How should the wastewater from the square aluminum tube oxidation workshop be treated? What impact will impurities have on the performance of square aluminum tubes during processing?

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2022-08-18

It is one of the essential energy sources for industrial production. Surface treatment workshops are often the users with the largest water consumption. How to save water consumption in surface treatment production has always been a matter of concern. Most surface treatment workshops have done water reuse and recycling to varying degrees. Some factories can reuse 60% of the water, and some of the water is discharged into nearby rivers. The treated water can be used for fish farming. After the new water treatment technology is adopted, the new water required is greatly reduced.

Wastewater treatment method of square aluminum pipe oxidation workshop:
Water is one of the essential energy sources for industrial production, and the surface treatment workshop is often the largest user of water consumption. How to save water consumption in surface treatment production has always been a matter of concern. Most surface treatment workshops have done water reuse and recycling to varying degrees. Some factories can reuse 60% of the water, and some of the water is discharged into nearby rivers. The treated water can be used for fish farming. After the new water treatment technology is adopted, the new water required is greatly reduced.
The wastewater containing alkali, acid and trace aluminum ions discharged from the water washing tank is mixed in the workshop and discharged to the neutralization tank of the comprehensive treatment station. The pH value is measured first. If it meets the requirements, it flows into the multistage sedimentation tank. If it does not meet the requirements, it is adjusted with acid and alkali. In case of partial acid, sodium hydroxide is used for neutralization treatment, and aluminum ions form aluminum hydroxide precipitation in a pH neutral environment. The neutralized suspended waste liquid is coagulated, settled and separated with polymer coagulant. If the clarified water in the upper part meets the environmental protection discharge requirements, it can be directly discharged or used.
How much is the influence of impurities during aluminum tube processing:
1. Al Si alloy has excellent forging function and corrosion resistance. When the eutectic temperature is 577, the solubility of silicon in solid solution is 1.65%. Although the solubility decreases with the decrease of temperature, such alloys are generally not strengthened by heat treatment.
2. Magnesium alloy can not be strengthened by heat treatment, but it has excellent weldability, corrosion resistance, and moderate strength. The equilibrium phase diagram of Al Mg alloy system is rich in aluminum. Although the solubility curve indicates that the solubility of magnesium in aluminum decreases greatly with the decrease of temperature.
3. Al Mn alloy is a staggered age hardening alloy, which can not be strengthened by heat treatment. Some equilibrium phase diagrams show that at eutectic temperature 658, the greater solubility of manganese in solid solution is 1.82%.

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