M⁺FLO-RSi High-Efficiency & Deep De-Siliconation Technology Overview:

Silicon is a chemically active element and does not exist in its free state in nature. Inorganic silicon is one of the most complex inorganic substances in water, existing in forms such as colloidal silicon or dissolved silicon (also known as active silicon). Colloidal silicon refers to silicic compounds in water that exist in a multi-molecule aggregated state, while dissolved silicon refers to silicic compounds in water that exist in ionic or single-molecule forms. The presence of silicic compounds in water is influenced by factors such as their concentration, temperature, and pH value. Silicate ions in water easily form magnesium silicate scale (Mg3Si2O5(OH)4), also known as serpentine-like scale, which is difficult to clean. Therefore, certain industrial water quality requirements necessitate controlling silicon content within permissible limits. For example:

Reverse Osmosis (RO)/DTRO feedwater: SiO2 < 25 mg/L (concentrate side SiO2 < 100 mg/L).

Industrial circulating cooling water: Mg2+ * SiO2 < 50,000 mg/L (Mg2+ expressed as CaCO3), silicate content < 175 mg/L.

The CP-RSi chemical precipitation de-siliconation technology, originating from Europe, is based on extensive experimental data and engineering applications. Its core lies in optimizing process package parameters and combining them with efficient reactors. The technology incorporates three process packages:

1.Calcium-based chemical crystallization precipitation process.

2.Magnesium-based chemical adsorption co-precipitation process.

3.Aluminum-based chemical adsorption co-precipitation process.

The CP-RSi technology demonstrates significant advantages, including high efficiency, cost-effectiveness, reduced reagent consumption, and minimal sludge production. It also addresses technical challenges such as high reagent consumption in magnesium-based de-siliconation and high aluminum residue in alum-based de-siliconation.

The M+FLO-RSi de-siliconation process is an upgraded version of the CP-RSi technology, where M+FLO magnetic flocculation perfectly replaces the CP precipitation process. This upgrade enhances treatment efficiency and achieves deep de-siliconation (silicon < 3.0 mg/L).

For more details, please refer to the M+FLO-RSi de-siliconation process flow diagram below.

M⁺FLO-RSi De-Siliconation Technology Performance & Advantages:

The optimized process parameters combined with the TT+R high-efficiency reactor ensure efficient and thorough reactions, resulting in reduced reagent consumption, minimal sludge generation, and lower treatment costs. This technology achieves deep de-siliconation, capable of reducing silicon content to below 3.0 mg/L.

It addresses the limitations of traditional methods, such as high reagent consumption in magnesium-based de-siliconation and high aluminum residue levels in sodium aluminate de-siliconation.

The system features intelligent automatic control, simplifying operation and eliminating the need for constant supervision.

M⁺FLO-RSi De-Siliconation Case Study:

After evaluating several hardness and silicon removal technologies, the user and design institute selected the M+FLO-RSi synchronous hardness and silicon removal process (using hardness removal reagents such as NaOH/Na?CO? and magnesium-based silicon removal agents). The system was commissioned in 2019, operates stably, and achieves excellent treatment performance, with effluent water quality significantly exceeding design specifications: total hardness ≤ 60 mg/L and silicon ≤ 5.0 mg/L.