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Information @ a Glance

General 

  • Sodium dichromate is a very strong oxidizing agent; it attacks almost all oxidizable materials including finely divided metals, often violently and with fire and/or explosive results. In the presence of acetic acid, the reaction is sometimes delayed for a time, and when it does take place, the reaction can be uncontrollable.

Manufacturing Process

  • The process of sodium dichromate production by roasted chromite with lime and leaching with sodium bicarbonate solution under the pressure of carbon dioxide was a cleaner process. The conversion rate attained 82.5% under the conditions, CaO/Cr2O3 = 2, 7000C, 3 hours.

Market

  • Leather tanning consumption of sodium bichromate is 12 percent of the total demand. U.S. production of tanned hides reached a low in 1989 but has recovered by almost doubling since then. The fastest-growing and potentially largest markets for leather in the U.S. are those for auto and furniture upholstery.
  • Consumption of chromium chemicals has been in decline since peaking at 163 thousand tons in 1974. This is primarily due to environmental and health concerns. The trend has apparently now ceased and the current consumption level represents difficult-to-substitute applications of chrome chemicals. Over the next four years, U.S. sodium bichromate consumption is anticipated to grow modestly, at 0.5 percent annually.

Application

  • Sodium dichromate, converted from sodium chromate, is the primary feedstock for the production of chromium- containing chemicals and pigments. Chromium-containing chemicals (e.g., chromic acid, basic chromium sulfate, tanning compounds) are used in chromium plating, etching, leather tanning, water treatment, and as catalysts. Other uses of chromium-containing chemicals are in drilling operations to provide drilling mud fluidity and in wood preservative processes to bind copper and arsenic to wood.
  • Some applications of sodium bichromate are : Pigment industry; Protection of metals against corrosion; Leather, textile and dye stuff industries; Organic syntheses; Timber protection; Manufacture of most chromium derivatives.

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