SiO2 byproducts: CO; redn.; CrF6 contains some HF and O2; in china tube; 8.39percent Cr, 31.69percent Cr2O3, 48,53percent SiO2, 11.39percent C contg. black residue over the products;

SiO2 byproducts: CO; redn.; CrF6 contains some HF and O2; in china tube; 8.39percent Cr, 31.69percent Cr2O3, 48,53percent SiO2, 11.39percent C contg. black residue over the products;

CrF6 contains HF and O2; in a pot covered 6 parts of Al2O3 and 1 part of KCl; iron vessel, 900-1000°C; hardly any reaction;