A method and apparatus for recovering sodium slag

By mixing dispersants, controlling oxygen roasting, and segmented roasting of liquid sodium slag, combined with leaching with water or sodium hydroxide solution, the safety and resource utilization issues of sodium slag treatment are solved, and the efficient recovery and high-value utilization of sodium slag are achieved.

CN117210701BActive Publication Date: 2026-06-05BEIJING UNIV OF CHEM TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Filing Date
2022-06-02
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the safe and effective treatment and recycling of sodium slag, resulting in its low price and potential safety hazards. Furthermore, the sodium slag contains a large amount of usable metallic sodium and calcium resources that are not being effectively utilized.

Method used

By mixing liquid sodium slag with a dispersant and then subjecting it to controlled oxygen roasting, the roasting process is controlled in stages. Subsequently, the slag is crushed and leached with water or sodium hydroxide solution to achieve oxidation and separation of the sodium slag, yielding sodium hydroxide solution and calcium hydroxide.

Benefits of technology

This method enables the safe and efficient recycling of sodium slag, converting it into valuable sodium hydroxide solution and calcium hydroxide. It solves the safety and resource utilization problems of sodium slag treatment and enhances the economic value of sodium slag.

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Abstract

The application relates to the field of sodium metal production, and discloses a sodium residue recovery method and device. The sodium residue recovery method comprises the following steps: (1) first roasting liquid sodium residue to obtain first roasting residue; (2) crushing the first roasting residue and then second roasting to obtain second roasting residue; (3) using water or sodium hydroxide solution to leach the second roasting residue to obtain sodium hydroxide solution and calcium hydroxide; and the method optionally comprises: mixing the liquid sodium residue with a dispersing agent before first roasting. The sodium residue roasting-leaching recovery method and device are safe and controllable, sodium residue is converted into valuable sodium hydroxide solution and calcium hydroxide solid, and high-value utilization of the sodium residue is realized.
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