![\"company\"](\"https:\/\/www.hncmcl.com\/uploads\/company1.jpg\")
<\/li>\n<\/ol>\n
Proper Dissolution Method<\/p>\n
Follow the “slow addition, stirring, cooling” principle.<\/p>\n
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- Dissolution Container: Use plastic or ceramic containers only. Never use metal containers, as the alkaline solution will corrode them.<\/li>\n
- Water Quantity: Use a ratio of approximately 1 part caustic soda to 10–20 parts water.<\/li>\n
- Procedure: Add caustic soda slowly and steadily to the water while stirring continuously. Never add water to caustic soda, as this may cause violent reactions and splashing.<\/li>\n
- Handling Heat: Significant heat is released during dissolution. Allow the solution to cool to room temperature before use.<\/li>\n<\/ul>\n
Key Techniques – Dosage and Addition Method<\/p>\n
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- Dosage Estimation: As a rough reference, 5–8 g of caustic soda per cubic meter of wastewater raises the pH by approximately 1 unit. However, always perform a jar test: take a small sample of wastewater, add varying doses of caustic soda solution, and measure the resulting pH to determine the optimal dosage for achieving a target pH of 7–8.<\/li>\n
- Heavy Metals Present: If wastewater contains heavy metals (e.g., copper, iron, lead), a higher dosage may be required to form insoluble hydroxides. Adjust the jar test accordingly and measure residual metal concentrations.<\/li>\n
- Addition Method: Add the prepared caustic soda solution slowly and evenly to the treatment tank while mixing. After addition, continue mixing for 10–15 minutes, then allow settling.<\/li>\n<\/ul>\n
Cost-Saving Tips & Precautions<\/p>\n
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- Use 96% purity caustic soda for most applications; higher purity is rarely necessary.<\/li>\n
- Combine with coagulants (e.g., polyaluminum chloride, polyacrylamide) to enhance flocculation and reduce caustic soda consumption.<\/li>\n
- Do not add caustic soda simultaneously with acidic agents (e.g., hydrochloric acid, sulfuric acid). If both are required, allow 1–2 hours between additions.<\/li>\n
- Monitor pH continuously during dosing and adjust as needed.<\/li>\n
- Treat residual caustic soda solution by neutralization before disposal according to environmental regulations.<\/li>\n<\/ul>\n
Media Contact<\/span>
Company Name:<\/strong> Hunan Sincere Chemicals Co., Ltd.<\/a>
Email:<\/strong> Send Email<\/a>
Country:<\/strong> China
Website:<\/strong> https:\/\/www.hncmcl.com\/<\/a><\/p>\n<\/p>\n","protected":false},"excerpt":{"rendered":"
For chemical industry professionals and wastewater treatment operators, caustic soda is highly effective and economical. It enables rapid pH adjustment, heavy metal precipitation, and enhanced coagulation-flocculation. However, common issues include improper dosing (either insufficient or excessive) and incorrect dissolution methods … Continue reading