Technique method for directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings

Abstract

The invention relates to a technique method for directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings, belonging to the field of iron making. The method adopts brown coal as the reducing agent, and simultaneously CaO is added as slag former and used for increasing alkalinity to synergize with Na2O and K2O in the tailings to react with SiO2 and Al2O3 to generate zeolite-like stable mineral so as to boost extraction and separation of sponge iron in products of deep reduction. The products of deep reduction are subject to two-section ore grinding-two-section low intensity magnetic separation technique to obtain sponge iron with iron grade larger than 90% and TiO2 smaller than 0.20%. The invention is simple in technique and easy to control, and has large reserves of raw materials and low price; the product can be used as raw material for steel making; other impurities meet steel making requirements, the technique flow of processing iron ore into rolled steel is shortened, the environment pollution caused by sintering, pelletizing and blast furnace iron making of iron ore concentrate obtained by other methods can be avoided, and the invention has obvious environment benefit and energy conservation and consumption reduction effects.

Description

technical field [0001] The invention belongs to the field of iron smelting, and relates to a kind of solid waste - a process method for directly producing sponge iron by deep reduction of vanadium extraction tailings, and the method is particularly aimed at high-content Na 2 O, K 2 O and high content of TiO 2 The deep reduction-grinding-weak magnetic separation of the industrial waste tailings obtains sponge iron as a high-quality steelmaking raw material. Background technique [0002] Vanadium extraction tailings are vanadium titanomagnetite blast furnace smelting, adding Na 2 CO 3 The residual residue after roasting and extracting vanadium contains more than 30% TFe and about 10% TiO 2 and a small amount of V 2 O 5 , is an important extraction TFe, TiO 2 waste resources. However, due to the addition of a large amount of Na during the vanadium extraction process 2 CO 3 , resulting in the Na of the remaining tailings 2 O, K 2 The O content is very high. Na 2 O ...

AI Technical Summary

Problems solved by technology

Among them, although method ① can recover the iron preferably, it produces a large amount of alkaline wastewater, and the tailings after washing must be filtered and dried, and the process is cumbersome; although method ② can select some iron with a grade of about 52% Concentrate, but the recovery rate is very low, only about 20%; method ③ Although the separation of iron minerals can be strengthened through the action of chemicals, because most of the iron minerals exist in the form of solid solution in the tailings, even if the particle size is fine To -10μm, there are still few iron minerals that are dissociated individually, so flotation cannot extract the iron minerals from the tailings well, and a more suitable method must be found

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