A silicon electrolytic cell for preparing high-purity silicon and its silicon preparation method

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...

AI Technical Summary

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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