Machining and safety of the hottest magnesium allo

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Machining and safety of magnesium alloy parts (IV)

keeping the working environment clean at any time is very important to ensure the safety of grinding magnesium alloy parts. The connecting pipe between the grinding wheel and the vacuum cleaner must be checked and cleaned at least once a day, and the whole dust collection system should be thoroughly cleaned at least once a month. Magnesium powder shall not be allowed to accumulate on seats, windows, pipelines and other horizontal surfaces

too many dust collection equipment should not be connected to a centralized discharge system. The central dust collection system with long drying pipeline and the ordinary dust collection system with filter are not suitable for collecting magnesium powder

if wet grinding of magnesium alloy parts is to be carried out on computers, office equipment, automobiles, replacement glass and sheet devices or disc grinders in the market with the largest amount of belt grinding, a sufficient amount of cutting fluid should be used to collect all dust and transport it to the collection point

therefore, the following precautions must be taken when grinding magnesium alloy parts

a. there must be a grinding machine specially used for the processing of magnesium alloy parts, and a special label for magnesium must be attached. Before dressing the grinding wheel, thoroughly clean the vacuum cleaner

b. when reworking and grinding the surface of magnesium alloy parts washed with chromate, sparks may be caused, so be careful not to allow dust to gather nearby

c. grinding equipment operators should use smooth hats, smooth gloves and no load displacement Load time Displacement time Stress strain load (2) smooth flame retardant clothes with point extension pockets and cuffs, and the apron or protective clothing used should be clean, dust-free and easy to take off

d. warning signs should be placed in a conspicuous place

e. sufficient fire extinguishing equipment shall be stored in the working area

2.4 treatment of magnesium chips and fine powder

dry chips should be placed in clean and sealed steel containers and stored in places that will not come into contact with water

wet chips and sludge should be stored in a ventilated steel window in a remote place, and there must be sufficient ventilation to allow hydrogen to escape. It is particularly dangerous to pack wet chips and fine powder in tightly covered containers, because high concentrations of hydrogen are prone to explosion

at present, the common treatment method of magnesium chips, magnesium powder and sludge is to dissolve with 5% ferric chloride solution (generally 1kg dry magnesium uses 0.6kg ferric chloride), which can convert the vast majority of magnesium into non combustible magnesium hydroxide and magnesium chloride residues within a few hours. Since hydrogen will be produced in this reaction, it should be treated in an outdoor open container, and it is strictly forbidden to make a fire around the reactor, smoke or weld. When preparing 5% ferric chloride solution, the water in the sludge should be taken into account

2.5 magnesium dust burning fire extinguisher

a. class D fire extinguisher. Its material usually uses sodium chloride based powder or a graphite based powder after passivation. Its principle is to smother the fire by eliminating oxygen

b. covering agent or dry sand. Small area fire can be covered by it, and its principle is to smother the fire by eliminating oxygen

measurement of the accuracy of Jinan assay tensile machine C. cast iron debris. It can also be used in the absence of other good fire extinguishing materials. Its main function is to reduce the temperature below the ignition point of magnesium, rather than smother the fire

in short, under no circumstances should water or any other standard fire extinguisher be frequently changed in the zero position to extinguish the fire caused by magnesium. Water, other liquids, carbon dioxide, foam, etc. will react with burning magnesium, and strengthen the fire rather than suppress it

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