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Remelting method for producing titanium iron

A technology of ferrotitanium and remelting, applied in the field of ferroalloy smelting, can solve the problems of large fluctuation of ferrotitanium, great hardness of ferrotitanium alloy, hard to break, short reaction time, etc., achieves low content of impurities and harmful elements, and simple and easy production method , The effect of high precision of composition control

Active Publication Date: 2016-08-10
SICHUAN PAN YAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Remelting method for producing titanium iron

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Experimental program
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Effect test

Embodiment 1

[0035] Use converter and LF furnace to treat [C]+[Si]+[Mn]+[P]+[S]+[Al]+[V]+[Ti] of molten iron to 0.4%, and raise the temperature to 1710°C; Put the molten iron into the induction furnace, and continue to heat it under the condition of argon seal, add the extra sponge titanium (titanium content 99.8%) into the molten iron, and continuously blow the bottom blowing argon to stir and control impurities, the bottom blowing gas intensity is 0.3 N m 3 / t·min, the two metal liquids are mixed evenly, the ratio of titanium to iron is 3:7; after the homogenization is completed, the titanium-iron alloy liquid is plate-cast, and after the alloy is cooled to 100°C or below, the titanium-iron alloy is broken Package. The Ti content in the obtained ferro-titanium alloy is 29.89%, and the total content of other elements except iron is less than 0.3%.

Embodiment 2

[0037] Use an electric furnace to treat [C]+[Si]+[Mn]+[P]+[S]+[Al]+[V]+[Ti] in molten iron to 0.3%, and raise the temperature to 1700°C; Put it into the induction furnace, and continue heating under the condition of argon seal, add titanium shavings (titanium content 99.5%) into molten iron, and continuously blow argon to stir and control impurities, and the strength of the bottom blowing gas is 0.4Nm 3 / t·min, the two metal liquids are mixed evenly, the ratio of titanium to iron is 7:3; after the homogenization is completed, the titanium-iron alloy liquid is plate-cast, and the alloy is cooled to 100°C or below, and the titanium-iron alloy is broken Package. The Ti content in the obtained ferro-titanium alloy is 79.80%, and the total content of other elements except iron is less than 0.4%.

Embodiment 3

[0039] Use electric furnace + LF furnace to treat [C]+[Si]+[Mn]+[P]+[S]+[Al]+[V]+[Ti] of molten iron to 0.4%, and raise the temperature to 1720°C; Put the molten iron into the induction furnace, and continue heating under the condition of argon seal, add titanium chips (titanium content 99.8%) into the molten iron, and continuously blow argon gas at the bottom to stir and control impurities, and the intensity of the bottom blowing gas is 0.5Nm 3 / t·min, the two metal liquids are mixed evenly, the ratio of titanium to iron is 5:5; after the homogenization is completed, the titanium-iron alloy liquid is plate-cast, and after the alloy is cooled to 100°C or below, the titanium-iron alloy is broken Package. The Ti content in the obtained ferro-titanium alloy is 59.91%, and the total content of other elements except iron is less than 0.3%.

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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...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C1/02C22C14/00C22B9/16
CPCC22B9/003C22B9/16C22C1/02C22C14/00C22C35/00Y02P10/25
Inventor 陈炼戈文荪冉茂华王建曾建华张国才成波仲剑丽
Owner SICHUAN PAN YAN TECH
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