1. Accurate operation: according to the characteristics of one-step production, it is required to be refined and accurate in the electric furnace smelting operation process; The addition of the charge must be strictly in accordance with the prescribed amount and procedure, and the smelting time of the electric furnace and the load of power transmission must be strictly in accordance with the prescribed amount.
2. Shaking operation: Shaking operation is the most important link in the one-step production cycle, and the operation of this link directly affects the smoothness of the subsequent links. When shaking operation, the addition of ferrosilicon should be strictly carried out in accordance with the prescribed amount and procedure, the speed of the shaking furnace is controlled at 55-60r/min, and the shaking time is controlled at about 10-15 minutes.
3. Furnace size requirements: the diameter and depth of the furnace have a greater impact on the shaking, and the ratio of depth to diameter should be about 0.8.
4. Refining desiliconization control: Desiliconization is the main process of refining, when the silicon in the alloy is reduced to 1%, the smelting is over; When refining and desiliconization, we should grasp several links: first, control the appropriate slag manganese; The second is to control the appropriate alkalinity; The third is to expand the reaction contact surface appropriately.
5. Slag basicity control: The lining material of one-step smelting of low-micro-carbon ferro manganese is preferably magnesian material, which is alkaline material, so the basicity of the slag liquid must always be kept greater than 1 in the process of one-step smelting of low-carbon ferro manganese.
Iron, slag outlet maintenance: iron, slag outlet is the weakest place in the furnace lining, using tar mud ball protection, blocking iron, slag outlet, can effectively maintain iron, slag outlet.
Safety and environmental protection: safety and environmental protection is the guarantee of production, the main measures to ensure safety are: first, to ensure that the dry material into the furnace, the water content of the charge shall not be greater than 3%; The second is to ensure that the furnace body around dry, no water or damp, the third is to build the furnace to build a circle of safety and leak-proof permanent layer to ensure that the hot metal will not penetrate the furnace. In terms of environmental protection, it is preferable to install a cloth bag dust collector of 15,000 cubic meters to collect flue gas and dust in the smelting process.
The method of smelting low-carbon ferro manganese is characterized by concentrating the three steps of traditional process slag, shaking furnace smelting and electric furnace refining in one furnace to complete, slag smelting, shaking furnace smelting and electric furnace refining. These three processes are mature to do separately, and the three processes together have become a new process, the three processes together to form a mutual connection, mutual influence, mutual restriction relationship, is a new set of production process control methods. It has the characteristics of low energy consumption, low carbon ferro manganese main element recovery rate, high effective element utilization rate, low product impurity content, is the innovation of traditional technology, is the technical upgrade of traditional industry, worthy of affirmation and promotion.
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