CN102942272A - Treatment method for sea water decalcification through equilibrium adsorption of centrifuge - Google Patents
Treatment method for sea water decalcification through equilibrium adsorption of centrifuge Download PDFInfo
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- CN102942272A CN102942272A CN 201210530271 CN201210530271A CN102942272A CN 102942272 A CN102942272 A CN 102942272A CN 201210530271 CN201210530271 CN 201210530271 CN 201210530271 A CN201210530271 A CN 201210530271A CN 102942272 A CN102942272 A CN 102942272A
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Abstract
The invention relates to a treatment method for sea water decalcification through equilibrium adsorption of a centrifuge, comprising the specific steps of: (1) mixing an adsorption material with water and preparing slurry; (2) standing the slurry obtained in the step (1) for 4-6 minutes, precipitating the material and pouring out the supernatant water, thereby obtaining the subsurface material which is a water mixture; (3) feeding the water mixture into the centrifuge at the feeding speed of 0.6-1 m3/h under the control of a pump, and centrifuging to obtain the filtrate, namely the decalcified sea water. The method for sea water decalcification provided by the invention is simple, the ion exchange capacity in the method is greater than 2 mol Ca<2+>/kg, adsorptione equilibrium is established in 0.3 seconds, and therefore, the sea water decalcification time is greatly shortened and the production cost of the enterprise is saved. The adsorption material used in the method is an amorphous-state inorganic ion exchange material; and the adsorption material can be used under the condition of 0-250 DEG C, and as a result, the method is convenient to operate and the production efficiency is improved.
Description
Technical field
The invention belongs to sea water desaltination preconditioning technique field, relate to a kind of method of sea water desaltination, the treatment process of especially a kind of whizzer equilibrium adsorption seawater decalcification.
Background technology
In Bohai Rim, shortage of fresh water has become the important factor of restriction socio-economic development, and solution except economizing on water, also will actively seek to increase income.Sea water desaltination is considered to the effective means that this area increases income.In addition, a large amount of salt pans have been occupied in the fast development of this area's industry, have restricted thus the indispensable salt manufacturing of national economy and the development of salt chemical engineering.People solve the various approach that sea water desaltination is alleviated shortage of water resources and developed simultaneously salt chemical engineering at positive seeking synchronization.
Sea water desaltination is the swiftest and the most violent with reverse osmosis method and Re Fa development.But strong brine reaches salinity 6% and the calcium deposition easily occurs when above in the reverse osmosis method, stops up the duct of reverse osmosis membrane.And utilize the hot method desalination technology of thermal evaporation, also owing to existing the easy scale-forming ion such as calcium, sulfate radical to be faced with the problems such as equipment scaling in the seawater, especially even more serious when high temperature because the solubleness of calcium sulfate in the certain temperature range section since the factor such as Dehydration and raise with temperature descend).Therefore the restriction that all deposits because of calcium at present of these two kinds of common ways and be difficult in sea water desaltination the concentration of concentrated seawater brought up to the directly degree of salt manufacturing.
By retrieval, find the following patent publication us relevant with patent application of the present invention:
1, the production method of desalting seawater by de-hardening preprocessing (CN102001763A), seawater adopts chemical method to be combined with super, micro-filtration embrane method and extracts calcium carbonate, magnesium hydroxide among the present invention, extract the seawater behind calcium, the magnesium ion, when desalination produced fresh water, institute's strong brine that produces supplied to fully utilize.After the present invention carries calcium, proposes the pre-treatment of magnesium hard-off by seawater, the desalination process need not be added Scale inhibitors, not only the fresh-water recovery rate reverse osmosis method can reach more than 60%, distillation method can reach more than 80%, but by-product nanometer grade calcium carbonate and nanometric magnesium hydroxide product in the preprocessing process, strong brine can the high value added product form fully utilize after the desalination, has greatly reduced investment and the running cost of sea water desaltination, is a typical low-carbon (LC), green, recycling economy desalination technology.
2, the method (CN101381147) of sea water calcium-removing concentration utilization, relate to the utilization of seawater, comprise sea water desalinating plant, tripping device, described sea water desalinating plant adopts multiple-effect evaporation technique, its water generation ratio reaches more than 20, described sea water desalinating plant front end is provided with calcium-removing device, after seawater directly contacts, and 95% above calcium ion in the adsorbing seawater.After adopting above method, avoided in the desalination process, because seawater contains the reduction that calcium salt is tied the plant efficiency that the calcium dirt causes, improved simultaneously the water generation ratio of desalting equipment, also can further separate final gained strong brine, obtain the Chemicals such as sodium-chlor, Repone K, magnesium chloride, industrial bromine, sal epsom, promoted the strong brine utilization ratio, avoid discharging cause waste and to the pollution of environment.
By contrast, patent application of the present invention and above-mentioned patent publication us exist essential different.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide a kind of method simple, easy to operate, save enterprise's production cost, the treatment process of the whizzer equilibrium adsorption seawater decalcification of enhancing productivity.
The present invention realizes that the technical scheme of purpose is:
The treatment process of a kind of whizzer equilibrium adsorption seawater decalcification, concrete steps are as follows:
⑴ mix sorbing material with water, the furnishing slurry;
⑵ be 4-6 minute with the slurry time of repose among the step ⑴, and then deposited material topples over the upper strata clear water, gets subsurface material, is water mixture;
⑶ be 0.6 ~ 1 m with water mixture by pump control input speed
3/ h enters in the whizzer, centrifugal after, gained filtrate is the decalcification seawater.
And the ion-exchange material among the described step ⑴ is the non-crystalline state inorganic ion exchange material.
And the sorbing material among the described step ⑴ and the mass ratio of water are 1:2-3.
And the slurry time of repose is 5 minutes among the described step ⑵.
And input speed is 0.8 m among the described step ⑶
3/ h.
The application of the treatment process of aforesaid whizzer equilibrium adsorption seawater decalcification in distillation sea water desalting and decalcification processing.
The treatment process of aforesaid whizzer equilibrium adsorption seawater decalcification is in the enrichment of constant or trace element, or the application of the improvement aspect of heavy metal-polluted water.
And described constant or trace element are constant or the trace element in bittern, the brackish water.
Advantage of the present invention and beneficial effect are:
1, the method method of seawater decalcification of the present invention is simple, and the loading capacity in the method is greater than 2 mol Ca
2+/ kg, and 0.3 s can reach adsorption equilibrium, greatly shortened the time of seawater decalcification, saved the production cost of enterprise; Employed sorbing material is the non-crystalline state inorganic ion exchange material in the method, and this sorbing material all can use under 0 ℃ ~ 250 ℃ condition, so that the method is easy to operate, has improved production efficiency.
2, the seawater after the method deliming of seawater decalcification of the present invention forms stablely, can remove in the seawater 80% Ca
2+, solve the difficult problem of equipment scaling in the seawater concentration process, thereby increased considerably the water generation ratio of low-temperature multiple-effect sea water desalting equipment, reduced and made the water cost.
3, can obtain concentrated seawater about 20% after the sea water desaltination after the method decalcification of seawater decalcification of the present invention, be expected to realize without salt pan batch production salt manufacturing, solve the coastland lacks of water such as Tianjin, lacked the again contradiction of salt deficiency of ground.Also this technology and residual heat of electric power plant utilization and vent gas treatment can be combined simultaneously.
4, the method for seawater decalcification of the present invention is amplified for sea water preprocessing decalcification industry provides foundation, and expectation with this technology with utilize residual heat of electric power plant to carry out the high temperature multi-effect evaporation and concentrated seawater is directly produced vacuum salt, treatment of Power waste gas combines simultaneously; For sea water desaltination, salt manufacturing-salt chemical engineering, flue gas of power plants processing and the UTILIZATION OF VESIDUAL HEAT IN of Bohai Rim, develop a circular economy and open up the approach of a novel efficient energy-saving environmental protection.
Description of drawings
Fig. 1 is whizzer seawater decalcification device of the present invention.
Embodiment
The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
Employed method among the present invention if no special instructions, is ordinary method; Employed reagent among the present invention if no special instructions, is conventional reagent.
One, know-why
This process system optionally spins off calcium in seawater by ion-exchange with the novel inorganic ion-exchange material.So-called ion-exchange is by with the ion (ion-exchange material in the exchang medium, it mainly is solid, also can be the liquid with film isolation) but carry out inverse permutation with ion in solution or the melting salt, and the skeleton structure of its process intermediate ion exchange material does not change.
Patent application of the present invention fully mixes material with seawater under equilibrium conditions, carries out the selective removal of Calcium in Seawater.Material mixes with seawater, carries out with static agitation, and need leave standstill 5 minutes.
Two, material, instrument and equipment
All seawater come in saltern, Hangu.In the laboratory work, seawater uses after filtering through G3 type glass sand core funnel.
Testing installation mainly comprises the seawater storage tank, auger tank, header tank (or water pump), whizzer, product water pot.And relevant pump, valve, instrument etc.Experimental installation is seen Fig. 1.
The concentration analysis of Calcium in Seawater, magnesium, potassium is all taked the chemical titration of sea water system element.Through sending University Of Science and Technology Of Tianjin outside and the Tianjin Institute of Geology compares test verification.
Embodiment 1
1, whizzer seawater decalcification test
The treatment process of a kind of whizzer equilibrium adsorption seawater decalcification, step is as follows:
⑴ mix the furnishing slurry with 12 kg sorbing materials with 30 kg water;
⑵ be 5 minutes with the slurry time of repose among the step ⑴, and then deposited material topples over the upper strata clear water, gets subsurface material-water mixture;
⑶ be 0.8 m with mixture by pump control input speed
3/ h enters in the whizzer, and centrifugal throwing away by water outlet by filter cake flowed out, and gained filtrate is the decalcification seawater.
Embodiment 2
1, whizzer seawater decalcification test
The treatment process of a kind of whizzer equilibrium adsorption seawater decalcification, step is as follows:
⑴ mix the furnishing slurry with 12 kg sorbing materials with 24 kg water;
⑵ be 4 minutes with the slurry time of repose among the step ⑴, and then deposited material topples over the upper strata clear water, gets subsurface material-water mixture;
⑶ be 0.6 m with mixture by pump control input speed
3/ h enters in the whizzer, and centrifugal throwing away by water outlet by filter cake flowed out, and gained filtrate is the decalcification seawater.
Embodiment 3
1, whizzer seawater decalcification test
The treatment process of a kind of whizzer equilibrium adsorption seawater decalcification, step is as follows:
⑴ mix the furnishing slurry with 12 kg sorbing materials with 36 kg water;
⑵ be 6 minutes with the slurry time of repose among the step ⑴, and then deposited material topples over the upper strata clear water, gets subsurface material-water mixture;
⑶ be 1 m with mixture by pump control input speed
3/ h enters in the whizzer, and centrifugal throwing away by water outlet by filter cake flowed out, and gained filtrate is the decalcification seawater.
The result detects and data analysis:
Container the Caspian Sea water of having investigated 1.2 meters in bucket dark (highly) left standstill 5 minutes after material stirs, find that material sinks to the bottom basically, only need to topple over namely can be with more than the overwhelming majority (〉 85% even 90%) seawater pour out as supernatant liquid, speed is very fast.Therefore advise adopting pond equilibrium adsorption decalcification in the actual production, staticly settling (falling) material, then drive valve and emit clear liquor, the material and the small part seawater (~ 10%) that are deposited on the bottom enter the whizzer separation.
To sum up, as seen the treatment process of this whizzer equilibrium adsorption seawater decalcification can be applicable to following several respects:
1, the treatment process of this whizzer equilibrium adsorption seawater decalcification can be applied in distillation sea water desalting and the decalcification processing.
2, the treatment process of this whizzer equilibrium adsorption seawater decalcification can be applied in the enrichment, particularly bittern of constant or trace element, constant or the trace element in the brackish water.
Claims (8)
1. the treatment process of whizzer equilibrium adsorption seawater decalcification, it is characterized in that: concrete steps are as follows:
⑴ mix sorbing material with water, the furnishing slurry;
⑵ be 4-6 minute with the slurry time of repose among the step ⑴, and then deposited material topples over the upper strata clear water, gets subsurface material, is water mixture;
⑶ be 0.6 ~ 1 m with water mixture by pump control input speed
3/ h enters in the whizzer, centrifugal after, gained filtrate is the decalcification seawater.
2. the treatment process of whizzer equilibrium adsorption seawater according to claim 1 decalcification, it is characterized in that: the ion-exchange material among the described step ⑴ is the non-crystalline state inorganic ion exchange material.
3. the treatment process of whizzer equilibrium adsorption seawater according to claim 1 decalcification, it is characterized in that: the sorbing material among the described step ⑴ and the mass ratio of water are 1:2-3.
4. the treatment process of whizzer equilibrium adsorption seawater according to claim 1 decalcification, it is characterized in that: the slurry time of repose is 5 minutes among the described step ⑵.
5. the treatment process of whizzer equilibrium adsorption seawater according to claim 1 decalcification, it is characterized in that: input speed is 0.8 m among the described step ⑶
3/ h.
6. such as the application in distillation sea water desalting and decalcification are processed of the treatment process of each described whizzer equilibrium adsorption seawater decalcification of claim 1-5.
7. such as the enrichment at constant or trace element of the treatment process of each described whizzer equilibrium adsorption seawater decalcification of claim 1-5, or the application of the improvement aspect of heavy metal-polluted water.
8. the treatment process of whizzer equilibrium adsorption seawater according to claim 7 decalcification is in the enrichment of constant or trace element, or the application of the improvement aspect of heavy metal-polluted water, it is characterized in that: described constant or trace element are constant or trace element in bittern, the brackish water.
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Application publication date: 20130227 |