Specification :

The Nepheline Syenite can be used in float glass, container glass, fibre glass, opal glass, sheet glass, electrical glass and tableware glass. Nepheline Syenite provides necessary additions of alumina and alkali in the glass batch. It has low in silica and contains no free quartz. It also has a favorable ratio of sodium oxide to potassium oxide of 2: 1. Nepheline Syenite makes glass batches to have lower viscosity and easier workability compared with Potash Feldspar. Its high alumina and alkalis content also makes it so suitable for the glass manufacturing.
In the glass batch, alumina acts as a matrix of stabilizer, enhancing the workability of molten glass, and increasing the resistance for scratching, breaking and chemical protection. The alkali acts as a flux agent, lowering the melting temperature of the batch and consequently reducing the quantity of high cost soda ash that has to be added. As a result, the lower fusion point of Nepheline Syenite lowers the melting temperature of the glass batch, which speeds up the melting process, improves and creates a high productivity, and in addition it saves a tremendous amount of fuel.
Compare with Feldspar, the advantages of Nepheline Syenite are listed as follows: -
1. The content of potassium and sodium is high in Nepheline Syenite, and it can partly replace the soda ash in glass batches.
2. The characteristic of Foidal minerals are they will not intergrow with quartz. They can decrease the melting temperature with reaction between Nepheline Syenite and quartz in glass furnace. The melting temperature would be 40° C lowered than Feldspar.
3. The content of Al2O3 is high and the content of SiO2 is low in Nepheline Syenite. So it can save the cost of transportation of Al2O3.
4. It can decrease the content of Fe2O3 in glass.
Specification:
A series:
Fe2O3d0.35%
SiO2: 38-42%
Al2O3: 28-32%
CaO: 5-7%
K2O: 4 -6%
Na2O: 12-15%
MgO: 0.1-0.4%
sizes: 60-180 mesh
packing: 50kg/ pp bag

B series:
Fe2O3d0.25%
SiO2: e61%
Al2O3: e21% %
CaO: d0.25%
K2O: 5.3% e
Na2O: 12-15%
MgO: 9.3% e
sizes: 60-180 mesh
packing: 50kg/ pp bag