chrome Refractories In previous work /4 39 40/ on alumina
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Sciencemadness Discussion Boardcastable refractory
Nov 07 2017 · If you want a mix to embed the heating elements alundum cement works well. AFAIK it s just alumina with 1-3 phosphoric acid binder. You could use a clay binder if you don t like phosphoric acid but after firing the acid will be bound up as aluminum phosphate.
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THE ROLE OF HIGH ALUMINA CEMENT IN SPINEL ORMING
to the quick and controlled setting and the high alumina content S80 can also be used in ladle castables. Due to these specific properties formwork can be pulled soon after casting and therefore the drying and heating step can be advanced. S80 works not only as a binder. It has also a micro-pore filling effect due the fineness of this cement
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USAPlastic refractory compositions having
Improved gunnable plastic refractory compositions consist of a mass of friable clusters of granular material which has a moisture content of from about 4 to about 10 by weight of the total composition and contains from about 0.05 to about 0.5 by weight (added) preferably 0.1 to 0.3 of a hydrocolloid selected from the class consisting of a polysaccharide ether and xanthan gum and from
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Aluminum resistant refractory compositionVFR Inc.
A refractory composition as recited in claim 1 wherein said additive consists essentially of a blend of boric acid calcined alumina and fluorspor in relative amounts sufficient to provide a boron oxide content of from 10 to 50 percent by weight a aluminum oxide content of from 10 to 50 percent by weight and a calcium fluoride content of
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Gunnable refractory compositionNational Refractories
For example U.S. Pat. No. 3 879 208 discloses a refractory composition suitable for forming a monolithic structure by ramming gunning or casting containing (as bond) aluminum sulfate and an organic acid or salt thereof with or without the addition of a boron compound (the bond disclosed and claimed in that patent being sometimes hereafter
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US Patent for Refractory mix composition and method of
The invention relates to an alumina based phosphate bondable dry refractory mix composition exhibiting an extended shelf life of up to eighteen months and longer. The mixture has the following preferred composition on a weight percentage basis 40-70 sized tabular alumina 15-35 calcined alumina 2-10 hydrated alumina 1-10 calcium aluminate cement and an acid ingredient such as
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Jul 30 2019 · The materials used in this work were raw materials with commercial purity although raw materials of high purity were used when necessary to help in the analysis of phase formation. The main materials used were magnesium oxide (MgO) ammonium dihydrogen phosphate (ADP) and boric acid (setting time retarder). 2.1.1. Magnesium oxide
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Boron nitrideWikipedia
Boron nitride is a thermally and chemically resistant refractory compound of boron and nitrogen with the chemical formula BN.It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice. The hexagonal form corresponding to graphite is the most stable and soft among BN polymorphs and is therefore used as a lubricant and an additive to cosmetic products.
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Effect of boric acid content on the properties of
Jul 30 2019 · The materials used in this work were raw materials with commercial purity although raw materials of high purity were used when necessary to help in the analysis of phase formation. The main materials used were magnesium oxide (MgO) ammonium dihydrogen phosphate (ADP) and boric acid (setting time retarder). 2.1.1. Magnesium oxide
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Tailoring the microstructure and thermo-mechanical
Jan 31 2020 · The first part of this project was focused on evaluating high-alumina refractory castables bonded with SioxX-Zero and/or microsilica and containing 0 or 1
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Effect of boric acid on properties of high‐alumina
The effect of boric acid on the properties of high‐alumina phosphate‐bonded plastic refractory materials at medium temperature is investigated in this work. Powder X‐ray
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Investment materialsSlideShare
Jun 18 2015 · Composition 54 Refractory materials80 Silica (quartz cristobalite or a mixture of two) Purpose • To provide high temperature thermal shock resistance • To provide high thermal expansion. Binder (<20 ) • Magnesium oxide phosphoric acid (liquid) Or monoammonium phosphate (can be incorporated into powder).
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Phosphate binder for production of high-melting compositions
Despite the adaptability for refractory mass and sufficiently high mechanical strength (up to 1200 kgf/cm 2) she had a lack of fire resistance (up to 1350° (C) and because of the scarcity and high cost of titanium metal the cost was very high.. The closest technical solution is chosen as the prototype of the present invention is a phosphate binder to obtain a refractory compositions
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USAAluminum resistant refractory composition
A refractory composition for use in contact with molten aluminum alloys containing a refractory aggregate a binder and 9Al 2 O 3 .2B 2 O 3 . The aluminum borate may be of the type produced as a by-product in the production of ferro-boron alloys and known as aluminum boron slag.
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Jun 05 2011 · The principal difference between gypsum bonded and phosphate bonded investments is the composition of the binder and the relatively high concentration of silica refractory material in the later. The binder consists of MgO and an ammonium phosphate compound contrary to gypsum bonded investments this material is stable at burnout temperatures
Get PriceThe Role of SiC and Different Binders on Mechanical
properties such as particularly their high melting point and their rigidity and strength at high temperatures. In this research different amount of SiC were added to Silica refractory containing different binders such as Borax Boric acid Calcium nitride Sodium tri poly phosphate Sodium
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High-alumina phosphate-bonded refractory castables Al(OH
Aug 01 2015 · Monoaluminium phosphate Al(H 2 PO 4) 3 or MAP is pointed out as the most applied chemical binder in the refractory field due to its solubility in water high bonding strength and reaction with basic and amphoteric raw materials at low temperatures. Nevertheless different routes can induce the in situ generation of Al(H 2 PO 4) 3 in castable compositions. . This work evaluates the effect of
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Ceramic encapsulation of refractory and mineral residues
Mar 01 2008 · Compositions with different types of refractory residues (see footnotes on Table 2) all based on a binder system containing 12 MgO sinter 17 monobasic potassium phosphate and 0.5 boric acid show that independently of the type of refractory it is possible to get ceramic structures with final setting time of 10–25 min compressive
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Self flowing refractory castables study of the hydraulic
Refractories are enabling materials in that their primary function is to facilitate the production of other materials such as metals glasses petrochemicals and cements. They have enabled the utilization of heat to make materials since the Bronze Age. Although in recent years a number of studies concerning the many complex variables that determine the rheologic hydraulic and ceramic
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(PDF) Monoaluminum phosphate-bonded refractory castables
Phosphate-bonded refractories may be applied as repairing materials due to their short setting time and good thermo-mechanical properties in the °C temperature range. This works addresses
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Method for forming a layer of refractory fibers on a
Binder #2 was a mixture of the chromium aluminum phosphate binder matrix with bentonite clay and boric acid in the most preferred formulation previously disclosed. This binder concentrate was diluted 4 to 1 by volume with water and sprayed with alumina-silica-zirconia fiber
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USAPlastic refractory compositions having
Improved gunnable plastic refractory compositions consist of a mass of friable clusters of granular material which has a moisture content of from about 4 to about 10 by weight of the total composition and contains from about 0.05 to about 0.5 by weight (added) preferably 0.1 to 0.3 of a hydrocolloid selected from the class consisting of a polysaccharide ether and xanthan gum and from
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Calcium Aluminatean overview ScienceDirect Topics
The lime content of CAC was one of the factors governing the high-temperature performance of refractory concretes. An 80 per cent alumina CAC contains about 18 per cent lime (CaO) in the form of calcium aluminates. Cements having higher alumina contents (i.e. 90 per cent) and therefore lower lime contents were tried but never really gained
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Introduction
reacts with water and forms boric acid which readily dissolves in water. It is also observed that with increase in B 2O3 content BO 4 units are increased. BO 4 structural units exist as BO 4Na units which readily react with aqueous medium to form sodium borate
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