Silicon electrolytic bath for preparing high-purity silicon and silicon preparation method

An electrolytic cell and high-purity technology, applied in the field of electrolytic cells, can solve problems such as molten salt atmosphere corrosion and impact on continuous production, and achieve the effects of improving purity, improving automation and mechanization, and increasing service life

Active Publication Date: 2017-11-14
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Application Information

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Problems solved by technology

At present, the preparation of crystalline silicon by molten salt electrolysis has achieved phased research results, but there are certain difficulties in scale and large-scale promotion, mainly reflected in molten salt atmosphere corrosion, cathode plate preheating, crystalline silicon preparation, crystalline silicon There are problems affecting continuous production in cooling and other processes

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  • Silicon electrolytic bath for preparing high-purity silicon and silicon preparation method
  • Silicon electrolytic bath for preparing high-purity silicon and silicon preparation method

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the examples, but the protection scope of the present invention is not limited by the examples.

[0024] As shown in the figure, a silicon electrolytic cell for preparing high-purity silicon according to the present invention includes three operating chambers: a cathode preheating chamber 23, an intermediate operating chamber 24, and a crystalline silicon cooling chamber 26 arranged on the same level. Folding doors 7 are arranged between the operating chambers, and an electrolytic reaction chamber 25 communicating with the middle operating chamber 24 is arranged below. A molten electrolyte 3 is provided in the electrolysis reaction chamber 25 , and an anode device 6 is provided in the molten electrolyte 3 . The anode device 6 is used to fix the anode pole piece 22 . The anode pole piece 22 is connected to the positive pole of the DC power supply system through the anode connection 9 . A ...

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Abstract

The invention relates to a silicon electrolytic bath for preparing high-purity silicon and a silicon preparation method. The silicon electrolytic bath comprises three operation chambers, that is, the cathode pre-heating chamber, the middle operation chamber and the crystalline silicon cooling chamber which are arranged on the same layer, a folding door is arranged between every two adjacent operation chambers, and an electrolytic reaction chamber communicating with the middle operation chamber is arranged under the middle operation chamber. The electrolytic reaction chamber is internally provided with a fused electrolyte, an anode device is arranged in the fused electrolyte and used for fixing an anode pole piece, and the anode pole piece is connected with a positive pole of a direct current supply system through an anode connection wire. The upper portions inside the cathode pre-heating chamber, the middle operation chamber and the crystalline silicon cooling chamber are provided with tracks, the tracks are provided with movable cathode moving devices, cathode buses are arranged on the cathode moving devices, the lower portions of the cathode buses are connected with cathode devices through cathode guide rods, and the cathode devices are used for fixing cathode pole pieces. The silicon electrolytic bath for preparing the high-purity silicon, and the silicon preparation method have the advantages that the process is simple, operation is convenient, the mechanization degree and the automation degree are high, and environmental protection and energy saving are achieved.

Description

technical field [0001] The invention relates to an electrolytic cell, in particular to a silicon electrolytic cell for preparing high-purity silicon by molten salt electrolysis and a silicon preparation method thereof. Background technique [0002] Silicon is the most abundant semiconductor element on the earth's crust, and is an important raw material for the preparation of semiconductors and new composite materials. Crystalline silicon has special physical properties in terms of light and electricity, making it widely used in metallurgy, chemical industry, microelectronics, photovoltaics, solar energy and other fields. Its output and consumption also indicate the development level of a country's electronics industry. Crystalline silicon can be divided into metallurgical grade, solar grade and electronic grade according to its purity. Metallurgical grade silicon is the raw material for producing solar grade and electronic grade silicon. Crystalline silicon with different pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/12C25B15/00
CPCC25B11/02C25B15/00C25B1/33C25B9/30
Inventor 周东方白斌刘伟付松
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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