Preparation method of sintering flux for iron ore sintering
A technology of sintering flux and iron ore, which is applied in the field of metallurgical engineering, can solve the problems of increasing the burden of slag discharge and the increase of slag system, and achieve the effect of improving reducibility and strength, improving strength and increasing yield
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[0025] The flow process of the sintering flux preparation method for iron ore sintering of the present invention is as follows figure 1 As shown, it specifically includes the following steps:
[0026] A) After the converter slag is dried at 120°C, it is pulverized into a powder. It is required that the particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder.
[0027] It is required that particles with a particle size of -100 mesh account for more than 85% of the total weight of the powder in order to ensure that the converter slag powder can more fully react with oxygen during the subsequent oxidation roasting process.
[0028] B) The converter slag powder obtained in the previous step is oxidized and roasted in the air at a temperature of 800-1100°C, and kept at the roasting temperature for 1-2 hours.
[0029] In the process of oxidizing and roasting converter slag, the reaction (1) occurs when the temperature is ...
Embodiment 1
[0046] The main composition of the converter slag produced by steelmaking used in this example is shown in Table 1, wherein the mass percentage of CaO accounts for 40.21%, and the mass percentage of SiO 2 The mass percentage of TFe accounts for 14.69%, the mass percentage of TFe accounts for 18.44%, and the mass percentage of Al 2 o 3 The mass percentage accounts for 2.40%. The XRD pattern (X-ray diffraction pattern) of the converter slag is as follows figure 2 shown, where θ is the Bragg diffraction angle.
[0047]
[0048] Using the converter slag as a raw material, the sintering flux is prepared by oxidizing and roasting through the preparation method of the present invention, and the specific process is as follows:
[0049] The converter slag is dried at 120°C and crushed into powder. The particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder; then, the converter slag powder is oxidized and roasted at ...
Embodiment 2
[0052] In this embodiment, the converter slag shown in Table 1 is used. Among its main components, CaO accounts for 40.21% by mass, SiO 2 The mass percentage of TFe accounts for 14.69%, the mass percentage of TFe accounts for 18.44%, and the mass percentage of Al 2 o 3 The mass percentage accounts for 2.40%. Using the converter slag as a raw material, the sintering flux is prepared by oxidizing and roasting through the preparation method of the present invention, and the specific process is as follows:
[0053] The converter slag is dried at 120°C and crushed into powder. The particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder; then, the converter slag powder is oxidized and roasted in air at 900°C. And keep the temperature at the calcination temperature for 1-2 hours; after calcination, the product obtained is naturally cooled to room temperature, and the sintering flux product is obtained.
[0054] The resu...
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