A method for slag desulfurization and dephosphorization in conjunction with ferrite recovery in the three-removal process
A recovery method and process technology, applied in the field of slag desulfurization and dephosphorization synergistic ferrite recovery, can solve the problem of high investment cost, no comprehensive treatment method for all three desulfurization of slag desulfurization, dephosphorization and iron reduction and recovery, and low Fe recovery rate. Advanced problems, to achieve the effect of reducing slag iron hardening
Active Publication Date: 2020-12-15
SHOUGANG CORPORATION
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Problems solved by technology
[0007] Patent No. 20051009027.6 "A Method for Recovering Iron from Steel Slag Powder" uses crushing, step-by-step grinding and step-by-step magnetic separation to separate iron from steel slag and recover it. However, Fe in FeO in slag It cannot be separated by magnetic separation, and the recovery rate of Fe in this method is not high
[0008] The patent No. 201010139211.5 "A device and method for recovering iron from steel slag" reduces steel slag in a depletion furnace. This method can achieve a high iron recovery rate, but the investment cost is high
[0009] The above patents respectively announced the main methods of dephosphorization and reduction and recovery of iron. However, there is no comprehensive treatment method for the desulfurization, dephosphorization and iron reduction and recovery of the three-depletion slag.
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[0034] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0035] After the decarburization furnace smelting is completed, the molten steel is tapped to the ladle for refining and smelting, P 2 o 5 Decarburization slag with low content (w(P 2 o 5 )≈1.5%) into the slag pot, the liquid slag is mixed into the dephosphorization furnace through the slag pot, and then the slag splashing operation starts. After the dephosphorization is completed, pour the hot slag into the slag tank, and transport it to the desulfurization slag stewing tank, add 1 / 2 of the desulfurization slag into the slag stewing tank, and add 1.0t of carbon powder into the slag tank. After the reaction is stable, draw water to the stewed slag tank. Transport the slag pot to the slag pit, and use a hook machine to turn the slag and mix it...
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The invention discloses a method for recycling iron by cooperating with furnace slag desulfurization and dephosphorization in a full desulfurization dephosphorization desiliconization process. The method is characterized in that decarburized furnace slag is returned to a dephosphorization furnace for being recycled, sulfur in devulcanized slag is removed by FeO in the dephosphorizined furnace slag, carbon powder is supplemented for reducing the rest of FeO and P2O5 in high-temperature liquid-state furnace slag, and the purpose of recycling iron is achieved by utilizing steel slag waste heat, so that the purpose of treating waste with waste is achieved, and gas generated by reaction of the two further can be utilized to reduce slag iron hardening. Treated converter slag serving as pre-melting slag and an iron-containing cooling material are returned to a converter for being reapplied. In a mixing treatment process, gas-state phosphor recycling of the converter slag is performed, and oxidization-hydration treatment is performed for converting the gas-state phosphor into phosphoric acid and CO2 harmless gas.
Description
technical field [0001] The invention relates to a method for slag desulfurization and dephosphorization in cooperation with ferrite recovery in the three-removal process, and belongs to the technical field of steelmaking and refining. Background technique [0002] Converter slag is a by-product of converter steelmaking. It concentrates the oxides and sulfides formed after the charge is oxidized, mainly including the eroded furnace lining and lining materials; impurities brought in by the metal charge, such as sediment; The slagging materials and fluxes added to adjust the properties of steel slag, such as limestone, iron ore, fluorite, etc. In the steelmaking process, the converter slag produced per ton of steel is 80-120kg. As the main waste in the metallurgical industry, the converter steel slag is discharged in a very large amount every year. [0003] According to statistics, in 2014, the amount of steel slag dumped in my country was about 130 million tons, and the amoun...
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IPC IPC(8): C21B3/06C22B1/11C01B25/20
CPCC01B25/20C21B3/06C21B2200/00C22B1/11Y02W30/50Y02P20/129
Inventor 贾雅楠季晨曦潘红伟吉立鹏田志红
Owner SHOUGANG CORPORATION