400-0001-2463
|
sales@china-materials.com

News

07 2021/07

Graphite mining, beneficiation, and milling

Graphite is mined by both open pit and underground methods. Graphite usually needs beneficiation. This may be carried out by hand-picking the pieces of gangue (rock) and hand-screening the product or by crushing the rock and floating out the graphite. Beneficiation by flotation encounters the difficulty that graphite is very soft and "marks" (coats) the particles of gangue. This makes the "marked" gangue particles float off with the graphite, yielding impure concentrate. There are two ways of obtaining a commercial concentrate or product: repeated regrinding and floating (up to seven times) to purify the concentrate, or by acid leaching (dissolving) the gangue with hydrofluoric acid (for a silicate gangue) or hydrochloric acid (for a carbonate gangue).

07 2021/07

History of natural graphite use

History of natural graphite use

07 2021/07

Graphite

Graphite (/ˈɡræfaɪt/) is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on large scale (300 kton/y ea, in 1989) for uses in pencils, lubricants, and electrodes. Under high pressures and temperatures it converts to diamond. It is a weak conductor of heat and electricity.

07 2021/07

Why Chromite Sand

Chromite sand has been selected and used in foundries as a result of its unique combination of properties. The properties listed below generally result in a better surface finish and reduced likelihood of casting defects. Scroll down to learn more on each property

07 2021/07

About Chromite

Chromite is the main source of the metal chromium, a metal used to induce hardness, toughness and chemical resistance in steel. It was named after its chemical composition, chromium oxide. The mineral is brownish to black in colour with a dark brown streak. It has a conchoidal or an uneven fracture as well as no distinct cleavage. Crystals are small and rare. It may occur in octahedrons but it is most commonly found as a massive structure. Finally, although not all samples of chromite are magnetic some specimens may show slight magnetism.

Clear It All
Total0
去付款
share share