Packing, Storage and Transportation of Tablet Alkali

Flake alkali is usually made of 25 kg three-layer plastic woven bags, with plastic woven bags in the inner and outer layers and plastic inner bag in the middle layer. Tablets of alkali are classified as 8.2 alkaline corrosives by Classification and Marking of Common Hazardous Chemicals (GB13690-92). They belong to Grade 8 dangerous goods. Hazard Code: 1823. Store in a ventilated, dry warehouse or shed. Packaging containers should be complete and sealed. It should not be stored and mixed with flammable substances and acids. We should pay attention to moistureproof and rainproof during transportation. When a fire breaks out, water, sand and various fire extinguishers can be used to extinguish it, but firefighters should pay attention to the corrosiveness of the water dissolved in caustic soda.

The physical and chemical properties of the pure product are colourless transparent crystals with a relative density of 2.130. Melting point 318.4 C. Boiling point 1390 C. There are two kinds of commercial caustic soda: solid caustic soda and liquid caustic soda: pure solid caustic soda is white, block, flake, rod, granular, brittle; pure liquid caustic soda is colorless transparent liquid. Solid caustic soda has strong hygroscopicity. It is soluble in water, exothermic when dissolved, alkaline and slippery, soluble in ethanol and glycerol, insoluble in acetone and ether. It is highly corrosive and has corrosive effect on fibers, skin, glass, ceramics, etc. It reacts with metal aluminium and zinc, non-metallic boron and silicon to release hydrogen, disproportionates with halogenses such as chlorine, bromine and iodine, and neutralizes with acids to form salt and water.

When preserving solid sodium hydroxide, attention should be paid to sealing it to prevent exposure to the air to absorb moisture and decompose or with carbon dioxide. When glass bottles are filled with flake alkali or other forms of sodium hydroxide, glass stoppers should not be used. Rubber stoppers should be replaced because sodium hydroxide reacts with silica in glass to form sodium silicate, which makes it difficult for the bottle stoppers to bond with the bottle body.