Molecular Formula | F6H2MgOSi |
Molar Mass | 184.4 |
Density | 1,79 g/cm3 |
Melting Point | 120°C (dec.) |
Appearance | Form Powder, color white |
PH | 3.1 |
Storage Condition | 应贮存在阴凉、干燥的库房中,注意防潮。 |
Physical and Chemical Properties | Chemical quality This product is colorless or white rhomboid or needle-like crystal. Relative density 1.788, dehydration at 80 ℃ and decomposition at 100 ℃. Soluble in water, soluble in dilute acid, insoluble in hydrofluoric acid, insoluble in alcohol. The aqueous solution reacts acidic and can produce corresponding fluoride and silica when it reacts with alkali. It is not easy to deliquesce. After weathering, it loses water and becomes anhydrous. |
Use | Use 1, for leather storage in the anti-insect, and has a waterproof effect. 2, used as concrete hardening agent and waterproof agent, used for silica building surface treatment and the manufacture of ceramics |
Caution | Toxic. Wear gloves and masks when in contact. Do not use hooks during shipment, handle with care to prevent packaging from breaking. Do not store or transport food, seeds, etc. together. |
Risk Codes | 25 - Toxic if swallowed |
Safety Description | S24/25 - Avoid contact with skin and eyes. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
UN IDs | 2853 |
TSCA | Yes |
HS Code | 28269080 |
Hazard Class | 6.1 |
Packing Group | III |
Raw Materials | Hexafluorosilicic acid Silica sand |
1809kg of fluorite powder, 335kg of silica sand, and 1858kg of sulfuric acid were sequentially added to the reaction converter to prepare fluorosilicic acid. A fluorosilicic acid solution with a content of 20-22 ° Be was absorbed by an absorption tower. After removing sulfate, transfer it into a neutralization kettle and neutralize it with a suspension of bitter powder until the pH value is 3-4. Filter, pour the filtrate into the evaporator, concentrate it, and then pour it into the crystallizer to cool and crystallize. Dry product.
production method
1 809kg fluorite powder, 335kg silica sand and 1 858kg sulfuric acid were successively put into the reaction converter to prepare fluorosilicic acid, and the fluorosilicic acid solution with the content of 20~22 Bé was absorbed by the absorption tower. After removing sulfate, it is driven into a neutralization kettle, and the suspension of diamond bitter powder is added to neutralize until the pH value is 3~4. Filter, drive the filtrate into the evaporator, concentrate and drive into the crystallizer to cool and crystallize. The product is obtained after drying.
category
toxic substances
toxicity classification
High toxicity
acute toxicity
oral-guinea pig LD50: 200 mg/kg
flammability hazard characteristics
Non-combustible; the fire field emits toxic fluoride and magnesium oxide, silicon oxide smoke; reacts with acid to release toxic hydrogen fluoride gas
storage and transportation features
The warehouse is ventilated and dry at low temperature; it is stored and transported separately from food and acids
fire extinguishing agent
A lot of water
occupational standards
TWA 2.5 mg (fluorine)/m3
Specific gravity | 1.788 |
EPA chemical information | Silicate(2-), hexafluoro-, magnesium (1:1), hexahydrate (18972-56-0) |