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Tanning process for deashing and softening by indefinitely recycling waste liquor

A technology of deliming and waste liquid, applied in application, chemical treatment before tanning, small raw hide/large raw hide/leather/fur treatment, etc., can solve the problems of resource waste ecology, environmental pollution, damage and so on

Active Publication Date: 2014-05-28
宝斯卡(商丘)化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0009] Set up a deashing and softening waste liquid storage tank next to the deashing and softening drum. The waste liquid from the deashing and softening process is filtered to remove solids in the waste liquid and then discharged into the deashing and softening waste liquid storage tank. Stir evenly and use acid The pH value of the material is adjusted to 8.0 for the deliming and softening of the next batch of skins; the process of deliming and softening the deliming and softening waste liquid is: adding 150% waste liquid by gray skin weight, and the liquid temperature is 27 ℃, add 0.3% degreasing agent, 0.8% deliming agent, 1.0% ammonium sulfate, 0.3% hydrochloric acid, 0.3% acetic acid, control the pH value at about 8.0, rotate the drum for 20 minutes, add 0.1 softening enzyme, and rotate for 30 minutes. After deashing and softening, the waste water is discharged into the liquid storage tank. The amount of protease and microorganisms in the waste liquid should be detected ...

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Abstract

The invention provides a tanning process for deashing and softening by indefinitely recycling waste liquor. The process is characterized in that: deashing and softening are performed in the same bath so as to save lots of chemical materials, for example, macerating enzyme is saved by 50 to 100 percent, ammonium salt, deliming agent and the like are saved by 40 to 80 percent; and the used temperature is remarkably lower than the conventional temperature, and all the waste liquor can be indefinitely recycled. Therefore, the environmental pollution caused by the deashing and softening process can be basically eliminated.

Description

technical field [0001] The invention belongs to the green recycling process of making full use of raw materials to reduce pollution discharge in the technical field of leather production. Here, a tanning process of infinitely recycling waste liquid for deashing and softening 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. Deliming and softening wastewater is one of the most polluted wastewater in tanneries, which contains a large amount of ammonia nitrogen. If it is discharged directly, it will pose a great threat to the environment. Recycling deliming and softening wastewater not only eradicates pollution, but also greatly reduces chemical The use of materials saves more than 50% of the cost. Contents of the invention [0003] The purpose of the present invention is ...

Claims

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Application Information

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IPC IPC(8): C14C1/08
Inventor 张壮斗
Owner 宝斯卡(商丘)化工有限公司
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