Feasibility of the process of producing wear-resistant plate by electrosilicothermal method
In recent years, China has imported a large number of laterite nickel ore to produce nickel-iron alloy to replace some metal nickel and solve the problem of nickel resource shortage. The nickel-iron products used in the smelting of wear-resistant plates require low silicon and phosphorus mass fraction, on the one hand, to reduce the dephosphorization burden in the smelting process of wear-resistant plates, on the other hand, because the high silicon mass fraction is not conducive to the oxidation and dephosphorization of nickel-iron alloy itself and stainless steel mother liquor. However, due to the characteristics of high silica mass fraction of laterite ore, the process operation of producing nickel-iron products to meet the requirements of wear-resistant plate smelting is complicated, and the amount of slag is large.
According to the characteristics of high silica content in low-grade laterite nickel ore, the process is used to produce high-silicon nickel iron by mineral furnace, and then the chromium and iron in the chromium powder ore are reduced by the silicon of high-silicon nickel iron, and the mother liquid of nickel-chromium wear-resistant plate is obtained, and then transferred to AOD or VOD refining process after composition and temperature adjustment to produce wear-resistant plate.
Therefore, the process not only helps to solve the technical problem of producing low silicon ferric nickel from laterite ore, but also can directly use chromium concentrate powder. The material and energy balance calculation results show that compared with the traditional "two-step" process, the new process can reduce the raw material cost by 6.3% ~ 7.2%, reduce the comprehensive energy consumption by about 7.1%, and reduce the CO2 emission by about 6.1%. The bench test results show that the phosphorus mass fraction of high silicon nickel iron with silicon mass fraction of about 20% can be reduced to less than 0.03%, which can meet the design requirements of the new process. After dephosphorization, the high silicon ferric nickel is desilicated and chromed, and finally the nickel-chromium stainless steel base material with the mass fraction of phosphorus, silicon and carbon meets the requirements of the initial steelmaking water of wear-resistant plate can be obtained.
