Silicon material selection device and selection method

Abstract

The invention relates to a silicon material selection device, and belongs to the technical field of photovoltaics. By means of the device, the problem that in the prior art, the silicon material selection purity is low is solved. The silicon material selection device comprises a rack and a box, wherein a feeding hopper is arranged on the box, a first magnetic roller and a power device for drivingthe first magnetic roller to rotate are arranged in the box, the first magnetic roller rotates anticlockwise, the first magnetic roller comprises a first rotating cylinder and an arc-shaped first magnetic system arranged on the left side of the magnetic roller, a silicon material collecting bucket is arranged on the left side of a portion under the first magnetic roller, a first impurity collection bucket is arranged on the right side of the portion under the first magnetic roller, a scraping board is arranged on the portion, on the right side of the first magnetic roller, located above the first impurity collection bucket, an impurity collection roller is arranged over a portion on the right side of the first magnetic roller, and the impurity collection roller is an electromagnet in a cylinder shape. According to the silicon material selection device, through the first magnetic roller, primary selection is conducted, and through a material falling board, secondary selection is conducted, so that selected recovered silicon material magnetic impurities are minimum, and the purity of a silicon material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, and relates to a silicon material selection device, in particular to a silicon material selection device for removing metal impurities. Background technique [0002] Solar power generation is an important means for human beings to utilize solar energy, and solar cells are the main device to realize photoelectric conversion. The photoelectric conversion efficiency of solar cells determines the utilization conversion rate of solar energy. In recent years, the output and installed capacity of solar cells in the world have been developing rapidly at a rate of 30% every year. At present, the global cumulative installed capacity is 25.4GW, and it is expected that the global installed capacity will reach 278GW by 2020. [0003] In recent years, with the rapid development of the silicon solar energy industry, the market competition has become more and more fierce. In order to reduce the production...

AI Technical Summary

Problems solved by technology

In the prior art, most of the dry-type multi-roller magnetic separators are used to select the metal impurities in the silicon material. However, during the selection process, if the magnetism of the magnetic roller is strong, the impurities on the magnetic roller cannot be removed, and the magnetism of the magnetic roller is weak. , which will affect the selection efficiency, resulting in unclean selection of magnetic metal impurities

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