A leather production process

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 invention relates to a tanning production process, in particular to a sulfur-free, ash-free, ammonia-free and low-salt production process in the field of leather processing. Background technique: [0002] Tannery sludge is currently a headache problem commonly faced by tannery enterprises in production. At present, the country pays more and more attention to the environment of the whole society. The environmental indicators of sewage, sludge, waste gas and ammonia nitrogen discharged by tanning enterprises are getting higher and higher. Many small businesses have closed down one after another due to their inability to handle them. Higher requirements and challenges are also put forward for the sludge treatment capacity and process methods of medium and large tannery enterprises. [0003] The chrome tanning method has been in the dominant position for its superior tanning performance for more than 100 years, and sodium sulfide (or sodium hydroge...

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.