Uses of Inorganic chemicals

Uses of Inorganic chemicals

Uses: Sodium metasilicate is widely used in all kinds of washing industry. In the washing industry, such as super-concentrated laundry detergent, laundry detergent, laundry cream, dry cleaning agent, fiber bleach, fabric bleach, etc. It is also used in large quantities as a metal surface cleaner, beer bottle, floating product dissolver cleaner, and can be used as a metal rust inhibitor, scale cleaner, electrical parts cleaner after full dissolution, and can be used as a detergent in the food industry; in crude oil and natural drilling control extraction engineering, it can also be used as a mud consistency adjuster, mud uncoagulant In the construction industry, it is used as an acid-resistant mortar, acid-resistant commercial concrete and cement accelerator; in the paper industry, it can be used as a binder, a fee-spending ink agent, a paper surface treatment agent; in the textile industry, it is used as a printing and dyeing auxiliary, a fabric pretreatment agent; it can also be used as a filler in soap, a detergent, a preservative for eggs, as well as a vegetation molecular sieve, silicic acid and fireproof material. Sodium metasilicate is lubricious and can be used in the production of ceramic billet slurry; it is strongly alkaline, with strong detergency and buffering capacity, and can neutralise acidic dirt. It emulsifies fats and oils, has a counter-flocculating effect on inorganic substances, and has an anti-corrosive effect on metals, so it is one of the main ingredients in super-concentrated laundry detergents, and is also used in dishwashing detergents, food industry detergents, metal detergents and waste paper deinking.

Identification test: take a specimen of 200mg dissolved in 10ml of water, drop a drop of the liquid on the colour plate, add 1 drop of 4mol/L sodium hydroxide and 1 drop of liquid from 0.5g ammonium molybdate dissolved in 10ml of water, then add 3ml of sulphuric acid, which should appear dark yellow to show the presence of silicate. With a nickel-chromium alloy (nichrome) wire dipped into the sample liquid in test 1, stretching the flame, should appear bright yellow, indicating the presence of sodium.

Content analysis: 1g of silica is correctly weighed and placed in a beaker, acidified with 5ml of hydrochloric acid, evaporated to dryness on a steam bath, the operation is repeated once more with 5ml of hydrochloric acid, the residue is mixed with 1ml of hydrochloric acid and 2ml of water, hydrolysed on a steam bath until it becomes a soluble salt, filtered through ash-free filter paper, washed with hot water and transferred to a platinum crucible, dried at 105°C for 1h and charred at a lower temperature. It is then cauterised at 1000°C to a constant weight. Moisten the residue with a few drops of water, add 15 ml of hydrofluoric acid and 5 drops of 1:3 sulphuric acid, drive off the acid on a heating plate and then cauterise at 1000°C to a constant weight. Weigh 500mg of sodium oxide accurately, disperse in 150ml of water and heat until all dissolved. Add 2-3 drops of phenolphthalein test solution (TS-167) and 100.0 ml of 0.1 mol/L sulphuric acid. drop with 0.1 mol/L sodium hydroxide until pink, after subtraction of the two, 0.1 mol/L sulphuric acid per ml.

Toxicity: Corrosive, must not come into contact with eyes, skin or clothing and must not be inhaled as a vapour.GRAS (GMP; FDA, §184.1769a, 2000).

Chemical properties: White square crystals. Soluble in water and dilute alkaline solutions, insoluble in alcohols and acids. The aqueous solution is alkaline.