Low-iron glass for solar thermal power generation and preparation method thereof

By using specific raw material ratios and gradient melting processes, the problems of transmittance and bubble defects in low-iron glass for solar thermal power generation were solved, achieving the preparation of glass with high transmittance and low bubble content, thus meeting the needs of solar thermal power plants.

CN120965103APending Publication Date: 2025-11-18FUJIAN RUIBO GLASS CO LTD
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Patent Information

Application Number
CN202511196317.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-26
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing technologies struggle to improve the direct solar transmittance of low-iron glass for solar thermal power generation while ensuring mechanical strength, chemical stability, and appearance quality. Furthermore, the glass suffers from numerous bubble defects, resulting in glass quality that fails to meet the requirements of power plants.

Method used

Using low-iron quartz sand, low-iron dolomite, low-iron limestone, soda ash, potassium aluminate, potassium magnesium alum, potassium bismuthate, and cerium oxide as raw materials, the introduction of impurity metal elements is controlled through gradient melting and clarification treatment under an oxidizing atmosphere. The synergistic effect of potassium magnesium alum, potassium bismuthate, and cerium oxide is utilized to extend the temperature range of the clarification process and reduce bubble defects.

Benefits of technology

This improved the direct solar transmittance of the glass, reduced the Fe2+ concentration, decreased bubble defects, and achieved a highly efficient glass clarification effect, meeting the industrial production requirements of low-iron glass for solar thermal power generation.

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Abstract

The invention relates to low-iron glass for solar thermal power generation and a preparation method of the low-iron glass. Comprising the following steps: uniformly mixing 58.5 to 60 parts by weight of low-iron quartz sand, 12 to 15 parts by weight of low-iron dolomite, 3.5 to 6 parts by weight of low-iron limestone, 18.5 to 20 parts by weight of sodium carbonate, 1.7 to 2.1 parts by weight of potassium metaaluminate, 0.55 to 1.15 parts by weight of kainite, 0.25 to 0.5 part by weight of potassium bismuthate and 0.06 to 0.14 part by weight of cerium oxide to obtain a mixture; the mixture is put into a kiln to be melted, the melting temperature is set in a gradient mode, the oxidizing atmosphere is kept, and molten glass is obtained; clarifying, homogenizing, cooling, forming, annealing and cutting the molten glass to obtain the low-iron glass for solar thermal power generation. The low-iron glass for solar thermal power generation has higher sunlight direct transmittance and lower bubble defect number.
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