CN207121495U - A kind of reuse means of wastewater from TiO2 factory - Google Patents
A kind of reuse means of wastewater from TiO2 factory Download PDFInfo
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- CN207121495U CN207121495U CN201720843126.4U CN201720843126U CN207121495U CN 207121495 U CN207121495 U CN 207121495U CN 201720843126 U CN201720843126 U CN 201720843126U CN 207121495 U CN207121495 U CN 207121495U
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Abstract
A kind of reuse means of wastewater from TiO2 factory is the utility model is related to, belongs to environmental technology field.Including：First solid-liquid separation unit, for carrying out separation of solid and liquid processing to waste water；Reactive tank, the filtrate side of the first solid-liquid separation unit is connected to, for carrying out precipitation reaction to filtrate；Magnesium chloride and/or calcium chloride add unit, are connected to the first solid-liquid separation unit, for adding magnesium chloride and/or calcium chloride into filtrate；Ion exchange resin, reactive tank is connected to, for carrying out ion-exchange removal of impurity ion processing to the clear liquid in reactive tank.The utility model advantage is：1. operating procedure is simple；2. treatment effeciency is high, energy consumption is low；3. post processing waste water is changed into chlor-alkali refined brine raw material, the combination of chloride process titanium dioxide powder craft and chloralkali process is realized.
Description
Technical field
A kind of reuse means of wastewater from TiO2 factory is the utility model is related to, belongs to environmental technology field.
Background technology
Titanium dioxide is considered as a kind of current best Chinese white of performance in the world, is widely used in coating, plastics, makes
The industry such as paper, printing-ink, chemical fibre, rubber, cosmetics.The production capacity of titanium dioxide indirectly imply that a national GDP degree.
Production titanium dioxide mainly has two methods of sulfuric acid process and chloridising at present.Sulfuric acid process long flow path, can only with
Have a rest based on operation, wet bench, sulfuric acid, water consumption are high, and waste and accessory substance are more, big for environment pollution.And chloridising both saves
Environmental protection again, under current Environmental Protection in China pressure, chloridising is gradually built up, and will progressively substitute sulfuric acid process turns into main technique.
Chlorination process main flow is three big processes of chlorination, oxidation and post processing.
A, chlorination：Titanium material is mixed with reducing agent and generates titanium tetrachloride with reaction under chlorine high temperature, through rectification and purification, is obtained
To refined titanium tetrachloride；
B, aoxidize：Titanium tetrachloride is preheated to be evaporated to gas, and rapid oxidation produces in oxidation furnace under 1800 DEG C of high temperature
Solid titanium dioxide, rapid cooling obtain crude titanium dioxide；
C, post-process：Crude titanium dioxide is dispersed through being beaten, classification, surface treatment, washing, spray drying, air-flow is sanded
The processes such as crushing prepare finished product.
Produced after the washing of titanium dioxide surface-coating in the post processing waste water of water and mainly contain a certain amount of sodium chloride, and contained
The materials such as micro titanium dioxide, sodium metasilicate, sodium metaaluminate, calgon.Directly discharge causes the loss of titanium dioxide product simultaneously
Pollute environment.
Domestic and international processing method mainly has following two at present.1st, outdoor sedimentation basin is established, is reclaimed by natural subsidence low
Quality titanium dioxide, liquid deliver to Sewage Disposal or natural evaporation；2nd, titanium dioxide is reclaimed after pre-processing, will using reverse osmosis technology
3-5 times or so of Waste water concentrating, concentrate are sent into crystallizing evaporator and are evaporated, make solid sodium chloride salt and be used for some fields
（Such as snow melt salt）, reuse after steam condensation.But many shortcomings be present in two methods, outdoor sedimentation basin floor space in method 1
Greatly and settling efficiency is low, and the titanium dioxide of recovery reduces because long-time settles quality, is made in waste water containing discharge of poisonous waste
Into pollution.Solid salt is flashed to using crystallizing evaporator in method 2, although solving environmental problem caused by discharge, energy consumption
Greatly, processing cost is too high.And all do not realize that resource makes full use of effectively in two methods.
Utility model content
Mainly based on evaporative crystallization, the utility model purpose is to provide a kind of the sharp again of wastewater from TiO2 factory existing process
With device, the device can effectively remove the impurity category ion in solution, obtain refined sodium chloride solution, meet chlor-alkali salt solution
Raw material standard.
A kind of reuse method of wastewater from TiO2 factory, comprises the following steps：
1st step, the waste water in chlorination legal system titanium dioxide technique is passed through into separation of solid and liquid；
2nd step, desiliconizing agent and/or aluminium removal are added in the waste water that the 1st step obtains, carry out precipitation reaction, it is heavy by what is obtained
Form sediment and carry out separation of solid and liquid removal；
3rd step, the waste water that the 2nd step obtains after pH is adjusted to 1~6 be sent into ion exchange resin in go the removal of impurity from
Son, obtain refined NaCl salt solution.
In the 1st described step, waste water comes from chlorination legal system titanium dioxide technique produces water after the washing of titanium dioxide surface-coating.
In the 2nd described step, desiliconizing agent and/or aluminium removal are selected from magnesium chloride and/or calcium chloride.
In the 2nd described step, separation of solid and liquid is using sedimentation separation or is separated by filtration.
In the 3rd described step, ion exchange resin be selected from cationic ion-exchange resin, anion exchange resin, amphoteric resin,
Chelating resin.
In the 3rd described step, obtained refined NaCl salt solution feeding ion film caustic soda workshop section makees raw material.
A kind of reuse means of wastewater from TiO2 factory, including：
First solid-liquid separation unit, for carrying out separation of solid and liquid processing to waste water；
Reactive tank, the filtrate side of the first solid-liquid separation unit is connected to, for carrying out precipitation reaction to filtrate；
Magnesium chloride and/or calcium chloride add unit, the first solid-liquid separation unit are connected to, for adding chlorination into filtrate
Magnesium and/or calcium chloride；
Ion exchange resin, be connected to reactive tank, in reactive tank clear liquid carry out the ion-exchange removal of impurity from
Subprocessing.
Also include the second solid-liquid separation unit, be connected to reactive tank, for carrying out solid-liquid point to the waste water in reactive tank
From processing；The filtrate side of second solid-liquid separation unit is connected with ion exchange resin.
Also include ion film caustic soda electrolytic cell, be connected to the outlet of ion exchange resin, for the NaCl salt to obtaining
Water is electrolysed.
Also include pH adjustment units, the pH for the waste water to entering ion exchange resin is adjusted.
Beneficial effect
1. processing speed is fast, turns waste into wealth and avoid environmental pollution；2. without evaporative crystallization, a large amount of energy consumptions are saved；3.
The refined sodium chloride solution arrived is as chlor-alkali raw material.
Brief description of the drawings
Fig. 1 is the flow chart of method of reutilizing wastewater provided by the utility model；
Fig. 2 is recycling equipment structure chart provided by the utility model；
Fig. 3 is another equipment structure chart provided by the utility model.
Wherein, the 1, first solid-liquid separation unit；2nd, reactive tank；3rd, magnesium chloride and/or calcium chloride add unit；4th, second is solid
Liquid separative element；5th, ion exchange resin；6th, electric dialyzator；7th, pH adjustment units；8th, ion film caustic soda electrolytic cell.
Embodiment
The utility model wastewater source to be dealt with titanium dioxide surface-coating in chlorination legal system titanium dioxide technique washs
After produce water, its water quality situation is：PH is in 7.5~10.5, Ca2+In 10~50ppm, Na+Exist in 500~5000ppm, Al
230ppm, Si are in 0.5~20ppm, Cl-In 500~6000ppm, COD is in 4~50ppm, TDS in 1000~10000 ppm.
The utility model use handling process, be that waste water is first subjected to separation of solid and liquid, by the titanium dioxide wherein contained,
Hydrated titanium dioxide etc. is isolated, recycling.Also include silicate ion and meta-aluminic acid radical ion in remaining production water
Deng can be removed it by adding desiliconizing agent and/or aluminium removal, can be calcium chloride used herein of desiliconizing agent, aluminium removal
Or magnesium chloride, by taking magnesium chloride as an example, its except silicon mechanism be magnesia mixture in the basic conditions, in water part aquation formed magnesium hydroxide
Complicated molecule structure, part magnesium hydroxide is dissolved in solution, thus form around by OH-The positively charged of encirclement is answered
Miscellaneous colloidal particle, ion exchange can be carried out with magnesia colloidal particle with silicic acid cereal existing for different shape in water, formed
The magnesium silicate cereal to find it difficult to learn, while also there occurs the cohesion of siliceous colloid and the generation of calcium silicates.Calcium chloride or magnesium chloride plus
The mole entered is 1~2 times of silicate ion and meta-aluminic acid radical ion molar concentration.
Next, the colloidal precipitation of generation can be removed by way of separation of solid and liquid.
After obtaining except the clear liquid after precipitation, its pH is adjusted to 1~6 or so, is re-fed into ion exchange resin progress
Processing, removes foreign ion therein, and mainly except aluminium ion, the NaCl salt solution after being refined, it meets ionic membrane burning
The feed needs of alkali.
Except aluminium ion all reaches chlor-alkali raw material standard in heavy metal ion after chemical agent adds, aluminium ion concentration is down to
1-5ppm.The utility model method is characterised by：Ion exchange resin includes but is not limited to cationic ion-exchange resin, anion
Exchanger resin, amphoteric resin, chelating resin.Aluminium ion concentration is down to 0.01-0.5ppm after ion exchange resin adsorbs.
The solid-liquid separation method that the above method uses, is not particularly limited.The method handled as specific separation of solid and liquid,
Centrifugation mode, expression separation mode, filter type, floating separate mode, sedimentation separation mode can be enumerated.As centrifugation point
From mode, horizontal continuous centrifuge, the board-like centrifugal separator of separation, filter centrifugal, tall building Pu Lesi types can be illustrated and surpassed
Centrifugal separator, as filter type, band filter, belt press, flypress, precoat filter, filter press can be illustrated,
As floating separate mode, continuous floating separator can be illustrated, as sedimentation separation mode, aggegation sedimentation point can be illustrated
Disembark, rapid sedimentation separation machine etc., but be not particularly limited in above-mentioned any one.
Above-mentioned ion exchange resin can be selected from cationic ion-exchange resin, anion exchange resin, amphoteric resin, chelating
Resin.
In one embodiment, obtained refined NaCl salt solution can be sent into during ion film caustic soda and be electrolysed
Processing, can obtain sodium hydroxide.
In one embodiment, in the 2nd described step, before desiliconizing agent and/or aluminium removal is added, electrodialysis is passed through
Waste water is concentrated, dope enters back into subsequent step., first will with electrodialysis methods after waste water carries out separation of solid and liquid first
It is concentrated, and improves NaCl concentration, because NaCl can be compressed the electric double layer of colloidal solid, to reduce carried charge, from
And the colloidal solid in water is contacted with each other, and adsorb, be bonded into big particle and settle.
Based on above-mentioned method, the apparatus structure of use is as shown in Figure 2.
First solid-liquid separation unit 1, for carrying out separation of solid and liquid processing to waste water；
Reactive tank 2, the filtrate side of the first solid-liquid separation unit 1 is connected to, for carrying out precipitation reaction to filtrate；
Magnesium chloride and/or calcium chloride add unit 3, the first solid-liquid separation unit 1 are connected to, for adding chlorine into filtrate
Change magnesium and/or calcium chloride；
Ion exchange resin 5, reactive tank 2 is connected to, for carrying out the ion-exchange removal of impurity to the clear liquid in reactive tank 2
Ion processing.
Also include the second solid-liquid separation unit 4, be connected to reactive tank 2, for carrying out solid-liquid to the waste water in reactive tank 2
Separating treatment；The filtrate side of second solid-liquid separation unit 4 is connected with ion exchange resin 5.
Also include ion film caustic soda electrolytic cell 8, be connected to the outlet of ion exchange resin 5, for the NaCl to obtaining
Salt solution is electrolysed.
Also include electric dialyzator 6, be connected to the filtrate side of the first solid-liquid separation unit 1, for being concentrated to filtrate,
The dope side of electric dialyzator 5 is connected with reactive tank 2.
Also include pH adjustment units 7, be connected to the entrance of ion exchange resin 5, for entering ion exchange resin 5
The pH of waste water be adjusted.
Waste water quality is as follows used by following examples：
Embodiment 1
Waste water is filtered to remove SS Solid contents by filter paper, then adds appropriate magnesium chloride（With magnesium molar concentration meter, with silicon
Acid ion is identical with the molar concentration of meta-aluminic acid root）, natural subsidence takes supernatant to detect after reaction, measures Si contents
9.5ppm, Al content 11ppm, Mg content 4.5ppm, other heavy metals are not detected by.
The pH of supernatant is adjusted to 4 and then after cationic exchange resin adsorption, measures Si contents 3.8ppm, Al
Content 0.58ppm, Mg content 0.9ppm, other heavy metals are not detected by.
Embodiment 2
Waste water is filtered to remove SS Solid contents by filter paper, then adds excessive magnesium chloride（With magnesium molar concentration meter, add
Amount is 1.3 times of the molar concentration of silicate ion and meta-aluminic acid root）, natural subsidence takes supernatant to detect after reaction, measures
Si content 8.8ppm, Al content 14.4ppm, Mg content 7.7ppm, other heavy metals are not detected by.
Supernatant measures Si content 3.8ppm, Al content 0.48ppm, Mg content after cationic exchange resin adsorption
2.4ppm, other heavy metals are not detected by.
Embodiment 3
Waste water is filtered to remove SS Solid contents by filter paper, then adds appropriate calcium chloride（With magnesium molar concentration meter, with silicon
Acid ion is identical with the molar concentration of meta-aluminic acid root）, natural subsidence takes supernatant to detect after reaction, measures Si contents
13.4ppm, Al content 8ppm, Ga content 2.4ppm, other heavy metals are not detected by.
Supernatant measures Si content 7.6ppm, Al content 0.32ppm, Ga content after cationic exchange resin adsorption
1.3ppm, other heavy metals are not detected by.
Embodiment 4
Waste water is filtered to remove SS Solid contents by filter paper, then adds excessive calcium chloride（With magnesium molar concentration meter, add
Amount is 1.3 times of the molar concentration of silicate ion and meta-aluminic acid root）, natural subsidence takes supernatant to detect after reaction, measures
Si content 12.9ppm, Al content 12.6ppm, Ga content 12.5ppm, other heavy metals are not detected by.
Supernatant measures Si content 3.5ppm, Al content 0.15ppm, Ga content after cationic exchange resin adsorption
2.2ppm, other heavy metals are not detected by.
Embodiment 5
Difference with embodiment 4 is, after SS Solid contents are filtered out, filtrate is filtered by electrodialysis.
Waste water is filtered to remove SS Solid contents by filter paper, and concentration operation, electrodialysis plant operation electricity are carried out using electrodialysis
Press as 120V, electric current 1.5A, feed pressure 0.01MPa.Excessive calcium chloride is added in electrodialytic concentrated water（It is dense with magnesium mole
Degree meter, addition is 1.3 times of the molar concentration of silicate ion and meta-aluminic acid root）, natural subsidence takes supernatant after reaction
Detection, measures Si content 2.2ppm, Al content 3.1ppm, Ga content 1.1ppm, other heavy metals are not detected by.
Supernatant measures Si content 0.8ppm, Al content 0.02ppm, Ga content after cationic exchange resin adsorption
1ppm, other heavy metals are not detected by.
Claims (4)
- A kind of 1. reuse means of wastewater from TiO2 factory, it is characterised in that including：First solid-liquid separation unit（1）, for carrying out separation of solid and liquid processing to waste water；Reactive tank（2）, it is connected to the first solid-liquid separation unit（1）Filtrate side, for filtrate carry out precipitation reaction；Magnesium chloride and/or calcium chloride add unit（3）, it is connected to the first solid-liquid separation unit（1）, for adding chlorine into filtrate Change magnesium and/or calcium chloride；Ion exchange resin（5）, it is connected to reactive tank（2）, for reactive tank（2）In clear liquid carry out ion-exchange removal of impurities Matter ion processing.
- 2. the reuse means of wastewater from TiO2 factory according to claim 1, it is characterised in that also include the second solid-liquid point From unit（4）, it is connected to reactive tank（2）, for reactive tank（2）In waste water carry out separation of solid and liquid processing；Second solid-liquid point From unit（4）Filtrate side and ion exchange resin（5）Connection.
- 3. the reuse means of wastewater from TiO2 factory according to claim 1, it is characterised in that also include ion film caustic soda Electrolytic cell（8）, it is connected to ion exchange resin（5）Outlet, for being electrolysed to obtained NaCl salt solution.
- 4. the reuse means of wastewater from TiO2 factory according to claim 1, it is characterised in that also include pH adjustment units （7）, it is connected to ion exchange resin（5）Entrance, for into ion exchange resin（5）The pH of waste water be adjusted.
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| CN201720843126.4U CN207121495U (en) | 2017-07-12 | 2017-07-12 | A kind of reuse means of wastewater from TiO2 factory |
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| CN201720843126.4U CN207121495U (en) | 2017-07-12 | 2017-07-12 | A kind of reuse means of wastewater from TiO2 factory |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108328780A (en) * | 2017-07-12 | 2018-07-27 | 江苏久吾高科技股份有限公司 | A kind of reuse method and device of wastewater from TiO2 factory |
| CN108328808A (en) * | 2018-04-20 | 2018-07-27 | 宜宾天原海丰和泰有限公司 | A kind of titanium chloride slag filtrate film integrated processing method and device |
-
2017
- 2017-07-12 CN CN201720843126.4U patent/CN207121495U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108328780A (en) * | 2017-07-12 | 2018-07-27 | 江苏久吾高科技股份有限公司 | A kind of reuse method and device of wastewater from TiO2 factory |
| CN108328808A (en) * | 2018-04-20 | 2018-07-27 | 宜宾天原海丰和泰有限公司 | A kind of titanium chloride slag filtrate film integrated processing method and device |
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