What is physical vacuum smelting?

Physical method solar cell polysilicon

What is physical vacuum smelting?

admin on January 13, 2022 0 Comments • Tags: #impuritiesinsilicon #inductionheating #principleofelectromagneticinduction

This method is carried out under vacuum conditions, and the effect of impurity removal is achieved through several processes of degassing, decomposition, volatilization and deoxidation. At a temperature slightly higher than the melting point of silicon (1500°C), the Mo gas pressure of silicon is 0.5Pa, and at this time, impurities with a Mo gas pressure … Read More

What is the hydrometallurgical technology to remove impurities from metal silicon?

Physical method solar cell polysilicon

What is the hydrometallurgical technology to remove impurities from metal silicon?

admin on January 7, 2022 0 Comments • Tags: #advantagesofhydrometallurgy #enhancedleachingmethod #impuritiesinsilicon

Hydrometallurgy refers to the method of crushing metallurgical silicon and immersing it in an acid solution (or other substance solution) to remove metal impurities in the metal silicon. Hydrometallurgy needs to crush industrial silicon into powder with a suitable particle diameter, otherwise it will not be easy In addition to miscellaneous. Prepare a certain concentration … Read More

What is the slagging and standing clarification method?

Physical method solar cell polysilicon

What is the slagging and standing clarification method?

admin on December 31, 2021 0 Comments • Tags: #dephosphorizingagent #precipitationfluxdeslaggingrefiningmethod #slaggingagent

The slag-making static clarification method is to add a slag-making agent to keep the melt for a period of time under the condition of maintaining the refining temperature and flux coverage to make the inclusions float or sink and remove. The low melting point flux added to the metal melt combines with non-metallic inclusions at … Read More

What physical methods are there to remove impurities from silicon water?

Physical method solar cell polysilicon

What physical methods are there to remove impurities from silicon water?

admin on December 28, 2021 0 Comments • Tags: #airblowingmethodtoremoveimpurities #electronbeamvacuummeltingmethod #impuritiesinsilicon

1. Air Blow methodBlow inert gas, high-purity oxygen, hydrogen, nitrogen, argon and water vapor into the silicon water. These gases rise from the silicon water. Each small bubble is equivalent to a “small vacuum chamber”. The partial pressure of H, N, and CO in the bubble is close to zero. Adsorbed to the bubble surface … Read More

How to prepare solar cell polysilicon by physical method?

Physical method solar cell polysilicon

How to prepare solar cell polysilicon by physical method?

admin on December 22, 2021 0 Comments • Tags: #impuritiesinsilicon #purifiedsolargradesilicon #sourcesofimpuritiesinsiliconmaterials

The physical method is that the silicon element in the metal silicon does not participate in the chemical reaction, but uses different physical methods to remove different impurities step by step to achieve the purpose of purification. Because this method is similar to the method of refining outside the metallurgical furnace in many aspects, it … Read More

How to prepare polysilicon by the silane method?

Solar cell silicon material

How to prepare polysilicon by the silane method?

admin on December 17, 2021 0 Comments • Tags: #chemicalpreparationofpolysilicon #disadvantagesofsilanemethod #preparationmethodofpolysilicon

Silane is actually an abbreviation for monosilane. Silane is easy to thermally decompose, and high-purity polysilicon can be obtained by decomposing at 800~900℃, and the reduction energy consumption is low. In addition, monosilane is easy to purify and is a gas at room temperature, so it can be effectively removed by adsorption purification methods. The … Read More

How to prepare polysilicon by zinc reduction method?

Solar cell silicon material

How to prepare polysilicon by zinc reduction method?

admin on December 14, 2021 0 Comments • Tags: #problemsofzincreductionmethod #processflowofzincreductionmethod #technologyofpreparingpolysiliconbyzincreductionmethod

The technology for preparing polysilicon by the zinc reduction method is not the latest technology. In terms of history, it was born before the Siemens method. The zinc reduction method was first tested by DuPont in the United States during World War II, using zinc (Zn) to reduce SiCl4 to produce polysilicon. During the 1950s … Read More

Improved Siemens method preparation process and precautions

Solar cell silicon material

Improved Siemens method preparation process and precautions

admin on December 9, 2021 0 Comments • Tags: #improvedsiemenspreparationprocess #pointstonotefortheimprovedsiemensmethod #polysiliconpreparationprocess

1. Hydrogen preparationHydrogen is produced by electrolysis of desalinated water in the electrolytic cell, and the hydrogen is cooled, separated from the liquid, and then enters the deaerator. Under the action of the catalyst, the trace amount of oxygen in the hydrogen reacts with hydrogen to form water and is removed; the deoxygenated hydrogen is … Read More

Improved Siemens method to manufacture solar cell polysilicon

Solar cell silicon material

Improved Siemens method to manufacture solar cell polysilicon

admin on December 7, 2021 0 Comments • Tags: #advantagesoftheimprovedsiemensmethod #improvedsiemensprocessequipmentused #siemensprocess

In 1955, Siemens successfully developed the process technology of using H to reduce SiHCl3 to deposit silicon on a silicon core heating element, and built a factory in 1957 for industrial-scale production, which is commonly referred to as the Siemens method. Based on the Siemens process, it was further improved later, adding a reduction tail … Read More

What is the percentage of purity of metal silicon?

Solar cell silicon material

What is the percentage of purity of metal silicon?

admin on November 29, 2021 0 Comments • Tags: #impuritiesofmetalsilicon #metallurgicalgradesilicon #physicalmethodpolysilicon

The purity of the reduced silicon is mostly 98% to 99.9%, which is called metallurgical grade silicon (MG-Si). Metallurgical grade silicon, also known as industrial silicon, chemical silicon, crystalline silicon or metallic silicon, is mainly used as an additive for non-ferrous alloys, as an alloying agent for silicon steel, and as a deoxidizer for smelting … Read More