Silicon melt external refining device and method

An out-of-furnace refining and silicon melt technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of insufficient stirring of silicon melt, affecting product quality, uneven composition, etc., and achieves easy large-scale Industrial application, improvement of silicon product quality, and simple equipment

Pending Publication Date: 2017-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, the bottom blowing refining of one nozzle will not only cause insufficient stirring of the silicon melt, uneven composition of the silicon melt, thus affecting product quality, but also cause longer refining time and more heat loss, which will eventually affect the output and increase energy consumption

Method used

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  • Silicon melt external refining device and method
  • Silicon melt external refining device and method
  • Silicon melt external refining device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 and 2 As shown, in the device for refining silicon melt outside the furnace, two gas nozzles 3 are arranged at the bottom 2 of the ladle, and the included angle θ between the center of the circles of the two nozzles 3 and the center of the ladle bottom is 120° (satisfying: 90°≤ θ≤180°); the distance 1 between the center of the two nozzles 3 and the center of the bottom of the ladle is 0.5R, and the radius r of the nozzle 3 is 0.2R, satisfying in

[0027] The application method of the device for refining silicon melt outside the furnace, its specific steps are as follows:

[0028] Step 1, set two gas nozzles 3 at the bottom of the bag 2 and continuously feed compressed air (the flow rate of the compressed air is 8m 3 / h), put the silicon melt smelted in the submerged arc furnace into the ladle (mainly including the following mass percentage components: 96% Si, 0.8% Al, 3% Ca), and release the silicon melt in the ladle The increase of SiO with a ma...

Embodiment 2

[0032] Such as image 3 As shown, in the device for refining silicon melt outside the furnace, two gas nozzles 3 are arranged at the bottom 2 of the ladle, and the included angle θ between the center of the circles of the two nozzles 3 and the center of the ladle bottom is 90° (satisfying: 90°≤ θ≤180°); the distance 1 between the center of the two nozzles 3 and the center of the bottom of the ladle is 0.3R, and the radius r of the nozzle 3 is 0.2R, satisfying in

[0033] The application method of the device for refining silicon melt outside the furnace, its specific steps are as follows:

[0034] Step 1, set two gas nozzles 3 at the bottom of the bag 2 and continuously feed compressed air (the flow rate of the compressed air is 8m 3 / h), put the silicon melt smelted in the submerged arc furnace into the ladle (mainly including the following mass percentage components: 96% Si, 0.8% Al, 3% Ca), and release the silicon melt in the ladle The increase of NaO and CaF with a ma...

Embodiment 3

[0038] Such as Figure 4 As shown in the device for refining silicon melt outside the furnace, two gas nozzles 3 are arranged at the bottom 2 of the ladle, and the included angle θ between the centers of the two nozzles 3 and the center of the ladle bottom is 180° (satisfying: 90°≤ θ≤180°); the distance 1 between the center of the two nozzles 3 and the center of the bottom of the ladle is 0.7R, and the radius r of the nozzle 3 is 0.2R, satisfying in

[0039] The application method of the device for refining silicon melt outside the furnace, its specific steps are as follows:

[0040] Step 1. Set two gas nozzles 3 at the bottom of the bag 2 to continuously feed compressed air (the flow rate of the compressed air is 12m 3 / h), put the silicon melt smelted in the submerged arc furnace into the ladle (mainly including the following mass percentage components: 96% Si, 0.8% Al, 3% Ca), and release the silicon melt in the ladle The increase, adding the mass ratio of CaO:MgO:CaF...

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Abstract

The invention relates to a silicon melt external refining device and method and belongs to the technical field of industrial silicon purification. A ladle bottom of the device is equipped with two gas nozzles, and an included angle theta between each nozzle circle center and a ladle bottom circle center meets a relationship of 90 degrees<=theta<=180 degrees; and the distance between each nozzle circle center and the ladle bottom circle center, nozzle radius r and ladle bottom radius R meet a relationship shown in the description. Compressed air or refining gas is continuously introduced into the two gas nozzles arranged on the ladle bottom; silicon melt which is smelted from a submerged arc furnace is placed into a ladle; with the increase of silicon melt discharged from the ladle, refining agents are added and the refining gas component and flow are adjusted; external blowing and slagging refining are performed; dross on the surface of the silicon melt is skimmed; and pouring is performed on the silicon melt to obtain a high-purification industrial silicon product. The device and method provided by the invention ensure the dynamic conditions of the silicon melt in the specially-made ladle, eliminate stirring dead angles, and effectively increase qualities of the silicon product.

Description

technical field [0001] The invention relates to a device and method for refining silicon melt outside a furnace, and belongs to the technical field of purifying industrial silicon. Background technique [0002] The industrial silicon industry is the source and basic industry of the entire silicon industry chain. The polysilicon and photovoltaic industry is the fastest growing and most promising industry in recent years. The industrial silicon industry and the polysilicon and photovoltaic industry belong to the upstream and downstream product industries of the silicon industry chain, and there are tight constraints between quantity and quality. my country is a major producer of industrial silicon. In 2016, my country's industrial silicon output was 2.252 million tons, a year-on-year increase of 4.74%. [0003] The rapid development of the photovoltaic industry, the increasing demand for polycrystalline silicon solar cells, and the rapid development of aluminum-silicon alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
CPCC01B33/037C01P2006/80
Inventor 魏奎先王杰马文会李绍元谢克强伍继君于洁雷云吕国强
Owner KUNMING UNIV OF SCI & TECH
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