Microporous carbon bricks, ultra-microporous carbon bricks, and graphite bricks are refractory materials commonly used in blast furnace hearths and bottoms, which play an important role in prolonging the service life of blast furnaces. However, there are certain defects and deficiencies in the ceramic cup combined with carbon brick. In order to ensure the performance stability of carbon bricks for blast furnaces, the preparation process of titanium-based composite carbon bricks was analyzed. To clarify the amount of various refractory materials added, the composite carbon brick can have better corrosion resistance.
Characteristics of traditional graphite carbon bricks
Graphite carbon brick company’s impregnated graphite carbon plate and graphite carbon brick have the following characteristics.
- Excellent chemical stability, erosion resistance, wear resistance, and low porosity. Has excellent corrosion resistance.
- Its own quality and volume are constant, heat conduction, and temperature resistance. It will not burst and break due to drastic changes in temperature.
- During construction, the medium will not be polluted and will not be covered by impurities. It is easy to clean, and the heat transfer effect will not be reduced after long-term use. Excellent curing process, especially suitable for equipment anti-corrosion in strong corrosive media.
- Small thermal expansion coefficient and low linear change rate. Used within the range of 180 degrees, its performance is stable and durable.
- The overall size can fully meet the requirements of construction masonry technology. The size of graphite carbon bricks can be customized according to the actual needs of customers. All special-shaped graphite carbon bricks based on 230*113*65, such as thick and wide models, arched corner bricks, fan-shaped bricks, etc., are produced according to the requirements of the user’s drawings.
Impregnated graphite carbon plate, graphite carbon brick. RS refractory brick manufacturers (https://rsrefractoryfirebrick.com/) can provide a variety of high-quality graphite carbon brick products. Anti-corrosion carbon bricks, carbon plates, impregnated graphite carbon bricks, carbon plates, anti-corrosion carbon bricks, high-temperature resistance, and anti-corrosion carbon plate carbon bricks can all be customized.
Types and composition analysis of titanium-containing materials in composite carbon bricks for blast furnace longevity
Blast furnace longevity has always been the focus of research in the metallurgical industry. Under normal circumstances, the temperature of the side wall and furnace bottom of the blast furnace will show abnormal fluctuations when the smelting intensity gradually increases. It affects the service life of blast furnaces to a great extent. By adding a certain proportion of titanium-containing compounds into the blast furnace, the stable operation of the blast furnace can be guaranteed. The commonly used titanium-containing materials include FeO, SiO2, TFe, TiO2, etc. The types of materials include sinter, pellets, cold consolidated pellets, etc. The performance studies of these materials are representative to a certain extent, and the origin of the materials is different, so there are certain differences in the fluctuation range of the average mass fraction. Among them, the average value of TFe mass fraction fluctuates widely, within the range of 30.58%-61.00%. In order to meet the requirements for the preparation of titanium-based composite carbon bricks for test blast furnaces, it is necessary to select titanium-containing materials with stable iron-containing grades and good economical efficiency.
Preparation Technology of High-Performance Composite Carbon Brick for Blast Furnace
Determination of the additive ratio
For the preparation process test of titanium-based composite carbon bricks for blast furnaces, titanium compounds, silicon powder, silicon carbide, and white corundum are selected as additives, and three levels of each additive are selected for orthogonal experiments. Through the analysis of laboratory test results, various performance indicators of titanium-based composite carbon bricks are clarified. At the same time, through laboratory tests, the optimal ratio of additives is correspondingly expanded, and various sample numbers are marked to determine the ratio of additives. Then pass the performance index test to ensure the scientificity and authenticity of the test results.
Addition of additives to the paste
Through further experiments, it was found that using the original carbon brick preparation method, the micro powder grade materials would agglomerate after kneading, and the proportion of various additives was large, which was not conducive to the formation of material balls with stable performance. After certain adjustments are made in the way of adding additives to the paste, the following two test methods are summarized. First, adopt the method of encapsulation and pre-dispersion, first add various additives to the asphalt and thinner mixed in a certain proportion. This method can effectively improve the specific surface area of the additive and ensure the dispersion uniformity of the carbon brick paste to the greatest extent. Second, mix and knead high-quality coal powder and additives according to the optimal ratio determined by experiments. After the raw material is formed, the blank is roasted by high-temperature heat treatment. The dried blank is then pulverized to form a finer powder. This method can effectively reduce the thermal expansion of white corundum and titanium compounds during high-temperature heat treatment, and better solve the problem of uneven dispersion of additives in the paste. Fundamentally avoid many defects in the performance of products after high-temperature heat treatment, and ensure the excellence of various performance indicators.
Carbon brick-forming process
Titanium-based composite carbon bricks for blast furnaces are mainly formed by vibration. Through repeated testing of parameters such as vibration time, amplitude, frequency, feeding method, test vacuum degree, and excitation force. Defining the best process for preparing titanium-based composite carbon bricks fundamentally ensures the uniformity of the internal structure of the carbon bricks. At the same time, attention should also be paid to the temperature setting during high-temperature treatment, and the roasting curve can be used to clarify the process parameters suitable for the preparation of titanium-based composite carbon bricks. In order to ensure that the performance indicators of the carbon brick meet the expected assumptions.
Advantages and characteristics of titanium-based composite carbon bricks for blast furnaces
Through the analysis of previous studies, the high thermal conductivity of the carbon brick structure can be fully utilized, and a cooling system with a high level of performance can be obtained. However, the corrosion resistance of molten iron is poor. The corrosion resistance of the ceramic cup structure can separate the molten iron from the carbon brick. But the cooling effect exerted is low. The titanium-based composite carbon bricks developed and prepared, taking into account the advantages of carbon bricks and ceramic cups, are of great significance for prolonging the life of blast furnaces.
To purchase high-quality carbon bricks for blast furnaces, please contact RS refractory brick manufacturers. We provide free samples and quotations.
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