Gallium purification device and method

Abstract

The invention relates to a gallium purification device and method. The device includes a cooling assembly, a seed crystal assembly, and a crystallization tank assembly. The crystallization tank assembly is located directly below the seed crystal assembly and is fixedly connected with the seed crystal assembly. The cooling assembly includes a cooling liquid storage tank , cooling jacket, cooling pipe connecting the cooling liquid storage tank and the cooling jacket; the crystallization tank assembly includes the feeding pipe, crystallization tank, discharge pipe and diaphragm; the crystallization tank includes the upper part of the crystallization tank and the lower part of the crystallization tank, and the diaphragm is separated from the crystallization Between the upper part of the tank and the lower part of the crystallization tank, the feeding pipe and the discharge pipe are connected with the crystallization tank; the angle θ formed between the upper part of the crystallization tank and the horizontal direction; the angle α formed between the lower part of the crystallization tank and the horizontal direction; The diameter of the horizontal section increases gradually from top to bottom, and the upper part of the crystallization tank is completely or partially covered by the cooling jacket. The gallium purification device and method can provide a temperature field under which the crystallization can be carried out, so that the gallium crystallization process can gradually proceed downward from the upper surface of the molten gallium.

Description

technical field [0001] The invention relates to the field of high-purity gallium preparation, in particular to a gallium purification device and method. Background technique [0002] High-purity gallium and its compounds are widely used in high-tech fields of modern equipment manufacturing such as petrochemical industry, solar photovoltaic system, national defense aerospace, signal image processing, and modern automobile industry. In addition, high-purity gallium is also widely used in electronic devices such as eutectic alloys, epitaxial wafers and optoelectronic devices. With the popularization of new concepts such as low-carbon economy and green energy, the application range of high-purity gallium in the above fields will expand, and the market demand for high-purity gallium will continue to increase. [0003] At present, the preparation methods of high-purity gallium mainly include crystallization, vacuum distillation, electrolytic refining, chemical extraction, thermal...

AI Technical Summary

Problems solved by technology

The innovations of the above-mentioned existing crystallization methods for purification of the prior art mainly focus on temperature field control and the continuous use of multiple methods, but no attention has been paid to the separation of crystallization mother liquor and crystal gallium after crystallization and the control of crystal growth direction; and The existing crystallization process adopts crystallization from the bottom, the final gallium crystal is on the bottom, and the crystallization mother liquor is on the top

[0010] In addition, due to the unevenness of the crystallization surface and the mother liquid of crystallization only accounts for about 15%, the solid-liquid separation is difficult; at present, the method of gradually extracting the upper liquid with a spoon is used in production to realize the solid-liquid separation, and the liquid is separated and then heated and melted Crystal emits high-purity gallium from the bottom

The above-mentioned process and operation have the following problems: (1) the separation of crystalline gallium and crystallization mother liquor is not complete; (2) the mother liquor that is not completely decomposed will cause pollution of high-purity gallium due to the enrichment of a large amount of impurities; (3) the whole system is difficult to Realize mechanized control; (4) The direction of crystal growth is difficult to control, and there are problems such as entrainment, resulting in low purification efficiency

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