Advanced treatment method and system for circulating ash water in coal chemical industry

By employing an advanced reduction-advanced oxidation combined process and graded crystallization technology, the complexes in coal chemical ash water are broken down to generate high-value products. This solves the problems of hardness ions and dispersant accumulation, achieving efficient and stable ash water treatment and resource utilization.

CN121609469APending Publication Date: 2026-03-06QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES) +1
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Patent Information

Application Number
CN202512044130.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-06

AI Technical Summary

Technical Problem

In existing coal chemical production, the addition of organophosphorus scale inhibitors and dispersants to suppress scaling leads to the accumulation of hardness ions and dispersants in the circulating water, resulting in water waste, dispersant pollution, and low efficiency of subsequent deep treatment units. Furthermore, conventional deammoniation technology is susceptible to damage from oxidants and microorganisms.

Method used

An advanced reduction-advanced oxidation combined process was used to break down the complex, and combined with graded crystallization and fouling-resistant hydrophobic membrane technology, calcium, magnesium ions and ammonia nitrogen were recovered separately to generate high-value products, solving the problems of complex stability and deammoniation.

Benefits of technology

It achieves efficient removal of hardness and dispersants, resource recovery of calcium, magnesium and ammonia, effluent water quality meets standards, system operates stably, and reduces costs and pollution risks.

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Abstract

The invention belongs to the technical field of coal chemical industry grey water treatment, and particularly relates to an advanced treatment method and system for coal chemical industry grey water circulating water. The method integrates pretreatment, complexing cracking, fractional crystallization and deep deamination, and is characterized in that a chelating structure of an organic phosphorus dispersing agent and calcium and magnesium ions is thoroughly destroyed through an advanced reduction-advanced oxidation combined process, target ions are released, and the core problems that hardness removal is hindered and phosphorus pollution is caused are solved; then, calcium and magnesium are respectively converted into calcium carbonate and magnesium ammonium phosphate particles for resource recovery by utilizing a secondary crystallization technology, so that the bottlenecks of high alkali liquor consumption and salt accumulation of a traditional high-pH magnesium ion precipitation method are broken through; and finally, the residual ammonia nitrogen is deeply removed by adopting a pollution-resistant PTFE hydrophobic membrane, so that the residual ammonia nitrogen is efficiently and stably removed, and the problem that a traditional polypropylene material membrane system is easy to pollute and block, easy to oxidize and difficult to apply to the field is solved.
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