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Method for preparing ferrotitanium alloy from ilmenite by virtue of magnesiothermic reduction in cryolite fused salt medium

A technology of ferro-titanium alloy and molten salt medium, which is applied in the field of metallurgy, can solve the problems of large-scale industrial production and retention, and achieve the effects of low oxygen content, short production process and energy saving

Active Publication Date: 2015-09-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods still have many deficiencies, and currently only stay in the laboratory stage, and have not yet carried out large-scale industrial production.

Method used

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  • Method for preparing ferrotitanium alloy from ilmenite by virtue of magnesiothermic reduction in cryolite fused salt medium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition of the ilmenite concentrate used contains TiO by mass 2 41.80%, FeO 29.98%, Fe 2 o 3 10.04%, CaO 1.45%, MgO 2.12%, SiO 2 9.88%, Al 2 o 3 3.08%, the balance is impurities;

[0037] NaF and AlF in cryolite 3 The molar ratio is 2.8:1;

[0038] Mix the ilmenite concentrate and cryolite ball mill evenly to obtain the mixed material, ilmenite accounts for 8% of the total mass of the mixed material; heat to 950~990°C and melt to form cryolite molten salt, the ilmenite concentrate is melted in the ice crystal in rock molten salt;

[0039]Under protective atmosphere conditions, the reducing agent metal magnesium is added in the cryolite molten salt, and the addition amount of metal magnesium is 24 according to the molar ratio of metal magnesium and titanium in the ilmenite concentrate;

[0040] A reduction reaction occurs at the interface between metallic magnesium and cryolite; all materials are kept at 990°C for 4 hours, and the formed magnesium-tit...

Embodiment 2

[0044] Method is with embodiment 1, and difference is:

[0045] (1) The composition of ilmenite concentrate contains TiO by mass 2 47.68%, FeO 36.89%, Fe 2 o 3 9.95%, CaO 0.15%, MgO 1.28%, SiO 2 2.04%, Al 2 o 3 1.60%, the balance is impurities;

[0046] (2) NaF and AlF in the cryolite used 3 The molar ratio is 2.6:1;

[0047] (3) Ilmenite accounts for 7% of the total mass of the mixture;

[0048] (4) The amount of metal magnesium added is 22 according to the molar ratio of metal magnesium to titanium in the ilmenite concentrate;

[0049] (5) Heat all the materials at 980°C for 1 hour;

[0050] (6) Magnesium-titanium-iron alloy contains Mg 78.69%, Ti 17.48%, Fe 2.75%, Si 0.99% by mass percentage; titanium-iron alloy contains Ti 82.37%, Fe 12.96%, Si 3.26% by mass percentage.

Embodiment 3

[0052] Method is with embodiment 1, and difference is:

[0053] (1) The composition of ilmenite concentrate contains TiO by mass 2 48.98%, FeO 37.02%, Fe 2 o 3 9.67%, CaO 0.91%, MgO 1.92%, SiO 2 0.6%, Al 2 o 3 0.31%, the balance is impurities;

[0054] (2) NaF and AlF in the cryolite used 3 The molar ratio is 2.4:1;

[0055] (3) Ilmenite accounts for 6% of the total mass of the mixture;

[0056] (4) The amount of metal magnesium added is 20 according to the molar ratio of metal magnesium to titanium in the ilmenite concentrate;

[0057] (5) Heat all the materials at 970°C for 2 hours;

[0058] (6) Magnesium-titanium-iron alloy contains Mg 79.35%, Ti 18.34%, Fe 2.10%, Si 0.21% by mass percentage; titanium-iron alloy contains Ti 88.80%, Fe 10.17%, Si 0.82% by mass percentage.

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Abstract

The invention provides a method for preparing a ferrotitanium alloy from ilmenite by virtue of magnesiothermic reduction in a cryolite fused salt medium and belongs to the technical field of metallurgy. The method comprises the following steps: (1) mixing ilmenite concentrate and cryolite together by virtue of ball-milling and then heating for fusing; (2) under the condition of a protective atmosphere, adding metal magnesium, preserving heat within the range of 950-990 DEG C and reacting for 1-4 hours, and cooling to a normal temperature; (3) distilling in vacuum, condensing the metal magnesium on a crystallizer, and obtaining the left part as the ferrotitanium alloy. The method is high in reaction rate and good in separation effect; the product is high in purity and relatively low in oxygen content; the production flow is relatively short, and therefore, the energy consumption is reduced and the production cost is decreased; the method is expected to be applied to in-situ extraction of moon resources, namely the ilmenite metal, in the future.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing ferro-titanium alloy by magnestic reduction of ilmenite in a cryolite molten salt medium. Background technique [0002] Titanium metal is an important strategic resource, and its content in the earth's crust is very rich, ranking seventh in terms of metals. [0003] Titanium is a very active element, especially has a very high affinity for oxygen; therefore, there is no free titanium element in nature, and it always exists in the state of titanium dioxide or titanate combined with oxygen, and often coexists with iron ; At present, TiO has been found in nature 2 There are more than 140 kinds of titanium minerals with a content of more than 1%, but there are only more than ten kinds of main titanium minerals. Under the existing economic conditions and technical level, the titanium minerals with useful value are mainly ilmenite and rutile. ...

Claims

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Application Information

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IPC IPC(8): C22B5/04C22B34/12C22C1/02C22C14/00
Inventor 石忠宁谢开钰刘小珍张鹏举关苹苹刘爱民高炳亮胡宪伟于江玉王兆文
Owner NORTHEASTERN UNIV