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Flame retardant wastewater evaporation treatment process
Flame retardant wastewater evaporation treatment process
Flame retardants
Flame retardants, functional additives that give flame-retardant properties to flammable polymers, are mainly designed for flame retardancy of polymer materials; there are various types of flame retardants, which are divided into additive flame retardants and reactive flame retardants according to the method of use.
Additive flame retardants are added to the polymer by mechanical mixing method to make the polymer flame retardant. At present, there are mainly organic flame retardants and inorganic flame retardants, halogen flame retardants (organic chlorides and organic bromides) and non-halogen. Organic are some flame retardants represented by bromine, phosphorus and nitrogen, nitrogen and red phosphorus and compounds, and inorganic are mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and other flame retardant systems.
Flame retardant wastewater characteristics
1)Bromine flame retardants
The main high saline water produced by the brominated flame retardant process is sodium chloride salt, and the raw water quality of the brominated flame retardant wastewater of the project is as follows:
Raw water PH:7-8; density 1.020g/ml; COD:19000mg/L; salinity:2.8%; conductivity:57.95ms/cm; TDS:29.05g /L; chloride ion:11.7g/L; hardness:32mg /L (in terms of calcium ion);
The hardness of the original water is low, but the organic matter is high, so the influence of organic enrichment on the evaporator needs to be considered in the evaporation process.
2)Aluminum flame retardant
The main salt of aluminum-based flame retardant production wastewater is sodium sulfate salt, which contains a small amount of zinc borate. Zinc borate affects sodium sulfate crystallization in the evaporation process, resulting in a smaller crystal size, and the centrifuge leaks material seriously at a later stage, so it is necessary to control the content of zinc borate in the system to ensure the stable operation of the salt discharge system.
Flame retardant wastewater evaporation treatment process
For bromine flame retardants, PH adjustment + flocculation precipitation + MVR evaporation crystallization + single-effect evaporation treatment process is adopted, and the process is reasonably arranged with the actual situation that the effluent PH of the production process is low and there is flocculation precipitation in the process of PH adjustment;
For the aluminum flame retardant, the preheating system + MVR evaporation crystallization + curing system is used to fully consider the influence of zinc borate on the formation of sodium sulfate crystals.
Flame retardant wastewater evaporation treatment process
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