A passivation device and passivation method for preventing the dissolution of lead ions in lead-containing glass

Abstract

The invention discloses a passivation device and method capable of preventing lead ions in lead containing glass from being dissolved out. The passivation device comprises a passivated fused salt tank containing passivated fused salt, a heat preservation shell wrapping the passivated fused salt tank, and electric heating systems located between the heat preservation shell and the passivated fused salt tank. Lead containing glass is completely immersed in passivated fused salt, so that lead ions on the surface of the lead containing glass are replaced with zinc ions in passivated fused salt and then replaced with zinc blocks to obtain lead. The passivation device is small in size, low in unit energy consumption, little in pollution to the environment, high in automation degree and capable of continuously preparing the lead containing glass low in lead ion dissolution rate at a time, and therefore the comprehensive cost is reduced. By means of the passivation method, the Pb2+ dissolution on the surface of the lead containing glass can be greatly reduced; meanwhile, the content of Zn2+, Ca2+ and Mg2+ on the surface of the lead containing glass are increased, the passivated lead containing glass can meet more harsh use requirements, and the application range of the lead containing glass is greatly widened.

Description

technical field [0001] The invention relates to the technical field of processing lead-containing glass, in particular to a passivation device and a passivation method for preventing the dissolution of lead ions in the lead-containing glass. Background technique [0002] Leaded glass is a silicate glass containing lead oxide, a glass system based on silicon dioxide, lead oxide, boron oxide, potassium oxide, barium oxide, etc. In some binary glass systems composed of lead oxide and silica, the lead oxide content can even reach 80%, and still form glass stably. According to the content of PbO in the glass, lead-containing glass can be divided into three categories: high-lead glass, PbO content ≥ 30%, density ≥ 3.0g / cm 3 , refractive index ≥ 1.560; medium lead glass, PbO content ≥ 24%, density ≥ 2.90g / cm 3 , Refractive index ≥ 1.545; low lead glass, the Czech Republic stipulates that the PbO content is ≥ 7%, while the British and European standards stipulate ZnO, BaO, PbO, K ...

AI Technical Summary

Problems solved by technology

[0006] At present, there are mainly two ways to prevent the dissolution of lead ions: one is to use lead-containing glass in products with little contact with people; Reduced, the film will fall off after long-term use, and the glass is often processed first and then the film is attached. The film on the edge of the glass is not easy to fit tightly, and there is still a risk of lead ion pollution.

None of the existing approaches can fundamentally solve the problem of lead ion dissolution

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