Method for preparing natural micro alloy iron powder from vanadium-titanium-iron headings by microwave radiation

Abstract

The present invention relates to a method for extracting nature microalloy iron powder by utilizing microwave radiation to heat varadium-titanium-iron concentration pellet containing compound additive, said compound additive contains 10-20% of coke, 0-5% of sodium sulfate and 0-5% of iron powder. Said method includes the following steps: controlling pellet drying temperature at 130-150 deg.C for 30-40 min; adding 20%-50% of reductant agent coke, making reduction in microwave oven, reduction temperature is 1100-1300 deg.C and time is 60-120 min, after the pellet is broken, using hydrogen gas with 5-7 H min to make reduction, reduction temperature is 750-850 deg.C and reduction time is 120-240 min. so as to obtain the microallyiron powder whose grain size is less than 180 micrometers.

Description

[0001] (1) technical field: the present invention relates to a kind of technical field of producing natural microalloyed iron powder from vanadium-titanium iron ore concentrate with pyrometallurgical method. (2) Background technology

[0002] Known technology of producing iron powder with vanadium-titanium-iron concentrate has Liang Diande's "Direct return technology in the separation of vanadium-titanium-magnetite iron and titanium and the utilization of vanadium extraction technology" ("Chonggang Technology" 2002 No. 3 ) describes the report of the Soviet Union that adding 15% sodium salt to the vanadium-titanium iron concentrate was reduced at 1050°C, and then ground and magnetically separated to obtain iron powder containing more than 98% iron and TiO 2 75-80% titanium-rich material; Poland, New Zealand and other countries have also reported the test results of reduction grinding separation of vanadium-titanium magnetite concentrate, but the separation effect of iron and t...

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