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Environment protection method of handling industrial abandoned phosphorized liquid

An environmental protection treatment and phosphating solution technology, applied in chemical instruments and methods, inorganic pigment treatment, water/sewage multi-stage treatment, etc., can solve problems such as red tide, environmental pollution, waste of resources, etc.

Active Publication Date: 2007-10-31
DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two treatment methods cause waste of resources on the one hand, and cause serious pollution to the environment on the other hand, making the water quality eutrophic and producing the phenomenon of "red tide"

Method used

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  • Environment protection method of handling industrial abandoned phosphorized liquid
  • Environment protection method of handling industrial abandoned phosphorized liquid
  • Environment protection method of handling industrial abandoned phosphorized liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Regeneration of waste phosphating solution

[0076] To regenerate 3 tons of scrapped "medium temperature zinc-manganese phosphating solution" with known main components, the operation process is as follows:

[0077] 1. Determination of free acidity and total acidity

[0078] By acid-base titration. Take 10ml of the sample and titrate it with 0.1mol / L sodium hydroxide standard solution, and the number of milliliters consumed is represented by points.

[0079] (1) Reagent

[0080] Sodium hydroxide: 0.1mol / L standard solution.

[0081] Methyl orange (or bromophenol blue): indicator.

[0082] Phenolphthalein: indicator.

[0083] (2) Inspection method

[0084] Free acidity: Use a pipette to draw 10ml of phosphating solution into a 250ml Erlenmeyer flask, add 50ml of distilled water, and add 2-3 drops of methyl orange (or bromophenol blue) indicator. Titrate with sodium hydroxide standard solution until the solution turns orange (or titrate with bromophenol blue indica...

Embodiment 2

[0226] Waste phosphating solution is converted into anti-rust primer pigment:

[0227] The waste phosphating solution with unknown formula is treated by making anti-rust primer pigments, and transformed into new products, which are applied in industrial production.

[0228] The specific conversion process is as follows:

[0229] Waste phosphating solution+alkaline substances (calcium oxide, calcium hydroxide or sodium hydroxide, etc.)→full stirring→precipitation and filtration→washing the sediment to PH6-7→drying at 102°C→light yellow to white phosphate→crushing and grinding to 20-50μm → anti-rust primer or intermediate layer paint pigment.

[0230]Take one ton of waste phosphating solution (acidic), add appropriate amount of alkaline substances, adjust the pH value to 8-10, fully stir, let stand, separate and filter, the filtrate can be used as reclaimed water in industrial production, and the filter residue can be used as anti-corrosion Rust pigment, washed with water to P...

Embodiment 3

[0240] Regeneration of waste phosphating solution

[0241] To regenerate 1 ton of scrapped "low temperature zinc-based phosphating solution" with known main components, the inspection process of each main component is as follows:

[0242] 1. Determination of free acidity and total acidity

[0243] By acid-base titration. Take 10ml of the sample and titrate it with 0.1mol / L sodium hydroxide standard solution, and the number of milliliters consumed is represented by points.

[0244] (1) reagent and equipment are identical with embodiment 1

[0245] (2) Inspection method

[0246] Free acidity: Use a pipette to draw 10ml of phosphating solution into a 250ml Erlenmeyer flask, add 50ml of distilled water, and add 2-3 drops of methyl orange (or bromophenol blue) indicator. Titrate with sodium hydroxide standard solution until the solution turns orange (or titrate with bromophenol blue indicator until it changes from yellow to blue-purple), which is the end point. Write down the ...

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Abstract

The invention discloses a environment protection handling method of industrial dumping phosphating liquid, which comprises the following steps: comprising regenerating utilization or inverting utilization; testing the known dispense waste phosphating liquid; checking the free acidity, total acidity and content of each effective composition; comparing the checking result with original phosphating liquid; adjusting the changeable component to the original phosphating liquid; mixing the known or unknown dispense dumping phosphating liquid and basic material proportionally; getting microcosmic salt as rust-preventive pigment of rust-inhibiting primer. This invention possesses flexible method and simple component, which can keep predominance product performance.

Description

technical field [0001] The invention relates to a waste treatment method, in particular to a treatment method for waste phosphating solution. Background technique [0002] Phosphating is a commonly used metal surface treatment technology, which in principle belongs to chemical conversion coating treatment. The early application of phosphating process is rust prevention. After phosphating treatment, a layer of phosphating film is formed on the surface of steel, which plays the role of rust prevention and lubrication. It is widely used for rust prevention in process, transportation, packaging storage and use. Phosphating mainly includes iron-based phosphating, zinc-based phosphating, and manganese-based phosphating. Phosphating treatment before metal coating can improve the adhesion between the paint film and the base metal, and improve the corrosion resistance of the entire coating system. Therefore, phosphating is widely used in the surface pretreatment of metal coating; ma...

Claims

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Application Information

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IPC IPC(8): C01B25/26C02F9/04C09C3/00C09D5/08
Inventor 邓金玲
Owner DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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