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Method for continuously preparing metal samarium through 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, fast reaction speed and high reduction efficiency, and achieve the effects of low reduction reaction time, fast reaction speed and improved production efficiency

Active Publication Date: 2014-10-29
NORTHEASTERN UNIV
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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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  • Method for continuously preparing metal samarium through direct thermal reduction
  • Method for continuously preparing metal samarium through 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

The invention discloses a method for continuously preparing metal samarium through direct thermal reduction, and belongs to the technical field of nonferrous metallurgy. The preparation method comprises the following steps: Sm2O3, Al, CaO or MgO are mixed, wherein a reducing agent is Al, and can be replaced by an Si-Fe alloy with 75 mass% of Ca or Si; the batching and the pelletizing are performed; and then, the high-temperature reduction reaction is performed for pellets in flowing inert gas or nitrogen atmosphere; and finally, high-temperature samarium steam carried out by flowing inert carrier gases or nitrogen in a high-temperature reduction furnace is condensed to obtain the metal samarium. The method adopts the relative-vacuum manner, cancels a vacuum system and a vacuum reduction tank, realizes the continuous preparation of the metal samarium, shortens the reduction period, and improves the preparation efficiency; the recovery rate of the metal samarium can reach above 97%; as the energy consumption is obviously reduced, the method is a novel energy-saving green process for preparing the metal samarium with low cost; and the method is simple in operation, is simpler in equipment, is low in requirement, and reduces the equipment investment and the operation cost.

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 Applications(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
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