CN205381963U - Spent acid membrane integrated process recovery unit in titanium white powder production process - Google Patents
Spent acid membrane integrated process recovery unit in titanium white powder production process Download PDFInfo
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- CN205381963U CN205381963U CN201521083139.3U CN201521083139U CN205381963U CN 205381963 U CN205381963 U CN 205381963U CN 201521083139 U CN201521083139 U CN 201521083139U CN 205381963 U CN205381963 U CN 205381963U
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Abstract
The utility model relates to a spent acid membrane integrated process recovery unit in titanium white powder production process, specifically speaking relate to one kind and utilize metatitanic acid in the spent acid that membrane integrated process technology retrieved and to produce, ferrous sulfate and sulphuric acid etc. To have the valence resource in the titanium white powder production process, belong to the titanium white powder production field. The utility model discloses to the sulphuric acid of ferric salt content and high concentration, adopt multiple stripping technique to integrated with conventional art (crystallization and filtration technology ), the ferric salt is got rid of in sour with the sulfur waste, and concentrated sulphuric acid has improved vitriolic availability factor to about 70%, has produced high -quality water and has carried out the technology retrieval and utilization.
Description
Technical field
This utility model relates to the integrated process retracting device of spent acid film in a kind of production process of titanium pigment, relate in particular to and a kind of utilize film integrated treatment process to reclaim in the spent acid produced in production process of titanium pigment the valuable resources such as metatitanic acid, ferrous sulfate and sulphuric acid, belong to field of titanium dioxide production.
Background technology
In the process of Production By Sulfuric Acid Process titanium white, often produce 1t titanium white by generation about 8～10t20% spent acid, except containing main component H in spent acid2SO4Outward, possibly together with certain FeSO4、TiO2、Al2(SO4)3、MgSO4Deng material, its composition is in Table 1.If the not treated direct discharge of these spent acid, not only contaminated environment, also result in the serious waste of resource.How to process these spent acid, reclaim wherein valuable part economically, it has also become an important technology difficult problem of Production By Sulfuric Acid Process titanium white, be also the significant problem of puzzlement environmental conservation and titanium dioxide industry development.
Spent acid composition in table 1 production process of titanium pigment
For the processing method of spent acid, the method for industrial applications has at present both at home and abroad: waste acid concentration method, neutralization precipitation method and comprehensive utilization produce various sulfate.Waste acid concentration method mainly heats spent acid, makes sulfuric acid concentration increase, is then back to hydrolysis procedure.Owing to the raising of sulfuric acid concentration makes the ferrous sulfate being dissolved in spent acid precipitate out with the form of ferrous sulfate monohydrate in process, cause that the sulfuric acid concentration after concentration is not high, it is impossible to well reuse.Neutralization precipitation method mainly adopts in limestone or Calx and the method for spent acid, and side-product is GYPSUM RUBRUM.This method also exists that reagent consumption is big, and sulphuric acid does not reclaim, and the sewage after neutralization is possibly together with some heavy metal elements, and due to saturated and cannot recycle by calcium sulfate；After neutralization, amount of gypsum is relatively big, but purposes is few, therefore slack market.Comprehensive use is mainly treatment in accordance with local conditions, Waste Sulfuric Acid produces various sulfate product, such as zinc sulfate, manganese sulfate, ammonium sulfate, phosphate fertilizer etc..These methods or sulfuric acid amount used are little, or have impact on the purity of product in the product produced containing substantial amounts of iron salt.Thus not there is industrialized popularization value.
In production process of titanium pigment, leaf filter after being hydrolyzed produced washes suction piece water, sulfur acid 20～25%, ferrous sulfate 10%～15%.The iron salt of such high concentration produces significantly high osmotic pressure, as directly with nanofiltration membrane, generally required and be operated (> 5MPa with high pressure), and the existing the highest operation pressure of common NF membrane i.e. 4.2MPa, thus tend not to meet industrialized production.
Membrance separation, as a kind of novel separation means, early has application in the process of titanium dioxide acid waste water.CN103663547A discloses this membrane separation treating process, but what it processed is actually a kind of acid waste water, sulfur acid is 0.3～4%, iron ion 1500～2500mg/L, all relatively low containing acid and iron concentration, thus can carry out desalination by NF membrane, but the iron concentration sulphuric acid more than 40g/L, more than 20% can not be carried out separating of ferrous sulfate and sulphuric acid by it within the scope of 0.1～1MPa.CN104692456A also discloses the titanium pigment waste acid of a kind of NF membrane and processes technique, although the pressure of process increases, but still can not reach after coagulation iron ion in the purpose of below 1g/L.Thus the calcining kiln spray liquid use as calcining tail gas can only be sent to for clear liquid after processing, and the higher sulphuric acid of high concentration purity can not be made and use.
Summary of the invention
The purpose of this utility model is the spent acid utilizing membrane separation and integration technology to process in production process of titanium pigment, sulphuric acid for ferric salt content and high concentration, adopt multiple film technology, and it is integrated with conventional art (crystallization and filtering technique), ferric salt in Waste Sulfuric Acid is removed, and concentrated vitriol is to about 70%, improve the service efficiency of sulphuric acid, create high-quality water and carry out technique reuse.Adopt this technique, not only increase purity and the concentration of produced sulphuric acid, decrease isorrheic pressure in production process of titanium pigment, reduce volume and the cost of investment of equipment, and the high-quality water produced in process can be carried out reuse.Not only improve the energy-saving and emission-reduction of environmental protection, save again the water consumption of technique, create good economic and environmental benefit.
The art of this patent adopts the method for first freezing and crystallizing, after the high ferrous sulfate major part in sulfuric acid wastewater containing being removed with crystal form so that the concentration of ferrous sulfate therein is reduced.Do so, reduce the iron salt concentration entering NF membrane on the one hand, the operation pressure making NF membrane reduces, nanofiltration process is possibly realized, on the other hand owing to the iron salt concentration of charging reduces, in the clear liquid that nanofiltration obtains, iron concentration also reduces accordingly, reaches the level of 1g/L, the crystallization avoiding ferrous sulfate monohydrate in subsequent concentration process produces, and meets the demand that the sulphuric acid after purification concentrates further.
The integrated process recovery process of spent acid film in a kind of production process of titanium pigment, comprises the steps:
1st step, carries out solid-liquid separation to spent acid, removes metatitanic acid, and obtains the first filtrate；
2nd step, precipitates out the ferrous sulfate crystallization in the first filtrate, and crystallization is removed by the method for solid-liquid separation, obtains the second filtrate；
3rd step, by the second filtrate nanofiltration membrane, removes ferrous sulfate, and obtains nanofiltration permeate.
Sulfuric acid content 15～28wt% in spent acid, it is preferable that 20～25%；Ferrous sulfate content 6～22wt%, it is preferable that 10～15%.
In the 1st described step, solid-liquid separation refers to the method adopting membrance separation；In membrance separation, produced concentrated solution is additionally separated metatitanic acid by the method for plate-and-frame filtration again.
In the 2nd described step, the step of crystallization refers to employing crystallisation by cooling or condensing crystallizing；The temperature range of described crystallisation by cooling is-10～0 DEG C.
In the 2nd described step, solid-liquid separation refers to the method adopting disk filter and/or membrance separation.
In the 3rd described step, the running temperature of NF membrane is 15～40 DEG C, and pressure is 2～8MPa.Cycles of concentration is 2～6 times；NF membrane is under 4MPa, to the magnesium sulfate rejection rate of 2g/L more than 96%.
Nanofiltration permeate is concentrated, is recycled sulphuric acid；Concentration adopts vacuum or multiple-effect evaporation concentration.
The integrated process retracting device of spent acid film in a kind of production process of titanium pigment, includes the first filter, and the outlet of the first filter is connected with crystallization apparatus, and the outlet of crystallization apparatus is connected with the second filter, and the per-meate side of the second filter is connected with NF membrane.
The entrance of the first described filter is connected to prefilter.
The first described filter is to separate film；Described separation film is ceramic membrane；The average pore size of ceramic membrane ranges for 0.02～0.5 μm.
The entrance of the first described filter is also associated with spent acid storage tank.
The second described filter is disk filter, and filter precision is 5～100 μm.
Also including the 3rd filter in described device, it is for carrying out solid-liquid separation to the metatitanic acid in the concentrated solution of the first filter；3rd filter is connected with the side that retains of spent acid storage tank or the first filter；3rd filter is flame filter press.
Described crystallization apparatus is selected from equipment of crystallisation by cooling or concentration and crystallization device.
The per-meate side of NF membrane is also attached to enrichment facility.
Beneficial effect
In this patent technique, start with from the ferrous sulfate removed spent acid, by by integrated to the technique such as freezing and crystallizing, disk filtration and the membrane technology such as ceramic membrane, NF membrane, reach the purpose of resource in concentrating waste acid better, reuse spent acid.There is obvious advance, compared with traditional concentration and neutralization precipitation technique and existing membrane technology process spent acid technique, there is following superiority:
1, technique scheme is adopted, this utility model obtains following beneficial effect: this utility model provides a kind of titanium pigment waste acid membrane technology and processes recovery process, combination by freezing and crystallizing and integration technique of membrane, make the ferrous sulfate concentration in spent acid drop to below 1g/L, substantially increase the compressible concentration of sulphuric acid.
2, compared with traditional concentration and neutralization precipitation technique: the spent acid that in this utility model, chilled separation and NF membrane purified treatment are crossed will not produce ferrous sulfate monohydrate salt-pepper noise when concentration, thus the concentration of sulphuric acid directly can be concentrated to about 70% once.Without as the technique needing substep concentration, ripening to remove ferrous sulfate monohydrate crystallization in traditional concentration technology, simplify concentration technology, need when saving concentration to consume more energy.More need not consuming substantial amounts of Calx, the substantial amounts of GYPSUM RUBRUM slag of output as neutralization precipitation method simultaneously, both provide cost savings expenditure, and be conducive to again environmental protection, also recyclable sulphuric acid therein, ferrous sulfate and high-quality water, create good economic benefit.
3, compared with processing spent acid with existing membrane technology: first ceramic membrane technique and prefilter are combined recovery metatitanic acid, improve the recovering effect of metatitanic acid, decrease blocking and the infringement of ceramic membrane passage.Secondly ceramic membrane technique and disk filtration technique are integrated and carry out solid-liquid separation, clarified the crystalline mother solution after freezing and crystallizing to greatest extent, be smoothed out with having ensured nanofiltration process.It is finally integrate refrigerating process and nanofiltration technique to carry out the removal of ferrous sulfate in spent acid, significantly reduces the concentration of ferrous sulfate in spent acid, make the sulphuric acid after purification directly concentrate the sulphuric acid (70%) into higher concentration.
What is more important, owing to this technology is integrated with membrane technology for basic technology, equipment volume is little, and floor space is little, and automaticity is high, thus versatility is stronger, it is easy to industrialization promotion.
Accompanying drawing explanation
Fig. 1 is the structure drawing of device that this utility model adopts.
Wherein, 1, prefilter；2, spent acid storage tank；3, the first filter；4, the 3rd filter；5, crystallization apparatus；6, the second filter；7, pans；8, NF membrane；9, enrichment facility.
Detailed description of the invention
Below by detailed description of the invention, this utility model is described in further detail.It will be apparent, however, to one skilled in the art, that the following example is merely to illustrate this utility model, and should not be regarded as limiting scope of the present utility model.Unreceipted concrete technology or condition person in embodiment, technology or condition described by the document in this area or carry out according to product description.Agents useful for same or the unreceipted production firm person of instrument, be can pass through city available from conventional products.
Approximate language used herein can be used for modifying the statement of any quantity in entire disclosure and claims, and it can be changed being not resulted in allowance when its relevant basic function changes.Therefore, such as term " about " value modified is not limited to specified exact value.In at least some cases, approximate language can be corresponding with the precision of the instrument for measuring this value.Unless indicated otherwise in context or statement, otherwise range limit can be combined and/or exchange, and this scope is confirmed as and includes all subranges contained herein.Except indicating in operation embodiment or elsewhere, the numeral of the amount of all expression compositions that uses in specification and claims, reaction condition etc. or express and shall be construed as the modification being subject to word " about " in all cases.The numerical value as range limit not only including clearly listing should be interpreted as using the value of range format expression in a flexible way, but also include all single numerical value or the subinterval that are encompassed within the scope of this, be expressly recited out just as each numerical value and subinterval.Such as, the concentration range of " about 0.1% to about 5% " should be understood to not only to include the concentration of about 0.1% to about 5% clearly listed, also include single concentration in institute's how (as, 1%, 2%, 3% and 4%) and subinterval (such as, 0.1% to 0.5%, 1% to 2.2%, 3.3% to 4.4%).It should be understood that it can be joined directly together with other elements or be indirectly connected to other elements, and is inserted with element between them when an element was mentioned with another element " connection ".Unless there are clearly contrary explanation, otherwise term " including " and " having " are interpreted as stating and comprise listed element, and non-excluded arbitrarily other elements.
Word used herein " includes ", " comprising ", " having " or its any other variant are intended to including of non-exclusionism.Such as, it is not necessarily limited by those key elements including listing the technique of key element, method, article or equipment, but can be included other and be not expressly set out or belong to the key element that this technique, method, article or equipment are intrinsic.
" removal " in this specification, not only includes the situation removing target substance completely, also includes part and removes the situation of (reducing this amount of substance)." purification " in this specification, including removing arbitrary or specific impurity.
Percentage ratio described in this utility model refers to mass percent when without special instruction.
Spent acid targeted in this utility model mainly comes from Titanium White Production By Sulfuric Acid Process process, one produced by leaf filter after being hydrolyzed washes suction piece water, wherein, sulfur acid is typically in 15～28%(or 20～25%), ferrous sulfate 6%～22%(or 10～15%).The iron salt of such high concentration produces significantly high osmotic pressure, as directly with nanofiltration membrane, generally required and be operated (> 5MPa with high pressure), and the existing the highest operation pressure of common NF membrane i.e. 4.2MPa, thus tend not to meet industrialized production.
In method provided by the utility model, mainly need first spent acid to be carried out solid-liquid separation, make the separated reuse of metatitanic acid therein, again the filtrate obtained is carried out freezing and crystallizing, so that most ferrous sulfate crystallization, can also concentrate by the mode of evaporation, and then also be able to make ferrous sulfate crystallization precipitate out；Being removed by the ferrous sulfate precipitated out by the mode of solid-liquid separation, the content of the ferrous sulfate in filtrate is greatly reduced, and then the mode of nanofiltration can be adopted to be filtered, it is achieved degree of depth sulfuric acid is ferrous, it is thus achieved that the sulphuric acid of higher degree again.
For metatitanic acid being carried out solid-liquid separation removal and the solid-liquid separation after ferrous sulfate crystallization precipitates out, it is possible to the method adopting existing solid-liquid separation, about solid-liquid separating method, it does not have be particularly limited to.As the method that concrete solid-liquid separation processes, centrifugation mode, expression separation mode, filter type, floating separate mode, settlement separate mode can be enumerated.As centrifugation mode, horizontal continuous centrifuge can be illustrated, separate board-like centrifugal separator, filter centrifugal, as filter type, micro-filtration membrane, ultrafilter membrane, band filter, belt press, flypress, precoat filter, pressure filter can be illustrated, as floating separate mode, it is possible to illustrate the segregation apparatus that floats continuously, as settlement separate mode, the settlement separate machine of coagulation, rapid settlement separate machine etc. can be illustrated, but be not particularly limited in above-mentioned any one.Solid-liquid separation method, the mode of micro-filtration membrane or ultrafilter membrane is preferably adopted to be filtered separating, for micro-filtration membrane of the present utility model to be average pore size the be film of 0.05 μm～5 μm, ultrafilter membrane is molecular cut off be 1000～200000 film or average pore size scope be 0.005～0.05 μm.At this, owing to the aperture of ultrafilter membrane is too small and be difficult to measure the aperture on film surface with ultramicroscope etc., so replacing average pore size to be used as the index of pore size by the value being called molecular cut off.About molecular cut off, as known to those skilled in the art: " will be transverse axis with molecular weight solute, prevention rate for the longitudinal axis, the curve that data are drawn is called molecular cut off curve.And the molecular weight that prevention rate is 90% is called the molecular cut off of film ".Material as these micro-filtration membrane or ultrafilter membrane, as long as being capable of removing the separation purpose of the ferrous sulfate of the metatitanic acid of above-mentioned spent acid or crystallization, it is not particularly limited, can enumerate: the organic materials such as cellulose, cellulose esters, polysulfones, polyether sulfone, polrvinyl chloride, chloropropene, polyolefin, polyvinyl alcohol, polymethyl methacrylate, polyvinylidene fluoride, politef, or the inorganic material such as metal or pottery such as rustless steel.The material of micro-filtration membrane or ultrafilter membrane can consider that the character of hydrolysate or operating cost suitably select, and considers from acid resistance and durability, it is preferred to adopt ceramic material.Needing a precision before entering ceramic membrane is the prefilter of below 1mm, to remove oarse-grained solid.
In one embodiment, metatitanic acid in spent acid is filtered removing by the mode (such as ceramic membrane) adopting membrance separation, the average pore size of ceramic membrane ranges for 0.02～0.5 μm, operation pressure is 0.1～0.5MPa, membrane structure is external-compression type or inner pressed tubulose multi-channel structure, when in the dope of ceramic membrane, the content of metatitanic acid removes filter press when reaching 150～more than 200g/L thus obtaining metatitanic acid powder body, the filtrate of sheet frame returns ceramic membrane and continues to filter clarification, all to reclaim metatitanic acid and Waste Sulfuric Acid.
In order to make ferrous sulfate crystallization, as long as the ferrous sulfate supersaturation crystallization in spent acid can be made, it is not particularly limited, the mode that can adopt freezing and crystallizing carries out (crystallization range preferably-10～0 DEG C), can also be that the mode adopting evaporation removes portion of water, reaching to make the oversaturated purpose of ferrous sulfate, the mode of evaporation is selected from multi-effect evaporator or MVR evaporation etc..
For the spent acid containing ferrous sulfate crystallization, it is be filtered by disk filter in one preferred embodiment, the crystalline solid of the overwhelming majority to be removed, in process, disk filter adopts the form that vacuum takes out negative pressure to filter, vacuum 0.01～0.1MPa, the precision of filter is 5～100 μm, preferably with separation film, the filtrate of disk filter is carried out fine straining thoroughly to remove micro crystal float again, and when separating ferrous sulfate crystal concentration 15～20% in the dope of film, return disk filter, thoroughly to reclaim ferrous sulfate crystal and spent acid.
It follows that adopt NF membrane to carry out degree of depth sulfuric acid ferrous salt, the running temperature controlling NF membrane is 15～40 DEG C, and pressure is 2～8MPa.Cycles of concentration is 2～6 times.Concentration sent to by NF membrane clear liquid, and the dope of NF membrane turns again to freezing cleaning procedure.The specification of NF membrane used is under 4MPa, and to the magnesium sulfate rejection rate of 2g/L more than 96%, the concentration of acid corrosion-resistant is 5～30%.In NF membrane permeate, the content of ferrous sulfate obtains substantial amounts of reduction, furthermore it is also possible to the permeate of nanofiltration is concentrated further, and the sulphuric acid higher to obtain concentration.The concentration of spent acid adopts vacuum or multiple-effect evaporation concentration, obtains the sulphuric acid that ultimate density is 70%, for being used as complex acid in acidolysis process.
Based on above-mentioned method, this utility model additionally provides a kind of Waste acid treating device, as shown in Figure 1, the outlet of prefilter 1 is connected with spent acid storage tank 2, the effect of prefilter 1 is that spent acid carries out the oarse-grained filtering and impurity removing of preliminary removal, spent acid storage tank 2 is for storing the acid solution through tentatively filtering, and the outlet of spent acid storage tank 2 is connected with the first filter 3, and the effect of the first filter 3 is that metatitanic acid therein is easily separated removal；Additionally, the 3rd filter 4 can also be included in a device, its effect is that the concentrated solution obtained in the first filter 3 is carried out concentrating and separating further, such as when the first filter 3 employing is purpose ceramic-film filter, adopt flame filter press as the 3rd filter 4, therefore, what the 3rd filter 4 both can be connected to the first filter 3 retains side, it is also possible to be directly connected on spent acid storage tank 2.nullThe per-meate side of the first filter 3 is connected with crystallization apparatus 5，The effect of crystallization apparatus 5 is to make ferrous sulfate carry out crystallization，It can adopt the one in equipment of crystallisation by cooling or concentration and crystallization device or two kinds，The outlet of crystallization apparatus 5 is connected with the second filter 6，The effect of the second filter 6 is that ferrous sulfate solid therein is carried out solid-liquid separation，Obtain passing through acid solution，The per-meate side of the second filter 6 passes sequentially through after pans 7 connect again and is connected with NF membrane 8，The effect of NF membrane 8 is by concentration sulfuric acid ferrous salt，The retaining side and can also be connected with crystallization apparatus 5 of NF membrane 8，So that the ferrous sulfate in nanofiltration concentrated solution obtains Crystallization Separation further and makes the acid in concentrated solution obtain utilizing into lower，The per-meate side of NF membrane 8 can also be connected with enrichment facility 9，To realize the acid solution after purifying is concentrated further.
Shown in the main component table composed as follows of the spent acid adopted in following example:
Spent acid composition (g/L)
Embodiment 1
After spent acid first passes through prefilter 1, enter in spent acid storage tank 2, it is re-fed in the first filter 3 and carries out solid-liquid separation, it adopts aperture to be 0.2 μm of ceramic membrane, when the metatitanic acid content of the dope of ceramic membrane reaches 200g/L, filter press is adopted by the 3rd filter 4() reclaim metatitanic acid, the filtrate of filter press returns in spent acid storage tank 2 and again reclaims spent acid therein with ceramic membrane.
Spent acid clear liquid after ceramic membrane filter enters in crystallization apparatus 5, control the temperature respectively-6 DEG C ,-2 DEG C of freezing and crystallizing, 2 DEG C.Crystal mixed slurry after freezing and crystallizing is carried out vacuum suction filter by the second filter (disk filter) 6, and control vacuum is 0.07MPa, obtains ferrous sulfate crystal and crystalline mother solution.After mother solution to be crystallized squeezes into pans 7, it is driven into NF membrane 8 and carries out degree of depth removal ferrous sulfate, the cycles of concentration controlling NF membrane is 4 times, operation pressure is 4MPa, and filtration temperature is 20 DEG C, obtains NF membrane clear liquid and NF membrane dope, in NF membrane dope, ferrous sulfate concentration reaches 176g/L, returning to and continue in crystallization apparatus 5 to reclaim ferrous sulfate crystal, NF membrane clear liquid is then got to a step concentration in enrichment facility 9 and is obtained 70% sulphuric acid, obtains acid distilled water simultaneously.
Feed liquid composition situation under different operating conditions is as follows:
Reference examples 1
It is distinctive in that with embodiment 1: do not add the step of crystallisation by cooling.
After spent acid first passes through prefilter 1, enter in spent acid storage tank 2, it is re-fed in the first filter 3 and carries out solid-liquid separation, it adopts aperture to be 0.2 μm of ceramic membrane, when the metatitanic acid content of the dope of ceramic membrane reaches 200g/L, filter press is adopted by the 3rd filter 4() reclaim metatitanic acid, the filtrate of filter press returns in spent acid storage tank 2 and again reclaims spent acid therein with ceramic membrane.
Spent acid clear liquid after ceramic membrane filter enters into NF membrane 8 and carries out degree of depth removal ferrous sulfate, operation pressure is 4MPa, the cycles of concentration of NF membrane is only capable of reaching 1.1～1.3 times, filtration temperature is 20 DEG C, obtaining NF membrane clear liquid and NF membrane dope, in NF membrane dope, ferrous sulfate concentration reaches 120g/L, and NF membrane clear liquid is then got to a step concentration in enrichment facility 9 and obtained 70% sulphuric acid, obtaining acid distilled water, reclaiming the composition of the main component in sulphuric acid is: FeSO simultaneously48.2g/L、Al2(SO4)31.7g/L、H2SO470%。
Claims (9)
1. the integrated process retracting device of spent acid film in a production process of titanium pigment, it is characterized in that: include the first filter (3), the outlet of the first filter (3) is connected with crystallization apparatus (5), the outlet of crystallization apparatus (5) is connected with the second filter (6), and the per-meate side of the second filter (6) is connected with NF membrane (8).
2. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: the entrance of described the first filter (3) is connected to prefilter (1).
3. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: described the first filter (3) is to separate film；Described separation film is ceramic membrane；The average pore size of ceramic membrane ranges for 0.02～0.5 μm.
4. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: the entrance of described the first filter (3) is also associated with spent acid storage tank (2).
5. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: described the second filter (6) is disk filter, and filter precision is 5～100 μm.
6. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterized in that: also include the 3rd filter (4) in described device, it is for carrying out solid-liquid separation to the metatitanic acid in the concentrated solution of the first filter (3)；3rd filter (4) is connected with the side that retains of spent acid storage tank (2) or the first filter (3)；3rd filter (4) is flame filter press.
7. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: described crystallization apparatus (5) is selected from equipment of crystallisation by cooling or concentration and crystallization device.
8. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: the per-meate side of NF membrane (8) is also attached to enrichment facility (9).
9. the integrated process retracting device of spent acid film in production process of titanium pigment according to claim 1, it is characterised in that: NF membrane (8) is under 4MPa, to the magnesium sulfate rejection rate of 2g/L more than 96%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105439105A (en) * | 2015-12-22 | 2016-03-30 | 江苏久吾高科技股份有限公司 | Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105439105A (en) * | 2015-12-22 | 2016-03-30 | 江苏久吾高科技股份有限公司 | Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide |
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