Method for producing ferro-titanium by remelting method

Abstract

The invention provides a remelting method for producing titanium iron, and belongs to the technical field of iron alloy smelting. The invention solves the technical problem of remelting method for producing titanium iron. The method uses ordinary iron as an iron source; molten iron smelting is carried out to control the impurities in the molten iron within 0.5%; the molten iron is heated to higher than 1700 DEG C, and hanged in vacuum or inert gas protection; and a titanium source is added in molten iron; constant bottom blowing of inert gas is carried out; and then casting cooling is carried out. The method of the invention can not only produce titanium iron series products with different titanium content requirements, and the production method is simple, has the advantages of high component control precision, low content of impurity and harmful elements; and the titanium iron product has high quality. The invention effectively solves the problems of difficult control and high content of impurities in a traditional titanium iron production process.

Description

technical field [0001] The invention relates to a method for producing ferro-titanium by a remelting method, and belongs to the technical field of ferroalloy smelting. Background technique [0002] Titanium can increase the wear resistance and tensile strength of steel, and can be used as a deoxidizer and degasser. The deoxidation ability of titanium is much higher than that of silicon and manganese, and it can reduce the segregation of steel ingots, improve the quality of steel ingots and increase the yield. Titanium has a low specific gravity of only 4.5 g / ml, a high melting point of 1690°C, and is easily oxidized. It is oxidized and burned on the liquid steel surface, resulting in too much loss, and it is difficult to control the content. The preparation process is complicated, the production cost is high, the price is expensive, etc., so it is not suitable to directly add to molten steel in the state of pure metal and non-metal monomer during steelmaking. For this reas...

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Problems solved by technology

[0005] Judging from the published invention patents, the production of ferro-titanium mainly uses ilmenite, titanium slag, rutile and other titanium-containing materials as titanium sources, aluminum, magnesium, carbon, etc. as reducing agents, and lime, fluorite, etc. Slag agent, some inventions also use potassium chlorate as the ignition agent. Although these methods can successfully produce titanium-iron alloys with different titanium contents, the methods have disadvantages such as violent reaction, short reaction time, long production cycle, large fluctuations in alloy composition, and high impurity content. , which greatly affects the composition precision control of titanium alloy steel grades

For example: the alloys with different titanium content produced by the above methods are in different states. Ferro-titanium alloys with low titanium content are easy to pulverize, and ferro-titanium alloys with high titanium content are hard to break. Quantity control is difficult

The ferro-titanium produced by the existing method fluctuates greatly in composition, and contains high content of impurity elements at the same time, so the requirements of the national standard for the composition of the ferro-titanium are relatively broad (the chemical composition of the ferro-titanium in the national standard is shown in Table 1), silicon, manganese, The content of aluminum can be 1% or more, the content of phosphorus and sulfur is relatively high, and high-grade ferro-titanium still has problems such as high content of oxygen and nitrogen (such as the nitrogen content of FeTi70 is as high as 0.80%, and the oxygen content is above 5.00%). Both greatly affect the precise control of molten steel composition and the control of harmful elements in the process of titanium alloying

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