High-purity Low-iron Dolomite: The Key Raw Material for Enabling Efficient Photovoltaic Glass

I. The strategic value of dolomite in photovoltaic glass

In the photovoltaic industry chain, photovoltaic glass, as a crucial encapsulation material for solar cell components, its light transmittance, mechanical strength and weather resistance directly determine the photoelectric conversion efficiency and the lifespan of the components. Calcite, as a dual-functional mineral raw material that provides both magnesium oxide (MgO) and calcium oxide (CaO), is an indispensable core component in the formulation of photovoltaic glass.

Figure 1.1 Real scene of photovoltaic glass kiln melting process

Figure 1.2 Finished Product of Solar Cell Module

 Figure 1.3 Schematic Diagram of Double-Glass Module Cross-section

II. Our company's high-purity dolomite product parameters and competitive advantages

In response to the strict requirements of the photovoltaic glass industry for raw materials, our company selects high-quality mineral sources and, through advanced mineral processing and deep processing techniques, produces high-purity, low-iron dolomite products that meet the standards for photovoltaic applications.

Figure 2.1 - 2.3 Actual photos of high-purity low-iron dolomite

Key performance highlights

1. Extremely low iron content, ensuring high light transmittance

The content of Fe₂O₃ is only 0.007 - 0.013%. Iron impurities are the "number one killer" of the light transmittance of photovoltaic glass. For every 10 ppm reduction in iron content, the visible light transmittance can increase by approximately 0.05% - 0.1%. It is suitable for the production of ultra-white rolled photovoltaic glass with a light transmittance of ≥ 91.5%.

2. High purity two-component, with strong formula stability

The CaO/MgO ratio is approximately 1.57, which is close to the theoretical stoichiometric ratio of dolomite (1.68). The melting reaction was uniform, and the loss on ignition was as high as 47.13%, indicating that the carbonate mineral phase was pure and the decomposition products were purewithout any residues.

3. Ultra-low impurity series

The contents of SiO₂, Al₂O₃, K₂O and TiO₂ are all controlled below 0.01%, to prevent the introduction of extrinsic ions outside the network and to ensure the integrity of the glass structure and its long-term weather resistance.

III. Epilogue

As the core raw material of photovoltaic glass, the quality of dolomite directly affects the photoelectric performance of the final product. Our high-purity low-iron dolomite, with an ultra-high Fe₂O₃ content of ≤0.013%, an excellent CaO/MgO ratio, and a pure quality with an impurity spectrum lower than 0.01%, provides stable and reliable raw material support for photovoltaic glass manufacturers.

Choosing high-quality dolomite means choosing higher light transmittance, lower energy consumption and longer component lifespan. We look forward to cooperating with you to jointly promote the high-quality development of the photovoltaic industry. If you would like to learn more about the dolomite products or have any cooperation inquiries, please feel free to contact our professional team.