Resources-saving Chromium Tanning of Leather with the Use of Modified Montmorillonite

It is described in the paper that twofold decrease in consumption of chromium tanning agent may be achieved by combined use of montmorillonite modified with hydroxychromium solutions and basic chromium sulphate at the following ratio: chromium oxide (III) : montmorillonite = 1 : 2. The semi finished item obtained exceeded reference samples by its physical-mechanical properties. The technology developed may be characterised as having better environmental efficiency and resources saving because of 3,2-4,6 times lower chromium oxide (III) content in the spent solution.