Bentonite, sodian CAS#85049-30-5

Carbon black, also known as carbon dark, is a kind of unformed carbon. It??s a light, loose and extremely fine black greasepaint with a veritably large face area ranging from 10 to 3000m2/g. It??s an deficient combustion of carbonaceous substances( coal, natural gas, heavy oil painting, energy oil painting,etc.) under conditions of inadequate air. Or products deduced from thermal corruption. Those made from natural gas are called?? gas dark??, those made from oil painting are called?? beacon black??, and those made from acetylene are called?? acetylene black??. In addition, there are?? trough black?? and?? furnace black??.

Chromium oxide is a basic inorganic chemical raw material. Its chemical name is chromium trioxide, Cr2O3. It belongs to the trigonal crystal system. If a hexagonal unit cell is taken, the unit cell parameters are 4.960x 4.960??13.584 and the axial ratio is 4.473. Cr2O3 has a ??-Al2O3 structure. This rigid crystal is composed of oxygen ions that are closely packed and M3+ ions fill the octahedral gaps formed by these close packings.It is known that the ionic radii of Cr3+ and O2- are 0.069nm and 0.132nm respectively, and the ratio of positive and negative ionic radii is 0.52, in the range of 0.414~0.732. Therefore, the coordination number of Cr3+ is 6, so it is in the octahedral gap.