2017年10月17日星期二

Characteristic Refractory Material Mud Mixing Method

Characteristics of refractory material mud mixture method is to produce special refractory products, in particular the use of gypsum injection molding, casting and injection molding molding of the mud slurry f operation method is the ingredients of various refractory raw materials, enhancers, Suspending agent, admixture and 30 ~ 40% of the clean water, while adding a wear-resistant lining in the ball mill (mixing mill), after a certain period of mixing fine grinding, made for the production of mud slurry. In the process of making mud, according to the characteristics of materials and mud pouring their own requirements, to control the density and pH of the mud.
Mud mixing method used by the main equipment are ball mill, air compressor, wet iron, mud pump, vacuum degasser and so on.
Paraffin and resin-based binder, at room temperature for the solid refractory materials (or into a sticky), at room temperature, especially law mixture, must be used to increase the method of heating.
The use of hot casting process, the use of paraffin as a binder. Due to the melting point of paraffin in the 60-80 <€, in the first paraffin heated to 100T or more and have good mobility, and then the fine powder raw materials added to the liquid paraffin, the mixing after mixing, made of slurry Wax cake for hot die casting.
The main mixing equipment for heating the mixture is a heated mixing mixer.

2017年8月28日星期一

The difference between insulation material and refractory material

refractory material
refractory material

There are many kinds of insulation products, including foam, mineral cotton products, foam glass, expanded perlite insulation products, EPS powder EPS insulation film, mineral spray cotton, foam cement insulation products. Selection of insulating materials in the construction of the common types of applications and design selection should be consistent with GB / T 17369-1998 "building insulation materials, application types and basic requirements" requirement.
In addition to the material should consider the thermal conductivity of the material, but also should consider the material of water absorption, combustion performance, strength and other indicators. The performance characteristics of different insulation materials see the corresponding classification guide.
Refractory material refractoriness of not less than 1580 ℃ of a class of inorganic non - metallic materials. Refractory degree refers to the refractory cone specimen in the absence of load conditions, resistance to high temperature effect without softening the melting of the Celsius temperature. Refractory materials are widely used in the metallurgical, chemical, petroleum, machinery manufacturing, silicate, power and other industrial fields, the largest in the metallurgical industry, accounting for 50% of the total output of 60%.
Frequently used special materials are AZS refractory brick, corundum brick, directly combined with magnesia-chrome brick, silicon carbide brick, silicon nitride combined with silicon carbide brick, nitride, silicide, sulfide, boride, carbide and other non-oxide refractories ; Calcium oxide, chromium oxide, alumina, magnesium oxide, beryllium oxide and other refractories. Frequently used insulation refractory abrasive
Refractory materials are diatomite products, asbestos products, thermal panels and so on.

Insulation material is used for building envelope or thermal equipment, the heat transfer of the material or material complex, including both insulation materials, including cold materials. Insulation brick on the one hand to meet the building space or thermal equipment, the thermal environment, on the other hand also saves energy. Therefore, some countries will be adiabatic materials as coal, oil, natural gas, nuclear energy after the "fifth largest energy." A material with a strong resistance to heat flow. Mainly used for housing construction of the wall, roof or industrial pipes, furnaces and other insulation and insulation. According to the principle of insulation is divided into:
① porous material. The gas with a small thermal conductivity is filled with adiabatic pores. Generally the air is the thermal resistance medium, mainly the fibrous aggregation organization and the porous structure material. Foam plastic insulation is better, followed by mineral fibers (such as asbestos), expanded perlite and porous concrete, foam glass.
② Reflective material. Such as aluminum foil can rely on thermal reflection to reduce radiation heat transfer, a few layers of aluminum foil or paper with a thin layer of composite structure, can also increase the thermal resistance. Insulation materials are often used in the form of loose materials, coils, plates and prefabricated blocks for the insulation and insulation of roofs, facades and floors of buildings. Can be directly masonry (such as aerated concrete) or on the roof and envelope for the core material, but also paved into the ground insulation layer. Fiber or granular insulation material can be filled in the wall, can also be sprayed on the wall, both adiabatic, sound absorption, decoration and fire and other effects.

More refractory material:
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The use of refractory materials in the metallurgical industry

refractory materials
refractory materials
Insulation Refractory material refers to refractory materials with high porosity, low bulk density and low thermal conductivity. It features a porous structure (typically 40% to 85% porosity) and high heat insulation.

Insulation refractory material used as the furnace insulation layer, lining or insulation layer, can save fuel costs. More types, mainly light refractory products, heat insulation and refractory materials and their products.

Lightweight refractory products

The main light of silicon refractory brick, light clay brick, light high alumina brick and alumina hollow ball products. Usually the weight of light refractory products is usually 0.6-1.2g / cm3, the use of temperature is usually 900 ~ 1350 Yi. Alumina hollow ball products can be used in the following long-term use.

2 refractory fiber and its products

Refractory fiber is a fibrous refractory material, is a new type of high efficiency insulation products. The main production method of refractory fiber is melt blown method, high speed centrifugation and colloid method.

Refractory fiber The main types of aluminum silicate refractory fiber, zirconium aluminum silicate refractory fiber, high purity high alumina refractory fiber, polycrystalline mullite fiber, alumina fiber, zirconia fiber and so on. In addition for low-temperature insulation of the slag cotton, glass fiber and so on. Refractory fiber products are refractory fiber as the primary raw material, processed by the various blankets, felt, board, rope, paper and other high-temperature insulation materials.

Refractory fiber products with small bulk density, low thermal conductivity, thermal stability and resistance to mechanical sensation. Refractory fiber products only 0.1 ~ 0.2g / cm3 bulk density. With fire-resistant fiber products do kiln lining, heat loss is small, saving fuel, heating up fast, especially for intermittent work furnace. In addition, fire-resistant fiber also has a soft, easy processing, construction and other characteristics. At present, the production and use of refractory fiber has been rapid development, metallurgical and other industrial enterprises demand for refractory fiber more and more urgent. After the use of refractory fiber, the energy saving effect is obviously improved.

More refractory material:
http://www.yilongrefractory.com/AllProductServlet?id=1&number=20
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2017年8月21日星期一

Solutions to improve service life of ladle slide gate plate

slide gate plate
slide gate plate
Slide gate plate is the most important part among the slide gate nozzle system, which directly control the flow of the molten steel. Due to long time contact with high temperature molten steel and frequently strong heat impact, it easily got spoiled. Following are some solutions that could promote slide gate plate service life.

1.Types of slide gate plate
It is better to use the alumina- carbon based slide gate plate, which has a good erosion and strong thermal shock resistance. Bonded with carbon material, this type of slide gate characterized with high thermal conductivity and low thermal expansion coefficient.

2.Installation of slide gate plate
Make sure the fire mortar has a suitable proportion, mixed well and suitable proportion and no impurities. Never use the dried and lumpy mortar. It is also not acceptable to mix the new mortar with the used one. Make sure the upper nozzle is clean, no any residue in refractory company slide gate frame and sliding mechanism. Before installation, make sure the slide gate are not deformed or cracked. Keep the slide gate steady and smooth during the installation, and check whether there is any bump and swing after installation.

3.Using of slide gate plate
It is better to adapt auto cast program when casting steel, do not frequently and drastically open or close the slide gate. Once in need of burn oxygen, the slide gate plate must be fully opened and discharge the slide gate sand as much as possible.

Changxing Refractory material not only provides qualified slide gate plate, but also can dispatch technician for site service. Shall be any interest, please contact us.

Article source:
Solutions to improve service life of ladle slide gate plate

E-mail:sales8@chinaelong.com

The notes for using slide gate plate

slide gate plate
slide gate plate
1.Hot mechanical damage, hot chemical erosion and misoperation are the main three reasons for the damage of slide gate plate;

2.Use alumina zirconium carbon slide gate plate, ensure slide gate plate has good erosion resistance and thermal shock resistance; use slide gate and mechanism with reasonable design and even stress distribution, the service life of slide gate plate can be effectively improved;

3.Follow the standard operation procedure during the tapping of molten steel; right and good maintenance of refractory material slide gate plate can also improve the service life of slide gate plate.

Article source:
The notes for using slide gate plate
E-mail:sales8@chinaelong.com

2017年8月14日星期一

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace


Refractory Brick
Refractory Brick
How to choose refractory brick used for different parts of blast furnace?
When choosing refractory brick used for different lining parts of blast furnace, we should follow some principles. The refractory lining of every part should fit the parts thermal current intensity, so that the lining can maintain previous vertebral shape and stability under the impact of strong heat flux.

Here are some methods of selecting refractory brick for every part of furnace lining.

(1) Furnace throat. It mainly needs to withstand impact and abrasion of burden, so generally we use steel brick or water cooling steel brick for the furnace throat.

(2) The upper shaft. Plus the burden descent and ascending gas flow of scour and wear. Therefore, we should choose resistance to chemical erosion and abrasion resistance of refractory material, the most appropriate is high relative density brick, high density, high aluminum brick or phosphoric acid impregnated clay brick.

(3) The middle and lower part of furnace and furnace bosh. The main mechanism of damage is thermal shock, high temperature gas scouring, and impact of alkali metals, zinc and carbon deposition, as well as chemical erosion of the initial slag. For those three parts, we should choose refractory materials with properties of thermal shock resistance, slag erosion resistance and erosion prevention. For blast furnace whose volume is smaller than 1000m3, we can use aluminum carbon refractory bricks used in blast furnace.

(4) Furnace bosh. Hot gas erosion and iron slag erosion are the main reasons for furnace bosh damage, this part of the heat flux intensity, refractory material life not long (as long as 1 to 2 months, as short as 2 to 3 weeks), generally used in refractory degree is high, load softening temperature is high and the volume density of refractory material, such as the high aluminum brick, alumina carbon brick.

(5) Hearth tuber. This site is only in blast furnace of oxidation reaction area, high temperature from 1900 to 2400 DEG C, lining by damage caused by high temperature thermal stress. Composite brick masonry hearth tuyere zone is adopted by the modern blast furnace, material for high alumina, corundum Mo mullite; corundum and silicon nitride combined silicon carbide, useful also hot pressed carbon block.

(6) The lower part and bottom of hearth. For those two parts, we use hot pressing small carbon brick, micro porous carbon brick, and hot semi graphite carbon brick with high thermal conductivity, good resistance to penetration, good resistance to chemical erosion, low porosity and micro aperture, as well as brown corundum or gray corundum brick used for ceramic cup.


Article source:
How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

E-mail:sales8@chinaelong.com

Basic properties of refractory material for steel making

refractory material
refractory material
As we all know that refractory material is of various kinds and is widely used and also of great importance in steel industry. The following are some refractories commonly used in steel industry summarized by Changxing Refractory engineers.

(1) Refractories for converter
Magnesia carbon brick is used for furnace cap, tapping converter mouth, before and after the surface, weld pool and bottom; high strength magnesia carbon brick is used for trunnion and slag line. Usually the MgO content in magnesia carbon brick is 70 ~ 75%, graphite is 16 ~ 20%, bulk density is 2.8 ~ 2.9 g/cm3, compressive strength is 25 ~ 30 MPa. The elements of high strength magnesia carbon brick are the same elements as magnesia carbon brick, but its compressive strength should be 30 ~ 42 MPa.

(2) Refractories for electric furnace
Furnace hearth, furnace slope and molten pool are overall rammed with magnesia clinker, or constructed with magnesia brick which is made of magnesia carbon brick and tar asphalt; high-quality magnesia carbon brick is used for hot and slag line area; magnesia brick and magnetite chrome brick are used for tapping hole and the two sides of furnace door; high alumina bricks or high alumina uncalcined brick are used for furnace cover.

(3) Refractories for UHP EAF
For permanent lining of ultra high power EAF, using magnesium stone; for furnace doorjamb, using magnesia chrome brick; for slag line, eccentric bottom and molten pool, using magnesia brick; for hot spots, furnace wall and tapping hole, using magnesia carbon brick; for furnace cover, using high alumina brick; for tapping hole filler, using high ankerite filling material.

According to the working conditions of various steel furnaces, it can be proved that the refractory material for steel making working circumstance is very bad. Therefore, whatever refractories are used, it must possess the following properties.
(1) High temperature resistant and high refractoriness.
(2) Erosion and erosion resistance to high temperature molten steel and slag.
(3) The steelmaking furnace works discontinuously, thus requires refractory materials for furnace with good thermal shock resistance and spalling resistance.
(4) High mechanical strength, can withstand impact of furnace tilting and furnace charge loading with no damage.

Article source:
Basic properties of refractory material for steel making

E-mail:sales8@chinaelong.com

Characteristic Refractory Material Mud Mixing Method

Characteristics of  refractory material  mud mixture method is to produce special  refractory products , in particular the use of gypsum inj...