Preparation method of ytterbium metal

A metal, ytterbium oxide technology, applied in the field of metallurgy, can solve problems such as difficulty in purification

Active Publication Date: 2019-03-08
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The melting point of metal ytterbium is 842°C, and the vapor pressure during melting is about 19 mmHg. Due to the low melting point and high vapor pressure, the purification method of metal ytterbium generally adopts distillation (sublimation) method, but the traditional preparation method is difficult to combine metal ytterbium with Separation of metals with low melting point and high vapor pressure, such as alkali metals and alkaline earth metals, is extremely difficult to purify

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  • Preparation method of ytterbium metal

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[0020] The method for preparing ytterbium metal according to an embodiment of the present invention includes the following steps S1-S2:

[0021] S1. Mix ytterbium oxide and reducing agent in a vacuum higher than 5×10 -2 Under the condition of Pa, heat up to the first temperature at a speed of 10-15 °C / min and keep it warm until the vacuum degree is stable, then heat up to the second temperature at a speed of 2.5-10 °C / min and keep it warm for more than 30 min to carry out the reduction reaction. The obtained components are reduced products; wherein, the first temperature is 200-500°C, and the second temperature is 700-1000°C.

[0022] S2, reduce the product in a vacuum higher than 5 × 10 -4 Under the condition of Pa, the temperature is raised to the third temperature and kept for 5 to 20 hours, then the temperature is raised to the fourth temperature and the components evaporated during the time period from the third temperature to the fourth temperature are collected to obta...

Embodiment 1

[0035] After making 1.6kg of metal lanthanum with a relative purity greater than 99.99% into lanthanum scrap, mix it with 1.9kg of ytterbium oxide with a relative purity greater than 99.995%, press it into blocks, and place it in a vacuum furnace at a vacuum degree higher than 5×10 -2 Under the condition of Pa, heat up from room temperature to 300°C at 10°C / min, keep warm until the vacuum degree is stable, then continue to heat up to 950°C at a speed of 5°C / min, keep warm for 60min, collect the evaporated components during the whole process, and obtain Reduction product.

[0036]Place the reduced product in a vacuum furnace at a vacuum degree higher than 5×10 -4 Under Pa conditions, first raise the temperature to 500°C and keep it warm for 5 hours to diffuse some impurities to the surface or evaporate them. Replace the collection bucket and remove the surface impurities, then continue to heat up to 750°C at a rate of 5°C / min to evaporate metal ytterbium. and collected to obta...

Embodiment 2

[0040] After making 2.4kg of metal lanthanum with a relative purity greater than 99.99% into lanthanum scrap, mix it with 2.85kg of ytterbium oxide with a relative purity greater than 99.995%, press it into a block, and place it in a vacuum furnace at a vacuum degree higher than 5×10 -2 Under the condition of Pa, heat up from room temperature to 300°C at 10°C / min, keep warm until the vacuum degree is stable, then continue to heat up to 850°C at a speed of 5°C / min, keep warm for 120min, collect the evaporated components during the whole process, and obtain Reduction product.

[0041] Place the reduced product in a vacuum furnace at a vacuum degree higher than 5×10 -4 Under Pa conditions, first raise the temperature to 500°C and keep it warm for 10 hours to diffuse some impurities to the surface or evaporate them. Replace the collection bucket and remove the surface impurities, then continue to heat up to 750°C at a speed of 5°C / min to evaporate metal ytterbium. and collected t...

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Abstract

The invention relates to a preparation of ytterbium metal. The preparation method comprises the following steps that ytterbium oxide and a reducing agent are mixed, the temperature is increased to thefirst temperature at the speed of 10-15 DEG C/min under the condition that the vacuum degree is higher than 5*10<-2> Pa, heat preservation is conducted till the vacuum degree is stable, then the temperature is increased to the second temperature at the speed of 2.5-10 DEG C/min, heat preservation is conducted for 30 min or above, a reduction reaction is conducted, evaporated components are collected, and thus a reduced product is obtained; and the reduced product is heated up to the third temperature under the condition that the vacuum degree is higher than 5*10<-4> Pa, heat preservation is conducted for 5-20 h, then the temperature is increased to the fourth temperature, components evaporated in the time period that the third temperature is increased to the fourth temperature are collected, and thus the ytterbium metal is obtained. The preparation method is divided into the two steps of low-temperature reduction and distillation impurity-removing to be conducted respectively so as toachieve the purpose of simultaneously removing rare earth impurities and part of non-rare earth impurities, and the ytterbium metal with high purity is prepared accordingly.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing metal ytterbium. Background technique [0002] Metal ytterbium is silver-gray, ductile, and soft in texture. At room temperature, ytterbium can be slowly oxidized by air and water. Ytterbium is similar to samarium and europium, and belongs to variable-valence rare earths. In addition to being usually positive trivalent, it can also be positive divalent. The rare earth metal ytterbium is a heavy rare earth element, and is mainly used as a functional material and additive in shielding coating materials, grid dielectric materials, pressure sensor materials, magnetostrictive materials, laser materials, and high-tech alloy additive materials. In recent years, with the high-tech development of integrated circuits, optical fiber communications and laser lights, the application of rare earth ytterbium has become more and more extensive. For example, computer n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B5/04C22B9/02
CPCC22B5/04C22B9/02C22B59/00Y02P10/20
Inventor 刘华黄培黄美松王志坚樊玉川文康马小波邓月华杨露辉傅臻
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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