Environmentally-protective slag reducing agent of phosphating solution

A technology of slag reducing agent and phosphating solution, which is applied in the coating process of metal materials, etc., can solve the problems of difficult solid-liquid separation, low production efficiency, long filtration time, etc., achieve high regeneration efficiency, reduce labor intensity, reduce production The effect of slag

Active Publication Date: 2013-03-13
DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of sediment will be generated during the regeneration process of scrapped industrial phosphating solution, which makes it difficult to achieve solid-liquid separation, longer filtration time and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: the embodiment of scrapping zinc-based phosphating solution

[0013] The content of the main sediment components in the scrapped zinc-based phosphating solution is as follows:

[0014] Zn 3 (PO4) 2 : 30~50%

[0015] Fe 3 (PO4) 2 : 20~35%

[0016] Add 1.5kg of slag reducer to 1000L scrapped zinc-based phosphating solution, which contains 20 parts by weight of ethylenediaminetetraacetic acid, 50 parts of hydroxyethylene diphosphonic acid, 15 parts of tartaric acid, and 5 parts of phytic acid. Static filtration, the filtrate is returned to the phosphating processing tank, directly put into production, and the filter residue is recovered to be used as a raw material for the production of regenerative additives.

Embodiment 2

[0017] Embodiment 2: the embodiment of scrapping manganese series phosphating solution

[0018] The content of the main sediment components in the scrap manganese phosphating solution is as follows:

[0019] mn 3 (PO4) 2 : 45~65%

[0020] Fe 3 (PO4) 2 : 20~35%

[0021] Add 2.5-3.0kg of slag reducer to 1000L scrap manganese phosphating solution, which contains 10 parts by weight of ethylenediaminetetraacetic acid, 30 parts of hydroxyethylene diphosphonic acid, 10 parts of tartaric acid, 2 parts of phytic acid After static filtration, the filtrate is returned to the phosphating processing tank, put into production directly, and the filter residue is recovered and used as raw materials for the production of other regenerative additives.

Embodiment 3

[0022] Embodiment 3: the embodiment of scrapping zinc-calcium phosphating solution

[0023] The main technical parameters of scrap zinc-calcium phosphating solution are as follows:

[0024] Zn 3 (PO4) 2 : 20~35%

[0025] Ca 3 (PO4) 2 : 15~25%

[0026] Fe 3 (PO4) 2 : 20~35%

[0027] Add 2.0~2.8kg of slag reducer to 1000L scrap zinc-calcium phosphating solution, which contains 50 parts by weight of ethylenediaminetetraacetic acid, 80 parts of hydroxyethylene diphosphonic acid, 30 parts of tartaric acid, phytic acid 10 parts, stand and filter, the filtrate is returned to the phosphating processing tank, directly put into production, and the filter residue is recovered to be used as a raw material for the production of regenerative additives.

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Abstract

The invention discloses an environmentally-protective slag reducing agent of a phosphating solution. The agent contains ethylene diamine tetraacetic acid, hydroxy ethylidene diphosphonic acid, tartrate and phytic acid. The agent mainly uses a principle of a composite complexing agent, and can perform complexation for part heavy metal easy to produce slag in the phosphating solution, thereby obviously reducing the amount of slag during a regenerative process. The complexing agent also has an effect of improving corrosion resistance of metal phosphide films. When the phosphating solution is to be discarded or is discarded all ready, the agent is added in a proportion of 0.1 to 0.3 %, and sediment of the phosphating solution can be greatly reduced; and the quality of the newly transformed phosphating solution fully meet production demands.

Description

technical field [0001] The invention relates to the technical field of environmental protection additives, and relates to a slag reducing agent capable of converting scrap phosphating solution into new phosphating solution. Background technique [0002] With the rapid development of industrialization, phosphating solution is used more and more as an important metal surface pretreatment product, and the waste phosphating solution produced is increasing year by year. A large amount of sediment will be generated during the regeneration process of scrapped industrial phosphating solution, which makes it difficult to achieve solid-liquid separation, longer filtration time and low production efficiency. Contents of the invention [0003] The purpose of the present invention is to improve the effect of solid-liquid separation in the regeneration process of scrapped industrial phosphating solution. A slag reducer is invented, which can be added to the regeneration tank when regen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/86
Inventor 邓金玲
Owner DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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