Method for refining ferro-titanium on basis of aluminothermy self-propagating gradient reduction and wash heat

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: 2017-08-29
NORTHEASTERN UNIV
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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

The invention provides a method for refining ferro-titanium on basis of aluminothermy self-propagating gradient reduction and wash heat. The method comprises the steps that firstly, aluminothermy self-propagating gradient reduction is carried out, wherein according to the first manner, raw materials are divided into multiple batches, the materials in the first batch are put into a reaction furnace, magnesium powder is ignited from the top of a material so as to trigger the self-propagating reaction, and materials in other batches are added successively until the reaction is finished; according to the second manner, raw materials except for the aluminum powder are evenly mixed and are added into a continuous mixing machine with the uniform flow speed, meanwhile, the aluminum powder is added into the continuous mixing machine with the gradient progressively-decreasing flow sped, and the evenly-mixed raw materials are continuously introduced into a reaction furnace at the same time to be subject to the aluminothermy self-propagating gradient reduction until all the materials are subject to complete reaction; secondly, heat preservation smelting is carried out to obtain upper layer alumina-base slag and lower layer alloy melt; thirdly, refining slag is sprayed and blown into the lower layer alloy melt for stirring, slag washing and refining; fourthly, the high-temperature melt obtained after refining is cooled to the room temperature, and upper layer melting slag is removed so as to obtain the ferro-titanium.

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 Applications(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
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