All the details about the installation, cleaning and maintenance of refractories in industry.

Both the selection and care of refractory materials are fundamental aspects in the construction and maintenance of industrial furnaces, influencing their efficiency and durability.

On the one hand, the correct selection of refractory materials guarantees optimal resistance to heat and corrosion, while periodic cleaning helps prevent blockages and guarantees optimal and safe operation. Thanks to this, we can extend its useful life and reduce repair costs.

The importance of choosing the right refractory materials

Refractory materials are those capable of withstanding high temperatures without significant deformation or damage. They are essential for the furnace to maintain its structural integrity and thermal efficiency during operation.

The choice will depend on various factors, such as the working temperature of the oven, the chemical corrosion to which it will be exposed and the thermal load to which it will be subjected. Additionally, the shape and size of refractory materials can also vary depending on the specific needs of the application. 

Below, Anzeve explains the most common refractory materials available, each with its own specific characteristics and applications.

Clays

Refractory clay is one of the most common materials in the construction and repair of industrial furnaces. Known for its ability to withstand high temperatures and its heat resistance. 

Concrete 

Concrete is another very common refractory material used in the construction of industrial furnaces. Composed of refractory cement and refractory aggregates, it offers high resistance to heat and abrasion. It is ideal for applications requiring greater mechanical strength.

Bricks 

They are made from refractory materials such as clay, chamotte and silica, and are designed to withstand high temperatures without damage. We can find them in a wide variety of shapes and sizes to suit different applications.

How is the installation of refractory materials carried out?

To ensure the performance and durability of the industrial furnace, it is essential that the refractory materials are installed correctly. Below, we explain the steps to follow:

1. Surface Preparation

The first thing to do is prepare the oven surface properly, which involves cleaning it, removing any residue or slag, and applying a protective coating.

2. Selection of installation method

There are several methods for installing refractory materials, including pouring, bricklaying (which is usually the most common, and for which specific trusses are used to facilitate the work and reduce construction time), and surface lining. The choice will depend on the type of refractory material used and the characteristics of the kiln.

3. Application of refractory mortar

Refractory mortar is used to bond refractory materials and create a solid, heat-resistant surface. To ensure proper installation, when applying it, it is important to follow the manufacturer's instructions.

Ladle cleaning and nozzle removal

The cleaning of ladles and the elimination of nozzles are also fundamental processes in metal smelting, requiring special care to maintain efficiency and safety during the work carried out in the industrial furnace.

Slag in industrial furnaces

Slag is a common byproduct of metal smelting that can accumulate inside the industrial furnace, clogging air ducts and reducing furnace efficiency. 

Therefore, it is very important to carry out regular cleaning to remove buildup and ensure optimal oven performance. This cleaning is often done even when the oven is not completely cold, as the aim is to minimize downtime.

They are complex jobs in which the use of compact and powerful equipment for demolition of slag is essential. Nowadays, the use of radio-controlled robots has allowed these jobs to be carried out much faster, more efficiently and safely for the operator.

Spoon cleaning

Cleaning ladles is an essential process to prevent contamination of the molten metal and ensure the quality of the final product. This requires removing residues and slag from the used ladles. Using highly precise equipment for this cleaning is crucial to extending their lifespan.

Buoy removal

Tongues are deposits of molten metal that solidify in the ducts and channels of an industrial furnace, potentially obstructing the flow of molten metal and causing damage to the furnace. Therefore, to remove tongues and prevent operational problems, it is important to perform regular cleaning using equipment specifically designed for this purpose.

Refractory maintenance

Regular maintenance of refractory materials is also essential to ensure optimal operation of the industrial furnace and extend its lifespan. Therefore, it is advisable to carry out periodic inspections to detect any signs of damage or wear to the materials, such as cracks, fissures, or material detachment.

This work can be dangerous, since it often requires entering the furnace with the consequent danger of slag collapsing that exists. To carry out these inspections, inspection cages are usually used that allow safe entry into the furnace, as they withstand falling materials and protect the operators who enter to evaluate the condition of the furnace.

If damage is detected, it is important to carry out the necessary repairs as soon as possible, which may involve applying refractory mortar, replacing damaged bricks or repairing cracks.

In short, in order to guarantee optimal operation of the furnace, the installation, cleaning and proper maintenance of refractory materials is essential in both construction and repair tasks. 

Contact us! As an official distributor of refractory treatment brands, Anzeve offers comprehensive solutions for the cement and foundry industries, from material extraction systems to demolition and descaling machinery. This allows for the optimization of industrial furnace performance, guaranteeing their durability and efficiency in the production of cast iron and cement.