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US4849383A - Basic refractory composition - Google Patents

The basic refractory composition consists of a synthetic calcium zirconate based clinker in coination with raw materials for magnesia; the molar ratio of CaO to ZrO 2 in said clinker is in the range of 0.5-1.1, at least part of said clinker being in the form of particles having a size not smaller than 0.5 mm, ZrO 2 being present in an amount

refractory magnesia-carbon scrap as a valuable secondary

refractory magnesia-carbon scrap as a valuable secondary raw material introduction Magnesia-carbon scrap is used in the refractories industry particularly in countries with - out resources of natural graphite and magnesite. The scrap was obtained during the demoli - tion of the lining of oxygen converters that represent the most important installations for the production of steel with a BOF

[PDF] Analytical Characterization of a Magnesia–Graphite

Magnesia–graphite refractories are currently essential for the iron and steel industry. As a result, their physico-chemical characterization is crucial with a view to predicting their service life. In this work, a methodology for the complete analytical characterization of such materials has been developed. Magnesia–graphite refractories generally contain elemental phases (C, Si, and Al

Influence of raw materials morphology on properties of

Keywords: Refractory materials; Spinel 1. Introduction The type of refractories containing spinel MgO·Al2O3 (MA) named nowadays magnesia-spinel products (MSp)1 was patented first time in 1932 in Austria. This material was manu-factured by introduction of alumina into the magnesia mixes.2 During the firing alumina reacted with periclase and

MINERALOGICAL STUDY AND PROPERTIES OF MAGNESIA

magnesia-spinel refractory materials from natural Greek magnesite. The magnesite of N. Evia, Greece, is micro- crystalline and has been used for the production of basic refractories because of the very low amounts of impurities such as CaO, SiO 2, FeO(tot), B 2O 3 it contains . Magnesia materials studied here are: 1) Raw materials. The dead- burned magnesia grains examined are divided into two

Introduction to the Characteristics of Refractories and

03.10.2013· Refractory material must maintain dimensional stability under extreme temperatures (including repeated thermal cycling) and constant corrosion from hot liquid and gases. In the creep test, specimen of 50 mm diameter and 50 mm height with an internal bore for the measuring rod is heated at constant rate and under a given load (generally at 0.2 N/Sqmm). After the required temperature is …

(PDF) Processing of refractory materials using various

PDF | Magnesia (MgO) is widely used in the production of refractory materials due to its high melting point, high thermal shock, and excellent slag | Find, read and cite all the research you

INNOVATIVE MAGNESIA-CHROME FUSED GRAIN MATERIAL …

INNOVATIVE MAGNESIA-CHROME FUSED GRAIN MATERIAL FOR NON-FERROUS METALS REFRACTORY APPLIIONS D. Gregurek RHI AG, TC Leoben T. Prietl RHI AG S.B. Breyner RHI AG, TC Leoben A. Ressler RHI AG, TC Leoben N.-M. Berghofer RHI AG Abstract The complexity of metallurgical processes in the non-ferrous metals industry. especially changes in the process …

Magnesia refractory dryout–managing

Magnesia refractory material is utilized extensively in the ferrous3 and non-ferrous4 industries to ensure the integrity of the furnace vessel containing liquid metal and slag6. One of the disadvantages of magnesia refractory material is its tendency to hydrate with subsequent loss in furnace integrity4. Kotze et al.10 reported on a typical example of such a delay which took place in South

Introduction to the Characteristics of Refractories and

03.10.2013· Refractory material must maintain dimensional stability under extreme temperatures (including repeated thermal cycling) and constant corrosion from hot liquid and gases. In the creep test, specimen of 50 mm diameter and 50 mm height with an internal bore for the measuring rod is heated at constant rate and under a given load (generally at 0.2 N/Sqmm). After the required temperature is …

Studies on Synthesis and Characterization of Magnesia

The present work intends to study the properties of magnesia based refractory aggregates developed from Indian magnesite by changing lime/silica ratio. The material has been sintered in the temperature range of 1550C - 1700C. The sintered samples are characterized in terms of bulk density, apparent porosity, true density, percentage densifiion, mechanical, thermo-mechanical properties like

types of refractory materials pdf in switzerland

2012-5-29 · refractory materials such as magnesia, which has a melting point of 5070 degrees. Requirements of Right Refractory The general requirements of a refractory material can be summed up as: 1) Its ability to withstand high temperatures and trap heat within a limited area like a furnace; Get Price. FURNACES AND REFRACTORIES - Modern Eq. 2019-9-4 · 2. TYPES OF FURNACES, …

ZIBO Jinggan Refractory Import &Export CO

This product selected high purity fused magnesia sand as material, and molded by high pressure and sintered by high temperature. Consequently, this product has good compactness, and its bulk density is more than 2.9g/cm3.It also has good performance of alkali resistance, corrosion resistance, abrasion resistance and high-temperature resistance. With high purity fused, dead-burned magnesite and

Refractory Materials - [PDF Document]

03.11.2014· PDH Course M158 Overview of Refractory Materials A. Bhatia, B.E. 2011 PDH Online | PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax: 703-988-0088…

Properties of Refractories - Mu

incorporating small quantities of calcium, magnesium and cerium oxide, etc. Its properties depend mainly on the degree of stabilization, quantity of stabilizer and quality of the original raw material. Zirconia refractories have a very high strength at room temperature, which is maintained up to temperatures as high as 15000C. They are therefore useful as high temperature construction

Overview of Refractory Materials

refractory materials such as magnesia, which has a melting point of 5070 degrees. Requirements of Right Refractory The general requirements of a refractory material can be summed up as: 1) Its ability to withstand high temperatures and trap heat within a limited area like a furnace; 2) Its ability to withstand action of molten metal , hot gasses and slag erosion etc; 3) Its ability to

Refractory Systems for Steel Casting and Treatment Ladles

cover projects, material specifiions, thermal studies, numerical simulations, follow-ups and technical support in appliion of minerals, and maintenance and electromechanical services for refractory equipment. Europe North America Asia Pacific South America 2 COUNTRIES 6 COUNTRIES 1 R&D HUB 17 COUNTRIES 1 R&D HUB 1 R&D CENTER 3 COUNTRIES

Theory and Appliion of Magnesia Ramming Material in

transformation of refractory materials. Vitality and economic benefit are brought to the Chinese industry by the replacement of magnesia brick with ramming material. Since the first medium carbon ferrochromium furnace adopted ramming material in Jilin Ferroalloy Company Limited, all Chinese large and medium ferroalloy enterprises have used the new materials in their refining furnaces. All

refractory magnesia-carbon scrap as a valuable secondary

refractory magnesia-carbon scrap as a valuable secondary raw material introduction Magnesia-carbon scrap is used in the refractories industry particularly in countries with - out resources of natural graphite and magnesite. The scrap was obtained during the demoli - tion of the lining of oxygen converters that represent the most important installations for the production of steel with a BOF

Industrial Minerals Networking | IMFORMED – Magnesia

26.05.2019· Trends in the refractories industry to evaluate use of new and alternative materials and product formulations will continue as will increased refractory recycling and use of recycled material.” concluded O’Driscoll. O’Driscoll also suggested that sluggish steel market growth in the West may increase magnesia diversifiion into speciality markets, pushing alternative processing and

Companies - Refractory materials, magnesia - Tamil Nadu

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Electrofused Magnesio-Chromite: Complex refractory material

materials: chromite from ore, magnesia, and electrofused magnesio-chromite as well as electrofused magnesia. On the one hand, many of those raw materials come from mine and from manufacturing processes like electrofusion in order to purify them and increase their refractory properties. On this way, it is possible to go further

US4849383A - Basic refractory composition - Google Patents

The basic refractory composition consists of a synthetic calcium zirconate based clinker in coination with raw materials for magnesia; the molar ratio of CaO to ZrO 2 in said clinker is in the range of 0.5-1.1, at least part of said clinker being in the form of particles having a size not smaller than 0.5 mm, ZrO 2 being present in an amount

[PDF] Crack-free caustic magnesia-bonded refractory

A growing interest in designing high-alumina MgO-bonded refractory castables has been identified in recent years due to the magnesia ability to react: (i) with water at the initial processing stages of these materials (inducing the precipitation of brucite phase) or (ii) with alumina, giving rise to in situ MgAl2O4 generation at high temperatures. Nevertheless, despite the great potential of