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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Problems solved by 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 titanium is not ideal; Panzhihua Mining Company uses Changsha Institute of Mining and Metallurgy to provide "Tunnel Kiln-Reduction Grinding Method to Produce Iron Powder for Powder Metallurgy", the process conditions are reduction temperature 1150°C, reduction time (referring to the reduction with 400g material in the laboratory) 4h, total coke consumption (coke / ore) 50-55%; after crushing, two grindings and two separations are used, the primary grinding particle size is less than 75um, accounting for 65%, the secondary grinding particle size is less than 75um, accounting for 55%, the two stages of beneficiation are gravity separation, annealing temperature 800 ℃, holding time 2.5 h, in the industrial test, it is reflected that the refractory material consumption of this process is high, the energy consumption is high, and the yield is low, so the production was forced to stop due to the high cost; Qiu Guanzhou et al. University Press) adopts the "rotary kiln-reduction grinding method to produce iron powder for steelmaking" provided by Central South University. The process conditions are reduction temperature 1100 ℃, reduction time 3h, and total coke consumption (carbon / iron) 68% After crushing, two grindings and two separations are used. The first-stage grinding particle size is less than 75um, accounting for 99%, and the second-stage grinding particle size is less than 75um, accounting for 96%. The two-stage beneficiation adopts magnetic separation. The reason for the ring formation is that the reduction temperature is not higher than 1100°C, which leads to unsatisfactory growth of iron grains under conventional heating. The result is a product with fine particle size, low TFe content, and TiO 2 High content, it is difficult to produce high value-added reduced iron powder for powder metallurgy

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