The use of nickel oxide ore to smelt ferronickel in a submerged electric furnace with an electric carbon process has a long history abroad. Although the distribution of ferronickel smelting in the world is not very wide, there are many smelting processes. Even if the same process is used, the operation will be different due to the different composition of nickel ore and the requirement of Ni content in the product, and the required electric furnace parameters will also be different. Variety. There is a shortage of domestic nickel oxide ore, almost all of which is imported. The chemical physics fluctuates greatly and is unstable. Except for individual manufacturers that have conducted industrial trial production, there are no domestic companies that smelt ferronickel in submerged arc furnaces with nickel oxide ore, because nickel, copper, and cobalt were originally non-ferrous metal smelting. There is no smelting method using nickel oxide ore submerged arc furnace in China. In the domestic submerged electric furnace smelted with silico-manganese alloy, high-carbon ferrochromium or ferrosilicon, the nickel ore is sintered first, and the smelting is directly converted to more. Subsequently, some companies directly use the RKEF process to produce ferronickel. Therefore, the relevant departments smelt ferronickel within the scope of ferroalloy smelting.
Using the RKEF process, its supporting submerged electric furnace is also pre-reduced calcine into the furnace, and the submerged electric furnace is designed with selective reduction operating conditions. At present, most domestic ferronickel manufacturers use full reduction operations to produce low-nickel products. From the conductivity of the material layer during the smelting process, the slag-to-iron ratio changes, the design parameters of the submerged electric furnace, and the selection of the structure will change.
To this end, we made the above detailed comparative analysis from the perspective of the design of the submerged electric furnace, the selection of the parameters of the electric furnace by the different operations of ferronickel smelting, and the influence of the slag on the service life of the furnace lining.
The purpose is, in the design of ferronickel electric furnace, based on the actual conditions of each plant, the design is low in investment and high in practical value, which can not only meet the needs of smelting, but also facilitate the operation and maintenance of the mineral heat.
Rotary furnace nickel ore roasting process and sintering machine nickel ore sintering process have their own strengths in the entire smelting process, operating costs, indicators of electricity consumption and output, and the operation stability of the smelting process, and the use of furnace lining. How to learn from each other’s strengths? What should be done now.
Using electric carbon thermal method and submerged electric furnace to smelt ferronickel, the conditions of each plant are different. In actual work, it is impossible to have a more detailed understanding of the specific conditions of each plant in order to make a more accurate comparison and analysis.
The electric carbon used in the nickel-iron submerged arc furnace is sintered with high-standard sealed paste. As the heart of the submerged arc furnace, the electrode plays a vital role in the ferronickel smelting. The quality of the airtight paste directly affects the operating conditions of the ferronickel submerged arc furnace. Rongxin Carbon’s high-standard airtight paste occupies more than 60% of the Inner Mongolia nickel-iron submerged arc furnace market and is an important domestic supplier of nickel-iron submerged arc furnace electrode paste.
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