hercynite मीनिंग इन हिंदी

उदाहरण वाक्य

1. Hercynite is a spinel of regular symmetry and normal cation distribution, but some disorder occurs in its structure.
2. It consists of ferrous ( Fe2 + ) ions and aluminium ions, however some Fe3 + may be located in the structure of hercynite.
3. The reduction step of the hercynite reaction takes place at temperature ~ 200 o C lower than the traditional water splitting cycle ( 1200 o C ).
4. The disadvantages of the ferrite cycles are : similar reduction and melting temperature of the spinels ( except for the hercynite cycle as aluminates have very high melting temperatures ), and slow rates of the oxidation, or water splitting, reaction.
5. Among accessory minerals, in addition to apatite, zircon, and iron oxides, the following may be mentioned : hornblende ( not common ), riebeckite ( rare ), epidote and zoisite, calcite, sphene, andalusite, sillimanite, kyanite, hercynite ( a green spinel ), rutile, orthite and tourmaline.
6. The endothermic reduction step ( 1 ) is carried out at high temperatures greater than 1400 o C, though the " Hercynite cycle " is capable of temperatures as low as 1200 o C . The oxidative water splitting step ( 2 ) occurs at a lower ~ 1000 o C temperature which produces the original ferrite material in addition to hydrogen gas.