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Ashless (or less-ash) liming unhairing process by recycling waste lime liquor indefinitely

A technology of liming and waste liquid, applied in application, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve damage, environmental pollution, waste of resources, etc. question

Active Publication Date: 2012-07-04
宝斯卡(商丘)化工有限公司
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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
Liming waste liquid contains grease and its decomposition products, salts, lime, liming agent, S 2- , OH - 、Na + , Ca 2+ , protein and its decomposition products, enzymes and amines, etc. Among them, in general, the residual lime in the waste liquid is usually 37%-55% of the initial amount, and the residual Na in the waste liquid 2 The S content is usually 2.4g / 1-3.2g / l. If the waste ash liquid is discharged randomly, it will not only cause great pollution to the environment, but also cause a great waste of resources.
[0003] At present, domestic and foreign methods of treating waste ash liquid 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

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Effect test

Embodiment

[0010] The process is: 70% waste ash liquid, turn for 10 minutes; 0.3% NaHS, turn for 30 minutes / stop for 30 minutes, then turn for 30 minutes; 70% waste ash liquid, turn for 10 minutes; 0.3% NaHS 2 S, 0.5% NaHS, 0.5% liming aid, 0.4% ash, turn for 30 minutes; 0.3% NaOH, add twice, 15 minutes each time, stop for 20 minutes, and then start to filter wool; 70% waste ash liquid, Turn for 10 minutes; 0.35% NaHS, 0.7% liming aid, 0.4% NaOH, add twice, 15 minutes each time, stop for 30 minutes, then turn for 30 minutes / stop for 30 minutes; 100% waste ash liquid, turn for 10 minutes minutes; 0.7% liming aid, 1.0% NaOH, add four times, 15 minutes each time, stop for 30 minutes, then turn for 5 minutes / stop for 25 minutes, 30 times in a row.

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Abstract

The invention provides an ashless (or less-ash) liming unhairing process by recycling waste lime liquor indefinitely, which is characterized in that all waste liquor can be recycled indefinitely, and a liming effect is better than that in a conventional process. Use quantity of lime and other liming materials is greatly reduced, 50%-100% of lime is saved, and 40%-60% of other relevant materials are saved.

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. A new ashless or ash-less tanning process for indefinitely recycling waste liquid for liming is introduced here. 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. Liming waste liquid contains grease and its decomposition products, salts, lime, liming agent, S 2- , OH - 、Na + , Ca 2+ , protein and its decomposition products, enzymes and amines, etc. Among them, in general, the residual lime in the waste liquid is usually 37%-55% of the initial amount, and the residual Na in the waste liquid 2 The S content is usually 2.4g / 1-3.2g / l. If the waste ash liquid is discharged randomly, it will not only c...

Claims

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Application Information

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