Method for preparing high-titanium iron by step-by-step metal thermal reduction

Abstract

The invention discloses a method for preparing high-titanium iron by step-by-step metal thermal reduction, which comprises an aluminum thermal reduction smelting step and a reinforced reduction refining step, wherein the raw materials include rutile or high-titanium slag, aluminum powder, iron ore concentrate, slag forming agent and KClO3 in a mass ratio of 1.0: 0.37-0.50: 0.05-0.10: 0.15-0.25: 0.20-0.25, and the smelting temperature is 1,900 to 2,200 DEG C; the reinforced reduction refining time in the second step is 10 to 30 minutes, and after the refining is finished, a high-titanium iron alloy is obtained by cooling, ingot formation and impurity removal; and the composite reducing agent is calcium-magnesium alloy. The method has the advantages of wide raw material source and low production cost; the step-by-step reduction operations are adopted in the method, the reduction smelting of the first step is performed under the condition that the aluminum is insufficient, and the calcium-magnesium alloy composite reducing agent is adopted in the deoxidization refining of the second step, so the Al residue in the high-titanium iron alloy is remarkably reduced, and oxygen is effectively removed; and the transfer of high-temperature melt is realized by casting, and the metal slag separation process is reinforced.

Description

technical field

[0001] The invention belongs to the technical field of ferrotitanium alloys, and relates to a method for preparing high ferrotitanium, in particular to a method for preparing ferrotitanium by step-by-step metallothermal reduction. Background technique

[0002] Ferro-titanium is an intermediate alloy of iron and titanium with a titanium content of 20% to 75% obtained through reduction or remelting, among which titanium content of 60% to 75% is high-titanium ferroalloy. High-titanium iron with a titanium content of 65% to 75% has been widely used and paid attention to due to its excellent performance such as corrosion resistance, high temperature resistance, wear resistance, and appropriate specific gravity. High ferro-titanium is an important raw material for smelting special steel, structural steel and special alloy. It is an irreplaceable important raw material in aviation, aerospace, and weapon industries. It is also widely used in petroleum, chemical, mach...