How is potassium dichromate prepared from chromite ore?

Question: How is potassium dichromate prepared from chromite ore?

Potassium dichromate, a chemical compound with the formula K2Cr2O7, is commonly prepared from chromite ore (FeCr2O4) in a two-step roasting and leaching process. Initially, chromite ore is mixed with sodium carbonate and lime, and then roasted in air to convert the chromium into a water-soluble form. This reaction yields sodium chromate (Na2CrO4), which is then leached out with water. In the subsequent step, the solution of sodium chromate is treated with sulfuric acid and potassium chloride to precipitate chromium as potassium dichromate. The solid potassium dichromate is then filtered, dried, and purified for use in various applications such as pigments, tanning, and as an oxidizing agent in laboratories.

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