Sodium stannate

Inorganic

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Sodium stannate is an inorganic substance with the molecular formula Na two [Sn(OH) six ]And the molecular weight is 266.73.^{[3 ]}

It is colorless hexagonal plate crystal or white powder. be used as Mordant , textile Fire retardant Weight increasing agent and manufacturing ceramics 、 Glass And for Tinning Etc.

Chinese name: Sodium stannate
Foreign name: sodium stannate
chemical formula: Na two [Sn(OH) six ]
molecular weight: two hundred and sixty-six point seven three
CAS login number: 12027-70-2

EINECS login number: 234-724-5
Melting point: 140 ℃
Water solubility: Soluble in water, insoluble in alcohol and acetone.
Appearance: White to light brown crystals.
Hazard symbol: R36

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Physicochemical properties

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Sodium stannate

Sodium stannate is colorless hexagonal plate crystal or white powder. Soluble in water, the aqueous solution is alkaline, and the relative density of the aqueous solution is 1.438. Insoluble in alcohol and acetone 。 Loss when heated to 140 ℃ Crystal water And become Anhydrous substance 。 It is made by absorbing carbon dioxide in the air sodium carbonate and Tin hydroxide 。

And carbon dioxide The reaction produces sodium carbonate, which is dehydrated and decomposed at 140 ℃.^[1]

Main purpose

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Mainly used for Electroplating industry alkalinity Tinning And copper plating, and Tin alloy , zinc tin alloy, aluminum alloy and other alloys Electroless plating 。 Used in the textile industry Fire retardant , weighting agent. The printing and dyeing industry uses Mordant 。 It is also used in glass, ceramics and other industries.^[2]

Preparation source

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1. Alkali hydrolysis: melt the tin block into tin flakes by water quenching, and then mix with Caustic soda 、 Sodium nitrate Miscibility Reaction, the reaction temperature rises from 300 ℃ to 800 ℃ to generate sodium stannate, which is dissolved by cooling and adding water, and then Sodium sulfide 、 hydrogen peroxide After purification and impurity removal, precipitation, filtration, evaporation and concentration Centrifugal separation , drying and crushing to obtain sodium stannate products. Chemical equation For:

2Sn+3NaOH+NaNO three +6H two O→2Na two SnO three ·3H two O+NH three ↑^[1]

2、 Melting process : will cassiterite calcination After powder and sodium hydroxide Melt in the electric furnace for 15min, dissolve the product in water, boil, crystallize Recrystallization And other refining processes to obtain sodium stannate.

Properties and stability

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When heated to 140 ℃, the crystal water is lost and becomes anhydrous. It is made by absorbing carbon dioxide in the air sodium carbonate and Tin hydroxide 。