Blog Details
Haixing Keyao
Chemical Sales
Blog Details
12
2026
10
Industrial Bleaching Guide: Calcium Hypochlorite for Textile & Paper Pulp Manufacturing
In large-scale manufacturing, achieving consistent whiteness, brightness, and purity in raw materials is critical to final product quality.
In large-scale manufacturing, achieving consistent whiteness, brightness, and purity in raw materials is critical to final product quality. Calcium Hypochlorite remains one of the most widely used industrial oxidative bleaching agents across the global textile, paper pulp, and denim finishing industries.
Compared to liquid sodium hypochlorite (bleach), solid 70% Calcium Hypochlorite offers significant logistics savings, superior shelf life, and higher active chlorine concentration per metric ton.
1. Application in Textile Manufacturing & Denim Processing
In the textile industry, Calcium Hypochlorite is primarily utilized for natural fiber preparation, cotton bleaching, and specialty garment washing:
Cotton & Linen Bleaching: Efficiently breaks down natural pigments, seed fragments, and impurities without degrading fiber tensile strength when properly buffered.
Denim "Distressed" Finishing (Stone Washing): Used by garment laundries to create fashionably faded denim patterns through controlled oxidation.
Equipment De-sizing & De-staining: Cleans dye vats, print rollers, and wastewater treatment circuits.
Technical Insight: Using high-purity 70% Sodium Process Calcium Hypochlorite prevents unwanted calcium salt precipitation on fabric surfaces, which can interfere with subsequent reactive dyeing processes.
2. Application in Paper & Pulp Manufacturing
In small-to-medium pulp mills and recycled paper processing plants, Calcium Hypochlorite plays an indispensable role in pulp brightening and lignin oxidation
Key Advantages in Pulp Processing:
Lignin Degradation: Selectively oxidizes residual lignin fragments that cause yellowing in paper products.
De-inking Recycled Paper: Rapidly breaks down water-based inks and organic binders in recycled paper pulp lines.
Economical Operations: Delivers lower per-ton bleaching costs compared to hydrogen peroxide or sodium chlorite systems in unbleached kraft operations.
3. Storage & Safe Handling in Industrial Facilities
As a UN 2880 Class 5.1 Oxidizer, bulk handling of Calcium Hypochlorite in textile and paper mills must adhere to strict industrial safety protocols:
Storage Facilities: Store in cool, dry, well-ventilated areas away from direct heat, boilers, and combustible organic materials (e.g., starches, dyes, solvents).
Dissolving Equipment: Use corrosion-resistant tanks (FRP, PVC, or stainless steel 316) equipped with mechanical agitators to prepare stock bleaching solutions.
Effluent Treatment: Ensure plant wastewater streams pass through dechlorination units (e.g., using sodium bisulfite or sulfur dioxide) to comply with local environmental discharge limits.
Industrial Bleaching FAQ
Q1: Why choose Calcium Hypochlorite 70% over Sodium Hypochlorite 12% liquid?
Sodium hypochlorite liquid degrades rapidly (losing up to 1–2% active chlorine per week in warm climates) and incurs high freight costs for transporting water. Solid 70% Calcium Hypochlorite reduces shipping volumes by over 80% and offers a 2-year stable shelf life.
Q2: What drum sizes are available for bulk factory orders?
We provide standard 45kg and 50kg HDPE drums with tamper-evident lever-lock rings, as well as customized packaging tailored to automated dry chemical feeder systems.
Optimize Your Industrial Bleaching Cost & Performance
We manufacture and export premium 70% Sodium Process Calcium Hypochlorite tailored for industrial textile and pulp applications worldwide.
👉 [Request Technical Data Sheets (TDS) and Bulk Factory-Direct Quotations Now]
Calcium Hypochlorite 70%,calcium hypochlorite 70% farm sanitation,calcium hypochlorite livestock disinfectant,poultry farm biosecurity chemicals
Add: 1105,Building 2,Meinian Plaza,Hexi District 300220,Tianjin,China
Tel: +86-151 22155302 Email: info@enochlor.com.cn Mobile/WeChat/WhatsApp: +86-151 22155302
Add: 1105,Building 2,Meinian Plaza,Hexi District 300220,Tianjin,China
Tel: +86-151 22155302
Email: info@enochlor.com.cn
Mobile/WeChat/WhatsApp: +86-151 22155302
Feedback