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Method for preparing ferro-titanium alloy based on thermite self-propagating gradient reduction and slag washing refining

A self-propagating technology for ferro-titanium alloys, which is applied in the field of ferro-titanium alloys based on thermite self-propagating gradient reduction and slag washing refining, can solve the problems of low titanium recovery rate and incomplete reduction, and reduce aluminum residues and energy consumption , Strengthen the effect of gold slag separation process

Active Publication Date: 2018-08-28
NORTHEASTERN UNIV LIAONING
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  • Application Information

AI Technical Summary

Problems solved by technology

But these patents exist TiO 2 Incomplete reduction, low recovery rate of titanium and other problems, based on these problems, the present invention proposes a new method of preparing ferro-titanium alloy using rutile or high-titanium slag as raw material, aluminothermic reduction-slag washing and refining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing ferro-titanium alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0030] (1) Thermite self-propagating gradient reduction

[0031] According to rutile, Fe 2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:1.46:0.92:0.19, and their particle sizes respectively satisfy: rutile≤3mm; Fe 2 o 3Powder ≤ 0.2mm; aluminum powder particle size ≤ 2mm; slagging agent particle size ≤ 0.2mm; divide the material into 5 batches, and the amount of aluminum in each batch is 1.20, 1.05, 1.0, 0.90 of the theoretical stoichiometric ratio of thermite self-propagating reaction , 0.85 times, and the total aluminum content of raw materials is 0.96 times of the theoretical chemical dosage ratio of thermite self-propagating reaction, and the weight of the first batch of materials accounts for 20% of the total amount of materials; The powder is ignited from the top of the mat...

Embodiment 2

[0037] A method for preparing ferro-titanium alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0038] (1) Thermite self-propagating gradient reduction

[0039] According to rutile, Fe 2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:1.6:0.98:0.23, and their particle sizes respectively satisfy: rutile≤3mm; Fe 2 o 3 Powder ≤ 0.2mm; aluminum powder particle size ≤ 2mm; slagging agent particle size ≤ 0.2mm; divide the material into 6 batches, and the amount of aluminum in each batch is 1.20, 1.1, 0.95, 0.90 of the theoretical stoichiometric ratio of thermite self-propagating reaction . Use magnesium powder to ignite from the top of the material to initiate a self-propagating reaction, and then add other batches of materials one after another until the reaction is complete to obtain a high-temperature melt;

[0040] (2) Insulate and melt the high-temperature melt through electr...

Embodiment 3

[0045] A method for preparing ferro-titanium alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0046] (1) Thermite self-propagating gradient reduction

[0047] According to rutile, Fe 2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:1.72:1.04:0.38, and their particle sizes respectively satisfy: rutile≤3mm; Fe 2 o 3 Powder ≤ 0.2mm; aluminum powder particle size 2mm; slagging agent particle size ≤ 0.2mm; divide the material into 7 batches, and the amount of aluminum in each batch is 1.20, 1.1, 1.0, 0.95, 1.20, 1.1, 1.0, 0.95, 0.925, 0.90, 0.875, 0.85 times, and the total aluminum content of raw materials is 0.95 times of the theoretical chemical dosage ratio of thermite self-propagating reaction, and the weight of the first batch of materials accounts for 22.2% of the total amount of materials; put the first batch of materials into the reaction In the furnace, magnesium powde...

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Abstract

Disclosed is a method for preparing a ferrotitanium alloy based on aluminothermic self-propagating gradient reduction and slagging refining, the method comprising: (1) carrying out aluminothermic self-propagating gradient reduction by means of a first method, wherein raw materials are divided into several batches, the first batch of materials is put into a reaction furnace and is ignited with a magnesium powder from the top of the materials so as to initiate a self-propagating reaction, and the other batches of materials are successively added until the reaction is complete; or carrying out aluminothermic self-propagating gradient reduction by means of a second method, wherein raw materials other than aluminum powder are mixed until uniform and added into a continuous mixer at a uniform flow rate, the aluminum powder is added into the continuous mixer at a flow rate decreasing at a gradient, and the uniformly mixed raw materials are simultaneously continuously introduced into the reaction furnace for an aluminothermic self-propagating reaction until all the materials are completely reacted; (2) smelting by means of maintaining a temperature to obtain an upper layer of an aluminum oxide-based slag and a lower layer of an alloy melt; (3) spraying a refining slag material into the lower layer of alloy melt for stirred slagging refining; and (4) cooling the refined high-temperature melt to room temperature, and removing the upper layer of slag to obtain the ferrotitanium alloy.

Description

technical field [0001] The invention relates to a method for preparing ferro-titanium alloy, in particular to a method for preparing ferro-titanium alloy based on aluminothermic self-propagating gradient reduction and slag washing and refining. Background technique [0002] Adding various metal and non-metal elements in the steelmaking process can create various special steels with different properties. However, because titanium has the characteristics of low specific gravity (only 4.5g / ml), high melting point (up to 1690°C), and easy oxidation, it is easy to oxidize and burn most of titanium on the molten steel surface when directly added in the steelmaking process. The loss is huge, and it is not easy to control. There are also a series of problems such as complex preparation process of single metal, high production cost, and high price. Therefore, titanium is not suitable to be directly added to molten steel in pure metal state during steelmaking. For this reason, metall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C33/04C22C1/06C22C1/02C22C35/00C22C38/02C22C38/06C22C38/14
CPCC22C1/02C22C1/06C22C14/00C22C33/04C22C35/00C22C35/005C22C38/02C22C38/06C22C38/14
Inventor 张廷安豆志河刘燕程楚张子木牛丽萍赵秋月吕国志傅大学张伟光
Owner NORTHEASTERN UNIV LIAONING
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