Peculiarities of neutralization of lime-free pelt obtained using sodium aluminate

Abstract

Sodium aluminate can be used as an alternative to calcium hydroxide for qualitative unhairing of hide. Due to the absence of calcium compounds in the derma of the unhaired pelt, less-ammonia and non-ammonia methods of pelt neutralizations were tested. The experiments have shown the possibility to use almost two times less ammonia sulphate than conventionally or boric acid for qualitative neutralization of the pelt obtained using sodium aluminate. The pelts neutralized by both methods can be pickled and chromed conventionally, and properties of these pelts after chroming are close to the chromed leather produces by control method.