Know how the colloidal graphite powder comes in
Colloidal graphite is a kind of nano material of graphite. The particle size between 1 and 100 nm is called colloidal graphite.Colloidal graphite prices are mainly based on the grain size and carbon content to develop, according to the amount of carbon graphite into high purity, high and medium carbon and low carbon four files, each grade of the difference between the price of a large, but since processed into colloidal graphite, then the carbon content of high carbon should at least be above, if there is no way know the amount of carbon it can only roughly estimate the price of 4-6 million / ton, if it is pure graphite (carbon 99.9%-99.99% above) the price is at least 100 thousand / ton
There are two ways to make colloidal graphite: (1) mechanical method. Natural graphite is crushed and treated with hydrochloric acid and hydrofluoric acid to remove impurities. Added to the aqueous solution of tannic acid, which is repeatedly inverted into paste. Colloidal graphite can be obtained by adding a certain proportion of water and ammonia, and then by ultrasonic treatment to further reduce the particle size. (2) chemical method. After being purified and crushed, the natural graphite is added with concentrated nitric acid and concentrated sulfuric acid and water at 90 DEG C, and then obtained by cleaning, drying, adding water, ethanol, acetone and other dispersing agents to obtain colloidal graphite. Add stabilizer such as sodium oleate, sulfate and so on, so that graphite particles do not agglomerate. Ammonia transfers the graphite colloid to the gum solution and regulates the pH value.
Smaller graphite particles are uniformly dispersed in water, oil, and other organic solvents, forming a black, sticky suspension. Also called colloidal graphite or graphite milk.Colloidal graphite was first obtained in nineteenth Century by Acheson. The raw material is natural graphite or artificial graphite.
