A separation process for a mixed salt containing rubidium nitrate and sodium nitrate

By separating rubidium nitrate and sodium nitrate using precipitation and evaporation concentration methods guided by ternary phase diagrams, the problem of separating complex mixed salts has been solved, achieving efficient and environmentally friendly resource recycling.

CN118026226BActive Publication Date: 2026-06-30TIANJIN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIV OF SCI & TECH
Filing Date
2022-11-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the efficient separation and purification of complex mixed salts of rubidium nitrate and sodium nitrate (NaNO3 + NaNO3·2RbNO3), leading to difficulties in resource recycling.

Method used

Using a ternary system (RbNO3-NaNO3-H2O) phase diagram-guided precipitation and evaporation concentration methods, rubidium nitrate and sodium nitrate are separated by controlling temperature and water volume, and wastewater and waste residue are reduced by recycling the mother liquor.

Benefits of technology

It achieves efficient separation of rubidium nitrate and sodium nitrate, with high product purity, simple and reliable process, suitable for industrial production, and environmentally friendly with no waste discharge.

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Abstract

This invention discloses a separation process for a mixed salt containing rubidium nitrate and sodium nitrate. Based on the ternary system (RbNO3-NaNO3-H2O) phase diagram, the process achieves the separation of rubidium nitrate and sodium nitrate by utilizing the salt precipitation pattern during heating and cooling. The two circulating mother liquors (E2 and E3, or E1 and E3) can be recycled in the production process, resulting in no wastewater or waste residue discharge. The rubidium nitrate and sodium nitrate obtained by this method have high purity, and the process is simple to operate, environmentally friendly, stable, and reliable, making it suitable for industrial production.
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