High Purity Magnesia Castables - Raw Materials for Refractory

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Specifications

color:light grey
Shape: powder or fine powder
Composition:SiO2 Al2O3
CaO TiO2 Fe2O3
widely used in petroleum chemical smelt

High Alumina Refractory Castable is mixed by corundum, high quality bauxite clinker,silicon carbide as aggregate,all kinds of powder,ultra-fine powder,micropowder,á-alumina powder and admixture with mixture rations according to differernt varieties.Its main characters are below:

1 High strengh in normal and medium temperature.

2 Good wear resistance and erosion resistance.

3 Good thermal shock stability.

Main Physical and Chemical Characteristics

Items	Index	NO.
Items	Index	SHF-200	HF-160	HF-135	HF-130
Chemcial composition(%)	Al2O3	>80	>75	>65	>60
Chemcial composition(%)	SiO2	<15	<19	<28	<34
Bulk Density(g/cm³)	110°C×24h	3.0	2.8	2.5	2.4
Bulk Density(g/cm³)	1000°C×3h	2.9	2.8	2.5	2.4
Modulus of Rupture(Mpa)	110°C×24h	12	10	8.5	7.0
Modulus of Rupture(Mpa)	1000°C×3h	18	15	13	11
Cold Crushing Strength(Mpa)	110°C×24h	120	90	68	50
Cold Crushing Strength(Mpa)	1000°C×3h	180	120	95	80
Liner change after buring	1000°C×3h	±0.2	±0.2	±0.3	±0.3
Wear resistance(AMTMc-704)		3.0	5.0	7.0	9.0
Heat Conductivity (W/m.k)		1.6	1.5	1.5	1.5
Thermal shock resistance(times)(1000°C water cooling)		35	30	25	20
Refractoriness °C		1790	1790	1750	1730
Max Working Temperature		1550	1500	1400	1350

FACTORY:

HIgh Purity Magnesia Castables

Q: How to divide fire rating of decorating materials ?: level A: incombustible, B1: Flame retardant, Level B2: combustible, Level B3: Flammable.

Q: What do we mean by saying that a ladle cover knots, elbow knots, blowpipe knots in refractory materials? What is the “knot”?: A less accurate view of the statement is probably the meaning of the “construction of refractory material" , for example, pouring castable can be called “knot”, the pounding of the construction can also be said that, so it is with spraying paint.

Q: Is there requirement for radiation indicator in refractory?: All refractories have no radiated harm to environment, so there is no requirement. From the elemental analysis, magnesite. I do not know it is helpful to you. But for refractory rwa material, any chemical element is radiated, including silicon?dioxide; If they are radioactive. From the use analysis, such as bauxite, do not have use value.

Q: What dose the fireproof and thermal insulation material include?: It includes A1: Non-combustible inorganic monomer; A2 Non-flammable organic compound, namely composite material; A3 Modified phenolic fireproof materials.

Q: How is the performance of refractory materials?: It is a little difficult to answer. There are some requirement for refractory materials, such as fire resistance, softness, creep, thermal shock, abrasive resistance. Besides, requirements for construction performance include: Liquidity, plasticity and other linear change rate, volume density, strength (including high temperature) and all other important indicators must be tested the same conditions with the use of test conditions and test items like body density, strength, line changes in the basic project

Q: What kind of material is refractory bauxite?: Refractory bauxite, also known as bauxite alumina or bauxite with high alumina, is the main raw material for the production of high alumina (aluminum content ≥48%, belongs to LAS) refractory.

Q: Graphite and other carbon materials may be oxidized to CO or CO2 at high temperatures. But why can they be refractories?: There is no contradiction for this. Any substance can be combustible, but different materials have different ignition points.There are many types of graphite. Pyrolytic graphite has a much lower ignition point. Therefore, as long as it reaches at a certain temperature, it can convert into graphite. Mostly, in practical applications (such as brake pads will add a certain amount of graphite), graphite is required to have refractoriness of below 1000 ℃. Graphite can serves as both the combustible and refractory material. So, it can be used as a fire-resistant and high-temperature-resisrant material because graphite (lamellar graphite) has a ignition point of at least 3000 degrees in an oxygen free condition. The above information is for reference only and is offered by Xin Ruida Graphite Company.

Q: What are the specifications of fireclay bricks?: 1. The various classification criteria of clay bricks. First, according to the physical and chemical indicators, they can be divided into these types: (NZ) -42, (NZ) -40, (NZ) -38. Second, the classification of specifications of clay bricks is in line with the stipulations in "general shape and size of refractory bricks". Finally, according to the stipulations of relevant state departments, the clay bricks can be divided into standard bricks, ordinary bricks, special-shaped bricks, special bricks. Second, level of refractory temperature of refractory bricks The refractoriness of refractory bricks is divided into four levels according to changes of alumina content. We know that the components in clay bricks include Al2O3. Alkali metals are also included. The refractoriness of AAA-level clay bricks in Ruitai Refractory Material Factory is 1750 ℃; A-level bricks is 1730 ℃; B-level bricks is 1670 ℃; and C-level bricks is 1580 ℃. The softening temperature under a fixed load of Clay bricks is about 1350 ℃. Clay bricks, also known as sintered bricks, are small size artificial bricks for modern architecture. Clay bricks have good properties and high thermal stability, in which Fe2O3 content is less than 2.0 to 2.5%. Overall dimensions: 230 * 115 * 65mm

Q: How do refractory materials apply into pyrophyllite?: Generally speaking, shaped refractory materials require of some powdery materials like spray grouts and iron trough in addition to pyrophyllite brick made of a mixture of pyrophyllite aggregate and powers.

Q: What refractory materials are used in power plant: And then I will introduce some application of thermal material in power plant (below) I hope I can help you. Energy saving is the trend of future industrial development efforts, grinding machine, conveyor belt, so the production of light thermal insulation materials will gain state support, drying kiln. Our factory mainly produce light thermal insulation brick. The refractory material we use most is light insulation brick, and the equipment used is sand mixer (Luohe, Henan)

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