Vacuum sublimation purifying method for high-purity arsenic and vacuum sublimation furnace thereof

Abstract

The invention relates to a vacuum sublimation purification method of high-purity arsenic, sublimating in vacuum sublimation sealed furnace, which comprises a heating furnace, a vacuum tank and a sublimation inner sleeve; wherein, a circular water jacket is arranged on the top of the vacuum tank; the vacuum tank under the circular water jacket is arranged in the heating furnace; the sublimation inner sleeve is arranged in the vacuum tank and comprises a bottom charging crucible, a middle high-purity arsenic implantation condenser and a top gas impurity condensing collector. A high boiling point high melting point element condensing ring is arranged between the charging crucible and the high-purity arsenic implantation condenser. A baffle is arranged between the high-purity arsenic implantation condenser and the gas impurity condensing collector. The gas impurity condensing collector is arranged in the circular water jacket on the top of the vacuum tank. The vacuum sublimation purification method of high-purity arsenic, sublimating in vacuum sublimation sealed furnace has the advantages of having rational structure, three segments of balance furnace temperatures, certain vacuum degree, precise temperature control, finished warming curve, uniform temperature field distribution, good repeatability, high product quality of the same arsenic after sublimating one time, good impurity separating condensing results, and low purification cost.

Description

technical field [0001] The invention relates to a nonferrous metal smelting and purification technology, in particular to a vacuum sublimation purification method for high-purity arsenic. The invention also relates to the use of a vacuum sublimation furnace in the purification method. Background technique [0002] Vacuum sublimation is one of the traditional special smelting technologies, but the structure and technical conditions of different metals are very different, especially for the vacuum sublimation purification of high-purity arsenic, it is very important whether the vacuum sublimation temperature field and temperature gradient change are reasonable . If the sublimation temperature is too high or the lateral temperature is uneven, a large amount of arsenic vapor will be generated, and the gas will rise faster. If the rising speed is too high, impurities will be entrained and the purification effect will be lost; if the longitudinal temperature distribution is unrea...

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Problems solved by technology

If the sublimation temperature is too high or the lateral temperature is uneven, a large amount of arsenic vapor will be generated, and the gas will rise faster. If the rising speed is too high, impurities will be entrained and the purification effect will be lost; if the longitudinal temperature distribution is unreasonable, secondary sublimation will occur and the rising speed will be accelerated; The temperature gradient distribution is unreasonable, the separation and condensation effect of impurities in arsenic is poor, and there is no purification effect, or the efficiency is low, the recovery rate is low, and the dead furnace will be caused in severe cases

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