Alkaline three-in-one aluminum pretreatment with pot liquid and aluminum hydroxide online recovery system

Abstract

The invention discloses an aluminum pretreatment alkaline three-in-one online recycling system for demolding alkaline liquor for extruding mold aluminum material heads and aluminum hydroxide. The recycling system for the demolding alkaline liquor for extruding the mold aluminum material heads and the aluminum hydroxide is arranged in an alkaline three-in-one dull-polish groove and comprises a collecting tank for the demolding alkaline liquor for extruding the mold aluminum material heads, a sedimentation pond, a centrifugal machine collecting pond, a first pump, a second pump and a pipeline; a slag drawing circulation sub-system, a blockage self-saving sub-system, an aluminum hydroxide and alkaline liquor recycling sub-system and a circulation sub-system of the demolding alkaline liquor for extruding the mold aluminum material heads are mainly formed; and therefore, the demolding alkaline liquor for extruding the mold aluminum material heads and alkaline etching liquid can be subjected to alkaline liquor and aluminum hydroxide online recycling, and huge waste of aluminum resources is reduced. By means of the aluminum alloy surface pretreatment alkaline three-in-one online recycling total system for the demolding alkaline liquor for extruding the mold aluminum material heads and the aluminum hydroxide, the problem that the pipeline, valves and the pumps are blocked by aluminum scale can be thoroughly eradicated, and the beneficial effects of waste water zero discharging, industrial waste slag reducing, low chemical consumption, water saving and scale blockage avoidance are achieved.

Description

technical field [0001] The invention relates to the technical field of anodic oxidation surface pretreatment of aluminum alloys, in particular to an alkaline three-in-one aluminum pretreatment system with pot liquid and aluminum hydroxide online recovery system. Background technique [0002] The traditional aluminum alloy alkali etching process has been used for more than 100 years. Alkali etching has the disadvantages of high aluminum consumption, high alkali consumption, more alkali slag, difficult process control, many defects, high production cost, and large environmental pollution, which has long been recognized by the industry. Existing standard alkali etching and oxidation line slot layout image 3 As shown, among them, 4#, 7#, 10#, 13# and 16# tanks are working tanks, each working tank is equipped with two flowing water washing tanks, 9 slots are required for pre-oxidation treatment, and 4# alkali etching tank is The main working tank for surface pretreatment. The ...

AI Technical Summary

Problems solved by technology

There are the following deficiencies: 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 completely, the alkali corrosion is uneven, the surface of the aluminum material appears different luster, and the oxidation coloring is uneven; 2. The oil removal tank contains 150- 200g / L sulfuric acid is easy to bring into the alkali corrosion tank to neutralize caustic soda; in order to strengthen the degreasing ability, some manufacturers add about 5-15g / L ammonium bifluoride in the degreasing tank to completely eliminate the hidden danger of degreasing, but increase the treatment Fluorine and ammonia nitrogen wastewater pressure

[0041] 2. The process is complicated and there are many slots

There are a total of 9 slots in front of the oxidation tank, 3 working tanks, and 6 washing tanks, which are too complicated;

[0042] 3. Low efficacy

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

[0043] 4. There are many working slots, and the consumption of chemicals is large

1#, 4#, and 7# are working tanks, and the total chemical consumption is 60-80 kg / ton of material. In order to treat the wastewater containing these chemicals, the aluminum material factory will spend more cost;

[0044] 5. There are many washing tanks and large water consumption

In addition to water costs, the treatment and discharge of these waste waters require additional environmental protection costs;

[0045] 6. The 1# tank contains fluorine, which hinders the reuse of wastewater;

[0046] 7. Tanks 1# and 7# contain ammonia nitrogen, making wastewater treatment even worse

[0051] Adding complexing agent to the alkaline etching tank, the aluminum ions are separated and separated, and the dissolution and carry-out of aluminum can achieve a dynamic balance. In addition to meeting the requirements for the appearance quality of aluminum materials, the bath management is very simple, but a fatal defect is ignored, that is, high Alkaline etching solution with high aluminum ion concentration and high viscosity is brought into 5# and 6# mobile washing tanks, and enters the waste water center to form industrial waste residue, which not only wastes aluminum resources, but also brings huge environmental protection treatment pressure

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