Alkaline magnesium refractories characteristics and application prospects

Basic magnesium refractories play an important role in the industrial field with their unique characteristics. High-temperature stability is one of their distinctive features, which enables them to maintain structural stability in high-temperature environments and is less susceptible to thermal shock and chemical erosion. Secondly, alkaline magnesium refractories have excellent alkali resistance, which makes them have good corrosion resistance in alkaline media and can be widely used in glass kilns, cement kilns and other industrial equipment. With the continuous development of industrial technology and the improvement of performance requirements for high temperature refractories, the application prospect of alkaline magnesium refractories will be broader. In the future, with the increase in demand for high temperature and high refractory materials, alkaline magnesium refractories will be more widely used in iron and steel, non-ferrous metals, building materials and other industries to provide more reliable protection for industrial production.

Preparation process of alkaline magnesium refractory bricks

1、Selection and property analysis of magnesium raw materials

In the preparation of alkaline magnesium refractory bricks, the selection of magnesium raw materials directly affects the quality and performance of the final product. Common magnesium raw materials include lightly burnt magnesium, magnesium carbonate and serpentine. Lightly burnt magnesium is characterized by high purity and uniform particle structure, so it is widely used in the preparation of refractory materials. Its advantage lies in its ability to maintain a stable structure at high temperatures and resist thermal shock and chemical erosion, making it suitable for high-temperature industrial environments. Raw materials such as magnesium carbonate and serpentine are less costly, but relatively contain more impurities and therefore require fine processing and treatment. When selecting magnesium raw materials, factors such as their chemical composition, crystal structure and thermal properties need to be taken into account to ensure that the final product has stable performance and excellent refractory properties.

2、Preparation method of alkaline magnesium refractory bricks

Impregnation method will be magnesium raw materials immersed in a solution containing specific additives, through the adsorption and penetration effect makes the additives uniformly distributed on the surface of the raw material particles, with a dense structure and good performance performance. The preparation process is simple, easy to control, and can form a uniform additive coating on the surface of the brick, improving the refractory brick slag resistance, alkali resistance and other properties. In addition, the impregnation method can also realize the fine regulation of the microstructure and crystal organization of the brick body, which further improves the overall performance of alkaline magnesium refractory bricks. Press molding and sintering process is one of the important methods for preparing alkaline magnesium refractory bricks. In the raw material preparation stage, it is necessary to select suitable magnesium raw materials and add appropriate amounts of binding agent and other auxiliary materials as needed. In the molding process, the mixture is pressed through a mold to form brick blanks of the required size and shape. The key to compression molding is to control the pressure and molding speed to ensure the denseness and uniformity of the brick blanks, thus ensuring the quality of the final product. Once the molding is completed, the brick blanks need to be dried. The purpose of drying is to remove the moisture in the brick to prevent cracks and deformation in the sintering process. The dried bricks are put into the kiln for high temperature sintering. The sintering process is one of the most critical aspects of the entire preparation process, the purpose of which is to make the various components in the brick billet at high temperatures in the chemical reaction, the formation of a stable crystal structure, thus giving the refractory bricks excellent refractory properties.

3、Influence of process parameters on performance

In the process of alkaline magnesium refractory brick preparation, the selection and control of process parameters have an important influence on the performance of the final product. Appropriate sintering temperature can promote the bonding between raw material particles and improve the density and mechanical strength of the brick body. However, too high sintering temperatures may lead to excessive grain growth, which reduces the thermal shock resistance of the brick body. Therefore, the sintering temperature needs to be precisely controlled during the preparation process according to the characteristics and requirements of the specific material to obtain the best brick body performance. An appropriately extended sintering time helps to ensure the homogeneity and stability of the internal structure of the brick body and improve its refractoriness and alkali resistance. However, excessively long sintering time may lead to increased energy consumption and reduced production efficiency, so it is necessary to reasonably control the sintering time under the premise of ensuring product quality to achieve cost-effective production. Appropriate pressing pressure can promote close bonding between raw material particles and improve the density and mechanical strength of the brick body, thus improving its refractoriness and slag resistance.

Research on refractory recycling and resource utilization technology

1、Recycling technology overview of waste refractory bricks recovery and treatment methods

In the recycling process of waste refractory bricks, the commonly used methods include crushing, pulverizing and sorting. The waste refractory bricks are crushed or pulverized by mechanical equipment to decompose them into smaller particles or powders, and the particles are sorted using screening, airflow separation and other methods to separate materials of different particle sizes, and special treatments are also needed for waste refractory bricks containing hazardous substances, such as chemical cleaning, heat treatment, etc., to ensure that the processed material meets the requirements of safety and environmental protection. In the treatment process of waste refractory bricks, the treated waste refractory bricks are used as raw materials for the production of new materials. By adding suitable additives and controlling the process parameters, the waste refractory bricks can be mixed with other raw materials to prepare new refractory materials or construction materials, such as recycled refractory bricks and recycled concrete, which can be used in the fields of construction and metallurgy. Another method is to heat-treat the waste refractory bricks to extract the valuable substances in them, such as iron, aluminum and other metals, or to convert them into alternative raw materials such as fly ash and slag, which can be used for cement production or soil improvement and other purposes. In addition to the above methods, waste refractory bricks can also be considered as filler for roadbed construction, landfill cover, etc., to achieve simple and effective treatment and utilization.

2、Overview of resource utilization technologies

Among the resource utilization technologies, common methods include thermal treatment, chemical treatment and physical treatment. Thermal treatment through high temperature treatment of waste refractory bricks can be converted into alternative raw materials such as fly ash and slag. Chemical treatment can extract valuable metals or compounds in waste refractory bricks through chemical methods, such as iron, aluminum, etc., so as to realize the recycling of resources. Physical treatment through physical methods of waste refractory bricks can realize its recycling. For example, the use of vibrating screen, magnetic separator and other equipment for waste refractory bricks for screening, magnetic separation, etc., can be obtained in different particle sizes and compositions of the material, so as to be used in different areas of utilization.

3、Key technology research and process optimization

Optimization of treatment process of waste refractory brick materials

Optimization of the treatment process of waste refractory brick materials is a key link to realize recycling and resource utilization. First of all, according to the characteristics of the waste refractory bricks and the treatment demand, it is necessary to design a suitable treatment process, including crushing, crushing, screening, magnetic separation and other links, each step needs to be precisely controlled to ensure that the treatment process is highly efficient and environmentally friendly. Secondly, it is necessary to choose suitable processing equipment and process parameters. For example, in the crushing and pulverizing link, crusher and pulverizer suitable for the characteristics of waste refractory bricks should be selected, and suitable parameters such as rotational speed and pressure should be controlled to ensure the uniformity and stability of particle size. At the same time, for the waste refractory bricks containing harmful substances, it is also necessary to take special chemical treatment methods, such as acid and alkali leaching, roasting, etc., to transform or decompose the harmful substances into harmless substances, to ensure that the processed material meets the environmental standards. In addition, the optimization of the treatment process of waste refractory brick materials also includes the simplification of the process flow and the reduction of energy consumption. By optimizing the process flow and reducing the processing steps and energy consumption, the processing efficiency can be improved and the production cost can be reduced.

Discussion of key technologies in recycling process

In the recycling process, the key technologies include the following aspects: ① Efficient recovery and separation technology of waste refractory brick materials. Effective recovery and separation technology can improve the recovery rate of raw materials and reduce the waste of resources. For example, the use of vibrating screen, airflow sorting and other technologies can realize the particle sorting of waste refractory bricks, separating materials with different particle sizes and compositions, and providing diversified raw material choices for subsequent utilization. ② Recycling technology of waste refractory brick materials. Recycling technology is the key to transform waste refractory bricks into new materials or products. For example, through reasonable formula design and process control, waste refractory bricks can be mixed with other raw materials to prepare new refractory materials or construction materials, such as recycled refractory bricks, recycled concrete, etc., for construction, metallurgy and other fields. In addition, heat treatment technology can also be used to convert waste refractory bricks into alternative raw materials such as fly ash and slag, which can be used in cement production or soil improvement and other fields. ③ Environmental protection treatment technology of waste refractory brick materials. In the recycling process, it is necessary to fully consider the requirements of environmental protection and take effective measures to reduce the impact on the environment. For example, efficient waste gas treatment equipment and waste water treatment technology can be used to effectively treat the waste gas, waste water and other pollutants generated during the treatment of waste refractory bricks to ensure that the treatment process meets environmental standards.

Alkaline magnesium refractory brick resource utilization technology research

1、Characterization of waste alkaline magnesium refractory bricks

Discarded basic magnesium refractory bricks are refractory materials that have been eliminated or damaged after use in high temperatures and harsh environments. Discarded basic magnesium refractory bricks have excellent refractory performance, and their main components are magnesium oxide and alkaline oxides, so that they can still maintain a stable structure and performance at high temperatures. The chemical composition of waste basic magnesian refractory bricks is relatively complex, and may contain various elements such as magnesium oxide, calcium oxide, iron oxide, etc. The content and proportion of these components have an impact on their performance. Waste alkaline magnesium refractory bricks may be affected by the use of environmental and technological conditions and the occurrence of burnout, thermal shock cracks and so on, resulting in a decline in their performance. An in-depth understanding of the characteristics of its chemical composition, crystal structure and microstructure will help to select appropriate treatment methods and utilization paths, maximizing the reuse of resources and environmental protection.

2、Exploration of ways to utilize resources

Utilizing waste refractory brick materials to regenerate and prepare new materials

The use of waste refractory bricks to regenerate the preparation of new materials through a reasonable process and formula design, the waste refractory bricks mixed with other suitable raw materials, through the molding, sintering and other technological steps, the preparation of new materials with certain properties and uses. In the process of regeneration and preparation of new materials, it is necessary to consider the characteristics and performance of the waste refractory bricks, as well as the requirements of the target products. According to the chemical composition, crystal structure, pore structure and other characteristics of the waste refractory bricks, select the appropriate raw material ratio and process parameters to ensure that the final product has good performance and stable quality. Through mixing, stirring and other process steps, the waste refractory bricks and other raw materials are fully mixed to form a homogeneous slurry or mixture. In the mixing process, additives or modifiers can be added appropriately to adjust the ratio of raw materials to improve the mixing performance and product performance. The mixture will be molded, commonly used molding methods include extrusion molding, compression molding, injection molding and so on. Through the molding process, the mixture will be molded into the required shape and size, in preparation for the subsequent sintering process. The molded product will be sintered. The sintering process is a key step in the whole preparation process, through high temperature sintering can make the particles in the raw material combined into a whole, forming a strong new material. In the sintering process, it is necessary to control the sintering temperature and maintain a suitable holding time to ensure that the structure and properties of the product are well guaranteed.

3、Process optimization and performance improvement

Process parameter optimization and control strategy

In the process of resource utilization of waste alkaline magnesium refractory bricks to prepare new materials, the optimization and control strategy of process parameters are crucial. According to the nature and requirements of raw materials, the process parameters are reasonably selected and controlled. The use of automated control system and online monitoring equipment can monitor and adjust the process parameters in real time to ensure the stability and consistency of product quality.