Introduction to M⁺FLO-Fe^ⅡCN Deep Cyanide Removal Water Purification Technology:

Cyanides in industrial wastewater exist in two primary forms: inorganic cyanides and organic cyanides. Inorganic cyanides include simple cyanides (such as HCN, CN-, and compounds like potassium cyanide, sodium cyanide, and ammonium cyanide) and complex cyanides (e.g., [Zn(CN)₄]^2-, [Cd(CN)₄]^2-, [Cu(CN)₄]^2-, [Fe(CN)₆]^2-). Organic cyanides, known as nitriles (e.g., acrylonitrile, acetonitrile), are not suitable for removal using the M⁺FLO-Fe^ⅡCN method.

Cyanides in water bodies primarily originate from industrial pollution, including industries such as electroplating, metallurgy, mining, coal chemical, petroleum refining, petrochemicals, dyes, leather tanning, pesticides, and synthetic fibers. Some cyanide-containing wastewater may also include derivatives like thiocyanates (SCN^-), which, at concentrations above 110 mg/L, can inhibit biological nitrification. Such cases may require the M⁺FLO-CuSCN method for removal.

Cyanides are strictly controlled pollutants in wastewater discharge and are also valuable resources, especially when present in high concentrations. Europe recommends a resource recovery and deep removal approach, utilizing the efficient precipitation CP+Fe^ⅡCN cyanide removal and purification technology. This method is based on the chemical principle: 3Fe²⁺ + 6CN^- = Fe₂[Fe(CN)₆] ↓ (Ksp=10^^-35). By adding Fe²⁺ and employing chemical reduction, the complex crystallization reaction generates ferrous ferrocyanide (a white precipitate), which, after efficient precipitation and clarification, achieves deep cyanide removal. This process meets the GB3838-2002 surface water standard (CN^- < 0.2 mg/L) and can be further enhanced for higher standards, such as drinking water (CN^- < 0.02 mg/L), by using chemical oxidation to convert residual cyanide into CO₂ and N₂. The cyanide precipitate can be recovered as a cyanide resource.

The M⁺FLO-Fe^ⅡCN magnetic flocculation + chemical deep cyanide removal water purification system is an upgraded version of the European CP+Fe^ⅡCN method. The enhanced technology offers significant advantages, including improved efficiency and resource recovery capabilities.:

Cyanides in industrial wastewater exist in two forms: ① inorganic cyanides and ② organic cyanides. Inorganic cyanides include simple cyanides (such as HCN, CN^-, and compounds like potassium cyanide, sodium cyanide, ammonium cyanide) and complex cyanides (such as [Zn(CN)₄]^2-, [Cd(CN)₄]^2-, [Cu(CN)₄]^2-, [Fe(CN)₆]^2-). Organic cyanides, known as nitriles (e.g., acrylonitrile, acetonitrile), are not suitable for removal by the M⁺FLO-Fe^ⅡCN method. Cyanides in water primarily originate from industrial pollution, including wastewater from electroplating, metallurgy, mining, coal chemical, oil refining, petrochemical, dye, tanning, pesticide, and synthetic fiber industries (some cyanide-containing wastewaters may also contain derivatives like thiocyanates, SCN-, which can inhibit biological nitrification at concentrations >110mg/L and can be removed using the M⁺FLO-CuSCN method). Cyanides are strictly controlled pollutants in wastewater discharge and are also valuable resources, especially when present in high concentrations. Europe recommends a resource recovery and deep removal approach—the efficient precipitation CP+Fe^ⅡCN cyanide removal and purification technology, based on the chemical principle: 3Fe2+ + 6CN- = Fe2[Fe(CN)6] ↓ (Ksp=10^-35). Depending on the characteristics of the cyanide-containing wastewater and treatment requirements, Fe2+ is added, and chemical reduction controls the complex crystallization reaction to form ferrous ferrocyanide (white precipitate). After efficient precipitation and clarification, deep cyanide removal can be achieved (meeting the GB3838-2002 surface water standard III CN- <0.2mg/L; for higher standards like drinking water CN- <0.02mg/L, chemical oxidation can further oxidize residual cyanide to CO₂ and N₂). The cyanide precipitate can be recovered as a resource. The M⁺FLO-Fe^ⅡCN magnetic flocculation + chemical method deep cyanide removal water purification system (process flow diagram below) is an upgraded version of the European CP+Fe^ⅡCN method, with the following technical advantages:

Translation:

1.The TTmix turbine/guide tube high-circulation intensification reactor significantly improves the efficiency of chemical cyanide removal reactions and enhances the rapid coagulation/crystallization of precipitate particles.

2.M⁺FLO magnetic flocculation sedimentation replaces the efficient precipitation CP, greatly improving the performance and efficiency of flocculation water treatment. It not only enables the resource recovery of cyanide from wastewater but also meets deep cyanide removal standards (effluent cyanide content <0.2mg/L).

Process Flow of M⁺FLO-Fe^ⅡCN Deep Cyanide Removal Water Purification System:

High-cyanide wastewater is fed into the TTmix high-circulation intensification reactor, where cyanide removal agents/Fe2+ are added, and appropriate reaction parameters are controlled. Efficient reactions generate precipitate particles, which rapidly coagulate/crystallize. The mixture then flows into the M⁺FLO magnetic flocculation sedimentation system, where efficient magnetic flocculation and sedimentation clarification occur. The effluent fully meets deep cyanide removal standards, and the cyanide precipitate can be recovered as a resource.

Performance and Advantages of M⁺FLO-Fe^ⅡCN Deep Cyanide Removal Water Purification System:

Efficient and deep cyanide removal, with effluent cyanide content <0.2mg/L (or <0.02mg/L with chemical oxidation) and turbidity <1.0NTU.

The TTmix high-circulation intensification reactor significantly improves the efficiency of chemical complex precipitation reactions and the rate of coagulation/crystallization.

M⁺FLO magnetic flocculation sedimentation replaces efficient precipitation CP, greatly enhancing the performance and efficiency of flocculation water treatment.

Compared to the European CP+Fe^ⅡCN chemical cyanide removal/recovery technology, it offers higher treatment efficiency and performance, along with advantages such as lower investment, reduced operating costs, and PLC intelligent automatic control.

Typical Applications of M⁺FLO-Fe^ⅡCN Deep Cyanide Removal Water Purification System:

Removal of cyanides from wastewater in metallurgy, mining, and electroplating industries.

Removal of cyanides from industrial wastewater in coking, coal chemical, oil refining, petrochemical, dye, tanning, and pesticide industries.

Cyanide removal and flocculation sedimentation pre-purification treatment in surface water sources for water plants.

Case Studies of M⁺FLO-Fe^ⅡCN Deep Cyanide Removal Water Purification System:

The cyanide content in wastewater from the catalytic cracking and coking units of Hainan Dongfang Petrochemical sometimes increases significantly due to changes in the origin of crude oil, leading to severe exceedance of cyanide levels in the discharged water by several times (the discharge standard for cyanide is<0.5 mg/L). After extensive experimentation and evaluation of various cyanide removal technologies, the M⁺FLO-Fe^ⅡCN deep cyanide removal water purification system was selected for the final treatment of the tailwater. The system has been operating stably, with the treated water containing cyanide levels below 0.2 mg/L and turbidity below 1.0 NTU.