Fluorine-free COD-free three-in-one zero-diopter pretreatment process for aluminum alloy

Abstract

The invention relates to a fluorine-free COD-free three-in-one zero-diopter pretreatment process for an aluminum alloy, namely a fluorine-free COD-free three-in-one zero-diopter treatment and medicament compatibility and series-opposing water saving system for the aluminum alloy. The system comprises a medicament recovery system and a series-opposing water saving system; the medicament recovery system comprises a three-in-one zero-diopter groove and a non-flowing water washing groove subsystem, and the overall non-flowing water washing groove subsystem is arranged in a series-opposing manner; in addition, a first water inlet is formed in the initial end of the water flowing direction of the non-flowing water washing groove subsystem, and a water outlet in the terminal end of the non-flowing water washing groove subsystem is connected to a water supplementation opening of the three-in-one zero-diopter groove through a water supplementation one-way valve; and the series-opposing water saving system comprises a function groove subsystem and a flowing water washing groove subsystem arranged between function grooves. By means of the fluorine-free COD-free three-in-one zero-diopter pretreatment process for the aluminum alloy, the quality of the surface of the aluminum alloy is greatly improved; the process is an updating technology for an existing common alkaline degreasing process; the problems of fluorine pollution and COD standard exceeding of anodic oxidation pretreatment of the aluminum alloy can be effectively solved; and high-degree water saving of an anodic oxidation line is achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum material surface treatment, in particular to a fluorine-free and COD-free three-in-one flat-glazing pretreatment process for aluminum alloys. Background technique [0002] Alkaline etching process has been used for more than 100 years in the pre-treatment process of aluminum alloy flat. Alkali etching has the disadvantages of high aluminum consumption, high alkali consumption, more alkali slag, difficult process control, many defects, high production cost, COD content, and large environmental pollution, which has long been recognized by the industry. Standard alkali etching slot arrangement figure 2 As shown, 1# oil removal tank, 4# alkali corrosion tank, 7# neutralization tank, 11# oxidation tank and 14# sealing tank are working tanks, and each working tank is equipped with two washing tanks, plus flowing water washing waiting tank , 10 slots are required for pre-oxidation treatment, of which ...

AI Technical Summary

Problems solved by technology

[0020] 2. The process is complicated and there are many slots

There are a total of 10 slots in front of the oxidation tank, 3 working tanks, and 7 washing tanks, which are too complicated;

[0021] 3. Low efficacy

It takes a long time, which seriously restricts the production capacity of the oxidation line;

[0022] 4. There are many working slots, and the consumption of chemicals is large

For 1#, 4#, 7#, 11#, 14# working tanks, the total chemical consumption is 100-120 kg / ton of material. In order to treat the wastewater containing these chemical agents, the aluminum material factory will spend more cost;

[0023] 5. The washing tanks are independent of each other, and the water consumption is large

11 washing tanks, two independent, divided into 5 groups, 5 water inlets, 5 outlets, the total water consumption is more than 20.0 tons per ton of material, in addition to the cost of water, the treatment and discharge of these waters require additional pay the cost;

[0024] 6. The 1# tank contains fluorine, which hinders the reuse of wastewater;

[0025] 7. Tanks 1# and 7# contain ammonia nitrogen, and tank 4# contains COD, which makes the difficulty of wastewater treatment worse.

With such a configuration, excessive water saving will inevitably cause the functional tanks to intersect with each other

[0028] The present invention is aimed at the disadvantages of complex traditional alkali etching process, too many working tanks and washing tanks, low work efficiency, large dosage of chemicals, large waste water discharge, high cost of treating fluorine and ammonia nitrogen, too low efficiency, and high waste rate. A specially designed set of brand-new aluminum alloy flat light treatment process

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