Afterheat recovery method and special appts for silcon ore furnace fume purification and nano si02 micro powder

A special equipment and flue gas purification technology, applied in chemical instruments and methods, lighting and heating equipment, separation methods, etc., can solve the problems of large equipment structure, increased dust removal fan power and operating costs, difficulty in improving the grade of silicon products, etc. , to achieve a good effect

Inactive Publication Date: 2007-11-28
金科
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  • Description
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  • Application Information

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Problems solved by technology

However, the silicon content of silicon products will decrease, making it difficult to improve the grade of silicon products
At the same time, the power and operating costs of the dust removal fan are also increased, and the waste heat of the flue gas has not been recycled.
The air cooler is used, which occupies a large area and has a huge equipment structure, which wastes the waste heat resources of the flue gas, and the investment cost is equivalent to that of the waste heat boiler.
Therefore, the traditional dust removal technology is difficult to fully meet the dust control requirements of silicon submerged arc furnaces. It is necessary to modify the traditional dust removal equipment to develop flue gas purification and nano-SiO 2 Micropowder Recovery and Waste Heat Recovery Method and Its Special Equipment

Method used

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  • Afterheat recovery method and special appts for silcon ore furnace fume purification and nano si02 micro powder
  • Afterheat recovery method and special appts for silcon ore furnace fume purification and nano si02 micro powder

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0022] In Fig. 1, the dust generation mechanism of silicon submerged arc furnace 1: the production of industrial silicon, ferrosilicon, silicon manganese, silicon calcium is in the high temperature reducing atmosphere of submerged arc furnace, high-purity SiO 2 It is prepared by reacting CaO with coke. In SiO 2 During the reduction reaction with CaO, a large amount of SiO and CO gas escape from the material surface, and gaseous SiO and O in the air 2 The reaction produces free SiO 2 Micronized powder, namely:

[0023] SiO 2 +C=SiO+CO

[0024] CaO+3C=CaC 2 +CO

[0025] 5SiO 2 +2CaC 2 =3Si+2CaSiO 3 +4CO

[0026] SiO+1 / 2O 2 = SiO 2

[0027] The inventor shows through sampling test that industrial silicon submerged arc furn...

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Abstract

Dedicated equipment integrating multiple decentralized coarse and fine fume cleaning equipment and heat recovery boiler is composed of fume intake duct, upper cone shaped clearance chamber, straight shaped reclaiming chamber, lower cone shaped ash collection chamber and clearance delivery tube for cleansing fume from hot stove of silicon mine, reclaiming nano SiO2 powder and waste heat. Upper part of the straight shaped reclaiming chamber includes several filters made from metal rubber or mipor ceramics, and lower part is composed of several tubular type heat exchangers with forced circulation water-cooled guide plate. Fume cleaning reaches discharge standard. Reclaimed saturated steam can be utilized for production and life and grain size of reclaimed nano SiO2 powder less than 100nm is more than 60%.

Description

technical field [0001] Flue gas purification of silicon submerged arc furnace described in the present invention, nano-SiO 2 The method of micropowder recovery and waste heat recovery and its special equipment belong to the fume control, waste heat recovery and nano SiO of submerged arc furnaces for the production of industrial silicon, ferrosilicon, silicomanganese and silicon calcium 2 Technical field of preparation. technical background [0002] Existing nano-SiO 2 The preparation techniques mainly include the following methods: [0003] (1) Gas phase synthesis method [0004] Under the protection of hydrogen atmosphere, SiCl 4 SiO is produced during combustion 2 Micropowder: [0005] SiCl 4 +2H 2 +O 2 = SiO 2 +4HCl [0006] This method is complex in technology, high in production cost, and high in price, so it is difficult to popularize and apply. [0007] (2) Sol-Gel method [0008] Silicone ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00B01D50/00C01B33/113
CPCY02P10/25Y02P20/10Y02P20/129
Inventor 金科
Owner 金科
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