Dear Shukla jee, Chromite ...
Published by Prem Baboo, Researcher at www.researchGate.net
Dear Shukla jee,
Chromite mining can create hostile conditions for organisms in the surrounding environment.
Hexavalent chromium is a form of the metallic lement chromium . Chromium naturally occurs in rocks, animals, plants, soil, and in volcanic dust and gases. ... Hexavalent chromium , or Chromium (VI), is generally used or produced in industrial processes,
Chemistry of the Treatment Processes
Chromium Removal Chemical Reaction The chemical reaction for reduction of hexavalent chromium to trivalent state with sodium Meta bisulphite at a PH range of 2.0 to 3.0 takes place stoichiometric ally and is an instantaneous reaction according to the following equations.
4 H2CrO4 + 3 Ca(OH)2 + 3 H2SO4 = 2 Cr2(SO4)3 + 3 Na2SO4 + 7 H2O
The Trivalent Chromium is removed as chromium hydroxide by precipitation it with lime at PH 8.5 to 9.0 as follows.
Cr2(SO4)3 + 3 Ca(OH)2 = 2 Cr(OH)3 +3 CaSO4