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Henan Hongtai Kiln Refractory Co., Ltd.
Henan Hongtai Kiln Refractory Co., Ltd.
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Magnesia Iron Spinel Refractory Brick for Cement Kiln

Henan Hongtai Kiln Refractory Co., Ltd.

Country/Region:china

Contact Person:MsZhang View Contact Details

Magnesia Iron Spinel Refractory Brick for Cement Kiln

Brand Name : HT
Model Number : follow
Certification : SGS
Place of Origin : Henan,China
MOQ : 1 ton
Price : US $0.5-1.3 / Pieces
Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability : 3000 Ton/Tons per Month
Delivery Time : 25 days
Packaging Details : refractory bricks for lime kilns packaging: By Sea-worthy fumigated wooden pallet + plastic belt + carton + plastic wrap;
Material : Magnesia Iron
MgO Content (%) : 80~85%
Al2O3 Content (%) : 10-15%
Bulk density : 3.0g/cm3
Refractoriness (Degree) : 1770°< Refractoriness< 2000°
Size : Customizable
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Magnesia Iron Spinel Refractory Brick for Cement Kiln

Magnesia Iron Spinel Refractory Brick for Cement Kiln


Product Description

Magnesia-iron spinel brick is a new type of chromium-free refractory for cement rotary kiln that was first developed in Europe in the late 1990s. The product is made of divalent iron-aluminum spinel (FeO·Al2O3) and high-purity magnesia as the main raw material. During the firing process, the firing temperature and firing atmosphere are strictly controlled to ensure the iron oxide in the brick is FeO. Form exists.
In the process of using magnesium iron spinel brick, a layer of highly viscous calcium-iron and calcium-iron-aluminum compound is formed on the hot surface of the brick, which is easy to hang the kiln skin. Magnesia-iron spinel bricks have high thermomechanical properties and thermochemical properties in addition to the excellent kiln skin properties of magnesia-chrome bricks. In some countries in Europe, it has been widely used in cement rotary kiln firing belts and transition belts, becoming a new type of chromium-free refractory material that is likely to completely replace magnesia chrome bricks. The physical and chemical indicators of the magnesia spinel brick produced by a refractory manufacturer are: MgO86%, Al2O33%, Fe2O38%, CaO1.7%, SiO20.8%, apparent porosity of 15%, bulk density of 3.06g/cm3, The normal temperature compressive strength is 66 MPa, and the high temperature flexural strength (1400 ° C) is 2.5 MPa.


Technology

Masonry and use of mafic iron spinel brick
1. Magnesium iron spinel brick masonry and drying kiln situation

The rotary kiln lining adopts a single-layer lining brick ring-laying method and dry-laying. Due to the limited unit conditions of the furnace, the artificial + screw bar is used. In the heating stage before the initial ignition is about to be put into operation, the rotary kiln firing zone (ie, the magnesium iron spinel brick belt) has a high temperature (the local temperature has reached 390 ° C, so that everyone thinks that the magnesium iron spinel brick may be heat conduction. The coefficient is too high quality but not closed. After the feeding, some kiln is stopped immediately after the kiln is closed, and the kiln is cooled and repaired. It is found that the burning zone also has the looseness of the brick. After the treatment, the ignition is again heated to the feeding and firing. After the highest temperature of the belt does not exceed 370 °C, after several reasons, it has experienced several processes such as igniting the kiln for ignition and heating, and found that the temperature of the cylinder is abnormal, and the temperature of the cylinder is the same as that of the magnesia chrome brick. It is also lower. When the temperature of the cylinder is too high when the initial ignition is raised, the temperature of the cylinder should be high due to poor control of the brick joint during the masonry. It is recommended that the masonry of the refractory in the kiln should pay attention to the following items:

(1) The kiln masonry plan and the “kiln masonry construction regulations” shall be provided by the construction unit before the kiln masonry construction;

(2) Conduct brick inspection and construction in strict accordance with the design requirements of refractory materials provided by the design institute;

(3) Refer to the “Code of Practice for Refractory Materials for Cement Rotary Kilns” for construction and acceptance;

(4) Pay special attention to the rotary kiln as far as possible using a bricklayer.

Second, the application of magnesium iron spinel brick during production and commissioning

In actual production, the production line burns quickly with the kiln skin, the thickness of the kiln skin is even and stable, and the refractory bricks have no large-scale slumping phenomenon, and there is no refractory brick peeling phenomenon in the kiln. As shown in Figure 1, the kiln skin in the kiln is evenly flat during the short-term shutdown of the kiln, and there is no pit point. The kiln skin is in good balance during normal production, that is, the clinker partially in the liquid phase when the clinker is calcined adheres to the kiln skin, and naturally falls off when the rotary kiln rotates to a gravity greater than the adhesion force, along the slope Roll down the ball. The thermal system of the firing system is good, and in a certain sense, the quality of the batch of magnesium iron spinel bricks is relatively stable.

Due to the low thermal conductivity of the brick, the kiln skin thickness is uniform during normal production, the kiln load is small, the surface temperature of the rotary kiln cylinder is lower than 300 °C, and the surface temperature of the cylinder of the same kiln type of magnesia chrome brick is often above 330 °C. .

During the production and debugging period, due to various reasons, there have been many cases of ignition and heating, and the kiln has been shut down for maintenance. During several inspections, the surface of the brick has been observed to be less eroded, the surface is basically smooth and smooth, and there is no peeling, alkali cracking or looseness. The brick has good corrosion resistance and good thermal shock stability.


Our Products

Packaging & Shipping

Packaging of diatomaceous bricks

1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,
3.230*114*65mm:512PCS/Pallet, 230*114*75mm:448PCS/Pallet.

Shipping of diatomaceous bricks

1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.

Why choose Us

Henan hongtai kiln refractory co., LTD. Is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".Our company is willing to develop a wide range of technical exchanges with colleges and universities and colleagues from all walks of life at home and abroad in a flexible and diversified way.

Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India, Korea, Pakistan, kazakhstan, Iran and other southeast Asian countries and regions.

Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.



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