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Vacuum smelting furnace and method for preparing high-purity metal ytterbium through one-time continuous reduction distillation

A vacuum smelting and metal technology, which is applied in the field of vacuum smelting furnace and one-time continuous reduction distillation to prepare high-purity metal ytterbium, which can solve the problems of high power consumption for secondary distillation, reduction of metal ytterbium yield, loss of rare earth metals, etc., and achieve overflow rate Low, lanthanum impurity reduction, effect of removing impurity entrainment

Active Publication Date: 2020-07-17
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Distillation and purification of metal ytterbium Due to the high vapor pressure of ytterbium, rare earth metals will be lost during metal distillation and purification, which reduces the yield of metal ytterbium
The power consumption of the second distillation will also increase

Method used

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  • Vacuum smelting furnace and method for preparing high-purity metal ytterbium through one-time continuous reduction distillation
  • Vacuum smelting furnace and method for preparing high-purity metal ytterbium through one-time continuous reduction distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0036]High-purity ytterbium oxide and lanthanum chips are mixed in a certain proportion, compacted, and loaded into a vacuum smelting furnace. Titanium plates with Ф6 round holes are respectively installed on the transition section between the material block and the metal receiver, and the receiver is sealed, and the vacuum is pumped to 10Pa. Heat up for 30 minutes to 500°C, hold for 120 minutes, heat up to 780°C, hold for 3 hours, heat up to 900°C for 30 minutes, hold for 3 hours, heat up to 1150°C for 30 minutes, hold for 7 hours; power off for 120 minutes to cool down to 600°C, turn off the mechanical pump, and flush with argon Let cool to room temperature.

[0037] The metal samples were taken out, and the compositional analysis results were as follows:

[0038] Y<0.00050, La0.00070, Ce0.00050, Pr<0.00050, Nd<0.00050, Sm<0.00050, Eu0.0010, Gd<0.00050, Tb<0.00050, Dy<0.00050, Ho<0.00050, Er<0.00050, Tm 0.00050, Lu<0.00050, Yb / RE99.99.

[0039] There are many kinds of rare...

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Abstract

The invention discloses a method for preparing high-purity metal ytterbium through one-time continuous reduction distillation. The method comprises the steps that a vacuum smelting furnace is adopted,a basic raw material pressing block is placed in a metal crucible, and titanium and molybdenum-manufactured double-plug plates are arranged at different temperature transition sections of a distillation system; a combustion chamber of the vacuum smelting furnace is vacuumized to be 10 Pa or below, current delivery and heating are carried out, the heating rate, and thermal insulation time are controlled for heating, metal lanthanum is used for thermal reduction on high-purity ytterbium oxide, a generated metal ytterbium is condensed in a receiver after being distilled by the double-plug plates, a diffusion pump is closed after distillation is completed, argon is filled, and cooling is conducted to a normal temperature according to the set cooling speed and time. The invention further discloses the vacuum smelting furnace. According to the method, stable operation of a distillation process is ensured, the metal ytterbium is low in overflow rate, the rare earth yield is high, impurity entrainment is effectively removed, and lanthanum impurities in the metal ytterbium are greatly reduced.

Description

technical field [0001] The invention belongs to vacuum metallurgical purification technology, in particular to a vacuum smelting furnace and a method for preparing high-purity metal ytterbium by one continuous reduction distillation. Background technique [0002] Vacuum smelting furnaces are usually used to smelt alloy steel, and are generally composed of a furnace, an electric heating device, a sealed furnace shell, a vacuum system, a power supply system, and a temperature control system. The sealed furnace shell is welded with carbon steel or stainless steel, and the joint surface of the detachable parts is sealed with a vacuum sealing material; in order to prevent the deformation of the furnace shell after heating and the deterioration of the sealing material, the furnace shell is generally cooled by water or air cooling. The furnace is located in a sealed furnace shell, which is equipped with different types of heating elements, such as resistors, induction coils, electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B9/02C22B9/04C22B5/04
CPCC22B59/00C22B9/02C22B9/04C22B5/04
Inventor 张先恒刘玉宝赵二雄苗旭晨陈国华刘冉
Owner BAOTOU RES INST OF RARE EARTHS
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