Method for co-processing and recycling of mother liquor after bromine extraction

By using segmented neutralization processes and parameter control, the synergistic treatment and resource recovery of bromine extraction mother liquor were achieved, solving the problems of untargeted recovery of calcium and magnesium resources and secondary pollution, reducing processing costs, and improving resource utilization and environmental protection.

CN122233601APending Publication Date: 2026-06-19TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
Filing Date
2026-05-13
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing bromine extraction mother liquor treatment technologies, industrial waste is difficult to be disposed of in conjunction with other processes, calcium and magnesium resources cannot be recovered efficiently and in a targeted manner, reducing agents need to be added, which can easily cause secondary pollution, and water resource utilization is low and treatment costs are high.

Method used

A segmented neutralization process is adopted, using refined ammonia stripping waste liquid and light calcined powder suspension for directional precipitation. Combined with flocculants and chelating agents, the dosage of alkaline neutralization liquid is dynamically controlled through a parameter correlation model to achieve directional precipitation of calcium and magnesium ions and decay of residual chlorine. Subsequently, high-purity products and qualified effluent are obtained through solid-liquid separation and deep purification treatment.

Benefits of technology

This system enables high-value recovery of calcium and magnesium resources, reduces processing costs, avoids secondary pollution, improves water resource utilization, forms a closed-loop recycling system, and meets environmental protection requirements.

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Abstract

This invention relates to the field of mother liquor treatment and resource recovery technology after bromine extraction, and provides a method for the co-treatment and resource recovery of mother liquor after bromine extraction, including pretreatment: introducing the bromine extraction mother liquor into a pretreatment tank, adding a flocculant for flocculation and sedimentation to remove suspended impurities and obtain a clarified mother liquor; and first-stage neutralization: pumping the clarified mother liquor into a first-stage neutralization reactor, adding ammonia-refined waste liquid at a volume ratio of 1:(250-400), controlling the reaction temperature at 25-35℃, the stirring rate at 200-300 r / min, reacting for 20-30 min, and adjusting the pH of the mother liquor to 5.5-6.5 to initially neutralize the acidity and reduce some of the residual chlorine. The ammonia-refined waste liquid is used as the alkaline neutralizing liquid in the first-stage neutralization. After being purified by hydrocyclone separation and ceramic membrane filtration, the carbonate, bicarbonate, and other components contained in the ammonia-refined waste liquid can react with the hydrogen ions in the bromine extraction mother liquor to achieve initial acidity neutralization and partial reduction of residual chlorine, while simultaneously providing carbonate raw materials for subsequent calcium and magnesium precipitation.
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