Vacuum distillation purification furnace for metal lithium

Abstract

The invention relates to a device for purifying metal lithium, in particular to a vacuum distillation purification furnace for the metal lithium. The vacuum distillation purification furnace comprises an adjustable heating furnace body and a furnace cover, wherein a heat preservation layer is sleeved on the periphery of the furnace body; and a condensation layer is sleeved on the furnace cover; the furnace cover is positioned on the upper top end of the furnace body; the periphery at the bottom of the furnace cover is provided with an evaporant condensation groove; the evaporant condensation groove is connected with an impurity collector; the lower end of the furnace cover is combined with the upper end of the furnace body in a sealing way; the upper side end of the furnace body is connected with a closed lithium liquid inlet; the lower side end of the furnace body is provided with a closely connected lithium liquid outlet; the lithium liquid outlet is connected with a lithium liquid collector; a distillation groove which has gradually reduced radiuses and is of a spiral adjustable segmental temperature-variable electrode is arranged in the furnace body; the highest position of the distillation groove is connected with the lithium liquid inlet; and the lowest position is connected with the lithium liquid outlet. The problem of distilling the lithium liquid at low temperature and low pressure is solved, so that a resistance heating element is not easily corroded by reaction materials; and therefore, service life is prolonged; purification efficiency is improved; and cost is reduced.

Description

technical field [0001] The invention relates to a device for purifying metal lithium, in particular to a vacuum distillation purification furnace for metal lithium. Background technique [0002] At present, high-purity metal lithium is usually first extracted by electrolysis to obtain industrial-grade lithium metal with a purity of 96-99%, and then the impurity elements metal sodium, potassium and other impurities are separated from metal lithium by distillation, and the industrial-grade crude Lithium is purified into high-purity metal lithium with a purity of 99.9% to 99.99%. The mechanism of this method is that various metal elements have different vapor pressures at a certain temperature, and the difference in evaporation rate and condensation rate is used. It can separate impurity elements (mainly metal sodium, potassium and other heavy metals) from metal lithium, so as to achieve the purpose of purification. [0003] The most important equipment in the above process me...

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Problems solved by technology

[0003] The most important equipment in the above process method is the vacuum distillation and purification furnace for metal lithium. The current metal lithium vacuum distillation and purification furnace mostly uses the central electrode heating method to distill and separate the lithium liquid. The distillation and purification furnace with this structure has a certain thickness. The lithium liquid is all around the electrodes. During vacuum distillation, the liquid at the bottom of the lithium liquid will produce volatile impurity evaporation gas under the action of vacuum pressure and temperature. It needs to overcome a large hydraulic pressure to evaporate and rise to the condensation set at a high place. On the collector, the vacuum distillation purification furnace for metal lithium requires high vacuum pressure and high temperature. Due to the small evaporation area of ​​lithium liquid in this kind of purification furnace, it needs a lot of power to complete the evaporation of lithium liquid. Under high temperature conditions, the resistance The heating element is easily corroded by the reaction material, resulting in unstable electric parameters of the electric heating element, short life, low productivity and high cost

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