Silicon purification method
A purification method and technology for silicon materials, applied in the field of silicon materials, can solve the problems of increasing the cost of silicon material purification, increasing the cost of solar energy conversion, reducing the efficiency of solar power generation, etc., and achieving the effects of improving purity, satisfying purity requirements and improving economic benefits.
Inactive Publication Date: 2018-01-16
安徽爱森能源有限公司
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Problems solved by technology
[0002] With the development of my country's economy, the utilization and development of energy has entered a new era of innovation. Solar power generation has become a new energy technology. Solar power generation includes photothermal power generation and photovoltaic power generation, but the key to this new type of solar power generation is solar cells. , using solar cells for energy conversion and storage, which requires a large number of silicon panels, and the purity of silicon in panels is generally high, but the requirements for silicon purification technology are relatively high, which seriously increases the efficiency of silicon material purification. cost, which greatly increases the cost of solar energy conversion and reduces the efficiency of solar power generation
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Embodiment Construction
[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below.
[0019] A method for purifying silicon, the process for purifying comprises the following steps:
[0020] (1) Cleaning the surface of the silicon material. The surface of the silicon material to be purified is cleaned with a sodium bicarbonate solution, and then placed in a cool and ventilated place for surface drying, and the cool and dry time is set to 1h.
[0021] (2) Heating the silicon material, putting the material to be purified into a closed purification box and then evacuating it, when the air pressure in the purification box is reduced to 10 -2 At Pa, the silicon material is heated until the silicon material is melted into a silicon material melt.
[0022] (3) Purification of silicon material, when the surface temperature of the silicon material melt reaches 850°C, and the temperatu...
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The invention discloses a silicon purification method which is characterized in that the silicon purification method comprises the following steps: (1) surface cleaning of a silicon material, to be more specific, the surface of the to-be-purified silicon material is cleaned by a sodium bicarbonate solution, and the silicon material is placed in a cool and ventilated place for surface drying; (2) heating of the silicon material, to be more specific, the to-be-purified silicon material is put into a closed purification box for vacuating; (3) purifying of the silicon material, the surface temperature of the silicon material melt reaches 830-850 DEG C, the silicon material is purified by precipitation, a precipitated high-purity silicon crystal is slowly heated, and the rate of heating is adjusted as the amount of the crystal is increased to form and collect the crystals; and (4) cooling warming-up treatment for improvement of the purity of silicon, the silicon material can better meet thesilicon purity requirements of solar cell panels, the cost of purification is reduced, and economic efficiency of solar power generation is improved.
Description
technical field [0001] The invention relates to the technical field of silicon materials, in particular to the application in the purification treatment of silicon materials, and in particular to a silicon purification method. Background technique [0002] With the development of my country's economy, the utilization and development of energy has entered a new era of innovation. Solar power generation has become a new energy technology. Solar power generation includes photothermal power generation and photovoltaic power generation, but the key to this new type of solar power generation is solar cells. , using solar cells for energy conversion and storage, which requires a large number of silicon panels, and the purity of silicon in panels is generally high, but the requirements for silicon purification technology are relatively high, which seriously increases the efficiency of silicon material purification. The cost has greatly increased the cost of solar energy conversion and...
Claims
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IPC IPC(8): C01B33/037
Inventor 俞豪威梁庭卫
Owner 安徽爱森能源有限公司