Reduction Of Low Carbon Ferrochrome By Microwave Heat Reduction Of Microwave

Ferrochromium is one of the most important alloying material used in the production of stainless and high-alloy ferritic steels. At present, there are two processes to produce low-carbon ferrochrome, that is, the converter furnace smelting process and the electro-silicothermic process, however, the former has a main disadvantage like high energy consumption of 1800℃～2000℃ and the precision control of the temperature; especially, the electrode in the latter process is easy to increase carbon to alloy and hard to control. Therefore, it is necessary to find a new efficient method to produce low-carbon ferrochrome.Comprehensive analysis in this paper, the standard of low carbon ferrochrome smelting technology both at home and abroad, this paper discusses the microwave as a new type of heating mode, its marked characteristics is the metallurgical powder can be selective rapid heating. With traditional particle and particle energy transfer between the heating mode is different, the heating mechanism is to microwave electromagnetic energyo into heat energy, depends on the dielectric loss of materials in the microwave field and the thermal effect, very clean, environmental protection(1)The raw material was tested by South African ferrochrome which contain silicon with power 1.5kW heating by microwave in the microwave casing.(2)The tests mainly to explore the smelting temperature from which from 1100℃ to 1350℃, depending on the reduction products by its macroscopic phenomena can be concluded that temperature at 1300℃ and hold 40min is bette.(3)The software of Factsage was used to simulate SiO2-CaO-Cr2O3 ternary slag and SiO2-CaO binary slag, also to correction the slag basicity depend on itself SiO2-CaO-Al2O3-MgO quaternary slag, from the dates can be concluded that out-feeding temperature should be controlled at 1450℃ and basicity should be controlled at 1.60-1.80.(4)The paper was explorationed from metallic phase macro morphology it is concluded that when the temperature is 1100℃ Cr-Fe alloy nucleation; When the temperature is 1200℃ grew up the parent nucleus; When temperature is 1300℃ ferrochrome basic end can grow up, the formation of granular chromium iron reduction product can completely and slag phase separation.(5)According to metallographic analysis, it is concluded that the ferrochrome metallic element Cr, Fe and nonmetallic elements C, Si in the alloy internal crystal and the distribution of the grain boundary.Generally, this artical system to study the microwave heating in the field reducing smelting, which can deal with more powder ore in the future, also can provide a new method of low energy consumption.