kiln lining Archives - Global Refractory Brick Supplier & Factory-Rongsheng

· [Abstract] Rotary kiln production and operation requires the use of refractory bricks as kiln lining, and low cement castables are commonly used as linings in the settling chamber. The lining treatment of the cone section depends on the situation. If the discharge opening is too small, no lining is required, otherwise low-cement castables are used and steel fibers are added to improve durability.

Zinc volatilization kilns all use rotary kilns for production and operation. The refractory bricks used for the kiln lining of the rotary kiln need to be made of consistent materials and accurate in size. Only then can the kiln body operate normally and the service life be extended.

Refractory Materials for the Settling Chamber

However, the kiln tail smoke chamber, which is the settlement chamber, is lined with clay bricks or low-cement refractory castables. Generally speaking, more low-cement castables are used, while clay bricks are rarely used as linings. The shape of the settling chamber is a cone, with the upper part larger and the lower part smaller, which facilitates the smooth discharge of smoke and dust. Because if this part is designed to be small, or the design of the unloading port is unreasonable, if it is too small, this part will be slapped during daily work to speed up the exhaust of smoke and dust.

At present, according to the situation of the manufacturers, some manufacturers basically do not do any lining treatment on the lower cone section of the settling chamber. The reason is that this area is often patted, and even the lining is patted off. It does nothing, but wastes the castables used and increases costs.

So, should this part be lined with cement refractory castables or bricks? In principle, it is still needed. Low cement castables are used as linings. If steel fibers are added to the castables in the cone section to increase the tensile effect, it will still have a certain effect. And if the discharge opening of the cone section is indeed too small, the use of low-cement castables as lining is indeed not very effective.

In short, whether this part is constructed with low cement castables or nothing is used depends entirely on the working conditions on-site. If the opening of the cone section is too small, there is no need for lining. If the unloading opening is of reasonable size, it is better to use low cement castable to cast the lining.

Rongsheng Refractory Materials Manufacturer has more than ten years of production and sales experience. It has its own unique insights into the design of refractory lining materials, thermal insulation, energy saving, and consumption reduction. We are committed to providing refractory lining solutions to extend the service life of refractory linings, thereby helping companies save production costs. We also have rich experience in various rotary kiln cases. Contact us for more solutions.

The kiln lining needs to be repaired after wear and tear. According to the wear of the kiln, choose the appropriate repair method. Plastic refractory materials repair, spray refractory materials repair and castable refractory repair can be used.

Refractory is the basic material of high-temperature technology and an important masonry material for kiln lining. In a high-temperature environment, it is in direct contact with slag, charge, decomposition gas, etc., and gradually changes during long-term use. The characteristics of the refractory itself can resist the erosion of slag, chemical, air flow, etc. for a certain period of time. However, over a certain period of time will cause local lining damage, peeling, and other phenomena. At this point, the refractory material needs to be repaired. The refractory material can continue to work through a series of repair operations to ensure the normal operation of the kiln. So, what methods can be used to repair the refractory lining of the kiln?

Converter repair material

Repairing damaged parts of the converter can significantly extend the service life of the converter. With the advancement of spraying technology, converter thermal spraying technology has experienced the direction from high water to low water and no water, that is, from wet and semi-dry to flame spraying.

Blast furnace gunning

The spray method uses high-pressure air to transport granular refractory materials. Mix with a suitable amount of water in a spray gun and spray on the surface of the repair lining. Attached to a certain thickness (up to several hundred millimeters), replacing the rebuilding of the refractory brick lining.

Repair method of the inner lining of the mixed iron car

Due to its function and operation characteristics, the maintenance of the inner lining of the mixed-rail car is generally divided into major repairs, medium repairs and hot repairs.

Hot blast furnace lining thermal repair technology

As the auxiliary equipment of blast furnace, hot blast stove needs 1-2 generations of blast furnace age. The actual service life of a blast stove is usually determined by the refractory lining of the blast stove system. Refractory linings often have problems during use, and online thermal repair of refractory linings is an effective method to prolong the service life of refractory materials.

Glass Furnace Hot Repair

The traditional furnace thermal repair method has a harsh environment and high labor intensity. Although a great improvement has been made with the use of advanced refractory materials, it is still relatively difficult and burdensome, interfering with normal production. At present, the furnace thermal repair method includes thermal repair methods and thermal oxygen spraying methods.

What are the repair methods for boiler refractory repair?

The pouring repair method is to pour the unshaped refractory material into the repaired part and combine it with the original lining to resist the erosion of the slag.
The thermal spraying repair method is to spray the unshaped refractory material to the part that needs to be repaired through the spray gun. And attached to its surface to reach a certain thickness, replacing the rebuilding refractory brick lining. Rebuild the residual brick lining or the furnace lining on the surface of the furnace shell to restore the furnace shape. Compared with other maintenance methods, the major feature of spray repair is that the integrity of the repaired furnace lining is good, and the furnace shape can be reconstructed.
The injection method is to project the unshaped refractory material to the part that needs to be repaired. The operation is simple and convenient.
The grouting repair method is also known as the press-in repair method. It uses special press-in equipment to transport specific refractory materials from outside the furnace to designated maintenance parts under certain pressure conditions. So as to achieve the purpose of filling the gap and repairing the furnace lining.
The digging method is also known as the masonry method, that is, the partially damaged part of the lining is removed first, and then the refractory tiles are used to rebuild the masonry. In this case, the kiln needs to be cooled before construction.

Different lining refractory repair methods are suitable for different furnaces.

The pouring repair method can be used for repairing any kiln, blast furnace, coke oven, electric furnace, iron tapping point, ladle, etc. after the furnace is stopped.
Thermal spray repair, which can be used for damage repair of the bottom furnace wall of hot blast furnace, coke oven head, open-hearth, electric furnace, converter, heating furnace, and other furnace linings.
Spray repair method, mostly used for ladle lining construction.
The grouting repair method is mostly used for filling between the blast furnace and the furnace wall.
Excavation repair method, suitable for medium or overhaul of various kilns, blast furnaces, coke ovens, ladle, tundish, etc.

The above is an introduction to the repair method of lining refractory materials. With the development of the refractory industry, the repair methods of refractories have gradually changed. As a refractory manufacturer, Rongsheng Global Refractories has always aimed at kiln refractory solutions, boiler refractory repair, providing users with better refractory materials, and optimizing refractory lining material repair solutions.