Air separation device applied to impurities of silicon powder

Abstract

The invention relates to an air separation device applied to impurities of silicon powder, belongs to the field of the photovoltaic technology and aims to solve the problem of inconvenient removal ofimpurities in silicon powder in the prior art. The air separation device comprises a box body, wherein an air blower is arranged on the side of the box body; a feeding opening is formed in the top ofthe box body; a first sieving net, a second sieving net and a third sieving net are respectively arranged in the box body; a discharging opening is formed in one side away from the air blower in the box body; mesh numbers of the first sieving net, the second sieving net and the third sieving net are gradually increased; a powder collection box is arranged under each of the first sieving net, the second sieving net and the third sieving net. Through the air separation device applied to the impurities of silicon powder, the powder is filtered by the sieve nets with different pore sizes, so thatthe powder falls into different powder collection boxes according to different pore sizes; then the powder is artificially sorted; the sorting efficiency can be 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

There are impurities in the recycled crushed silicon, so it needs to be crushed, screened, pickled, dried to form powder, and the powder is then flotation for final purification. However, there are still some non- Silicon impurities, because the flotation process cannot remove fine impurities that are lighter than crushed powder, these impurities are difficult to manually select and the progress is slow, which has a certain impact on the recycling of silicon materials