Aluminum alloy anodizing line treatment process

Abstract

The invention relates to an aluminum alloy anodizing line treatment process. The aluminum alloy anodizing line treatment process comprises a functional trough system and water washing trough systems arranged between functional troughs. The functional trough system is arranged along the flow direction of washing water in a manner that an upstream functional trough is compatible with a downstream functional trough, and the water washing trough systems are arranged in an overall phase-reversing in-series-connection manner. According to the aluminum alloy anodizing line treatment process, a mode in which a flowing water washing tank is separately configured for each functional trough in the traditional anodizing line is changed. Since all water washing troughs are connected in series in a phase-reversing manner, the number of the water inlets and outlets is greatly reduced and the water consumption is decreased from 25.0-35.0 tons per ton material to 5.0-6.0 tons per ton material and the water is saved by more than 80%. The treatment process disclosed by the invention has the advantages of low production cost, high efficiency and environmental friendliness and is suitable for industrial application.

Description

technical field [0001] The invention aims at the field of chemical industry, and in particular relates to a treatment process of an aluminum alloy anodic oxidation line and its process configuration. Background technique [0002] The current aluminum alloy anodizing line has been used by most aluminum factories for more than 100 years. There are 19 slots in the whole line, including 6 functional slots, each of which is equipped with two independent flowing washing tanks, and is also equipped with a flowing washing waiting tank, totaling 13 flowing washing tanks. The entire oxidation line is equipped with 6 water inlets and 6 outlets according to the traditional process configuration. Each water inlet (drain outlet) consumes nearly 5 tons of water per ton of material, and the total water consumption is nearly 30 tons per ton of material. This configuration has high water consumption and high environmental pollution, and its slot layout is as follows figure 1 As shown, the f...

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Problems solved by technology

[0004] (1) For aluminum materials that have been stored for a long time, the oil removal is not good, the natural oxide film cannot be removed cleanly, the alkali corrosion is uneven, the surface of the aluminum material has different gloss, and the oxidation coloring is uneven;

[0006] (3) In order to strengthen the degreasing ability, some manufacturers add about 5-10g / L ammonium bifluoride in the degreasing tank to completely eliminate the hidden danger of degreasing, but increase the pressure of treating wastewater containing fluorine and ammonia nitrogen

Otherwise, the complexation and ionization dynamic balance will not be well coordinated during the coloring process, and the Sn 2+ Poor deposition conditions in the pores will affect the coloring efficiency and coloring tone

[0034] 6. Sealing groove

[0037] 1. The process design concept is unreasonable. The oil removal tank and the neutralization tank are strongly acidic baths, and the alkali etching tank is a strong alkaline bath. Aluminum materials need to be treated from strong acid to strong alkali, and then from strong alkali to strong acid. There are two washing tanks in the middle. Although a lot of running water is used for cleaning, it is inevitable that the tanks will be mixed, and the chemicals in the working tanks are easily consumed by each other.

[0038] 2. There are too many washing tanks, and the washing tanks for each functional tank are independent. There are six water inlets and six drains in the whole oxidation line, and the water consumption is too large

In addition to water costs, additional costs are required for the treatment and discharge of these wastewater

[0039] 3. Fluorine is contained in the bath solution of degreasing tank and medium temperature sealing tank, which hinders the treatment and reuse of waste water

However, the utilization efficiency of water resources in industrial production is too low, and the water consumption per unit of GDP is five times that of developed countries, which restricts the development of aluminum processing enterprises, especially the polluted water containing toxic substances such as nickel and fluorine.

Traditional oxidation line slot configuration, water saving and cross-consumption of chemicals are the unity of opposites

If the amount of water is too little, the bath solution of the functional tank may be mixed with each other, and the medicines will consume each other

according to figure 1 In the traditional water washing method shown, water saving may cause stringing of tanks, increase chemical consumption, affect product quality, and even cause production stoppage, and high water consumption is determined by the configuration of the entire oxidation line system

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