Reduction of discharged chrome by the application of hexamine in pickling
1995
Mizutani, M. (Hyogo-ken. Industrial Research Inst., Kobe (Japan)) | Nakagawa, K. | Mohri, N.
The partial substitution of hexamine for chrome tanning agents was examined in order to reduce the amount of discharged chrome from tanneries. For this purpose, hexamine was applied in the pickling process pre-tanning. Then, the behavior of pH values in pickling and tanning liquor, chrome concentration, and the chrome content and shrinkage temperature (Ts) of pickled pelts and chrome leathers were examined. Leather qualities wee evaluated and the quantity of removed chrome from chrome leather was also assayed. Hexamine raised the Ts of pickled pelts and the pH of tanning liquor. The amount of chrome in the remaining tanning liquor was diminished drastically, however, the Ts of this leather was high. Moreover, on the whole, the quality of this leather was also approximately equal to that of the control. The quantity of removed chrome from chrome leathers produced using hexamine was much lower than that of the control
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