CN102120664A - Process for recycling tanning waste liquid by steps - Google Patents
Process for recycling tanning waste liquid by steps Download PDFInfo
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- CN102120664A CN102120664A CN2010100038852A CN201010003885A CN102120664A CN 102120664 A CN102120664 A CN 102120664A CN 2010100038852 A CN2010100038852 A CN 2010100038852A CN 201010003885 A CN201010003885 A CN 201010003885A CN 102120664 A CN102120664 A CN 102120664A
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Abstract
The invention provides a process for recycling tanning waste liquid by steps, which is characterized in that the waste liquid recycling is carried out by steps through main soaking, liming, deliming and softening, and chorme tanning, wherein the circulation of the waste liquid in the main soaking step is of hemicycle, and the circulation of the waste liquid in the steps of liming, deliming and softening, and chorme tanning is of totally closed circulation. By means of the process provided by the invention, waste liquid recycling is basically realized from original leather to wet blue leather, the quality of the wet blue leather is simultaneously guaranteed, the expense is not increased, the cost on chemical materials is effectively saved, and the sewage discharge is greatly decreased.
Description
Technical field
The present invention relates to leather industry waste water cycling and reutilization field.
Background technology
Production process from raw hide to blue skin is the heavily contaminated stage the whole tanning production, and its blowdown flow rate accounts for total more than 75% of blowdown flow rate in the whole process hides process, and its water quality characteristics is to contain a large amount of complicated components and poisonous, objectionable impurities.Wherein contain a large amount of lime, protein, salt, grease, ammonia nitriding compound, sulfide, chromic salts, hairs, skin slag, silt etc., and COD, BOD are very high.Its pollutant kind is various, the composition complexity, and the big and foul smelling phenomenon of water quality and quantity variation factor is the trade effluent than the refractory reason.
Along with the development of green technology equipment, leather-making waste water has formed the treatment process (seeing the following form) of comparative maturity at present.Height, efficient are low, weak effect can't reach real pollution treatment purpose but its operational process often spends.
| The technology title | Technical superiority | Technological deficiency |
| Traditional activated sludge process | This method is to BOD 5Clearance is more than 90%, and COD is at 60%～80%, and colourity is at 50%～90%, and S is at 85%～98%. | To the need water quality requirement height of disposing of sewage, the incompatibility impact load needs high power and capital cost; Floor space is also big, and general enterprise is difficult to bear; Not good to the ammonia nitrogen treatment effect in the waste water simultaneously. |
| Biological contact oxidation process | To organic removal rate BOD 5About 95 %, COD is about 92%, and S is about 98%. | Be easy to generate obstruction, safeguard also relatively difficulty.In case go wrong, system must out of servicely just can safeguard. |
| Oxidation ditch | To BOD 5Clearance is more than 95%, and S is 99%～100%, and SS is about 75% | The treatment effect instability relatively is suitable for the higher south of temperature, and for the north, winter operation has problem. |
| Double-deck biological filter | To the SS clearance 95%, BOD 598%, COD is 90%, and Cr (III) is more than 96%, and S is at 96 %. | Need to determine suitable reflux ratio, select suitable filtrate, working cost is bigger. |
| The SBR method | SBR technology is to COD, S 2-, SS, Cr clearance be respectively 93.3%, 99.0%, 90.3%, 99.4%. | Working cost is bigger, and the less efficient of scale is lower, safeguards also relatively difficulty. |
Also there is the people that leather-making waste water has been carried out cycling and reutilization at present, but just simply the waste water of a certain operation carried out recycle, all very limited to the minimizing of quantity of wastewater effluent, the saving of changing material, the reduction of production cost etc. like this.If want to realize the disposable whole recyclings of waste water from raw hide to all workshop sections of blue skin, it but is an extremely complicated scabrous problem, and often follow the appearance of following problem: graywall rate of body weight gain, the blue skin yield of leather 1.5%-3.5% that all descends, shrinkage temperature descends 1.5 ℃-3.5 ℃, also can make blue skin grain impaired, the grain chap darkens, even produces " hair side " phenomenon.
Summary of the invention
Purpose of the present invention: realize cycling utilization of wastewater from raw hide to blue skin all process steps; particularly liming and chrome tanning workshop section; waste liquid can unlimitedly recycle; outside removing the normal volatilization under the state of nature and inevitably spilling; the rate of recovery of waste liquid can reach 100%, and guarantees blue cortex amount, makes the big 1-3.5% of blue skin yield of leather; the high 3-12 of shrinkage temperature ℃ (comparing with common process) obtained the blue skin of high-quality.The finished product of Sheng Chaning is removed from office every performance index and is all reached requirement thus, and effectively reduces finished leather loose side rate, has improved the degree of packing of finished leather, and can realize economized material 10-55%, and individual material can be realized saving more than 90%, reduces sewage discharge 70%-85%.
Technical scheme of the present invention is as follows:
A kind of waste leather-making liquid step by step cycling and reutilization technology, it is characterized in that proceed step by step waste liquid cycling and reutilization in main immersion, liming, deashing and softening, chrome tanning process, wherein the circulation of soaking process waste liquid is half circulation, the circulation of liming, deashing and softening, chrome tanning process waste liquid is totally-enclosed circulation, and described technology comprises the steps:
(1) the waste liquid cycling and reutilization of main soaking process: at the other master's immersion waste liquid liquid storage tank that is provided with of main soaking drum, enter main immersion waste liquid liquid storage tank in the waste liquid elimination waste liquid of next autonomous soaking process behind the solid substance, stir, to be ready for use on down the pre-immersion of batch raw hide; The technology of utilizing main immersion waste liquid to soak in advance is: in raw hide weight, be that 1.8-2.2 adds and becomes owner of the immersion waste liquid with the liquor ratio, add the 0.2-0.4% sterilant, rotary drum rotated 15 minutes, add 0.3-0.5% immersion auxiliary agent, 0.2-0.5% grease-removing agent then, rotary drum rotated 20 minutes, stopped 40 minutes, commentaries on classics stops combination and carries out 4 times, and the discharge of wastewater after pre-immersion finishes falls;
The waste liquid cycling and reutilization of (2) liming operation: on liming rotary drum side liming waste liquid liquid storage tank is set,, stirs, to be ready for use on down the liming of batch skin from entering liming waste liquid liquid storage tank behind the solid substance in the liming waste liquid elimination waste liquid of liming operation; The technology of utilizing the liming waste liquid to carry out liming is: in raw hide weight, add 30-90% liming waste liquid, 0.15-0.3% grease-removing agent, 0.1-0.2% Sodium sulfhydrate, rotary drum rotated 30 minutes, stopped 5 minutes, changeed and stopped in conjunction with carrying out 4 times; Add 30-90% liming waste liquid, 0.7-0.8% lime, 0.3-0.4% sodium sulphite, 0.2-0.5% Sodium sulfhydrate, 1.2-1.5% again and must remove from office treasured, rotary drum rotated 40 minutes, stopped 20 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 20-60% liming waste liquid, 0.2-0.5% sodium sulphite, 0.1-0.3% sodium hydroxide, 0.1-0.15% liming enzyme, 0.6-0.8% again and must remove from office treasured, rotary drum rotated 60 minutes, stopped 30 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 10-20% clear water, 1-2.0% lime, change and stopped each 30 minutes, revolution stopped 25 minutes in 5 minutes then, carried out 2 times, and revolution stopped 90 minutes in moving 5 minutes then, spent the night;
(3) the waste liquid cycling and reutilization of deashing and softening operation: at the other deashing and softening waste liquid liquid storage tank that is provided with of deashing and softening rotary drum, from entering deashing and softening waste liquid liquid storage tank behind the solid substance in the waste liquid elimination waste liquid of deashing and softening operation, stir, to be ready for use on down the deashing and softening of batch skin; The technology of utilizing the deashing and softening waste liquid to carry out deashing and softening is: in graywall weight, liquor ratio is 1-1.5, add 0.1-0.3% grease-removing agent, 0.4-0.8% deliming agent, 0.8-1.2% ammonium sulfate, 0.1-0.4% hydrochloric acid, rotary drum rotated 30-50 minute, add the 0.15-0.3% macerating enzyme, rotated 25-40 minute;
(4) the waste liquid cycling and reutilization of chrome tanning process: on chrome tanning rotary drum side the chroming waste liquor liquid storage tank is set, this pond should be deep to underground 3-6 rice in order to temperature control, and standby pool is preferably arranged.From entering the chroming waste liquor liquid storage tank behind the solid substance in the waste liquid elimination waste liquid of chrome tanning process, after cooling, to 0.7-1.4, stir with sour pH value of regulating chroming waste liquor, to be ready for use on down the chrome tanning of batch skin, use the best back overnight of chroming waste liquor; The technology of utilizing chroming waste liquor to carry out chrome tanning is: in graywall weight, add 20-100% chroming waste liquor, 0.2-0.3% mould inhibitor, the 0-3% Industrial Salt, rotary drum rotated 10 minutes, 0.3-0.5% formic acid rotated 0.3-0.5% sulfuric acid 20 minutes, divide two to three addings equally, each 10 minutes at interval, rotary drum rotated 70-100 minute, added the 0.4-0.6% cationic fat liquor, rotated 30 minutes, stopped 1-2 hour; Add the 1-2% chromium powder, rotary drum rotated 30 minutes, added the 1.5-3.5% chromium powder again, rotated 1 hour, add the 0.3-0.7% sodium formiate, changeed 30 minutes, add 0.3-0.5% and carry alkaline agent, rotated 3.5-4.5 hour, after be warming up to 28-32 ℃, add the 20-80% chroming waste liquor, rotated 3-5 hour.
In the above-mentioned technology, each liquid storage tank all is equipped with whipping appts.Graywall after liming carries out fleshing and split, and the waste collection that produces in fleshing and the split process is gone into liming waste liquid liquid storage tank in order to cycling and reutilization.Micromicro after deashing and softening operation and chrome tanning process processing is to remove conventional water-washing step from.
Initial waste liquid used in the present invention comes from traditional main immersion, liming, deashing and softening, chrome tanning process respectively, and the formation situation of various waste liquids is well known by persons skilled in the art.In general, contain immersion agent, NaCl, Na in the main immersion waste liquid
2CO
3, grease-removing agent, grease and degradation production thereof, hair, keratin protein, Saliva Orthana, meat, blood etc., wherein, generally speaking, residual grease-removing agent content is generally the 15-30% of initial content in the waste liquid, residual immersion agent content is generally the 15-25% of initial content in the waste liquid, residual Na in the waste liquid
2CO
3Content is generally the 30-50% of initial content; Contain grease and degradation production thereof, salt, lime, auxiliary liming agent, S in the liming waste liquid
2-, OH
-, Na
+, Ca
++, protein and degradation production, enzyme and amine substance etc., wherein, generally speaking, residual lime is generally the 37-55% of initial content in the waste liquid, residual Na in the waste liquid
2S content is generally 2.4-3.2g/l; Contain protein and degradation production thereof, deliming agent, grease-removing agent, grease and degradation production thereof, enzyme and ammonium salt, amine substance etc. in the deashing and softening waste liquid, wherein residual enzyme content is generally the 30-50% of initial content in the waste liquid, and residual amounts of ammonium salt is generally the 30-40% of initial content in the waste liquid; Contain Cr in the chroming waste liquor
3+, Cl
-, SO
4 2-, acid group, protein and degradation production, grease and degradation production thereof etc., wherein residual Cr in the waste liquid
3+Be generally 2.8-3.2g/l, Cl
-Be generally 7-15g/l, residual acid group content is generally the 30-45% of initial content in the waste liquid.
Preferably, main soaking process and liming operation can adopt same rotary drum, at other main immersion waste liquid liquid storage tank and the liming waste liquid liquid storage tank of being provided with respectively of rotary drum, control the discharging of waste liquid of rotary drum to each liquid storage tank in the mode of valve.Specifically, when main immersion and liming with a rotary drum time, valve 1 is set on rotary drum, be used for master immersion discharging of waste liquid simultaneously, valve 2 being set on rotary drum to master's waste liquid liquid storage tank that soaks, be used for the liming discharging of waste liquid is arrived liming waste liquid liquid storage tank.During the main immersion of discharging waste liquid, valve 1 is opened, and valve 2 is closed, and waste liquid is discharged into main immersion waste liquid liquid storage tank through shunt conduit; During discharging liming waste liquid, valve 1 is closed, and valve 2 is opened, and waste liquid is discharged into liming waste liquid liquid storage tank through shunt conduit.
Similarly, deashing and softening operation and chrome tanning process also can adopt same rotary drum, on the rotary drum side deashing and softening waste liquid liquid storage tank and chroming waste liquor liquid storage tank are set respectively, control the discharging of waste liquid of rotary drum to each liquid storage tank in the mode of valve.Specifically, when deashing and softening and chrome tanning with a rotary drum time, valve 3 is set on rotary drum, be used for the deashing and softening discharging of waste liquid to deashing and softening waste liquid liquid storage tank, simultaneously, valve 4 is set on rotary drum, is used for chroming waste liquor is discharged into the chroming waste liquor liquid storage tank.During discharging deashing and softening waste liquid, valve 3 is opened, and valve 4 is closed, and waste liquid is discharged into deashing and softening waste liquid liquid storage tank through shunt conduit; During the discharging chroming waste liquor, valve 3 is closed, and valve 4 is opened, and waste liquid is discharged into the chroming waste liquor liquid storage tank through shunt conduit.
In waste liquid cycling and reutilization process of the present invention, for liming, deashing and softening, these totally-enclosed waste liquid round-robin operations of chrome tanning, can regularly clean processing according to the sliminess of waste liquid in each waste liquid liquid storage tank to waste liquid, remove solids wherein, liquid continues cycling and reutilization.For example, with the mode of press filtration waste liquid is cleaned processing, be used to fill out hole or brickmaking or other purposes through the isolated solids of press filtration, isolated wastewater collection is gone into each waste liquid liquid storage tank in order to cycling and reutilization.
Waste liquid is cleaned the processing cycle can be adjusted according to concrete production status, excessive when the sliminess of waste liquid, for example, make the efficient of pumping of waste liquid reduce, limit the dissolving dispersion of skin material etc., so that when being unfavorable for that leather is produced, can clean processing.Clean the processing cycle for concrete waste liquid, those skilled in the art can rule of thumb suitably adjust.Generally speaking, for the medium-sized tannery that adopts traditional technology, liming waste liquid liquid storage tank can be every cleaning in 20-40 days once, and deashing and softening waste liquid liquid storage tank can be every cleaning in 30-50 days once, and the chroming waste liquor liquid storage tank can be every cleaning in 40-60 days once.
Used among the present invention " must remove from office treasured " is Bao Sika company product, is senior alcohol ether and salts substances, is extensive use of in the art, can or directly obtain from Bao Sika (Shangqiu) chemical industry company limited by Chemical market.
The present invention has following beneficial effect:
The present invention has realized in the process hides waste water cycling and reutilization of each workshop section from the raw hide to the wet blue substantially, and except that the immersion waste liquid is half recycle, the waste liquid of other operation has been realized whole recycles, and can unlimitedly circulate, sewage effluent particularly utilizes useless chrome liquor hardly, and the moisturizing in later stage heats up and lacks about 7-10 ℃ than common process, obtained the blue skin of high-quality, for traditional technology, can save followingization material: grease-removing agent 15-30%, immersion agent 15-25%, soda ash 30-50%, Na
2S35-50%, NaHS 30-45%, lime 37-55%, liming enzyme 20-30%, auxiliary liming agent 10-20%, ammonium sulfate 30-40%, deliming agent 15-20%, macerating enzyme 30-50%, formic acid 30-45%, sulfuric acid 30-50%, salt 70-100%, chromium powder 35-55%.Certainly concrete technology difference, the amount of economized material are also slightly different, but in general, can realize economized material 15-55%, reduce sewage discharge 70%-85%, and the wet blue yield of leather increases 1-3.5%; The high 3-12 of shrinkage temperature ℃, obtained the high-quality wet blue.The finished product of Sheng Chaning is removed from office every performance index and is all reached requirement thus, and effectively reduces finished leather loose side rate, has improved the degree of packing of finished leather.
Description of drawings
Fig. 1 is the schematic flow sheet according to waste leather-making liquid step by step cycling and reutilization technology of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples:
Embodiment 1
As shown in the figure, in soaking process, after raw hide is led immersion, be discharged into main immersion waste liquid liquid storage tank behind the waste liquid elimination solid substance, stir with agitator, extract out by lye pump then and be drained into pre-soaking drum, the technology of utilizing main immersion waste liquid to soak in advance is: in raw hide weight, liquor ratio is 2, adds 0.2% sterilant, rotary drum rotated 15 minutes, add 0.35% immersion auxiliary agent, 0.2% grease-removing agent then, rotary drum rotated 20 minutes, stopped 40 minutes, commentaries on classics stops combination and carries out 4 times, and the discharge of wastewater after pre-immersion finishes falls.In the liming operation, enter liming waste liquid liquid storage tank behind the liming waste liquid elimination solid substance, stir, extract out by lye pump then and be drained into the liming rotary drum, utilize the liming waste liquid to carry out liming technology to be: in raw hide weight, add 70% liming waste liquid, 0.2% grease-removing agent, 0.1% Sodium sulfhydrate, rotary drum rotated 30 minutes, stopped 5 minutes, and changeed and stop in conjunction with carrying out 4 times; Add 70% liming waste liquid, 0.7% lime, 0.3% sodium sulphite, 0.2% Sodium sulfhydrate, 1.0% again and must remove from office treasured, rotary drum rotated 40 minutes, stopped 20 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 50% liming waste liquid, 0.3% sodium sulphite, 0.3% sodium hydroxide, 0.15% liming enzyme, 0.6% again and must remove from office treasured, rotary drum rotated 60 minutes, stopped 30 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 20% clear water, 1.5% lime, change and stopped each 30 minutes, revolution stopped 25 minutes in 5 minutes then, carried out 2 times, and revolution stopped 90 minutes in moving 5 minutes then, spent the night; Graywall is carried out the fleshing split, carry out taking off of deliming then.In the deashing and softening operation, enter deashing and softening waste liquid liquid storage tank behind the deashing and softening waste liquid elimination solid substance, extract out by lye pump then and be drained into the deashing and softening rotary drum, the technology of utilizing waste liquid to carry out deashing and softening is: liquor ratio is 1, add 0.2% grease-removing agent, 0.6% deliming agent, 1.2% ammonium sulfate, 0.4% hydrochloric acid, rotary drum rotated 40 minutes, added 0.25% macerating enzyme, rotated 30 minutes.In chrome tanning process, be drained into liquid storage tank behind the useless chrome liquor elimination solid substance, transferring its pH value with sulfuric acid is 1-1.2, stir, extract out by acid proof pump then and flow into the chrome tanning rotary drum, the technology of utilizing chroming waste liquor to carry out chrome tanning is: 70% useless chrome liquor, 0.25% mould inhibitor, 3% salt, rotary drum rotated 10 minutes, 0.6% formic acid (diluting about its concentration to 5% with useless chrome liquor), rotated 20 minutes, 0.6% sulfuric acid (diluting about its concentration to 5% with useless chrome liquor) is divided three addings equally, and added once in 10 minutes at every interval, rotated 90 minutes, 0.5% cationic fat liquor rotated 30 minutes, stopped 1-2 hour; 2.5% chromium powder rotated 30 minutes, and 3% chromium powder rotated 1 hour, and 0.5% sodium formiate changeed 30 minutes, and 0.4% carries alkaline agent, rotated 4 hours, after be warming up to 35 ℃, add 50% useless chrome liquor, rotated 3 hours.
The shrinkage temperature that records wet blue is 105 ℃, and the wet blue color is blue, and grain is careful.
The circulation waste liquid of above-mentioned liming, deashing and softening, chrome tanning process regularly carries out press filtration according to circumstances to be handled, and the waste liquid that press filtration obtains is recovered into corresponding waste liquid pool and continues cycling and reutilization, and the useless solid thing that press filtration obtains is used to fill out cheats or other.
Under the situation that does not break away from spirit of the present invention or substantive features, can implement the present invention with other form, with reference to claim but not above-mentioned specification sheets, as indication scope of the present invention.
Claims (9)
1. waste leather-making liquid step by step cycling and reutilization technology, it is characterized in that proceed step by step waste liquid cycling and reutilization in main immersion, liming, deashing and softening, chrome tanning process, wherein the circulation of soaking process waste liquid is half circulation, the circulation of liming, deashing and softening, chrome tanning process waste liquid is totally-enclosed circulation, and described technology comprises the steps:
(1) the waste liquid cycling and reutilization of main soaking process: at the other master's immersion waste liquid liquid storage tank that is provided with of main soaking drum, enter main immersion waste liquid liquid storage tank in the waste liquid elimination waste liquid of next autonomous soaking process behind the solid substance, stir, to be ready for use on down the pre-immersion of batch raw hide; The technology of utilizing main immersion waste liquid to soak in advance is: in raw hide weight, be that 1.8-2.2 adds and becomes owner of the immersion waste liquid with the liquor ratio, add the 0.2-0.4% sterilant, rotary drum rotated 15 minutes, add 0.3-0.5% immersion auxiliary agent, 0.2-0.5% grease-removing agent then, rotary drum rotated 20 minutes, stopped 40 minutes, commentaries on classics stops combination and carries out 4 times, and the discharge of wastewater after pre-immersion finishes falls;
The waste liquid cycling and reutilization of (2) liming operation: on liming rotary drum side liming waste liquid liquid storage tank is set,, stirs, to be ready for use on down the liming of batch skin from entering liming waste liquid liquid storage tank behind the solid substance in the liming waste liquid elimination waste liquid of liming operation; The technology of utilizing the liming waste liquid to carry out liming is: in raw hide weight, add 30-90% liming waste liquid, 0.15-0.3% grease-removing agent, 0.1-0.2% Sodium sulfhydrate, rotary drum rotated 30 minutes, stopped 5 minutes, changeed and stopped in conjunction with carrying out 4 times; Add 30-90% liming waste liquid, 0.7-0.8% lime, 0.3-0.4% sodium sulphite, 0.2-0.5% Sodium sulfhydrate, 1.2-1.5% again and must remove from office treasured, rotary drum rotated 40 minutes, stopped 20 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 20-60% liming waste liquid, 0.2-0.5% sodium sulphite, 0.1-0.3% sodium hydroxide, 0.1-0.15% liming enzyme, 0.6-0.8% again and must remove from office treasured, rotary drum rotated 60 minutes, stopped 30 minutes, changeed and stopped in conjunction with carrying out 2 times; Add 10-20% clear water, 1-2.0% lime, change and stopped each 30 minutes, revolution stopped 25 minutes in 5 minutes then, carried out 2 times, and revolution stopped 90 minutes in moving 5 minutes then, spent the night;
(3) the waste liquid cycling and reutilization of deashing and softening operation: at the other deashing and softening waste liquid liquid storage tank that is provided with of deashing and softening rotary drum, from entering deashing and softening waste liquid liquid storage tank behind the solid substance in the waste liquid elimination waste liquid of deashing and softening operation, stir, to be ready for use on down the deashing and softening of batch skin; The technology of utilizing the deashing and softening waste liquid to carry out deashing and softening is: in graywall weight, liquor ratio is 1-1.5, add 0.1-0.3% grease-removing agent, 0.4-0.8% deliming agent, 0.8-1.2% ammonium sulfate, 0.1-0.4% hydrochloric acid, rotary drum rotated 30-50 minute, add the 0.15-0.3% macerating enzyme, rotated 25-40 minute;
(4) the waste liquid cycling and reutilization of chrome tanning process: on chrome tanning rotary drum side the chroming waste liquor liquid storage tank is set, this pond should be deep to underground 3-6 rice in order to temperature control, and standby pool is preferably arranged.From entering the chroming waste liquor liquid storage tank behind the solid substance in the waste liquid elimination waste liquid of chrome tanning process, after cooling, to 0.7-1.4, stir with sour pH value of regulating chroming waste liquor, to be ready for use on down the chrome tanning of batch skin, use the best back overnight of chroming waste liquor; The technology of utilizing chroming waste liquor to carry out chrome tanning is: in graywall weight, add 20-100% chroming waste liquor, 0.2-0.3% mould inhibitor, the 0-3% Industrial Salt, rotary drum rotated 10 minutes, 0.3-0.5% formic acid rotated 0.3-0.5% sulfuric acid 20 minutes, divide two to three addings equally, each 10 minutes at interval, rotary drum rotated 70-100 minute, added the 0.4-0.6% cationic fat liquor, rotated 30 minutes, stopped 1-2 hour; Add the 1-2% chromium powder, rotary drum rotated 30 minutes, added the 1.5-3.5% chromium powder again, rotated 1 hour, add the 0.3-0.7% sodium formiate, changeed 30 minutes, add 0.3-0.5% and carry alkaline agent, rotated 3.5-4.5 hour, after be warming up to 28-32 ℃, add the 20-80% chroming waste liquor, rotated 3-5 hour.
2. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1 is characterized in that each liquid storage tank all is equipped with whipping appts.
3. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1, the graywall after liming carries out fleshing and split, and the waste collection that produces in fleshing and the split process is gone into liming waste liquid liquid storage tank in order to cycling and reutilization.
4. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1, it is characterized in that main soaking process and liming operation adopt same rotary drum, at other main immersion waste liquid liquid storage tank and the liming waste liquid liquid storage tank of being provided with respectively of rotary drum, control the discharging of waste liquid of rotary drum to each liquid storage tank in the mode of valve.
5. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1, it is characterized in that deashing and softening operation and chrome tanning process adopt same rotary drum, on the rotary drum side deashing and softening waste liquid liquid storage tank and chroming waste liquor liquid storage tank are set respectively, control the discharging of waste liquid of rotary drum to each liquid storage tank in the mode of valve.
6. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1 is characterized in that regularly waste liquid being cleaned processing according to the sliminess of waste liquid in each waste liquid liquid storage tank, removes solids wherein, and liquid continues cycling and reutilization.
7. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 6, it is characterized in that waste liquid being cleaned processing with the mode of press filtration, be used to fill out hole or brickmaking or other purposes through the isolated solids of press filtration, isolated wastewater collection is gone into each waste liquid liquid storage tank in order to cycling and reutilization.
8. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1 is characterized in that the skin after deashing and softening operation and chrome tanning process processing is removed conventional water-washing step from.
9. waste leather-making liquid step by step cycling and reutilization technology as claimed in claim 1 is characterized in that at the other standby pool that is provided with again of chroming waste liquor liquid storage tank.
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Cited By (8)
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| CN102535197A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process indefinitely recycling waste liquid to perform dyeing |
| CN104005241A (en) * | 2014-06-06 | 2014-08-27 | 张壮斗 | Tanning technique for filtering dyeing circulation wastewater at regular time |
| WO2014169564A1 (en) * | 2013-04-18 | 2014-10-23 | Zhang Zhuangdou | Tannery waste liquid step-by-step recycling process having improved effect |
| WO2015081624A1 (en) * | 2013-12-04 | 2015-06-11 | 张壮斗 | Tanning process |
| WO2015120661A1 (en) * | 2014-02-15 | 2015-08-20 | 张壮斗 | Circulation engineering for achieving near-zero discharge of tanning waste water |
| CN106755625A (en) * | 2015-11-25 | 2017-05-31 | 张壮斗 | The technology of skin is done using waste liquid |
| US10260115B2 (en) | 2014-03-20 | 2019-04-16 | Zhuangdou Zhang | Leather production using waste liquids |
| US10501336B2 (en) | 2013-12-04 | 2019-12-10 | Zhuangdou Zhang | Tannery process with effluent recycling |
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Cited By (9)
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| CN102535197A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process indefinitely recycling waste liquid to perform dyeing |
| WO2014169564A1 (en) * | 2013-04-18 | 2014-10-23 | Zhang Zhuangdou | Tannery waste liquid step-by-step recycling process having improved effect |
| WO2015081624A1 (en) * | 2013-12-04 | 2015-06-11 | 张壮斗 | Tanning process |
| US10501336B2 (en) | 2013-12-04 | 2019-12-10 | Zhuangdou Zhang | Tannery process with effluent recycling |
| US11040890B2 (en) | 2013-12-04 | 2021-06-22 | Zhuangdou Zhang | Tannery process with effluent recycling |
| WO2015120661A1 (en) * | 2014-02-15 | 2015-08-20 | 张壮斗 | Circulation engineering for achieving near-zero discharge of tanning waste water |
| US10260115B2 (en) | 2014-03-20 | 2019-04-16 | Zhuangdou Zhang | Leather production using waste liquids |
| CN104005241A (en) * | 2014-06-06 | 2014-08-27 | 张壮斗 | Tanning technique for filtering dyeing circulation wastewater at regular time |
| CN106755625A (en) * | 2015-11-25 | 2017-05-31 | 张壮斗 | The technology of skin is done using waste liquid |
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