CN207726838U - A kind of processing unit of titanium white production waste water - Google Patents
A kind of processing unit of titanium white production waste water Download PDFInfo
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- CN207726838U CN207726838U CN201721606201.1U CN201721606201U CN207726838U CN 207726838 U CN207726838 U CN 207726838U CN 201721606201 U CN201721606201 U CN 201721606201U CN 207726838 U CN207726838 U CN 207726838U
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Abstract
The utility model is related to a kind of processing units of titanium white production waste water, including：Wastewater trough, for storing wastewater from TiO2 factory；Coarse filter is connected to wastewater trough, and oil removal is removed for carrying out pre-filtering to wastewater from TiO2 factory；Ceramic membrane is connected to coarse filter, and secondary filter is carried out for the filtrate to coarse filter；Clear liquid tank is connected to ceramic membrane, for collecting the clear liquid obtained after ceramic membrane filter；Recoil pump, feed liquid port are connected to Clear liquid tank, and material liquid outlet is connected to the per-meate side of ceramic membrane, for being backwashed to ceramic membrane；Alkaline cleaner supply device, is connected to ceramic membrane, for alkaline cleaner to be added into ceramic membrane；Acidic cleaner supply device, is connected to ceramic membrane, for acidic cleaner to be added into ceramic membrane；Concentration of suspension detector is connected to the retention side of ceramic membrane, for detecting the suspension concentration in ceramic membrane interception liquid.
Description
Technical field
The utility model is related to a kind of processing units of titanium white production waste water, relate in particular to a kind of using cross-flow
Spent acid in filter formula ceramic membrane filter equipment concentration and recovery sulfuric acid process, one wash, two wash and three wash in waste water and chloridising and post-process
Metatitanic acid in waste water or titanium dioxide technique, belong to titanium dioxide chemical field.
Background technology
A large amount of spent acid and waste water are produced in production process of titanium pigment.It is estimated that being generated during Production By Sulfuric Acid Process useless
Acid and the scale of waste water are：Spent acid 7~11T/T titanium dioxides, a wash water wash water and two wash water 40~60T/T titanium dioxides, three wash waters
10T/T titanium dioxides, due to leaf filter（Or vacuum-type drum filter）Filtering accuracy it is low, contain in these spent acid and waste water
The metatitanic acid or titanium dioxide of 0.5g/L~2% finally still have although subsequent technique have passed through subsider, the recycling of CN filters
Metatitanic acid or the titanium dioxide loss of 0.1~0.5g/L can not recycle in spent acid and waste water.This aspect causes titanium white
The reduction of powder yield and the rate of recovery, on the other hand be lost in waste water and spent acid, be lost to final water process it is big from
In right environment, the pollution to environment is caused.The post-processing waste water of chloridising is similar to the source that three wash waters of sulfuric acid process generate,
The loss of titanium dioxide caused by thus and essentially identical to the pollution of environment and sulfuric acid process situation.
Described in technique as above, recycling of the titanium dioxide industry to metatitanic acid or titanium dioxide in these spent acid and waste water at present,
CN filters are added to be recycled after mostly using subsider.And for the partially thin problem of metatitanic acid or titanium dioxide granule, sedimentation
The effect of settling of slot is bad, often in suspended state；And CN filters can not also be accomplished due to fluctuation of service etc.
To the high rejection of metatitanic acid or titanium dioxide granule；And need to add flocculant again in CN filter operational process, it influences
Following process, increases production cost；Recently as the reduction of workshop land area, the CN filters that take up a large area
Significantly hinder the enlarged reproduction of titanium dioxide industry.Therefore use is a kind of efficiently, floor space is small, automation is of high cost,
The low technique recycling waste water of production cost and metatitanic acid in spent acid or titanium dioxide have become titanium dioxide industry when business
It is anxious.
Ceramic membrane be applied to wastewater from TiO2 factory processing recycling metatitanic acid or titanium dioxide technique, already have relevant report and
Patent application.CN2461638Y discloses a kind of ceramic membrane filter tube and filter detaching particle in wastewater from TiO2 factory, patent
Used in ceramic-film tube aperture at 1~5 μm, and be single pass.It is not all right in this obvious technique because metatitanic acid or
The granularity of titanium dioxide is at 0.7 μm or so, it is evident that if with the ceramic membrane filter in this aperture, it is existing to will produce Pore Blocking
As and cause filtering can not be normally carried out.And the filling area of single channel film is low, only can increase cost of investment.
CN103663547A patents disclose the processing of acid waste water and reuse technology in a kind of production process of titanium pigment, such technique
Front end uses the tubular membrane of 10~1000nm（Including ceramic membrane）The recycling of titanium white powder particles is carried out.CN104692456A is also public
A kind of environmentally protective sulfuric acid method titanium pigment production technology and device have been opened, has also repeatedly been mentioned with 50~500nm's in that patent
Film intercepts and recycles waste water and the metatitanic acid in spent acid and titanium dioxide granule solid.Although the two patents, which are all mentioned, uses micro-filtration
The method recycling metatitanic acid or titanium dioxide solids particle of film, but there are following drawbacks：First, the pore diameter range carried is too big, and
Titanium dioxide or metatitanic acid grain diameter are just within the scope of their fenestras used, with the membrane filtration in this aperture, it is easy to
It causes the blocking of fenestra and affects membrane process；Second is that membrane material range used is too wide, and film used is apparent in this technique
Organic film is improper, because organic film pore size distribution range is wide, has been easy macropore and titanium white powder particles is caused to block, and is organic
The material of film makes film regeneration be unable to the high-alkali cleaning of high temperature resistant peracid, and the chemical stability of titanium white powder particles is determined using normal
The cleaning of rule cannot enable film to restore cleaning and regeneration well, and the high temperature resistant of ceramic membrane and chemical stability are fine
Ground has adapted to the cleaning requirement of the technique.
Moreover, the above utility model patent be refer to using microfiltration membrane process processing recycling waste water in metatitanic acid or
Titanium dioxide, the technique that membrane filtration is not shown in detail but.In fact, using the metatitanic acid and two in the method recycling waste water of film
Titanium oxide technique can never industrialize although already it has been proposed that, and having done a large amount of experiment, main
Reason is exactly that the fouling membrane generated in membrane process and Membrane cleaning regeneration issues are never well solved.
Utility model content
The purpose of this utility model is the metatitanic acid or two carried out using Ceramic Membranes Separating Technique in titanium white production waste water
The concentration and recovery of titanium oxide, to recycle in waste water, spent acid the metatitanic acid or titanium dioxide that are in suspended state to the maximum extent
Grain, significant economy and environmental benefit are brought to the processing of wastewater from TiO2 factory.
Serious for fouling membrane in solution membrane process, fenestra easily blocks, and cleaning and regeneration restores difficult bottleneck problem, this patent
The aperture screening mechanism of technical basis film, starts with from the selection of film, searches out the film of suitable aperture and material, avoids stifled to fenestra
Plug is formed then by the process optimization of ceramic membrane to reduce the metatitanic acid occurred in membrane process or the easy absorption of titanium dioxide
Film surface pollution, cleaning and regeneration is carried out to the film of pollution finally by suitable cleaning and cleaning agent is selected so that ceramics
The flux of film is regenerated recovery well after filtering after a period of time.The results show：The stable operation week of ceramic membrane
Phase has reached 1 month or more, and flux maintains always 500L/m2H (except spent acid), Membrane cleaning regeneration recovery rate reach
98% or more.
A kind of processing method of titanium white production waste water, includes the following steps：
1st step filters titanium white production waste water using coarse filter；
The filtrate that 1st step obtains is sent into ceramic membrane and is filtered concentration by the 2nd step；
3rd step is stopped after the weight of concentrate metatitanic acid and titanium dioxide reaches setting concentration in ceramic membrane filter concentration
Only concentrate；
4th step cleans the ceramic membrane after the 3rd step concentration operation.
In 1st step, titanium white production waste water refers to being generated in production process of titanium pigment containing certain density inclined
Metatitanic acid or titanium dioxide waste water.
The titanium white production waste water be spent acid during method for producing gtitanium dioxide with sulphuric acid, a wash water, two wash waters or
Three wash waters；Post-processing waste water either in chloridising.
In 1st step, the filtering accuracy of coarse filter is in 1mm or less.
In 2nd step, 0.02 μm~0.1 μm, preferably 0.02~0.05 μm of the average pore size of ceramic membrane；Ceramic membrane
It is to be made of supporter and the separating layer being overlying on supporter, supporter material is the Alpha-alumina that purity is more than 99wt%, point
Absciss layer material is the mixing of one or more of aluminium oxide, zirconium oxide, titanium oxide, and separation layer thickness is 10~100 μm, preferably
It is 10~20 μm；The porosity of ceramic membrane is more than 37%, and membrane aperture is in 0.02 μm~0.1 μm, preferably 0.02~0.05 μm.Film
Element uses internal pressure tubular type membrane structure.
In 2nd step, the filter pressure of ceramic membrane concentration process is 0.05~0.5Mpa, preferably 0.05~
0.3MPa；Crossflow velocity is 1~5m/s, preferably 2.5~3.5m/s；Temperature is at 30~60 DEG C.
In 2nd step, need to carry out periodical backwash in ceramic membrane concentration process.
The backflushing medium periodically backwashed be ceramic membrane produce water, recoil cycle be 15~60min, recoil time be 10~
15s, kickback pressure are 0. 4~0.7MPa.
In 3rd step, stop isolating partially in the ceramic membrane concentrate obtained after concentration feeding equipment for separating liquid from solid
Metatitanic acid or titanium dioxide.
In 3rd step, setting concentration is 100 ~ 200g/L.
In 4th step, cleaning process is to be cleaned successively using alkaline cleaner and acidic cleaner.
The alkaline cleaner includes following component by weight percentage：20~50% sodium hydroxides, 5~15%
Sodium carbonate, 5~15% sodium metasilicate, 0.5~6% sodium carboxymethylcellulose, 0.5~5% lauryl sodium sulfate, 0.5~10% second two
Amine tetrem acid sodium-salt, 5~20% sodium tripolyphosphates.
The acidic cleaner is mixed by one or more of citric acid, nitric acid or hydrochloric acid.
Use concentration of the alkaline cleaner in cleaning process is 1~2%.
Use concentration of the acidic cleaner in cleaning process is 0.5~2%.
Temperature when cleaning is 55~80 DEG C, preferably 60~75 DEG C, and cleaning uses wash cycles mode, and when cleaning keeps
Pressure is in 0.2MPa hereinafter, crossflow velocity is in 3m/s or more, scavenging period 1h；Also to coordinate in cleaning process periodically online
Backwash technique, 10~20min of recoil cycle, 10~20s of recoil time, 0.4~0.7MPa of kickback pressure.
A kind of processing unit of titanium white production waste water, including：
Wastewater trough, for storing wastewater from TiO2 factory；
Coarse filter is connected to wastewater trough, and oil removal is removed for carrying out pre-filtering to wastewater from TiO2 factory；
Ceramic membrane is connected to coarse filter, and secondary filter is carried out for the filtrate to coarse filter；
Clear liquid tank is connected to ceramic membrane, for collecting the clear liquid obtained after ceramic membrane filter；
Recoil pump, feed liquid port are connected to Clear liquid tank, and material liquid outlet is connected to the per-meate side of ceramic membrane, for ceramic membrane
It is backwashed；
Alkaline cleaner supply device, is connected to ceramic membrane, for alkaline cleaner to be added into ceramic membrane；
Acidic cleaner supply device, is connected to ceramic membrane, for acidic cleaner to be added into ceramic membrane；
Concentration of suspension detector is connected to the retention side of ceramic membrane, for detecting the suspension in ceramic membrane interception liquid
Concentration.
The utility model additionally provides above-mentioned alkaline cleaner and acidic cleaner is filtered applied to wastewater from TiO2 factory
The application in ceramic Membrane cleaning afterwards.
Advantageous effect
In this patent technique, for the purpose of recycling metatitanic acid and titanium dioxide in titanium dioxide wastewater, from suitable aperture and material
The selection of the film of matter is started with, and by using suitable operating procedure, reduces the absorption of metatitanic acid and titanium dioxide on the surface of the film,
Avoid the blocking of fenestra.And it is equipped with suitable cleaning agents of membrane and cleaning on this basis so that the film of pollution is cleaned
Regeneration, to restore filtration flux, membrane flux regeneration response rate has reached 98% or more.This patent technique is breached to be recycled with film
Pore Blocking when metatitanic acid and titanium dioxide in wastewater from TiO2 factory and the bottleneck for being unable to cleaning and regeneration so that the industry of the technique
Change operation steady in a long-term is possibly realized, and has apparent advance, with traditional sedimentation, the filtering of CN filters and organic membrane filter
It compares, there is following superiority：
1, the utility model provides metatitanic acid and titanium dioxide in a kind of ceramic membrane concentration and recovery titanium white production waste water
Titanium technique.Compared with organic film, the narrow pore-size distribution of ceramic membrane makes the aperture precision of ceramic membrane relatively high, is closed by selecting
The film in suitable aperture can block to avoid fenestra, while the high intensity of ceramic membrane can not only make it bear higher recoil pressure
Power and fenestra is not destroyed, and also avoid the organic film consequence that fenestra becomes larger, is selectively deteriorated after frequent recoil.In this way
It is adopted in the lower operation of low-pressure and suitable crossflow velocity by the selection in high-throughput suitable aperture and the ceramic membrane of material
With constant concentration multiple concentration operation, it is aided with timing recoil technique, reduces fouling membrane, avoid Pore Blocking so that ceramic membrane
Energy longtime running, greatly increases the efficiency of concentration and recovery titanium dioxide under high throughput.And the ceramics in the utility model
Film device have it is small, floor space is small, it is simple for process, be easy amplification, can continuous and automatic operation.Avoid traditional sink
Drop, CN filter filtering and concentratings are slow, efficiency is low, take up a large area, bulky disadvantage.
2, compared with tradition sedimentation and CN filter filtering techniques, the high-precision filtration of ceramic membrane makes metatitanic acid and dioxy
The recovering effect for changing titanium is more stable.As described above, the high-precision of ceramic membrane not only makes the danger of Pore Blocking be avoided, and
And the smaller metatitanic acid of granularity and titanium dioxide granule are trapped, to the rejection of the titanium dioxide in entire waste water
It is improved, the rate of recovery of titanium dioxide also further increases.The titanium white powder content of the Nature is lost in waste water to be reduced,
Improve economic benefit and environmental benefit.
3, compared with tradition sedimentation and CN filter filtering techniques, ceramic membrane filter is using aperture screening mechanism in pressure
It works under effect, is a kind of separation of pure physical process, flocculant need not be added in the process, thus either concentrate
The obtained clarified solution that obtained high concentration slurry still filters, is not polluted by flocculant, is conducive to the place of next procedure
Reason.Reduce operation cost.It is beneficial to the raising of titanium dioxide product quality.
4, compared with organic film, the cleaning and regeneration technique in the utility model, using compound alkaline cleaner and conventional acid
The alternately technique of cleaning and regeneration, and reached 55 DEG C or more of HIGH TEMPERATURE PURGE in temperature, this is that organic film institute is unaffordable.
But this is cleaned necessary to the fouling membrane of titanium dioxide in this technique again.Therefore this is a big characteristic of this patent technique, and
This patent is able to industrialize the quantum jump run steadily in the long term.
5, in terms of Cleaning principle：This patent cleaning combines the particularity of cleaning agent and cleaning.Alkalinity cleaning
In agent, the effect of sodium hydroxide and sodium carbonate be make in film surface cake layer and fouling be wrapped in titanium dioxide dirt
It is removed.Titanium dioxide in three wash waters of sulfuric acid process, the post-processing water of chloridising is existed in the form of coating, peplos
Ingredient is often the silica and aluminium oxide after hydrolysis.Due to the longtime running of film, these are wrapped in the titanium dioxide of outer membrane
It is attracted to film surface, forms membrane contaminant, these peploses are exactly dissolved with highly basic using alkali cleaning at high temperature, then in height
Under the surface shear stress effect of cross-flow velocity, it is washed into cleaning solution, anti-deposition agent sodium metasilicate and carboxylic first in cleaning solution
Under the effects that base sodium cellulosate, lauryl sodium sulfate, sodium tripolyphosphate emulsification under, can make these membrane contaminants generate
Suspension effect is stable in the presence of in cleaning solution, it is prevented to be adsorbed in film surface again；And in the spent acid of sulfuric acid process and two wash waters
Metatitanic acid be titanium dioxide forerunner's phase product, on the one hand when cleaning, is weakened by the shear action of high crossflow velocity in film surface
Absorption deposition, on the other hand utilizes its amphotericity, not only forms titanate with alkali carbonate, but also can be dissolved in strong acid property,
Cleaning is integrated by highly basic, strong acid, high temperature so that the metatitanic acid pollutant on film surface is removed.
6, it can be seen that from the formula of cleaning agent：This cleaning agent is compounded as main component using conventional chemical agent
, thus the cost of cleaning agent is not high, and make ceramic membrane process by the selection of ceramic membrane and the optimization of operating procedure
It is capable of the operation that longer-term is stablized, longest has reached 1 month cleaning primary period, thus the use cost of cleaning agent is not yet
Height also provides strong guarantee economically to the industrialization of the technique.
Description of the drawings
Fig. 1 is the process flow chart of method provided by the utility model.
A, ceramic membrane raw water tank；B, ceramic membrane purge tank；C, ceramic membrane charging pump；D, coarse filter；E, ceramic membrane filter
Device；F, g, h, l, control valve；1, raw water；2, ceramic membrane clear liquid；3, ceramic membrane concentrate；4, ceramic membrane cleaning agent.
Fig. 2 is the installation drawing used.
1, wastewater trough；2, coarse filter；3, ceramic membrane；4, Clear liquid tank；5, recoil pump；6, alkaline cleaner supply device；7、
Acidic cleaner supply device；8, concentration of suspension detector.
Specific implementation mode
Percentage described in the utility model refers to weight percent in the case of no special instruction.
The art of this patent utilize ceramic membrane aperture screening mechanism, selected the ceramic membrane of suitable aperture and material as
Filtering element searches out suitable filter condition on the basis of to ceramic membrane filter process optimization, avoids blocking and the drop of fenestra
The absorption of the titanium dioxide or metatitanic acid of low film surface, so that highly stable in ceramic membrane concentration process.And maintain always compared with
High filtration flux.Furthermore by searching out suitable complex cleaning and washing agent and suitable cleaning method, to the ceramic membrane of pollution into
Row restores regeneration so that the Membrane cleaning regeneration issues of ceramic membrane are resolved, inclined in recycling waste water to breach ceramic membrane
The industrialization bottleneck of metatitanic acid or titanium dioxide, the thus industrialization early of technique open smoothly channel.
The technique of metatitanic acid or titanium dioxide in ceramic membrane concentration and recovery titanium white production waste water provided by the utility model,
Including：Step 1：By leaf filter suction piece（Or vacuum drum）The filtrate waste water and spent acid filtered first passes through precision 1mm or less
Coarse filter filtering after, squeezed into ceramic membrane filter equipment with slush pump；Step 2：Select the ceramics of suitable aperture and material
Film, control ceramic membrane certain operating pressure and crossflow velocity, takes the mode of constant concentration multiple to be filtered concentration metatitanic acid
Or titanium dioxide, online periodically backwash is carried out to ceramic membrane in the process；Step 3：Wait for that metatitanic acid or titanium dioxide in dope arrive
Up to 100g/L or more, dope is continuously discharged by the cocnentration factor of setting, dope returns in hollander tub uses leaf filter or vacuum to turn again
Drum filter is filtered to recycle metatitanic acid or titanium dioxide；Step 4：When the flux ratio of ceramic membrane design flux has dropped 20%, adopt
The cleaning and regeneration of ceramic membrane is carried out with suitable cleaning.The cleaning and regeneration technique of ceramic membrane uses the cleaning agent of formulated
Cleaning and regeneration is carried out under certain temperature and time with common acid, using the cycle of high crossflow velocity low-pressure when cleaning and regeneration
Cleaning way will also coordinate periodical online backwashing technique in the process.
Pending waste water in above-mentioned technique be generated in production process of titanium pigment containing certain density metatitanic acid or
Titanium dioxide waste water can be spent acid in sulfuric acid process, one wash, two wash or even three wash waters, can also be the rear place in chloridising
Manage waste water.
Pending waste water in step 1 must first pass through precision 1mm coarse filter filterings below to remove bulky grain
Solid or impurity avoid blocking membrane channels.Ceramic membrane mistake can be just got to slush pump by the filtered waste water of coarse filter
It is filtered in filter equipment.
Ceramic membrane filter is carried out from the head tank that the waste water in step 1 out gets to ceramic membrane equipment with slush pump, is walked
Ceramic membrane equipment filter type in rapid 2 is cross-flow filtration, and using constant concentration multiple filtering mode, cycles of concentration regards in waste water
Depending on the solid content of metatitanic acid or titanium dioxide, it is limited no more than 200g/l with dope concentration；Filter pressure is 0~0.5MPa,
Preferably 0.05~0.3MPa；Crossflow velocity is 1~5m/s, preferably 2.5~3.5m/s；Temperature is at 30~60 DEG C.
To ensure the flux stabilized of ceramic membrane filter process in step 2 and reducing film surface pollution, in membrane filtration processes, it is equipped with
Recoil technique appropriate, backflushing medium are that ceramic membrane produces water, and recoil cycle is 15~60min, and recoil time is 10~15s, instead
Stamping press is 0. 4~0.7MPa.
Membrane component material in ceramic membrane equipment in above-mentioned steps 2 is that supporter purity is more than 99% Alpha-alumina, separation
Layer is the ceramics such as aluminium oxide, zirconium oxide, titanium oxide, and thicknesses of layers is 10~100 μm, preferably 10~20 μm.Porosity is more than
37%, it is anisotropic membrane, membrane aperture is in 0.02 μm~0.1 μm, preferably 0.02~0.05 μm.Membrane component uses internal pressure tubular membrane
Structure.The water flux of ceramic membrane is 500L/m2.h more than（0.1MPa is detected at 25 DEG C）.
To ensure that safe concentration of the solid content no more than 200g/L is run in ceramic membrane dope, the utility model technique step
When metatitanic acid or content of titanium dioxide reach 100g/L or more in the concentrate of ceramic membrane thickening filtration in rapid 3, by setting
Dope is continuously discharged in cocnentration factor, and dope is returned in hollander tub and filtered again with leaf filter or vacuum-type drum filter to recycle inclined titanium
Acid or titanium dioxide.And clear liquid then circulating and recovering or enter subsequent treatment process.
When fouling membrane increase to a certain extent when, need to carry out cleaning and regeneration to polluted membrane, can just enable film high-throughput
Operation, so that it is guaranteed that engineering trouble-free operation.In the utility model processing step 4, when the flux ratio of ceramic membrane designs flux
When having dropped 20%, the cleaning and regeneration of ceramic membrane need to be carried out.And the cleaning and regeneration technique of ceramic membrane then uses the regeneration of formulated
Cleaning agent cooperation is commonly used soda acid wash cycles under certain temperature and time and is regenerated.
In the regeneration technology of above-mentioned steps 4, regeneration cleaning agent is compound for alkalinity, including 20~50% sodium hydroxides, 5
~15% sodium carbonate, 5~15% sodium metasilicate, 0.5~6% sodium carboxymethylcellulose, 0.5~5% lauryl sodium sulfate, 0.5~10%
Disodium edta, 5~20% sodium tripolyphosphates.Use a concentration of 1~2%.Common acid is citric acid, nitric acid, hydrochloric acid.Make
With a concentration of 0.5%~2%.
In the regeneration technology of above-mentioned steps 4, in addition to the regeneration cleaning agent for using formulated, additionally use special clear
Wash technique：Temperature when cleaning is 55~80 DEG C, preferably 60~75 DEG C.Cleaning uses wash cycles mode, when cleaning to keep
For pressure in 0.2MPa hereinafter, crossflow velocity is in 3m/s or more, the wash cycles time is 1h.Cleaning agent and acid alternately clean.Cleaning
Also to coordinate periodical online backwashing technique in the process.10~20min of recoil cycle, 10~20s of recoil time, kickback pressure
0.4~0.7MPa.
Pass through the regeneration washing process of above step 4 so that contaminated membrane flux is restored regeneration, ensures that
Industrialized operation steady in a long-term.
Based on above method, the device of use is as shown in Fig. 2, device includes：
Wastewater trough 1, for storing wastewater from TiO2 factory；
Coarse filter 2 is connected to wastewater trough 1, and oil removal is removed for carrying out pre-filtering to wastewater from TiO2 factory；
Ceramic membrane 3 is connected to coarse filter 2, and secondary filter is carried out for the filtrate to coarse filter 2；
Clear liquid tank 4 is connected to ceramic membrane 3, for collecting the clear liquid obtained after ceramic membrane 3 filters；
Recoil pump 5, feed liquid port are connected to Clear liquid tank 4, and material liquid outlet is connected to the per-meate side of ceramic membrane 3, for pottery
Porcelain film 3 is backwashed；
Alkaline cleaner supply device 6 is connected to ceramic membrane 3, for alkaline cleaner to be added into ceramic membrane 3；
Acidic cleaner supply device 7 is connected to ceramic membrane 3, for acidic cleaner to be added into ceramic membrane 3；
Concentration of suspension detector 8 is connected to the retention side of ceramic membrane 3, for detecting the suspension in 3 trapped fluid of ceramic membrane
Liquid concentration.
Reference examples 1
Two wash waters of sulfuric acid method titanium pigment production, the 1g/L of concentration containing metatitanic acid, sulfur acid 4~6%, temperature 50 C.It is beaten with pump
After entering settling tank, 0.1% polyacrylamide flocculating setting is added, it is 0.6g/L to contain metatitanic acid in supernatant, and supernatant gets to CN again
In filter, a concentration of 0.3g/L of metatitanic acid in water outlet.
Embodiment 1
Same two wash water 1 is used into the utility model process, into cross-flow filtration formula ceramic membrane as shown in Figure 1
In filtration system.First two wash waters 1 are got in ceramic membrane head tank a, 1mm coarse filter d mistakes below are passed through by charging pump c
It after filter, gets in purpose ceramic-film filter e, carries out thickening filtration, control pressure 0.1MPa, crossflow velocity 3m/s, temperature is
50℃.Membrane component is alumina ceramic membrane, aperture 50nm.It is primary with production water recoil per 20min in filter process, kickback pressure
For 0.5MPa.It is 100 to control cycles of concentration.The flux of film is in 600~800 L/m2H or more.The turbidity of membrane filtration clear liquid 2 reaches
To 0.25NTU, the amount containing metatitanic acid is 0, and the solid content of dope 3 has reached 100g/L.Membrane process stable operation 1 month.With
The progress for filter process waits for that flux drops to 500 L/m2When h, the dope in equipment is exhausted, film and equipment are carried out clear
Wash regeneration.First with 1% alkaline cleaner 4 under temperature 60 C wash cycles 1h, keep when cleaning pressure in 0.2MPa hereinafter, film
After surface current speed is flushed to neutrality after 3m/s or more, cleaning with clear water, then with 1% hydrochloric acid temperature be 60 DEG C at wash cycles 1h,
It is rinsed with water neutrality, is equipped with periodical backwash, recoil cycle 10min, recoil time 12s, kickback pressure in the process
0.5MPa.Water flux, 98% or more flux recovery rate are surveyed after the completion of cleaning.Subsequently into next round circulating filtration process.
Reference examples 2
Three wash waters of sulfuric acid method titanium pigment production, 0.7g/L containing titanium dioxide concentration, pH=7~8, temperature 50 C.It is beaten with pump
After entering settling tank, 0.1% polyacrylamide flocculating setting is added, it is 0.5g/L to contain titanium dioxide in supernatant, and supernatant is got to again
In CN filters, the titanium dioxide concentration in water outlet is 0.25g/L.
Embodiment 2
Same three wash water 1 is used into the utility model process, into cross-flow filtration formula ceramic membrane as shown in Figure 1
In filtration system.First three wash waters 1 are got in ceramic membrane head tank a, 1mm coarse filter d mistakes below are passed through by charging pump c
It after filter, gets in purpose ceramic-film filter e, carries out thickening filtration, control pressure 0.15MPa, crossflow velocity 2.5m/s, temperature
It is 45 DEG C.Membrane component is alumina ceramic membrane, aperture 50nm.It is primary with production water recoil per 20min in filter process, recoil pressure
Power is 0. 5MPa.It is 150 to control cycles of concentration.The flux of film is in 550~800 L/m2H or more.Membrane filtration clear liquid 2 it is turbid
Degree reaches 0.25NTU, and the amount containing titanium dioxide is 0, and the solid content of dope 3 has reached 105g/L.Membrane process stable operation 25
It.With the progress of filter process, wait for that flux drops to 500 L/m2When h or less, the dope in equipment is exhausted, to film and is set
It is standby to carry out cleaning and regeneration.1h is first cleaned at 65 DEG C of temperature with 1% alkaline cleaner 4, cleaning uses wash cycles mode, cleaning
When keep pressure in 0.2MPa hereinafter, after crossflow velocity is flushed to neutrality after 3m/s or more, cleaning with clear water, then with 1% nitric acid
Wash cycles 1h at being 60 DEG C in temperature, is rinsed with water during neutral and is equipped with periodical backwash, recoil cycle 10min,
Recoil time 12s, kickback pressure 0.5MPa.Water flux, 98% or more flux recovery rate are surveyed after the completion of cleaning.Then into
Enter next round circulating filtration process.
Reference examples 3
The spent acid of sulfuric acid method titanium pigment production, the 0.65g/L of concentration containing metatitanic acid, sulfuric acid content 23%, temperature 50 C.With pump
After squeezing into settling tank, 0.1% polyacrylamide flocculating setting is added, it is 0.5g/L to contain metatitanic acid in supernatant, and supernatant is got to again
In CN filters, a concentration of 0.25g/L of metatitanic acid in water outlet.
Embodiment 3
Same spent acid 1 is used into the utility model process, into cross-flow filtration formula ceramic membrane mistake as shown in Figure 1
In filter system.First two wash waters 1 are got in ceramic membrane head tank a, are filtered by 1mm coarse filter d below by charging pump c
Afterwards, it gets in purpose ceramic-film filter e, carries out thickening filtration, control pressure 0.12MPa, crossflow velocity 3m/s, temperature 50
℃.Membrane component is alumina ceramic membrane, aperture 20nm.Primary with production water recoil per 10min in filter process, kickback pressure is
0. 5MPa.It is 100 to control cycles of concentration.The flux of film is in 200~600 L/m2H or more.The turbidity of membrane filtration clear liquid 2 reaches
To 0.25NTU, the amount containing metatitanic acid is 0, and the solid content of dope 3 has reached 65g/L.Membrane process stable operation 20 days.With
The progress of filter process waits for that flux drops to 200 L/m2When h, the dope in equipment is exhausted, film and equipment are cleaned
Regeneration.First 1h is cleaned under temperature 60 C with 1% alkaline cleaner 4, cleaning uses wash cycles mode, and when cleaning keeps pressure
In 0.2MPa hereinafter, after crossflow velocity is flushed to neutrality after 3m/s or more, cleaning with clear water, then with 1% hydrochloric acid in temperature it is 60
Wash cycles 1h at DEG C, is rinsed with water neutrality, is equipped with periodical backwash, recoil cycle 10min, recoil time in the process
12s, kickback pressure 0.5MPa.Water flux, 98% or more flux recovery rate are surveyed after the completion of cleaning.Subsequently into next round
Circulating filtration process.
Reference examples 4
It is illustrated in same similar ceramic membrane in order to illustrate the film operation of this technique and regeneration technology reliability, reference examples 4
Different process flux operation under system operation situation and regeneration washing situation：
Three wash waters are got in ceramic membrane head tank, by charging pump after 1mm coarse filter filterings below, are got to
In purpose ceramic-film filter, thickening filtration, control pressure 0.4MPa, crossflow velocity 3m/s are carried out, temperature is 45 DEG C.Membrane component
For alumina ceramic membrane, aperture 200nm.Primary with production water recoil per 20min in filter process, kickback pressure is 0. 5MPa.
The flux of film is in 250~1000 L/m2It has only been run between h 2 days.The solid content of concentrate is only 50g/L.Cycles of concentration
It is 50.Last flux drops to 250 L/m2When h or so.The dope in equipment is first exhausted when cleaning, is existed with 1% sodium hydroxide
Clean 1h under temperature 60 C, cleaning uses wash cycles mode, and when cleaning keeps pressure in 0.3MPa hereinafter, crossflow velocity exists
2m/s, after being flushed to neutrality with clear water after cleaning, then with 1% nitric acid temperature be 60 DEG C at wash cycles 1h, in being rinsed with water
Property, it is equipped with periodical backwash, recoil cycle 10min, recoil time 12s, kickback pressure 0.5MPa in the process.After the completion of cleaning
Water flux is surveyed, flux recovery rate only has 60%.
Embodiment 4
Three wash waters 1 use the utility model process, into cross-flow filtration formula ceramic membrane filter system as shown in Figure 1
In.First three wash waters 1 are got in ceramic membrane head tank a, by charging pump c after 1mm coarse filter d filterings below, are beaten
Into purpose ceramic-film filter e, thickening filtration, control pressure 0.15MPa, crossflow velocity 2.5m/s are carried out, temperature is 45 DEG C.
Membrane component is alumina ceramic membrane, aperture 50nm.It is primary with production water recoil per 20min in filter process, kickback pressure 0.
5MPa.It is 150 to control cycles of concentration.The flux of film is in 550~800 L/m2H or more.The turbidity of membrane filtration clear liquid 2 reaches
0.25NTU, the amount containing titanium dioxide are 0, and the solid content of dope 3 has reached 105g/L.Membrane process stable operation 25 days.With
The progress of filter process waits for that flux drops to 500 L/m2When h, the dope in equipment is exhausted, film and equipment are cleaned
Regeneration.First 1h is cleaned under temperature 60 C with 1% alkaline cleaner 4, cleaning uses wash cycles mode, and when cleaning keeps pressure
In 0.2MPa hereinafter, after crossflow velocity is flushed to neutrality after 3m/s or more, cleaning with clear water, then with 1% nitric acid in temperature it is 60
Wash cycles 1h at DEG C, is rinsed with water neutrality, is equipped with periodical backwash, recoil cycle 10min, recoil time in the process
12s, kickback pressure 0.5MPa.Water flux, flux recovery rate 98% are surveyed after the completion of cleaning.
Claims (3)
1. a kind of processing unit of titanium white production waste water, which is characterized in that including：
Wastewater trough (1), for storing wastewater from TiO2 factory；
Coarse filter (2) is connected to wastewater trough (1), and oil removal is removed for carrying out pre-filtering to wastewater from TiO2 factory；
Ceramic membrane (3) is connected to coarse filter (2), and secondary filter is carried out for the filtrate to coarse filter (2)；
Clear liquid tank (4) is connected to ceramic membrane (3), for collecting the clear liquid obtained after ceramic membrane (3) filtering；
Recoil pump (5), feed liquid port are connected to Clear liquid tank (4), and material liquid outlet is connected to the per-meate side of ceramic membrane (3), for pair
Ceramic membrane (3) is backwashed；
Alkaline cleaner supply device (6) is connected to ceramic membrane (3), for alkaline cleaner to be added into ceramic membrane (3)；
Acidic cleaner supply device (7) is connected to ceramic membrane (3), for acidic cleaner to be added into ceramic membrane (3)；
Concentration of suspension detector (8) is connected to the retention side of ceramic membrane (3), outstanding in ceramic membrane (3) trapped fluid for detecting
Supernatant liquid concentration.
2. the processing unit of titanium white production waste water according to claim 1, which is characterized in that the porosity of ceramic membrane is big
In 37%.
3. the processing unit of titanium white production waste water according to claim 1, which is characterized in that the average pore size of ceramic membrane
0.02 μm~0.1 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108658270A (en) * | 2017-11-27 | 2018-10-16 | 江苏久吾高科技股份有限公司 | A kind of processing method and processing device of titanium white production waste water |
| CN110127938A (en) * | 2019-05-10 | 2019-08-16 | 苏州昌泽环保工程科技有限公司 | Waste water treatment system and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108658270A (en) * | 2017-11-27 | 2018-10-16 | 江苏久吾高科技股份有限公司 | A kind of processing method and processing device of titanium white production waste water |
| CN110127938A (en) * | 2019-05-10 | 2019-08-16 | 苏州昌泽环保工程科技有限公司 | Waste water treatment system and processing method |
| CN110813098A (en) * | 2019-11-18 | 2020-02-21 | 上海安赐环保科技股份有限公司 | Sulfuric acid method titanium dioxide production method and cleaning method of membrane equipment |
| CN112194334A (en) * | 2020-09-25 | 2021-01-08 | 南京工业大学 | Method for dehydrating materialized sludge |
| CN112624267A (en) * | 2020-12-17 | 2021-04-09 | 襄阳龙蟒钛业有限公司 | Titanium dioxide production reclaimed water recycling treatment method and treatment system thereof |
| CN114604990A (en) * | 2022-03-24 | 2022-06-10 | 合肥创想能源环境科技有限公司 | Energy-saving membrane integrated nano powder washing and purifying zero-discharge process |
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