12449-55-7
Magnesium hexafluorosilicate
CAS: 12449-55-7;16949-65-8
Molecular Formula: F6MgSi
12449-55-7 - Names and Identifiers
| Name | Magnesium hexafluorosilicate |
| Synonyms | Magnesium Fluosilicate Magnesium fluorosilicate Fluoride magnesium silicate Magnesium hexafluorosilicate magnesium bis[fluoro(oxo)silanolate] Magnesium fluorsilicate hexahydrate Tetrahydrofurfuryl alcoholMagnesium fluorosilicate |
| CAS | 12449-55-7 16949-65-8 |
| EINECS | 241-022-2 |
| InChI | InChI=1/2FO2Si.Mg/c2*1-4(2)3;/q2*-1;+2 |
12449-55-7 - Physico-chemical Properties
| Molecular Formula | F6MgSi |
| Molar Mass | 166.38 |
| Density | 1.788 |
| Melting Point | 120℃ |
| Physical and Chemical Properties | Characteristics of colorless or white rhomboid or needle-like crystals. No odor. melting point 120 ℃ (decomposition) relative density 1.788 solubility soluble in water, soluble in dilute acid, insoluble in hydrofluoric acid, insoluble in alcohol. |
| Use | Used as hardener and waterproofing agent for concrete, used for surface treatment of silica building and ceramic manufacturing |
12449-55-7 - Risk and Safety
| UN IDs | UN 2853 6.1/ PGIII |
| Hazard Class | 6.1 |
| Packing Group | III |
12449-55-7 - Upstream Downstream Industry
| Raw Materials | Silicon dioxide Fluorosilicic acid Hydrofluoric Acid Magnesium Hydroxide Magnesium Carbonate Magnesium oxide |
12449-55-7 - Nature
Open Data Verified Data
colorless or white rhomboid or needle-like crystals. No odor. The relative density was 1. 788. Melting point 120 °c (decomposition). It is not easy to deliquescence, but it can be weathered and lose the water of crystallization. Above 80 deg C dehydration decomposition, and the release of silicon tetrafluoride gas. Soluble in water, soluble in dilute acid, insoluble in hydrofluoric acid, insoluble in alcohol. The aqueous solution was acidic. The corresponding fluoride and silica can be formed when it acts with a base. Toxic!
Last Update：2024-01-02 23:10:35
12449-55-7 - Preparation Method
Open Data Verified Data
neutralization method: the fluoro-silicic acid solution (see fluoro-silicic acid) is prepared from fluorite, silica sand and sulfuric acid at a concentration of 20-22. B6, after purification, add to the reactor, then add the magnesite powder suspension and neutralize to pH value of about 3~4, then obtain the magnesium fluorosilicate solution, and then filter, concentrate, crystallize, centrifuge and dry, A finished product of magnesium fluorosilicate was obtained.
Last Update：2022-01-01 11:01:24
12449-55-7 - Use
Open Data Verified Data
It is mainly used as a hardener and a waterproofing agent to improve the hardness and strength of concrete. It is also used for fluorine weathering treatment of silica building surface, ceramic manufacturing, and fabric insect prevention. It can be used as an insecticide.
Last Update：2022-01-01 11:01:23
12449-55-7 - Safety
Open Data Verified Data
see sodium fluosilicate. Double-layer packaging. The inner packaging is made of polyethylene plastic film bag, and the thickness shall not be less than 0. 05mm; The outer packaging is made of plastic woven bag. Its performance and test methods shall comply with the requirements of type A in GB/t8946. 25kg net weight per bag. Should be stored in a cool, dry warehouse. Pay attention to moisture. Cover shall be provided during transportation to prevent rain and moisture. Do not store and transport together with food products and seeds. Toxic substances. Risk code: GB 6.1 class 61514. UN N0.2853IIMDG CODE p. 6250, category 6.1.
Last Update：2022-01-01 11:01:25
12449-55-7 - Reference Information
| Overview | magnesium fluorosilicate, typically in the hexahydrate MgSiF6 · 6H2O form, the hexahydrate is a colorless or white odorless needle-like or rhomboid crystal. Magnesium fluorosilicate crystals have high solubility in water and can be dissolved in acidic solution. In addition, they can be dissolved in dilute acid, which is difficult to dissolve in hydrofluoric acid and insoluble in alcohol. |
| Chemical reaction | magnesium fluorosilicate decomposes when heated in dilute acid, alkali solution or water. |
| Application | magnesium fluorosilicate can be used to improve the strength and hardness of concrete hardening agent and waterproof agent. It can also be used as a fluorine weathering treatment in the surface treatment of silica. Because of the toxicity of magnesium fluorosilicate, it can be used as an insecticide, and can also be used as a fabric, or as one of the active ingredients of pesticides. It can also be used in ceramic fabrication. Thus, magnesium fluorosilicate has a wide range of applications as a concrete reinforcing agent, a concrete hardening retarding agent, a rubber latex solidifying agent, a preservative, and a textile mothproofing agent. Reference quality standard |
| preparation method | 1809kg fluorite powder, 335kg silica sand and 1858kg sulfuric acid were sequentially put into the reaction converter to prepare fluorosilicic acid, the fluosilicic acid solution having a content of 20 to 22 ° be' was absorbed by an absorption column. After the sulfate was removed, it was driven into a neutralization kettle and neutralized to a pH value of 3 to 4 by adding a suspension of Isocratic bitter powder. After filtration, the filtrate was put into an evaporator, concentrated and then put into a crystallizer to cool the crystals. After drying, the magnesium fluorosilicate product was obtained. |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 26.3g/0 ℃;30.8g/20 ℃;34.9g/40 ℃;44.4g/60 ℃ |
| purpose | for use as hardener and waterproofing agent for concrete, for silica building surface treatment and manufacturing ceramics used as waterproofing agent and mothproofing agent |
Last Update：2024-04-10 22:29:15
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CAS: 16949-65-8
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View History
Raw Materials for 12449-55-7
Silicon dioxide
Fluorosilicic acid
Hydrofluoric Acid
Magnesium Hydroxide
Magnesium Carbonate
Magnesium oxide
Fluorosilicic acid
Hydrofluoric Acid
Magnesium Hydroxide
Magnesium Carbonate
Magnesium oxide