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【Fumed Silica Technology】


Technology Overview:
Fumed silica is an important nano inorganic chemical material with a small particle size( 7 to 40 nm ), large specific surface area (50 to 400 m2/g) and high purity (SiO2≧99.9%). The product has a superior surface chemical properties as well as high compressive strength. It has a wide range of applications in silicone rubber, adhesives, cements, paints, coatings, inks, electronics, paper, cosmetics, pharmaceuticals, food and agriculture with main function of reinforcing, thickening, thixotropic and extinction. It is the essential raw material for hightech sectors and the defense industry. Fumed silica is also known as industrial MSG.
JGNMT‘s fumed silica technology, led by foreign experts, is developed through continuous innovation, optimization, and commercial practice. Compared to the current widely used domestical technology, our technology has unparalledled advantages in terms of high capacity, long uptime, high degree of automation, long lifetime of equipment and good product quality.


Brief Introduction of Process:
Mixed air, hydrogen and vaporised chlorosilane (STC, MCS, TCS) enter fumed silica Hydrolysis Reactor to produce nano particles of silicon dioxide in the flame that has a temperature less than 2000℃. The nano silicon dioxide then is formed into micron size silicon dioxide powder by the cooling and agglomeration, then the micron size silicon dioxide enters Cyclone Separator before the separated powder enters deacidification and drying system to get fumed silica product. The fumed silica product is then sent to Packing Workshop to be packed. The gas containing Hydrogen Chloride exited from the Cyclone Separator is sent to hydrochloric acid absorption unit to absorb acid gas. After dust removal and absorption system, we get the high concentrated hydrochloric acid and the remaining off-gas is vented after hazard treatment.
 


Reaction Formula:
SiCl4+3H2+1.5O2→SiO2+4HCl+H2O
SiHCl3+2H2+1.5O2→SiO2+3HCl+H2O
CH3SiCl3+H2+2O2→SiO2+3HCl+H2O+CO2
 


Advantages and Features:
Advantages:
 
--High throughput per train: 5000 metric tons/year.
--Closed manufacturing process: ensures precise control of the ratio of raw materials, stable specific surface area and high purity.
--Reactants can be STC, MCS, TCS or a combination of any two or three, and thus reducing product cost by increasing the sources of raw material.
--Automatic control for safe operation.
--Lower operation costs. System uptime is 8000 hours with only one annual scheduled maintenance shutdown.
--Complete product grades meet the needs of customers from different industries and high quality products can compete with imported products.
--Environmental Friendliness: All waste is treated for a clean and safe working environment.
 
Features:
 
--Raw material treatment for to ensure the its purity.
--Closed reactor with on-line monitoring of reaction condition.
--Optimized agglomeration, deacidification and drying process and equipment ensure product quality and equipment operating condition.
--Optimized dust removal and HCL process and equipment ensure the high concentration of hydrochloric acid, low dust content and stabilization of downstream vacuum system.
--Optimized waste treatment ensures non-hazardous treatment for CL2, HCL, SIO2 and Chlorosilane.