CN103708570A - Method for recycling inorganic salts in inorganic pigment waste water - Google Patents
Method for recycling inorganic salts in inorganic pigment waste water Download PDFInfo
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- CN103708570A CN103708570A CN201310749437.0A CN201310749437A CN103708570A CN 103708570 A CN103708570 A CN 103708570A CN 201310749437 A CN201310749437 A CN 201310749437A CN 103708570 A CN103708570 A CN 103708570A
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Abstract
The invention provides a method for recycling inorganic salts in inorganic pigment waste water. The method comprises the steps of atomizing salt-containing pigment waste water into droplets in a mesoscopic state by a two-fluid atomizer, wherein the particle size of the droplets is 30-100mum; heating air by use of energy provided by a trough type solar thermal collector; carrying out convective mixing on hot air provided by the trough type solar thermal collector and the atomized droplets in a binary convection tower, so as to perform heat exchange; separating crystallized particles adhered on the wall of the convection tower and on the bottom of the convection tower from the convection tower by a scraper blade and a propeller respectively, and feeding the crystallized particles at the bottom of the convection tower to a crystallized salt collector through the centrifugal effect of the propeller. The method has the beneficial effects that no contact with the inner wall of the device tower exists during atomization, and the problems of scaling and equipment corrosion can be greatly reduced; a trough type solar panel and a vacuum heat collector are utilized to collect the solar energy efficiently, and the heat utilization rate can reach 56%; natural heat energy carries out heat exchange with the droplets, a large number of existing sources are saved and no environment pollution is caused.
Description
Technical field
The present invention relates to belong to resource and environment technology, particularly a kind of method that reclaims inorganic salt in mineral dye waste water.
Background technology
Mineral dye is the important chemical color that is widely used in the fields such as coating, rubber, leather, yet the generation at the production process middle and high concentration brine waste of traditional technology is the bottleneck problem of restriction this area Sustainable development, realizes the inevitable requirement that cleaner production and resource circulation utilization are this traditional high pollution industries.Exploitation and the application of the gordian technique that therefore, effective processing of mineral dye production process middle and high concentration brine waste and solubility salt are recycled are just more and more important.
Mineral dye is heat-resisting owing to having, fast light, strong coloring force, the advantage such as cheap and easy to get, in the industries such as coating, rubber, ink, occupies critical role, is the industrial pigment that a kind of usage quantity is large, have wide range of applications.It is reported, domestic year market demand of titanium dioxide is 1,500,000 tons, and the year market demand of lead-chrome yellow is 40,000 tons.But along with the enhancing of people's environmental consciousness, the development of pigment industry to a large amount of consumption of natural resource, cause the traditional industry of serious environmental pollution to propose new requirement.The dense salt wastewater discharge producing in mineral dye production process is large, both contaminate environment, and this is also a kind of waste of resource simultaneously.Take lead-chrome yellow as example, and every production 1t product, produce 20t brine waste, and wherein in waste water per ton, contains SODIUMNITRATE 50kg.
In inorganic yellow pigment, chrome yellow owing to thering is lovely luster, tinting strength, opacifying power is high and the advantage such as acidproof, resistance to solvent, producing always and use in occupy critical role.But there is NaNO in its production and application
3the processing problem of dense salt waste water and the problem of environmental pollution of heavy metal lead and chromium.Lead-chrome yellow pigment is mainly formed by Sodium chromate and lead nitrate reaction precipitation, and the SODIUMNITRATE that reaction generates is discharged with water.Correlative study data show, the SODIUMNITRATE of the about 500kg of the plumbous chrome pigment average generation of every manufacture 1t, and reclaim these SODIUMNITRATE needs a large amount of energy, lack economically feasibility, discharge of wastewater is all used as by manufacturing enterprise both at home and abroad, has not only wasted resource, and the total nitrogen in waste water is also very high.The handling problems of these waste water also just becomes Research Challenges and the focus in lead-chrome yellow pigment cleaner production field.
The SODIUMNITRATE waste water of the high density that lead-chrome yellow pigment production is produced is processed recovery, not only has good environmental benefit, also has huge economic benefit.To produce 10000t medium chrome yellow medium yellow per year, it is ten thousand yuan of 5000 * 2500=1250 that recyclable SODIUMNITRATE 5000t(is worth), the about 3000000m of saving water resource
3.And SODIUMNITRATE is the oxygenant in chromium salt production, can reduces the consumption of oxygen and caustic soda (or soda ash), and can obviously improve the transformation efficiency of oxidizing reaction; The SODIUMNITRATE reclaiming also can be reacted with lead powder, produces plumbous oxide and Sodium Nitrite, and plumbous oxide can be made lead nitrate with dilute nitric acid reaction and produce for chrome yellow, solves the pollution problem that metallic lead and nitric acid reaction generate oxynitride; The consumption that has simultaneously reduced nitric acid, Sodium Nitrite can be used as production marketing, as the starting material of other industry; The SODIUMNITRATE reclaiming also can react with Repone K production saltpetre product, for agriculture composite fertilizer etc.
Chinese blue be important blue inorganic pigment it is bright in luster, stable in properties, strong covering power, is widely used in the fine chemicals such as coating, ink.In industrial production Chinese blue process, the normal big area sheet frame pressure filter that adopts is separated with reaction medium because Chinese blue granules of pigments can, through reasons such as filter cloth and plate-and-frame filter press leakages, still contain a large amount of Chinese blue pigment in actual production in the Chinese blue waste water discharging by pigment.According to investigations, in every cubic metre of waste water, approximately contain Chinese blue pigment 400～500g, and every production 1t Chinese blue product, will produce the brine waste of 20t.If these waste water are thrown into environment, both caused environmental pollution fork to cause Chinese blue to run off; And through suitable processing, pigment is all recycled, water outlet is as clear as crystal, and economic benefit and social benefit are remarkable.
Sun power and electric energy coordination technique are to realize the powerful measure that mineral dye strong brine continuous effective depth of round utilizes.Effective processing of mineral dye strong brine is to improve the key means that membrane method unit is produced water efficiency, reduced environmental pollution, but it still lacks economical and efficient, reliable and stable treatment technology.Although and existing general embrane method reverse-osmosis treated strong brine technology can be processed the aqueous solution of saltiness below 35000mg/L, the rate of recovery of water is generally less than 50%, working pressure higher (> 6MPa), power consumption is also higher; The desalination of distillation method strong brine is processed and conventionally will be added acid or Scale inhibitors etc. to prevent from desalinating process fouling, also require to add alkali to regulate pH value, chlorine dosing control biological growth, these chemical substances and dense salinity be usually along with high density salt solution together discharges, thereby can cause thermal pollution, chemical additive to pollute to the environment in discharge waters; When the TDS of high density salt solution surpasses 70000mg/L, reverse osmosis and distillation method cannot be applied.Utilize groove type solar thermal-arrest, strong brine isolation technique can realize the zero release of strong brine, and the higher advantage of brine concentration is more obvious.But the impacts such as heliotechnics is subject to sooner or later, cloudy day, cannot set up stable temperature field and realize operation continuously.Sun power and electric energy coordination technique can overcome these shortcomings, can realize the continuous zero release of brine waste in mineral dye production process and the recycle of resource, produce fresh water simultaneously.
Summary of the invention
The present invention is directed at present the problems such as, ratio of desalinization low, power consumption large, easy fouling and culturing sludge difficulty strong to the corrodibility existing in saliferous pigment wastewater treatment technology, a kind of method that reclaims inorganic salt in mineral dye waste water has been proposed, the method can not only improve the ratio of desalinization of saliferous pigment wastewater and utilize natural energy to save a large amount of existing resources, and does not need to cultivate salt tolerant mud and in treating processes, avoided serious fouling and corrosion problem.
For achieving the above object, the technical solution used in the present invention is to provide a kind of method that reclaims inorganic salt in mineral dye waste water, and the method includes following steps:
(1) use twin fluid atomization device saliferous pigment wastewater to be atomized into the droplet of Jie's sight state, mist droplet particle size is 30～100 μ m;
(2) heat energy that uses trough type solar heat-collector to provide adds warm air, the electrically heated assistor of trough type solar heat-collector is assisted solar energy collector, the temperature providing when solar energy collector is during lower than 200 ℃, make air themperature reach 300 ℃-400 ℃, the round-the-clock warm air providing up to 300 ℃-400 ℃ of trough type solar heat-collector energy;
(3) warm air that trough type solar heat-collector provides mixes and carries out heat exchange in the inside convection current of binary convection tower with the droplet through atomization, the diameter of binary convection tower is 1-2m, be highly 2.5-4m, the top layout 3-6 of binary convection tower twin fluid atomization device, droplet through atomization is uniformly distributed in binary convection tower, 4-6 warm air dispenser arranged in the bottom of binary convection tower, guarantee that warm air is uniformly distributed in binary convection tower inside, the droplet of the warm air that trough type solar heat-collector provides and process atomization, in binary convection tower, carry out two fluid thermal exchanges.
(4) at convection tower tower wall, scraper plate is set, utilize scraper plate to clear up the salt particle accumulating on tower wall, in convection tower bottom, arrange 4-6 auto spiral oar, the crystalline particle sticking at the bottom of convection tower Ta Bi and tower is departed to convection tower by scraper plate and water screw by crystalline particle respectively, and the crystalline particle of the centrifugation of utilizing water screw at the bottom of by tower delivered in crystal salt collector.
The invention has the beneficial effects as follows:
1), in the atomization stage, because spraying gun impacts into micron-sized droplet saliferous pigment wastewater, median size, 50 microns of left and right, increases the surface free energy of droplet.When it carries out heat exchange, droplet can absorb the heat that the external world gives fast, and by moisture evaporation wherein, removes the salinity in droplet.The atomization stage is to carry out in binary convection tower inside, does not contact with the inwall of device tower, therefore can reduce in a large number fouling and corrosion plant issue.
2) utilize groove type solar plate and vacuum collector to collect sun power, can efficiently collect natural energy, heat utilization efficiency reaches 56%.Utilize natural heat energy and droplet to carry out heat exchange, saved a large amount of existing energy, can't cause environmental pollution.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of inorganic salt in recovery mineral dye waste water of the present invention.
In figure:
1. high pressure positive blower 2. regulated valve 3. groove type solar plate 4. vacuum heat collection pipes
5. spray evaporation tower 6. spraying gun 7. condensing tower 8. magnetic drive pump 9. under meters
10. air dispenser 11. airheater 12. water screw 13. scraper plate 14. crystal salt are collected mouth
Embodiment
By reference to the accompanying drawings a kind of method that reclaims inorganic salt in mineral dye waste water of the present invention is illustrated.
A kind of method that reclaims inorganic salt in mineral dye waste water of the present invention, the method includes following steps:
(1) use twin fluid atomization device saliferous pigment wastewater to be atomized into the droplet of Jie's sight state, mist droplet particle size is 30～100 μ m;
(2) heat energy that uses trough type solar heat-collector to provide adds warm air, the electrically heated assistor of trough type solar heat-collector is assisted solar energy collector, the temperature providing when solar energy collector is during lower than 200 ℃, make air themperature reach 300 ℃-400 ℃, the round-the-clock warm air providing up to 300 ℃-400 ℃ of trough type solar heat-collector energy;
(3) warm air that trough type solar heat-collector provides mixes and carries out heat exchange in the inside convection current of binary convection tower with the droplet through atomization, the diameter of binary convection tower is 1-2m, be highly 2.5-4m, the top layout 3-6 of binary convection tower twin fluid atomization device, droplet through atomization is uniformly distributed in binary convection tower, 4-6 warm air dispenser arranged in the bottom of binary convection tower, guarantee that warm air is uniformly distributed in binary convection tower inside, the droplet of the warm air that trough type solar heat-collector provides and process atomization, in binary convection tower, carry out two fluid thermal exchanges.
(4) at convection tower tower wall, scraper plate is set, utilize scraper plate to clear up the salt particle accumulating on tower wall, in convection tower bottom, arrange 4-6 auto spiral oar, the crystalline particle sticking at the bottom of convection tower Ta Bi and tower is departed to convection tower by scraper plate and water screw by crystalline particle respectively, and the crystalline particle of the centrifugation of utilizing water screw at the bottom of by tower delivered in crystal salt collector.
As shown in Figure 1, a kind of method that reclaims inorganic salt in mineral dye waste water of the present invention is achieved in that
1. use twin fluid atomization device 6 saliferous pigment wastewater to be atomized into the droplet of Jie's sight state.Mist droplet particle size is generally 30～100 μ m.Micron-sized particle contains larger surface free energy, thereby, can shorten evaporation time, and can evaporate large quantity of moisture during the moisture in droplet in evaporation.The moisture of evaporation enters condensing tower 7, and vaporize water is reclaimed.
2. use trough type solar heat-collector to provide heat energy to add warm air.Trough type solar heat-collector adopt slot type reflector 3 as condensing apparatus, contain absorber coatings valve tube 4 as heat collector.Whole solar energy collector is furnished with solar automatic tracking device and guarantees that condensing apparatus absorbs and converge abundant light.The temperature providing when solar energy collector during lower than 200 ℃, is used electric heater 11 to assist solar energy collectors, makes air themperature reach 300 ℃-400 ℃.So round-the-clock warm air providing up to 300 ℃-400 ℃ of trough type solar heat-collector energy;
3. the warm air that trough type solar heat-collector provides, sends into air by high pressure positive blower 1, mixes and carries out heat exchange in the 5 the inside convection current of binary convection tower with the droplet through atomization.High temperature air can become steam by droplet, thereby reaches desalting effect.The top layout 3-6 of binary convection tower twin fluid atomization device 6, is evenly distributed in tower through the droplet of atomization.4-6 air dispenser 10 arranged in its bottom, guarantees that warm air is uniformly distributed in tower inside.The diameter of binary convection tower 5 is 1-2m, is highly 2.5-4m.The droplet of the warm air that trough type solar heat-collector provides and process atomization, carries out two fluid thermal exchanges at binary convection tower 5.
4. utilize air as the medium of trough type solar heat-collector, it collects next sun power as thermal source, has not only saved existing resource, and environment is not almost polluted.Utilize this technology, the inorganic salt in its pigment wastewater can reach crystalline state.Its demineralising process is aloft to carry out, so do not contact less scaling, difficult to equipment generation corrosion with the inwall of device.The particle diameter of its droplet can reach Jie's sight state, therefore can make droplet rapid evaporation remove salinity, has saved a large amount of working hours.
5. utilize scraper plate 13 and water screw 12 that the crystal salt accumulating in tower is departed from crystal salt collection device.Scraper plate is cleared up tower wall under extraneous effect.Crystal salt at the bottom of tower is removed by 4-6 water screw.Crystal salt is collected mouth 14 by crystal salt and is entered next link.
Strong brine to different concns is tested, and the flow of different feeds saliferous pigment wastewater is tested.Find out optimum concn and the Best inter flux that by present method, can process saliferous pigment wastewater, according to ratio of desalinization, as index, judge.Concrete steps are: the feed rate that spraying gun is set; The intake pressure of adjusting atomizer and intake pressure, making the intake pressure of spraying gun and intake pressure ratio is 0.8.In spraying gun gas-water ratio, 0.8, enter tower hot air flowrate at 70m
3/ h, controls by under meter 9, enters tower hot air temperature at 300 ℃, and charging strong brine flow NaNO in mineral dye while being 15L/h
3can become crystalline state.
In solar energy collecting system: the warm air to the differing temps of collecting is delivered in fog system, and measure the temperature of the sun power that in one day, different time is collected.Trough type solar heat-collector adopt slot type reflector as condensing apparatus, contain absorber coatings valve tube as heat collector, whole solar energy collector is furnished with solar automatic tracking device and guarantees that condensing apparatus absorbs and converge abundant light.Concrete steps are: open high pressure positive blower 1 and solar energy equipment, and measure inlet temperature of stabilizer; Regulated valve 2 makes entering tower flow rate be controlled at certain limit.
Claims (1)
1. a method that reclaims inorganic salt in mineral dye waste water, the method includes following steps:
(1) use twin fluid atomization device saliferous pigment wastewater to be atomized into the droplet of Jie's sight state, mist droplet particle size is 30～100 μ m;
(2) heat energy that uses trough type solar heat-collector to provide adds warm air, the electrically heated assistor of trough type solar heat-collector is assisted solar energy collector, the temperature providing when solar energy collector is during lower than 200 ℃, make air themperature reach 300 ℃-400 ℃, the round-the-clock warm air providing up to 300 ℃-400 ℃ of trough type solar heat-collector energy;
(3) warm air that trough type solar heat-collector provides mixes and carries out heat exchange in the inside convection current of binary convection tower with the droplet through atomization, the diameter of binary convection tower is 1-2m, be highly 2.5-4m, the top layout 3-6 of binary convection tower twin fluid atomization device, droplet through atomization is uniformly distributed in binary convection tower, 4-6 warm air dispenser arranged in the bottom of binary convection tower, guarantee that warm air is uniformly distributed in binary convection tower inside, the droplet of the warm air that trough type solar heat-collector provides and process atomization, in binary convection tower, carry out two fluid thermal exchanges,
(4) at convection tower tower wall, scraper plate is set, utilize scraper plate to clear up the salt particle accumulating on tower wall, in convection tower bottom, arrange 4-6 auto spiral oar, the crystalline particle sticking at the bottom of convection tower Ta Bi and tower is departed to convection tower by scraper plate and water screw by crystalline particle respectively, and the crystalline particle of the centrifugation of utilizing water screw at the bottom of by tower delivered in crystal salt collector.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007013099A1 (en) * | 2005-07-25 | 2007-02-01 | Subramaniam Udhayamarthandan | A novel system of desalination of industrial effluent or saline water to industrial grade reuse or for potable quality |
| CN101712521A (en) * | 2009-11-05 | 2010-05-26 | 天津市环境保护科学研究院 | Method for spraying and desalting through residual pressure of reverse osmosis concentrated water |
| CN102010020A (en) * | 2010-12-27 | 2011-04-13 | 淄博运特能源科技有限公司 | Solar energy sea water desalinization heat collecting system |
| CN102730779A (en) * | 2012-07-24 | 2012-10-17 | 天津城市建设学院 | Solar zero-liquid-discharge sea water desalting plant and method |
| CN103058304A (en) * | 2012-12-31 | 2013-04-24 | 天津滨海环保产业发展有限公司 | Method for increasing desalination rate of strong brine |
-
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- 2013-12-27 CN CN201310749437.0A patent/CN103708570A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007013099A1 (en) * | 2005-07-25 | 2007-02-01 | Subramaniam Udhayamarthandan | A novel system of desalination of industrial effluent or saline water to industrial grade reuse or for potable quality |
| CN101712521A (en) * | 2009-11-05 | 2010-05-26 | 天津市环境保护科学研究院 | Method for spraying and desalting through residual pressure of reverse osmosis concentrated water |
| CN102010020A (en) * | 2010-12-27 | 2011-04-13 | 淄博运特能源科技有限公司 | Solar energy sea water desalinization heat collecting system |
| CN102730779A (en) * | 2012-07-24 | 2012-10-17 | 天津城市建设学院 | Solar zero-liquid-discharge sea water desalting plant and method |
| CN103058304A (en) * | 2012-12-31 | 2013-04-24 | 天津滨海环保产业发展有限公司 | Method for increasing desalination rate of strong brine |
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Application publication date: 20140409 |