CN104310733A - Method and device for recycling chromium-containing sludge - Google Patents
Method and device for recycling chromium-containing sludge Download PDFInfo
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- CN104310733A CN104310733A CN201410619850.XA CN201410619850A CN104310733A CN 104310733 A CN104310733 A CN 104310733A CN 201410619850 A CN201410619850 A CN 201410619850A CN 104310733 A CN104310733 A CN 104310733A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method and a device for recycling chromium-containing sludge, and belongs to the technical field of fur manufacturing. The method comprises the following steps: (1) collecting the chromium-containing sludge, and measuring the content of chromium sesquioxide contained in the chromium-containing sludge; (2) taking and diluting 65-70% of concentrated sulfuric acid according to the weight of the contained chromium sesquioxide, adding diluted concentrated sulfuric acid to the chromium-containing sludge, carrying out a full reaction at 90-95 DEG C, and then carrying out solid-liquid separation to obtain first supernate; (3) allowing the first supernate to stand, and cooling to a normal temperature for filter pressing so as to obtain second supernate; (4) using the second supernate in a tanning or retanning operation. According to the method, the second supernate is obtained without the operations of calcining, reduction and the like, and the operation of tanning is directly recycled, so that the recovery process is simplified, and the recovery cost is reduced; the method can be implemented without particularly complicated equipment. The recycling operation can be realized by ordinary fur manufacturing enterprises, and the method has extremely good practical applicability.
Description
Technical field
The present invention relates to fur manufacturing technical field, in particular to a kind of recoverying and utilizing method and device thereof of chromium-bearing sludge.
Background technology
Basic chromium sulfate is also known as basic chromic sulfate, and commodity are called basic chrome sulfate, also claims chromium powder.Be widely used in printing and dyeing, pottery, green ink, process hides, fur industries etc.In process hides, fur industries, basic chromium sulfate is a kind of extremely important metal tanning agents.
Started to be applied to leather tanning from 1893, so far existing century-old history.A lot of research and application shows, it is the tanning agent that in various inorganic tanning agent, best performance is good, uses its Tanned skin, finished product water tolerance, shelf-stable are fabulous, and dermatotome is plentiful, soft, flexible, have best hydrothermal stability, thus, it is the most widely used tanning agent of leather and fur.So far desirable alternative tanning agent is not yet found.
China is the poor country of chromium resource, and chrome ore mainly relies on import, and chromium is applied widely in the industrial production; Therefore, utilize limited chromium resource rationally and effectively, current be a focal issue extremely paid close attention to.
In addition, although chromium element itself is the necessary trace element of human body, a large amount of chromium is but harmful to people and animals and plants, and in China's regulation Drinking Water, chromic concentration should lower than 0.05 mg/litre; In the surface water, the maximum allowable concentration of chromium is 0.5 mg/litre (trivalent chromium) and 0.05 mg/litre (sexavalent chrome); In trade effluent, the highest permissible discharge standard of sexavalence chromium and compound is 0.5 mg/litre (by sexavalent chrome).And contain the important sources that chromium solid waste (being mainly from the post-depositional clod of the chrome waste liquid of chemical plant emission) is pollution of chromium.Deficient and the present situation that demand is larger and the harm problem that chromium solid waste is brought environment and human body in view of China chromium resource; Chromium-bearing sludge is processed once again and realize chromium resource utilize once again day by day become this field people pay close attention to focus.
In the related, the common fado that does is after being separated by the chromium in chromium-bearing sludge, and by calcining containing chromium crude product of obtaining, removing is containing some impurity be separated difficult in chromium crude product; Obtain sexavalent chrome simultaneously; Utilize corresponding reductive agent to reduce the sexavalent chrome of gained again, finally obtaining can directly as the trivalent chromium of tanning agent.
Although this kind of operating method also achieves the separation once again containing chromium in chromium pollutant; But what its needs were extra sets up the sequence of operations such as calcining, reduction and corresponding equipment.And to equipment and operational requirement all higher, common fur manufacturing enterprise cannot realize, and need be completed by the chemical enterprise of specialty, and then directly increases the input of human and material resources of whole removal process; Its cost recovery is high, complex operation, required cycle are longer; Simple fur manufacturing enterprise cannot realize at all, and practical application is not strong.
In view of this, special proposition the present invention.
Summary of the invention
The first object of the present invention is the recoverying and utilizing method providing a kind of chromium-bearing sludge, the recoverying and utilizing method chromium achieved in chromium-bearing sludge of described chromium-bearing sludge returns in tanning or retanning, has simple to operate, the advantage such as cost recovery is cheap, the cycle is short and practical application is strong.
The second object of the present invention is to provide a kind of device realizing the recoverying and utilizing method of described chromium mud, this device have arrange easy, controllability is strong, the advantage such as with low cost.
In order to realize above-mentioned purpose of the present invention, spy by the following technical solutions:
A recoverying and utilizing method for chromium-bearing sludge, comprises the following steps:
1), collect chromium-bearing sludge, and measure the content of the chromium sesquioxide contained by it;
2), according to the 65%-70% of contained chromium sesquioxide weight get the vitriol oil and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 90 DEG C-95 DEG C fully reaction, carrying out solid-liquid separation, obtain the first supernatant liquor;
3), by described first supernatant liquor leave standstill, and carry out press filtration after being cooled to normal temperature, obtain the second supernatant liquor;
4), described second supernatant liquor is used in tanning or retanning operation.
The recoverying and utilizing method of this chromium-bearing sludge provided by the invention, it is by measuring chromic oxide content contained in chromium-bearing sludge, and then the weight of the vitriol oil added required for determining; Chromium (existing mainly with chromic form) in chromium-bearing sludge, its meeting and sulfuric acid generation neutralization reaction, generate basic chromium sulfate; Weight is that the vitriol oil of chromic oxide content 65%-70% in chromium-bearing sludge can ensure that the chromium in mud can react completely at 90 DEG C-95 DEG C fully; Carry out solid-liquid separation after reaction, the first supernatant liquor (main component is basic chromium sulfate) can be obtained; Left standstill, be cooled to normal temperature; This process, also referred to as the process of ageing, can further be reacted, and impurity suspended substance precipitates completely, and arranges regularly, is highly susceptible to solid-liquid separation again.After first supernatant liquor ageing, its (liquid portion) is carried out press filtration; And then achieving further purification operations, the second supernatant liquor obtained can be directly inputted to the operation carrying out tanning or retanning in rotary drum.
The method is easy and simple to handle, is recycled product (the second supernatant liquor) and, without the need to operations such as calcining, reduction, is recycled directly in the operation of tanning, simplifies recovery process and save cost recovery; Whole recovery process can be realized without the need to equipment complicated especially; Common fur manufacturing enterprise can realize reclaimer operation voluntarily, therefore, has extraordinary practical application.
Optionally, in step 1) in:
Described collection chromium-bearing sludge specifically comprises: carry out taxonomic revision to chromium-bearing sludge, obtains chromium-bearing sludge containing dyestuff and not containing the chromium-bearing sludge of dyestuff;
By described chromium-bearing sludge containing dyestuff and describedly carry out step 2 respectively containing the chromium-bearing sludge of dyestuff) and step 3);
In step 4) in, specifically comprise:
Second supernatant liquor of the chromium-bearing sludge derived from containing dyestuff is used for change colour in the tanning of hide or retanning operation, in the tanning the second supernatant liquor of the chromium-bearing sludge derived from not containing dyestuff being used for all hides or retanning operation.
Be applied to the classification process of dissimilar chromium-bearing sludge and by the second supernatant liquor obtained after process in the different tannery required; As, in the tanning of the hide that may be used on containing the second supernatant liquor of obtaining after the chromium-bearing sludge process of dyestuff changing colour or retanning operation; And in the tanning that not may be used on all hides containing the second supernatant liquor of obtaining after the chromium-bearing sludge process of dyestuff or retanning operation; And then achieve reasonable disposition and the utilization of resource.
Optionally, in step 1) and step 2) between, also comprise:
Pulverize after described chromium-bearing sludge is dried to mud cake shape, obtain Powdered chromium-bearing sludge.
Chromium-bearing sludge is dried to mud cake shape and pulverizes, and fully can mix in the process of reaction with the vitriol oil, improves the efficiency of reaction further.
Optionally, in step 2) in, described dilution is: the water dilution by concentration being the vitriol oil 3-4 times volume of 98%.
Join in chromium-bearing sludge after the water of diluting concentrated sulfuric acid 3-4 times volume is diluted and react, reduce the concentration of the vitriol oil, prevent careless manipulation and then unexpected injury is caused to operator, improve the security of operation.
Optionally, in step 2) in:
The time of described reaction is 3-6 hour.
The reaction times of 3-6 hour fully can ensure that the chromium in chromium-bearing sludge can be complete with strong sulfuric acid response, makes the chromium in mud change basic chromium sulfate into as far as possible completely, ensure that organic efficiency.
Optionally, in step 2) in:
In the process of described reaction, the vitriol oil after chromium-bearing sludge and dilution is stirred.
In reaction process, carry out stirring can make reactant fully contact, and then adds the speed of fast response, and in the process stirred, can play the effect of heat radiation to whole reaction system, has further ensured the security of operation.
Realize a device for the recoverying and utilizing method of described chromium-bearing sludge, comprising:
Electrically heated retort: for containing chromium-bearing sludge and the vitriol oil, and chromium-bearing sludge and the vitriol oil are heated and stirs;
First device for storing liquid: for collection, ageing from isolated first supernatant liquor of electrically heated retort;
Filter-pressing device: for the first supernatant liquor after ageing is carried out press filtration, and obtain the second supernatant liquor;
Second device for storing liquid: for storing the second supernatant liquor.
Optionally, described electrically heated retort, the first device for storing liquid, filter-pressing device, the second device for storing liquid connect successively.
Optionally, described filter-pressing device is plate type pressure filter.
Also comprise drawing liquid equipment;
Described drawing liquid equipment is used for described second supernatant liquor to be input in tanning or retanning equipment.
Compared with prior art, beneficial effect of the present invention is:
(1), by the recovery Posterior circle of chromium in chromium-bearing sludge in hair leather process operation, on the one hand by having lacked its pollution to environment, chromium resource has been saved on the other hand.
(2), the method is easy and simple to handle, obtain the second supernatant liquor without the need to carrying out calcining, the operation such as reduction, can be recycled directly in the operation of tanning, simplify recovery process and save cost recovery.
(3), owing to determining the content of the chromium sesquioxide in chromium-bearing sludge in advance, and be specifically provided with the amount of the added vitriol oil, only need within 3-6 hour, get final product sufficient reacting, the cycle of reclaimer operation is shortened greatly.
(4), whole recovery process can be realized without the need to equipment complicated especially; Common fur manufacturing enterprise can realize reclaimer operation voluntarily, has extraordinary practical application.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
The operational flowchart of the recoverying and utilizing method of the chromium-bearing sludge that Fig. 1 provides for the embodiment of the present invention 1.
Embodiment
Below in conjunction with embodiment, embodiment of the present invention are described in detail, but it will be understood to those of skill in the art that the following example only for illustration of the present invention, and should not be considered as limiting the scope of the invention.Unreceipted actual conditions person in embodiment, the condition of conveniently conditioned disjunction manufacturers suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, be and can buy by commercially available the conventional products obtained.
The invention provides a kind of recoverying and utilizing method of chromium-bearing sludge, comprise the following steps:
1), collect chromium-bearing sludge, and measure the content of the chromium sesquioxide contained by it; 2), according to the 65%-70% of contained chromium sesquioxide weight get the vitriol oil and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 90 DEG C-95 DEG C fully reaction, carrying out solid-liquid separation, obtain the first supernatant liquor; 3), by the first supernatant liquor leave standstill, and carry out press filtration after being cooled to normal temperature, obtain the second supernatant liquor; 4), the second supernatant liquor is used in tanning or retanning operation.
In addition, in order to realize the classification process of dissimilar chromium-bearing sludge and the second supernatant liquor of obtaining after process is applied in the different tannery required, as in the tanning of the hide that may be used on containing the second supernatant liquor obtained after the chromium-bearing sludge process of dyestuff changing colour or retanning operation; And in the tanning that not may be used on all hides containing the second supernatant liquor of obtaining after the chromium-bearing sludge process of dyestuff or retanning operation; And then realize reasonable disposition and the utilization of resource; Preferably, also proceed as follows in conjunction with on the basis of foregoing: in step 1) in:
Collect chromium-bearing sludge specifically to comprise: carry out taxonomic revision to chromium-bearing sludge, obtain chromium-bearing sludge containing dyestuff and do not contain the chromium-bearing sludge of dyestuff;
By the chromium-bearing sludge containing dyestuff and carry out step 2 respectively containing the chromium-bearing sludge of dyestuff) and step 3);
In step 4) in, specifically comprise:
Second supernatant liquor of the chromium-bearing sludge derived from containing dyestuff is used for change colour in the tanning of hide or retanning operation, in the tanning the second supernatant liquor of the chromium-bearing sludge derived from not containing dyestuff being used for all hides or retanning operation.
Fully can mix with the vitriol oil in the process of reaction to realize chromium-bearing sludge, improving the efficiency of reaction further; Preferably, in step 1) and step 2) between, increase after chromium-bearing sludge is dried to mud cake shape and pulverize, obtain the operation of Powdered chromium-bearing sludge.
In addition, because the vitriol oil is a kind of hazardous chemicals; Therefore, when being joined in chromium-bearing sludge, in order to improve the security of operation, preferably, by concentration be 98% vitriol oil 3-4 times volume water dilution.
Further, in step 2) in, in order to make sufficient reacting, ensure that the chromium in mud can be converted to basic chromium sulfate as much as possible; Preferably, the time controling of reaction is at 3-6 hour; And preferred, in the process of reaction, the vitriol oil after chromium-bearing sludge and dilution is stirred; The operation of stirring on the one hand can fast reaction speed, can reduce the heat produced in whole reaction process on the other hand, thus the security of the operation improved.
The recoverying and utilizing method of this chromium-bearing sludge provided by the invention, it is by measuring chromic oxide content contained in chromium-bearing sludge, and then the weight of the vitriol oil added required for determining; Chromium (existing mainly with chromic form) in chromium-bearing sludge, its meeting and vitriol oil generation neutralization reaction, generate basic chromium sulfate; Weight is that the vitriol oil of chromic oxide content 65%-70% in chromium-bearing sludge can ensure that the chromium in mud can react completely at 90 DEG C-95 DEG C fully; Carry out solid-liquid separation after reaction, the first supernatant liquor (main component is basic chromium sulfate) can be obtained; Left standstill, be cooled to normal temperature; This process, also referred to as the process of ageing, can further be reacted, and impurity suspended substance precipitates completely, and arranges regularly, is highly susceptible to solid-liquid separation again.After first supernatant liquor ageing, its (liquid portion) is carried out press filtration; And then achieve further purification operations; The second supernatant liquor obtained can be directly inputted to the operation carrying out tanning or retanning in rotary drum.
The method is easy and simple to handle, obtain the second supernatant liquor without the need to carrying out calcining, the operation such as reduction, be recycled directly in the operation of tanning, simplify recovery process and save cost recovery; Whole recovery process can be realized without the need to equipment complicated especially; Common fur manufacturing enterprise can realize reclaimer operation voluntarily, therefore, has extraordinary practical application.
Next, in conjunction with above content, specific embodiment is enumerated to the recoverying and utilizing method of chromium-bearing sludge of the present invention and device:
Embodiment 1
Please refer to Fig. 1, the recoverying and utilizing method of the chromium-bearing sludge that the embodiment of the present invention provides comprises the following steps:
Step 101: collect chromium-bearing sludge, and measure the content of the chromium sesquioxide contained by it;
Step 102: get the vitriol oil according to 65% of contained chromium sesquioxide weight and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 90 DEG C fully reaction, carry out solid-liquid separation, obtain the first supernatant liquor;
Step 103: described first supernatant liquor is left standstill, and carries out press filtration after being cooled to normal temperature, obtain the second supernatant liquor;
Step 104: described second supernatant liquor is used in tanning or retanning operation.
Embodiment 2
The recoverying and utilizing method of the chromium-bearing sludge that the embodiment of the present invention provides comprises the following steps:
S21: carry out taxonomic revision to chromium-bearing sludge, obtains chromium-bearing sludge containing dyestuff and not containing the chromium-bearing sludge of dyestuff, and measures the content of the chromium sesquioxide contained by it respectively;
S22: pulverize after chromium-bearing sludge being dried to mud cake shape, obtains Powdered chromium-bearing sludge;
Pulverize after the chromium-bearing sludge containing dyestuff that classification in above-mentioned steps S21 is obtained and the chromium-bearing sludge not contained to dyestuff are dried to mud cake shape respectively, obtain the Powdered chromium-bearing sludge of two types, and carry out following process respectively.
S23: get the vitriol oil according to 67% of contained chromium sesquioxide weight and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 93 DEG C fully reaction, carry out solid-liquid separation, obtain the first supernatant liquor;
In this step, chromium-bearing sludge is specially the Powdered chromium-bearing sludge of two types; In addition, adding the security in vitriol oil process to ensure, preferably, again it slowly being joined in pulverous chromium-bearing sludge after the water diluting concentrated sulfuric acid of 3-4 times of volume need be utilized.And in the process of reaction, constantly raw mixture is stirred; To realize the effect of fast reaction speed and heat radiation, and the time of reaction is set as 5 hours; Like this, sufficient reacting can be ensured, to improving the rate of recovery of chromium.
S24: the first supernatant liquor is left standstill, and carry out press filtration after being cooled to normal temperature, obtain the second supernatant liquor;
After abundant reaction, the chromium in chromium-bearing sludge can change basic chromium sulfate (being commonly called as chrome liquor) into; Carried out leaving standstill cooling, this process is also the process of ageing, react further, and impurity suspended substance precipitates completely and arranges regularly, be highly susceptible to solid-liquid separation again in solid-liquid system.After ageing, carry out press filtration to the first supernatant liquor (liquid portion), and then realize the purification again of supernatant liquor, the slag body after press filtration is collected separately, and again processes rear re-using or discharge.The liquid obtained after press filtration is then the second supernatant liquor.
S25: the second supernatant liquor is used in tanning or retanning operation.
Concrete, second supernatant liquor of the chromium-bearing sludge derived from containing dyestuff is used for change colour in the tanning of hide or retanning operation, in the tanning the second supernatant liquor of chromium-bearing sludge derived from not containing dyestuff being used for all hides or retanning operation, and then achieve the effect of the second supernatant liquor flexible utilization of different sources, it is pointed out that and in the second supernatant liquor, can again carry out conventional tanning operations after extra supplementary chrome tanning agent according to the demand of reality.
Embodiment 3
The recoverying and utilizing method of the chromium-bearing sludge that the embodiment of the present invention provides comprises the following steps:
S31: carry out taxonomic revision to chromium-bearing sludge, obtains chromium-bearing sludge containing dyestuff and not containing the chromium-bearing sludge of dyestuff, and measures the content of the chromium sesquioxide contained by it respectively;
S32: pulverize after chromium-bearing sludge being dried to mud cake shape, obtains Powdered chromium-bearing sludge;
Pulverize after the chromium-bearing sludge containing dyestuff that classification in above-mentioned steps S31 is obtained and the chromium-bearing sludge not contained to dyestuff are dried to mud cake shape respectively, obtain the Powdered chromium-bearing sludge of two types, and carry out following process respectively.
S33: get the vitriol oil according to 70% of contained chromium sesquioxide weight and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 95 DEG C fully reaction, carry out solid-liquid separation, obtain the first supernatant liquor;
Chromium-bearing sludge is specially the Powdered chromium-bearing sludge of two types; Adding the security in vitriol oil process to ensure, preferably, again it slowly being joined in pulverous chromium-bearing sludge after the water diluting concentrated sulfuric acid of 4 times of volumes need be utilized.
And in the process of reaction, constantly raw mixture is stirred; To realize the effect of fast reaction speed and heat radiation, and the time of reaction is set as 6 hours.
In addition, in this step, the chromic oxide content in Real-Time Monitoring first supernatant liquor is needed, when its extraction yield ratio of total amount in chromium-bearing sludge (content of chromium sesquioxide in the first supernatant liquor with) is greater than after 90% and carries out follow-up operation again; As extraction yield is less than 90%, then need to continue insulation, stirring reaction, until its extraction yield is greater than 90%.
S34: the first supernatant liquor is left standstill, and carry out press filtration after being cooled to normal temperature, obtain the second supernatant liquor;
S35: the second supernatant liquor is used in tanning or retanning operation.
Above-mentioned steps S34, S35 are consistent with S24, S25 in embodiment 2 respectively, do not repeat at this.
Embodiment 4
Embodiments provide a kind of device realizing the recoverying and utilizing method of the chromium-bearing sludge of above-described embodiment, comprising:
Electrically heated retort, the first device for storing liquid, filter-pressing device, the second device for storing liquid and drawing liquid equipment; Wherein, electrically heated retort, the first device for storing liquid, filter-pressing device, the second device for storing liquid connect successively.
Concrete, electrically heated retort is used for containing chromium-bearing sludge and the vitriol oil, and heats chromium-bearing sludge and the vitriol oil and stir; First device for storing liquid is used for collection, ageing from isolated first supernatant liquor of electrically heated retort; Filter-pressing device is used for the first supernatant liquor after ageing to carry out press filtration, and obtains the second supernatant liquor; Second device for storing liquid is for storing the second supernatant liquor.In addition, in order to improve the purity of the second supernatant liquor, the residual impurity in the first supernatant liquor is removed as far as possible completely; Preferably, filter-pressing device is plate type pressure filter.And the first device for storing liquid and the second device for storing liquid are specifically arranged to liquid storage tank; Liquid storage tank is arranged conveniently, required with low cost, the clear liquid being convenient to very much to export from corresponding equipment is collected.
Although illustrate and describe the present invention with specific embodiment, however it will be appreciated that can to make when not deviating from the spirit and scope of the present invention many other change and amendment.Therefore, this means to comprise all such changes and modifications belonged in the scope of the invention in the following claims.
Claims (10)
1. a recoverying and utilizing method for chromium-bearing sludge, is characterized in that, comprises the following steps:
1), collect chromium-bearing sludge, and measure the content of the chromium sesquioxide contained by it;
2), according to the 65%-70% of contained chromium sesquioxide weight get the vitriol oil and dilute, the vitriol oil add dilution in described chromium-bearing sludge after, and after 90 DEG C-95 DEG C fully reaction, carrying out solid-liquid separation, obtain the first supernatant liquor;
3), by described first supernatant liquor leave standstill, and carry out press filtration after being cooled to normal temperature, obtain the second supernatant liquor;
4), described second supernatant liquor is used in tanning or retanning operation.
2. the recoverying and utilizing method of chromium-bearing sludge according to claim 1, is characterized in that, in step 1) in:
Described collection chromium-bearing sludge specifically comprises: carry out taxonomic revision to chromium-bearing sludge, obtains chromium-bearing sludge containing dyestuff and not containing the chromium-bearing sludge of dyestuff;
By described chromium-bearing sludge containing dyestuff and describedly carry out step 2 respectively containing the chromium-bearing sludge of dyestuff) and step 3);
In step 4) in, specifically comprise:
Second supernatant liquor of the chromium-bearing sludge derived from containing dyestuff is used for change colour in the tanning of hide or retanning operation, in the tanning the second supernatant liquor of the chromium-bearing sludge derived from not containing dyestuff being used for all hides or retanning operation.
3. the recoverying and utilizing method of chromium-bearing sludge according to claim 1, is characterized in that, in step 1) and step 2) between, also comprise:
Pulverize after described chromium-bearing sludge is dried to mud cake shape, obtain Powdered chromium-bearing sludge.
4. the recoverying and utilizing method of chromium-bearing sludge according to claim 1, is characterized in that, in step 2) in, described dilution is: the water dilution by concentration being the vitriol oil 3-4 times volume of 98%.
5. the recoverying and utilizing method of chromium-bearing sludge according to claim 1, is characterized in that, in step 2) in:
The time of described reaction is 3-6 hour.
6. the recoverying and utilizing method of chromium-bearing sludge according to claim 1, is characterized in that, in step 2) in:
In the process of described reaction, the vitriol oil after chromium-bearing sludge and dilution is stirred.
7. realize a device for the recoverying and utilizing method of chromium-bearing sludge according to any one of claim 1-6, it is characterized in that, comprising:
Electrically heated retort: for containing chromium-bearing sludge and the vitriol oil, and chromium-bearing sludge and the vitriol oil are heated and stirs;
First device for storing liquid: for collection, ageing from isolated first supernatant liquor of electrically heated retort;
Filter-pressing device: for the first supernatant liquor after ageing is carried out press filtration, and obtain the second supernatant liquor;
Second device for storing liquid: for storing the second supernatant liquor.
8. device according to claim 7, is characterized in that, described electrically heated retort, the first device for storing liquid, filter-pressing device, the second device for storing liquid connect successively.
9. device according to claim 7, is characterized in that, described filter-pressing device is plate type pressure filter.
10. device according to claim 7, is characterized in that, also comprises drawing liquid equipment;
Described drawing liquid equipment is used for described second supernatant liquor to be input in tanning or retanning equipment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174310A (en) * | 2015-09-01 | 2015-12-23 | 杨全坤 | Process method of producing chromium sesquioxide by utilizing industrial chromium-containing sludge |
| CN108796223A (en) * | 2018-06-26 | 2018-11-13 | 泉州师范学院 | The recovery method of chromium in a kind of high-concentration chromium-containing wastewater |
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| CN102965455A (en) * | 2012-10-29 | 2013-03-13 | 浙江特力再生资源有限公司 | Method for preparing basic chromium sulfate tanning liquor by using tanning chromium sludge |
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| CN102363820A (en) * | 2011-09-22 | 2012-02-29 | 兄弟科技股份有限公司 | Reutilization method of chromium-containing leather production sludge |
| CN102745766A (en) * | 2012-08-07 | 2012-10-24 | 陕西科技大学 | Method for treating leather dyeing wastewater by using chromium-enriched sludge |
| CN102965455A (en) * | 2012-10-29 | 2013-03-13 | 浙江特力再生资源有限公司 | Method for preparing basic chromium sulfate tanning liquor by using tanning chromium sludge |
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| CN105174310A (en) * | 2015-09-01 | 2015-12-23 | 杨全坤 | Process method of producing chromium sesquioxide by utilizing industrial chromium-containing sludge |
| CN108796223A (en) * | 2018-06-26 | 2018-11-13 | 泉州师范学院 | The recovery method of chromium in a kind of high-concentration chromium-containing wastewater |
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