The production process and main technical measures of fused magnesia

The rapid development of the iron and steel industry has higher and higher requirements for the quality and performance of refractory materials. Magnesia-carbon bricks with excellent performance have been widely used in industrial production, and fused magnesia is accompanied by the development of magnesia-carbon brick production technology. and developed rapidly. The magnesia obtained by electric melting has larger grain size, higher purity and density, so it can meet the requirements of high-quality magnesia-carbon brick production. Fused magnesia has the advantages of high purity, large crystal grains, compact structure, strong slag resistance, and good thermal shock stability. At the same time, the main crystal phase is periclase, with coarse grains and direct contact. , magnesia-carbon bricks and the preparation of various unshaped refractory materials, and can also be used as high-temperature electrical insulating materials in electrical components.

 The production process of fused magnesia:

 In specific industrial production, the raw materials of fused magnesia of different specifications are also different. Ordinary fused magnesia usually directly uses magnesite as raw material, while large crystal fused magnesia uses light burned magnesia as raw material, and the equipment adopts Submerged arc furnaces mostly use three recycled or non-regenerated graphites. The specific process is: feeding → ignition and lifting electrode → gradual feeding → smelting (magnesite is sintered and melted by the heat generated by high current) → natural cooling → crushing, classification and sorting → storage. The production status of fused magnesia with the fused temperature above 2750℃:

 The production of fused magnesia consumes a lot of electric energy, and the comprehensive energy consumption per unit product is nearly 5-10 times that of similar products of sintered magnesia. It is an industry that restricts development in my country's energy policy. At present, the overall smelting level of fused magnesia in my country is relatively low, the equipment is simple, the operation is mainly manual control, the thermal system and operating procedures are imperfect, energy waste and environmental pollution are serious, and strategic upgrading is urgently needed. Therefore, it is necessary to analyze and study the thermal process and energy balance of fused magnesia production, and find effective measures to save energy, improve the comprehensive utilization rate of raw materials, and control smoke and dust. Fused magnesia chrome sand. Fused chrome sand. Fused aluminum chrome sand

 The main technical measures are:

 (1) Research and develop comprehensive energy-saving technologies: 1. Improve the power of electric furnaces, phase out low-power electric furnaces, and use electric furnaces of 1600KVA or more, or even 3500KVA or 5000KVA; 2. Develop new energy-saving electric furnaces, supplemented by intelligent function control, to achieve energy-saving power supply Objective; three, optimize and improve the production process and parameters.

 (2) Soot control and waste heat recovery.

 (3) Development and production of new electrofusion synthetic sand.