Sodium fluosilicate sewage treatment system

Through the precipitation, filtration, decomposition and concentration steps of the sodium fluorosilicate sewage treatment system, the sludge, consumption and cost problems in the wastewater treatment of sodium fluorosilicate production are solved, and the recycling and zero emission of wastewater resources are achieved.

CN223280730UActive Publication Date: 2025-08-29湖北宜化氟化工有限公司
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Patent Information

Application Number
CN202422527838.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-18
Publication Date
2025-08-29
Estimated Expiration
2034-10-18

AI Technical Summary

Technical Problem

The wastewater generated in the sodium fluorosilicate production process is difficult to treat, and a large amount of hazardous waste sludge is generated. The consumption of sludge is large, the wastewater treatment cost is high, the water consumption is large, and the sodium sulfate loss is high, which increases production cost.

Method used

The sodium fluorosilicate sewage treatment system is adopted, including sodium fluorosilicate wastewater tank, sludge precipitation tank, multi-media filter, ultrafiltration UF impurity removal device, resin softening secondary hardening device, nanofiltration NF device and concentrated water evaporation MVR device. Through precipitation, filtration, impurity removal, hardening and concentration steps, zero emission of wastewater and resource recovery are achieved.

Benefits of technology

It reduces the amount of sludge and treatment difficulty, reduces the amount of sludge and water consumption, realizes zero emissions of wastewater and the recycling of sodium sulfate, and reduces production costs.

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Abstract

The utility model discloses a sodium fluosilicate sewage treatment system, which is characterized in that sodium fluosilicate wastewater is subjected to fluorine removal and phosphorus removal, then sodium carbonate or sodium hydroxide is added, SO4 < 2-> in the wastewater is converted into a sodium sulfate solution, the wastewater is subjected to hardness removal treatment, then is subjected to ultrafiltration and nanofiltration membrane filtration, concentrated water containing the sodium sulfate solution is recovered to a sodium sulfate collection tank, and the sodium fluosilicate sewage is obtained. Produced water is recycled as replenishing water of the device, so that zero discharge of sewage can be realized.
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