The raw materials for producing low-carbon ferromanganese include manganese-silicon alloy, manganese ore, lime and fluorite, etc. The raw materials used in the oxygen blowing decarburization method are mainly high-carbon ferromanganese. In order to produce low-carbon ferromanganese that meets the standard requirements and achieve good technical and economic indicators, all raw materials must meet certain quality requirements. The main production methods of low-carbon ferromanganese are electric silicothermal method, shaking furnace production method, oxygen blowing production method, Pollan method and Udacon converter method. Raw material requirements: manganese-manganese alloy production of medium and low-carbon ferromanganese based on electrosilicon heating method and shaking furnace method requires the use of manganese-silicon alloy; manganese ore, low-carbon ferromanganese production requires manganese ore High, the phosphorus-manganese ratio should be low, and the silica content should be low; lime, the lime for smelting low-carbon ferromanganese requires that the calcium oxide content should be greater than 85%, the particle size of the furnace should be 10-60mm, and the particle size content should be above 80%.
The induction furnace for the production of low-carbon ferromanganese is the induction heating equipment with the highest heating efficiency and the fastest speed for metal materials, low consumption, energy saving and environmental protection. The high-frequency high-frequency large current flows to the heating coil wound into a ring or other shape . As a result, a strong magnetic flux with instantaneous polarity changes is generated in the coil. When a heated object such as a metal is placed in the coil, the magnetic flux will penetrate the entire heated object. In the opposite direction of the heating current inside the heated object, a The corresponding large eddy current. Due to the resistance in the object to be heated, a lot of Joule heat will be generated, and the temperature of the object itself will rise rapidly, achieving the purpose of heating all metal materials.
The process of producing low-carbon ferromanganese by using an induction furnace includes the following steps: adding the raw material manganese-silicon alloy and manganese ore into the induction furnace, energizing the induction furnace, heating the induction furnace, and dissolving the manganese-silicon alloy and manganese ore in the induction furnace Carry out the melting operation; after the melting is completed, add lime into the induction furnace according to the amount of manganese-silicon alloy and manganese ore in the induction furnace, adjust the slag alkalinity in the induction furnace to 1.4-1.6, and continue heating and refining in the induction furnace. The power of the electric furnace is 1500-6000 kVA electric furnace; after the refining is completed, the slag on the surface is poured out; after the sampling test is qualified, the alloy in the induction electric furnace is poured to obtain the finished product.
As an improvement, the temperature of the induction furnace is between 1400°C and 1700°C.
As an improvement, the manganese content in the produced low-carbon ferromanganese is 72-95%, and the iron content is between 5-25%.
As an improvement, the production of low-carbon ferromanganese and carbon is 0.2-0.7%.
Induction electric furnace is the induction heating equipment with the highest heating efficiency and the fastest speed for metal materials, low consumption, energy saving and environmental protection, and the production cost is greatly reduced. The induction furnace converts electrical energy into thermal energy through electromagnetic induction, heats, melts and heats up the material. The material formed by the molten material is strongly stirred by the electromagnetic force, the material melts quickly, and the alloy elements burn less. Strong stirring is also conducive to deoxidation, degassing, and removal of inclusions, etc. The material has high purity, and the chemical composition is easy to adjust and control. The process can make slag to cover the molten iron, which can prevent the oxidation of silicon, manganese and alloy elements in the molten iron to a certain extent, and reduce the absorption of gas from the furnace gas by the molten iron, so that the molten iron is relatively pure. The precise control of temperature improves the quality and qualified rate of low carbon ferromanganese.
The low-carbon ferromanganese production process specifically includes the following steps:
Add the raw materials manganese-silicon alloy and manganese ore required for the production of low-carbon ferromanganese into the induction furnace, and the induction furnace is energized to heat the raw material manganese-silicon alloy and manganese ore in the induction furnace for melting operation. The induction furnace is in the process of heating The medium temperature is controlled between 1400°C and 1700°C, and the power of the induction furnace is 1500-6000 kVA. The induction furnace melts the manganese-silicon alloy and manganese ore inside; Add a certain amount of lime to the induction furnace with the amount of manganese ore, and the ratio is controlled between 1:0.5-1:2. The lime put into the induction furnace will adjust the alkalinity of the melted manganese-silicon alloy and manganese ore in the induction furnace From 1.4 to 1.6, the induction furnace continues to heat and refine; the refining time is about 10 minutes. After the refining is completed, the slag on the surface of the induction furnace is poured out mechanically; samples are taken from the smelted alloy for testing, and after passing the test The alloy in the induction electric furnace is poured to obtain the finished product. The manganese content in the finished low-carbon ferromanganese is 72-95%, the iron content is between 5-25%, and the carbon content should be 0.2-0.7%.
When it is working, the advantage of induction electric furnace smelting is that there will be no carburization and sulfuration during the smelting process of low-carbon ferromanganese, and the smelting process can cover the molten iron with slag, which can prevent silicon and manganese in the molten iron to a certain extent. And the oxidation of alloying elements, and reduce the molten iron to absorb gas from the furnace gas, so that the molten iron is relatively pure. Induction electric furnace has fast heating speed, high production efficiency, less oxidation and decarburization, and saves material and forging die costs. This heating method heats evenly, and the temperature difference between the core and the surface is extremely small, so it also greatly increases the life of the forging die in forging. The roughness of the surface is also less than 50um; the heating is uniform, the temperature difference between the core and the surface is extremely small, and the temperature control accuracy is high. It meets the requirements of various indicators of the environmental protection department. Induction heating is the most energy-saving heating method in electric heating furnaces. The power consumption per ton of forgings heated from room temperature to 1100 ° C is less than 360 degrees; the heating is uniform, the temperature difference between the core and the surface is extremely small, and the temperature control accuracy is high. , Induction heating, the heat is generated in the workpiece itself, so the heating is uniform, and the temperature difference between the core and the surface is extremely small. The application of the temperature control system can realize the precise control of the temperature and improve the product quality and pass rate.
Induction electric furnace is the induction heating equipment with the highest heating efficiency and the fastest speed for metal materials, low consumption, energy saving and environmental protection, and the production cost is greatly reduced. The induction furnace converts electrical energy into thermal energy through electromagnetic induction, heats, melts and heats up the material. The material formed by the molten material is strongly stirred by the electromagnetic force, the material melts quickly, and the alloy elements burn less. Strong stirring is also beneficial to deoxidation, degassing, removal of inclusions, etc. The purity of the material is high, and the chemical composition of low-carbon ferromanganese is easy to adjust and control the uniformity of the composition.
The process of producing low-carbon ferromanganese by using an induction furnace includes the following steps: adding the raw material manganese-silicon alloy and manganese ore into the induction furnace, energizing the induction furnace, heating the induction furnace, and dissolving the manganese-silicon alloy and manganese ore in the induction furnace Melting operation; induction furnace is the induction heating equipment with the highest heating efficiency and the fastest speed for metal materials, low consumption, energy saving and environmental protection, the production cost is greatly reduced, and the temperature during work can be achieved by adjusting and controlling the power supply time and power. It is convenient to adjust and control. The induction furnace converts electric energy into heat energy through electromagnetic induction. The material formed by the melted material is strongly stirred by the electromagnetic force. The material melts quickly, the alloy elements burn less, and strong stirring is also beneficial. Deoxidation, degassing, removal of inclusions, etc., high material purity, easy adjustment and control of low-carbon ferromanganese chemical composition and good composition uniformity. Easy to adjust and control composition uniformity.