Novel tanning process capable of conducting retanning by recycling waste liquid infinitely

Abstract

The invention provides a novel tanning process for conducting retanning by recycling waste liquid infinitely, which is characterized in that use quantity of chromium powder and other retanning materials is greatly reduced and can be saved by 40% to 60%, all waste liquid can be recycled infinitely, and a retanning effect is better than that in a conventional process. Compared with a patent of an invention (application NO.: 201010174617.7), users can greatly adjust variety and other parameters of chemical materials in the process according to requirements, such as a pH value is adjusted from 0.4-2.5 to 0.7-3.5.

Description

technical field [0001] The invention belongs to the green recycling process of making full use of raw materials and reducing pollution discharge in the technical field of leather production. Herein, a leather-making process of retanning by recycling waste liquid indefinitely is introduced. Background technique [0002] Today, China has become a world-recognized leather producing country, but the rapid development of the leather industry has also caused serious environmental pollution, waste of resources and ecological damage. Retanning waste liquid is also one of the important wastewater in the process of tanning, and chromium pollution is one of the most serious pollution of retanning waste liquid, and the Cr in the waste liquid 2 o 3 The content is as high as 1000mg / L-2000mg / L, and it is difficult to control. If it is discharged arbitrarily, it will not only cause great pollution to the environment, but also cause great waste of resources. [0003] At present, domestic a...

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Problems solved by technology

[0002] Today, China has become a world-recognized leather producing country, but the rapid development of the leather industry has also caused serious environmental pollution, waste of resources and ecological damage

Retanning waste liquid is also one of the important wastewater in the process of tanning, and chromium pollution is one of the most serious pollution of retanning waste liquid, and the Cr in the waste liquid 2 o 3 The content is as high as 1000mg / L-2000mg / L, and it is difficult to control. If it is discharged arbitrarily, it will not only cause great pollution to the environment, but also cause great waste of resources

[0003] At present, domestic and foreign methods of treating chromium-containing wastewater mainly include: chemical reduction method, electrolysis method, membrane separation method, adsorption method, ion exchange method, biological method, etc., but the operation process is often costly, low in efficiency, and poor in effect. Unable to achieve the real purpose of pollution control