Micro-negative pressure external refining method for industrial silicon melts

A technology of refining outside the furnace and a micro-negative pressure furnace, which is applied in the fields of chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of increasing energy input consumption and discharge of industrial wastes, etc., and achieves the effect of easy operation and simple equipment

Active Publication Date: 2020-09-11
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional gas blowing refining, slagging refining and oxidizing refining in the prior art mainly use the principle of high affinity between aluminum and calcium impurities in silicon melt and oxygen and the large distribution ratio in slag to remove impurities, because a large amount of aluminum and calcium impurities are consumed in the refining process The industrial oxygen, air and slag agent not only increase the energy input consumption and the discharge of three industrial wastes, but also put forward new requirements for the service life, corrosion resistance, etc. of the equipment in the actual production process, as well as the level of equipment control and operation.

Method used

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  • Micro-negative pressure external refining method for industrial silicon melts
  • Micro-negative pressure external refining method for industrial silicon melts

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Embodiment 1

[0029] Embodiment 1: a kind of method for micro-negative pressure refining of industrial silicon melt outside the furnace, the specific steps are as follows:

[0030] (1) In the production of an industrial silicon smelting enterprise in Yunnan, about 2 tons of silicon melt released from the submerged arc submerged arc electric furnace are packed in the refining ladle outside the furnace. In order to further reduce Al and Ca, the silicon melt in the ladle is The silicon melt is oxidized and gas blown again; in terms of mass percentage, the impurity content in the silicon melt is 8000ppm for Al and 15000ppm for Ca;

[0031] (2) The silicon melt of step (1) is carried out oxidation blowing refining, wherein the blowing mode of oxidation blowing refining is top blowing ventilation, and gas is industrial oxygen, and top blowing ventilation time is 0.5h, and top blowing ventilation pressure is 1.2 to 2 atmospheres, gas velocity 0.2 to 1m 3 / s;

[0032](3) While step (2) is oxidizi...

Embodiment 2

[0035] Embodiment 2: a kind of method for micro-negative pressure refining of industrial silicon melt outside the furnace, the specific steps are as follows:

[0036] (1) In the production of an industrial silicon smelting enterprise in Yunnan, about 2 tons of silicon melt released from the submerged arc ore electric furnace were put into the refining ladle outside the furnace. In order to further reduce Al and Ca, the silicon melt in the ladle was The silicon melt is subjected to slagging and refining; in terms of mass percentage, the impurity content in the silicon melt is 6000ppm for Al and 1300ppm for Ca;

[0037] (2) Add slag-forming agent CaO in step (1) silicon melt, then feed industrial compressed nitrogen to carry out slagging refining, in terms of silicon melt, wherein the add-on of slag-forming agent CaO is 2kg / ton, industrial The ventilation time with compressed nitrogen is 15 minutes;

[0038] (3) At the same time of step (2) slagging and refining, micro-negative...

Embodiment 3

[0041] Embodiment 3: a kind of method for micro-negative pressure refining of industrial silicon melt outside the furnace, the specific steps are as follows:

[0042] (1) In the production of an industrial silicon smelting enterprise in Yunnan, about 2 tons of silicon melt released from the submerged arc ore electric furnace were put into the refining ladle outside the furnace. In order to further reduce Al and Ca, the silicon melt in the ladle was The silicon melt is subjected to blowing-slagging compound refining; in terms of mass percentage, the impurity content in the silicon melt is 5000ppm for Al and 1100ppm for Ca;

[0043] (2) Add slag-forming agent CaO to the silicon melt in step (1), and then feed industrial oxygen to carry out air blowing-slagging compound refining, in terms of silicon melt, wherein the amount of slag-forming agent CaO added is 1kg / ton , when gas blowing-slagging compound refining, the way of introducing industrial oxygen is top blowing ventilation,...

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Abstract

The invention relates to a micro-negative pressure external refining method for industrial silicon melts, and belongs to the technical field of pyro-refining purification of silicon melts. A micro-negative pressure device is moved to the position over a ladle opening of an external refining device, a vacuum device of the micro-negative pressure device is started to enable the industrial silicon melts to be subjected to micro-negative pressure external refining, volatile impurities in the industrial silicon melts are removed in the external refining process of the industrial silicon melts, andthe quality of silicon products is improved. According to the invention, a micro-negative pressure environment is created above the silicon melts, so that the escape of flue gas in the external refining process of the silicon melts can be avoided, and the environmental influence is reduced. The method is simple in equipment requirement, easy to operate, environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for refining industrial silicon melt outside a micro-negative pressure furnace, belonging to the technical field of industrial silicon smelting. Background technique [0002] In the process of producing industrial silicon in a submerged arc furnace, in order to further reduce the impurity content in the silicon melt, it is often necessary to refine the silicon melt outside the furnace to prepare high-quality industrial silicon. In the refining process outside the furnace, the refining methods adopted for different impurities mainly include gas blowing refining, slagging refining and oxidation refining. [0003] Conventional gas blowing refining, slagging refining and oxidizing refining in the prior art mainly use the principle of high affinity between aluminum and calcium impurities in silicon melt and oxygen and the large distribution ratio in slag to remove impurities, because a large amount of aluminum and calcium i...

Claims

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Application Information

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IPC IPC(8): C01B33/037
CPCC01B33/037
Inventor 魏奎先邓小聪马文会伍继君
Owner KUNMING UNIV OF SCI & TECH
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