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Leather making process for retanning by indefinitely recycling waste liquid

A waste liquid and process technology, applied in the application, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. pollution, etc.

Inactive Publication Date: 2011-03-16
张壮斗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such discharge of waste chrome solution with high content 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] The process is: 150% waste retanning liquor, temperature adjusted to 36°C, 0.3% formic acid (or acetic acid), drum rotation for 30 minutes, 1.5% acrylic retanning agent (or other retanning agent), rotation for 30 minutes, 1.0 chromium Powder, 0.3% fatliquor, turn for 60 minutes, 1.0% fatty aldehyde, turn for 30 minutes, 0.8 sodium formate (or sodium acetate), 0.2 baking soda, turn for 60 minutes, turn for 10 minutes / stop for 50 minutes, 5 times in a row, or Stop the drum overnight, and the pH value should be 3.7-4.0.

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Abstract

The invention provides a leather making process for retanning by indefinitely recycling waste liquid. The process is characterized by greatly reducing the using amount of chromium powder and other retanning materials by 40 to 60 percent, and realizing indefinite recycling of all waste liquids, and the retanning effect is better than that of the conventional process.

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. Chrome tanning wastewater is one of the most polluted wastewater in tanneries, and it is the only heavy metal pollution in it. However, chrome tanning can endow leather with excellent performance and has always been the mainstream technology of leather tanning, which is almost unshakable. In the chrome tanning process, the effective utilization rate of chromium is generally only 60%-70%, and the remaining 30%-40% of chromium salt remains in the waste wa...

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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