GB No. 61513
CAS No. 7789-23-3
Molecular Formula KF
molecular 58.10

colorless cubic crystal, easy deliquescence; 133.3Pa vapor pressure (885 ° C); melting point 858 ° C; the boiling point 1505 ° C; solubility : dissolve in water, hydrofluoric acid, ammonia, dissolved in alcohol; density : relative density (water = 1) 2.48; Stability : stability; risk Marker 15 (hazardous materials); the main purposes : reagents for the analysis, complex formation agents, and glass sculpture and for food preservation, as well as for pesticides

2. The impact on the environment
the material harm to the environment, with special attention to water pollution.

a health hazard

pathways : inhaled, ingested.
health hazards : the right goods mucosa, upper respiratory tract, eyes, skin tissue is extremely destructive. After inhaling may jets and bronchial inflammation, edema, convulsions and chemical pneumonia, pulmonary edema and death. Poisoning performance burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting.

two, toxicology information and environmental behavior

acute toxicity : LD₅₀245mg/kg (rat oral)
irritation : rabbit eyes by 20mg (24 hours), moderate stimulus.

Although appropriate amount of fluoride is necessary for the human body over the safety area but will cause harm and lesions, lesions and the degree of drinking water, food, air and organizations of the fluoride content and positive phase. When the long-term from the contaminated water, fluoride intake, the first rheumatism often similar to the pain of the disease, cervical and lumbar pain and stiffness flu; After occurred limbs and insensitive to pain, and then there around and joint deformities, King sickness and tinnitus, nausea, anorexia, constipation and other symptoms. The major clinical symptoms of dental fluorosis, teeth yellow, brown or black spots and corrosion and easy to wear, or broken off. Acute poisoning, the main performance for the thirsty, gastrointestinal reaction ulcers, bleeding and cramps, collapse and paralysis.

hazardous characteristics : no special combustion characteristics of the explosion.
combustion (decomposition) products : hydrogen fluoride.

3. Scene emergency monitoring methods
speed measurement tube; Ion selective electrode "sudden environmental pollution monitoring and emergency treatment and disposal technologies," 10,000 < too editor / P>

4. Laboratory monitoring methods
ion selective electrode (GB7484-87, the water, fluoride)
lime filter-fluoride ion selective electrode (GB/T15433-95 air, and Fluoride )
membrane fluoride ion selective electrode (GB/T15434-95 air, and fluoride)

5. Environmental standards
China (TJ36-79) Workshop harmful substances in the air that the maximum allowable concentration 1mg/m3 [F]
China (TJ36-79) settlements atmosphere of the most hazardous substances high permissible concentration (fluoride) 0.02mg/m3 (a value); 0.007mg/m3 (days average)
Chinese (GB16297-1996) Air Pollutant Discharge Standards (fluoride) â‘?maximum allowable emission concentrations ( mg/m3) :
9 ~ 90 (Table 2); 11 to 100 (Table 1)
â‘?maximum allowable emission rate (kg / h) : 0.10
2 ~ 4. 2 (Table 2); 0.12 ~ 4.9 (Table 1) 0.15
3 ~ 6.3 (Table 2); 0.18 ~ 7.5 (Table 1) No group
â‘?Weaving emissions monitoring concentration limits (mg/m3) :
0.02 (Table 2); 0.02 (Table 1)
China (GB5048-92), irrigation water quality standards (fluoride) 2.0 ~ 3.0mg / L (water and dry vegetables)
Chinese (GB11607-89) Fisheries water quality standards 1 mg / L (fluoride)
China (GB5749-85) health standards for drinking water a .0 mg / L (fluoride)
China (GB/T14848-93) groundwater quality standards (mg / L) Class I 1.0; Type II 1.0; Class III 1.0; category IV 2.0 ; category V 2.0 and above (fluoride)
China (GHZB1-1999), surface water quality standard (mg / L)
following Class I 1.0; Type II 1.0; Class III 1.0; category IV 1.5; category V 1.5 (fluoride)
China (GB8978-1996)
sewage discharge standards (mg / L)
a 10; two 10 ~ 20; three 20 ~ 30 (fluoride)

China (GB5058.3-1996), solid waste leaching toxic identification standard value 50mg / L (fluoride)

6. Emergency treatment and disposal methods
a leakage contingency

isolation leakage polluted area, located around the warning signs, the proposed emergency personnel wearing gas masks, chemical protective clothing to wear. Do not direct contact with leakage. A small leak : Dust to avoid using cleaner shovel collection in a dry, clean covered containers. We could also use a lot of water rinse, diluted Add Water Wastewater System. Large Leak : recycling or collection shipped to the disposal of waste disposal sites.

containing wastewater treatment mainly in the following three ways : 1
calcium precipitation. Plus milk of lime-containing wastewater so that the pH to 7.0 to 7.5, with an ~ 1 polymer flocculant (PAM). After residual fluoride in the water is usually in the 15 to 40 mg / L, respectively.
2 calcium-aluminum sulfate coprecipitation. Use milk of lime and aluminum sulfate-containing wastewater treatment, the pH should be controlled in 6 to 7, add the milk of lime volume
Ca2 + / F - 0.8 = 10, the amount of aluminum sulfate 3000 / L, treated wastewater residual fluoride 2.0 ~ 0 .1 mg / L.
3 calcium-phosphate law. This law is by adding calcium and phosphate from wastewater remove fluoride. When the optimum combination of calcium Ca2 + / F - 0.8 = 10, phosphate add 1400 ~ 3500 / L, treated wastewater residual fluoride at 2.0 ~ 0.1 mg / L.

two protective measures

respiratory protection : concentration in air overweight, they should wear protective masks. Emergency rescue or escape, it is recommended to wear self-contained breathing apparatus.
eye protection : Wear protective chemical safety glasses.
physical protection : wear appropriate protective clothing.
hand protection : Wear gloves against chemicals.
other : work site prohibit smoking, eating and drinking. Work to complete, take a shower. Overalls are not allowed to bring non-work areas. Separate storage of toxic pollution by the clothes, washed standby. To maintain good health habits.

three, and emergency measures

contact with the skin : stripped of contaminated clothing, immediately wash with water for at least 15 minutes. If it burns, by acid burns treatment.
eye contact : immediately filed eyelid, mobile water rinse for 10 minutes or 2% sodium bicarbonate solution rinse. Medical treatment.
Inhalation : rapidly from the scene to fresh air. To keep the airway patency. Difficult to breathe oxygen. Respiratory stop immediately mouth. Medical treatment. Fresh into
: patients immediately clear when the mouthwash, or egg white to the blues. If there vomiting, headache from it and prevent vomit into the trachea. Medical treatment.

fire fighting methods : dry, sandy soil.