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Sheepskin leather making process with infinite cycling of waste liquid for liming (or restoring ash alkalinity)

A technology of liming and waste liquor, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, chemical treatment before tanning, etc., can solve the problem of low efficiency and high cost , environmental pollution, etc.

Active Publication Date: 2015-05-20
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, lime, liming agent, S 2- 、Na + , Ca 2+ , protein and its decomposition products, 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 also very high. 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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Effect test

Embodiment

[0010] The operation steps of liming by using waste ash liquid: firstly, cover lime and alkali, use traditional lime and Na2S to prepare depilatory paste, carry out manual coating, after a certain period of time, manually pluck the hair, and then carry out liming. Based on raw hide weight, 150% waste ash liquid, 0.3% NaHS, 0.5% penetrant, turn for 20 minutes; 1.2% liming aid, 0.2% degreasing agent, 1.0% ash, turn for 30 minutes / stop for 30 minutes, 2 consecutive times ; 150% waste ash liquid, 3.0% ash, turn on for 30 minutes / stop for 30 minutes, then turn for 5 minutes / stop for 99 minutes, 11 times in a row.

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Abstract

The invention provides a sheepskin leather making process with infinite cycling of waste liquid for liming (or restoring ash alkalinity). The invention has the following characteristics: infinite recycling of all the waste liquid is realized, a liming effect is better than that of a conventional process, usage amount of lime and other liming materials is substantially reduced, lime is saved by 50 to 100%, and other related materials are saved by 40 to 60%.

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 tanning process for ash-free or less ash-recycled waste liquid for indefinite recycling of sheepskin for liming 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. Liming waste liquid contains grease and its decomposition products, lime, liming agent, S 2- 、Na + , Ca 2+ , protein and its decomposition products, 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 also very high. If the waste ash liquid is discharged arbitrarily, it will not only cause great poll...

Claims

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Application Information

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Patent Type & Authority Patents(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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