SULFATE ANTISCALANTS FOR INDUSTRIAL PLANTS
Sulfate antiscalants are specialty chemicals that inhibit nucleation and crystal growth of:
- Calcium sulfate (CaSO₄)
- Barium sulfate (BaSO₄)
- Strontium sulfate (SrSO₄)
They are critical where sulfate cannot be fully removed upstream.
Reverse Osmosis (RO) feed & reject
Multi-Effect Evaporators (MEE)
MVR evaporators
Boilers & heat exchangers
Power plant FGD blowdown treatment
ZLD thermal systems
- Calcium sulfate inhibition index
- Barium sulfate tolerance
- Thermal stability (>120–180°C)
- pH operating range (5–9)
- Compatibility with coagulants & biocides
- Thermax Chemicals
- Nalco Water (Ecolab)
- Ion Exchange (India) Ltd
- Chembond Chemicals
- Chemtex Speciality
- Veolia Water Technologies
- Kurita Water Industries
- Solenis
- BASF (polymer chemistry)
₹250–600 per kg
Chemical cost impact: ₹3–12 per m³
If sulfate > 3,000–5,000 mg/L, combine antiscalants with:
- Lime / gypsum precipitation
- Ettringite process
- Nanofiltration
- Controlled crystallization
Select exact antiscalant chemistry from your water analysis
Calculate safe recovery limits
Recommend Indian-available products
Prepare a technical justification for tenders
Sodium Sulfate (Na₂SO₄) is mainly used as a filler / processing aid in:
- Detergent powders
- Laundry bars
- Bulk detergent blends
Key Functions
- Improves flowability of detergent powder
- Controls bulk density
- Acts as an anti-caking agent
- Ensures uniform mixing of actives
- Reduces overall formulation cost
Typical Specifications
- Na₂SO₄: ≥ 99.0%
- Moisture: ≤ 0.3–0.5%
- Chloride (NaCl): ≤ 0.5% (important for stability)
- Insoluble matter: ≤ 0.1–0.2%
- Detergent powders: 10–40%
- Economy detergent grades: up to 50%
- Laundry bars: 15–30%
25 kg / 50 kg HDPE laminated bags
1 MT jumbo bags for large plants
Bulk handling for continuous detergent lines
Large Manufacturers
- Nirma Limited – Gujarat
- Gujarat Alkalies & Chemicals Ltd (GACL)
- Tata Chemicals Ltd
- Aditya Birla Chemicals
Meghmani Organics
Local Gujarat sulfate producers
ZLD-recovered sodium sulfate (after quality check)
China:
- Detergent grade, granular & powder
- CIF India: USD 90–150 / MT
Indicative Pricing (India – Bulk)
- ₹6 – ₹12 per kg (domestic)
- Imported landed cost often competitive for large volumes
Regulatory & Compliance
- HSN: 283311 / 283319
- GST: As applicable
- MSDS required for large buyers
Sodium Sulfate – Industrial Grade (Na₂SO₄)
HSN Code: 283311 / 283319
Forms: Anhydrous powder, granular, Glauber’s salt
Typical Purity: 98–99% min
Nirma Limited – Gujarat
- Industrial & detergent grade
- Bulk, jumbo bag & bag supply
Gujarat Alkalies & Chemicals Ltd (GACL) – Gujarat
- Consistent quality, glass & chemical use
Aditya Birla Chemicals – Gujarat
- High-purity industrial grade
Tata Chemicals Ltd
- Reliable supply for large industries
Meghmani Organics Ltd – Gujarat
- Export-capable industrial grade
- Saurashtra Chemicals
- Vishnu Chemicals
- Local sulfate recovery units (ZLD by-product Na₂SO₄)
- Authorized traders in Ankleshwar, Vapi, Vadodara
China (Largest & Cost-Competitive)
- Sichuan Hongya Qingyi Chemical
- Hunan Yuanxing Chemical
- Guangxi Liuzhou Chemical
- Henan Jinshan Chemical
Packaging & Logistics
- 25 kg / 50 kg HDPE bags
- 1 MT jumbo bags
- Bulk supply for detergent plants
Indicative Pricing (India – Bulk)
- Domestic: ₹6 – ₹14 per kg
- Imported (landed): ₹8 – ₹12 per kg
- Detergent manufacturers
- Glass & fiberglass plants
- Textile & dyeing units
- Chemical manufacturers
- ETP / ZLD operators
Sodium Sulfate (Na₂SO₄) in Wastewater Treatment – Reality Check
Unlike alum, ferric salts, or lime, sodium sulfate is not a primary treatment chemical. Its role is supporting or indirect, depending on the process.
In some biological systems, sulfate presence supports sulfate-reducing bacteria (SRB) under anaerobic conditions.
Used mainly in research or specialized industrial effluents.
- Used in lab studies to:
- Simulate sulfate load
- Test membrane rejection
- Evaluate scaling tendency
- In certain ion exchange or electrochemical processes, sodium sulfate acts as a neutral electrolyte.
- Used in electrodialysis (ED/EDR) trials.
Recovered sodium sulfate from RO–MEE–crystallizer systems is:
- Stored
- Reused in low-grade applications
- Sold to detergent / textile buyers (after QC)
Adds sulfate, increasing:
- CaSO₄ scaling
- RO fouling risk
- Evaporator scaling
Makes ZLD more expensive
Increases sludge handling problems
- Sodium sulfate is often:
- Generated, not added
- Present in mixed salt cake
- Recovered as a saleable by-product
Quality check required:
- Moisture
- Chloride
- Heavy metals
- Textile dyeing
- Detergent manufacturing
- Pulp & paper
- Chemical manufacturing
- Power plant ZLD systems
Some ETPs buy low-cost sodium sulfate only for:
- Pilot trials
- Electrochemical systems
- Neutral electrolyte applications
If so, industrial grade (98%) is sufficient.
. Calcium Sulfate (CaSO₄) Scale
Most manageable sulfate scale
Methods
- Weak acid cleaning (citric, sulfamic)
- Chelating agents (EDTA, NTA)
- Acid + dispersant blends
- Hot water circulation (60–70 °C)
Typical CIP Conditions
- pH: 3–4
- Time: 6–12 hours
Extremely difficult scales
Specialty Methods Only
- Strong chelant-based dissolvers
- Alkaline chelation systems
- Redox-assisted dissolvers
- Multi-step chemical treatments
Used when chemical cleaning is ineffective.
- High-pressure water jetting
- Pigging (pipes)
- Tube brushing
- Manual descaling
Thermal shock (limited success)
Controlled dissolution by temperature cycling
Offline soaking
Calcium sulfate
- Low-pH chelant cleaning
- Circulation at low pressure
- Temperature ≤ membrane limit
Barium sulfate
- Often irreversible
- Membrane replacement common
PPE mandatory
Chelants can mobilize heavy metals
Neutralize spent CIP before disposal
Follow MSDS strictly
Sodium Sulfate (Na₂SO₄) is used mainly as a filler and processing aid in:
- Laundry detergent powders
- Economy detergent blends
- Laundry bars (cakes)
Functional Benefits
- Improves free flow of detergent powder
- Controls bulk density and packing
- Prevents caking and lump formation
- Ensures uniform distribution of surfactants
- Reduces formulation cost
Detergent / Industrial Grade (Anhydrous)
Typical Quality Specifications
- Na₂SO₄ content: ≥ 99.0%
- Moisture: ≤ 0.3–0.5%
- Chloride (as NaCl): ≤ 0.5%
- Insoluble matter: ≤ 0.1–0.2%
- Appearance: White, free-flowing powder or granules
Typical Dosage Levels
- Premium detergent powders: 10–20%
- Economy detergent powders: 25–50%
- Laundry bars: 15–30%
- 25 kg / 50 kg HDPE laminated bags
- 1 MT jumbo bags for large plants
- Store in dry, covered warehouse
Large Manufacturers
- Nirma Limited – Gujarat
- Gujarat Alkalies & Chemicals Ltd (GACL)
- Tata Chemicals Ltd
- Aditya Birla Chemicals
Cost-Effective / Regional Sources
- Meghmani Organics
- Local Gujarat sulfate producers
- ZLD-recovered sodium sulfate (after QC)
Imported Supply (Large-Volume Buyers)
China:
- Detergent-grade granular & powder
- CIF India: USD 90–150 / MT
Indicative Pricing (India – Bulk)
- Domestic supply: ₹6 – ₹12 per kg
- Imported (landed): ₹8 – ₹12 per kg
Regulatory & Compliance (India)
- HSN Code: 283311 / 283319
- GST: As applicable
- Non-hazardous under normal use
- sodium sulphate
- sodium sulfate
- Na2SO4
- CAS 7757-82-6 (anhydrous)
- CAS 7727-73-3 (decahydrate)
- E514
- EC 231-820-9
- sodium sulphate SDS
- sodium sulphate MSDS
- sodium sulphate supplier
- sodium sulphate manufacturer
- sodium sulphate exporter
- bulk sodium sulphate
- industrial sodium sulphate
- sodium sulphate price
