A kind of method for preparing al-ti-fe alloy by thermite reduction of ilmenite in cryolite-based molten salt

A technology of ilmenite and al-ti-fe, which is applied in the field of thermite reduction of ilmenite to prepare Al-Ti-Fe alloy, can solve the problems of low current efficiency, impure electrolytic products, increased production cost and energy consumption, etc. , to achieve good effect, fast reduction reaction rate, and reduce energy consumption

Active Publication Date: 2017-03-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, molten salt electrolysis of ilmenite has not been able to achieve industrial production, because its current efficiency is low, the electrolysis product is impure, and the molten salt electrolysis method needs to crush the ilmenite to less than 50 μm, and then sinter it at a high temperature of 800-1000 ° C Made into iron ore electrodes, which greatly increases the production cost and energy consumption

Method used

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  • A kind of method for preparing al-ti-fe alloy by thermite reduction of ilmenite in cryolite-based molten salt
  • A kind of method for preparing al-ti-fe alloy by thermite reduction of ilmenite in cryolite-based molten salt

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Experimental program
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Effect test

Embodiment 1

[0030] Using metal aluminum as the reducing agent, the ilmenite is subjected to thermite reduction in a cryolite-based molten salt medium at 930°C for 2 hours. The composition of ilmenite is: 41.70%TiO 2 , 30.24% FeO, 10.63% Fe 2 o 3 , 1.50% CaO, 1.89% MgO, 9.99% SiO 2 , 3.18% Al 2 o 3, and the rest is impurities. After the reaction, the alloy and molten salt are separated to obtain Al-Ti-Fe alloy and Al-rich 2 o 3 The cryolite-based molten salt, the Al-Ti-Fe alloy contains 83.55% Al, 15.15% Ti, 0.41% Fe, and 0.89% Si by mass percentage;

[0031] Among them, the rich Al 2 o 3 The cryolite-based molten salt is electrolyzed at 930 ° C, with Fe-Ni alloy as the anode, aluminum liquid as the cathode, and the current density of the cathode and anode in the electrolysis process is controlled at 0.4A / cm 2 , Metal aluminum is obtained at the cathode, the mass purity of Al in metal aluminum is 95.07%, contains Ti 1.93%, Fe 1.86%, and oxygen is obtained at the anode.

[0032] Th...

Embodiment 2

[0036] Using metal aluminum as the reducing agent, ilmenite was subjected to thermite reduction in cryolite-based molten salt medium at 955°C for 2 hours, and the composition of ilmenite was: 48.68%TiO by mass percentage 2 , 36.78% FeO, 10.97% Fe 2 o 3 , 0.05% CaO, 1.18% MgO, 0.67% SiO 2 , 0.60% Al 2 o 3 , and the rest is impurities. After the reaction, the alloy and molten salt are separated to obtain Al-Ti-Fe alloy and Al-rich 2 o 3 The cryolite-based molten salt, the Al-Ti-Fe alloy contains 79.25% Al, 18.78% Ti, 1.05% Fe, and 0.92% Si by mass percentage;

[0037] Among them, the rich Al 2 o 3 The cryolite-based molten salt was electrolyzed at 955°C to Fe-Ni-Al 2 o 3 The cermet is the anode, the aluminum liquid is the cathode, and the cathode and anode current densities of the electrolysis process are controlled at 0.6A / cm 2 , Metal aluminum is obtained at the cathode, the mass purity of Al in metal aluminum is 95.78%, contains Ti 2.11%, Fe 1.07%, and oxygen is obt...

Embodiment 3

[0042] Using metal aluminum as a reducing agent, ilmenite was subjected to thermite reduction in a cryolite-based molten salt medium at 965°C for 2 hours. The composition of ilmenite was: 49.85%TiO by mass percentage 2 , 35.50% FeO, 9.58% Fe 2 o 3 , 0.24% CaO, 1.99% MgO, 0.86% SiO 2 , 0.23% Al 2 o 3 , and the rest is impurities. After the reaction, the alloy and molten salt are separated to obtain Al-Ti-Fe alloy and Al-rich 2 o 3 The cryolite-based molten salt, the Al-Ti-Fe alloy contains 81.05% Al, 16.20% Ti, 1.88% Fe, and 0.87% Si by mass percentage;

[0043] Among them, the rich Al 2 o 3 The cryolite-based molten salt is electrolyzed at 965°C, with Fe-Ni alloy as the anode and molten aluminum as the cathode, and the cathode and anode current densities of the electrolysis process are controlled at 0.8A / cm 2 , Metal aluminum is obtained at the cathode, the mass purity of Al in metal aluminum is 96.78%, contains Ti 1.21%, Fe 1.95%, and oxygen is obtained at the anode. ...

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Abstract

The invention belongs to the field of metal smelting extraction, and particularly relates to a method for preparing Al-Ti-Fe alloy through thermal reduction of ilmenite in cryolite-based molten salt. The method comprises the following steps: using metal aluminium as a reducing agent, performing thermal reduction on the ilmenite in a cryolite-based molten salt medium for 0.5-6 h at 930-985 DEG C, separating alloy from molten salt to obtain the Al-Ti-Fe alloy and the Al2O3-enriched cryolite-based molten salt, wherein the Al-Ti-Fe alloy contains 59.44-83.55% of Al, 12.42-36.62% of Ti, 0.41-9.03% of Fe and 0.87-2.68% of Si in weight percentage. Compared with the prior art, that aluminum liquid is directly used for reducing solid ilmenite, the method has the advantages as follows: the required reaction temperature is greatly reduced, the energy consumption is reduced, the loss of the metal aluminium is avoided, and the reduced alloy product is high in purity.

Description

technical field [0001] The invention belongs to the field of metal smelting and extraction, in particular to a method for preparing Al-Ti-Fe alloy by thermite reduction of ilmenite in cryolite-based molten salt. Background technique [0002] China has very rich reserves of titanium resources, which are distributed in 20 provinces and autonomous regions across the country. Among them, ilmenite accounts for a large proportion, while rutile resources are seriously insufficient. Among the ilmenite reserves, most of them are rock mines, and a small part are placer mines. The weight percentages of the main chemical compositions of ilmenite from various parts of China are shown in Table 1. [0003] Table 1 The main chemical composition of ilmenite in various parts of China [0004] [0005] At present, the vast majority of ilmenite is used to prepare titanium-rich materials such as artificial rutile and high-titanium slag, and then the titanium-rich materials are used for ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B5/04C25C3/06
Inventor 石忠宁刘爱民谢开钰邓文涛李亮星关苹苹胡宪伟高炳亮王兆文
Owner NORTHEASTERN UNIV LIAONING
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