CN-224227161-U - Feeding device of continuous distillation and purification crude indium system

Abstract

The utility model relates to a feeding device of a continuous distillation and purification crude indium system, and aims to solve the problems of low distillation efficiency, oxide film pollution and impurity accumulation in the traditional batch. The device comprises a distillation furnace, a raw material furnace and a conveying pipe, wherein the seamless connection between the normal pressure of the raw material furnace and the vacuum of the distillation furnace is realized through a pressure difference self-driven feeding structure, and the shutdown cooling is avoided. The bottom of the raw material furnace is provided with a suction trough, the top is provided with a filter ring for intercepting an oxidation film in real time, and by being matched with nitrogen purging, micro-positive pressure protection is formed, and nonmetallic impurities such as O, C are reduced. The double-circulation parallel mode enables the working time of the raw material furnace material and the working time of the distillation furnace to be overlapped, and the interval time of single batch is shortened. The energy consumption is reduced by the design of heating the material conveying pipe and heat preservation of the kettle body, and the service life of the crucible is prolonged by optimizing a circulating water system. The utility model realizes the whole process continuity of distillation-feeding-pretreatment, has high purity of finished indium and improved equipment utilization rate, and is suitable for the field of high-purity indium production of semiconductors, ITO targets and the like.

Inventors

• Jiang Jiechang
• GAO XUEFENG
• Lei Yundai
• CHEN YU
• ZHANG CHENG
• LEI CONG
• WU YI
• LI SHUAIBING

Assignees

• 东方电气(乐山)峨半高纯材料有限公司

Dates

Publication Date

20260512

Application Date

20250416

Claims (8)

1. 1. The feeding device of the continuous distillation and purification crude indium system is characterized by comprising a distillation furnace, a raw material furnace and a conveying pipe, wherein one end of the conveying pipe is arranged at the bottom of the raw material furnace, the other end of the conveying pipe is arranged in the distillation furnace, and a conveying valve is arranged in the middle of the conveying pipe; The raw material furnace comprises a raw material crucible, a kettle body and a kettle cover, wherein the kettle body is sleeved outside the raw material crucible, the kettle cover is provided with a vacuum pipeline and a nitrogen pipeline, and the kettle body is provided with a circulating water cooling system and a constant-temperature heating system.
2. 2. The feeding device of the continuous distillation and purification crude indium system as set forth in claim 1, wherein the circulating water cooling system is communicated with the kettle cover, and an inlet and an outlet of the circulating water cooling system are arranged on the kettle cover.
3. 3. The feeding device of the continuous distillation and purification crude indium system as set forth in claim 1, wherein a suction trough is arranged at the bottom of the raw material crucible, and the end of the material conveying pipe is arranged in the suction trough.
4. 4. A feeding device of a continuous distillation and purification crude indium system as set forth in claim 3, wherein a filter ring for filtering and isolating indium oxide film is arranged at the top of the suction trough, and the feed pipe is arranged through the filter ring.
5. 5. A feeding device of a continuous distillation and purification crude indium system as set forth in claim 1, wherein the vacuum pipeline and the nitrogen pipeline are both provided with control valves.
6. 6. A feeding device of a continuous distillation and purification crude indium system as set forth in claim 1, wherein the kettle cover is provided with a pressure gauge for detecting the pressure in the raw material furnace.
7. 7. A feed device of a continuous distillation purification system for crude indium according to claim 1, wherein the feed delivery conduit is provided with a heating system.
8. 8. The feeding device of the continuous distillation and purification crude indium system as set forth in claim 1, wherein the external vertical surface of the kettle is provided with an insulating layer.

Description

Feeding device of continuous distillation and purification crude indium system Technical Field The utility model relates to the technical field of crude indium purification by a distillation method, in particular to a feeding device of a continuous distillation crude indium purification system. Background Currently, the industrial purification of crude indium (purity 97% -99.7%) mainly adopts a batch vacuum distillation method, and the core defects are as follows: The intermittent operation efficiency is low, each batch of distillation needs to be subjected to a heating-distilling-cooling-cover opening impurity removing-filling process, and a single period takes 6-8 hours, wherein the cooling to the safe temperature (150 ℃) needs 2.5-3 hours, and the equipment utilization rate is insufficient. The oxide film is seriously polluted, the traditional feeding mode needs to be opened, the indium liquid is exposed in the air to form the oxide film, and the oxide film enters a distillation furnace along with the next batch of raw materials, so that the content of nonmetallic impurities in the finished indium is high, and the requirement of 6N-grade (99.9999%) high-purity indium is difficult to meet. And (3) the vicious circle of impurity accumulation, namely that distillation residues (containing high-boiling-point impurities such as Fe, cu and the like) are adhered to the furnace wall, manual mechanical cleaning is needed, the residual rate is more than 5%, the concentration gradient of the impurities in the subsequent batch is increased, and the total content of the impurities is increased. Limitations of prior art improvement attempts: While the partially semicontinuous feed design (e.g., twin furnace alternation) shortens the cooling time, the problems of oxide film contamination and impurity accumulation are not solved and the equipment complexity is greatly increased. Traditional filter equipment relies on the manual replacement filter screen after stopping, can't adapt to continuous production demand, and filtration efficiency is limited. Disclosure of utility model The utility model aims to overcome the defects of the prior art and provides a feeding device of a continuous distillation and purification crude indium system. The technical scheme adopted by the utility model is as follows: a feeding device of a continuous distillation and purification crude indium system comprises a distillation furnace, a raw material furnace and a material conveying pipe, wherein one end of the material conveying pipe is arranged at the bottom of the raw material furnace, one end of the material conveying pipe is arranged in the distillation furnace, and a material conveying valve is arranged in the middle of the material conveying pipe; The raw material furnace comprises a raw material crucible, a kettle body and a kettle cover, wherein the kettle body is sleeved outside the raw material crucible, the kettle cover is provided with a vacuum pipeline and a nitrogen pipeline, and the kettle body is provided with a circulating water cooling system and a constant-temperature heating system. Further, the circulating water cooling system is communicated with the kettle cover, and the circulating water inlet and the circulating water outlet are arranged on the kettle cover. Further, a suction trough is arranged at the bottom of the raw material crucible, and the end part of the conveying pipe is arranged in the suction trough. Further, a filter ring for filtering and isolating the indium oxide film is arranged at the top of the suction groove, and the conveying pipe penetrates through the filter ring. Further, the vacuum pipeline and the nitrogen pipeline are provided with control valves. Further, the kettle cover is provided with a pressure gauge for detecting the pressure in the raw material furnace. Further, the conveying pipe is provided with a heating system, and the vertical surface outside the kettle body is provided with a heat preservation layer. In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows: 1. The continuous production breaks through the limit of batch operation, and the pressure difference self-driven feeding is realized by utilizing the pressure difference between the vacuum of the distillation furnace and the normal pressure of the raw material furnace, and the feeding can be completed without pump body driving, thereby avoiding the discontinuous flow of the traditional cooling-uncovering-filling. The double circulation time staggers peaks, namely, the raw material furnace melting is parallel to the operation of the distillation furnace, the melting time is completely overlapped with the end of distillation (the residual 10% indium liquid), the idling time of the equipment is reduced, and the quasi-continuous production of discharging and preparing materials at the same time is realized. 2. The purity is guaranteed, namely the source intercepts oxid