Softening resinIt is a specialized resin designed for softening hard water.Softening resinGeneral filling andFiberglass tankBody or stainless steel tank body, combined with accessories such as multi way valvesWater softening equipmentSoftening resin is essentially a type ofion exchange resinThe commonly used softening resins include 001 * 7 sodium type strong acid cation resins from brands such as Piaolet, Rohm and Haas, and Zhengguang. Through the principle of ion exchange, the hardness of water is reduced to less than 50 mg/L (CaCO3).

The purpose of softening resin
At present, more than half of ion exchange devices are used for water treatment desalination, and the main methods for water treatment desalination are strong acidic hydrogen cation exchange resins and strong alkaline hydrogen oxygen anion exchange resins. When hydrogen cation exchange resin comes into contact with water, an ion exchange reaction occurs, and various cations in water are adsorbed on the resin, while the hydrogen ions bound to the cation resin are exchanged. At this time, the water only contains one cation, hydrogen ions. When the hydroxide anion resin comes into contact with water and undergoes an ion exchange reaction, various anions in the water are adsorbed, resulting in only one hydroxide ion in the water. When the water passes through this hydroxide cation resin and then through the hydroxide anion resin, only two types of cations and anions (hydrogen ions and hydroxide ions) will combine to form water, completing the desalination process of water.

Principle of resin regeneration
When the soft water resin replaces a certain amount of hardness ions such as calcium and magnesium in the water, it will no longer be able to soften the water. At this time, a water softener is needed for resin regeneration, which is the reduction regeneration method after resin calcium pollution. This method uses a saturated concentration of sodium ion solution to soak and wash the softened resin. At this point, the calcium and magnesium ions carried in the ion exchange resin will exchange with sodium ions, and then be removed by flushing with water flow. When regenerating strong cation exchange resin with Na solution, it is advisable to adopt a stepwise regeneration method. Start regenerating with a low concentration Na solution, as the Ca2+concentration desorbed from the resin is high at this time, but the Na concentration is low. Even if a small amount of Ca2+Na precipitate is formed, it will be washed away by the solution. Then gradually increase the Na concentration, at which point the Ca2+concentration desorbed from the resin is low and no Na precipitation will form.

Physical and chemical performance indicators of softened resin

Moisture content: 45-53% Mass exchange capacity: ≥ 4.4mmol/g (dry)

Volume exchange capacity: ≥ 1.7mmol/ml Wet visual density: 0.77-0.87g/ml

Wet true density: 1.24-1.28g/ml range Particle size (0.315-1.25mm): ≥ 95%

Lower limit particle size (<0.315mm): ≤ 1% Effective particle size:<0.40mm

Uniformity coefficient: ≤ 1.6

Reference indicators for use

PH range: 0-14

Usage temperature: Sodium type: ≤ 120 ℃ Chlorine type: ≤ 100 ℃

Transformation expansion rate (Na+H+): ≤ 10%

Industrial resin layer height: 1.0-3.0M

Regeneration solution concentration NaCl: 4-10%, HCl: 2-5%, H2SO4: 1-2%, 2-4%

Regenerator dosage (calculated at 100%) NaCl (industrial): 75-150Kg/m3, HCL (industrial): 40-100Kg/m3, H2SO4 (industrial): 75-150Kg/m3

Regeneration liquid flow rate: 5-8m/h

Regeneration contact time: 30-60 minutes

Positive washing flow rate: 10-20m/h

Washing time:~30min

Operating flow rate: 10-40m/h

Work exchange capacity, NaCl regeneration: ≥ 1000mmol/L (wet), HCL regeneration: ≥ 1350mmol/L (wet)