Low-temperature metal lithium distillation equipment and distillation method thereof

Abstract

The invention relates to metal lithium distillation equipment, particularly to low-temperature metal lithium distillation equipment and a distillation method thereof. The low-temperature metal lithium distillation equipment comprises a distillation retort, a heating furnace, a heat-insulating body, a potassium-sodium slag collecting tank, a U-shaped vacuum tube, a control cabinet and a vacuum pump, wherein a distillation pool is arranged at the bottom of the distillation retort, and the distillation pool is provided with a discharge pipe, a feeding pipe and a slagging pipe from the top down; an umbrella-shaped reflow cover is mounted in the middle of the distillation retort; a temperature detector is arranged below the umbrella-shaped reflow cover; a cooling zone is arranged at the upper part of the distillation retort; the potassium-sodium collector is arranged at the upper part of the distillation retort; a cooling jacket is arranged at the exterior of the potassium-sodium collector; the potassium-sodium collector is in pipe connection with the potassium-sodium slag collecting tank arranged at the exterior of the distillation retort; the control cabinet is independently arranged at the exterior of the distillation retort. The distillation method comprises the steps of starting the heating furnace and the vacuum pump, and adding commercial grade metal lithium; materials inside the distillation pool are stirred for sufficient convection up and down; after three hours of distillation operation, high-purity battery grade metal lithium can be obtained; waste material is discharged, and next batch operation is continued.

Description

technical field [0001] The invention relates to metal lithium distillation equipment, in particular to a low-temperature metal lithium distillation equipment and a distillation method thereof. Background technique [0002] In recent years, with the continuous improvement of industrial-grade lithium metal production technology, all impurities except impurity metal sodium can be controlled within the range required by battery-grade metal lithium, so low-temperature lithium metal distillation equipment has emerged one after another. Its characteristic is that battery-grade metal lithium can be obtained only by removing the low-boiling-point impurity metal sodium in metal lithium under relatively low temperature conditions. It is not necessary to use the traditional high-temperature distillation method: first, metal lithium and low-boiling impurity metal potassium and sodium must be separated from high-boiling impurities (Ca, Mg, Al, Si, Fe and oxides, etc.) at the same time, an...

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Problems solved by technology

[0003] However, in order to realize the complete evaporation of impurity metal sodium, this kind of low-temperature distillation equipment needs to be equipped with a specific mechanical stirring device and corresponding dynamic sealing device, which cannot realize the full static sealing operation in the production process of the equipment, and the vacuum degree in the distillation production process is low and does not Stable, normal is 5×10 -2 -5pa, can't reach higher vacuum degree 5×10 stably -3 -5×10 -4 pa

Therefore, the quality of metal lithium products is difficult to guarantee and the stability is poor, and there is a safety hazard of seal leakage

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