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External refining method of industrial silicon

A silicon furnace and industrial technology, which is applied in the field of refining outside the industrial silicon furnace to achieve the effect of low cost and simple operation

Inactive Publication Date: 2011-11-16
云南永昌硅业股份有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method for refining industrial silicon outside the furnace, which can reduce the aluminum content in the process of refining industrial silicon outside the furnace, improve the quality of industrial silicon products, and solve the market demand for low aluminum Problems with industrial silicon products and differentiated products of special grades of industrial silicon

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  • External refining method of industrial silicon

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Embodiment Construction

[0010] The submerged arc furnace releases the molten silicon liquid with a silicon content greater than 98% and discharges it into the silicon bag blowing oxygen at the bottom. Before the silicon water flows into the silicon bag, turn on the compressed air at 350L / min and ensure that the air pipe is unblocked. When the silicon liquid flows into the silicon bag After bagging, feed oxygen and control the oxygen flow rate to 700L / min. When the amount of silicon liquid reaches 2000Kg, use a digital display thermometer to measure the temperature of the silicon liquid. Add calcium stone 33-50Kg. During operation, make sure that the added calcium stone is in a molten state, otherwise adding calcium stone will be invalid. When the silicon liquid in the silicon bag reaches 5000kg, measure the temperature of the silicon liquid again, and use the method of increasing cold silicon to reduce the temperature. Silicon liquid temperature or adjust the air + oxidation ratio to strengthen the ox...

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Abstract

The invention discloses an external refining method of industrial silicon. According to the method, compressed air and oxygen are introduced, so that oxidation of aluminum in silicon liquid is accelerated to form oxidized slag in the presence of refining impurity remover calspar; impurity remover calspar has decomposition reaction in the high-temperature silicon liquid to generate calcium oxide; calcium oxide reacts with aluminum in silicon water so as to oxidize and remove aluminum (Al); and the generated aluminum-containing slag easily floats up to achieve the aim of separating and removing slag from liquid. By the adoption of the method disclosed by the invention, the aluminum content can be reduced, the quality of an industrial silicon product can be enhanced and the markedemands on low-aluminum industrial silicon products and different models of special industrial silicon differential products can be met.

Description

technical field [0001] The invention relates to a method for refining industrial silicon outside a furnace. Background technique [0002] The external refining of industrial silicon adopts the oxidation refining method, that is, the mixed gas of oxygen and air is introduced for refining. The refining process is essentially a slagging process, which is a slag-based balanced refining process. This method is based on the reaction of impurities being oxidized. It is a kind of selective oxidation to achieve the removal of impurities through the process, and it is refined only by the ternary alloy of silicon, aluminum and calcium in the product. Since the affinity between calcium and oxygen is the largest and it is easier to be removed, it cannot reach the balance of refining In addition, the temperature of the silicon liquid is high, with an average of 1650°C. Under high temperature conditions, the affinity between aluminum and oxygen is poor, which is not conducive to the oxidat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 张安福李昆王炳金匡美淑王子龙卢国洪余建辉
Owner 云南永昌硅业股份有限公司
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