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Zinc electrolyzing and recycling device and processing method

A technology of recycling, processing and recycling device, applied in the field of solar polysilicon ingot preparation, can solve the problems of non-reusable by-product slag phase, waste of environment, large amount of slag, etc., achieve considerable market prospects, short investment cycle, reduce production cost effect

Inactive Publication Date: 2012-03-28
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent US 6,368,403 B1 (Frederick Schmid, Chandra P.Khattak, David B.Joyce.Method and apparatus for purifying silicon, Patent Number US6368403B1, Apr.9, 2002) adopts techniques such as blowing slagging to carry out purification, and it is mainly to The removal of B, C and O, and the removal effect is very good, but due to the large amount of slag required by this process, the cost is increased and the by-product slag phase cannot be reused, causing great waste and environmental pollution

Method used

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  • Zinc electrolyzing and recycling device and processing method
  • Zinc electrolyzing and recycling device and processing method
  • Zinc electrolyzing and recycling device and processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put 200Kg of industrial silicon and 5Kg of zinc into the quartz crucible, turn on the heating power supply, energize the induction heating coil, the power is 200kW, the graphite heating sleeve will generate heat by induction, and heat the silicon and zinc in the quartz crucible , silicon and zinc begin to melt slowly as the temperature rises. When the silicon in the quartz crucible is completely melted to form a silicon-zinc alloy melt, a thermocouple temperature measuring device is used to measure the temperature of each point in the vertical direction inside the quartz crucible, and the induction heating power controller is adjusted. Start the directional solidification lifting device, and drive the quartz crucible containing the alloy melt and the graphite chassis to pull down together to produce directional solidification, and the falling speed is 10mm / h. When the alloy melt in the quartz crucible is completely solidified, cut off the current of the induction heatin...

Embodiment 2

[0044] Technological process is with embodiment 1. Put 240kg of industrial silicon and 10kg of zinc into a quartz crucible, turn on the heating power supply, and energize the induction heating coil with a power of 180kW. After all the silicon and zinc in the crucible are melted, adjust the induction heating power controller to start the directional solidification lifting device, the descending speed is 15mm / h. After the orientation process is completed, the alloy silicon ingot is taken out, and the upper 25% is cut off. The remaining part is determined to be a polycrystalline silicon ingot with a purity of 99.999611%, and the crystal grains of the silicon ingot are larger than 1.1 mm and are vertically oriented columnar crystals, and the resistivity is 0.49-1Ω·cm. figure 2 In the electrolyzer shown, the zinc is recovered by the electrolytic process, while the remaining silicon is recovered by pickling. The recovered silicon was placed in a crucible, mixed with 300 g of germ...

Embodiment 3

[0046] Technological process is with embodiment 1. Put 220kg of industrial silicon and 5kg of zinc into a quartz crucible, turn on the heating power supply, and electrify the induction heating coil with a power of 160kW. After all the silicon and zinc in the crucible are melted, adjust the induction heating power controller. Start the directional solidification lifting device, and the descending speed is 5mm / h. After the orientation process is completed, the alloy silicon ingot is taken out, and the upper 15% is cut off. The remaining part is determined to be a polycrystalline silicon ingot with a purity of 99.999396%, and the crystal grains of the silicon ingot are larger than 5mm and are vertically oriented columnar crystals, and the resistivity is 4.4·cm~5Ω·cm. figure 2 In the electrolyzer shown, the zinc is recovered by the electrolytic process, while the remaining silicon is recovered by pickling. The recovered silicon is placed in a crucible, mixed with 250 g of germa...

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Abstract

The invention discloses a zinc electrolyzing and recycling device and a processing method and relates to solar polysilicon. The zinc electrolyzing and recycling device is provided with an electrolytic bath, a rectifier, a low-order liquid collecting tank, a heating tank, an anti-acid pump and a high-order tank. The anode and the cathode of the electrolytic bath are connected with the output end of the rectifier, the electrolytic bath is connected with the low-order liquid collecting tank and the heating tank respectively, and the low-order liquid collecting tank is connected with the high-order tank which is connected with the heating tank. After being electrolyzed and heated, the silicon is arranged in a crucible and mixed with germanium to be arranged in a furnace; a furnace room is vacuumized and connected with a heating power supply, so that the silicon in the crucible is heated gradually until all the silicon is melted; and by the directional solidification, the silicon is solidified gradually from the bottom to the top so as to form the directional solidification polysilicon.

Description

technical field [0001] The invention relates to a solar polysilicon, in particular to a method and a device for preparing a solar polysilicon ingot. Background technique [0002] With the development of my country's economy, energy and environmental issues are becoming more and more important, which are directly related to the long-term sustainable development of our country in the future. my country is a big energy-consuming country dominated by coal and oil, but our country's per capita resources are relatively poor. On the other hand, when raw materials such as coal and petroleum are used as energy sources, serious pollution will be caused to the environment. Therefore, the development and utilization of renewable clean energy has become a very important way. Among them, solar energy is the most important clean renewable energy. Developed countries in the world attach great importance to the development and utilization of solar energy. For example, the United States ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/06C30B29/06C25C1/16C25C7/00C01B33/037
CPCY02P10/20
Inventor 罗学涛沈晓杰李锦堂郑淞生
Owner XIAMEN UNIV
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