A kind of method for comprehensively recovering chromite from chromium-containing titanium medium ore
A technology of chromite and ilmenite, applied in chemical instruments and methods, improvement of process efficiency, magnetic separation, etc., can solve problems such as difficult recovery of chromite, and achieve stable product quality, simple method, and low cost Effect
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Embodiment 1
[0083] Put 2.0Kg of sample 1# in Table 2 containing chromium-containing titanium medium ore and 0.35Kg of reducing agent coal in a rotary kiln, at 1000 ℃, reduce it for 3h, after rapid cooling, the chromium-containing titanium medium ore can be reduced, and its metallization rate is 88.45%, the X-ray diffraction (XRD) of the reduced chromium-containing titanium ore is as follows figure 2 shown. Dry magnetic separation of reduced chromium-containing titanium ore at 3000GS intensity to obtain metal iron-containing reduced ilmenite material and magnetic separation tailings; the tailings are washed and separated to remove impurities and then dried to obtain chromite. The X-ray diffraction (XRD) of the reduced titanium-iron material containing metallic iron is as follows image 3 As shown, the reduced ferrotitanium material containing metallic iron contains Cr 2 O 3 is 0.078%, and the titanium recovery rate is 99.31% (titanium recovery rate = TiO2 in the reduced titanium-iron m...
Embodiment 2
[0085] The 2.0Kg sample 1# chromium-containing titanium medium ore in Table 2 was first placed in a rotary kiln, and oxidized at 750 °C for 1 hour in an air atmosphere. After cooling, add 0.35Kg of reducing agent coal, reduce at 1000 ℃ for 0.5h, after rapid cooling, reduce the chromium-containing titanium medium ore, and its metallization rate is 87.89%. Dry magnetic separation of the reduced chromium-containing titanium medium ore under 2000GS intensity to obtain metal iron-containing reduced ilmenite material and magnetic separation tailings; the tailings are washed and separated to remove impurities and then dried to obtain chromite. The reduced iron titanium material containing metallic iron contains Cr 2 O 3 It is 0.052%, the recovery rate of titanium is 99.25%, and the recovery rate of chromium can reach 98.93%.
Embodiment 3
[0087] Put 1.0Kg of sample 1# chromium-containing titanium medium ore in Table 2 in a fluidized bed, and use hydrogen as a reducing agent, and the fluidized bed exhaust contains 3.5% H 2 , at 800 ℃, reducing for 1h, after rapid cooling, the chromium-containing titanium ore is reduced, and its metallization rate is 35.79%. The dry magnetic separation of the reduced chromium-containing titanium ore under the intensity of 2500GS, the process is as follows Figure 5 As shown, the reduced ilmenite material containing metallic iron and the magnetic separation tailings are obtained; the tailings are washed and sorted to remove impurities and then dried to obtain chromite. The reduced iron titanium material containing metallic iron contains Cr 2 O 3 It is 0.087%, the recovery rate of titanium is 95.68%, the chromium content in chromite is 32.266%, and the recovery rate of chromium can reach 98.67%.
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