Method for preparing metallic silicon material

A technology of metal silicon and equipment, applied in the field of metal silicon material engineering, can solve the problems of high cost of producing polysilicon raw materials, restricting the popular use of solar cells, and high energy consumption.

Inactive Publication Date: 2008-05-21
晶湛(南昌)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the existing metal silicon raw material preparation technology, high energy consumption, high input and low output are the main reasons for the high cost of polysilicon raw materials, which seriously restricts the popularization and use of solar cells

Method used

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  • Method for preparing metallic silicon material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Install airtight pipe joints for oxygenation and pipe joints for exhaust gas on the bell jar of conventional electric arc furnaces, install inlet valves and oxygenation pipes on the pipe joints for oxygenation, and install airtight pipe joints for exhaust gas Exhaust valve and exhaust pipe are installed on the pipe joint, can obtain the smelting furnace of the present invention, its structure is specifically seen accompanying drawing 1.

Embodiment 2

[0064] The quartz ore silica with a purity of 99.5% is selected for pickling first. Specifically: the proportioning component is 3HCl: HNO 3 aqua regia to wash away heavy metals, metal ions and / or metal compounds, etc. Then, the phosphorous and boron compounds were washed away with an HF solution [50 parts of pure water: 1 part of HF (49%)]. After testing, the cleaned silicon dioxide (SiO 2 ), from 99.5% to 99.9%. Then use the freeze vacuum drying method to dry to make the water content <1%.

[0065] The quartz ore silica through the above operations is charged into the melting furnace of the present invention. Oxygen injection starts when the melting furnace reaches 600°C, and the oxygen injected is 98% O 2 , the furnace temperature is gradually raised to 1300°C at 10°C per minute to completely oxidize the phosphorus and boron in the silica ore to form phosphorus and boron oxide-P 2 o 5 / B 2 o 3 .

[0066] After the phosphorus boron is completely oxidized, stop the ...

Embodiment 3

[0070] Choose quartz ore silica with a purity of more than 99%, crush the quartz sand to the micron level, and then pickle it. Specifically: the proportioning component is 3HCl: HNO 3 aqua regia to wash away heavy metals, metal ions and / or metal compounds, etc. Then, the phosphorous and boron compounds were washed away with an HF solution [50 parts of pure water: 1 part of HF (49%)]. After testing, the cleaned silicon dioxide (SiO 2 ), from 99.% to 99.9%. Then use the centrifuge dehydration drying method to dry to make the water content <1%.

[0071] The quartz ore silica through the above operations is charged into the melting furnace of the present invention. Oxygen injection starts when the melting furnace reaches 600°C, and the oxygen injected is 98% O 2 , the furnace temperature gradually rises to 1300°C to completely oxidize the phosphorus and boron in the silica ore to form phosphorus and boron oxide-P 2 o 5 / B 2 o 3 .

[0072] After the phosphorus boron is co...

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Abstract

The invention discloses a preparation method of a metallic silicon raw material and equipment used in the preparation method. The invention uses a method that quartz mineral sand silicon dioxide is firstly purified and then reverted into the metallic silicon by injecting oxygen instead of avoiding oxygen, and improves traditional melting furnaces processing equipment such as electric arc furnaces and argon arc furnaces, can reach large-scale production as well as greatly promote the pureness of the metallic silicon; the invention has few processing steps and convenient operation and provides highly productive and low energy-consuming raw materials for solar polysilicon / monocrystalline silicon.

Description

technical field [0001] The invention belongs to the field of metal silicon material engineering. The invention relates to a method for preparing a metal silicon material, in particular, the invention relates to a method for firstly purifying the silicon dioxide of quartz ore and then reducing it to prepare the metal silicon material. The present invention also relates to a device used in the preparation method of the metal silicon material. Background technique [0002] Metal silicon is the main raw material for the purification of polysilicon in solar cells, and the purification accuracy of metal silicon directly affects the purification efficiency, cost and effect of solar polysilicon. The mainstream technology for the preparation of metal silicon raw materials in the world is to use electric arc furnace / argon arc furnace / various radio frequency furnaces for high temperature reduction, quartz (SiO 2 ) and carbon in the reduction furnace to generate industrial (metal)...

Claims

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Application Information

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IPC IPC(8): C01B33/023
Inventor 罗应明
Owner 晶湛(南昌)科技有限公司
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