Sodium aluminate Typical Properties
Items
Specifications
Appearance
White Powder
NaAlO2
≥85
AL2O3
≥53
Na2O
41±1
Na2O/ AL2O3
1.25±0.05
Fe
≤200
PH
≥12
Water Insoluble
≤1.0
Preparation of sodium metaaluminate from anhydrous
Sodium metaaluminate does not exist in solution, solid high temperature reaction can generate sodium metaaluminate
The compound produced by the reaction of metal aluminum and sodium hydroxide solution was considered to be NaAlO2, but scientific research has proved that the product is actually Na [Al (OH) 4] (sodium tetrahydroxyaluminate), which is a coordination compound.
To prepare sodium metaaluminate with the molecular formula NaAlO2, the method is to add activated alumina to molten sodium hydroxide. The product is sodium metaaluminate and water. The water evaporates in the form of gas. The equation is:
Al2O3 + 2NaOH = High temperature = 2NaAlO2 + H2O (g) ↑ (water vapor)
When co-melted dried alumina and sodium carbonate, sodium meta aluminate is formed [2]. The reaction equation is as follows:
Al2O3 + Na2CO3 = 2NaAlO2 + CO2
When hydrated alumina and sodium carbonate are heated to 950 ℃, sodium meta aluminate and sodium aluminate form (a) [2]
(a) 2Al2O3H2O + 2Na2CO3 → NaAlO2 + Na3AlO3 + Al2O3 + 2H2O ↑ + 2CO2 ↑
The latter generates sodium metaaluminate (b) when heated to 1200 ° C.
(b) NaAlO2 + Na3AlO3 + Al2O3═4NaAlO2 [2]
Sodium aluminate Application
This product is a mordant, water softener, is the manufacture of zeolite, opal glass and soap, analytical reagents. It is also widely used in pharmaceutical, rubber, printing and dyeing, textile, and catalyst production.
It can be used as cement quick-setting agent in civil engineering. This product is mixed with water glass for plugging during construction. It can make cement quickly condense. It is an ideal additive for underground, rapid construction and fast curing of cement.
In the paper industry, the combination of sodium aluminate and aluminum sulfate is a good filler, which can improve the pressure characteristics, the distance control of the rubber and the new printing machine; in the papermaking process, it can make the pulp quick set. The role is to replace the new product of the gel; it can increase the whiteness of the paper, make the paper surface smooth and smooth, and be more fluent in writing; it can increase the weight of the paper, increase the hardness of the paper, and not penetrate the paper during writing. .
In water treatment, it can be used as a water purifying agent to reduce the hardness of water, reduce turbidity, accelerate the sedimentation of suspended solids, and improve the separation conditions to accelerate the precipitation of hard ions to the insoluble aluminum hydroxide. Has a strong affinity, this property is used to treat boiler water in order to obtain very low silica impurity content and also used in the manufacture of coagulants to improve flocculation of clarified sewage with chalk, ferric chloride and polymeric media chemicals. The ability to flocculate the form of aluminum hydroxide accelerates the clarification process.
Reduce the viscosity of oil well water and protect the surface of steel in the petrochemical industry.
This product is used in the production of titanium dioxide to coat its surface and improve its properties.
Sodium aluminate Packaging and Shipping
Bags, 25kg
Sodium aluminate Storage
Treasury ventilation low temperature drying; and acid, ammonia salt stored separately.
