Yingkou Ruizhi Refractories Co., Ltd.

Yingkou Ruizhi Refractories Co., Ltd. is a professional China manufacturer of refractory material for high temperature melting furnaces.Ruizhi Refractories supply main products are: Refractory material, refractory brick, refractory castable,refractory nozzle, ceramic fiber, fire brick, insulation material for converter, electric arc furnace, ladle, LF furnace, tundish, foundry ladle, torpedo ladle, etc. Ruizhi has established technical cooperation relationship with some refractory research institutions and universities. Ruizhi Refractories products have been exported to such as South Africa, Australia, Canada, Malaysia, Bangladesh, Iran, Saudi Arabia, UAE, Iraq, Pakistan, Philippines, Vietnam, Singapore, Tajikistan, Indonesia, South Korea, Sri Lanka, Nigeria, Kenya, Ethiopia, etc.

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Kiln refractory selection method

refractory material

1, kiln performance and thermal characteristics. Such as intermittent work of the furnace should use refractory brick china low heat capacity of the material.
2, the safe use of materials temperature, thermal conductivity system, high temperature strength, chemical stability.
3, the use of life.
4, investment costs and maintenance costs.
In general, heavy refractory materials are more focused on a certain technical performance indicators, such as high temperature stability, chemical stability, etc .; light insulation materials more pay attention to put into operation and comprehensive technical and economic indicators.
The selection of lightweight insulation materials, the general thermal conductivity is used insulation material (λ) furnace refractory suppliers and the cost per unit volume of insulation material (P) to determine the value of the product of "λΡ" the smaller the better. Thermal conductivity value is small, indicating insulation material insulation effect is good, low energy costs during operation. The low cost per unit volume of refractory China insulation material indicates that the investment cost is low and the investment economy is good. You can use the graph plotting diagram selection, abscissa for the working temperature, ordinate (λΡ) good plot, the material safe use of temperature interception of the curve of the material, select the technical and economic performance of the material.

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Insulation refractory materials for aluminum electrolytic furnace and tank construction furnace

refractory materials

Aluminum electrolysis furnace, tank construction furnace insulation refractory materials mainly include the following three:
(A) diatomite thermal insulation material
Diatomaceous earth is the algae organic matter after corruption, the formation of the crustal changes. The main component of diatomite is amorphous silicon dioxide is generally between 70% and 85%) and a small amount of clay impurities, the melting temperature in the range of 1000 ℃ to 1200 ℃. Diatomaceous earth is composed of fine stomatal organization, its porosity up to 85%, so it has good thermal insulation properties, is widely used as a thermal insulation material.
1, diatomite asbestos powder (chicken feather ash), diatomite asbestos powder is a powder insulation material, made of asbestos fibers and diatomaceous earth powder; which accounted for 85% of diatomite powder, fiber 2-5 mm Asbestos accounted for 14%, 5 ~ 20 mm of asbestos accounted for l%, it is used to masonry Insulating refractory brick wiping surface.
2, light diatom brick, light diatomite brick is made of diatomite and additives by molding, drying, at 850 ℃ a 900 ℃ firing. Diatomite refractory brick suppliers bulk density, porosity, heat resistance at 1280 ℃ above, therefore, light diatomite brick can only be used in the insulation below 900 ℃, can not directly contact the flame. In case of high temperature, it will produce shrinkage, or even melt.
(B) asbestos (insulation materials)
Asbestos is the only natural mineral fiber that can be loosened into elastic fibers. According to the different natural conditions at the time of creation, the asbestos and amphibole asbestos can be divided into two categories, the most widely used asbestos asbestos, also known as chrysotile, its chemical formula is 3MgO · 2SiO2 · 2H2O. Asbestos The board is made of 65% asbestos and 35% bonded material and is used primarily as a liner or insulation for equipment. Loss on asbestos board should not exceed 18%, longitudinal tensile strength should not be less than 1.4MPa. Asbestos board structure and thickness must be uniform, smooth surface, consistent cross-section, no scarring, pores and cracks. Asbestos board general specifications for the 1000 × 1000mm (thickness from 1.6 to 16mm), the weight of each 1mm thickness, weighing about 1.3kg / m2. The maximum temperature does not exceed 500 ℃.
(C) Calcium silicate insulation refractory products
Calcium silicate insulation refractory products is a calcium silicate hydrate as the main component of the insulation material. Industry is based on lime, silicic acid as raw material, autoclaved in the autoclave synthetic hydrated calcium silicate, and then appropriate to add asbestos and other fibrous materials, the pressure after the formation of the porous structure of the insulation products. calcium silicate insulation products provides the technical conditions of calcium silicate insulation products.

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The role of variety bulk refractory material in artillery mud

refractory material

The preparation requirements of the stemming is the most error of each material weighing <0.5%, each weight of 250Kg feed according to a certain feeding order, require mixing, the total mixing time is 8 ~ 10min; prepared the temperature of the stemming 50 ℃, the upper limit of the mixture particle size <3 mm, while less than 0.088mm more than 40%, moisture <4%. The role of various bulk refractory materials in stemming is described below.
1, high bauxite
High bauxite particles and fines increase the fire resistance of stemming. The results of slag rotation erosion test show that the loss of stemming decreases with the increase of alumina content. Japan from the erosion of stemming mechanism found that the surface of the old aluminum high artillery mud although the electrical found SiC, alumina and other particles fall into the slag, but did not find the dissolution of alumina particles. In Japan, the use of electrically-conductive alumina is more common. Based on the national conditions in our country, it is appropriate to use super-rich or first-grade high-alumina bauxite which is rich in sources, inexpensive in bauxite, and capable of meeting the performance requirements.
2, silicon carbide
Carbide refractory with high strength, resistance to hot metal and molten slag erosion, high thermal stress characteristics. The quality of silicon carbide should match the quality of the aggregate, from the cold and the use of requirements, SiC content of 50% and 70% of the two to choose from.
3, sericite
Sericite as a ceramic binder to make mud with low temperature strength. Due to the high content of alkali metal, the refractoriness drops, the quick-drying gunnable can be rapidly dried and hardened in a large temperature range (500-1650 ℃) to form a continuous strength, which can shorten the pumping time and win the maintenance of the iron mud Set and repair the main trench ditch time, reduce the glowing ditch lining of the mud gun baking. Sericite can also increase the rheological properties of mud, mud plasticity and lubrication properties are properly raised. Its dosage is less, require mixing evenly in the mud.
4, refractory clay
Refractory clay is an inorganic binder, forming a ceramic bond at high temperature, which makes the stemming at medium and high temperature (900 ~ 1440 ℃) to obtain sufficient firing strength, good plasticity at room temperature. On the grain size is extremely strict, more than 0.088mm into less than 5%, can increase the "slip" effect of stemming, mud can reduce the launch pressure.
5, expansion of materials
In the taphole, the stemming is a layered or massive structure, and stripping and shedding are one of the major causes of wastage. One of the measures to be taken may be to increase the tackiness of the old stemming and the new stemming by adding an expanding material . The amount of expansion agent added to increase the effect of swelling is significant. Production of gun mud line rate of change should be controlled within ± 0.5%, if the amount is too large, then generate more low melting point compounds, the loss becomes larger, and control the amount of added is necessary. The addition of a bulking agent improves the expansibility of the shotcrete, improves the adhesion between the new shotcrete and the old shotcrete, and improves durability.
6, Coke powder
Coke powder has high slag resistance and abrasion resistance, good air permeability, carbon products in the molten iron slag through and after the condensation process, are not bonded with the slag iron. Coke powder in the mixture of particle size requirements <l mm, too large will affect the plasticity. The higher the fixed carbon content the better, the water as low as possible. Coking powder in the coke generally from the blast furnace under the coke, the φ750 × 500 crusher broken <5 mm the following use.
7, asphalt
Softening temperature of 105 ~ 125 ℃ hard pitch, softening better plasticity, coke formation under high temperature carbon network structure, so that it has a high temperature strength stemming, volatile in the plug after the pores in the small Conducive to the drying mud stem. As the softening temperature of bitumen increases above 200 ° C, there are more components forming the high polymer in the bitumen which will enhance the coking performance of the bitumen. Hard asphalt mixing mill in the work of the flood (≤ 50 ℃) insoluble tar, help hand-cranked mud preparation and plasticity increase.
8, off-anthracene oil
Desiccant anthracene oil as binder and plasticizer Jing use, at room temperature (50 ℃) to shoot with a good relaxation and coke at high temperatures (1200 ~ 1500 ℃) coke ability to enhance the strength of mud.


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Continuous use of functional refractories

tundish nozzle

With the development of continuous casting, the proportion of high-clean steel production increased, sliding water mouth with skateboard, long nozzle, the sink, the outlet, immersion nozzle and other flow control and blowing function of the need for a sharp increase in refractory materials. In contrast to the earlier use of imported refractory bricks and other imported bricks of different circumstances, continuous casting refractory materials are still dominated by domestic production of products.

Sliding with a skateboard, the main use of aluminum carbon, and later, due to improved material, the use of improved conditions, greatly improved the number of durable. Material, due to the addition of zirconia, peeling resistance greatly improved. According to the experimental and stress calculation, the shape of the skateboard is improved, which inhibits the generation and expansion of the crack. Due to the miniaturization of the skateboard and the re-use of the rear skateboard, the consumption of the refractory suppliers material is reduced, so that the iron making is propelled. On the other hand, the development of high-corrosive steel slabs such as Ca-treated steel and high-carbon steels has been developed. For example, an aluminum-magnesium carbon alkaline skateboard having both corrosion resistance and peeling resistance has been developed.

Long water tundish nozzle is the most recent 10 years to improve the maximum refractory material, recently, long water mouth life can reach 30 furnace or 40 furnace is not surprising. Preheating, insulation and residue cleaning and other aspects of the use of improvements, for the extension of life has a significant effect. Material, to take to strengthen the strength of the bowl material, inhibit the inner tube steel wear, to prevent external oxidation and to prevent peeling and other measures.

Immersion nozzle, its characteristics and the flow pattern within the mold and the relationship between the quality of slab larger, it is generally from the material and shape of the two aspects of development and improvement. Material development is representative of the nozzle inside the alumina difficult to adhere to the development of materials. Generally use ZrO2-CaO-C material, the recent widespread use of carbon-free lining. Shape of the development, there are ladder-type immersion nozzle, this nozzle can effectively prevent the bias current, reduce the nozzle inside the alumina adhesion. In addition, a scheme for the use of a swirling flow nozzle and a vortex flow nozzle with spherical protrusions is proposed, and a furnace test is underway.

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