Method and device for producing high-purity antimony

Abstract

The invention relates to a method and device for producing high-purity antimony, and belongs to the field of high-purity non-ferrous metal metallurgy in the smelting industry. The method comprises the following technological steps: 1, putting needle antimony in a crucible, arranging the crucible into a vacuum tank, starting a water cooling system and a vacuum pump, and controlling the vacuity below 13 Pa; 2, controlling the bottom temperature of the crucible to between 600 and 900 DEG C, the medium temperature to between 500 and 650 DEG C and the top temperature to between 350 and 450 DEG C, and preserving the temperature for 1 to 3 hours; and 3, continuously raising the temperature of the bottom of the crucible to between 650 and 900 DEG C, volatilizing the antimony through holes, contacting the antimony with a conical titanium plate, condensing the antimony on the titanium plate, preserving the temperature to completely volatilize the antimony, and remaining impurities with high boiling point such as lead in the crucible. The method and the device have high production speed, low energy consumption and simple equipment processing, and are suitable for requirement of mass production. A water jacket is adopted for cooling, so the condensing effect is good; and the impurities are not refluxed basically, the purity of products is high, and the production process has no pollution and no pollutant emission.

Description

technical field [0001] The invention relates to a method and a device for producing high-purity antimony, belonging to the field of high-purity nonferrous metal smelting in the smelting industry. Background technique [0002] High-purity antimony is mainly used in the semiconductor industry. It is a doping element for semiconductor silicon and germanium, and is the main raw material for semiconductor refrigeration chips. High-purity antimony is also alloyed with other metals and is widely used in the production of various flame retardants, enamel, glass, rubber, paint, pigments, ceramics, plastics, semiconductor components, fireworks, medicine and chemical industries. The antimony purity that can be achieved by traditional smelting technology is between 99% and 99.9%. [0003] The existing antimony metallurgy adopts traditional pyrometallurgy, which is large-scale and labor-intensive. For example, the Chinese patent CN03118341.7 entitled "A Method for Removing Arsenic and S...

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Problems solved by technology

[0003] The existing antimony metallurgy adopts traditional pyrometallurgy, which is large-scale and labor-intensive. For example, the Chinese patent CN03118341.7 entitled "A Method for Removing Arsenic and Selenium by Antimony Fire Refining", pyrometallurgy is subject to harsh production environment. Due to the influence of the purity of chemical reagents, the purity of its products can only meet the requirements of the national standard.

Chinese patent 200320115093.x titled "Vacuum distillation device for refining high-purity metals", because the distillation part of the design uses quartz tubes, it is very difficult to process into large sizes, and there is no forced cooling design in the condensation part, and the backflow of impurities is serious, which seriously affects Product purity, and the condensation tube is made of glass, which is easy to soften at high temperature, so this device is not suitable for the production of high-purity antimony

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