Purification device and purification method for high-purity indium

Abstract

The invention provides a purification device for high-purity indium. The purification device comprises a quartz tube, a plurality of resistance heaters and a guide rail. Two ends of the quartz tube are fixed along the horizontal directions by the aid of a left flange sleeve and a right flange sleeve, and a graphite boat is arranged in the quartz tube; the resistance heaters are arranged on the outer side of the quartz tube and are sequentially arranged along the horizontal directions of the quartz tube, and cooling devices are arranged between the adjacent resistance heaters; the resistance heaters are fixed by the aid of the guide rail, and the guide rail is provided with a left stopper, a slide wire groove and a right stopper. Compared with the prior art, the purification device for thehigh-purity indium has the advantages that the resistance heaters are sequentially arranged on the outer side of the quartz tube along the horizontal directions, and accordingly zone melting and directional solidification can be simultaneously implemented; the temperatures of the resistance heaters are controlled, multistage heating can be implemented, uniform heating temperature gradient distribution and stable temperature fields can be guaranteed, accordingly, integral purification procedures are high in efficiency, and 6N-7N ultrahigh-purity indium production requirements can be met.

Description

technical field [0001] The invention relates to the technical field of purification of scattered metal materials, and more specifically relates to a high-purity indium purification device and method. Background technique [0002] Indium (In) has excellent physical and chemical properties, and is widely used in high-tech fields such as electronics, energy, optoelectronics, national defense, modern information industry, aerospace, etc., and its role in the national economy is becoming increasingly important. The improvement of the purity of indium can enhance its chemical, electrical, optical magnetic, and mechanical properties. With the development of high-tech industries in the fields of optoelectronics, aerospace, and atomic energy, the requirements for the purity of high-purity indium are also getting higher and higher. Ultra-high-purity indium is an important raw material for preparing indium phosphide semiconductors, and indium phosphide crystals have important applicati...

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Problems solved by technology

Among them, the vacuum distillation method has limited purification capacity, up to 5N, and high energy consumption; the zone smelting method has the disadvantages of long purification cycle, high energy consumption, and low production capacity; the ion exchange method has a purification capacity of up to 5N, and the process is complex , low efficiency, not suitable for industrial production; the low-halogen compound method has complicated process, poor controllability, and high cost; while the electrolysis method is most commonly used because of its short process flow and easy industrialization. At present, 4N indium in China basically uses electrolysis However, the electrolysis method involves the selection of electrolyte, cathode material and electrolytic cell, the process control is complicated, and the pollution is large. More importantly, the highest purity is 5N after multiple point solution and other special processes, which cannot meet the requirements of 6N~7N ultra-high purity. Production of High Purity Indium

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