Where is chromium in glass from?
Chrominum in glass is produced by adding chrominum compounds.
We can add chrominum compounds as pigment into glass.For example adding chromite flour(main component is Cr2O3) to make green glass;adding CrO3 to make red glass.
The adding amount of chrominum compounds decides the color saturation.
Before the traditional added chrominum compounds in glass are chrome green,sodium dichromate,potassium dichromate etc,but at present,we use chromite flour instead of those traditional chrominum compounds,which can reduce cost and improve production efficiency.
Why chromite flour can be added in glass as colorant widely,except its chrominum,it also has the following properties:
– Stable at high temperatures
– Thermal-shock resistant
– Resistant to corrosive glasses and slags
– High heat resistance
Zhengzhou haixu abrasives co.,ltd,as manufacturer and exporter of chromite flour,our chromite flour specification is as follows:
| Item | Unit | Index |
| Cr2O3 | % | ≥44.0% |
| SiO2 | % | ≤2.0% |
| FeO | % | ≤26.5% |
| CaO | % | ≤0.30% |
| MgO | % | ≤10.0% |
| Al2O3 | % | ≤15.5% |
| P | % | ≤0.003% |
| S | % | ≤0.003% |
| Cr/Fe | 1.55:1 | |
| Bulk Density | g/cm³ | 2.5-3 |
| Color | / | Black |
| PH | / | 7-9 |
| The amount of the acid | / | ≤ 2 ML |
| Percent soil | % | ≤0.1 |
| Percent Moisture | % | ≤0.1 |
| The sintered | ℃ | 1600 |
| Percentage of free acid present in the sand | % | 0 |
| filling density | g/cm³ | 2.6 |
| sintering point | °C | > 1,800 |
| melting temperature | °C | 2,180 |
The sizes we can produc are 200mesh 325mesh 400mesh 500mesh 600mesh 800mesh 1000mesh 1200mesh 1500mesh 2000mesh 2500mesh etc
