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001×7FG is a gel-type strongly acidic cation-exchange resin with polystyrene matrix and sulfonic acid groups, acting as solid sulfuric acid. It is mainly applied in food-grade water treatment industries.
Appearance: Light-yellow transparent spherical beads
Functional group: -SO₃H
Shipping form: Na⁺ form
Total exchange capacity: ≥4.5 mmol/g
Volume exchange capacity: ≥1.9 mmol/ml
Moisture content: 45%~50%
True wet density: 1.25~1.29 g/ml
Bulk wet density: 0.77~0.87 g/ml
Particle-size range: 0.315~1.25 mm
Effective particle size: 0.40-0.70 mm
Uniformity coefficient: ≤1.6
Sphericity after osmotic-abrasion test: ≥60%
Color: ≤25 APHA
Maximum operating temperature: 120 °C
Resin bed depth: 1~3 m
Service flow rate: 2~10 BV/h
Backwash flow rate: 4~10 BV/h
Regeneration (desorption) flow rate: 1~2 BV/h
Regenerant dosage: 2 BV of 3-5 % HCl; 2 BV of 2-4 % NaOH
Water softening
Pure water preparation
Hydrometallurgy
Separation of rare elements
1. Transportation and Storage
Store the resin in wet condition at temperature preferably above 0 °C. For long-term idle storage, seal the container or immerse the resin in brine of ≥5 % concentration. Protect the resin against freezing during transportation. Do not place heavy loads on top of resin packages to prevent bead crushing.
2. Resin Pretreatment
A basic pretreatment cycle follows the sequence: alkali treatment → water rinse → acid treatment → water rinse. For stringent requirements, repeat this cycle three times, and finally convert the resin to the target ionic form.
3. Resin Loading
Reserve sufficient free space considering volume expansion upon ionic transformation to avoid overflow and maintain proper liquid level. Adopt a reasonable column-to-bed-diameter ratio to prevent channeling. Load resin by wet-packing, or perform backwashing to expel air trapped within the resin bed.
4. Feed liquid entering the resin column shall be pretreated by flocculation, filtration or sand filtration to remove suspended solids and avoid pore clogging of resin beads.
5. For long-term shutdown of resin columns, take out well-rinsed resin for separate storage; alternatively keep resin submerged in salt-containing anti-saline medium and never allow resin dehydration. Perform intermittent backwashing to loosen resin bed and prevent caking which may render resin unusable.
