Why Is The Price Of Brown Corundum Much Higher Than Black Corundum?

First of all, introduce what is black corundum, black corundum, also known as low aluminum corundum, is in the arc furnace, the bauxite smelting and produced a kind of α-Al2O3 and iron ore phase of gray black crystals.

It is characterized by a low Al2O3 content and a certain amount of Fe2O3(about 10%), so it has the characteristics of moderate hard bottom, high toughness, high temperature resistance, and hot state performance.

Black corundum is mostly used for free grinding, such as rough grinding of products before electroplating, mainly used for polishing and sandblasting of stainless steel, metal products, optical glass, bamboo and wood products, and a novel abrasive for manufacturing resin grinding wheels, cutting sheets, and gauze.

From the introduction of "low aluminum", "Fe2O3(about 10%) can see why the price of black corundum is low." Because aluminum is definitely more expensive than iron, black corundum is much more iron. The highest content of first grade black corundum aluminum is 85%, the second grade is only 75%, the third grade 65%, the aluminum content is exactly corresponding to the brown corundum second grade, second grade, third grade sand, and the price is also corresponding in turn.