Why we need to concern about the increased pollution level in environment ?
Class 9th
Answers
Answered by
1
Answer:
we need to concern about increasing level of population in environment because if the population will increase the demands also will be increased so we need to think about it and an process audit
Answered by
1
Answer:
Environmental pollution caused by fluorine emissions during H2SO4 roasting of bastnaesite processing in China is becoming of increasing concern (Bian et al., 2011). Because of this, processes have been developed to prevent the emission of fluorine. A first method revolves around only leaching the carbonate REE while leaving the REE fluorides in the residue. This is achieved by thermally activating the ore (400 °C for 3 h) and then leaching it with HCl. Thermal activation enables leaching of the carbonates at conditions in which the fluorides are unaffected. The reported leaching efficiency of this process is 94.6% for the carbonates and 0.07% for the fluorides
Explanation:
Similar questions