CN102107938B - Method for removing fluorine from water - Google Patents
Method for removing fluorine from water Download PDFInfo
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- CN102107938B CN102107938B CN 201110003669 CN201110003669A CN102107938B CN 102107938 B CN102107938 B CN 102107938B CN 201110003669 CN201110003669 CN 201110003669 CN 201110003669 A CN201110003669 A CN 201110003669A CN 102107938 B CN102107938 B CN 102107938B
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- fluorine
- tricalcium phosphate
- water body
- water
- defluorination
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Abstract
The invention discloses a method for removing fluorine from water. The method for removing the fluorine from the water comprises the following steps of: a) crushing tricalcium phosphate to obtain tricalcium phosphate powder; b) adjusting the pH value of fluorine-containing water to be 4 to 5; and c) adding the tricalcium phosphate powder into the water obtained in the step b), completely stirring for 70 to 90 minutes and then filtering, wherein the mass ratio of the added tricalcium phosphate to fluorine in the fluorine-containing water is 2,000-4,000:5. By the fluorine-removing method, the fluorine in the water can be obviously removed, the fluorine-removing ratio is high and the fluorine-removing capacity of the tricalcium phosphate is high. The using amount of the tricalcium phosphate is increased properly, so the fluorine-removing ratio can be increased and the fluorine content of the water reaches drinking water standard.
Description
Technical field
The present invention relates to a kind of method of water body defluorination.
Background technology
Fluorine is one of trace element of needed by human, and (water fluorine 0.5～1mg/L) can prevent carious tooth, enhances skeletal, preventing osteoporosis disease to an amount of fluorine.
Fluorine is the element of a dual threashold property, and its excessive and deficiency all can be brought harm to human body.
Human body is taken in fluorine through number of ways such as drinking-water, food and air.General adult obtains the fluorine of 2.4mg every day from diet, wherein from water 1.4mg, account for 60% of total intake; Food 1.0mg accounts for 40%.Air fluoride can be ignored in the ordinary course of things, but atmospheric pollution should be paid attention to.The mankind are mainly derived from food for obtaining of fluorine: sea-food, tealeaves, apple, milk, egg, drinking-water etc.The daily tap water fluorine content of people generally is controlled at 0.5～1mg/L.
Fluorine picked-up not enough (the water fluorine is lower than 0.5mg/L) can cause carious tooth, osteoporosis, bone growth slowly, symptoms such as bone density and fragility increase.Excessive fluorine (the water fluorine is higher than 1mg/L) can cause dental fluorosis, osteofluorosis, even can cause fluorosis.
Endemic fluorine poisoning divides cloth cover very extensive in China, up to the present, except that Shanghai City, Hainan Province, all has Endemic Fluorosis to exist in all the other each province of China, municipality directly under the Central Government, the autonomous region.Endemic fluorine poisoning is a kind of chronic systemic disease, mainly shows on tooth and the bone.Fluorine mainly shows as dental fluorosis to the infringement of tooth, causes enamel chalk, painted, damaged change and serious wearing and tearing.Infant below main harm 7-8 year, in case form residual throughout one's life.Fluorosis causes skeletal fluorosis, mainly shows waist leg and whole body joint numbness, pain, osteoarthrosis deformity, hunch occurs, and dysfunction takes place, and even paralysis.Fluorine can also cause nervous system disorders, because fluorine coup injury neural system or bone disease transformation are compeled nervus centralis, also can cause corresponding sings and symptoms.In addition, fluorine also produces infringement in various degree to muscle, kidney, Tiroidina, parathyroid gland etc.Human body brings many harm to the excessive absorption of fluorine, and therefore, the exploitation and the research of defluorination material have very important significance.
At present; The method of water body defluorination mainly contains chemical precipitation method, coagulation sedimentation, absorption and ion exchange method and electrocoagulation, electroosmose process, reverse osmosis method etc., removes fluorine reagent and mainly contains lime, Tai-Ace S 150, aluminum chloride, bone black, zeolite, zirconium white, activated alumina, activated magnesia etc.But the water outlet with these methods and these agent treated is difficult to reach drinking water standard, and treatment process is complicated, flow process is many, poor effect, cost are higher.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of water body defluorination, step is following:
A) tricalcium phosphate is pulverized, obtained tricalcium phosphate powder;
B) pH to 4～5 of the fluorine-containing water body of adjusting;
C) in the water body that step b) obtains, add said tricalcium phosphate powder, through the abundant stirring after-filtration of 70～90min, wherein, the mass ratio of fluorine is in the add-on of said tricalcium phosphate and the said fluorine-containing water body: 2000～4000: 5.
Preferably, the particle diameter of the said tricalcium phosphate powder of step a) is less than 420 μ m; Step b) is regulated pH to 4～5 of said fluorine-containing water body with hydrochloric acid, and preferred pH value is 4; The mass ratio of fluorine is in the add-on of the said tricalcium phosphate of step c) and the said fluorine-containing water body: 4000: 5.
The present invention can reach following technique effect: defluorination method provided by the present invention can significantly be removed the fluorine in the water body, and fluoride removing rate is high, and the defluorination capacity of tricalcium phosphate is also very high.The consumption of suitable increase tricalcium phosphate can improve fluoride removing rate, makes water body fluorine content reach drinking water standard.
The present invention compares prior art and has following advantage: defluorination phosphorylating reagent three calcium sources are sufficient, and price is low, and are simple to operate, and fluoride removing rate is high, and the defluorination capacity of defluorinating agent is high.
Embodiment
Below in conjunction with specific embodiment the present invention is described further so that those skilled in the art can better understand the present invention and implementing, but the embodiment that lifts not conduct to qualification of the present invention.
Embodiment 1 finds out the optimal conditions of water body defluorination method of the present invention with orthogonal experiment method
Experimental procedure is following:
A) tricalcium phosphate is pulverized, obtained tricalcium phosphate powder;
B) pH to 4～5 of the fluorine-containing water body of adjusting;
C) in the water body that step b) obtains, add said tricalcium phosphate powder, through the abundant stirring after-filtration of 70～90min, wherein, the mass ratio of fluorine is in the add-on of said tricalcium phosphate and the said fluorine-containing water body: 2000～4000: 5.
The design of orthogonal experiment and working method:
According to following table each reagent in the experiment is quantitatively added: the fluorine content of measuring fluorine-containing water body is 5.881mg/L; Get the fluorine-containing water body of 50mL, (should not can there be bigger error in the pH value because measure F ionic concentration with ion selective electrode method less than 4 to specified value 4,5,6 to regulate pH with hydrochloric acid; And the adding of too many hydrochloric acid has improved the acidity of water body; Can produce secondary pollution to water body, and cost can uprise also), in this fluorine-containing water body, add the tricalcium phosphate powder of the particle diameter of certain mass (0.20g, 0.4g, 0.6g) less than 420 μ m (promptly crossing 40 mesh sieves); Abundant stirring through setting-up time (80min, 120min, 160min); Measure the fluorine content (deduction blank value) of final water body, calculate the fluoride removing rate (%) and the defluorination capacity (mg/kg) of tricalcium phosphate, during concrete data see the following form.
*Test the measured data of more than 3 repetitive operation experiment and all be higher than initial concentration (CF=5.881mg/L)
Can find out that from last table the pH value is that defluorination effect is better under 4～5 the condition, churning time 80min be adsorbable fully, the mass ratio of fluorine is about in the add-on of tricalcium phosphate and the said fluorine-containing water body: fluoride removing rate can reach 100% under 4000: 5 the condition.
Embodiment 2:
Use hydrochloric acid to regulate the pH to 4 of fluorine content as the 50mL water body of 5.881mg/L; In this fluorine-containing water body, add the tricalcium phosphate powder 0.20g of particle diameter less than 420 μ m (promptly crossing 40 mesh sieves); Abundant stirring through 80min; The fluorine content of measuring final water body is 0.002mg/L (deduction blank value), and fluoride removing rate is up to 99.966%, and the defluorination capacity of tricalcium phosphate reaches 1469.8mg/kg.
Embodiment 3:
Use hydrochloric acid to regulate the pH to 4 of fluorine content as the 50mL water body of 5.881mg/L; In this fluorine-containing water body, add the tricalcium phosphate powder 0.20g of particle diameter less than 420 μ m (promptly crossing 40 mesh sieves); Abundant stirring through 80min; The fluorine content of measuring final water body is 0.000mg/L (deduction blank value), and fluoride removing rate is up to 100%, and the defluorination capacity of tricalcium phosphate reaches 1470.3mg/kg.
Embodiment 4:
Use hydrochloric acid to regulate the pH to 4 of fluorine content as the 50mL water body of 7.611mg/L; In this fluorine-containing water body, add the tricalcium phosphate powder 0.10g of particle diameter less than 420 μ m (promptly crossing 40 mesh sieves); Abundant stirring through 80min; The fluorine content of measuring final water body is 2.951mg/L (deduction blank value), and fluoride removing rate is up to 61.23%, and the defluorination capacity of tricalcium phosphate reaches 2330mg/kg.
Embodiment 5:
Use hydrochloric acid to regulate the pH to 4 of fluorine content as the 50mL water body of 7.611mg/L; In this fluorine-containing water body, add the tricalcium phosphate powder 0.05g of particle diameter less than 420 μ m (promptly crossing 40 mesh sieves); Abundant stirring through 80nmin; The fluorine content of measuring final water body is 6.600mg/L (deduction blank value), and fluoride removing rate reaches 13.28%, and the defluorination capacity of tricalcium phosphate reaches 1025.4mg/kg.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that the technician in present technique field is done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (4)
1. the method for a water body defluorination is characterized in that, step is following:
A) tricalcium phosphate is pulverized, obtained tricalcium phosphate powder;
B) regulate said fluorine-containing water body pH to 4～5;
C) in the water body that step b) obtains, add step a) gained tricalcium phosphate powder, through the abundant stirring after-filtration of 70～90min, wherein, the mass ratio of fluorine is in the add-on of said tricalcium phosphate and the said fluorine-containing water body: 2000～4000: 5; Wherein, the particle diameter of the said tricalcium phosphate powder of step a) is less than 420 μ m.
2. the method for water body defluorination according to claim 1 is characterized in that, step b) is regulated pH to 4～5 of said fluorine-containing water body with hydrochloric acid.
3. the method for water body defluorination according to claim 1 is characterized in that, the said pH value of step b) is 4.
4. the method for water body defluorination according to claim 1 is characterized in that, the mass ratio of fluorine is in the add-on of the said tricalcium phosphate of step c) and the said fluorine-containing water body: 4000: 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110003669 CN102107938B (en) | 2011-01-10 | 2011-01-10 | Method for removing fluorine from water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110003669 CN102107938B (en) | 2011-01-10 | 2011-01-10 | Method for removing fluorine from water |
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| Publication Number | Publication Date |
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| CN102107938A CN102107938A (en) | 2011-06-29 |
| CN102107938B true CN102107938B (en) | 2012-10-17 |
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| CN 201110003669 Expired - Fee Related CN102107938B (en) | 2011-01-10 | 2011-01-10 | Method for removing fluorine from water |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076176A (en) * | 1993-03-15 | 1993-09-15 | 天津市化学工业学校 | High-efficient compound adsorbent for defluorination of drinking water |
| CN1125693A (en) * | 1994-12-30 | 1996-07-03 | 孙海东 | Fluorine-reduction processing method for water and its equipment |
| CN1215701A (en) * | 1997-01-18 | 1999-05-05 | 梁立达 | Method for treatment of high hardness flourine-contg. drinking water with food nutrient |
-
2011
- 2011-01-10 CN CN 201110003669 patent/CN102107938B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076176A (en) * | 1993-03-15 | 1993-09-15 | 天津市化学工业学校 | High-efficient compound adsorbent for defluorination of drinking water |
| CN1125693A (en) * | 1994-12-30 | 1996-07-03 | 孙海东 | Fluorine-reduction processing method for water and its equipment |
| CN1215701A (en) * | 1997-01-18 | 1999-05-05 | 梁立达 | Method for treatment of high hardness flourine-contg. drinking water with food nutrient |
Non-Patent Citations (1)
| Title |
|---|
| 闫秀芝等.CaCl2+磷酸盐法处理含氟废水的探讨.《环境保护科学》.1998,第24卷(第2期),12-14. * |
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| CN102107938A (en) | 2011-06-29 |
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