Raw Materials for Refractory:Dead Burnt Magnesite MgO 92%

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Loading Port:: Dalian

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Supply Capability:: 2000 m.t./month

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Item	MgO	SiO₂	CaO	LOI	B.D.(g/cm³)
DBM-97	97	0.7	1.4	0.2	3.2
DBM-96	96	1.5	1.5	0.2	3.2
DBM-95	95	2.2	1.6	0.3	3.2
DBM-94	94	3	1.6	0.3	3.2
DBM-93	93	3.5	1.6	0.3	3.2
DBM-92	92	4	1.6	0.3	3.18
DBM-92	92	4	1.6	0.3	3.18
DBM-91	91	4.5	1.6	0.3	3.18
DBM-90	90	4.8	2	0.3	3.18
DBM-87	87	7	2.2	0.3	3.2

Our factory produce the products of the Dead-burned magnesite are selected natural magnesite, it is produced by mine-selecting, purifying, calcimine in shaft kiln. It is an ideal material for unshaped refractory material, the final products are used in open hearth furnace, electric furnace bottom and furnace's lining tamping.

DEAD BURNT MAGNESITE MGO92%

Q:what textures of furnace refractories are good?: Common ceramics use ordinary clay and high alumina bricks, as well as thermal insulation bricks, calcium silicate boards and fiber cotton. The vessels fired with potter's earth are called pottery, and the vessels fired with porcelain clay are called porcelain. Ceramic is generic term of pottery, stoneware and porcelain. The objects taking the two different types of clay as the raw materials, like, potter's earth and porcelain clay, and made through the technological process of ingredients, forming, drying and roasting, ect. can be called ceramics.

Q:What parts of cement kilns are refractories used on?: These parts are decomposition furnace, smoke chamber, kiln, kiln hood, grate?cooler, tertiary air duct and coal pipe.

Q:Who knows what kind of fire protection material is better?: Characteristic of polyurethane rigid foam thermal insulation decorative composite board: (1) ultra high cost performance, increased property's selling point (high cost performance) new model of thermal insulation material, excellent thermal insulation properties, elegant decorative effect, 50 years of service life, reduce maintenance costs and social waste. (2) it overcomes defects of traditional insulation technology (to solve the freezing and thawing, veneer cracking and shedding) traditional benzene board, the phenomenon of freezing and thawing that is easily appear in plastic extruded sheet, paint finish is easy to crack; its veneer facing can easily fall off; thermal insulation materials and wall are poorly adhered, easy off the whole. There is a themal bridge in dry hanging wall. (the characteristics of polyurethane composite board)

Q:What is the the best ratio of mortar in refractory cement?: Specifical proportions are as following: 42.5R cement is 425 rapid hardening cement. Using the 425 cement to compound the mortar. The reducion of cement will naturally impact the workability of the mortar. The mix design standard of the mortar specifies the minimum amount of cement is not less than 200kg / m3. If it is composite mortar, and the strength and workability can be ensured, it is Ok to use 425 to compound. You can look for instructions of mixing proportion of mortar online as a reference.

Q:How many kinds of fireproof materials are there in the market?: A-level materials are the best which will not burn while the B-level materials are made of combustible materials which can burst into flames.

Q:How many fire endurance grades are the AAA fire resisting shutter divided?: According to the fire endurance, the fire doors can be divided into Class A, Class B and Class C fire doors with the fire resistances are not less than 1.20h, 0.90h and 0.60h. Even the fire resistant level of B can also use the first rate fire resistant door.

Q:How is grade of fire endurance divided?: Fire resisting shutter is divided into Class A / B / C, and the relevant fire endurance are not less than 1.2 /0.9 /0.6 hours, see "General technical conditions for steel fire resisting shutter GB 14102-93". 4.3 4.3.1 Classification according to time of fire resistance 4.3.1 Ordinary steel fire resisting shutter (see Table 3) Table 3 and Category Code Refractory time hF1 1.5F2 2.04.3.2 Composite steel fire resisting shutter (see Table 4). Table 4 and Category Code Refractory time hF3 2.5F4 3.04.4 Classification according to refractory time and smoke prevention performance 4.4.1 Ordinary steel fire and smoke resisting shutter (see Table 5) Table 5 category and code refractory time h smoke leakage (20Pa differential pressure) FY1 1.5 ≤0.2m3 / m minFY2 2.0 ≤0.2m3 / m min4.4.2 composite steel fire and smoke resisting shutter (see table 6) table 6 category and code refractory time h smoke leakage (20Pa pressure) FY3 2.5 ≤0.2m3 / m minFY4 3.0 ≤0.2m3 / m min Excerpt completed. Fire shutter used as fire compartment has a fire resistance of 3 hours, and fire shutter set on the upper opening part on the firewall has a fire resistance of 1.2 hours. **** Materials with fire resistance of 3.0 hours are called AAA refractory material (back fire surface). "Building Conventions" have mentioned in places where it is really difficult to set a firewall, fire shutters can be used to separate fire compratment. When using fire shutters whose back surface temperature rise is included as the judging criteria of fire resistance, its fire resistance should be not less than 3.00h; When using fire shutters whose back surface temperature rise is not included as the judging criteria of fire resistance, independent protection of closed automatic water spraying system should be set on the both sides of the shutter, and the duration of water spray should be not less than 3.00h. In summary: Fire shutter is divided into: Grade AAA, A, B and C

Q:Concrete composition and function of magnesia bond used in refractory: Mainly high purity magnesia powder and silica fume, in accordance with the 4:1 ratio of the mixture, that is, we often use in the castable MgO-SiO2-H2O binding system! Compared with cement, the content of CaO is lower, the high temperature strength of the product is increased, and the slag corrosion resistance of the product is increased!

Q:What are the main components of refractory cement?: SiO powder is often used. Ultra-fine powder refers to less than 1 / zm particles which are made by hydrolysis of ethyl silicate or made from recycled dust in the smelting process of ferro-silicon alloy. Non-cement castable refractory are castable refractory material which contains no cement instead it relies on the coagulation and combination by adding ultra-fine powder or sol (see refractory castable), and it is an amorphous material with high activity. Silica sol is made through Ion-exchange of sodium silicate after Na ions are removed. The easiest method is to prepare by reaction of aluminum metal with hydrochloric acid or alchlor. It is a thermodynamically unstable system which has certain requirements for ultra-fine powder and sol. It is different from non-cement refractory castable, Cr2zrOz and etc. It has low impurity content, and can bond with itself, so it has good binding strength. Ultrafine powder used in non-cement castables are SiO2, Al2O3, Cr2zrOz, etc. Such recycled SiO2 powder has an average particle diameter of 0.5 pm, therefore when adding the gelling agent (electrolyte), it can coagulate and give the products some bonding strength. Non-cement castable refractory is made up of refractory aggregate and powder and it is round. Since the use of superfine powder or sol as binder. The size of sol particles are of 0.1 ~ 1 m. Non-cement refractory castable takes oxide or synthetic compound ultra-fine powder or oxide sol-gel which is similar to the chemical composition of material in tungsten castable. There are several ways to prepare alumina sol. The sol used are mainly alumina oxide and silica sol. The surface area is large, and it helps to improve high-temperature structural strength. Non-cement castable refractories rely on oxide ultra-fine powder or sol to coagulate and combinate. It is a refractory castable (also known as chemical bonding castable) which uses chemical binder instead of cement for combination.

Q:What are the types of advanced refractory?: According to the chemical composition of minerals,refractory can be divided into eight categories: 1, siliceous material. 2, aluminosilicate materials. 3, magnesia materials. 4, dolomite materials. 5, chromium materials. 6, the carbonaceous material. 7, zirconium materials. 8, special refractories. 1. refractories according to chemical properties can be divided into three categories: 1, acidic refractory materials. 2, neutral refractories. 3, basic refractories. 1. refractories according to chemical properties can be divided into three categories: 1, ordinary refractories, refractoriness is 1580-1770 degrees. 2, advanced refractories refractoriness is 1770-2000 degrees. 3, super refractories refractoriness higher than 2000 degrees. 3. refractory according to the forming process can be classified into seven categories: 1, natural rock molding process. 2, compression moulding refractories. 3, moulding refractories by casting. 4, plastic molding refractories. 5, ramming molding refractories. 6, injection molding refractories. 7, extrusion molding refractories.

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