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Wastewater and waste residue zero-emission configuration of aluminum alloy powder spraying pretreatment chromizing line

An aluminum alloy and pretreatment technology, which is applied in the field of aluminum alloy processing, can solve problems such as environmental protection and fluorine pollution, and achieve the effects of slowing down corrosion, increasing stability, and achieving zero emissions

Inactive Publication Date: 2019-03-29
熊映明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More critically, fluorotitanic acid and fluorozirconic acid chromium-free agents contain fluorine, and the use of highly toxic chromium-free chemicals will still cause fluorine pollution.
"The front door drives away the wolves, and the back door enters the tiger." It is not the best choice to replace polluting processes with equally unenvironmental-friendly processes

Method used

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  • Wastewater and waste residue zero-emission configuration of aluminum alloy powder spraying pretreatment chromizing line
  • Wastewater and waste residue zero-emission configuration of aluminum alloy powder spraying pretreatment chromizing line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] 1# degreasing tank, non-flowing water washing tank, 6# chromizing tank, 7# draining tank, pump 1 and water inlet; the non-flowing water washing tank is reversely connected to the 1# degreasing tank; the 7 The #draining tank, the pump 1 and the 6# chromizing tank are reversely connected in series; the non-flowing water washing group tank is connected to the water inlet.

[0155] 2# non-flowing water washing tank, 3# non-flowing water washing tank, 4# non-flowing water washing tank and 5# non-flowing water washing tank are washed with tap water for 60 seconds and dripped for 30 seconds for production.

[0156] 1# degreasing tank control indicators are:

[0157] HF (50wt.%) 18g / L, PBTCA (50wt.%) 6g / L;

[0158] Time: 4 minutes;

[0159] Temperature: room temperature;

[0160] The control index of 6# chromizing tank is:

[0161] Hydrofluoric acid (50wt.%) 0.75g / L, chromic anhydride 3.0g / L, PBTCA 3.0g / L;

[0162] Chromizing time 150 seconds;

[0163] Temperature: room t...

Embodiment 2

[0167] 2# non-flowing water washing tank, 3# non-flowing water washing tank, 4# non-flowing water washing tank and 5# non-flowing water washing tank are washed with tap water for 60 seconds and dripped for 30 seconds for production.

[0168] 1# degreasing tank control indicators are:

[0169] HF (50wt.%) 18g / L, PBTCA (50wt.%) 6g / L;

[0170] time 4 minutes;

[0171] The temperature is normal temperature;

[0172] The control index of 6# chromizing tank is:

[0173] Hydrofluoric acid (50wt.%) 0.75g / L, chromic anhydride 3.0g / L, PBTCA 3.0g / L;

[0174] Chromizing time 150 seconds;

[0175] The temperature is normal temperature;

[0176] pH: 2.0;

[0177] Production is carried out according to the above control indicators, and the sprayed materials can meet the national standard testing requirements. Increase the chromizing time of 6# chromizing tank to 240 seconds, and the national standard test is qualified; reduce the chromating time of 6# chromizing tank to 50 seconds, an...

Embodiment 3

[0179] 2# non-flowing water washing tank, 3# non-flowing water washing tank, 4# non-flowing water washing tank and 5# non-flowing water washing tank are washed with tap water for 60 seconds and dripped for 30 seconds for production.

[0180] 1# degreasing tank control indicators are:

[0181] HF (50wt.%) 18g / L, PBTCA (50wt.%) 6g / L;

[0182] Time: 4 minutes;

[0183] The temperature is normal temperature;

[0184] The control index of 6# chromizing tank is:

[0185] Hydrofluoric acid (50wt.%) 0.75g / L, chromic anhydride 3.0g / L, PBTCA 3.0g / L;

[0186] Chromizing time: 150 seconds;

[0187] The temperature is normal temperature;

[0188] pH: 2.0;

[0189] Production is carried out according to the above control indicators, and the sprayed materials can meet the national standard testing requirements. Increase the temperature of 6# chromizing tank to 35°C, and the national standard test is qualified; reduce the temperature of 6# chromizing tank to 5°C, and occasionally fail ...

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Abstract

The invention discloses a wastewater and waste residue zero-emission configuration of an aluminum alloy powder spraying pretreatment chromizing line. A degreasing tank I contains hydrofluoric acid and2-phosphonobutane-1,2,4-tricarboxylic acid; a chromizing tank VI contains hydrofluoric acid, 2-phosphonobutane-1,2,4-tricarboxylic acid and chromic anhydride. On the basis that the degreasing tank Iis compatible with an agent in the chromizing tank VI, a tank II, a tank III, a tank IV and a tank V are designed to be non-moving water washing tanks and are reversely connected in series for supplementing water, tap water enters from the tank V and flows reversely according to a route of the tank V to the tank IV to the tank III to the tank II to the tank I, a degreasing agent can be recycled, and a degreasing agent and cleaning water can be saved; a chromizing solution collected by a draining tank VII is pumped into the chromizing tank VI through a pump I, the chromizing solution can be recycled, zero emission of wastewater and waste residue can be realized, and production and environmental protection cost can be reduced to a large extent.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a configuration for zero discharge of waste water and slag from a chromization line for pretreatment of aluminum alloy powder spraying. Background technique [0002] Chromium-containing wastewater is generated after spraying chromization pretreatment. Chromium belongs to the first class of pollutants, and the wastewater must be collected and treated separately, and the wastewater can only be discharged when it meets the standard. Wastewater containing hexavalent chromium is generally treated by redox method, that is, using ferrous sulfate, sodium pyrosulfite and other reducing agents to reduce Cr in wastewater to 6+ reduced to Cr 3+ , then adjust the pH of the wastewater to 7-8, add alkali and flocculant to make Cr 3+ Form Cr(OH) 3 Precipitation, chromium hydroxide (trivalent chromium) chromium slag is formed through flocculation, sedimentation, and pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/40C02F1/62C02F2103/16C02F2303/08
Inventor 熊映明
Owner 熊映明