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A method for the continuous preparation of samarium metal by direct thermal reduction

A direct and metallic technology, applied in the field of continuous preparation of samarium metal by direct thermal reduction, can solve the problems of short life of the reduction tank, high production cost, fast reaction speed, etc., achieve low reduction reaction time, fast reaction speed, and improve production efficiency Effect

Active Publication Date: 2016-01-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention provides a method for continuous smelting of samarium by metallothermic reduction method under "relative vacuum" conditions, which realizes low-cost continuous production of samarium and solves the problem of high energy consumption in the traditional rare earth vacuum reduction-distillation method for preparing samarium metal , short life of reduction tank and high production cost; the method of the present invention has fast reaction speed, high reduction efficiency, and simultaneously realizes continuous production of samarium

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  • A method for the continuous preparation of samarium metal by direct thermal reduction
  • A method for the continuous preparation of samarium metal by direct thermal reduction

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Experimental program
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Effect test

Embodiment 1

[0040] The method for continuously preparing samarium metal by direct thermal reduction specifically comprises the following steps:

[0041] Step 1, ingredients into balls:

[0042] Ingredients: Sm 2 o 3 : Al according to the molar ratio of 1: 2.2 ingredients;

[0043] Pelletizing: Mix the ingredients evenly, and use a roller press at 100kg / cm 2 Pressed into spherical pellets under pressure;

[0044] Step 2, high temperature continuous reduction of pellets:

[0045] In a flowing argon gas atmosphere, the argon flow rate is 6.0m 3 / h, the pellets are continuously fed into the intermediate frequency induction furnace, the reduction temperature is 1400°C, and the reduction time is 60mins to obtain high-temperature samarium vapor, which is mixed with argon to form a high-temperature mixed gas, and the reduction slag is continuously discharged from the intermediate frequency induction furnace ;

[0046] Step 3, condensation of high temperature samarium vapor:

[0047] The h...

Embodiment 2

[0049] The method for continuously preparing samarium metal by direct thermal reduction specifically comprises the following steps:

[0050] Step 1, ingredients into balls:

[0051] Ingredients: Sm 2 o 3 : Al according to the molar ratio of 1: 2.0 ingredients;

[0052] Pelletizing: Mix the ingredients evenly, and use a roller press at 150kg / cm 2 Pressed into spherical pellets under pressure;

[0053] Step 2, high temperature continuous reduction of pellets:

[0054] In a flowing argon gas flow atmosphere, the argon flow rate is 4.5m 3 / h, the pellets are continuously fed into the intermediate frequency induction furnace, the reduction temperature is 1500°C, and the reduction time is 40 minutes to obtain high-temperature samarium vapor, which is mixed with argon to form a high-temperature mixed gas, and the reduction slag is continuously discharged from the intermediate frequency induction furnace ;

[0055] Step 3, condensation of high temperature samarium vapor:

[00...

Embodiment 3

[0058] The method for continuously preparing samarium metal by direct thermal reduction specifically comprises the following steps:

[0059] Step 1, ingredients into balls:

[0060] Ingredients: Sm 2 o 3 : Al according to the molar ratio of 1: 2.2 ingredients;

[0061] Pelletizing: Mix the ingredients evenly, and use a roller press at 250kg / cm 2 Pressed into spherical pellets under pressure;

[0062] Step 2, high temperature continuous reduction of pellets:

[0063] In a flowing argon gas flow atmosphere, the argon flow rate is 4.0m 3 / h, the pellets are continuously fed into the intermediate frequency induction furnace, the reduction temperature is 1600°C, and the reduction time is 30 minutes to obtain high-temperature samarium vapor, which is mixed with argon to form a high-temperature mixed gas, and the reduction slag is continuously discharged from the intermediate frequency induction furnace ;

[0064] Step 3, condensation of high temperature samarium vapor:

[00...

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Abstract

A method for continuously preparing samarium metal by direct thermal reduction, belonging to the technical field of non-ferrous metal metallurgy. The preparation method of the present invention specifically includes: mixing Sm2O3, Al, CaO or MgO, where the reducing agent is Al, which can be replaced by Ca or a Si-Fe alloy with a Si mass content of 75%. After batching, the pellets are pelletized. The high-temperature reduction reaction is carried out in a flowing inert gas or nitrogen atmosphere, and finally the high-temperature samarium vapor carried out by the flowing inert carrier gas or nitrogen in the high-temperature reduction furnace is condensed to obtain samarium metal. The method of the present invention adopts "relative vacuum" means, cancels the vacuum system and the vacuum reduction tank, realizes the continuous production of samarium metal, shortens the reduction cycle, improves production efficiency, and the recovery rate of samarium metal can reach more than 97%; it can It is a new, energy-saving and green process for preparing samarium metal at low cost, with significantly lower consumption. It is also simple to operate, has simpler equipment and lower requirements, reducing equipment investment and operating costs.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, in particular to a method for continuously preparing samarium metal by direct thermal reduction. Background technique [0002] Samarium (Sm) metal is one of the important products of light rare earth metals, which has special physical and chemical properties. It has a melting point of 1074°C, a boiling point of 1794°C, a hardness of 45-65HB, and a density of 7.536g / ml. It has good ductility and is easy to process into materials. Samarium has strong metal chemistry, and under certain external conditions, it is easy to interact with oxygen, hydrogen, nitrogen, sulfur, carbon, etc. to form corresponding compounds (Sm 2 o 3 , SmH 3 , SmN, etc.), can form alloys with certain metals (such as SmCo, etc.), and can form different metal salts (SmCl 3 , Sm 2 (SO 4 ) 3 , SmNO 3 Wait). For example, the above metal samarium compounds, alloys and salts all have good practical techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B5/04
Inventor 张廷安豆志河张子木刘燕吕国志赵秋月牛丽萍傅大学
Owner NORTHEASTERN UNIV LIAONING
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