Conservation of Chromium in the Tanning Industry.
Proc 4th Recycling World Cong & Expo New Orleans Louisiana 1982 Apr; :M/3/2/1-m/3/2/17
The tanning industry uses trivalent chromium in the form of water soluble chromium sulfate for the tanning of hides and skins that are byproducts of the meat industry. The U.S. total demand for dichromate in 1976 was 161,00 tons and the tanning industry used 17% or one-sixth of this amount. The waste generated was 9% or one- eleventh of the U.S. total demand. Because of the concern about chromium usage and waste, the Bureau of Mines and Tanners Council of America Inc. made a study of conservation of chromium in the tanning industry. The chromium wasted is present in leather trimmings and shavings, in the effluents from process procedures, and in sludge generated. Ways to recycle the effluent chromium and to recover the chromium from solid waste will be discussed including the possibility of using the chromium-bearing shavings and trimmings with pelletized stainless steel waste in the steel mill. From bench- scale experiments conducted, it was determined that the most economically feasible way to recover chromium from solid waste is by incineration.
Proc. 4th Recycling World Cong. & Expo, New Orleans, Louisiana, Apr. 5-7, 1982, PP. M/3/2/1-m/3/2/17