Description
Molecular Formula: F6H2Si
Molecular Weight: 144.09
Structural Formula:
Specification:
Items
Specifications
Boiling Point
108-109°C
Density
1.22g/mL at 20°C(lit.) 1.31g/mL at 25°C
Vapor Pressure
23hPa at 19.85℃
Refractive Index
1.3500
Flash Point
108-109°C
Solubility
H2O: 1mg/mL, clear, colorless
Acidity coefficient (pKa)
1.83[at 20℃]
Proportion
1.38(40%)
Water Solubility
Miscible with water
Hydrolysis Sensitivity
0:forms stable aqueous solutions
Stability
Stable in aqueous solution
Items | Specifications |
Boiling Point | 108-109°C |
Density | 1.22g/mL at 20°C(lit.) 1.31g/mL at 25°C |
Vapor Pressure | 23hPa at 19.85℃ |
Refractive Index | 1.3500 |
Flash Point | 108-109°C |
Solubility | H2O: 1mg/mL, clear, colorless |
Acidity coefficient (pKa) | 1.83[at 20℃] |
Proportion | 1.38(40%) |
Water Solubility | Miscible with water |
Hydrolysis Sensitivity | 0:forms stable aqueous solutions |
Stability | Stable in aqueous solution |
Function:
1. Hexafluorosilicic acid is a strong acid, which can ionize hydrogen ions in aqueous solution and has the universality of acid.
2. Fluorosilicate ion () has strong coordination ability. This coordination can change the chemical properties and reactivity of metal ions.
Application:
1. In the flotation process of nonferrous metal ores such as lead and zinc ores, fluorosilicic acid can be used as an inhibitor.
2. Used for pickling and surface cleaning of metals (such as steel, aluminum, etc.). It can also prevent excessive corrosion of the metal in the pickling process and play a certain role in corrosion inhibition.
3 is an important raw material for the production of fluoride (such as sodium fluoride, ammonium fluoride, etc.) and silicate (such as silica gel, sodium silicate, etc.).
4. As a raw material for preparing some catalysts. For the preparation of catalysts in petrochemical, organic synthesis and other fields, such as catalysts for some organosilicon compounds.
5. In the glass production process, fluorosilicic acid can be used as a clarifying agent and flux.
6. As an additive to cement, it can improve the early strength of cement and improve the performance of cement.
7. Fluorosilicic acid has a certain control effect on some crop diseases (such as wheat rust, rice blast, etc.).
8. Can be used as an additive to trace element fertilizer.
