Steel Flow Initiator---refractory castable---Changxing Refractory

Steel flow initiator is a kind of ladle slid nozzle filler which is successfully developed by our company in recent years, results show that ladle castables success rate of automatic start casting can reach above 95 percent. 

Steel Flow Initiator

Introduction:
Steel flow initiator is a kind of ladle slid nozzle filler which is successfully developed by our company in recent years, results show that ladle castables success rate of automatic start casting can reach above 95 percent. There is no metallic inclusion in ingot surface, is a kind of ideal ladle slide nozzle filler. Steel flow initiator contains metal mixture whose weight is heavier and melting point is lower than molten steel. Before pouring we put it into upper nozzle, using it to burning and causing the molten steel within the upper nozzle will not be solidified, to achieve the purpose of automatic start casting and avoid the problem of ingot inclusions.

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Ladle Gunning Mix---gunning mass---refractory castable

Ladle Gunning Mix

Introduction:
According to the gunning characteristics of gunning mixes and considering the destructibility of slag lines and easily worn parts of ladles, our company specially developed HT series of gunning mixes with the unique binding agent and additives.

Advantages:
1. Strong adhesion, 2. Low rebounding rate, 3. Easy-sintering, 4. Excellent erosion and corrosion resistance

Application:
they are ideal choices for cold/hot repair to slag lines and other parts of ladles.

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Steel mills to reduce the consumption of iron and steel to consider

The reduction of steel consumption by steel mills can be considered in the following areas:
1.Reduce the proportion of molten iron, scrap, stable converter loading
From the practice, to explore the converter cold material in the best combination of chisel and scrap, adjust the molten iron, scrap material structure and furnace volume, in order to reduce material consumption.
2, high pull carbon blowing blowing operation process
Converter smelting the implementation of high-carbon carbon blowing operation process, blowing the end of the steel according to the specifications of some high-carbon, so that the converter end of carbon to reduce the slag TFe content, thereby improving the quality of molten steel, reducing the consumption of converter steel The
3, slag operation
Slag operation is a great economic benefits of the process, some slag can be recycled, high alkalinity of the slag to participate in smelting, reducing the amount of lime, while the residue in the TFe in the next furnace smelting when the recovery, reducing the steel Material consumption.
4, reduce the splash loss
1) the appropriate increase in furnace capacity, increase the effective volume of the furnace, in order to facilitate the reflection of the spatter.
2) to improve the slag process, in the second batch of slag before adding, through the advance slagging method, the peak of the foam slag forward, so that the peak time with decarburization staggered.
3) Temporarily increase the gun position before the peak of decarburization is reached, and then gently return to normal.
4) blowing the final use of pressure gun bit operation, to strengthen the pool stirring.
5, tapping temperature drop
Steel mills take measures:
1) to reduce the number of online ladle turnover, by improving the efficiency of ladle turnover, reduce the heat loss of ladle.
2) casting machine in the package plus insulation cover insulation and the use of long water, immersion nozzle protection measures to reduce the package process temperature drop.
3) ladle baking device regenerative transformation, improve the ladle baking temperature, reduce the ladle heat absorption.
4) converter iron mouth to expand, shorten the steel time, reduce the temperature drop process.
5) ladle outlet to expand, reducing the ladle to the package in the process of temperature drop.
6) converter, continuous casting transformation, shorten the smelting cycle, from 30min shortened to 26min, reduce the process temperature drop.
6, equipment aspects
Continuous casting application Mold liquid level automatic control, automatic water distribution, in the package continuous temperature measurement technology to transform the casting machine, can improve the finished product rate, reduce iron consumption.

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Research on Burning Process of Refractory Brick

The components of the additive are compatible with the glass components and can react with the Cr2O3 at the same time to refractory brick promote the thermal defects in the interior and the surface of the Cr2O3 crystal and the Schottky thermal deformation in the heated state. , To accelerate the process of mass diffusion and surface diffusion of the material firebrick refractory during firing. Some of the components in the additive react with Cr2O3 to form a solid solution, which is crystallized from the melt and deposited at the grain boundaries of the Cr2O3 grains to form a ring crystal band to control the growth of the Cr2O3 grains and to strengthen the intergranular phase Combined to improve the strength of the product. Based on the above considerations, a number of additives were selected for the experimental study, where two representative additives were screened for comparison, one for additive A and the other for additive B.
Effect of Additives on Product Properties. At lower temperatures can significantly promote the Cr2O3 material sintering, refractory castable access to physical and chemical indicators to achieve or exceed the advanced products of similar products. In order to be able to fully crush Cr2O3 at lower temperatures, two techniques have been taken: (1) to improve Cr2O3 fineness as much as possible without affecting the yield of the product. (2) the introduction Refractory company of the ion radius and Cr3 + radius of the similar additives, so that in the appropriate (2) the introduction of the ion radius and Cr3 + radius of the additive, so that the greater the size of the grain, the greater the degree of distortion and radius of curvature of the grain, the higher the activity of the insulation products material, Oxygen partial pressure range sintering to form continuous solid solution and finite solid solution, destroying the ordered arrangement of Cr atoms, leading to the introduction of atomic potential around the change, resulting in Cr2O3 crystal periodic potential field distortion, accelerate the self-diffusion rate of chromium ions, Promote the sintering of Cr2O3 material.

Filler for Well Block---Refractory Castable---Changxing Refractory

Filler for Well Block Introduction:

Filler for well block is produced with magnesia based materials and additive, is characterized by corrosion erosion resistance and easy installation etc. It has good filling effect for ladle well block.

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Discussion on Anti - thermal Impact Anti - corrosion Instrument

Magnetic materials on the quality of the refractory material used by the high demand, so a long time, the domestic magnetic materials production plant refractories mainly rely on imports from Japan, Germany, the price is very expensive. In this experiment, high quality raw materials were used as aggregate. Through the test of the formula and the production technology, the heat resisting and anti-erosion performance was excellent, the strength was high, the effect was good and the service life was long.

Selection of raw materials Taking into Refractory company account the use of bearing seat harsh conditions, in addition to the selection of materials with high strength, good thermal shock stability, strong resistance to erosion and other characteristics, but also on the bearing seat deflection core pollution. After repeated comparison, the final choice of mullite) corundum to be developed for the ideal seat material.

Natural mullite is rare and generally synthetic. Because mullite has good high temperature mechanics and high temperature refractory brick for sale thermal performance, the synthesized mullite and its products have high density and purity, low thermal conductivity and thermal expansion coefficient, high temperature structure strength, high temperature creep rate is low, Thermal shock resistance and strong chemical resistance, the advantages of high melting point. Corundum good elasticity, high melting point, at high temperatures with good wear resistance, chemical resistance and volumetric stability, hardness, high refractoriness. In addition, the refractory materials for furnace mullite crystal is generally columnar or prismatic, corundum crystal is generally granular, mullite, corundum according to a certain proportion with the composition of mullite) corundum composite materials, mullite, corundum with the above excellent performance , And the burning of products without pollution, so mullite) corundum bearing seat can meet the requirements of the use of magnetic materials kiln 1.

Tested the development of refractory mullite-based crystal phase, in the design of the formula to make the material to produce more mullite phase, in addition, select a reasonable particle gradation is a very critical step.

The mechanical properties of the refractory lining mullite series have been studied, and the ratio of 75B25 and 25B75 with the best mechanical properties is proposed. It is pointed out that this is due to the fact that the crystal phases are intertwined with each other The Therefore, this test uses the synthesis of mullite and fumed corundum mass ratio of 3B1 as the green aggregate for the test, the use of four-stage pellet gradation, aggregate size and gradation in the first made a lot of experimental research, For comparison, the aggregate was selected as mullite or corundum. The results showed that the thermal shock resistance of the sample was the best when the mass ratio of mullite and corundum was 3B1. After several tests, several sets of more reasonable particle gradation were obtained.

Selection of additives and their additions This test uses A-Al2O3 powder, Suzhou soil, andalusite concentrate powder, zircon powder as an additive. Their role is as follows: Al2O3 micro-powder with the bearing seat in the free SiO2 reaction to form a second mullite, thereby enhancing the product life. This is because the ferrite within the Mn, Zn, Fe and so on will be volatile at high temperatures, easy with the bearing seat in the free SiO2 reaction, resulting in bearing seat corrosion and cracking, which seriously affected the product life, so The design of the formula must be considered to reduce the free SiO2 content to the extent of the reaction with the above substances. In addition, adding A-Al2O3 powder and Suzhou soil can improve the activity of matrix material, improve the forming performance of the green body and improve the sintering reaction ability of the product.

The experimental results show that the retention rate of residual strength increases with the addition of zirconite powder after thermal shock, and decreases more than 5%. The results show that ZrSiO4 has been decomposed and reacted with alumina to form ZrO2 aggregates and mullite, and the ZrO2 aggregates are evenly distributed in the matrix, To the stone network structure. In this way, the dispersion of ZrO2 is formed on the macroscopically, and a strengthened structure of ZrO2 coalescence is formed microscopically to improve the thermal shock resistance of the material.

Test Measures for Damage to Refractory Products

Through the coloring, contrast and set the value, can find out a lot of performance, in particular, can easily determine the degree of wear, glass-refractory interface displacement or infiltration boundary position; with a quantitative value of visual inspection. The scanning method is intended to improve the accuracy of the evaluation of corroded specimens, rather than for microstructure studies. In fact, the magnification obtained with a flatbed A4 scanner is limited, which is related to the optical resolution of the device (typically 600 dpi to 120odpi). In accordance with the traditional test method, at the test temperature of the kiln, the finely ground aggressive material acts on the refractory materials for furnace. Use a cement to bond the hollow cylinder to a square bottom parallelepiped. Each of the citrus fills 15 grams of container glass. The less the material. In order to obtain accurate results, the residual glass surface was scanned with the new scanning technique described above without using the old time-consuming planar measurement technique. In addition, surface osmosis was measured.

2) image processing; 3) three-dimensional calibration, the pixel conversion into a dedicated length unit; 4) by contrast and threshold determination and other image processing on the selected area for surface measurement, and then on the Infiltration depth for statistical description. This can be done by making a series of measurements along the impregnation area. Using the standard deviation, the infiltration uniformity can be reliably evaluated, and the average value of the impregnation can be determined.

PRI products in all samples, the remaining glass spray paint surface area. In addition, the infiltration degree is limited to a small part of the wall thickness of citrus. The refractory material in the interface area in contact with the glass is free of erosion, even at the glass level, and the result may be low against the degree of impregnation. The sample was placed in an electric furnace, heated to 1400 ° C in 14 hours, then warmed at 1400 ° C for 24 hours, and then cooled to room temperature in an electric furnace. Choose to simulate the actual operation of the soaking temperature. When measuring, cut the sample in half so that the glass-Refractory company interface is cross-section tested. The cross-sectional area of ??the remaining glass was measured by a reliable quantification of the glass-resistant erosion resistance of the firebrick refractory sale.

The ladle package verifies the technical feasibility of the new alkaline spray filler (NB-GM) for slag line repair, especially the product. Further research is done to find the most suitable product / equipment. The first industrial test is carried out in the laboratory, the spray of MgO-C slag line, the performance is as follows: 110 ℃ after the weight loss B, product 5.5% bulk density porosity at room temperature compressive strength 2.69 / m319% 3lMPa it confirmed This material with ordinary alkaline spray products compared to excellent performance. RH-OB Ventilators Compared to conventional spray products, new materials can reduce the total amount of aluminum (external) and alkaline (internal) materials used for repair. The ongoing tests are mainly focused on the automatic installation of the spray, especially for practical applications. This has the same effect as the conventional material used previously. The first comprehensive test of these first tests was very useful, and they clearly confirmed the improved performance compared to conventional jetting. Two similar studies confirm the future trends of LC-GM (aluminum) and NB-GM (magnesia) materials. The new optimization equipment has the best masonry operation, that is, no dust and rebound, masonry rate of 5 a 6t / h. New products, especially aluminum spinel amorphous material is more suitable for ladle overall masonry.