CN85100819A - New pollution-free tanning technology - Google Patents
New pollution-free tanning technology Download PDFInfo
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- CN85100819A CN85100819A CN 85100819 CN85100819A CN85100819A CN 85100819 A CN85100819 A CN 85100819A CN 85100819 CN85100819 CN 85100819 CN 85100819 A CN85100819 A CN 85100819A CN 85100819 A CN85100819 A CN 85100819A
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- tanning
- deliming
- pickling
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- leather
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Abstract
The present invention is that its main points are: sulfide recycles to the change of process hides hygrometric state processing operation, and production process does not wash with water, has eliminated sulfonium ion (S
-2) liquid phase pollute; Reduce lime consumption, the slag pin is handled.Solved sulfonium ion (S
-2) solid phase pollute.Heavy leather is by reclaiming, and light leather has been eliminated sulfonium ion (S by oxidation
-2) gas phase pollution.Because recycling of chrome tanning liquid solved trivalent chromic ion (Cr in the light leather
+ 3) and the pollution of salt.The present invention with decontamination, improve the quality, simplify technology, in addition in operation with reduce cost and organically unite, have economic benefit and social benefit significantly.Be adapted to big or small all kinds of process hides factory.
Description
The present invention relates to the whole hygrometric state operation of leather industry, comprise immersion, depilation, liming, deliming, softening, pickling, each operation of tanning.
Sulfonium ion (S
-2) be the main depilation material of tanning industry, and sulfonium ion (S
-2) be again that a kind of mortality is poisoned to people and biology, therefore solve sulfonium ion (S
-2) be the problem of domestic and international process hides and environment specialist's primary study to the pollution of environment.China is because the attention of government has also dropped into substantial contribution.What study often at present is: blodisc; Jet gas; Catalytic oxygen; Flocculation sediment and acidifying are reclaimed; Chromium ion (Cr
+ 3) be the main raw of light leather tanning in the leather, but be a kind of carcinogenic substance.The chrome liquor alkaline chemical precipitation that generally will give up both at home and abroad at present, filter press, acidifying is multiplexing, operate more complicated, deficiency in economic performance; Salt is a large amount of materials that use of process hides pickling procedure, and abraum salt solution has a strong impact on the growth of farm crop, and the pollution that how to solve the salt pair environment is not also reported at present.
Around chromium ion (Cr
+ 3) and sulfonium ion (S
-2) elimination or the minimizing of polluting, some patent SU962316 are abroad also arranged.Japanese Patent J83019610, U.S. Pat 4377387, U.S. Pat 4457759 are all eliminated with diverse ways or have been alleviated chromium ion (Cr
+ 3) or sulfonium ion (S
-2) individual event of environment is polluted, perhaps only alleviated sulfonium ion (S
-2) gas phase pollution.
The objective of the invention is in leather hygrometric state technological process, to solve sulfonium ion (S simultaneously
-2) liquid phase, solid phase, and gas phase pollution, and chromium ion (Cr
+ 3) and the pollution of salt pair environment.
To the effect that of the present invention: as to add ammoniacal liquor or amino acid during immersion to increase the immersion effect; Depilation recycles with sulfide, does not all wash with water before and after the deashing and softening, in order to solve sulfonium ion (S
=) liquid phase pollute; Reduce lime consumption 80～90%, simultaneously slag pin chlorine (Cl
2) handle, solve the solid phase of sulfonium ion and pollute; Heavy leather reclaims hydrogen sulfide (H with liquid caustic soda when pickling
2S), light leather adds dichromate in order to solve sulfonium ion (S when deliming
-2) gas phase pollution; Not with salt (NaCl), tanned old liquid recycles during pickling, and this has just solved the pollution of salt and trivalent chromic ion; Heavy leather adopts the pretan of alkaline synthetic tanning material disacidify, and light leather uses the sulphite reduction, is that the present invention at first adopts in process hides.
The present invention has compared following advantage with existing other technologies: decontamination in the course of processing, rather than add complex apparatus again after the discharging of waste liquid and handle.The material of decontamination is exactly the necessary material of process hides basically, does not therefore need extra Master Cost.Adapt to various raw materials such as ox-hide, sheepskin, pigskin, also adapt to various types of kinds such as light leather, heavy leather.Thereby has vitality widely.Go into drum from graywall and finish by once to tanning, the centre does not wash with water, and as calculated, preceding operation can be saved man-hour 26%, and economical with materials takes 60%, saves process water more than 60%.Accelerate tanning speed, become grain trickle, the body bone is plentiful, is better than the normal process product.This technology is slightly effectively softening, and severe is softening does not hinder, can the high temperature pickling, lay the foundation for producing high-grade light, thin moccasin leather.Available large-scale stroke of pond produces, and saves equipment in a large number, and the investment and the energy are for real prospect has been opened up in time variable control and the production automation.The present invention is the change significantly to traditional technology, thereby has its corresponding theory value.Decontamination can be improved the quality, simplify technology, be easy to control and reduce cost organically unite, have tangible economic benefit and social benefit, be applicable to big or small all kinds of process hides factory.
Adopt the enforcement of best method of the present invention
Example 1.: to the working method of goatskin:
The immersion skin is coated with alkali:
Identity position Na
2S 35～42 grams per liters divide large, medium and small carrying out
The part between the ribs and the hips position, limit Na
2S 18～20 grams per liters
Concentration of slurry 20～22Be
Bank up 4～6 hours time
Working method is with original producing and manufacturing technique
Push away big hair: require identically, weigh after the depilation with original technological operation.
Caustic dip:
2.5～3 times of liquid coefficients
Na
2S 6～8 grams per liters
Time: rotated 30 minutes, and forced dried alkali lye to park 2.5～3 hours.
Liming:
The liquid coefficient utilizes the circulation lixivium for 2.5～3 times
Na
2S 0.3～1 grams per liter concentration 10～14BrK
Operation was rotated 12～14 hours continuously, 6 rev/mins of rotating speeds.
Go out drum.
Graywall is cut meat.Manage little Mao.Weigh.
Dealkalize:
HCl 3.5% pH value is 7～7.5.
Working method: earlier the useless chrome liquor slagging-off back of circulation usefulness is got 1.5 times by tare weight before throwing skin, 2.5% the sodium dichromate 99 (Na that tares then
2Cr
2O
7) pour in the useless chrome liquor and stir evenly, transfer this solution PH 7～8 with ammoniacal liquor, skin is dropped in the solution, shutting drum door changeed 30 minutes, surveying pH value is 10 ± 0.5 o'clock, the hydrochloric acid dilute with water is added at twice in the drum again, adds once in 10 minutes at interval, survey pH value after 20 minutes and be 7～7.5 and end, heat up 38～40 ℃ and soften.
Softening: as in dealkalize liquid, to carry out.
Industry pancreatin 0.1%
1.5～2 hours time
PH value requires between 7～7.5.
Pickling: in bating liquor, carry out
Hydrochloric acid 5.5～6%
PH value is 2.5～2.8
Working method:, rotated 2 hours with once adding behind the hydrochloric acid dilute with water from the drum eye.
Tanning: hydrochloric acid 2.4%
Burnt sodium 2.8%
Ammonium hydroxide 2～3%
PH value is 3.3～4.2
Working method: HCl0.5% rotated 15 minutes, and burnt sodium 0.5% changeed 15 minutes minutes, and HCl0.5%, burnt sodium 0.5% rotate.HCl0.4% changeed 20 minutes, and burnt sodium 0.4% changeed 20 minutes, HCl0.4, burnt sodium 0.4%, and HCl0.3% commentaries on classics 25 minutes, burnt sodium 0.3% changeed 25 minutes, HCl0.3%, burnt sodium 0.3%, burnt sodium 0.4% changeed 5 minutes.
Carry alkali: industrial ammonia 1～3% decide according to the pH value in when reduction, slowly dropping behind the dilute with water.PH value heats up between 40～45 ℃ after reaching specified requirement, rotates continuously 5～6 hours, surveys to go out drum more than TS95 ℃, takes horse.
Embodiment 2: the bottom leather technology point
1. circulation depilation liming
2. basic protein enzyme bating
3. (solution uses repeatedly) reclaimed in pickling
NaCl supplies 7%
HCl 2.5～3%
Aspartic protease 5～10 units
Liquid coefficient 2～3
4～8 hours time
4. disacidify gives and tanning
Alkalescence synthetic tanning material 5%
Liquid coefficient 0.5
Rotated 4～6 hours
5. washing
6. normal tanning
Claims (4)
1, the craft of hygroscopic state of leather producing of forming by series of processes such as immersion, depilation, liming, deliming, pickling, tannings, this technology is used sulfide depilation, and large quantities of lime slurry hole is used in liming, and a large amount of sulfur-containing anion [S are arranged after the liming
=] lime-ash, reduction along with pH value from the deliming to the pickling produces hydrogen sulfide poison gas, and deliming, softening front and back need repeatedly to wash, and each adding salinity is 7% of a tare weight during pickling, add tanning agent during tanning, used solution all discards after depilation, liming, deliming, softening, pickling, tanning.
Feature of the present invention is: add ammoniacal liquor or amino acid during (1) described soaking process;
(2) described sulfide recycles;
(3) deliming, softening front and back are without washing;
(4) described lime white breast only is common 10～20%;
(5) described lime-ash chlorine oxidation;
(6) in described deliming operation, add old liquid and oxygenant;
(7) described softening process carries out in owse;
(8) described pickling procedure uses hydrochloric acid;
(9) in described tanning operation, add reductive agent;
(10) described owse recycles.
2, according to the described oxygenant of claim 1., the dichromate that is characterized as of the present invention.
3, according to the described reductive agent of claim 1., sulphite and the bisulfite of being characterized as of the present invention.
4, according to claim 1. described in the tanning operation of the present invention being characterized as for heavy leather adopt alkaline synthetic tanning material disacidify top to tan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585100819A CN85100819B (en) | 1985-04-01 | 1985-04-01 | New pollution-free tanning technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585100819A CN85100819B (en) | 1985-04-01 | 1985-04-01 | New pollution-free tanning technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100819A true CN85100819A (en) | 1986-08-27 |
| CN85100819B CN85100819B (en) | 1988-08-10 |
Family
ID=4791444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198585100819A Expired CN85100819B (en) | 1985-04-01 | 1985-04-01 | New pollution-free tanning technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100819B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120664A (en) * | 2010-01-11 | 2011-07-13 | 张壮斗 | Process for recycling tanning waste liquid by steps |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234753B (en) * | 2007-02-02 | 2010-05-19 | 中国皮革和制鞋工业研究院 | Method and apparatus for recovering sulfide and protein from depilation waste liquor |
-
1985
- 1985-04-01 CN CN198585100819A patent/CN85100819B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120664A (en) * | 2010-01-11 | 2011-07-13 | 张壮斗 | Process for recycling tanning waste liquid by steps |
| CN102120664B (en) * | 2010-01-11 | 2014-04-09 | 张壮斗 | Process for recycling tanning waste liquid by steps |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100819B (en) | 1988-08-10 |
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