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What are the toxic sources of sulfur hexafluoride gas?
发布时间：2017-05-15
来源：ydlcb 浏览次数：46次
The toxicity of sulfur hexafluoride gas mainly comes from five aspects:
1, some toxic products of sulfur hexafluoride gas in electrical equipment when the high-temperature arc occurs.
2, sulfur hexafluoride products are not pure, containing highly toxic low sulfur fluoride, hydrogen fluoride and other toxic gases when leaving the factory.
3, the sulfur hexafluoride gas and decomposition in the electrical equipment react with the electrode (CU-W alloy) and metal materials (AL, Cu) to produce some toxic products.
4, the sulfur hexafluoride gas decomposition in the electrical equipment and the water in the chemical reaction to produce some toxic products.
5. Sulfur hexafluoride gas and decomposition in electrical equipment react with insulating materials to produce certain toxic products. Such as insulating parts with epoxy phenolic glass cloth plate (rod, tube) containing silicon components; Or epoxy resin castable parts, moulded parts and porcelain bottles, silicone rubber, silicone grease with quartz sand and glass as fillers play a chemical role to generate SiF4, Si (CH3) 2F2 and other products.
Toxic gases:
1. Thionyl fluoride (SOF2)
Colorless and highly toxic gas, can invade the lungs, cause acute edema of lung tissue, affect gas exchange, make the lungs oxygenated and congested resulting in asphyxiation death, it has a strong disgusting odor, can be used as a warning signal. The lethal concentrations in mice and rabbits were 10 × 10-6 and 50 × 10-6 (V/V).
2. Sulfuryl fluoride (SO2F2)
Clonic compound, colorless, odorless, irritating to lung tissue at higher concentrations, causing alveolar hemorrhage. The lethal concentrations in mice and rabbits were 200 × 10-6 and 400 × 10-6 (V/V).
3. Sulfur tetrafluoride (SF4)
Colorless gas, has a pungent odor similar to SO2, toxic and phosgene, has an invasive effect on the lungs.
4. Sulfur difluoride (SF2)
The boiling point is 35 ℃, extremely unstable, more active after heating, easy hydrolysis to produce S, O2, HF, etc., its toxicity is comparable to HF
5, sulfur fluoride (S2F2)
It is a colorless gas at room temperature and has strong toxicity. It generates HF after encountering water and has a destructive effect similar to phosgene on the respiratory system.
6. Hydrogen fluoride (HF)
Colorless gas or liquid, with a strong pungent odor, easily dissolved in water, the formation of hydrofluoric acid, the general material has a strong corrosion. HF has a strong stimulating effect on the skin and mucous membrane, and can cause pulmonary edema, pneumonia, etc.
7. Sulfur decafluoride (S2F10)
At normal temperature and pressure, it is a colorless volatile liquid, a highly toxic substance, and its toxicity is about 300 times that of SOF2. S2F10 mainly invades pulmonary sites, causing pulmonary hemorrhage and pulmonary edema. The lethal concentration in mice was 1 × 10 (V/V).
8, Aluminum trifluoride (AIF3)
White powder, usually adsorbed a large number of toxic gaseous decomposition products, so should be regarded as a strongly corrosive and toxic substance. ALF3 dust can irritate the skin and cause rashes, which are invasive to the respiratory system and lungs.
9. Oxygen disulfide fluoride (S2F10O)
Highly toxic substance, strong invasion of lung tissue. The lethal concentration in mice was 20 × 10 (V/V).
Personal protection measures:
(1) The work site should be strongly ventilated, and the maintenance personnel should be in an upwind position;
(2) Wear a gas mask and protective gloves;
(3) The discharged gas is recovered, or the gas is discharged into the gutter with a conduit, and it is not suitable to be discharged directly to the atmosphere;
(4) Wash face, neck, arms and hands thoroughly with soap and plenty of water before or after work breaks;
(5) If accidentally exposed to a large dose of gas, should immediately wash, change clothes, and promptly go to the hospital for observation and treatment.