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Method for preparing ferro-titanium by carbothermic reduction-self-propagating

A titanium-iron alloy, self-propagating technology, applied in the field of metallurgy, can solve the problem of high energy consumption, achieve the effect of improving titanium grade, reducing production cost, and remarkable effect

Active Publication Date: 2019-01-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the separation process of ferro-titanium, the preparation of high-titanium slag by electric arc furnace will consume a lot of energy, and the production of titanium dioxide by sulfuric acid method will produce a large amount of waste liquid

Method used

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  • Method for preparing ferro-titanium by carbothermic reduction-self-propagating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for producing ferro-titanium alloy by using carbothermal reduction of ilmenite as raw material in a self-propagating manner, comprising the steps of:

[0031] 1. Preparation of ilmenite by carbothermal reduction:

[0032] With ilmenite (chemical composition and weight percentage thereof are Fe 2 o 3 : 15.1~17.5%, FeO: 25.8~27.8%, TiO 2 : 43.4~45.6%, CaO: 0.8~0.9%, SiO 2 : 4.6~5.6%, MgO: 0.9~1.1%, Al 2 o 3 : 1.0~1.3%, the balance is unavoidable impurity), the oxygen combined with the elemental iron in the coal powder and the fixed carbon in the coal powder are proportioned according to the molar ratio of 1:0.8, and 1% bentonite of ilmenite mass is added, sprayed 7% of water according to the mass of the ilmenite is used for mixing and pelletizing to obtain pellets of 8-13 mm. Dry the green pellets in an oven at 105°C for 4 hours, and then place them in a nitrogen atmosphere furnace at 1100°C for reduction for 5 hours to obtain low-carbon and high-reduction ...

Embodiment 2

[0038] This embodiment is on the basis of embodiment 1, the difference is that the oxygen combined with the iron in the ilmenite and the fixed carbon in the graphite are prepared according to the molar ratio of 1:1, and the bentonite is added to the mass of the ilmenite. 3% of the ilmenite mass, spraying 8.5% of water by the mass of the ilmenite to carry out mixing and pelletizing, and then put the pellets into an argon atmosphere furnace at 1200°C for reduction for 3 hours to obtain carbothermally reduced ilmenite, and grind Pass through a 200-mesh sieve to obtain carbothermally reduced ilmenite powder for subsequent use.

[0039] Carbothermally reduced ilmenite powder, metal aluminum, potassium chlorate, titanium dioxide, calcium oxide and calcium fluoride are mixed according to a mass ratio of 100:138:62:189:32:12.

[0040] Finally, a ferro-titanium alloy is obtained, wherein the titanium content is 49.7%.

Embodiment 3

[0042] This example is based on Example 1, the difference is that the oxygen combined with the iron in the ilmenite and the fixed carbon in the pulverized coal are mixed and pelletized according to the molar ratio of 1:1.2, wherein the bentonite is added as titanium 2% of the mass of iron ore, spraying 9% of water according to the mass of ilmenite to carry out mixing and pelletizing, and then put the pellets into an argon atmosphere furnace at 1180°C for reduction for 5 hours to obtain carbothermally reduced ferrotitanium The ore is ground until it passes through a 200-mesh sieve to obtain carbothermally reduced ilmenite powder for future use.

[0043] Carbothermally reduced ilmenite powder, metal aluminum, potassium chlorate and sodium chlorate are mixed in a mass ratio of 1:1, and titanium dioxide, calcium oxide and calcium fluoride are mixed in a mass ratio of 100:136:74:190:27:13.

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Abstract

The invention relates to a method for preparing ferro-titanium by carbothermic reduction-self-propagating. The method comprises the following steps: (S1) adding ilmenite into pulverized coal or graphite to obtain a pellet; putting the pellet into an inert atmosphere at 1,000-1,200 DEG C for reduction to obtain carbothermic-reduction ilmenite pellet; breaking and grinding the carbothermic-reductionilmenite pellet to obtain carbothermic-reduction ilmenite powder for later use; (S2) uniformly mixing the carbothermic-reduction ilmenite powder obtained in step (S1) with metal aluminum, sodium chlorate, titanium dioxide, calcium oxide and calcium fluoride; (S3) igniting the upper part; after complete reacting, cooling and separating the slag to obtain ferro-titanium. The method provided by theinvention avoids the problems in ferro-titanium separation, reduces the process links, reduces the production cost, effectively removes organic impurities and water in minerals, reduces the consumption of the reducing agent aluminum as well as the slag generation in a ferro-titanium smelting process, and raises the ferro-titanium grade.

Description

technical field [0001] The invention relates to a method for preparing ferro-titanium alloy by adopting carbothermal reduction-self-propagation, and belongs to the technical field of metallurgy. Background technique [0002] As an important metal material, titanium-iron alloy has important applications in industry. In terms of steel, titanium-iron alloys can be used as deoxidizers, degassers and alloying agents to reduce segregation of steel ingots and improve the strength and wear resistance of steel. In addition, in chemical industry and energy, it is also an important electrode coating and hydrogen storage material. At present, its main production process is remelting method and thermite method. [0003] As a titanium-containing raw material, ilmenite is mainly composed of iron oxide and titanium dioxide. It has the advantages of abundant reserves and low price. It is an important raw material for extracting metallic iron and titanium dioxide. However, in the separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C33/02B22F3/23
CPCB22F3/23C22C1/0458C22C1/058C22C33/0228
Inventor 薛向欣高子先程功金杨合
Owner NORTHEASTERN UNIV
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