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

A waste liquid and process technology, which is applied in the fields of application, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve the problem of high cost, difficult treatment, poor effect and ineffective reach and other issues

Active Publication Date: 2012-07-04
张壮斗
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AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0010] Use sulfuric acid or other acid substances to adjust the pH value of the retanning waste liquid to 0.7-3.5, and then carry out retanning. The process is: 150% retanning waste liquid, temperature adjusted to 36°C, 0.3% formic acid, drum rotation for 30 minutes, 1.5% acrylic retanning agent, rotation for 30 minutes, 1.0% chrome powder, 0.3% fatliquoring agent, rotation for 60 minutes Minutes, 1.0% fatty aldehyde, turn for 30 minutes, 0.8% sodium formate, 0.2% baking soda, turn for 60 minutes, turn for 10 minutes / stop for 50 minutes, 5 times in a row.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02
Inventor 张壮斗
Owner 张壮斗
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