Method for removing impurities from polycrystalline silicon cast ingot leftovers
A polysilicon and edge leather technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as inability to process, waste of resources, etc., and achieve the effect of improving efficiency and high purity
Inactive Publication Date: 2015-03-25
JIANGXI SAI WEI LDK SOLAR HI TECH CO LTD
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0024] see figure 1 , a method for removing impurities from polysilicon ingot scraps in the first embodiment provided by the present invention. The method includes the following steps:
[0025] Step 101: Crushing the polysilicon ingot scraps to obtain granular polysilicon materials with a target size.
[0026] Since the polysilicon ingot will form a block or flake polysilicon ingot edge leather after squaring and head and tail removal, after the polysilicon ingot edge leather is crushed by a jaw crusher, granular polysilicon material, so that more embedded impurities are exposed on the surface of the polysilicon material. In this embodiment, the average value of the diameter target size of the polysilicon material is 5-50 mm. Specifically, as a preferred value, the average ...
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Abstract
The invention discloses a method for removing impurities from polycrystalline silicon cast ingot leftovers. The method comprises the following steps: crushing the polycrystalline silicon cast ingot leftovers to obtain a polycrystalline silicon material with a targeted size; soaking the polycrystalline silicon material with the targeted size in an acidic corrosive solution or an alkaline corrosive solution to remove the impurities such as silicon carbide, silicon nitride and metals from the surface of the polycrystalline silicon material; washing the soaked polycrystalline silicon material with pure water until the solution is neutral; drying the polycrystalline silicon material. According to the method, the sliced or blocky polycrystalline silicon leftovers are firstly crushed by a jaw crusher to obtain a granular polycrystalline silicon material, so that more embedded impurities can be exposed from the surface of the polycrystalline silicon material, and then the impurities are corroded by the acidic solution or the alkaline solution to remove the embedded impurities from the surface of the polycrystalline silicon material, and thus an impurity removal effect is achieved.
Description
technical field [0001] The invention relates to the field of polysilicon processing, in particular to a method for removing impurities from polysilicon ingot scraps. Background technique [0002] Due to the influence of polysilicon raw materials and ingot casting environment, some impurities such as silicon carbide and silicon nitride impurities are produced in the process of polysilicon ingot casting. After the ingot is squared and the head and tail are removed, a large amount of scrap material containing the above-mentioned impurities (silicon carbide, silicon nitride, etc.) will be produced. This part of the silicon material cannot be directly returned to the furnace due to the excessive content of impurities, and because the impurities are embedded in the In polysilicon ingot side leather, the current traditional recycling methods cannot achieve the purpose of removing impurities. [0003] At present, the traditional method of recovering polysilicon ingot edge leather g...
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IPC IPC(8): C01B33/037
Inventor 付红平章金兵刘渝龙彭也庆
Owner JIANGXI SAI WEI LDK SOLAR HI TECH CO LTD