Refractory News

Reducing the production cost per ton of steel is an effective way for steel companies to improve their competitiveness. Minimizing controllable heat loss within the ladle is an effective measure to reduce production costs and save energy. By covering the ladle and using corresponding cover-opening devices, radiative heat loss is significantly reduced. The ladle is […]

Given the unique characteristics of electric furnace cast iron smelting, foundry professionals must update their thinking in many areas—including cast iron composition selection, charge composition, scrap steel usage, inoculation processes, carbon enrichment and de-carbonization, sulfur enrichment and de-sulfurization, spheroidization processes, creep hardening processes, temperature control, and pouring techniques—and adopt practical measures to ensure and improve

Electric furnace covers are subjected to both high temperatures and frequent rapid heating and cooling, placing high demands on refractory materials. The refractory materials used in electric furnace covers in my country have evolved from initially using large, specific silica composite bricks, to non-fired high-alumina bricks prepared with various binders (water glass, phosphoric acid, aluminum

The design of the electric furnace, as well as the selection and arrangement of the refractory materials used for its lining, significantly influence the operating cycle of the converter. The following details the design of the electric furnace’s roof, hearth, and furnace chamber, along with the configuration of the refractory materials utilized for the lining.

1.Check the furnace body’s operating condition This includes the inspection and treatment of the furnace body yoke, hydraulic system, water cooling system, induction coil and its insulating varnish, coil paste, and empty furnace test. (1) Visually inspect the furnace body yoke fastening screws for looseness. If loose, they must be tightened. At the same time,

The working frequency of a medium-frequency induction electric furnace (hereinafter referred to as a “medium-frequency furnace”) ranges from 50 to 2000 Hz, and it is widely utilized for the smelting of both ferrous and non-ferrous metals. Compared to other casting equipment, medium-frequency induction furnaces offer numerous advantages, including high thermal efficiency, short melting times, minimal

High-alumina bricks are aluminum silicate refractory materials containing an Al₂O₃ content of 48% or higher. Due to their high alumina content, they are classified as high-alumina refractory materials. They can also be categorized into grades based on their Al₂O₃ content; for instance: First-grade high-alumina bricks contain >75% Al₂O₃; Second-grade high-alumina bricks contain 65%–70% Al₂O₃; and

The task of thermal insulation construction is to assemble the primary insulation layer, reinforcing materials, and surface finish materials into a thermal insulation structure according to design specifications. Currently, there are seven commonly used construction methods for thermal insulation structures. 1.Coating insulation method Using unshaped insulation materials (such as expanded perlite) mixed with a binder

When selecting and purchasing refractory materials, we often find ourselves overwhelmed by their diverse performance metrics, operating temperatures, and application ranges. However, understanding the raw materials used in various refractories enables quick identification of suitable options. Therefore, today we introduce the 8 most common raw materials for refractories used in the high-temperature kiln industry. This

Refractory materials refer to substances that maintain structural and performance stability under high-temperature conditions. They are widely used in high-temperature industrial furnaces, kilns, furnace linings, and other equipment within industries such as metallurgy, ceramics, glass, and cement. Below are the types of refractory materials and their primary applications: I. Classification by Composition 1.Acidic Refractory Materials

Application of High-Temperature Anti-Adhesion Coatings on Ladles. Currently, magnesium-carbon bricks are widely used for ladle slag lines worldwide. Their excellent resistance to slag erosion stems from the poor wettability of molten slag on the carbon content within these bricks. However, magnesium-carbon bricks in the slag line are prone to oxidation due to their proximity to

The aggregate for magnesia-carbon bricks used in ladle slag lines is generally ordinary fused magnesia with a MgO mass fraction of ≥97.5% or ≥98% (97.5% MgO mass fraction) or 98% (98% MgO mass fraction). However, in refining processes where the conditions are more demanding, large-crystal fused magnesia is often used. The carbon mass fraction is

The use of sliding plate slag blocking in converter tapping is one of the most advanced methods internationally, and also one of the most challenging slag-blocking technologies. The refractory material of this system mainly consists of five major refractory elements: the tapping nozzle brick, the inner nozzle brick, the upper sliding plate, the lower sliding

1.The application and features of the overall stopper rod At present, the common aluminum-carbon integral stopper rods have rod heads made of high-aluminum-carbon, aluminum-zirconium carbon, magnesium-carbon or other materials. Units 5 to 10 used aluminum-carbon-zirconium integral plug rods before 2011, which were used in conjunction with the nozzles. The liquid level control of the mold

A novel anti-oxidation coating was applied to magnesia-carbon brick samples for laboratory testing and then applied to magnesia-carbon bricks in the slag line of a steel ladle for on-site testing. The results showed that below 1100℃, the coating provided excellent anti-oxidation protection for the magnesia-carbon brick samples, with the loose layer and decarburized layer thicknesses

The effects of carbon content variation on the slag resistance, oxidation resistance, high-temperature flexural strength, and thermal shock stability of magnesia-carbon bricks were investigated. The results indicate that as carbon content increases, the bulk density and compressive strength of the magnesia-carbon bricks decrease. When carbon content ranges between 6% and 8%, the bricks exhibit superior

Samples of the stopper rods for continuous casting ladles produced by a certain factory were analyzed, examining the structure and composition of the rod body, rod tip, oxidation-resistant coating, and anti-adhesion coating. Results indicate: The outer layer of the stopper head contains a higher proportion of granular aggregates and exhibits a denser structure than the

1.Causes of leakage accidents at the ladle outlet of converter: Leakage incidents at the ladle outlet of a converter are often closely related to multiple factors. Experienced technicians indicate that the following aspects are the primary causes of such accidents: (1) Insufficient sintering of the refractory lining in the tapping nozzle caused refractory material spalling

The measures to extend the life of the taphole are as follows: (1) Reduce the amount of slag discharged at the beginning and end of tapping (Figure 5-2). At the same time, a slag blocking process should be used to block the slag during tapping. (2) If necessary, the slag can be reversed from the

The converter’s sliding plate slag-blocking technology, currently the most widely used and challenging, is used for steel tapping in converters. The refractory material in this system primarily consists of five components: the taphole brick, inner nozzle brick, upper slide, lower slide, and outer nozzle brick. The converter slide is a key component in this technology.