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Production method of ferro-titanium with low impurity content

A production method and low-impurity technology, applied in the field of ferroalloy smelting, can solve problems such as large fluctuations in ferro-titanium, high hardness of ferro-titanium alloy, difficulty in crushing, and influence on precise control, etc., to achieve low content of impurities and harmful elements, simple and easy production method Line, solve the effect of difficult control

Active Publication Date: 2017-07-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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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

Method used

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  • Production method of ferro-titanium with low impurity content

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Experimental program
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Effect test

Embodiment 1

[0038] Use a crucible furnace to melt the extra sponge titanium (titanium content 99.8%) in a vacuum, and heat it up to 1700°C; use a converter and an LF furnace to melt [C]+[Si]+[Mn]+[P]+ [S]+[Al]+[V]+[Ti] was treated to 0.4%, and the temperature was raised to 1710°C; the weight ratio of iron source and titanium source was 7:3, and the high-temperature molten iron was hoisted under vacuum conditions, and the pre- Under the condition of vacuum protection, the molten titanium melted through the crucible furnace and heated to 1700°C is poured into the molten iron ladle, and the two metal liquids are mixed in the hedge, and the composition is homogenized by blowing argon gas at the bottom of the ladle. Impurity control, argon supply intensity is 0.25m 3 / (min·t), the argon blowing time is 15min; after the homogenization is completed, the ferro-titanium alloy solution is plate-cast under vacuum conditions, and the ferro-titanium alloy is broken and packaged after the alloy is cool...

Embodiment 2

[0040] Use a resistance furnace to melt titanium shavings (99.5% titanium content) in an Ar gas protection atmosphere, and raise the temperature to 1690°C; use an electric furnace to melt the [C]+[Si]+[Mn]+[P]+[S ]+[Al]+[V]+[Ti] to 0.3%, and heated up to 1700°C; the weight ratio of iron source and titanium source was 3:7, and the high-temperature molten iron was hoisted under the protection of argon, and the pre- Under the protection of argon, the molten titanium melted by the resistance furnace and heated to 1650°C is poured into the molten iron ladle, and the two metal liquids are mixed in the hedge, and the composition is homogenized by blowing argon gas at the bottom of the ladle. And control impurities, the argon supply intensity is 0.5, and the argon blowing time is 10 minutes; after the homogenization is completed, the ferro-titanium alloy solution is plate-cast under vacuum conditions, and the ferro-titanium alloy is crushed and packaged after the alloy is cooled to 100...

Embodiment 3

[0042] Use a resistance furnace to melt titanium chips (titanium content 99.9%) in a vacuum and raise the temperature to 1698°C; use an electric furnace + LF furnace to melt [C]+[Si]+[Mn]+[P]+[S ]+[Al]+[V]+[Ti] to 0.4%, and heated up to 1720°C; the weight ratio of iron source and titanium source was 5:5, and the high-temperature molten iron was hoisted under the protection of argon, and the pre- Under the protection of argon, the titanium liquid melted by the resistance furnace and heated to 1680°C is poured into the molten iron ladle, the two metal liquids are mixed in the hedge, and the composition is homogenized by blowing argon gas at the bottom of the ladle And control impurity, argon supply intensity is 1.0m 3 / (min·t), the argon blowing time is 2min; after the homogenization is completed, the ferro-titanium alloy solution is plate-cast under vacuum conditions, and the ferro-titanium alloy is broken and packaged after the alloy is cooled to 100°C or below. The Ti conten...

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Abstract

The invention relates to a production method for low-impurity-content ferrotitanium, and belongs to the technical field of ferroalloy smelting. The production method for the low-impurity-content ferrotitanium is provided to solve the technical problem. The method comprises the steps that common molten iron is adopted as an iron source, the molten iron is smelted, the total content of impurity elements in the molten iron is controlled within 0.5%, and meanwhile the temperature of the molten iron is raised to be 1,700 DEG C or above; and the molten iron is suspended under the vacuum or inert gas shielding condition, titanium liquor which is molten down in advance under the vacuum or inert gas shielding condition and heated to be 1,690 DEG C or above is poured into a ladle, opposite stamping mixing and argon bottom blowing are carried out, then casting and cooling are carried out, and the ferrotitanium is obtained. According to the method, ferrotitanium series products different in titanium content requirement can be produced; the production method is simple and practicable, high in ingredient control precision, low in content of impurities and harmful elements and high in finished ferrotitanium product quality; and the problems that in a traditional ferrotitanium production technology, the control difficulty is large, and the impurity content is high are effectively solved.

Description

technical field [0001] The invention relates to a method for producing ferro-titanium with low impurity content, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02C22C35/00C22C33/04C22C38/14
CPCC22C1/02C22C14/00C22C33/04C22C35/00C22C38/14
Inventor 陈炼戈文荪冉茂华王建曾建华张国才成波仲剑丽
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP