Materials resistant to high-temperature caustic soda
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Our company has waste alkaline liquid containing COD, and we want to calcine it to remove the COD before reusing it; however, we are unable to find materials that can withstand high temperatures and corrosion. Experts, please offer some advice
It can withstand high temperatures; any temperature below 200°C makes polytetrafluoroethylene-lined steel pipes a viable option. If the temperature is even higher, MONEL alloy can be considered
I don’t know much about calcined materials. I have been working in the field of environmental protection for ten years. Methods like multi-effect evaporation plus calcination generally involve high investment and operating costs, and during calcination, some of the material may turn into sodium carbonate. Therefore, it is recommended to remove COD in an aqueous solution as much as possible first, and then conduct a pilot test to evaluate the effectiveness of this approach.