Alkaline three-in-one pretreatment of aluminum, lye regeneration and aluminum hydroxide online recovery process

An aluminum hydroxide, three-in-one technology, applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of complex process, low efficiency, long time consumption, etc., to improve the concentration of free alkali, improve efficiency, cost reduction effect

Active Publication Date: 2018-10-19
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 chemical agents, 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
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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alkaline three-in-one pretreatment of aluminum, lye regeneration and aluminum hydroxide online recovery process
  • Alkaline three-in-one pretreatment of aluminum, lye regeneration and aluminum hydroxide online recovery process
  • Alkaline three-in-one pretreatment of aluminum, lye regeneration and aluminum hydroxide online recovery process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Embodiment 1 (sand surface material)

[0122] Aluminum directly enters the alkaline three-in-one grinding tank 1, R(NaOH / Al 3+ )3.75, NaCl30g / L, react for 10-15 minutes, 50-60°C, trickle for 1 minute; wash in the first non-flowing water washing tank 2 for 1.5 minutes, trickle for 1 minute, and wash in the second non-flowing water washing tank 3 for 1 minute , trickle for 1 minute; enter two flowing water washing tanks, wash for 1 minute and 1 trickle for 1 minute, and complete the pre-oxidation treatment.

Embodiment 2

[0123] Embodiment 2 (sand blasting material)

[0124] Aluminum directly enters the alkaline three-in-one grinding tank 1, R(NaOH / Al 3+ )3.75, NaCl30g / L, react for 5-10 minutes, 50-60°C, trickle for 1 minute; wash in the first non-flowing water washing tank 2 for 1.5 minutes, trickle for 1 minute, and wash in the second non-flowing water washing tank 3 for 1 minute , trickle for 1 minute; enter two flowing water washing tanks, wash for 1 minute and 1 trickle for 1 minute, and complete the pre-oxidation treatment.

[0125] Shown by embodiment 1-2, alkaline etching solution of the present invention can produce chemical frosting material and mechanical sandblasting material.

Embodiment 3

[0126] Embodiment 3 (sanding ability of NaCl)

[0127] According to Table 1, the aluminum material directly enters the alkaline three-in-one grinding tank 1, R(NaOH / Al 3+ )3.75, NaCl 0g / L, react for 5-10 minutes, 50-60°C, trickle for 1 minute; wash in the first non-flowing water washing tank 2 for 1.5 minutes, trickle for 1 minute, and wash in the second non-flowing water washing tank 3 for 1 minutes, trickle for 1 minute; enter two flowing water washing tanks, wash for 1 minute and trickle for 1 minute respectively, and complete the pre-oxidation treatment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an aluminum pretreatment alkaline three-in-one, alkaline liquor regeneration and aluminum hydroxide online recycling process. A medicament recycling system and two flowing washing tanks are included. The medicament recycling system comprises an alkaline three-in-one grinding tank and a non-flowing washing tank sub system; the a non-flowing washing tank sub system is arranged to be in reverse series-connection with the alkaline three-in-one grinding tank through a first valve; the non-flowing washing tank sub system comprises a first non-flowing washing tank body and a second non-flowing washing tank body which are arranged to be in reverse series-connection with each other, and the start end of the second non-flowing washing tank body is furthermore provided with a water supplementing opening and a third valve in the water flowing direction; and the two flowing washing tanks are arranged to be in reverse series-connection, the start end is provided with a water inlet in the water flowing direction, and a water outlet in the final end is connected with the water supplementing opening of the second non-flowing washing tank body. The aluminum pretreatment alkaline three-in-one, alkaline liquor regeneration and aluminum hydroxide online recycling process proposed by the invention has the advantages that zero discharging of waste water is achieved, waste slag is reduced, chemical consumption is low, water is saved, blocking caused by scaling is avoided, and online recycling of alkaline liquor and aluminum hydroxide is achieved.

Description

technical field [0001] The invention relates to the technical field of anodic oxidation surface pretreatment of aluminum alloys, in particular to the three-in-one alkaline three-in-one aluminum pretreatment, lye regeneration and aluminum hydroxide online recovery process. 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 pretreatm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16
CPCC25D11/16
Inventor 熊晨凯熊映明
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products