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The recycling of fine silicon powder and the encryption process

wallpapers Tech 2021-01-15
The production of fine silicon powder, the recycling of fine silicon powder and the encryption process. The dust-containing flue gas generated during electric furnace smelting is led to the air cooler by the low hood through the air duct and the flue gas from the tap hole. The cooler cools the flue gas temperature and enters the cyclone dust collector to remove the large dust and carbon particles in the flue gas, and then enters the bag filter to filter. The filtered flue gas is discharged from the chimney or the exhaust chamber at the top of the dust collector.
 
Most of the domestic dust collectors for recycling silicon powder are bag filters, both positive pressure and negative pressure; there are back-blowing internal filtration and pulse injection external filtration; both use coated glass fiber filter materials. There are also flumes, glass fibers, 729 filter materials and so on.
 
The densification of silicon powder is a condensation process that takes place in a silo and uses air from a blower as an energy source. The bulk density of silica powder can be controlled within 0.2~0.6t/m3. There are many factors that affect the entire encryption process, such as the moisture, fluidity, original bulk density, and operation of the silicon powder.
 
Silicon powder recovery and the encryption process
 
At present, the production of silicon powder is divided into 5 systems: C-1 system, C-2 system, C-3 system, Q-1 system, Q-2 system.
 
The C-1 system processes the flue gas from the 4×12.5MVA ferrosilicon electric furnace of the second smelter. It is divided into two sub-systems and is led from the emission chimney, and sent to the C-1 baghouse dust collector through the air cooler, spark arrestor and induced draft fan for purification. After the flue gas is discharged from the top of the dust collector.
 
The C-2 system processes the flue gas from the 2×25MVA ferrosilicon electric furnace of the third smelter. It is divided into two sub-systems and is led out from the emission chimney. The two sub-systems enter the C-2 baghouse dust collector through the air cooler and the spark trap. The induced draft fan is exhausted and discharged from the chimney.
 
The C-3 system processes the flue gas from a 7×5MVA electric furnace in a smelter. It is divided into two sub-systems and is led out from the emission chimney, and sent to the C-3 baghouse dust collector through the air cooler, spark trap, and induced draft fan. The purified smoke The air is discharged from the top of the dust collector.
 
The silicon micro powder collected by the Q-1 system and the C-1 system and the C-2 system enters encrypted and mechanized packaging.
 
The Q-2 system encrypts and mechanizes the silicon powder collected by the C-3 system.
 
C-1 and C-2 system bag house dust collectors are equipped with Gore-TEX membrane filter bags, and C-3 system baghouse dust collectors are equipped with domestic 729 filter bags.

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