Chemical Dangerous Goods

- Jan 12, 2018 -

Chemical dangerous goods refers to the explosives, compressed gas and liquefied gas, flammable liquids, flammable solids, pyrophoric materials and wet combustibles listed in the classification standards stipulated in China's national standard "Dangerous Goods Classification and Product Numbering" , Oxidants and organic peroxides, poison products and corrosion products, is divided into seven categories.

Four taboos


Folded prohibited sand covered items


Once the fire is on, explosives generally do not necessarily explode in bulk as long as they are not stacked too high and not in sealed containers.


Can use intensive water or spray water gun to save. Do not cover with sand, hinder the gas diffusion, accelerate the explosion reaction, increase the power of the explosion.


(1) In the event of fire with water and fire, it is not allowed to extinguish water with water and water-containing foam because the chemical properties of the water-burned items are lively and can replace the hydrogen in the water to produce combustible gas , At the same time put the heat. Such as potassium metal, sodium metal water, the water can replace the hydrogen, the heat generated by the ignition of hydrogen.


Others such as triethylaluminum, triisobutylaluminum, aluminum powder, magnesium powder and so have a similar situation. Some water-based combustible hydrocarbons (gases), at the same time release heat caused by burning, explosion. Such as calcium carbide with water to produce acetylene gas, tributyl borate with water to produce butanol.


After the fire in these items, the main use of dry sand suppression.


(2) Peroxide in the oxidizer reacts with water to release oxygen to accelerate combustion. Such as sodium peroxide, potassium peroxide, calcium peroxide, barium peroxide and so on. After the fire can not fight with water, use dry sand, dry powder to save.


(3) sulfuric acid, nitric acid and other corrosive substances, in case of pressure intensive water flow, it will immediately boil up, so that acid splashes. Therefore, fuming sulfuric acid, chlorosulfonic acid, concentrated nitric acid and other fire, it is advisable to use water mist, dry sand, carbon dioxide extinguishing agent fighting.


(4) Some dangerous chemicals can generate poisonous or corrosive gas in case of water, such as methyldichlorosilane, trioxymethylsilane, zinc phosphide, aluminum phosphide, phosphorus trichloride, sulfurous chloride, etc. Water, can generate toxic or corrosive gas with hydrogen in water.


(5) powdery items such as sulfur powder, organic pigments, powder pesticides and other fires, can not be pressurized water impact, to prevent the powder flying to expand the accident. Available mist water.


(6) The proportion of less than 1, and water insoluble flammable liquid organic oxidant fire, water can not fight it out. Because water will sink below the liquid, splashing may occur, drifting to expand the fire.


Fires of the above items, should use foam, dry powder, carbon dioxide, 1211 and other fighting.


Collapse Disable foam fire fighting items


Some of the toxic chemicals in the cyanide, such as sodium cyanide, potassium cyanide and other cyanide heart, met the foam acid substances can produce toxic gas hydrogen cyanide. Therefore, you can not use chemical foam fire extinguishing, water and sand can be saved.


Collapse Do not use carbon dioxide fire extinguishing items


Water burning items in lithium, sodium, potassium, cesium, strontium, magnesium, aluminum, etc., because of their very lively nature of the metal, can capture the oxygen in carbon dioxide, a chemical reaction and combustion. After the fire of such items, currently only common dry sand suppression, you can also use 1211 to fight.


Flammable solids flash powder, magnesium, aluminum, aluminum, nickel alloy hydrogenation catalyst, also can not use carbon dioxide fire extinguishing.


In addition, to prohibit standing in the leeward direction and do not wear gas masks such as oxygen respirators or air respirators, to fight the cyanide, phosphorus, arsenic selenium compounds and most organic drugs in inorganic drugs fire.


How to safely summer


Folding warehouse building


For the warehouse building, should be non-thermal refractory materials for the roof, walls of the insulation layer; layer eave appropriate broadening, not to direct sunlight warehouse wall thickening appropriate, should not open the window, the use of indirect ventilation holes , Double door, double roof, windows as high as possible, and blue glass paint and other measures, the warehouse temperature is generally maintained at 28 degrees -30 degrees.


Folding warehouse


Cooling water pipes should be set on the roof, water pipes have a row of small holes, water pipes, fire pumps and fire water next, when the temperature is above 30 degrees, start fire pump water cooling, of course, can also deepen the warehouse block, deep well water Such as the case of wet combustible items, some particularly dangerous low-burning items, such as acetic acid, petroleum ether, etc., can be used to place the ice in the warehouse or set the cooling brine coil cooling measures to make the warehouse temperature control at 28 Degree below, some warehouses morning and night and window ventilation at night, into the cold air, while excluding combustible gas, at noon to close the doors and windows to prevent hot air into the warehouse to avoid temperature rise.


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