Novel process for recycling waste leather-making liquid step by step

A waste liquid recycling and waste liquid technology, applied in application, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. Coarse, "hairy surface" and other problems, to achieve the effect of saving energy

Active Publication Date: 2010-12-22
宝斯卡(商丘)化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is an extremely complex and difficult problem to realize the recycling of waste water from raw hides to blue hides at one time, and it is often accompanied by the following problems: the weight gain rate of gray hides and the yield rate of blue hides are both reduced by 1.5% %-3.5%, the shrinkage temperature drops by 1.5°C-3.5°C, and the grain surface of the blue leather will be damaged, the grain surface will become thicker, the color will become darker, and even the phenomenon of "hair surface" will occur

Method used

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  • Novel process for recycling waste leather-making liquid step by step

Examples

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Embodiment 1

[0028] As shown in the figure, in the pre-soaking process, after the raw hide is pre-soaked, the waste liquid is filtered to remove solids and then discharged into the pre-soaked waste liquid storage tank, stirred evenly with a stirrer, and then pumped out by an alkali-resistant pump and discharged into the pre-soaked water. Soaking the drum, the process of pre-soaking with pre-soaked water waste liquid is: based on the weight of the original skin, add 200% of the pre-soaked water waste liquid, add 0.25% fungicide, rotate the drum for 15 minutes, and then add 0.35% soaking aid, 0.2% degreasing agent, the drum rotates for 20 minutes, stops for 40 minutes, combined with rotation and stop for 4 times, and the waste water after presoaking is discharged into the liquid storage tank. In the main immersion process, the main immersion waste liquid is filtered to remove solids and then discharged into the main immersion waste liquid storage tank, stirred evenly, then pumped out by an al...

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Abstract

The invention provides a novel process for recycling waste leather-making liquid step by step, which is characterized by carrying out waste liquid recycling step by step in the procedures of presoaking, soaking, liming, deliming for softening and pickling for chrome tannage. The waste liquid in all the procedures are recycled in a whole sealing way. The invention realizes the wastewater recycling from original leather to wet blue leather and can ensure the quality of the wet blue leather at the same time, greatly save cost on pollution control and material decomposing and greatly reduce sewage discharge.

Description

technical field [0001] The invention relates to the field of recycling waste water in the leather industry. Background technique [0002] Our previous invention: a step-by-step recycling process of tannery waste liquid did not realize the recycling of pre-soaked water waste liquid and re-liming waste liquid, so the waste water discharge was relatively large. At present, pre-soaked water and re-liming waste liquid have been recycled. Water consumption and wastewater discharge are further reduced, and parameters are improved in the recycling of wastewater in other processes. If the use of acetic acid is increased, the deashing waste liquid is more conducive to circulation. In addition, the use of cationic fatliquor is eliminated in the pickling chrome tanning process, and the pH value is adjusted. And further reduce the use of some chemical materials, such as alkali extractor, chrome powder, softening enzyme, fatliquoring agent and so on. [0003] The production process fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02C14C1/00C14C1/08C14C1/06C14C1/04
Inventor 张壮斗
Owner 宝斯卡(商丘)化工有限公司
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