Tanning production technology

Abstract

The invention relates to a tanning production technology. The tanning production technology includes the following sequential steps of soaking, fleshing, depilating, hair shoveling, alkali expanding, splitting, dealkalizing, softening, pickling and tanning; then production is conducted according to a conventional chrome tanning follow-up technology; in the preparing process, a novel ash-free and sulfur-free technology is adopted, generation of sulfides is avoided, sludge generated when lime powder is used is avoided, and the sludge discharging problem of an enterprise is solved; and an ammonia-free dealkalizing and subsalt technology is adopted in the tanning process, so that ammonia nitrogen discharging and industrial salt discharging pollution is greatly reduced. By means of the novel sulfur-free, ash-free, ammonia-free and subsalt technology, produced leather is soft in hand feel and good in fullness, all indexes of the produced leather reach EU standards, and the produced leather is exported to Europe and receives consistent praise from users.

Description

Technical field: [0001] The present invention involves a kind of lack of sulfur, ash, ammonia -free, and low -salt production technology in the field of leather processing. Background technique: [0002] Clearing sludge is currently a headache that is generally facing in production.At present, the country's emphasis on the entire society is stronger and stronger.The environmental protection indicators of sewage, sludge, exhaust gas, and ammonia nitrogen discharged by the tingling enterprises are getting higher and higher.Many small companies have closed down because they are unable to deal with.Higher requirements and challenges have also been put forward on the sludge processing capacity and process methods of medium and large -scale cities. [0003] For more than a hundred years of chromium tanning method, with its superior tanning performance, it has always occupied its dominance, and uses sodium sulfide (or sodium sulfide) to remove hair and expand sodium sulfide lime.The mo...

AI Technical Summary

Problems solved by technology

The consequence of the use of these two materials is that a large amount of sulfide exceeds the standard and lime produces a large amount of tanning sludge. At the same time, it requires huge costs to treat a large amount of sewage, waste gas, and sludge, which greatly reduces the profit margin of the enterprise.