2017年4月17日星期一

The function and application of casting powder

Since the beginning of the 60s 20th century, the first time using submerged nozzle and casting powder, casting powder technology has been highly developed. Different casting powder adapted to different slab section, steel and casting process was developed. The surface quality of the billet is greatly improved and the surface of the slab is gradually improved. The basic functions of mold powder are: to protect the mold meniscus molten steel from the secondary oxidation of air; has good spread performance and thermal insulation properties, to prevent the molten steel surface solidification or crust; can absorb the float to Meniscus non-metallic inclusions;   .........................

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2017年4月5日星期三

Analysis of Refractory Sintering Process of Core Furnace

Industrial furnace iron liquid treatment, sensor removal and docking of this work for the sensor replacement of the core part of its quality and progress related to the success of the entire construction. The temperature of the furnace refractory lining can not be reduced to below 80 ℃ during the quick change process, otherwise the lining will be cracked to affect the life of the entire lining. Therefore, in ensuring the quality of construction under the premise of the progress must be. In addition, the throat cleaning is particularly important, the electric furnace throat should be as far as possible to remove the original size; docking surface of the slag must be clean, to ensure that the opposite paste Yan, or easy to lead to the interface of leakage of molten iron. To empty all the molten iron from the throat, you should protect all the hose in the pit to prevent being burned.
When the resumption of transmission for the sensor refractory material sintering, melting solid iron mold temperature reaches the left and right, that is, iron began to melt, should be injected into the furnace iron injection, or there may be broken. So the melting of the 5 - 8t molten iron in addition to the normal process by the cupola to provide, but also should be emergency prepared. If the furnace temperature measurement of the thermocouple accidental damage, should be based on changes in the coil current to determine when the liquid into the liquid, because the melting mold temperature exceeds the magnetic transition point 70 ℃ (Curie point), the cast iron organization Of the ferrite that becomes non-magnetic, the magnetoresistance increase map, according to the transformer principle, will lead to coil current surge, this time can be injected into the molten iron. The site should be prepared enough of the trough, in the new sensor for leakage of molten iron or broken trench accident, the electric furnace filled with molten iron (for 30t with a core furnace, the furnace will be up to 45t molten iron) To save the furnace refractory lining and equipment to prevent accidents to expand and reduce losses.

2017年3月14日星期二

Mechanical Analysis of Ceramic Thermal Insulation Board in Boiler Insulation

In order to solve the boiler and coal load and load adaptability, according to the boiler required by the minimum stable load and coal characteristics, based on the two or three insulation products board laminated structure adjustable adjustable combustion zone.

Each group of adjustable fuselage device mainly consists of inner, middle and outer three layers of insulation board, each insulation layer by the microporous ceramic insulation board using embedded method and heat-resistant steel structure of the integrated structure of the insulation board The

Ceramic insulation refractory fiber board ceramic fiber paper directly exposed to the flame, the steel structure from the heat-resistant flat steel or angle welded together, from the flame directly. The heat-resistant side of the ceramic insulation board is processed into a smooth plane, and the back-fire side is a microporous structure layer, and its pore density can be controlled between 0.5 and 2.0 mm by the foaming manufacturing process.

Due to the use of embedded structure, under normal circumstances, ceramic insulation board from external force, and therefore its strength is not high. The friction of the entire insulating castables layer and the friction in the movement of friction by the steel structure of the insulating castable refractory layer, therefore, the entire adjustable combustion belt design requirements to ensure that: in the furnace conditions, each activity of the insulation layer of steel The actual operating temperature does not exceed its permissible long term operating temperature limit and requires sufficient strength margin.

2017年2月5日星期日

Why do refractory castables with mobility

Castable is a very wide range of refractory material, for its extensive use mainly because of its performance advantages, and significant features, we may be able to understand, it has a certain liquidity, it is because of the What, where Xiaobian to tell why the castable materials with liquidity.


The refractory castable is a kind of granular and powdered material made of refractory material, which is composed of a certain amount of binder and water.It has high fluidity, suitable for construction by pouring method and can be hardened without heating. It is made up of refractory aggregate, powder, binder, admixture, water or other liquid materials.It is usually cast in the field by casting, vibration or tamping, and can also be used as preform.

2017年2月4日星期六

How to extend the service life of medium frequency induction furnace

To extend the life of induction furnace is the only pursuit of each casting, but there are also the significance of the enterprise. The main factors affecting the service life of the intermediate frequency furnace include refractory lining and furnaces in the paving process, the furnace construction process, the baking process and the use process. The following highlights the introduction of two aspects.

Furnace lining lining refractories refractory material quality and performance of the refractory furnace has a vital impact on the life of the furnace. Therefore, they must meet the following requirements.

1. First, the furnace refractory must have good performance. First of all, refractories need to have a relatively high refractoriness to resist heat loads at high temperatures and will not be softened and melted. Second, at the same time, in order to resist the high temperature heat load, they must have high capacity stability. It must therefore be realized that its volume will not shrink, even if inflation is only allowed to exist. Third, they must have relatively high atmospheric temperature strength and high temperature thermal strength and high enough load, for this purpose this force is still in the high temperature of the heat load and heavy load which does not interact with creep and folding. Fourth, it is required to have good thermal shock resistance to resist severe temperature changes and cracks or not appear. In addition, a good slag resistance is also required.

2. Refractory content. Impurities Refractory company products will form refractory compounds with low refractory refractory properties when the temperature is high. The impurity content in the refractory material increases, and the service life of the furnace is shortened. Therefore, it is necessary to ensure that the quartz content and impurity content in the furnace sand must be strictly controlled.

3. Particle size of the refractory fraction. Reasonable particle size fractions make the Hall of Fame postpone high-density coatings very easily during furnace construction in the form. Therefore, the defect is not easy to appear in the course of using. Paving the quality of the furnace furnace life and the importance of safe intermediate frequency electric furnace. First of all, check whether there is damage to the coil paving, heat treatment furnace front. If it does not exist, repair it by painting the damaged portion of the varnish. Stir the refractory clay with water glass, equivalent to the furnace wall, and then clean the furnace wall and floor. Third, has spread the pre-sheared mica plate, alarm stainless steel mesh and asbestos cloth. Fourth, the stainless steel wire mesh with copper core and pierce it from the furnace coil. Next, use three piston rings to tighten the bottom, middle and top asbestos cloths laid on the furnace wall. Finally, cover the furnace after paving to prevent debris fall into it.

2017年1月12日星期四

Analysis on Product Characteristics and Classification of Mullite Insulating Bricks


Mullite insulation brick is mullite (3Al2O3 · 2SiO2) as the main phase of the high-alumina refractories. General alumina content of 65% to 75%. Mineral composition In addition to mullite, which contains the lower alumina also contains a small amount of glass phase and cristobalite; containing higher alumina also contains a small amount of corundum. Mullite insulation brick can be directly used for high temperature furnace lining, has been widely used in shuttle kiln, roller kiln, glass and petrochemical furnace lining.

First, the mullite insulation brick product features:
1, low thermal conductivity, with good insulation effect;
2, mullite insulation brick low melting, due to low thermal conductivity, mullite series of lightweight insulation brick accumulation of little heat energy, intermittent operation in the energy-saving effect is obvious; 3, impurity content is very low, Metal and other oxide content, therefore, high refractoriness; higher aluminum content in the reducing atmosphere to maintain good performance;
4, mullite thermal insulation brick high pressure strength;
5, the appearance of accurate size, speed up the masonry speed, reducing the use of refractory material mud to ensure the strength and stability of masonry, lining to extend the life;
6, mullite insulation brick can be processed into a special shape. To reduce the number of brickwork and joints.
Second, the mullite insulation brick classification: mullite insulation brick according to the density of different light and heavy mullite bricks, according to the use of different temperature is divided into: 1350 mullite insulation brick, 1450 mullah Stone insulation brick, 1550 mullite bricks and so on. Mullite insulation brick performance and its application: high refractoriness, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good. There are sintered mullite bricks and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and fireclay refractories as raw materials, by adding charcoal or coke fine particles as a reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

2017年1月11日星期三

Analysis on firing method of mullite refractory brick

Mullite bricks are sintered mullite bricks and fused mullite bricks.
Mullite Insulating Firebrick refractoriness higher, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good.

Mullite bricks are sintered mullite refractory brick and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and refractory clay as raw materials, by adding charcoal or coke fine particles as reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has a better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.