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CN-121992210-A - Method for preparing ferrotitanium alloy by taking melted titanium slag and vanadium-titanium metallized pellets as raw materials

CN121992210ACN 121992210 ACN121992210 ACN 121992210ACN-121992210-A

Abstract

The invention belongs to the technical field of metallurgy, and particularly discloses a method for preparing ferrotitanium alloy by taking melted titanium slag and vanadium-titanium metallized pellets as raw materials, which comprises the following steps of S1, taking melted titanium slag, vanadium-titanium metallized pellets, an aluminum reducing agent and a slag former as raw materials, and carrying out batching and mixing according to chemical components of target ferrotitanium alloy to obtain charging materials; S2, smelting the charging materials at a high temperature, S3, cooling to room temperature after smelting, crushing slag shells, and separating slag from gold to obtain the ferrotitanium alloy. According to the invention, the ferrotitanium alloy is directly prepared by adopting a one-step method of an aluminothermic reduction process under the auxiliary heating modes such as electric heating and the like through the externally matched vanadium-titanium metallized pellets of the molten titanium slag, and two vanadium-titanium secondary resources are cooperatively treated, so that the method has the advantages of short process flow, low production cost, good slag-gold separation, high element yield of ferrotitanium and the like, and is suitable for industrial application.

Inventors

  • YANG XIN
  • YANG ZE
  • AI LUN
  • LI XIAOJIE
  • LIU FENG

Assignees

  • 西安慧金科技有限公司

Dates

Publication Date
20260508
Application Date
20260224

Claims (10)

  1. 1. The method for preparing the ferrotitanium alloy by taking the molten titanium slag and the vanadium-titanium metallized pellets as raw materials is characterized by comprising the following steps of: s1, taking molten titanium slag, vanadium-titanium metallized pellets, an aluminum reducing agent and a slag former as raw materials, and mixing according to chemical components and contents of target ferrotitanium alloy to obtain charging materials; S2, smelting the charging material at high temperature; S3, after smelting, cooling to room temperature, crushing slag shells, and separating slag and gold to obtain the ferrotitanium alloy.
  2. 2. The method for preparing ferrotitanium according to claim 1, wherein in the step S1, the melted titanium slag contains 20% -75% of TiO 2 by mass; And/or the vanadium-titanium metallized pellets are obtained by reducing vanadium-titanium ore through a hydrogen-based shaft furnace; and/or, the metallization rate of the vanadium-titanium metallized pellets is equal to or higher than 80%; and/or the aluminum reducing agent is aluminum particles and/or aluminum scraps; and/or, adding excessive aluminum reducing agent during batching.
  3. 3. A method for producing a ferrotitanium alloy as claimed in claim 2, wherein in step S1, the actual addition amount of the aluminum reducing agent is 1.2 to 1.5 times the theoretical addition amount of the aluminum reducing agent required for reducing reducible oxides in the molten titanium slag.
  4. 4. The method for producing an ferrotitanium alloy as claimed in claim 1, wherein in the step S1, the slag former is a calcareous slag former; And/or the mass fraction of the slag former in the charging material is 5% -35%.
  5. 5. A process for preparing ferrotitanium as claimed in claim 4, wherein the calcareous slag former is selected from calcium oxide and/or calcium fluoride.
  6. 6. A process for preparing ferrotitanium according to claim 1, wherein in step S2, the smelting is performed under an inert atmosphere; and/or carrying out gradient heating according to a preset heating curve in the smelting process; and/or smelting temperature is 1400-1800 ℃.
  7. 7. The method for preparing ferrotitanium according to claim 6, wherein in the step S2, the smelting process is carried out according to a preset temperature rise curve for gradient temperature rise, and the method comprises the steps of heating to 1100-1300 ℃ in the first stage, preserving heat for 0.5-1 h, continuously heating to 1400-1800 ℃ in the second stage, and preserving heat for 1-2 h; And/or carrying out gradient heating according to a preset heating curve in the smelting process by auxiliary heating means.
  8. 8. A process for producing a ferrotitanium alloy as claimed in claim 1, wherein in step S3, after the completion of the smelting, the heating is stopped and the furnace is cooled to room temperature.
  9. 9. The method for preparing ferrotitanium alloy according to any one of claims 1-8, wherein in the step S3, the obtained ferrotitanium alloy contains the following chemical components, by mass, 25.0% -45.0% of Ti and 30.0% -50% of Fe.
  10. 10. The method for preparing ferrotitanium alloy according to claim 9, wherein in the step S1, the target ferrotitanium alloy is ferrotitanium alloy which accords with the national standard GB/T3282-2012 and is marked as FeTi30 or FeTi 40.

Description

Method for preparing ferrotitanium alloy by taking melted titanium slag and vanadium-titanium metallized pellets as raw materials Technical Field The invention relates to the technical field of metallurgy, in particular to a method for preparing ferrotitanium alloy by taking melted titanium slag and vanadium-titanium metallized pellets as raw materials. Background After vanadium titano-magnetite is smelted by a blast furnace or non-blast furnace process, a large amount of titanium-containing blast furnace slag or molten titanium slag is produced, and the content of titanium oxide (mainly TiO 2) in the slag is generally more than 20%, so that the vanadium titano-magnetite is an important secondary titanium resource. At present, the recycling utilization of the titanium slag is mainly focused on extracting titanium element, for example, titanium white or sponge titanium is produced by a sulfuric acid method or a chlorination method, but the problems of long flow, high energy consumption, large discharge amount of three wastes and the like exist. Pyrometallurgy, particularly aluminothermic reduction, is a potential route to titanium alloys directly from titanium slag. The ferrotitanium is an important iron and steel additive, and when the ferrotitanium is prepared by directly reducing high-titanium slag by adopting a traditional aluminothermic method, the problems of severe reaction heat release, extremely high furnace temperature, theoretical temperature of a reaction zone reaching 1800-2000 ℃, extremely easy occurrence of splash and titanium burning loss and alloy segregation are mainly solved, and (2) the aluminothermic reduction reaction instantaneously occurs, so that the generated ferrotitanium metal liquid drops have short settling time, are difficult to effectively gather and settle and are completely separated from slag, and the slag-gold separation is difficult, so that the alloy yield is low. After slag breakage, a large number of fine metal beads were observed to be packed or embedded in the slag phase, forming a "metal-slag" mixture. Furthermore, the self-propagating aluminothermic process has limited heat supply, is difficult to maintain chemical reaction continuously, and can affect alloy yield. (3) In order to reduce impurities such as alloy carbon, sulfur, phosphorus and the like, expensive titanium concentrate or high titanium slag is generally used as a raw material, so that the cost is high, and (4) an intermediate product, namely vanadium-titanium metallized pellets, generated by the direct reduction process of vanadium-titanium magnetite cannot be cooperatively utilized. The vanadium-titanium metallized pellet is a product obtained by directly reducing vanadium-titanium magnetite by gas base or coal base, has high metal iron content and metallization rate, contains a certain amount of vanadium and titanium, is a high-quality raw material for short-process steelmaking, and has better resource and economic value when being treated together with titanium slag. In the prior art, the technical proposal of organically combining melted titanium slag with vanadium-titanium metallized pellets, directly preparing medium-low ferrotitanium alloy through an aluminothermic reduction process and simultaneously maximally recovering iron and titanium elements is lacking. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a method for preparing ferrotitanium by taking melted titanium slag and vanadium-titanium metallized pellets as raw materials, wherein the melted titanium slag and the vanadium-titanium metallized pellets are organically combined, and the ferrotitanium is directly prepared by a thermit reduction process, so that the method has the advantages of short process flow, low raw material cost, and capability of maximally recovering iron and titanium elements, and is suitable for industrial application. To achieve the above and other related objects, the present invention provides a method for preparing ferrotitanium alloy from melted titanium slag and vanadium-titanium metallized pellets, comprising the steps of: s1, taking molten titanium slag, vanadium-titanium metallized pellets, an aluminum reducing agent and a slag former as raw materials, and mixing according to chemical components and contents of target ferrotitanium alloy to obtain charging materials; S2, smelting the charging material at high temperature; S3, after smelting, cooling to room temperature, crushing slag shells, and separating slag and gold to obtain the ferrotitanium alloy. In step S1, the melted titanium slag contains 20-75% of TiO 2 by mass. Further, in the step S1, the vanadium-titanium metallized pellets are obtained by reducing vanadium-titanium ore through a hydrogen-based shaft furnace. Further, in step S1, the metallization rate of the vanadium-titanium metallized pellets is equal to or higher than 80%. Further, in step S1, the aluminum reducing agent is aluminum par