| Basic Chrome Sulphate is the most important ingredient used in the tanning of leather. It is manufactured from the simple reduction of Cr (VI) to Cr (III) by the addition of an excess of sulphur dioxide: Na2Cr2O7 + 3SO2 + H2O ? Cr2(SO4)2(OH)2 + Na2SO4 This reaction is carried out in a steam-heated vessel, and then the excess SO2 is removed in a second reaction tower. Finally, the liquid product is spray-dried to form a powder which is then bagged and sold. As dichromate is a highly poisonous compound, all emissions from the plant are closely monitored and all sump water is recycled and the chromium within it reused.Information provided by Ganpati Exim PVT. LTD. |
