Premixed Hydrogen-oxygen Flame Burning The Preparation Of Nano-silica Technology Research

Gas phases combustion synthesis of nano-silica particles with a very small size,The huge surface area,High purity and linked into a network and the tendency, It is reinforced, thickening, thixotropic,emulsion, extinction, such as the role of anti-skid, In addition to the reinforcement of the rubber, has also been widely used in plastics, paint, coatings, adhesives, inks, cosmetics, toothpaste, lubricants and other industrial areas, It is a very important chemical raw materials, With micro-electronics, special catalyst, high-grade automotive paints, fine ceramics, such as the rapid development of high-tech products, Nano-particles of silica growing market.In this paper, gas-phase preparation and nano-silica reaction, application of nano-silica, combustion synthesis gas particles in a nuclear and growth were reviewed, And the growth of nuclear particles into the basis of in-depth study of the theory, Pre-mixed-use high-temperature hydrogen-oxygen flame hydrolysis of the nano-silica powder, Through TEM, SEM BET, and other means of testing, research results show that:(1) Pre-mixed multi-ring jet hydroxide flame burning reactor compared to the traditional support combustion can provide a more uniform temperature, concentration and the residence time distribution, Preparation is conducive to high-quality nano-silica particles.(2) Pre-mixed multi-ring jet hydroxide flame burning reactor can surface area of 100-500 m2/g of nano-silica particles. Nano-silica particles in the DBP oil absorption value of the primary particle morphology, particle size distribution, and other technical indicators are significantly closer to the level of foreign high-quality products. Chain and its network structure significantly, and each chain from a dozen to a few dozen particles; A reunion of the particle size distribution in the 40-400 nm, the second reunion of particle size distribution in the 10-100μm.(3) In pre-mixed multi-ring jet hydroxide flame burning reactor of nano-particles of silica, Particle size by the impact of the various operating parameters. With the increase of temperature, particle size increased. With silicon tetrachloride Moore at the rate of increase in particle size decreases.(4) Nano-particles of silica in the process of particles in different locations of the different models. In the vicinity of the nozzle, Particles Grow with Ballistic Aggregation. In the reactor, inside and flocculation. Particles Grow with Diffusion—Limited Aggregation.